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| Number | Title | Issue Date |
| 8169797 | AC/DC intermediate-circuit converter having a very wide AC input voltage range An AC/DC intermediate-circuit converter has a very wide AC input voltage range with a ZVS three-level DC/DC resonant converter with an LLC series-resonant circuit. Two intermediate-circuit capacitors are connected in series between DC intermediate-circuit connection... | 05/01/2012 |
| 8149600 | System and method for ringing suppression in a switched mode power supply In one embodiment, a method of operating a switched-mode power supply having a switch coupled to a drive signal is disclosed. The method includes shutting off the switch with the drive signal at a first instance of time, and comparing a magnitude of a voltage of a p... | 04/03/2012 |
| 8102678 | High power factor isolated buck-type power factor correction converter A regulated power factor corrected power supply apparatus is provided. The apparatus includes an input rectifier circuit for receiving an input AC voltage and outputting a full-wave rectified DC voltage. A single-stage isolated buck-type converter is coupled with th... | 01/24/2012 |
| 8098502 | System and method for emissions suppression in a switched-mode power supply In one embodiment, a method of operating a switched-mode power supply that has a switch coupled to a drive signal is disclosed. The method includes deactivating the drive signal at a first instance of time, and comparing a power supply signal to a threshold after de... | 01/17/2012 |
| 7969754 | Control circuit for a switch unit of a clocked power supply circuit, and resonance converter A control circuit for a switch unit of a clocked power supply receives an auxiliary signal from a resonant transformer driven by the switch unit and detects reference crossing moments when the auxiliary signal crosses a reference value. A driver is controllable to s... | 06/28/2011 |
| 7961482 | Bi-directional HEMT/GaN half-bridge circuit A half-bridge circuit in accordance with an embodiment of the present application includes an input voltage terminal operable to receive an input voltage, a first bi-directional switch, a second bi-directional switch connected in series with the first bi-directional... | 06/14/2011 |
| 7957161 | Power converters A power converter capable of improving converter's efficiency and achieving zero-voltage-switching is provided, in which a first series circuit is connected in parallel with a direct current (DC) power supply and has a first inductor, a first primary winding, first ... | 06/07/2011 |
| 7907424 | Power supply device having zero switching voltage A power supply device having zero switching voltage is disclosed to include a first switch having a parasitic body diode, a first capacitor, an inductor, a transformer, a second switch having a parasitic body diode, a second capacitor, a first voltage output unit pr... | 03/15/2011 |
| 7826236 | Apparatus, system, and method for a switching power supply with high efficiency near zero load conditions An apparatus, system, and method are disclosed for a switching power supply with high efficiency near zero load conditions. A power detection module detects power provided to a load. The switching power supply is capable of operating in a zero voltage switching mode... | 11/02/2010 |
| 7760519 | Primary only control quasi resonant convertor A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a prima... | 07/20/2010 |
| 7746671 | Control circuit for a switch unit of a clocked power supply circuit, and resonance converter The invention involves a control circuit for a switch unit of a clocked power supply circuit, the switch unit being designed to effect input-side excitation of a resonant transformer arrangement, and comprises an input for receiving an auxiliary signal from the reso... | 06/29/2010 |
| 7649754 | Self limiting zero voltage switching power conversion networks The subject invention reveals a new three terminal canonical cell for non-isolated power conversion. The canonical cell achieves reduced semiconductor component stresses for applications with limited line voltage range for small step up and step down ratios or for l... | 01/19/2010 |
| 7570497 | Discontinuous quasi-resonant forward converter A discontinuous resonant forward power converter including a controller having an output coupled to a controllable switch and which is configured to control the switch such that a voltage waveform on a secondary winding of a transformer of the converter has a first ... | 08/04/2009 |
| 7558081 | Basic halogen convertor IC A driving circuit for providing a control signal to a power semiconductor device for providing power to a filament lamp, said driving circuit comprising an oscillator for generating said control signal. The driving circuit may further comprise a soft start circuit w... | 07/07/2009 |
| 7532488 | DC converter A primary winding 5a of a transformer T and a switch Q1 are connected in series with a DC power source Vdc1. A series circuit composed of a switch Q2 and a snubber capacitor C3 is connected in parallel with the primary windi... | 05/12/2009 |
| 7466569 | Power converter having phase lock circuit for quasi-resonant soft switching The present invention provides a power converter having a phase lock circuit for quasi-resonant soft switching. The power converter includes a first circuit coupled to the feedback signal to generate a switching signal for switching a switching device and regulating... | 12/16/2008 |
| 7450404 | Switching power supply and ZVS method thereof The provided switching power supply includes an auxiliary circuit having an auxiliary switch and a auxiliary capacitor, a transformer having a primary side coupled to the auxiliary circuit in parallel and a secondary side, an auxiliary switch control circuit coupled... | 11/11/2008 |
| 7411378 | Power factor controller that computes currents without measuring them A power factor controller for a switching power supply, that in one embodiment couples a power factor control circuit between an AC input and an output wherein a digital controller computes circuit currents for regulating the power supply without direct current meas... | 08/12/2008 |
| 7382062 | Wide voltage range stabilized switching power supply for valve actuators The invention finds application in the field of power supplies for valve actuators, and particularly relates to a wide voltage range stabilized switching power supply for valve actuators, of the type that comprises a filter 2, a diode bridge 3, an arra... | 06/03/2008 |
| 7359221 | Power supply for use in an electronic energy meter A three-phase electronic electricity meter that includes a power supply circuit operable to create a constant voltage output when receiving a variable voltage input. The power supply circuit of the electricity meter receives a three-phase line voltage and converts t... | 04/15/2008 |
| 7336037 | Intelligent electrical switching device The present invention, according to a preferred embodiment, is directed to portable electronic devices which operate on exhaustible power sources, for example, batteries. The electronic devices of the present invention comprise at least one signal switch and a micro... | 02/26/2008 |
| 7336057 | DC/DC converter A DC/DC converter includes: a boost converter that boosts an input voltage in accordance with a first control signal; an insulated converter that converts an output of the boost converter in accordance with a second control signal; a current sensor that detects an o... | 02/26/2008 |
| 7330708 | Tuning circuit with amplitude attenuation function and integrated circuit for radio communication apparatus There is disclosed a tuning circuit having a coil and a capacitor comprises a resistance-adjustment circuit connected in parallel with the coil and the capacitor. The resistance-adjustment circuit changes a resistance of the tuning circuit when resonant. The resista... | 02/12/2008 |
| 7330018 | Step-down controller circuit A step-down controller has an input having a first and a second input terminal for applying an input voltage, an output having a first and a second output terminal at which an output voltage can be provided, a series circuit including a switch and an inductance whic... | 02/12/2008 |
| 7304868 | DC converter A DC converter has a transformer with loosely coupled primary and secondary windings, a main switch connected in series with the primary winding of the transformer, and a series circuit connected to ends of one of the primary winding and main switch. The series circ... | 12/04/2007 |
| 7301786 | Quasi resonant type switching power supply apparatus with overcurrent limiting A quasi resonant type switching power supplying unit includes an overcurrent limiting circuit and an oscillation level comparison circuit. The overcurrent limiting circuit (i.e., a level determining circuit and a reference voltage generating circuit) receives a reve... | 11/27/2007 |
| 7295449 | Simple switched-mode power supply with current and voltage limitation This invention relates to a primary-controlled switched-mode power supply of the type of a free-running flyback converter, which comprises a transformer with a primary-side winding, a secondary-side winding and at least one auxiliary winding. The switched-mode power... | 11/13/2007 |
| 7292461 | Switching power source apparatus A switching power source apparatus has a switching element being connected with a DC power source through a primary winding of a transformer in which parasitic capacitance exists between terminals of the switching element. A voltage V4 of free oscillation app... | 11/06/2007 |
| 7291993 | Method for driving a fluorescent lamp and an inverter circuit for performing such a method A method for driving a fluorescent lamp and an inverter circuit for performing the same are used to reduce an amount of electromagnetic interference (EMI) generated by a transformer and an instantaneous loading of a DC voltage source. The inverter circuit comprises ... | 11/06/2007 |
| 7289340 | Switching power supply device A novel switching power supply device no more in need of a stand-by signal for turning on/off a switching element is provided. The switching power supply device is configured as having a main switching element Q1, wherein the switching power supply circuit is connec... | 10/30/2007 |
| 7286373 | Full-resonant power circuit device for receiving a variable input voltage The present invention provides a full-resonant power circuit device for receiving a variable input voltage that a power factor correcting circuit for separating a variable input voltage AC into a plurality of supply voltages, and the input voltage sections are detec... | 10/23/2007 |
| 7262562 | Method for driving a fluorescent lamp and an inverter circuit for performing such a method A method for driving a fluorescent lamp and an inverter circuit for performing the same are used to reduce an amount of electromagnetic interference (EMI) generated by a transformer and an instantaneous loading of a DC voltage source. The inverter circuit comprises ... | 08/28/2007 |
| 7260536 | Distributed voice and wireless interface modules for exposing messaging/collaboration data to voice and wireless devices In one aspect, a system for providing remote electronic services to a device includes an access module and a voice interface module. The access module is configured to expose messaging/collaboration data stored on a messaging/collaboration server. The voice interfac... | 08/21/2007 |
| 7254045 | Power supply circuit and electronic equipment A power factor is improved using a simplified structure without particularly providing a power factor improving circuit, and high efficiency is obtained. For this purpose, one terminal of a direct-current power source 12, from which a pulsating current is obt... | 08/07/2007 |
| 7245510 | Method and apparatus for conditional response to a fault condition in a switching power supply Techniques are disclosed to regulate an output of a power converter. One example power converter includes an energy transfer element coupled between an input and an output of the power converter. A switch included in the power converter is coupled to the input of th... | 07/17/2007 |
| 7239531 | Resonant lossless circuit for providing a low operating voltage in power converter A converter-controller includes a power device, coupled to the primary coil of a transformer, a resonant circuit, coupled to the primary coil and the power device, a voltage regulator, coupled to the resonant circuit, and a control logic, coupled to the voltage regu... | 07/03/2007 |
| 7239257 | Hardware efficient digital control loop architecture for a power converter A power converter including a hardware efficient control loop architecture. Error detection circuitry may generate an error signal based on the difference between a power converter output voltage and a reference voltage. An oversampling ADC may digitize the error si... | 07/03/2007 |
| 7218533 | Resonance converter with voltage regulation and method of driving variable loads In a resonance converter for driving variable loads at first an input signal provided by a switch controlled by control means is converted to an output signal by a transformer. The transformer is dimensioned and connected such that a downward transformation ratio be... | 05/15/2007 |
| 7218059 | Discharge-lamp control device A discharge-lamp control device for lighting a discharge-lamp includes two electrodes, first and second driving units to supply power to the discharge-lamp through the electrodes, respectively. Each driving unit includes a transformer having primary and secondary co... | 05/15/2007 |
| 7215105 | Method and apparatus for maintaining a constant load current with line voltage in a switch mode power supply A power supply including a regulation circuit that maintains an approximately constant load current with line voltage. An example circuit includes a switch including first, second and third terminals. The first terminal is coupled or decoupled to the second terminal... | 05/08/2007 |
