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| Number | Title | Issue Date |
| 8054654 | Electrically insulated switching element driver and method for controlling same An electrically insulated switching element driver includes: a pulse transformer driving unit into which a switching element driving signal and a duty signal are input and which drives, in accordance with the duty signal, a first or second pulse transformer that is ... | 11/08/2011 |
| 8009444 | Boost device for voltage boosting A boost device boosts an input voltage to an output voltage across an output capacitor, and includes an output diode coupled to the output capacitor, and a transformer coupled to a first switch, a clamp circuit and a boost circuit. The clamp circuit is coupled acros... | 08/30/2011 |
| 7889520 | DC-DC converter and transformer A DC-DC converter using a plurality of transformers capable of decreasing the loss, preventing heat generation of transformers, and improving the heat transfer property of the core, and an integrated type transformer used in this DC-DC converter. A terminal T1 | 02/15/2011 |
| 7733671 | Switching regulators A switching regulator. A pulse width modulation (PWM) unit comprises an output stage and generates a PWM driving signal to control the output stage, such that an inductor delivers an inductor current signal to the load, and a slope compensation unit outputs a slope ... | 06/08/2010 |
| 7596003 | Electric power converter A control circuit for controlling a subsidiary (high-side) switching device in an insulating electric power converter having a half-bridge structure includes a first series circuit of a resistor and a diode, a second series circuit of a resistor and a diode, and a t... | 09/29/2009 |
| 7548436 | Driving circuit and a power converter incorporating the same A power converter includes: a transformer controlled by a main switch to receive an input power according to a driving signal; a switching circuit outputting a sync signal; and a driving circuit including a dead time controller that includes first and second switche... | 06/16/2009 |
| 7532489 | Power factor correction power supply Provided herein is a power factor correction (PFC) power supply, comprising: a bridge rectifier having an input and an output, a filter capacitor connected to the output of the bridge rectifier, a transformer having a primary winding, a fly-back winding and a second... | 05/12/2009 |
| 7499293 | High voltage pulse power circuit A pulse power source comprises a first circuit, a second circuit, a transformer for coupling the first circuit and the second circuit, and a switching controller. The second circuit comprises a third semiconductor switch connected in series with a secondary winding ... | 03/03/2009 |
| 7439717 | Secondary side post regulators A synchronously switched buck post regulator is revealed for multi-output forward converters. The synchronously switched buck post regulator accomplishes precise independent load regulation for each output and reduced magnetics volume by using a coupled inductor wit... | 10/21/2008 |
| 7432694 | Systems and methods for sensed current-mode feedback in switching regulators Various systems and methods for implementing feedback in a switching regulator are disclosed. For example, various current feedback circuits are disclosed that include a current feedback node and a sense node. In addition, the current feedback circuits include an op... | 10/07/2008 |
| 7423889 | Forward converter with synchronous rectification A commutation switch turning-on control switching element is controlled with a voltage generated at a fourth coil (auxiliary coil) of a main transformer and controls application of a control voltage to a control terminal of a commutation switching element. A commuta... | 09/09/2008 |
| 7423888 | Voltage conversion circuit and switching power supply device A voltage conversion circuit and a switching power supply device achieving both a good response and a low loss of a power supply voltage, wherein a main voltage conversion portion (circuit block) for conversion an AC voltage to a DC voltage, an auxiliary voltage con... | 09/09/2008 |
| 7405951 | Switching power supply device A switching power supply includes: a first series circuit, connected to both terminals of a direct current power supply Vdc1, in which a primary winding 5a of a transformer T, a reactor L3 and a first switch Q1 are connected in ser... | 07/29/2008 |
| 7405952 | Power supply device A power supply device has first and second terminals, a transformer, a switching element and an auxiliary power supply element. The first and second terminals receive input power having an input voltage. The transformer has a primary winding and a secondary winding.... | 07/29/2008 |
| 7403402 | Method and apparatus for extending the operating range of a flyforward converter A technique for extending the operating range of a flyforward converter to low input voltages. In one aspect, power converter includes a positive input supply rail and a negative input supply rail. A power converter input voltage is to be applied between the positiv... | 07/22/2008 |
| 7394668 | Switching power supply circuit and frequency converter An object of the present invention is to lower the voltage applied to the starting resistor of the starting circuit in a switching power supply circuit to reduce the power loss especially when the receiving voltage is high and thereby provide a small and inexpensive... | 07/01/2008 |
| 7391626 | Chop wave control circuit A chop-wave control circuit includes a feedback unit, a ramp generation unit, a latchup unit and a voltage transformation unit that is used on a forward transformation circuit which includes at least a main output unit and at least one auxiliary output unit. The fee... | 06/24/2008 |
| 7385831 | Power supply device and vehicle lamp A power supply device includes: a regulator transformer; a primary switch for selectively supplying a current to the regulator transformer; a control circuit for reducing to 0, following each election made at the primary switch, the minimum value of a current output... | 06/10/2008 |
| 7382633 | DC converter A DC converter includes a time difference detector to detect a time difference between a point around which a main switch provides a minimum voltage after an auxiliary switch turns off and a point at which the main switch turns on, an integrator to integrate the out... | 06/03/2008 |
| 7365518 | Ion engine power supply A power supply for an ion engine comprises a multiphase alternator and a power converter comprising a voltage multiplier coupled to each phase of the alternator. Each voltage multiplier comprises one or more staged voltage doublers. The alternator phases may be coup... | 04/29/2008 |
| 7355867 | Power supply for an electric meter having a high-voltage regulator that limits the voltage applied to certain components below the normal operating input voltage Disclosed is an invention relating to a power supply for use in an apparatus for measuring electrical energy, comprising, in one embodiment, a first switching device, a device for storing electrical charge in electrical connection with the first switching device, a ... | 04/08/2008 |
| 7355868 | Current sense method for bridgeless boost (BLB) PFC circuit using single current transformer A circuit and method for improving current sensing in a bridgeless PFC boost converter. Such a converter comprises a current transformer having first and second primaries; a boost inductor having a first end connected to a first AC input terminal and a second end co... | 04/08/2008 |
| 7352136 | DC-DC converter with reduced surge voltage and an electronic ballast including the converter for a discharge lamp A DC-DC converter reduces a surge voltage developed across a switching element (30) in making the voltage conversion with the use of a transformer (20) inherently having considerable leakage. A snubber circuit is included to absorb the surge energy and... | 04/01/2008 |
| 7342365 | Systems and methods for reducing input current in photoflash chargers A circuit for charging a photoflash that preferably reduces the average input to the switching regulator in an efficient fashion is provided. The regulator includes a transformer. The transformer includes a primary winding and a secondary winding. The switchi... | 03/11/2008 |
| 7343137 | Circuit, switching module comprising the same, and use of said switching module The invention relates to a circuit comprising an antenna input (1), a signal input (2) and a signal output (3), and a switching unit (4), wherein the antenna input (1) is connected to a first protection device (6) against el... | 03/11/2008 |
| 7342362 | Full-bridge soft switching inverter and driving method thereof A full-bridge soft switching inverter and a driving method thereof, using zero-voltage switching and conducting a circular current in a circuit including two n-channel MOSFET's so as to drive at least one load such as a cold cathode fluorescent lamp (CCFL) and a sig... | 03/11/2008 |
| 7339804 | DC-DC converter A DC-DC converter of the present invention includes: an activation circuit which activates a control circuit for controlling a turning on and off of a switching element; a second rectifying and smoothing circuit which supplies an output voltage, as a power supply, t... | 03/04/2008 |
| 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 |
| 7333351 | Electronic circuit control element with tap element A technique for controlling a power supply with power supply control element with a tap element. In one embodiment, a power supply regulator includes a power transistor having first, second, third and fourth terminals. A control circuit is included, which is coupled... | 02/19/2008 |
| 7330366 | DC-AC converter A DC-AC converter is applicable for transforming direct current (DC) to alternating current (AC). The DC-AC converter includes a voltage boost module and a DC-AC converter module. Herein the voltage boost module includes a voltage bypass circuit and a voltage boost ... | 02/12/2008 |
| 7330359 | Power supply unit The present invention is directed to a power supply unit that provides large power supply to the load. The voltage detector 51 generates a voltage detection signal by detecting the voltage generated at the output terminals 21, 22. The current detector ... | 02/12/2008 |
| 7321499 | Method of forming a power supply controller and device therefor In one embodiment, a power supply controller uses a ramp signal to form current sense ramp compensation. ... | 01/22/2008 |
| 7321498 | DC-DC converter having synchronous rectification without cross conduction An apparatus (54) is provided for preventing cross conduction in a synchronous rectifier of a DC-DC converter (10). The DC-DC converter has an input MOSFET switch (26) coupled to primary windings (22) of an isolation transformer (20 | 01/22/2008 |
| 7310247 | Method for controlling transformer excitation cycles and circuit for controlling the same The present invention discloses a method for controlling transformer excitation cycles and a circuit for controlling the same, wherein the excitation cycle and the demagnetization cycle, which determine the rise and fall of the excitation current, are modified to pr... | 12/18/2007 |
| 7310246 | Capacitor charging circuit and strobe apparatus comprising same A capacitor charging circuit does not include a Zener diode and makes it possible to integrate a large number of circuits and elements within a semiconductor integrated circuit. The capacitor charging circuit includes a flyback transformer having a primary coil, a s... | 12/18/2007 |
| 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 |
| 7295097 | Energy saving system for a unit requiring electricity An electrical energy saving device or a magnetic induction device is adapted to surround a power delivery line. The magnetic induction device applies a magnetic field region to the power delivery line to reduce amperage up to about 25%. The magnetic induction device... | 11/13/2007 |
| 7294978 | Efficient lighting A method for efficient lighting includes supplying power to a light source to control the intensity of light emitted from the light source according to an intensity waveform. The amplitude of the waveform over one period is at a high level for a first time interval ... | 11/13/2007 |
| 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 |
| 7292463 | DC-AC converter and controller IC therefor A semiconductor switch circuit is connected to a primary winding of a transformer having a secondary winding connected to a load. The semiconductor switch circuit has switches controlled by PWM to provide a controlled constant current. In the inventive inverter, con... | 11/06/2007 |
