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Pulse Width Modulation patents



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


Power converter control circuit

Thermal stress reduction in aircraft motor controllers

Motor controller

Date/App# patent app List of recent Pulse Width Modulation-related patents
09/11/14
20140257607
 Transmission oil pressure control during engine autostart patent thumbnailTransmission oil pressure control during engine autostart
A vehicle includes an engine having autostart functionality, a source of fluid pressure when the engine is off, a flow control solenoid that outputs a variable clutch pressure, a transmission, an electric motor, and a controller. The transmission includes a clutch in fluid communication with the solenoid.
09/11/14
20140253084
 Power converter control circuit patent thumbnailPower converter control circuit
A power converter control circuit includes a feedback circuit and a pulse width modulation signal generating circuit for configuring a power stage circuit to provide power to a load. The feedback circuit generates a first gain signal and a second gain signal according to an output voltage sensing signal coupled with the load.
09/11/14
20140253005
 Thermal stress reduction in aircraft motor controllers patent thumbnailThermal stress reduction in aircraft motor controllers
A thermal stress reduction method includes ramping an electric power generator to start an aircraft engine, for a time period associated with the aircraft engine start sequence toggling a three-level inverter switch array to a three-level pulse width modulation mode, determining if a first time interval in the three-level pulse width modulation mode exceeded a predetermined three-level pulse width modulation mode interval, in response to the first time interval exceeding the three-level pulse width modulation mode interval, toggling the three-level inverter switch array to a two-level pulse width modulation mode, determining if a second time interval in the two-level pulse width modulation mode exceeded a predetermined two-level pulse width modulation mode interval and in response to the second time interval exceeding the two-level pulse width modulation mode interval, toggling the three-level inverter switch array to the three-level pulse width modulation mode.. .
09/11/14
20140252995
 Motor controller patent thumbnailMotor controller
The present invention provides a motor controller for controlling a dc motor according to a reference signal. The motor controller includes a compensator, a pulse width modulation unit, and a motor driving unit.
09/11/14
20140252966
 Current split circuit for equally splitting current between parallel connected led luminaire strings patent thumbnailCurrent split circuit for equally splitting current between parallel connected led luminaire strings
A system and method for equally splitting the current supplied to parallel connected strings of leds. The system and method includes a current splitting circuit such as a mirror circuit that divides the current substantially equally between two or more parallel connected strings of leds.
09/11/14
20140250910
 Thermal stress reduction in aircraft motor controllers patent thumbnailThermal stress reduction in aircraft motor controllers
A thermal stress reduction method includes ramping an electric power generator to start an aircraft engine, for a time period associated with the aircraft engine start sequence toggling a three-level inverter switch array to a three-level pulse width modulation mode, determining if a first time interval in the three-level pulse width modulation mode exceeded a predetermined three-level pulse width modulation mode interval, in response to the first time interval exceeding the three-level pulse width modulation mode interval, toggling the three-level inverter switch array to a two-level pulse width modulation mode, determining if a second time interval in the two-level pulse width modulation mode exceeded a predetermined two-level pulse width modulation mode interval and in response to the second time interval exceeding the two-level pulse width modulation mode interval, toggling the three-level inverter switch array to the three-level pulse width modulation mode.. .
09/04/14
20140247627
 Converter and method patent thumbnailConverter and method
In accordance with an embodiment, a method for controlling a circuit includes controlling pulse width modulation on a primary side of a quasi-resonant controller to achieve continuous current mode operation from a synchronous rectification controller on a secondary side.. .
09/04/14
20140246990
 Lighting device and lighting control method patent thumbnailLighting device and lighting control method
A lighting device may be provided that includes: a first to a fourth light emitting devices which are disposed on a substrate a first and a second pulse width modulation controllers which perform a pulse width modulation on currents applied to the first and the second light emitting devices respectively; and a first and a second controllers which control respectively currents applied to the third and the fourth light emitting devices having color temperatures different from those of the first and the second light emitting devices, wherein an (x, y) coordinate, which is determined by the mixture of the lights emitted from the first to the fourth light emitting devices and is located within a 1931 cie chromaticity diagram, is moved onto a black body radiation curve within the 1931 cie chromaticity diagram through the pulse width modulation of the first and the second pulse width modulation controllers and the control of the first and the second controllers.. .
08/28/14
20140240380
 Driving device, display device including the driving device, and driving method of the display device patent thumbnailDriving device, display device including the driving device, and driving method of the display device
A driving device includes a memory configured to store an initial setting value to drive a display, a power source controller configured to output a pulse width modulation (pwm) signal controlling power applied to the display, and a switching unit configured to connect an input and output port to the memory when writing data to a memory and configured to connect the power source controller to the input and output port when driving the display.. .
08/28/14
20140240020
 Configurable time delays for equalizing pulse width modulation timing patent thumbnailConfigurable time delays for equalizing pulse width modulation timing
A plurality of pwm generators have user configurable time delay circuits for each pwm control signal generated therefrom. The time delay circuits are adjusted so that each of the pwm control signals arrive at their associated power transistors at the same time.
08/28/14
20140239850
Backlight dimming circuit, dimming method of the same and liquid crystal display thereof
The present invention provides a backlight dimming circuit, a dimming method of the same and a liquid crystal display thereof. The backlight dimming circuit comprises a power supply voltage terminal vcc, which is used to provide supply voltage; an operational amplifier q, the noninverting input terminal of which connected with the power supply voltage terminal vcc, and the inverting input terminal of which connected with a load terminal; a precision resistor r, which is connected between the noninverting input terminal and the inverting input terminal of the operational amplifier q, the voltage differential signal across the precision resistor r being converted and amplified to a dc voltage signal by the operational amplifier q and outputting; and a comparator c, the noninverting input terminal of which receiving the dc voltage signal output from the operational amplifier q, and the inverting input terminal of which receiving a sawtooth signal from a boost ic in a boost converter, which is used to compare the dc voltage signal with the sawtooth signal of the boost ic and then outputting a pulse width modulation dimming signal according the comparison results.
08/28/14
20140238054
Multiple evaporator control using pwm valve/compressor
A refrigeration system including a condenser; a (single) linear compressor that is activated and deactivated by a pulse width modulation switching device; a pulse width modulation refrigerant flow switch; at least two evaporators operably connected in parallel with one another with at least one evaporator associated with the refrigerator compartment that operates at a first refrigerant fluid pressure and with at least one other evaporator associated with the freezer compartment that operates at a second refrigerant fluid pressure; and a plurality of refrigerant fluid conduits operably connecting the condenser, the linear compressor and the evaporators into a refrigerant fluid flow circuit and such that the evaporators are capable of running simultaneously at different pressure levels and refrigerant flows from the evaporators, to the pulse width modulation refrigerant flow switch and through the pulse width modulation refrigerant flow switch.. .
08/21/14
20140232367
Switching regulator control method
A control method for preventing an output voltage of a buck switching regulator from falling when an input voltage of the buck switching regulator falls includes: converting the input voltage into a charging current; determining a duty cycle of the buck switching regulator according to the charging current and the output voltage; and adjusting a switching frequency of a pulse width modulation signal in the buck switching regulator when the input voltage falls to a specific voltage and an off time of the pulse width modulation signal reaches a minimum value, in order to change the duty cycle to prevent the output voltage from falling.. .
08/14/14
20140229755
Pulse width modulation load share bus
Power supply modules have outputs coupled in parallel and convey load share balancing information over a single wire load share bus. Pulse width modulation (pwm) signals represent output loading of each of the power supply modules over the single wire load share bus.
08/14/14
20140226709
Method for generating a digital signal
A method is provided for generating a digital signal (ds) from an analog signal (ia, ua) generated by a frequency converter on the basis of pulse width modulation, wherein the digital signal corresponds to a mean value of the analog signal over a period of the pulse width modulation. The method includes the acts of: generating a bit stream (bs(i)) with a predetermined bit repetition duration (bw) depending on the analog signal by way of a sigma-delta modulator (1) and, during a time interval which has a duration which is at least as great as the period of the pulse width modulation: multiplying a respective bit (bs(i)) of the bit stream by a corresponding rating coefficient (bk(i)) for generating a respective bit/rating coefficient product and summing the respective bit/rating coefficient products, wherein the sum represents the digital signal..
08/14/14
20140226379
Method and apparatus for chaotic democratic pulse width modulation generation
An apparatus, method and system for operating a power converter of a plurality of serially connected power converters coupled using chaotic democratic control includes: a dc voltage module generating a set current value for the power converter to bias a dc source at a set point voltage and a switching controller. The switching controller determining an upper threshold and lower threshold based on the set current value, and comparing a system current value to the upper and lower thresholds to determine an operating state of the power converter, where the system current is generated by the plurality of converters..
08/14/14
20140225584
Switching power supply circuit
A switching power supply circuit is disclosed in an embodiment. The switching power supply circuit includes a power output stage, a pulse width modulation (pwm) signal generator, a compensation module, and a overshooting protection module.
08/07/14
20140218990
Power factor correction device and correcting method thereof
A power factor correction device comprises a power stage circuit converting input alternating current voltage into input current according to a pulse width modulation signal and outputs the input current to a load generating output voltage on the load, and sampling the input current outputting a correcting current; a current compensating circuit receiving and comparing the correcting current with a reference current signal generating a compensating current signal; a voltage compensating circuit receiving and comparing the output voltage with a reference voltage generating a compensating voltage signal; a multiplication amplifier receiving the compensating current signal and the compensating voltage signal generating an updated reference current signal by multiplying the compensating current signal with the compensating voltage signal; and a pulse width modulation converter receiving the compensating current signal and the compensating voltage signal generating the pulse width modulation signal to synchronize phase of alternating current voltage and input current.. .
08/07/14
20140218975
Power conversion system with adjustable frequency
A power conversion system with adjustable frequency includes an electric transformer, a pulse width modulation driving controller, a switching transistor, a first and second voltage division resistors connected in series, an output diode and an output capacitor. The electric transformer receives the input power and generates the sensing current and induced current.
08/07/14
20140218125
Digital pulse width modulation controller
A digital pulse width modulation controller includes a pulse width modulation controller, a selection unit having at least one selector, a comparison unit having at least one comparator, and a signal conversion unit having at least one digital-to-analog converter. The digital-to-analog converter generates a reference current and/or voltage.
08/07/14
20140218002
Power system and control method thereof
The present invention provides a power system and controlling method thereof. The power system includes: pulse width modulation (pwm) power source, voltage detection unit, current detection unit and feedback signal generation unit.
08/07/14
20140218000
Voltage regulator circuit
A voltage regulator circuit includes a soft start module, a pulse width modulation (pwm) module, and a voltage regulator module. The soft start module is used to receive a current feedback voltage corresponding to an input current, and compare the current feedback voltage with a comparison voltage, so as to output a switching signal.
08/07/14
20140217939
Apparatus and method of decreasing speed of sensorless brush less direct current (bldc) motor
Disclosed herein is an apparatus of a sensorless brush less direct current (bldc) motor capable of rapidly driving the bldc motor at a decreased speed. The apparatus includes: a switching unit configured to switch a direct current (dc) power depending on a plurality of pulse width modulation (pwm) signals to generate a three-phase alternating current (ac) power and apply the generated three-phase ac power to the bldc motor to drive the bdlc motor; a plurality of voltage dividers configured to divide voltages of reverse electromotive forces generated in the bldc motor; and a controlling unit configured to calculate a current rotation speed of the bldc motor using output signals of the plurality of voltage dividers, generate the plurality of pwm signals depending on the calculated current rotation speed and a command rotation speed and output the plurality of pwm signals to the switching unit, divide a rotation phase angle of the bldc motor into a speed decreasing region and a zero crossing point (zcp) detecting region in the case of decreasing a rotation speed of the bldc motor, decrease the rotation speed of the bldc motor in the case in which the rotation phase angle of the bldc motor is in the speed decreasing region, and detect zcps of the reverse electromotive forces in the case in which the rotation phase angle of the bldc motor is in the zcp detecting region.
08/07/14
20140216346
Plasma processing apparatus
A plasma processing apparatus includes a processing chamber including a dielectric window; a coil-shaped rf antenna, provided outside the dielectric window; a substrate supporting unit provided in the processing chamber; a processing gas supply unit; an rf power supply unit for supplying an rf power to the rf antenna to generate a plasma of the processing gas by an inductive coupling in the processing chamber, the rf power having an appropriate frequency for rf discharge of the processing gas; a correction coil, provided at a position outside the processing chamber where the correction coil is to be coupled with the rf antenna by an electromagnetic induction, for controlling a plasma density distribution on the substrate in the processing chamber; a switching device provided in a loop of the correction coil; and a switching control unit for on-off controlling the switching device at a desired duty ratio by pulse width modulation.. .
08/07/14
20140216345
Plasma processing apparatus
A plasma processing apparatus includes a processing chamber including a dielectric window; a coil-shaped rf antenna, provided outside the dielectric window; a substrate supporting unit provided in the processing chamber; a processing gas supply unit; an rf power supply unit for supplying an rf power to the rf antenna to generate a plasma of the processing gas by an inductive coupling in the processing chamber, the rf power having an appropriate frequency for rf discharge of the processing gas; a correction coil, provided at a position outside the processing chamber where the correction coil is to be coupled with the rf antenna by an electromagnetic induction, for controlling a plasma density distribution on the substrate in the processing chamber; a switching device provided in a loop of the correction coil; and a switching control unit for on-off controlling the switching device at a desired duty ratio by pulse width modulation.. .
07/31/14
20140214136
Pulse width modulation control for battery-powered laser device
A battery-powered laser-based dermatological treatment device may include a laser unit comprising at least one laser diode, a battery unit, at least one sensor configured to generate sensor signals, and a laser drive control system including a laser drive circuit comprising the laser unit, the battery unit, a first switch (e.g., a first fet), and a second switch (e.g., a second fet), wherein the laser unit is arranged in series between the first switch and the second switch, and control electronics configured to control the first switch based at least on sensor signals from the at least one sensor, and control the second switch using pulse width modulation (pwm), thereby delivering current from the battery unit to the laser unit with a pwm current waveform. The laser drive circuit may also include a snubber circuit configured to prevent voltage spikes upon the second switch being turned off..
07/31/14
20140211081
Driver circuit for a camera voice coil motor
A driver circuit for a camera voice coil motor (vcm) is described. A first power switch selectively conducts current from a vcm node to a power supply node, and a second power switch selectively conducts current from the vcm node to a power return node.
07/31/14
20140210697
Display circuitry with dynamic pixel backlight and backlight sloping control
A system may include a processor, a graphics controller, and a display. The graphics controller may generate video data to be presented on the display.
07/31/14
20140210534
Pulse width modulation signal generation circuit and pulse width modulation signal generation method
The present invention discloses a pwm signal generation circuit and a pwm signal generation method. The pwm signal generation circuit includes: a reference signal generation circuit for generating a reference signal according to an input voltage; a variable ramp signal generation circuit for generating a variable ramp signal; and a comparator circuit for comparing the reference signal with the variable ramp signal to generate a pwm signal.
07/24/14
20140204630
Current balance control for non-interleaved parallel bridge circuits in power converter
Systems and methods for reducing current imbalance between parallel bridge circuits used in a power converter of a power generation system, such as a wind driven doubly fed induction generator (dfig) system, are provided. The power converter can include a plurality of bridge circuits coupled in parallel to increase the output power capability of the system.
07/24/14
20140203743
Drive apparatus and drive method for brushless motor
The present invention relates to a drive apparatus that drives a brushless motor with a square wave, and relates to a drive method thereof. The drive apparatus limits a duty cycle of once in n times of pulse width modulation periods so that the duty cycle does not fall below a set value, and increases the n value according to a rotation speed of the brushless motor, and then obtains position information in a period in which the duty cycle is limited to the predetermined duty cycle.
07/17/14
20140201559
Control system and method for fans
A control system comprises a power distribution unit (pdu), a number of fan modules, a processing module, and a storage module. The pdu comprises a number of power-output terminals.
07/17/14
20140197854
Resistance determination for temperature control of heated automotive components
Electrical resistance of a heated component is determined for temperature control and monitoring. A voltage-representation signal, which is proportional to a voltage across a heater component, is received.
07/17/14
20140197810
Multi-phase dc-dc converter and controlling method thereof
A multi-phase dc-dc converter and a controlling method thereof are provided. The multi-phase dc-dc converter includes a plurality of output units, a sensing unit, and a pulse width modulation (pwm) controller.
07/17/14
20140197765
Methods and apparatuses for controlling output voltages of inverters driving of electric motors
A method of controlling an output voltage of an inverter driving an electric motor may include removing harmonic components of an output current, which is output to the electric motor, by using a low pass filter and obtaining a fundamental component of the output current; calculating a current total harmonic distortion by using the fundamental component of the output current; comparing the current thd with a reference current thd; determining a pulse width modulation method to be changed from a first modulation method for reducing the harmonic components of the output current to a second modulation method for reducing a switching frequency of the inverter if the current thd is less than the reference current thd, the pwm method modulating a pulse width of a control pulse signal for controlling the output voltage of the inverter; and/or generating the control pulse signal based on the determined pwm method.. .
07/10/14
20140192568
Inverter for a distributed power generator
Provided is a maximum power point (mpp) tracker for a pv cell inverter, and a pv cell inverter. The mpp tracker decouples output power oscillations from the input power generation and extracts maximum available power from the pv cell.
07/10/14
20140191743
Current mode control arrangement and method thereof
Control circuitry for providing a control signal in a pulse width modulating regulating power converter wherein an output parameter delivered by the converter is regulated by pulse width modulation of current within the converter, including circuitry for receiving a sensed output parameter of the converter; circuitry for deriving therefrom an analog average current demand signal corresponding to a current that would bring the converter into regulation; circuitry for receiving a sensed present value of the current within the converter to provide an analog signal representative thereof; circuitry for differencing the average current demand signal and the analog signal to provide an error signal; a compensator arranged to average the error signal to provide a second error signal; a sawtooth generator providing an analog signal as a pulse width modulation ramp; and a comparator to which the ramp is applied to generate the control signal at the output thereof.. .
07/10/14
20140191681
Circuitry for current regulated, externally controlled led driving
A current driver circuit for regulating a light emitting diode (led) is disclosed. An example driver circuit uses one input node of the driver circuit for controlling both maximum brightness and dimming of an led coupled to an output node of the driver circuit.
07/03/14
20140188424
Fan test device
A fan test device is connected to an interface of a fan under test on a motherboard. The fan test device includes a connector, a power test unit, a signal test unit, a single chip microcontroller (scm), and a keyboard.
07/03/14
20140185836
Pulse width modulator and switching amplifier
A pulse width modulation signal with a less distortion component that is not influenced by a common-mode noise or an offset voltage is generated. Pulse signal generation circuits 6, 7 generate pulse signals s1, s2 whose pulse widths are discharge times t1, t2 of integrators 3, 4, respectively, a pwm signal generation circuit 8 detects discharge end timings of the integrators 3, 4 based on the pulse signals s1, s2, and a pulse whose pulse width is a time between discharge end timing of one of the integrators 4 and discharge end timing of the other one of the integrators 3 is generated so as to be output as a pwm signal spwm..
07/03/14
20140185335
Power converter system with synchronous rectifier output stage and reduced no-load power consumption
A power converter circuit may convert alternating current signals into direct current signals. A load may be powered from output terminals that are provided with the direct current signals.
07/03/14
20140184485
Backlight driver of liquid crystal display device and method of driving the same
A backlight driver and a method of driving the same are disclosed. The backlight driver includes a vertical synchronization signal filter for generating a second vertical synchronization signal based on an input first vertical synchronization signal, and selecting one of the first vertical synchronization signal and the second vertical synchronization signal as a third vertical synchronization signal according to whether a period difference between adjacent first vertical synchronization signals satisfies a preset threshold range, a duty ratio detector for detecting a duty ratio of an input pulse width modulation (pwm) signal, a pwm generator for generating an output pwm signal synchronized with the third vertical synchronization signal output from the vertical synchronization signal filter and having the duty ratio and outputting the output pwm signal to a backlight unit..
07/03/14
20140184126
Fan control circuit
A fan control circuit includes a hardware controller, a rectifier circuit, first to third electronic switches, and a fan. When the hardware controller outputs a pulse width modulation (pwm) signal to the rectifier circuit and the fan, the rectifier circuit transforms the pwm signal into a direct current (dc) voltage and outputs the dc voltage to the first electronic switch.
07/03/14
20140184124
Computing device and method for protecting fan of computing device
In a method for protecting a fan of a computing device, firstly, a current supplied to the fan is read. Secondly, if the current supplied to the fan is more than or equal to a predefined current, a baseboard management controller(bmc) is controlled to send a pulse width modulation (pwm) signal to decrease a duty cycle of the fan by a predefined proportion, so that the current supplied to the fan is decreased.
06/26/14
20140176103
Control method and control apparatus
A control method and a control apparatus are provided. The control method and apparatus are applied to a buck-boost topology.
06/26/14
20140176097
Multi-phase dc-dc power converter
A multi-phase dc-dc power converter is provided, which includes a pulse width modulation (pwm) controller and a plurality of output stage circuits. The plurality of output stage circuits converts an input voltage into an output voltage.
06/26/14
20140176091
Dc-dc controller and control method thereof
A dc-dc controller and a control method thereof are provided. The dc-dc controller is coupled to an output stage.
06/26/14
20140176032
Back electromotive force detection circuit, and motor driving control apparatus and motor using the same
There are provided a back electromotive force detection circuit, and a motor driving control apparatus and a motor using the same. The back electromotive force detection circuit includes: a voltage generating unit generating a voltage in inverse proportion to a duty ratio of a pulse width modulation (pwm) signal; a variable amplifier controlling a gain according to the voltage generated by the voltage generating unit, and amplifying back electromotive force according to the controlled gain; and a comparator comparing an output from the variable amplifier with a pre-set reference signal, and outputting a zero-crossing signal of the back electromotive force..
06/19/14
20140169587
Electronic device and method for adjusting volume levels of audio signal outputted by the electronic device
An electronic device includes an audio sensor, an audio output unit, a pulse width modulation (pwm) unit connected to the audio output unit, and a control chip. When the audio output unit outputs the audio signal, the audio sensor detects a volume level of the environment sound.
06/19/14
20140169046
Power supply apparatus with low standby power consumption
An electronic apparatus is removed from a power supply apparatus and that can be certified by detecting a secondary-side transformer coil by a no-load detecting unit. The no-load detecting unit is configured to turn off an output switch unit and a power factor correction and pulse width modulation controller.
06/19/14
20140167712
Method and apparatus for controlling converter in full cell vehicle
A method and apparatus for controlling a converter of a fuel cell vehicle that uses a power control value generated based on an inverter dc terminal voltage as a reference value, and generates a current reference signal based on the reference value is provided. More specifically, the method and apparatus output a final reference signal that generates a pulse width modulation (pwm) signal by compensating for the current reference signal based on output terminal current of the converter.
06/19/14
20140167643
Method for controlling a light emitting device in a cooktop appliance
Systems and methods of variably controlling a driver signal to a light emitting device located proximate to a burner assembly of an appliance are provided. The driver signal can be adjusted based on a signal indicative of a temperature in a region proximate the light emitting device.
06/19/14
20140167636
Method and apparatus for driving light emitting diode
An led driving method is provided. The method includes the steps of: receiving a brightness control signal, wherein the brightness control signal represents a duty cycle of an led within a pulse width modulation cycle, and the duty cycle is indicated by a plurality of illuminating clocks; dividing the pwm cycle into a plurality of sub-pwm cycles; and equally distributing the illuminating clocks to each of the sub-pwm cycles..
06/19/14
20140165547
System and methods for controlled lowering and lifting of a load
A system and method for the controlled lowering and lifting of a load are disclosed. The system and method may include operating a work machine having a hydraulic system including a hydraulic actuator for supporting a load, a first control valve in fluid communication with the actuator, and a controller for operating the first control valve.
06/12/14
20140159691
Switching power source device
A switching power source device according to the present invention has a control portion that performs, at predetermined cycles, pwm pulse width modulation) driving with respect to an output transistor and a synchronous rectification transistor so that a desired output voltage is generated from an input voltage and a rectification method changeover portion that performs changeover of a rectification method so that, in one cycle, a synchronous rectification operation and a diode rectification operation are performed in a time-shared manner.. .
06/12/14
20140159684
Buck power converter
A buck power converter includes a power transistor, an inductor, a first diode, and an anti-ringing circuit. The power transistor has a first terminal, a second terminal, and a control terminal.
06/12/14
20140159625
Motor driving module, operating method for the same, and brushless dc motor system
The inventive concept provides a motor driving module, a operating method for the same, and a brush less direct current (bldc) motor system. The motor driving module is provided which comprises a motor driving unit configured to output a plurality of switching signals based on a plurality of position signals and a control signal; and a pulse width modulation (pwm) inverter configured to output 3-phase voltages based on the plurality of switching signals outputted from the motor driving unit, wherein the motor driving unit comprises; a correction circuit configured to detect an error of the plurality of position signals to output a compensation signal based on the detecting result; and a control circuit configured to output the plurality of switching signals based on the compensation signal and the control signal, wherein the plurality of position signals indicate a position of a rotor in an external motor..
06/05/14
20140153935
Clock regeneration circuit, light receiving circuit, photocoupler, and frequency synthesizer
A clock regeneration circuit includes: a signal input terminal; a d flip-flop circuit; a reset signal generation circuit; a delay circuit; a comparator; a first capacitor; and a feed back circuit. The signal input terminal is inputted with a pulse width modulation signal.
06/05/14
20140152491
Electronic device and method for sensing active state of object
An electronic device and a method for sensing an active state of an object are provided; the electronic device includes a signal generating module, a non-symmetric antenna module and a signal analyzing module. The signal generating module is configured to generate a pulse width modulation signal, generate a measuring signal with overshoot and undershoot pulses according to the pulse width modulation signal, and generate a reference signal according to the measuring signal.
06/05/14
20140152285
Average load current detector for a multi-mode switching converter
An average load current detector for a multi-mode switching converter is disclosed. The average load current detector includes a sense voltage generator that generates an average sense voltage that is proportional to an average load current delivered by the multi-mode switching converter.
06/05/14
20140152222
Electronic commutation method in direct current electric motors
In an electronic commutation method in direct current electric motors which are controlled by pulse width modulation of the energization which takes place periodically with positive and negative current values and intermediate energization pauses, the counter-induction voltage is measured, wherein the zero crossing of the counter-induction voltage is determined by means of the point of intersection of the envelope to the counter-induction voltage with the zero line. The pulse width modulation of the energization is changed if the zero crossing is covered by positive or negative current values of the energization..
06/05/14
20140152218
Control device and method for determining the rotor angle of a synchronous machine
A method for determining the rotor angle of a synchronous machine. In one implementation, the method includes generating a multiplicity of pulse-width-modulated drive signals for the phases of an inverter feeding the synchronous machine depending on a voltage to be fed into the synchronous machine, changing the pulse width modulation frequency of at least one drive signal of the multiplicity of pulse-width-modulated drive signals, with the result that the duration of the switching states of the inverter in which an active voltage phasor is output is extended in order to generate a switching pattern for the phases of the inverter, driving the inverter with the generated switching pattern, determining one or more of neutral point potentials at the neutral point of the synchronous machine during driving of the inverter with the switching pattern, and calculating the rotor angle of the synchronous machine depending on the determined neutral point potentials..
06/05/14
20140152104
Multi-output switching regulator and multi-output power supply method
The present invention discloses a multi-output switching regulator and a multi-output power supply method. The multi-output switching regulator includes: a power stage circuit for operating at least a power switch included therein and only one inductor included therein in response to a pulse width modulation (pwm) signal, thereby converting an input voltage to a converted voltage; a multiple outputs circuit for receiving the converted voltage to generate a plurality of output currents; a voltage detecting circuit for generating a feedback signal according to the converted voltage; and a pwm signal generation circuit for generating the pwm signal in response to the feedback signal..
05/29/14
20140146585
System and method for power conversion
A power converter is provided. The power converter includes a converter leg including switches for converting power.
05/29/14
20140145694
Power supply system
A power source system (5) includes a direct current power source (10), a direct current power source (20), and a power converter (50) having a plurality of switching elements (s1-s4) and reactors (l1, l2). The power converter (50) performs a direct current voltage conversion between the direct current power sources (10, 20) and a power source line (pl) in parallel by controlling the switching elements (s1-s4).
05/29/14
20140145693
Pulse width modulation dc-dc converter
A pwm dc-dc converter includes a switching unit converting an input voltage into an output voltage, a pid controller producing a pid control voltage, a comparator producing a switching control voltage, a switching controller which supplies a switching control signal to the switching unit, turns on a charge switch and at the same time turns off a discharge switch in an on-period of the switching control voltage, and turns off the charge switch and at the same time turns on the discharge switch in an off-period of the switching control voltage, and an operating point compensation unit which operates in response to an operating point compensation signal and supplies an initialization voltage of a uniform level to a node during a predetermined period for an initial drive.. .
05/29/14
20140145662
Motor driving apparatus and method
There are provided a motor driving apparatus and method, the motor driving apparatus including: a filter controlling unit detecting a frequency of a pulse width modulation (pwm) signal and generating a control signal; a first filtering unit filtering a back electromotive force (bemf) signal according to the control signal; a second filtering unit filtering a reference signal according to the control signal; and a comparing unit comparing output of the first and second filtering units and generating a motor rotor detection signal.. .
05/22/14
20140142477
Face massaging device
Disclosed is a massage device for human face for driving vibration modules of a mask individually even without an external power supply to massage local or overall area of the human face and for driving vibrators of the vibration modules in various vibration pattern of pulse width modulation (pwm) to provide various massage functions such as appeasing, rubbing, picking, pressing, and knocking similar to massage carried out by human hands. The facial massage device includes a mask having an accommodation space therein and at least one vibration module accommodate in the accommodation space of the mask and having own power supply for allowing an independent operation..
05/22/14
20140139278
Variable frequency ratiometric multiphase pulse width modulation generation
Groups of phase shifted pulse width modulation signals are generated that maintain their duty-cycle and phase relationships as a function of the period of the pwm signal frequency. The multiphase pwm signals are generated in a ratio-metric fashion so as to greatly simplify and reduce the computational workload for a processor used in a pwm system.
05/22/14
20140139131
Light emitting diode driving apparatus
There is provided a light emitting diode driving apparatus, including: a power supplying unit converting input power into driving power according to a control and supplying the converted driving power to a light emitting diode channel; a driving unit controlling current flowing in the light emitting diode channel according to a pulse width modulation (pwm) dimming signal from the outside; and a controlling unit comparing a reference level set by a duty of the pwm dimming signal with a detection voltage level of the light emitting diode channel and controlling a power converting operation of the power supplying unit according to the comparison result.. .
05/15/14
20140133545
System and method for multi-channel control system
A system having has a pulse width modulation controller to successively activate each of a plurality of channels each in its own individual channel time slot is described. The system also has a sampling multiplexer configured to successively sample a signal derived from each of the plurality of channels during each individual channel time slot.
05/15/14
20140133248
Apparatus and method to adjust clock duty cycle of memory
An embodiment of the invention provides a memory controller for controlling a memory. The memory controller comprises a pulse width modulation module, a voltage comparator and a duty cycle calibration device.
05/15/14
20140133205
Sine pulse width modulation controller
A sine pulse width modulation controller includes an edge detection unit for receiving a feedback input signal from the external electrical device to generate an edge signal, a register unit for storing and outputting a parameter signal, an angle increasing unit for receiving the edge signal and the parameter signal, determining cycles of pulse width modulation and generating an angle signal, a sine calculation unit for receiving the angle signal and performing a recursive algorithm based on the angle signal to implement the recursive algorithm so as to generate a sine calculation value, a multiplication unit for receiving the sine calculation value which is then further multiplied by the amplitude signal from the register unit to generate a pulse width signal, and a sine output unit receiving the pulse width signal to generate driving signals for driving the external electrical device to generate a sine terminal voltage.. .


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Pulse Width Modulation topics: Pulse Width Modulation, Modulation, Bridge Inverter, Duty Cycle, Control Unit, Ion Source, Illumination Source, Constant Current Source, Level Shift, Motor Control, Buck Boost, Capacitive Touch Sensor, Transmitter, Capacitive Touch, Reference Voltage

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