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| Number | Title | Issue Date |
| 8358518 | Switching regulator having terminal for feedback signal inputting and peak switching current programming A switching regulator of a power converter is provided and includes a feedback-input circuit, a programming circuit, and a peak-current-threshold circuit. The feedback-input circuit is coupled to a terminal of the switching regulator for receiving a feedback signal.... | 01/22/2013 |
| 8335093 | Power supply arrangement with output flow monitoring According to the invention, a blocking oscillator type converter circuit functions with a transformator that only comprises a primary winding and a secondary winding. Said transformator does not comprise a return coupling winding for the blocking oscillator. The con... | 12/18/2012 |
| 8320139 | Switching regulator with frequency limitation and method thereof A switching regulator with frequency limitation comprises a switch, a current sensing circuit, a voltage feedback circuit, a control circuit and a frequency limitation circuit. The current sensing circuit senses the current flowing through the switch and generating ... | 11/27/2012 |
| 8270185 | Switching mode power supply with a spectrum shaping circuit In accordance with the teachings described herein, systems and methods are provided for a switching mode power supply. In one example, the switching mode power supply may include a transformer, a switching circuit and a switching control circuit. The transformer rec... | 09/18/2012 |
| 8218340 | Switching power supply apparatus and primary side control circuit A synchronous rectification type DC-DC converter equipped with a burst mode prevents backward flows of currents on the secondary side thereof. The DC-DC converter turns off a control signal of a switching element on the primary side when the load thereof becomes lig... | 07/10/2012 |
| 8213192 | Primary side sensing for isolated fly-back converters A switching voltage regulator samples signals corresponding to a flyback voltage on an auxiliary winding on a primary side of the switching voltage regulator. The flyback voltage functions as feedback from the output voltage on the secondary side. On detection of pr... | 07/03/2012 |
| 8194423 | Method and apparatus to reduce audio frequencies in a switching power supply An example controller for use in a power supply regulator includes a switch signal generator, a modulation circuit, and a multi-cycle modulator circuit. The modulation circuit modulates the duty cycle of a pulse width modulated switching signal to provide a fixed pe... | 06/05/2012 |
| 8194422 | Method and apparatus for digital control of a switching regulator In one aspect, a power supply regulator includes a feedback terminal, a node, a control circuit, a first current source, and a second current source. The node is coupled to the feedback terminal to provide a feedback state signal in response to a feedback current th... | 06/05/2012 |
| 8159838 | Flyback converter system capable of preventing two side switches from being turned on simultaneously A flyback converter system prevents a primary side switch and a secondary side switch from being turned on simultaneously through a controller. The controller includes a turning on switch module, a turning off switch module, and an enabling switch module. The turnin... | 04/17/2012 |
| 8089782 | High accuracy average output current control scheme for power current converter in critical DCM High accuracy average output current control scheme for power current converter in critical DCM is composed of the reference block to generate preset reference; the reference calculation block, based on the power current converter's power topology, the correspondent... | 01/03/2012 |
| 8054655 | Tail current control of isolated converter and apparatus thereof An inventive isolated converter which exempts the auxiliary isolation devices with accurate voltage regulation is disclosed. The converter includes the primary side circuit with a primary controller controlling the on and off of the primary switch and a secondary si... | 11/08/2011 |
| 8031491 | Method and apparatus for on/off control of a power converter A power converter control method and apparatus is disclosed. An example power converter controller according to aspects of the present invention includes a feedback sampling circuit coupled to receive a feedback signal representative of an output of a power converte... | 10/04/2011 |
| 8000114 | Method and apparatus for a control circuit with multiple operating modes An apparatus of regulating a power converter with multiple operating modes includes a switch coupled to an energy transfer element coupled between an input and an output of the power converter. A control circuit is also included, which is coupled to the switch to co... | 08/16/2011 |
| 7965524 | Method and apparatus to reduce audio frequencies in a switching power supply A controller for use in a power supply regulator is disclosed. One controller includes a feedback circuit coupled to generate a feedback current signal that corresponds to a peak switching current in response to a sense signal from a power supply regulator output. A... | 06/21/2011 |
| 7957162 | Switch mode power supply and driving method thereof The present invention relates to a switch mode power supply and a driving method for reducing switching loss and audible noise in the burst mode. The switch mode power supply includes a main switch, a power supply, an output unit, and a switch controller. The power ... | 06/07/2011 |
| 7903435 | Switching controller having switching frequency hopping for power converter A switching controller having switching frequency hopping for a power converter includes a first oscillator generating a pulse signal and a maximum duty-cycle signal for determining a switching frequency of a switching signal, a pattern generator having a second osc... | 03/08/2011 |
| 7898825 | Adaptive ramp compensation for current mode-DC-DC converters A current-mode controller comprises an inductance element, at least one semiconductor switch coupled to the inductance element, and a ramp compensator coupled to sense an indication of current through the inductance element and coupled to control the at least one se... | 03/01/2011 |
| 7894216 | Switching power converter with efficient switching control signal period generation A power control system includes a switching power converter and a controller, and the controller responds to a time-varying voltage source signal by generating a switch control signal having a period that varies in accordance with at least one of the following: (i) ... | 02/22/2011 |
| 7876582 | Compensating on-time delay of switching transistor in switching power converters A switch controller compensates the total on-time delay of the switch in a switching power converter. The intended on-time of the switching transistor for the present switching cycle is reduced by the time difference between the actual on-time and the intended on-ti... | 01/25/2011 |
| 7830678 | Method and apparatus for digital control of a switching regulator Various techniques directed to the digital control of a switching regulator are disclosed. In one aspect, a power supply regulator includes a compare circuit to be coupled to receive a feedback signal representative of an output level of a power supply. This causes ... | 11/09/2010 |
| RE41908 | Power conversion integrated circuit and method for programming A single input pin (48) provides multi-functional features for programming a power supply (10). By connecting the appropriate interface circuit (92, 100, or 112) to the single input pin (48), the power supply (10) is program... | 11/02/2010 |
| 7764520 | Method and apparatus for on/off control of a power converter A power converter control method and apparatus is disclosed. An example power converter controller according to aspects of the present invention includes feedback sampling circuitry to be coupled to an output of a power converter. The feedback sampling circuitry is ... | 07/27/2010 |
| 7733673 | Method and apparatus to reduce audio frequencies in a switching power supply A controller for use in a power supply regulator is disclosed. One controller includes a feedback circuit coupled to generate an equivalent switching frequency signal in response to a sense signal from a power supply regulator output. A comparator is coupled to comp... | 06/08/2010 |
| 7724547 | Compensating on-time delay of switching transistor in switching power converters A switch controller compensates the total on-time delay of the switch in a switching power converter. The intended on-time of the switching transistor for the present switching cycle is reduced by the time difference between the actual on-time and the intended on-ti... | 05/25/2010 |
| 7643315 | Programmable feedback voltage pulse sampling for switched power supplies Disclosed is a method and apparatus that includes a power supply having a primary coil and a secondary coil. The secondary coil generates an output voltage and a feedback voltage related to the output voltage. The feedback voltage is sampled at a time instant that i... | 01/05/2010 |
| 7589983 | Power converter controller controlled by variable reference voltage generated by dual output digital to analog converter A power converter includes a switch controller having a dual output digital-to-analog converter for generating a variable reference voltage and a knee voltage offset from the reference voltage by a predetermined voltage. The variable reference voltage is generated b... | 09/15/2009 |
| 7561447 | Primary-side controlled switching regulator A switching regulator includes a switching device to switch a transformer from a primary-side to secondary side. A control circuit generates a switching signal for regulating output of the switching regulator. The control circuit includes a first circuit to generate... | 07/14/2009 |
| 7554821 | System and method for input current shaping in a power converter A power converter delivers electrical power from an electrical power source to a load according to a plurality of operation modes, where at least one of the operation modes is a peak current switching mode. Under the peak current switching mode, a switch controller ... | 06/30/2009 |
| 7548438 | System and method for input current shaping in a power converter A power converter delivers electrical power from an electrical power source to a load according to a plurality of operation modes, where at least one of the operation modes is a peak current switching mode. Under the peak current switching mode, a switch controller ... | 06/16/2009 |
| 7511974 | High voltage charging circuit A high voltage charging circuit is provided with the ability of rapid charging. The circuit is composed of a turn-on control circuit, a turn-off control circuit and a transistor. The turn-on control circuit is adopted to set a turn-on time of a transistor such that ... | 03/31/2009 |
| 7471523 | Method and apparatus for detecting demagnetizing time of magnetic device A detection circuit for detecting the demagnetizing time of a magnetic device is provided. An input circuit is coupled to the magnetic device for detecting a magnetizing voltage and a demagnetizing voltage of the magnetic device. A control circuit is coupled to the ... | 12/30/2008 |
| 7463497 | Regulator for isolated flyback power supply using primary side sensing A regulator for an isolated flyback power supply using primary side sensing. The regulator may include an error circuit configured to generate an error signal representative of the difference between a target value and a measured value, a sample and hold circuit, an... | 12/09/2008 |
| 7433211 | System and method for input current shaping in a power converter A power converter delivers electrical power from an electrical power source to a load according to a plurality of operation modes, where at least one of the operation modes is a peak current switching mode. Under the peak current switching mode, a switch controller ... | 10/07/2008 |
| 7426120 | Switching control circuit having a valley voltage detector to achieve soft switching for a resonant power converter The present invention provides a switching control circuit having a valley voltage detector to achieve the soft switching and improve the efficiency of a power converter. The switching control circuit includes a control circuit coupled to the feedback signal to gene... | 09/16/2008 |
| 7426123 | Finite state machine digital pulse width modulator for a digitally controlled power supply A method is disclosed for generating pulse width modulated pulse control signals for controlling switches in a switching power supply. First, a count value is determined of a master clock within a switching cycle of the power supply from beginning to end thereof. A ... | 09/16/2008 |
| 7394670 | Switching power source A control circuit 8 of a switching power source comprises a voltage detector 31 for detecting a voltage VDC of a DC power supply 1 to produce a detection voltage VDT; a comparator 41 for producing an output signal V | 07/01/2008 |
| 7375471 | Charging circuit A charging circuit has a battery 12, switching element 14, and resistor 16 for current detection arranged on the primary side of transformer 10. Diode 18 and capacitor 20 for storing electric power are arranged on the second... | 05/20/2008 |
| 7362592 | Switching control circuit for primary-side controlled power converters The present invention discloses a switching control circuit for a primary-side controlled power converter. A voltage-waveform detector produces a voltage-feedback signal and a discharge-time signal. A current-waveform detector generates a current-waveform signal by ... | 04/22/2008 |
| 7362593 | Switching control circuit having off-time modulation to improve efficiency of primary-side controlled power supply A voltage-waveform detector produces a voltage-feedback signal and a discharge-time signal by multi-sampling a voltage signal of a transformer. The discharge-time signal represents a discharge time of a secondary-side switching current. A voltage-loop error amplifie... | 04/22/2008 |
| 7352595 | Primary-side controlled switching regulator A switching regulator includes a switching device to switch a transformer from a primary-side to secondary side. A control circuit generates a switching signal for regulating output of the switching regulator. The control circuit includes a first circuit to generate... | 04/01/2008 |
