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Switched Mode Power Supply patents

      

This page is updated frequently with new Switched Mode Power Supply-related patent applications.

Switched mode power supply compensation loop
A controller for controlling an output voltage of a switched mode power supply (smps) comprising a sampling module arranged to sample a signal indicative of the output voltage of the smps at a frequency higher than a switching frequency of the smps, and a filter module arranged to filter out a ripple component of the sampled signal, comprising: a ripple component estimation module arranged to estimate the ripple component by calculating, for each sample of a plurality of the samples of the signal, an average sample value using the sample value and sample values obtained at corresponding points in preceding switching periods of the smps, the sample at each of said corresponding points being separated from said sample of the plurality of samples by a respective integer number of switching periods of the smps. The controller further comprises a subtraction module arranged to subtract the estimated ripple component from the sampled signal to generate a filtered signal, and a switching control module arranged to generate a control signal for controlling at least one of the switching frequency and a switching duty cycle of the smps based on the filtered signal..
Telefonaktiebolaget L M Ericsson (publ)


Active clamp circuit for switched mode power supplies
Switched mode power supply (smps) with at least one active clamp circuit and method of operating such a smps are described. The active claim circuit utilizes a clamp switch, a zener diode and a clamp capacitor that are connected in series between one side of a particular winding of a transformer and the other side of the particular winding of the transformer..
Nxp B.v.


Switched mode power supply with reduced delay time
Switched mode power supply (smps) with a control circuitry and method of operating such a smps are described. The control circuitry includes a first driver to drive an input switch in response to a driving signal, a pulse circuit to generate a pulse signal in response to the driving signal, a timer circuit to generate a delayed signal in response to the pulse signal and a second driver to drive to the output switch in response to the delayed signal..
Nxp B.v.


Auxiliary supply for a switched-mode power supply
An auxiliary supply for a switched mode power supply, which includes at least a transformer with a primary side and a secondary side, wherein the auxiliary supply provides a power supply to units arranged on the secondary side of the switched mode power supply independently of an operating state of the switched mode power supply, where the auxiliary supply in this case, on the primary side, which corresponds to the primary side of the switched mode power supply, has a frequency generator for generating an ac voltage with a predetermined frequency, where on the secondary side, which corresponds to the secondary side of the switched mode power supply, the auxiliary supply has a rectifier unit for a secondary side supply current and/or a secondary side supply voltage, and where a galvanic separation unit, which is particularly formed by two capacitors, is provided between the primary side and the secondary side.. .
Siemens Aktiengesellschaft


Switching frequency modulation in a switched mode power supply
In accordance with an embodiment, a method includes driving at least one electronic switch coupled to at least one inductor in a converter stage of a switched mode power supply based on a clock signal, and modulating a clock frequency of the clock signal over a predefined first frequency range around a center frequency such that a frequency spectrum of the clock signal is asymmetric. The switched mode power supply includes a filter coupled between the converter stage and an input of the switched mode power supply..
Infineon Technologies Austria Ag


Switched mode power supply with dynamic frequency foldback
In one form, a switched mode power supply controller with frequency foldback includes a pulse width modulator responsive to a clock signal to generate a drive signal having a pulse width that varies in response to a feedback signal, and a variable frequency oscillator having a first input for receiving the feedback signal, a control input for receiving a programmable control signal defining a foldback starting frequency, a foldback ending frequency, a foldback starting voltage, and a foldback ending voltage, and an output for providing the clock signal having a variable frequency that varies over a range between the foldback starting frequency and the foldback ending frequency as the feedback signal varies between the foldback starting voltage and the foldback ending voltage, respectively. In another form, a switched mode power converter uses such a switched mode power supply controller with an inductive element, switch, and feedback circuit..
Semiconductor Components Industries, Llc


Switched mode power supply
A switched mode power supply comprises a control signal generator arranged to generate first and second control signals via first and second outputs, respectively, which are coupled to respective first and second inputs of a switching stage, by means of respective first and second control signal paths. The switching stage is arranged to, responsive to the first and second control signals, alternately charge and discharge the reactive element by coupling it alternately to first and second supply voltages.
Telefonaktiebolaget Lm Ericsson (publ)


Electromagnetic interference blocking system
An apparatus and method for blocking electromagnetic interference, emi is presented. In particular, the present invention relates to a switched mode power supply provided with an electromagnetic interference protection circuit with low power dissipation.
Dialog Semiconductor Inc.


Reference voltage generator for a switched mode power supply
An isolated fly-buck converter is provided for converting an input voltage to an output voltage, and for generating a voltage indicative of the input voltage. The isolated fly-buck converter comprises on its secondary side an input voltage sensing circuit for generating the voltage indicative of the input voltage, the input voltage sensing circuit comprising a capacitive element and a rectifying element connected in series.
Telefonaktiebolaget L M Ericsson (publ)


Controlled adaptive power limiter
A power limiter for a switched mode power supply includes an operational amplifier and a comparator circuit. The operational amplifier is configured to receive an input voltage supplied to the smps as a first input and a reference voltage as a second input.
Microchip Technology Incorporated


Welding power supplies having adjustable current ramping rates

Welding power supplies having adjustable current ramping rates are disclosed. An example welding power supply, comprising: a switched mode power supply to convert primary power to welding-type power having an output current based on a current control loop; a voltage sensing circuit to measure a weld voltage; a voltage comparator to determine whether the weld voltage corresponds to a welding arc condition or a short circuit condition; and a control circuit to: select a current ramping rate; and execute the current control loop to control the output current, the control circuit configured to, while the weld voltage corresponds to the short circuit condition, increase the output current at the current ramping rate..
Illinois Tool Works Inc.

Control unit for a led assembly and lighting system

A control unit for an led assembly comprising a first and second led unit, said led units being serial connected is described. The led assembly, in use, is powered by a switched mode power supply.
Eldolab Holding B.v.

Control unit for a led assembly and lighting system

A control unit for a led assembly includes a first and second led unit, the led units being serial connected. The led assembly, in use, is powered by a switched mode power supply.
Eldolab Holding B.v.

Switched mode power supply control

An illustrative example embodiment of a method is for controlling a switch. The switch is used to charge a capacitor that provides an output voltage.

Variable power energy harvesting system

The disclosed invention provides examples of preferred embodiments including systems for harvesting energy from variable output energy harvesting apparatus. The systems include energy harvesting apparatus for providing energy input to a switched mode power supply and a control loop for dynamically adjusting energy harvesting apparatus input to the switched mode power supply, whereby system output power is substantially optimized to the practical.

Switched mode power supply compensation loop

A controller, and related method, configured to generate a duty cycle control signal for controlling an output voltage of a switched mode power supply as a function of a reference signal. In one embodiment, the controller is configured to sample a signal indicative of the output voltage to generate a first sampled signal, filter out a ripple component of the first sampled signal to generate a filtered signal, and generate a feedback control signal based on the filtered signal.
Telefonaktiebolaget Lm Ericsson (publ)

Systems and methods of non-invasive continuous adaptive tuning of digitally controlled switched mode power supply based on measured dynamic response

Example embodiments of the systems and methods of non-invasive continuous adaptive tuning of digitally controlled switched mode power supply based on measured dynamic response disclosed herein rely on time domain measurements for the tuning rather than on frequency response to automatically tune the system for stability and good dynamic performance. In particular, an algorithm directly measures overshoot and settling time to transients.
Texas Instruments Incorporated

Multi-output regulator with joint feedback

A multi-output switched mode power supply may include a power circuit and a controller to control the power circuit. A combiner circuit may produce a single feedback signal based on the regulated output voltages produced by the switched mode power supply..
Viasat, Inc.

Thd in off-line converters

A switched mode power supply (smps) receives an input voltage selectively connects and disconnects the input voltage from an inductor. The smps generates a charge in the inductor during a duty cycle portion while the input voltage is connected by generating control signals for selectively connecting to and disconnecting the input voltage from the inductor.
Semiconductor Components Industries, Llc

Nxp B.v.

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Envelope tracking modulator with feedback

There is disclosed an envelope tracking modulated supply arranged to generate a modulated supply voltage in dependence on a reference signal, comprising a low frequency path for tracking low frequency variations in the reference signal and including a switched mode power supply, a correction path for tracking high frequency variations in the reference signal and including a linear amplifier, a feedback path from the output of the linear amplifier to the input of the linear amplifier, and a combiner for combining the output of the switched mode power supply and the output of the linear amplifier to generate a modulated supply voltage.. .
Snaptrack, Inc.

Switched mode power supply converter

A method and apparatus for switched mode power supply (smps) system includes circuitry configured to produce a voltage output based on an input voltage, the smps circuitry includes inductive, capacitive and switching elements configured to generate the voltage output. The switching elements include at least one set of cascode coupled devices, each set of cascode coupled devices including a high electron mobility transistor (hemt) and one of a diode and a field effect transistor (fet) in a cascode coupling.
Semiconductor Components Industries, Llc

Isolated buck converter, switched mode power supply, and transferring digital data from a primary side to an isolated secondary side of an isolated buck converter

An isolated buck converter for converting an analog input voltage to an analog output voltage is capable of transferring digital data from the primary side to the secondary side. The converter comprises, on a primary side, a primary winding and a non-isolated buck connected in series, and a pair of switches switchable between a forward phase and a fly-buck phase.
Telefonaktiebolaget Lm Ericsson (publ)

Switched mode power supply compensation loop

There is provided a controller for controlling an output current of a switched mode power supply, smps. The controller comprises a sampling module arranged to sample a signal indicative of the output current of the smps at a frequency higher than a switching frequency of the smps, and a filter module arranged to filter out a ripple component of the sampled signal.
Telefonaktiebolaget Lm Ericsson (publ)

Electromagnetic flow sensor interface including sensor drive circuit

An interface circuit to an electromagnetic flow sensor is described. In an example, it can provide a dc coupled signal path from the electromagnetic flow sensor to an analog-to-digital converter (adc) circuit.
Analog Devices Global

Electromagnetic flow sensor interface allowing differential dc coupling

An interface circuit to an electromagnetic flow sensor is described. In an example, it can provide a dc coupled signal path from the electromagnetic flow sensor to an analog-to-digital converter (adc) circuit.

Electromagnetic flow sensor interface allowing dc coupling

An interface circuit to an electromagnetic flow sensor is described. In an example, it can provide a dc coupled signal path from the electromagnetic flow sensor to an analog-to-digital converter (adc) circuit.

Systems and methods of non-invasive continuous adaptive tuning of digitally controlled switched mode power supply based on measured dynamic response

Example embodiments of the systems and methods of non-invasive continuous adaptive tuning of digitally controlled switched mode power supply based on measured dynamic response disclosed herein rely on time domain measurements for the tuning rather than on frequency response to automatically tune the system for stability and good dynamic performance. In particular, an algorithm directly measures overshoot and settling time to transients.

Converter with hysteretic control

A hysteretic power converter constituted of: a switched mode power supply comprising an inductor, an electronically controlled switch and an output capacitor, the switch arranged to alternately open and close a loop with the inductor and a power source; a hysteretic comparator, a first input coupled to a feedback connection and arranged to receive from the feedback connection a feedback signal providing a first representation of the voltage across the output capacitor, the electronically controlled switch opened and closed responsive to an output of the hysteretic comparator; a reference voltage source arranged to generate a reference voltage, the generated reference voltage coupled to a second input of the hysteretic comparator; and a voltage coupler, the voltage coupler arranged to couple a second representation of the voltage across the output capacitor to the second input of the hysteretic comparator, such that the second representation is added to the generated reference voltage.. .
Microsemi Corporation

Switched mode power supply circuit

An smps (switched mode power supply) circuit includes a first switch element, a second switch element, an inductor, a capacitor, a current sensor, a current comparator, and a controller. The first switch element is coupled between a first power node and a switch node.
Mediatek Inc.

Switched mode power supply driver integrated with a power transmission antenna

A driver comprising a switched mode power supply, wherein said switched mode power supply comprises an existing coil, the driver circuit further comprises: a first power transmission antenna (42) formed as a first coil which is either the existing coil of the switched mode power supply or coupled to the existing coil of the switched mode power supply, said first power transmission antenna (42) is adapted for being magnetically coupled to a second power receiving antenna (44) thereby forming a wireless power transmitter.. .
Philips Lighting Holding B.v.

Power supply for led lamp with triac dimmer

A bleeder circuit is provided in a switched mode power supply (smps) that provides a compensation current when the loop current drops below the holding current of the triac to alleviate light flickering problem. Further, automatic power factor correction is also provided in embodiments of the invention, which enables the output current to be in phase with the input voltage.
Bcd Semiconductor Manufacturing Limited

Hvac components having a variable speed drive with optimized power factor correction

A power factor optimized variable speed drive unit for an electric motor of an hvac device is disclosed. In an embodiment, the unit includes a selectively-activatable power factor correction unit operatively associated with a switched mode power supply unit.
Trane International Inc.

Method of operating a switched mode power supply, computer program, and switched mode power supply

A method of operating a switched mode power supply comprising a switched mode converter and a control arrangement. The switched mode converter converts an input voltage to an output voltage and includes a primary winding, controllable switch based circuitry connecting the input voltage over the primary winding, a secondary winding coupled to the primary winding, and an lc filter including an inductive element and a capacitive element, wherein the output voltage is obtained as the voltage over the capacitive element and a duty cycle of the switched mode converter can be controlled by controlling the switch based circuitry.
Telefonaktiebolaget L M Ericsson (publ)

Switched mode power supply, base station, and operating a switched mode power supply

A switched mode power supply comprising a switched mode converter and a controller for controlling the switched mode converter, the switched mode converter being provided for converting an input voltage to an output voltage and including, on a primary side, a primary winding and a controllable switch based circuitry connecting the input voltage over the primary winding; and, on a secondary side, a secondary winding coupled to the primary winding and a capacitive element connected over the secondary winding, wherein the output voltage is obtained as the voltage over the capacitive element. The primary winding comprises a first winding portion and at least one further winding portion and the switch based circuitry comprises controllable switches capable of controlling the duty cycle of the switched mode converter and capable of switching between a first operation state wherein the input voltage is connected only over the first winding portion and at least a second operation state wherein the input voltage is connected over the first and the at least one further winding portions, thereby enabling switching between two different transformer ratios.
Telefonaktiebolaget L M Ericsson (publ)

Switched mode power supply with efficient operation at light loads and method therefor

A switched mode power supply includes an active clamp flyback converter having an input for receiving an input voltage, and an output for providing a regulated voltage, the active clamp flyback converter having a first switch for controlling a flow of current through a primary winding of a flyback transformer, and a second switch for clamping a switch node on a primary side of the flyback transformer, and a controller for controlling the first and second switches to operate the active clamp flyback converter in an active clamp flyback mode when a load current is above a first predetermined level, and for controlling the first and second switches to operate the active clamp flyback converter in a discontinuous conduction mode with a variable switching frequency when the load current is below a second predetermined level.. .
Semiconductor Components Industries, Llc

Combinatorial/sequential pulse width modulation

A number of standard pwm generators produce pwm signals that may be used to drive the power stages for full-bridge, feed-forward, push-pull, phase-shift zero voltage transition (zvt), and other switched mode power supply (smps) conversion topologies. These pwm signals may be fed to logic functions of a combinatorial logic block.
Microchip Technology Incorporated

Switched mode power supply having a staircase current limit

Disclosed is switching power supply that includes a pulse frequency modulation (pfm) mode of operation current feedback control. A reference current source is configured to output a reference current at one of several selectable levels.
Qualcomm Incorporated

Three input comparator

A three input voltage comparator provides termination of a pulse width modulation (pwm) output in a switched mode power supply. Shutdown of the pwm signal occurs when a sense current from the switching transistors exceeds either or both of the limit and error current references.
Microchip Technology Incorporated

Switched mode power supply and operating a switched mode power supply

A switched mode power supply comprises a switched mode converter and a controller for controlling the switched mode converter, wherein the switched mode converter is provided for converting an input voltage to an output voltage and includes, on a primary side, a primary winding and a controllable switch based circuitry connecting the input voltage over the primary winding; and, on a secondary side, a secondary winding coupled to the primary winding, and a capacitive element connected over the secondary winding, wherein the output voltage is obtained as the voltage over the capacitive element. The primary winding comprises a first winding portion and at least one further winding portion.
Telefonaktiebolaget L M Ericsson (publ)

Switched mode power supply and operating a switched mode power supply

A switched mode power supply comprises a switched mode converter (12) and a controller for controlling the switched mode converter, wherein the switched mode converter is provided for converting an input voltage (vin) to an output voltage (vout) and includes, on a primary side, a primary winding (x1) and a controllable switch based circuitry (31) connecting the input voltage over the primary winding; and, on a secondary side, a secondary winding (x2) coupled to the primary winding, and a capacitive element (c) connected over the secondary winding, wherein the output voltage is obtained as the voltage over the capacitive element. The primary winding comprises a first winding portion (np1) and at least one further winding portion (np2); and the switch based circuitry comprises controllable switches (q11, q41, q12, q42, q21, q31) capable of switching between a first operation state wherein the input voltage is connected only over the first winding portion and at least a second operation state wherein the input voltage is connected over the first and the at least one further winding portions, thereby enabling switching between two different transformer ratios (n1, n2)..
Telefonaktiebolaget L M Ericsson (publ)

System and secondary-side power regulation

It is possible to achieve more precise power regulation in switched mode power supply systems by performing at least some control-loop processing on the secondary-side of the transformer. In particular, a secondary-side measurement is processed at least partially by a secondary-side controller to obtain a switching indication signal.
Infineon Technologies Austria Ag

Precise and dynamic control of synchronous rectification switch voltage in a switched mode power supply

A switched mode power supply, in some embodiments, comprises a synchronous rectification transistor switch including a gate, and it further comprises an output driver coupled to the gate and providing a driving signal to the gate. The driving signal is determined based on a dynamically controllable clamp signal and a prior driving signal..
Semiconductor Components Industries, Llc

Switched mode power supply

A switched mode power supply (100) comprises a reactive element (10) and a control signal generator (30) is arranged to generate a first control signal at a first output (31) of the control signal generator (30) and a second control signal at a second output (32) of the control signal generator (30). The first output (31) of the control signal generator (30) is coupled to a first input (21) of a switching stage (20) by means of a first control signal path (40) and the second output (32) of the control signal generator (30) is coupled to a second input (22) of the switching stage (20) by means of a second control signal path (50).
Telefonaktiebolaget L M Ericsson (publ)

Control arrangement for a switched mode power supply

The disclosure relates to a control arrangement for a smps, the control arrangement comprising: an input terminal configured to receive a feedback-signal (v1) representative of an output of the smps; a normal-mode-processing-arrangement-configured to process the feedback-signal and provide a normal-mode-control-signal for operating the smps in a normal mode of operation; a burst-mode-processing-arrangement configured to process the feedback-signal and provide a burst-mode-control-signal for operating the smps in a burst mode of operation; and a feedback-control-processing-arrangement configured to operate the smps such that the feedback signal in the normal mode of operation has a predetermined relationship with the feedback signal in the burst mode of operation.. .

System and a switched-mode power supply

In accordance with an embodiment, a method of operating a switched-mode power supply includes starting up the switched-mode power supply by applying a first switching signal to a control node of the first switching transistor and a second switching signal to a control node of a second switching transistor, where a duty cycle of the first switching signal is less than a duty cycle of the second switching signal. After starting up the switched mode power supply, the switched mode power supply is operated by applying a third switching signal to the control node of the first switching transistor and a fourth switching signal to the control node of the second switching transistor, where a duty cycle of the third switching signal is substantially equal to a duty cycle of the fourth switching signal..

Switched mode power supply output stage configuration

A method of optimizing the number of output stages of a switched mode power supply features a dynamically-updated lookup table (lut) storing historic output stage configuration data per system operating performance point (opp). Upon entering an opp, a margin is added to the historic optimal configuration.

Variable power energy harvesting system

The disclosed invention provides examples of preferred embodiments including systems for harvesting energy from variable output energy harvesting apparatus. The systems include energy harvesting apparatus for providing energy input to a switched mode power supply and a control loop for dynamically adjusting energy harvesting apparatus input to the switched mode power supply, whereby system output power is substantially optimized to the practical.
Triune Systems, Llc

Method for preparing a current measuring arrangement, measuring an output current, controller, switched mode power supply, and base station

A method for preparing a current measuring arrangement of a switched mode power supply comprising a switched mode converter, and a controller for controlling the switched mode converter to convert an input voltage to an output voltage by means of controlling the duty cycle, is provided. A model, in which the output current of the converter is determined from variables and one or more model parameters, wherein the variables comprise the input voltage, the output voltage, and the duty cycle, is formed.
Telefonaktiebolaget L M Ericsson (publ)

Nxp B.v.

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Controller for a switched mode power supply and associated methods

The controller configured to provide for a normal mode of operation based on satisfaction of the voltage criterion and a power-saving mode of operation based on satisfaction of the time criterion, wherein the controller is configured to draw a power-saving-mode current in the power-saving mode of operation, and draw a normal-mode current in the normal mode of operation, wherein a magnitude of the normal-mode current is greater than a magnitude of the power-saving-mode current.. .

Control unit for a led assembly and lighting system

A control unit for an led assembly comprising a first and second led unit, said led units being serial connected is described. The led assembly, in use, is powered by a switched mode power supply.
Eldolab Holding B.v.

Switched mode power supply, a controller therefor, a lighting circuit and a control method

A switched mode power supply for converting an input voltage and comprising: a series arrangement of an inductor, a power switch and a control switch for controlling the power switch; a controller configured to control the control switch and having a supply terminal and a ground terminal; a capacitor coupled between the controller ground terminal and supply terminal and for providing power to the controller; a first current path arranged to provide charge to the capacitor only when the control switch is open and the power switch is closed; a connectable second current path arranged to draw current from the control terminal of the power switch thereby opening the power switch, and a connection switch configured to connect the second current path in response to a voltage across the capacitor exceeding a threshold voltage. A controller, lighting circuit and corresponding method are also disclosed..
Nxp B.v.