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Switching Power Supply patents



      
           
This page is updated frequently with new Switching Power Supply-related patent applications. Subscribe to the Switching Power Supply RSS feed to automatically get the update: related Switching RSS feeds. RSS updates for this page: Switching Power Supply RSS RSS


Power supply system and image forming apparatus having the same

Switching power supply

Switching power supply apparatus and method of controlling switching power supply apparatus

Date/App# patent app List of recent Switching Power Supply-related patents
07/10/14
20140190453
 Method to detect partial failure of direct-injection boost voltage patent thumbnailMethod to detect partial failure of direct-injection boost voltage
A power supply diagnostic circuit includes a switching power supply that generates a voltage for powering a fuel injector. An injector control module selectively applies the voltage to the fuel injector and monitors a resultant electrical current flow through the fuel injector.
07/03/14
20140186066
 Power supply system and image forming apparatus having the same patent thumbnailPower supply system and image forming apparatus having the same
A power supply system includes: a switching power supply configured to rectify and smooth an ac voltage of an ac power supply to generate a predetermined dc voltage; a low-capacity power supply circuit that generates a zero-cross detection signal corresponding to zero-cross points of the ac power supply based on a rectified current flowing in a smoothing capacitor; and a controller configured to receive the zero-cross detection signal from the signal generating circuit and perform a determining process of determining whether it is possible to perform detection process of the zero-cross points based on a voltage value of the zero-cross detection signal. If the control unit determines that it is possible to perform the detection process of the zero-cross points, the control unit performs a zero-cross point detecting process of detecting the zero-cross points based on the zero-cross detection signal..
07/03/14
20140185340
 Switching power supply patent thumbnailSwitching power supply
In some aspects of the invention, a switching power supply can include a control circuit that conducts feedback control of a pulse width of a driving signal for switching the switching element according to an output voltage and settle the output voltage to a specified voltage level; a frequency reducing circuit that is disposed in the control circuit and reduces a frequency of the driving signal for switching the switching element upon detection of an overload state and limits an output current; and an initial state setting circuit that sets the control circuit to an overload detecting state for a predetermined period of time in a startup period of the control circuit. The initial state setting circuit can pull down a control voltage for a soft start signal for soft starting to the ground potential to inhibit generation of the driving signal and pulls up a feedback voltage signal..
07/03/14
20140185336
 Switching power supply apparatus and method of controlling switching power supply apparatus patent thumbnailSwitching power supply apparatus and method of controlling switching power supply apparatus
A switching power supply apparatus includes a transformer having a primary winding, a secondary winding, and an auxiliary winding, a switching element coupled in series to the primary winding; an output circuit section generating a voltage output from power transferred from the primary winding to the secondary winding in response to a switching operation of the switching element, a feedback signal generation circuit section configured to, during a secondary side conduction period in which an electric current flows through the secondary winding, generate a feedback signal having a signal level corrected based on a length of the secondary side conduction period, from an auxiliary winding voltage induced in the auxiliary winding, and a control circuit section driving the switching element based on the feedback signal.. .
07/03/14
20140185334
 Switching power supply patent thumbnailSwitching power supply
Aspects of the invention provide a switching power supply in which frequency reduction control in a light load condition both in a power factor correction converter and a dc-dc converter restrains energy loss and achieves optimum efficiency. A switching power supply can include a power factor correction converter and a dc-dc converter.
07/03/14
20140185332
 Switching power supply circuit patent thumbnailSwitching power supply circuit
A switching power supply circuit (101) includes a first rectifier circuit (102) converting an alternate current to a direct current, a switching operator (20), a switching transformer (103) including a primary coil supplied with a switched current and a secondary coil inducing power corresponding to the current, a second rectifier circuit (30) rectifying the power induced by the secondary coil, and a control circuit (40) changing a ratio of a current flowing to a photocoupler (107) to an output voltage from the second rectifier circuit (30) in a standby mode and in a power-on mode to reduce a noise of the switching transformer in each of the modes.. .
06/26/14
20140177286
 Quasi-resonant switching power supply patent thumbnailQuasi-resonant switching power supply
A quasi-resonance switching power supply quickly determines the number of bottom skips corresponding to the load condition even in abrupt load change. The quasi-resonance switching power supply is provided with a bottom skipping control function and a capacitor to hold a voltage corresponding to the load condition of the switching element over one switching period of the switching element.
06/19/14
20140169043
 Bias voltage generating circuit and switching power supply thereof patent thumbnailBias voltage generating circuit and switching power supply thereof
Disclosed herein are bias voltage generating circuits configured for switching power supplies, and associated control methods. In one embodiment, a bias voltage generating circuit can include: (i) a first control circuit configured to compare a drain-source voltage of a switch against a bias voltage; (ii) a capacitor, with the bias voltage across the capacitor; (iii) a second control circuit configured to control the switch, and that is enabled when the bias voltage is at least as high as an expected bias voltage; (iv) the first control circuit being configured to control the capacitor to charge when the drain-source voltage of the switch is greater than the bias voltage; and (v) the bias voltage being less than an overvoltage protection voltage when the capacitor charges, and where the overvoltage protection voltage comprises a voltage that is a predetermined amount higher than the expected bias voltage..
06/19/14
20140168567
 Light emitting apparatus patent thumbnailLight emitting apparatus
A current driving circuit is connected to an led terminal ledi, and generates an intermittent driving current iledi that corresponds to a dimming pulse signal pwmi. An error amplifier generates a feedback voltage vfb that corresponds to the difference between a detection voltage vledi and a predetermined reference voltage vref.
06/19/14
20140167724
 Self-powered source driving circuit and switching power supply thereof patent thumbnailSelf-powered source driving circuit and switching power supply thereof
In one embodiment, a source driving circuit configured for a switching power circuit, can include: (i) a source transistor coupled between a source of a main power transistor and ground, where the source transistor can be controlled by a pwm control signal; (ii) the main power transistor being on when the source transistor is on and a gate-source voltage of the main power transistor exceeds a conduction threshold voltage; (iii) a source diode having an anode coupled to the main power transistor source, and a cathode coupled to a delay circuit and a power supply capacitor; and (iv) the delay circuit controlling the main power transistor to turn off a delay time after the source transistor is turned off, where the delay time allows charging of the power supply capacitor such that a voltage across the power supply capacitor is at least a level of a reference voltage.. .
06/12/14
20140164803
Power management integrated circuit having a configurable total hibernate mode
A multi-tile power management integrated circuit (mtpmic) includes tiles including an mcu/adc tile and a power manager tile. The power manager tile includes a hibernate circuit and a set of configurable switching power supply pulse width modulator (cspspwm) components.
06/12/14
20140160814
Parallel-operating power supply system
Each of master and slave switching power supply apparatuses (2m, 2s) has an igbt (10m or 10s) switching-controlled by a pwn pulse signal produced, based on a clock signal, by a switching device driving pwm pulse output section (28m or 28s), to thereby provide dc power in parallel to a load (5). The clock signal produced in the master switching power supply apparatus (2m) is coupled to the slave switching power supply apparatus (2s) through a photocoupler (36m) in the master switching power supply apparatus (2m) and a photocoupler (38s) of the slave switching power supply apparatus (2s).
06/12/14
20140159694
Switching power supply device
A control circuit (24) includes a calculation means (28) which determines on time and off time of a main switching element (14) and a drive pulse generating means (30) which generates drive pulses that turn the main switching element (14) on and off. A control function formula which prescribes a relationship between an output voltage (vo) and an output differential value (vd) by a negative linear function and the like is defined in the calculation means (28).
06/05/14
20140152282
Switching power supply device and a semiconductor integrated circuit
In a switching power source which controls a current which flows in an inductor through a switching element which performs a switching operation in response to a pwm signal, and forms an output voltage by a capacitor which is provided in series in the inductor, a booster circuit which is constituted of a bootstrap capacity and a mosfet is provided between an output node of the switching element and a predetermined voltage terminal. The boosted voltage is used as an operational voltage of a driving circuit of the switching element, another source/drain region and a substrate gate are connected with each other, and a junction diode between one source/drain region and the substrate gate is inversely directed with respect to the boosted voltage which is formed by the bootstrap capacity..
06/05/14
20140152277
Switching power supply device
The present invention includes: an on-timer configured to control a period of time in which a main switching element is on; a voltage detecting circuit configured to detect an output voltage of a filter circuit; a triangular wave generator; a feed-forward circuit configured to generate a feed-forward output whose value decreases as a value of a dc voltage from a dc power supply increases; and a comparator configured to compare a second reference voltage generated by adding together a first reference voltage, a triangular wave signal from the triangular wave generator, and the feed-forward output from the feed-forward circuit, with the output voltage of the voltage detecting circuit, and based on a result of the comparison, output an on-trigger signal for turning on the main switch element to the on-timer.. .
05/29/14
20140146577
Switching power supply apparatus
A resonant capacitor and an inductor are connected in series between a primary winding of a transformer and a second switching element. A first rectifying and smoothing circuit including a first rectifier switching element and a capacitor rectifies and smoothes a voltage generated in a first secondary winding of the transformer, and takes out a first output voltage.
05/29/14
20140146238
Switching power supply device
A switching power supply device has a switching controller adapted to generate an output voltage from an input voltage by turning on and off a switching device by a non-linear control method according to a comparison signal and a timer signal, a main comparator adapted to generate the comparison signal by comparing a feedback voltage based on the output voltage with a predetermined reference voltage, a timer adapted to output the timer signal as a one-shot pulse when a predetermined fixed period elapses after the switching device is turned from on to off or vice versa, and a reverse current detector adapted to detect a reverse current to the switching device to forcibly turn off the switching device. The timer and the reverse current detector are turned on at a pulse edge in the comparison signal, and are turned off on ending their respective operation..
05/22/14
20140140103
Switching power supply
A switching power supply is provided including a transformer that transforms an ac voltage converted by a bridge circuit, and outputs the transformed voltage from a center tap between secondary coils, and two second switches that respectively cause both ends of the secondary coils to be brought in contact with and be separated from a fixed electrical potential. By the second switches being switched on/off, the switching power supply outputs the rectified dc voltage from the center tap.
05/22/14
20140139171
Range switching device
A range switching device provides a feedback control for rotating a motor toward a target rotation position. When a target shift range is switched, the range switching device rotates the motor toward a target rotation position by sequentially switching power supply phases of the motor based on an encoder count value.
05/15/14
20140133195
Control method and device for switching power supplies having more than one control mode
A control device for controlling a switching power supply adapted to convert an input voltage into an output voltage according to a switching rate of a switching element. The control device includes first control means for switching the switching element in a first working mode at a constant frequency and second control means for switching the switching element in a second working mode at a variable frequency, under a maximum frequency, in response to the detection of a predefined operative condition of the switching power supply.
05/15/14
20140133188
Snubber circuit
A snubber circuit of a switching power supply device includes a transistor and a capacitor which are connected in series between a cathode and an anode of a diode, and a secondary winding of a transformer. A vibration voltage is generated in the secondary winding when a surge voltage is generated in the diode.
05/15/14
20140132384
Wirewound inductor of switching power supply and switching power supply with the wirewound inductor
The present invention provides a wirewound inductor of a switching power supply and a switching power supply with the wirewound inductor. The wirewound inductor comprises a magnetic core and a winding wound on the magnetic core.
05/08/14
20140125266
Power management multi-chip module with separate high-side driver integrated circuit die
A packaged device includes a first die, a second die, and specially spaced and positioned sets of package terminals. The first die includes a pulse-width modulator (pwm), a processor, a timer, high-side drivers, low-side drivers, and a fault protection circuit.
05/01/14
20140121939
Boost power supply sequencing
A boost power supply may be constructed of a number of smaller switching power supplies, each switching power supply providing a respective portion of a combined output current provided by the boost power supply to a load. A different respective control signal may be provided to each switching power supply to regulate the respective portion of the combined output current provided by the switching power supply.
05/01/14
20140119062
Switching power supply
A switching power supply determines the order n (a natural number) of the power supply higher harmonic component near the receiving frequency fc of an am radio broadcast, and judges whether the higher harmonic component of the order n is higher or lower than the receiving frequency fc of the am radio broadcast. According to the judgment result, the switching power supply determines an upper limit value and a lower limit value for the power supply frequency fs that does not interfere with the receiving frequency fc of the am radio broadcast from the values of the fundamental power supply frequency fso of the switching operation, the order n of the higher harmonic component, the receiving frequency fc of the am radio broadcast, and the bandwidth bw of the receiving frequency.
04/24/14
20140112043
Switching power supply apparatus
A switching power supply apparatus which receives ac voltage and includes: a transformer including a primary winding and a secondary winding; a first bidirectional switch connected in series with the primary winding; and a snubber circuit connected in parallel with the primary winding. The ac voltage is applied to a series circuit which includes the primary winding and the first bidirectional switch.
04/24/14
20140112031
Control and drive circuit and method
Disclosed herein are control and drive circuits and methods for synchronous rectification switching power supply bias voltage generating circuits configured for a switching power supply. In one embodiment, a control and drive circuit can include: (i) a primary side switch controller configured to generate a primary side switch control signal; (ii) a logic circuit configured to generate a first control signal based on the primary side switch control signal; (iii) a converting circuit configured to generate a second control signal based on the first control signal; and (iv) a synchronous rectifier switch controller configured to generate a synchronous rectifier switch control signal based on the second control signal such that phases of the primary side switch control signal and the synchronous rectifier switch control signal are the same or inverse based on a topology of the synchronous rectification switching power supply..
04/17/14
20140107856
Adjustable shunt regulated & switching power supply for loop powered transmitter
A loop powered process instrument comprises a control system measuring a process variable and developing a measurement signal representing the process variable. An output circuit, for connection to a remote power source using a two-wire process loop, controls current on the loop in accordance with the measurement signal.
04/17/14
20140104894
Switching power supply system
A control circuit controlling the driving of a switching device includes an under voltage limiting operation circuit stopping the operation of the control circuit when a power supply voltage supplied from the auxiliary winding of an insulating transformer becomes lower than a predetermined power supply lower limit voltage, an fb voltage decision circuit stopping the driving of the switching device when a feedback voltage indicating the state of a load becomes lower than the predetermined threshold value, a flip-flop brought into a set state by an output of the fb voltage decision circuit and a reset state when the power supply voltage exceeds the voltage ensuring the normal operation of the control circuit, and a switching circuit to set the power supply lower limit voltage in the under voltage limiting operation circuit, lower than that of the normal operation when the flip-flop is set.. .
04/17/14
20140103895
Compensation circuit and switching power supply thereof
Disclosed are compensation circuits for a switching power supply. In one embodiment, a compensation circuit can include: (i) a transconductance amplifier configured to receive a reference signal and a feedback signal, and to generate an amplifier output signal according to a difference between the reference signal and the feedback signal; (ii) a switching circuit configured to receive the amplifier output signal, where the switching circuit is controllable by a control signal from a switch control circuit; and (iii) a charging circuit coupled to the switching circuit, where the charging circuit is configured to be charged by the amplifier output signal in response to the control signal, and to generate a compensation signal therefrom..
04/17/14
20140103736
Signal transmission device and switching power supply
A signal transmission device of aspects of the invention can include a master circuit connected to the primary sides of first and second transformers and a slave circuit connected to the secondary sides of the first and second transformers. The master circuit sets one of first and second transmitting/receiving circuits for transmitting operation and the other for receiving operation according to a control signal, and detecting a leading edge and a falling edge of the control signal, transmits a pulse signal with the pulse interval changing after a predetermined period of time.
04/10/14
20140099139
Switching power supply and image forming apparatus equipped with switching power supply
A power supply device including a transformer having a primary winding and a secondary winding, and a switching element connected to the primary winding configured to drive the switching element to output voltage from the secondary winding includes a control unit configured to drive the switching element such that the switching element is turned on and, in which, in a case where the control unit performs an intermittent drive operation which repeats a period for which the switching element is driven and a period for which the drive of the switching element is stopped, in which the control unit drives the switching element such that the switching element is turned off before the voltage according to the current flowing to the primary winding reaches the voltage output from the secondary winding in the period for which the switching element is driven.. .
04/10/14
20140098574
Switching power supply device
A switching power supply includes a series resonant circuit that includes a resonant inductor and a resonant capacitor connected in series with a primary winding of a converter transformer. By controlling turning on and off of first and second switching elements in a complementary manner, current is supplied to the series resonant circuit.
04/10/14
20140097881
Balanced auxiliary on time generator for multiphase stackable constant on time control architecture
A control circuit configured to control a switching power supply including a ramp generator configured to generate a triangular waveform. A comparator is configured to generate a series of pulse width modulated (pwm) pulses at a first frequency and to regulate the switching power supply.
04/03/14
20140092644
Switching power supply device and method for circuit design of the switching power supply device
A switching power supply device includes a rectifying circuit configured to rectify an ac voltage and to output a rectified voltage, a smoothing capacitor configured to smooth the rectified voltage and to output a smoothed voltage, a first dc-dc converter configured to convert the smoothed voltage into an intermediate voltage and to output the intermediate voltage, and a second dc-dc converter configured to convert the intermediate voltage into an output voltage and to output the output voltage substantially free of ripple. The first dc-dc converter is configured to perform a step-up operation, a step-up/down operation, and a step-down operation according to the smoothed voltage, and to output the intermediate voltage including a ripple or the intermediate voltage substantially free of ripple..
04/03/14
20140091890
Switching power supply
In an electrical energy generator, at least one permanent magnet generates flux and a magnetizable member forms the single flux path. An electrically conductive coil is wound around the magnetizable member, and a plurality of flux switches are operative to sequentially reverse the flux from the magnet through the member, thereby inducing electrical current in the coil.
04/03/14
20140090530
Power tool with circuit for sensing contact between an implement and an object
A power tool includes a sensing circuit mounted on a printed circuit card is electrically connected to a switching power supply that supplies electrical power to the sensing circuit. The sensing circuit is not connected to earth ground to enable detection of an operator approaching a moving implement without the operator necessarily being electrically connected to earth ground..
03/27/14
20140085949
Switching power supply
A switching power supply that conducts switching of an input voltage by a switching element to obtain a specified output voltage includes: an on width controlling component that controls an on width of the switching element; a zero current detecting component that detects zero current through the switching element to turn on the switching element; a frequency reducing component that delays a turn on timing of the switching element upon detection of a light load condition by a load condition detecting component to reduce a switching frequency of the switching element; and an ac period detecting component that detects a period of the input voltage to hold the load condition detected by the load condition detecting component over every period detected by the ac period detecting component.. .
03/27/14
20140084791
Power supply apparatus and luminaire
A power supply apparatus of an embodiment includes a first filter, a second filter, and a switching power supply. The first filter and the second filter attenuate a common mode current to a level lower than a normal mode current.
03/20/14
20140078794
Switching power source device
A switching power source device includes a switching power supply main body switching an input voltage via a switching element to obtain a predetermined dc output voltage, a control circuit performing on/off-driving of the switching element; and a capacitor connected to the control circuit to be charged by an external power supply via an activation switch circuit during activation and charged by a voltage generated in the switching power supply main body after completion of activation to supply a control power voltage to the control circuit. The control circuit further includes a latch circuit set according to a latch signal emitted when an abnormality is detected, to stop the driving of the switching element, a discharge circuit receiving the latch signal to be turned on and discharging charges accumulated in the capacitor, and a comparator resetting the latch circuit when the control power voltage decreases to an operation stop voltage..
03/20/14
20140078788
Synchronous rectifying control method and circuit for isolated switching power supply
Disclosed are synchronous rectifying control methods and circuits for an isolated switching power supply. In one embodiment, a method can include: (i) generating a ramp voltage based on a power terminal voltage, where the power terminal voltage includes a voltage between first and second power terminals of a synchronous rectifier in the isolated switching power supply; (ii) determining whether the power terminal voltage starts declining; (iii) comparing the ramp voltage to a threshold voltage when the power terminal voltage starts to decline, where the threshold voltage substantially matches a minimum conduction time of the synchronous rectifier; (iv) reducing the ramp voltage and controlling the synchronous rectifier in an off state when the ramp voltage is lower than the threshold voltage; and (v) reducing the ramp voltage and controlling the synchronous rectifier in on state when the ramp voltage is higher than the threshold voltage..
03/20/14
20140078784
Switching power supply
A switching power supply can reduce conduction noise when frequency spread control is conducted simultaneously with switching frequency reducing control. The switching power supply comprises a frequency controller that controls the switching frequency of the switching element corresponding to a load condition and reduces the switching frequency in a light load period, a frequency spread modulator that modulates the switching frequency with a predetermined frequency spread width, and a frequency skipping controller that controls the frequency controller to skip a fundamental frequency of the switching frequency when the fundamental frequency becomes a predetermined threshold frequency..
03/20/14
20140077867
Bias voltage generating circuit and switching power supply thereof
Disclosed herein are bias voltage generating circuits configured for switching power supplies, and associated control methods. In one embodiment, a bias voltage generating circuit can include: (i) a first control circuit configured to compare a drain-source voltage of a switch against a bias voltage; (ii) a capacitor, with the bias voltage across the capacitor; (iii) a second control circuit configured to control the switch, and that is enabled when the bias voltage is at least as high as an expected bias voltage; (iv) the first control circuit being configured to control the capacitor to charge when the drain-source voltage of the switch is greater than the bias voltage; and (v) the bias voltage being less than an overvoltage protection voltage when the capacitor charges, and where the overvoltage protection voltage comprises a voltage that is a predetermined amount higher than the expected bias voltage..
03/20/14
20140077790
Switching power supply device
A switching power supply device includes a first control circuit that turns a first switch on when first and second switches are off and a voltage at a junction node therebetween is increased to decrease a voltage across the first switch to a first threshold voltage, turns off when a first on-period has elapsed from when the first switch is turned on, and lengthens the first on-period as an output voltage decreases relative to a reference voltage; and a second control circuit that turns the second switch on when both switches are off and a voltage across the second switch is decreased to a second threshold voltage, turns off when a reverse current flows through the inductor, sufficient to increase the voltage at the junction node to decrease the voltage across the first switch to the first threshold voltage after the second switch is turned off.. .
03/20/14
20140077714
Driving device, light-emitting device and projector
A driving device includes a switching power supply circuit to convert input power to output power; a first switching element which opens and closes a circuit of a load; an output capacitor connected in parallel to the load and the first switching element; a selection switch disposed between the inductor and the output capacitor, the selection switch switching between a first selection state where the load is electrically connected to the inductor and the second selection state where a reference potential portion is electrically connected to the inductor; a timing controller which operates the switching power supply circuit while the first switching element is closed; and a controller which puts the selection switch into the second selection state before the first switching element is closed.. .
03/20/14
20140077713
Luminaire
A luminaire according to one embodiment includes a dc power supply circuit, a switching power supply, and a lighting load. The dc power supply circuit converts an ac voltage controlled in phase to a dc voltage.
03/13/14
20140071724
Bridge-less step-up switching power supply device
A bridge-less step-up switching power supply device includes (i) a first and a second reactor having: a first and a second main winding connected to a first and a second input terminal, respectively; and a first and a second auxiliary winding magnetically coupled to the first main winding and connected to the first and second main windings, the first and second auxiliary windings having a first and a second leakage inductance, respectively; (ii) a first and a second diode connected between the first and second auxiliary windings and a first output terminal, respectively; (iii) a first capacitor connected between the first output terminal and a second output terminal; (iv) a second capacitor connected between a connection point of a third switch and a fourth switch, and the first output terminal; and (v) a controller for controlling turning on/off of first to fourth switches.. .
03/13/14
20140071717
Switching power supply apparatus and semiconductor device
A switching power supply apparatus includes: an input terminal; an output terminal; a switching element; an input and output converting unit which converts input voltage applied through the switching element into output voltage to supply output power to a load; an output voltage feedback unit which outputs a feedback signal, based on the output voltage; a switch current detecting unit which detects current flowing through the switching element; an oscillating frequency setting unit which sets the switching frequency of the switching element, based on the feedback signal; a peak current setting unit which controls turn-off of the switching element by setting a current threshold such that a switch current peak (i) is constant regardless of a change in the output power and (ii) increases as the input voltage increases; and a switching control unit which controls switching operation of the switching element.. .
03/13/14
20140070385
Flip-chip package structure and method for an integrated switching power supply
Disclosed are flip-chip package structures and methods for an integrated switching power supply. In one embodiment, a flip-chip package structure can include: (i) a die with an integrated switching power supply, where a first surface of the die includes first bumps with different polarities; (ii) a redistribution layer including redistribution layer units, each having a first surface to connect bumps with a same polarity from the first bumps, the redistribution layer having a second surface including second bumps to redistribute polarities; (iii) a lead frame having pins, where a first surface of the lead frame can connect bumps with a same polarity from the second bumps; and (iv) a flip-chip package configured to package the die, the redistribution layer, the first and second bumps, and the lead frame, where a second surface of the lead frame provides electrical connectivity between the integrated switching power supply and a pcb..
03/06/14
20140063861
Ac-dc voltage converter with low standby power consumption and control method thereof
Disclosed are ac-dc voltage converter circuits and methods for low standby power consumption. In one embodiment, a method can include: (i) detecting operating states of an input power supply, where the input power supply is received by a safety capacitor and provided to a switching power supply circuit after being rectified and filtered; (ii) removing a phantom load when the input power supply operates in a normal operating state; (iii) loading the phantom load when the input power supply operates in an under voltage lock out state; and (iv) when the input power supply operates in the under voltage lock out state, using energy stored in the safety capacitor to supply power to a load of the switching power supply circuit and the phantom load, and disabling a power stage circuit until a voltage of the safety capacitor is reduced to less than a safety threshold value..
03/06/14
20140062439
Switching power supply
A switching power supply comprises a noise detecting circuit and a canceling signal generating circuit. The noise detecting circuit detects gnd bounce noise developing on a ground line of the control circuit accompanying switching operation of a switching element.
02/27/14
20140056047
High-efficiency bias voltage generating circuit
Disclosed are bias voltage generating circuits and methods for a switching power supply. In one embodiment, a switching power supply can include: (i) a driver circuit configured to receive a bias voltage, and to drive a switch in a power stage of the switching power supply; (ii) where a ratio of an output voltage of the switching power supply to an expected bias voltage of the driver circuit is configured as a proportionality coefficient; (iii) a bias voltage generating circuit configured to generate the bias voltage for the driver circuit based on a first voltage; and (iv) an h-shaped inductor coupled to an input of the bias voltage generating circuit, where the first voltage is configured to be generated based on a number of turns of the h-shaped inductor and the proportionality coefficient..
02/27/14
20140055168
Source-electrode driving control circuit and control method thereof
Disclosed are driving control methods and circuits for quasi-resonant control of a main power switch of a switching power supply. In one embodiment, a driving control circuit can include: (i) a clamp circuit coupled to a gate of the main power switch, where the clamp circuit is configured to clamp a voltage of the gate to a clamping voltage that is greater than a threshold voltage of the main power switch; (ii) a valley voltage detection circuit configured to activate a valley control signal when a drain-source voltage of the main power switch is at a resonance valley level; and (iii) a source voltage control circuit configured to reduce a voltage of a source of the main power switch to turn on the main power switch in response to the valley control signal being activated..
02/20/14
20140049992
Switching power supply
A switching power supply is suitable for transforming ac input voltage to dc output voltage. The switching power supply includes a transformer, a power circuit, an output circuit, a switching element, a control element, a shielding element and a metal element.
02/20/14
20140049241
Dimming control for a switching power supply
An example controller includes a measurement block and a drive block. The measurement block determines an amount of time that a dimmer circuit, that is coupled to an input of a power supply, disconnects an ac input voltage.
02/20/14
20140049237
Switching power supply device and electronic appliance therewith
Provided is a switching power source device in which fluctuation of the switching frequency can be suppressed without impairing the advantages of a non-linear control system. A switching power source device is provided with: switching control units of non-linear control type that generate an output voltage (out) from an input voltage (in) by performing on/off control of switching elements in accordance with the results of comparing a feedback voltage (fb) and reference voltage (ref); and an on time setting unit that monitors switching voltage (sw) appearing at one end of the switch terminals, and sets the on time (ton) of the switching element in the switching control units based on the duty of the switching voltage (sw)..
02/13/14
20140043868
Switching power supply system and control circuit of the switching power supply system
A switching power supply system includes a transformer having a primary winding, a secondary winding and a tertiary winding, a switching device inputted to the primary winding carrying out switching operation on the basis of a first control signal or a second control signal, an output voltage producing section rectifying and smoothing a voltage generated in the secondary winding to produce an output voltage, an output voltage detecting section producing an output voltage detection signal based on a voltage generated in the tertiary winding, a checking pulse generator generating pulses of the first control signal, and a switching controlling section producing the second control signal on the basis of the output voltage detection signal. The switching power supply system is capable of carrying out stable control of the output voltage on the secondary winding side of the transformer with a low power loss..
02/13/14
20140043867
Switching power supply device control circuit and switching power supply
A switching power supply device control circuit and switching power supply can combat fluctuation due to the input voltage in the peak current of a switching element, even when using an oscillator. A control ic is connected to a switching element and to a current detecting resistor, and controls the switching element, the control ic being configured of an ocp comparator that detects an overcurrent with respect to a load, an overcurrent level setting circuit that corrects a fluctuation occurring in the peak current of the switching element in response to the output voltage from the ac input, an oscillator having a frequency modulating function whereby the switching frequency with respect to the switching element can be modulated, and a slope compensation circuit that generates a slope compensation signal increasing monotonically in proportion to the time from the start of each cycle of an oscillating signal of the oscillator..
02/06/14
20140036552
Semiconductor device provided with switching power supply device with intermittent oscillation control
A control circuit varies an intermittent oscillation frequency using a period signal. A period signal period signal frequency is set to a frequency lower than the intermittent oscillation frequency, or is set to be higher than the intermittent oscillation frequency and to a frequency other than integer multiples of the intermittent oscillation frequency.
02/06/14
20140035543
Phase doubling for switching power supply
A switching power supply control system may include logic to generate a greater number of second switching control signals in response to a first number of original switching control signals. For example, the logic may increase the number of phases that may be controlled by an existing switching power supply controller.
02/06/14
20140035542
Non-linear pwm controller
A switching power supply includes a circuit having at least two reactive components to provide an output voltage and capable of being switched from a first output state to a second output state. A switching component switches the circuit between at least two switching states including the first output state and the second output state.
01/23/14
20140023126
Universal network interface device
An universal network interface device with an enclosure, an access module, a modem module, a switching power supply and a battery pack.. .
01/16/14
20140016365
Control circut of a quasi-resonance switching power supply
Aspects of the provide a control circuit of a quasi-resonant switching power supply in which the switching frequency can be adequately reduced under a light load condition. Some aspects include a control circuit of a quasi-resonant switching power supply that performs switching operation of a switching element based on a bottom detection signal.
01/16/14
20140016364
Switching power supply device
In some aspects of the invention, a load state detecting circuit is configured so that a threshold voltage for determining the size of a load of a dc-dc converter is set in the load state detecting circuit based on a maximum value of an output voltage of a power factor correction converter in an operation-stopped state of the power factor correction converter, so that the load state detecting circuit outputs an operation-enable signal when a feedback voltage indicating the size of the load of the dc-dc converter exceeds the threshold voltage. Thus, by way of some aspects of the invention, it is possible to provide a switching power supply device which can control enabling and stopping operation of a power factor correction converter reliably in accordance with a load state of a dc-dc converter obtaining a predetermined dc output voltage by switching an output voltage of the correction converter..
01/16/14
20140016363
Switching power supply
Aspects of the invention provide a switching power supply that exhibits an improved conversion efficiency. In aspects of the invention, a load condition detecting circuit sets a threshold voltage for determining the magnitude of the load on the dc-dc converter based on the maximum value of the output voltage of the power factor correction converter in a suspended period of the power factor correction converter.
01/09/14
20140008981
Switching power supply apparatus
In a switching power supply apparatus, a main switching control circuit performs switching control of a low-side switch device and a high-side switch device based on a feedback signal corresponding to a main output voltage output from a secondary winding of a transformer, and applies and stops applying a voltage to a primary winding of the transformer. A digital signal processor, in accordance with the load status of the main load, changes set target values, performs switching control of switch devices of the sub-rectifying and smoothing circuits, and drives sub-loads..
01/09/14
20140008968
Apparatuses and methods for supplying electrical power to an electrocrushing drill
Methods and apparatuses for directly charging capacitors in a down-hole pulsed power system used for electrocrushing drilling. An above ground power supply is directly connected to the capacitors.
01/02/14
20140001344
Switched mode night vision device power supply
A night vision device with a switching power supply and a method of powering a night vision device with switching circuits are provided. The switching power supply converts a battery voltage to high dc voltages for powering photocathode, screen, and mcp of the night vision device.
12/26/13
20130343097
Switching power supply
A switching power supply achieves simultaneously achieves suppression of surge voltage and satisfactory transient response. The switching power supply comprises a switching element connected to a primary winding of an isolation transformer, a resonance capacitor connected to the switching element, an output capacitor connected to a secondary winding of the isolation transformer through a rectifying diode, and a control circuit on/off driving the switching element.
12/19/13
20130336020
Method and apparatus to reduce audio frequencies in a switching power supply
An example power supply regulator includes an energy transfer element, a switch, and a controller. The controller includes a switch signal generator, a modulation circuit, and a multi-cycle modulator circuit.
12/19/13
20130335862
Overvoltage protection system for power system with multiple parallel-connected switching power supplies
An ovp system which includes a plurality of ovp circuits coupled to respective parallel-connected switching power supplies. Each ovp circuit comprises a bus voltage overvoltage detection circuit having a first output which toggles when the voltage on the common power bus exceeds a reference voltage, a modulation flag detection circuit which receives a value that varies with a parameter associated with the pwm or pfm drive signals generated for the switching power supply to which the ovp circuit is coupled and has a second output which toggles when the parameter value exceeds a reference parameter value, logic circuitry which toggles an output when both the first and second outputs toggle, and an overvoltage response circuit which initiates a course of action such as latching or shutting down the switching power supply to which the ovp circuit is coupled when the logic circuitry's output toggles..


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Switching Power Supply topics: Switching Power Supply, Duty Cycle, Feedback Signal, Semiconductor Switch, Semiconductor, Sound Transducer, Transducer, Imaging System, Ultrasound, Data Acquisition, High Speed, Electronic Device, Current Loop, Switched Mode Power Supply, Reference Voltage

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