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| Number | Title | Issue Date |
| 8072787 | Synchronous rectifying for soft switching power converters An synchronous rectifying apparatus or synchronous rectifying circuit of a soft switching power converter is provided to improve the efficiency. The integrated synchronous rectifying circuit includes: a power transistor connected from a transformer to the output of ... | 12/06/2011 |
| 8031499 | Direct current/direct current converter with multiple outputs In a DC/DC converter comprising a transformer (10) having a primary winding Np and at least first and second secondary windings Ns1 and Ns2; a main output path connecting the first secondary winding to a main output Vp and comprising a synchrono... | 10/04/2011 |
| 8031498 | Active diode An active diode is disclosed. One embodiment provides a method for operating a device. The electronic device includes a transistor connected between a first and a second connection of the electronic device; a control device coupled to a control connection of the tra... | 10/04/2011 |
| 8031500 | Bridgeless power factor corrector with logic control The present invention discloses a bridgeless active power factor corrector with a logic control comprising a high frequency switch controller, a boost inductor, an output filtering capacitor, two boost transistor modules, two boost diodes, two AC input voltage polar... | 10/04/2011 |
| 8018749 | Synchronous rectifier The disclosed embodiments relate to apparatus and method for reducing power losses in a power supply. There is provided an apparatus comprising means for coupling a first signal (S2) to a reference level (ground) when the coupling means is conductive, mea... | 09/13/2011 |
| 7944723 | Matrix converters A matrix converter that can be used as part of a two-stage power converter has three ac three ac voltage lines AC1, AC2 and AC3 and two dc voltage lines DC1 and DC2. An array of six semiconductor switches 10a to 10... | 05/17/2011 |
| 7920396 | Synchronous rectifier and controller for inductive coupling A synchronous rectifier is arranged to rectify inductively coupled power using FETs (field effect transistors) to minimize the voltage drop of the rectifier, which minimizes power loss. Power loss is an important consideration in applications where fairly significan... | 04/05/2011 |
| 7903442 | Apparatus and methods for power conversion An alternating current (AC) to direct current (DC) power converter comprises a first electrical path in a primary circuit having an inductor coupled in series with a first primary winding and a first switch to a ground connection. A second electrical path in the pri... | 03/08/2011 |
| 7791914 | High efficiency power supply front end A system for converting alternating electrical current to direct electrical current may include an input supply for supplying alternating electrical current. The input supply may be connected to a rectifier. The rectifier may be configured as a body diode. A compara... | 09/07/2010 |
| 7773398 | DC power source device with timer controlled synchronous rectifiers in the secondary A DC power source device is provided which comprises conduction detectors 17, 18 for producing detection signals VP1, VP2 during the detective period of rectification MOS-FETs 15, 16 and timer circuits 19, 20 connected to p... | 08/10/2010 |
| 7773399 | Control apparatus for inhibiting synchronous-rectifier switching elements at low output current in a voltage transforming apparatus The control apparatus for controlling a voltage transforming apparatus having a transformer, power switching elements disposed in a primary side, and synchronous-rectifying switching elements disposed in a secondary side includes a judging circuit making a judgment ... | 08/10/2010 |
| 7768808 | Integrated synchronous rectifier package A controller for controlling a controlled switching device functioning as a synchronous rectifier of alternating current, the controller comprising a control circuit for sensing the direction of current through the controlled switching device, the controlled switchi... | 08/03/2010 |
| 7768807 | Bidirectional no load control with overshoot protection A method of operating an isolated bi-directional dc/dc converter to provide voltage regulation at a no-load condition over a wide voltage range and also provide overshoot protection for the boost mode main switching transistors uses new boost mode drive waveforms. T... | 08/03/2010 |
| 7751212 | Methods and apparatus for three-phase rectifier with lower voltage switches Methods and apparatus to provide a rectifier having a high power factor not limited by voltage ratings of switching devices. Methods and apparatus can include pairs of series-coupled switches coupled to a respective phase signal to, along with respective diode pairs... | 07/06/2010 |
| 7751213 | Self-driven synchronous rectifier A self-driven synchronous DC-DC converter (100) includes an input circuit (101) having a switching device (110) for selectively generating a pulsed DC input voltage responsive to an input switch control signal, the pulsed DC input voltage being ... | 07/06/2010 |
| 7751211 | Instantaneous voltage-drop compensation circuit, power conversion apparatus, instantaneous voltage-drop compensation method and computer readable medium storing instantaneous voltage-drop compensation program An instantaneous voltage-drop compensation circuit including: a first voltage detector detecting three-phase voltages to be input to a power converter converting three-phase AC to DC based on control pulse signals, and outputting three-phase voltage signals; a first... | 07/06/2010 |
| 7724555 | Power converter with synchronous rectification and digital current sharing Converters that employ synchronous rectification, such as DC/DC converters, are disclosed. These converters can control their synchronous rectifiers to selectively block or pass a negative current from flowing in their output lines. Also disclosed are converters whi... | 05/25/2010 |
| 7697310 | Control apparatus for inhibiting synchronous-rectifier switching elements at low output current for a voltage transforming apparatus The control apparatus for controlling a voltage transforming apparatus having a transformer, power switching elements disposed in a primary side, and synchronous-rectifying switching elements disposed in a secondary side includes a judging circuit making a judgment ... | 04/13/2010 |
| 7663898 | Switching power supply with direct conversion off AC power source A power supply circuit, comprising a first reverse blocking transistor coupled to an AC power line; a second reverse blocking transistor coupled to the AC power line; a first inductor provided between the first reverse blocking transistor and the AC power line and c... | 02/16/2010 |
| 7636249 | Rectifier circuit Disclosed is a method for operating a transistor as a rectifier element, and a circuit arrangement including a control circuit and a transistor. ... | 12/22/2009 |
| 7548442 | Power converter with coupled inductor A power converter has simple coupled inductor circuit process the power and drive the semiconductor switch perfectly to reduce the power loss and eliminate the needs of high circuit complexity controller, improve the conversion efficiency and reduce the component co... | 06/16/2009 |
| 7447051 | Synchronous multi-phase AC-to-DC converter Disclosed herein are various embodiments of power conversion systems and methods employing synchronous multi-phase AC-to-DC conversion. In one embodiment, a power converter comprises a transistor bridge and a switching controller that operates the transistor bridge ... | 11/04/2008 |
| 7440298 | Synchronous rectification circuit for power converters A synchronous rectification circuit for power converters operable under fixed and/or variable frequencies where no current sense circuit or phase-lock circuit are needed is provided. It has a power switch coupled to a transformer for the rectification. A signal-gene... | 10/21/2008 |
| 7440299 | Control of a MOS transistor as rectifying element A circuit for controlling a switch to be controlled in unidirectional fashion while the voltage present thereacross is an A.C. Voltage, including circuitry for delaying the switch turning-on with respect to a zero crossing of the voltage thereacross, and circuitry f... | 10/21/2008 |
| 7436684 | DC/DC-rectifier with reduced losses A DC/DC-rectifier includes a transformer and a primary side bridge. The primary side bridge comprises a first pair of switches and a second pair of switches, and a secondary side bridge also comprises a first pair of switches and a second pair of switches. The switc... | 10/14/2008 |
| 7408796 | Integrated synchronous rectifier package An integrated synchronous rectifier package comprising a controlled switching device having two main current carrying terminals and a control terminal, a control circuit for sensing the direction of current through the controlled switching device main current carryi... | 08/05/2008 |
| 7400519 | Switching power supply A switching power supply comprises one or more switching sections which repeat ON/OFF operation, a transformer having a primary winding and a secondary winding, a synchronous rectifier section for rectifying a voltage induced in the secondary winding when an input v... | 07/15/2008 |
| 7397290 | Method and relative circuit for generating a control voltage of a synchronous rectifier A control voltage for a synchronous rectifying transistor is generated with the desired anticipation time. The anticipation time is continuously controlled with a closed-loop technique by comparing it with the duration of a reference pulse. The resulting error signa... | 07/08/2008 |
| 7385832 | Method of forming a secondary-side controller and structure therefor In one embodiment, a secondary-side controller is configured to detect a burst-mode of operation and responsively block or prevent sending drive pulses to a power transistor that is coupled in the secondary side. ... | 06/10/2008 |
| 7375988 | Self-synchronized high voltage synchronous rectifier and drive This invention describes a method for using self-synchronized (also known as self-driven), synchronous rectifiers in converters employing high output voltages or conversely, in converters with wide input voltage ranges. ... | 05/20/2008 |
| 7372710 | Switching power source device of the type capable of controlling power loss in generating output voltage from a secondary winding of a transformer A switching power source device is provided which comprises a secondary MOS-FET 9 connected between a secondary winding 6 of a transformer 2, a reactor 11 connected in parallel to secondary winding 6 of transformer 2 for acc... | 05/13/2008 |
| 7372711 | Circuit and method for reducing voltage spikes due to magnetizing current imbalances and power converter employing the same For use in a power converter having parallel power trains, a circuit for, and method of, reducing voltage spikes due to magnetizing current imbalances in the power trains and a power converter incorporating the circuit or the method. In one embodiment, the circuit i... | 05/13/2008 |
| 7368777 | Accumulation device with charge balance structure and method of forming the same An accumulation-mode field effect transistor includes a plurality of gates and a semiconductor region having a channel region adjacent to but insulated from each of the plurality of gates. The semiconductor region further includes a conduction region wherein the cha... | 05/06/2008 |
| 7362595 | DC-DC converter A DC-DC converter includes a regeneration preventing circuit to bring a synchronous rectifying switching element to an OFF-state when an output of an error amplifier is lower than a lower-limit potential of a triangular-wave signal, that is, when the output of the e... | 04/22/2008 |
| 7362601 | Power supply device A power supply device includes two input ports, two output ports, a transformer having primary and secondary windings, a switch device, and a controller. The switch device includes a switching element connected in series with the primary winding, and a capacitor. Th... | 04/22/2008 |
| 7345896 | Secondary side power supply controller and method therefor In one embodiment, a power supply controller generates a PWM control signal that is subsequently used to control a portion of current flow in a primary side of a power supply system. THE PWM control signal is coupled to a secondary of the power supply system and use... | 03/18/2008 |
| 7342811 | Lossless clamp circuit for DC-DC converters A lossless clamping circuit for use in a synchronous rectifier DC-DC converter in which at least one transistor switch (MOSFET) periodically connects two terminals of an output transformer winding across a main output and return terminal to provide a DC current at a... | 03/11/2008 |
| 7339800 | Switching power source device of resonance type capable of controlling switching loss and noise A switching power source device of resonance type is provided which comprises an output voltage detector 18 for detecting output voltage on a load 13 to produce a detection signal; and a control circuit 2 for applying on-off signals Vg1 | 03/04/2008 |
| 7336509 | Method and apparatus for estimating line inductance for PWM rectifier control A rectifier includes a switching circuit and a controller. The switching circuit is coupled between positive and negative buses and a plurality of input voltage sources. The switching circuit includes a plurality of pairs of switching devices. Each pair is associate... | 02/26/2008 |
| 7333350 | Self driven synchronous rectifier shutdown circuit and method There is disclosed a power conversion circuit comprising a transformer having a primary side driven by an input section and a secondary side connected to first and second self-driven synchronous rectifiers. A shutdown section includes a control section adapted to de... | 02/19/2008 |
