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| Number | Title | Issue Date |
| 8184456 | Adaptive power converter and related circuitry A resonant power converter circuit stage can be configured to: i) receive a rectified voltage derived from an AC input voltage; ii) convert the rectified voltage to an internal voltage based on the application of a duty cycle that varies depending on the input volta... | 05/22/2012 |
| 8174851 | Method for operating a resonant power converter According to an exemplary embodiment a method of operating a resonant power supply comprises controlling the resonant power supply in a discontinuous way. According to an exemplary embodiment a resonant power supply comprises a first switching element, and at least ... | 05/08/2012 |
| 8164925 | Non-contact power feeder [Problems] To provide a non-contact power feeder that is high efficient and high power factor and has no load dependence. [Means for Solving Problems] A series capacitor Cs1 is connected to a primary winding 1 driven by an AC power... | 04/24/2012 |
| 8149599 | Controller circuit and system having such a controller circuit A controller circuit is specified, having a step-up controller, a resonant converter connected downstream of the step-up controller on the output side, a transformer, a rectifier, which rectifier is connected to the secondary winding of the transformer on the input ... | 04/03/2012 |
| 8107262 | Variable switching frequency type power supply There is provided a variable switching frequency type power supply that can achieve high efficiency by fixing a switching duty cycle to 50% and varying switching frequency. A variable switching frequency type power supply according to an aspect of the invention may ... | 01/31/2012 |
| 8107263 | Series resonant converter A series resonant converter circuit that reduces power loss is provided that includes an inverter circuit having at least a pair of first and second switching elements that is connected between DC input terminals, a transformer connected to this inverter circuit, a ... | 01/31/2012 |
| 8102677 | Switching power supply device and method for adjusting dead time thereof A resonant switching power supply device includes: a first switching element and a second switching element which are configured to convert and adjust power. A capacitance of a first/second gate-drain capacitor existing between a gate and a drain of the first/second... | 01/24/2012 |
| 8094467 | Induction power system An induction power system configured to drive a load includes a primary side circuit (PSC) and a secondary side circuit (SSC). The PSC has a main inductor configured to generate a current-induced magnetic field. The SSC has an induction electrification unit (IEU) an... | 01/10/2012 |
| 8085559 | Current mode control for resonant converter circuits A current mode resonant converter integrates current information from a first drive transistor to generate an integration signal. The integration signal is added to a sawtooth signal to generate a quasi-sawtooth signal. The quasi-sawtooth signal is compared to an er... | 12/27/2011 |
| 8085558 | Resonant converter A resonant converter includes a square wave generator including a first switch and a second switch, and generating a first square wave corresponding to an input voltage by alternately turning on/off the first and second switches; a resonator including a first coil o... | 12/27/2011 |
| 8077485 | Circuit for transmitting an amplified resonant power to load A circuit for transferring amplified resonant power to a load is disclosed. The circuit transfers amplified resonant power, which is generated in an inductor of a conventional transformer when serial or parallel resonance of a conventional power supply is formed, to... | 12/13/2011 |
| 8064228 | Power supply apparatus with current-sharing function A power supply apparatus with a current-sharing function includes a conversion circuit, a square-wave generating circuit, a resonant circuit, and a rectifier-filter circuit. The conversion circuit has two transformers, and each of the transformers has a primary wind... | 11/22/2011 |
| 8059430 | High efficiency DC-DC converter for reduced switching loss A DC-DC converter includes: a first series circuit in which a resonance reactor, a primary winding of a transformer, and a switching element are connected in series, the first series circuit being connected to both ends of a direct current power supply; a second ser... | 11/15/2011 |
| 8054653 | DC power supply for varying output voltage according to load current variation A direct current (DC) power supply for varying an output voltage according to a load current variation is disclosed. The DC power supply includes an alternating current (AC)/DC conversion unit converting commercial AC power into DC power, a DC/DC conversion unit con... | 11/08/2011 |
| 8040696 | Resonant converter system having synchronous control circuit and controlling method thereof The configurations of a resonant converter system and a controlling method thereof are provided. The proposed resonant converter system includes a resonant converter receiving an input voltage for outputting an output voltage, a rectifying device having a first rect... | 10/18/2011 |
| 8040697 | Resonant circuit and resonant power converter with a narrow operating frequency bandwidth A resonant circuit has two parallel resonant branches and one assistant inductor connecting the two resonant branches. Each resonant branch has a series capacitor and a series inductor connected in series. The other end of the series inductor is for connecting to a ... | 10/18/2011 |
| 8036000 | Resonant converter system and controlling method thereof having relatively better efficiency The configurations of a resonant converter system and a controlling method thereof are provided. The proposed resonant converter system includes a resonant converter and a hybrid control apparatus coupled to the resonant converter for generating a driving signal to ... | 10/11/2011 |
| 8036001 | Resonant converter with variable frequency controlled by phase comparison A converter and a driving method thereof are provided. The converter includes first and second switches, and generates a square wave signal according to operations of the first and second switches. The converter includes a first capacitor and a primary coil, and res... | 10/11/2011 |
| 8023289 | Offline synchronous rectifier with causal circuit for resonant switching power converter A synchronous rectifier of a resonant switching power converter is provided to improve efficiency. The synchronous rectifier includes a power transistor and a diode connected to a transformer and an output of the resonant switching power converter for ratifications.... | 09/20/2011 |
| 8014176 | Resonant switching power converter with burst mode transition shaping A resonant switching power converter having burst mode transitioning operates during low or zero load conditions with reduced audible noise and component stresses, while improving efficiency. Pulse bursts are generated with a beginning and/or ending pulse duration t... | 09/06/2011 |
| 8000113 | Efficient power regulation for class-E amplifiers A power converter device and method are provided. The power converter device includes an input power source and an input inductor configured for coupling a power of the input power source to the device. A switch is configured to regulate a power of the input power s... | 08/16/2011 |
| 7990739 | Asymmetrical resonant power converters A resonant power converter is provided and includes a capacitor, an inductive device, a first transistor, a second transistor, and a control circuit. The capacitor and the inductive device develop a resonant tank. The first transistor and the second transistor are c... | 08/02/2011 |
| 7944715 | Controller for use in a resonant direct current/direct current converter A controller is adapted for controlling a switch of a resonant direct current/direct current converter, and includes: a pulse width modulation controlling unit for detecting an output voltage of the resonant direct current/direct current converter, and for generatin... | 05/17/2011 |
| 7940534 | Resonant transformer systems and methods of use Resonant transformer systems and methods of use are described. One aspect may include a primary winding, a secondary winding, and at least one output winding. In further aspects, a transformer may be coupled to the secondary winding. In one aspect, the output windin... | 05/10/2011 |
| 7924577 | Two terminals quasi resonant tank circuit A power converter includes a transformer, a primary switch, an auxiliary switch, first and second resonance capacitors, and a secondary side rectification means. A switch mode power supply is formed to use reflected voltage and parasitic capacitance as an energy sou... | 04/12/2011 |
| 7924578 | Two terminals quasi resonant tank circuit A power converter includes a transformer, a primary switch, an auxiliary switch, first and second resonance capacitors, and a secondary side rectification means. A switch mode power supply is formed to use reflected voltage and parasitic capacitance as an energy sou... | 04/12/2011 |
| 7916506 | Control device for use in a resonant direct current/direct current converter A control device for controlling a switch unit of a resonant direct current/direct current converter includes a frequency modulation controller and a pulse selector. The frequency modulation controller is adapted to be coupled electrically to the converter for recei... | 03/29/2011 |
| 7911812 | Control arrangement for a PFC power converter In a PFC (Power Factor Correction) converter control unit, a PWM (pulse width modulated) signal is produced by comparing a PFC converter output voltage error signal, produced by a transconductance amplifier, with a ramp signal, which may be from a control unit of a ... | 03/22/2011 |
| 7889519 | Methods and apparatus for a resonant converter Methods and apparatus for a dc-dc converter for operating at substantially fixed switching frequency, the converter including a rectifier, and a resonant inverter coupled to the rectifier, the resonant inverter including a switch and a reactive network having first,... | 02/15/2011 |
| 7885085 | Cascaded PFC and resonant mode power converters A control unit controls cascaded PFC and LLC converters, the LLC converter having an input coupled to an output, of the PFC converter and providing an output voltage that decreases with increasing switching frequency. The control unit produces a sawtooth waveform wi... | 02/08/2011 |
| 7869230 | Resonance circuit for use in H-bridge DC-DC converter The present invention discloses a resonance circuit for use in an H-bridge DC-DC converter, the resonance circuit comprising: an H-bridge converter, capable of converting unstable DC power into stable DC power; a first resonance circuit, disposed on a buck side of t... | 01/11/2011 |
| 7843708 | Synchronous rectifier type series resonant converter for operating in intermittence mode A synchronous rectifier type SRC for operating in an intermittence mode, which includes: an input power for supplying an input DC voltage; an input-side switching unit; a transformer with a primary winding and a secondary winding; an output-side switching unit for s... | 11/30/2010 |
| 7830676 | Primary only constant voltage/constant current (CVCC) control in 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... | 11/09/2010 |
| 7796406 | Apparatus and method for high efficiency isolated power converter A DC-DC converter apparatus comprising half or full bridge, two-stage resonant converter, which may include series resonant (inductor, capacitor) devices. An isolated transformer having primary and secondary winding supplies current to full-wave secondary stage-brid... | 09/14/2010 |
| 7791908 | Switching mode power supply (SMPS) device, image forming apparatus including the SMPS device, and method of driving the SMPS device A switching mode power supply (SMPS) device includes a power converting part that converts an input voltage into an output voltage according to a switching signal, and outputs a primitive switching signal for use in varying a frequency of the switching signal based ... | 09/07/2010 |
| 7791909 | Quasi-resonant converter and controlling method thereof The present invention relates to a quasi-resonant converter. In the quasi-resonant converter according to the present invention, a predetermined first period and a second period following to the first period are set. In the second period, a switch is turned on at a ... | 09/07/2010 |
| 7782633 | Non-contact power transmission device A non-contact power transmission device, which is capable of efficiently reducing the device size and reducing unnecessary radiation of a harmonic component from a primary side coil, is provided. The non-contact power transmission device which includes a primary sid... | 08/24/2010 |
| 7778048 | Switching power supply apparatus In a switching power supply apparatus, an inductor, a transformer, a first switching circuit, a second switching circuit, and a capacitor are connected to each other so that a first switching element and a second switching element can be alternately turned on and of... | 08/17/2010 |
| 7764515 | Two terminals quasi resonant tank circuit A power converter includes a transformer, a primary switch, an auxiliary switch, first and second resonance capacitors, and a secondary side rectification means. A switch mode power supply is formed to use reflected voltage and parasitic capacitance as an energy sou... | 07/27/2010 |
| 7751208 | Forward power converter controllers This invention relates to control techniques and controllers for resonant discontinuous forward power converters (RDFCs). A controller for a resonant discontinuous forward converter (RDFC), said converter including a transformer with primary and secondary mat... | 07/06/2010 |
