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| Number | Title | Issue Date |
| 8184457 | Switch mode power supply for in-line voltage applications A switch mode power supply (15) employs a rectifier (20), a converter (50) and converter driver (60). The rectifier (20) generates a rectified supply voltage (VRS) based on an in-line voltage (VLN), and the co... | 05/22/2012 |
| 7859868 | Synchronous rectifier control circuit with deadtime adjustment to prevent crossover conduction A synchronous rectification control circuit is connected with a secondary-side rectification circuit and includes a driving circuit, a dead-time acquisition circuit, and a zero-voltage detection circuit. The driving circuit includes a differentiating circuit, a firs... | 12/28/2010 |
| 7586764 | Synchronized rectifier filter control device for protecting a power supply from reverse current A rectifier filter control device for a power supply that includes: A saturable inductor (swing choke), capacitors; and rectifiers connected to a rectifier filter circuit. The rectifier filter circuit further includes two electronic switches, which are respec... | 09/08/2009 |
| 7583521 | Over voltage clamp A clamp circuit for use in a DC/DC voltage converter having a first converter output including a first node and a second node, and a second converter output including a third node a fourth node. The clamp circuit includes a positive voltage output node coupled to th... | 09/01/2009 |
| 7529107 | Power supply and electronic ballast with voltage clamping circuit A circuit (20) for powering a load (50) includes a rectifier circuit (200), a voltage clamping circuit (300), and a DC-to-DC converter (400) such as a buck-boost converter. Voltage clamping circuit (300) is coupled between t... | 05/05/2009 |
| 7522432 | Switching regulator and control circuit and method used therein A switching regulator that performs voltage regulation using synchronous rectification in step-up and step-down modes includes input and output terminals, an inductor, first through fourth transistors, an overcurrent detection unit, and a control unit. The input ter... | 04/21/2009 |
| 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 |
| 7391194 | Apparatus and method for minimizing power loss associated with dead time Apparatus for minimizing power losses associated with dead time between ON times of two series connected switches of a power converter connected across a supply potential, the apparatus comprising a control arrangement for monitoring a selected parameter associated ... | 06/24/2008 |
| 7355866 | Method of detecting phase-loss state of three-phase power supply The disclosure relates to a method of detecting the phase-loss state of the three-phase power supply. When the phase-loss condition occurs in the input three-phase power supply of the power converter, it is determined whether the three-phase power source is in the p... | 04/08/2008 |
| 7352544 | Method and apparatus for providing a remedial strategy for an electrical circuit A method and electrical circuit for dynamic reconfiguration of a DC-to-AC inverter comprising first and second power rails where each the rails has a power source. The method comprises monitoring the first and second power rails for short-circuit failure; and upon f... | 04/01/2008 |
| 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 |
| 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 |
| 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 |
| 7336512 | Power convertor with low loss switching A welding power supply includes an input rectifier that receives sinusoidal or alternating line voltage and provides a rectified voltage. A pre-regulator provides a dc bus and a convertor, such as a boost convertor, provides a welding output. The pre-regulator is an... | 02/26/2008 |
| 7334141 | Method of saving energy in an information handling system by controlling a main converter based on the amount of power drawn by the system An information handling system having an energy saving power converter that comprises a main converter for supplying power to the information handling system when in active operation, and an auxiliary converter for supplying standby power to the information handling... | 02/19/2008 |
| 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 |
| 7330365 | Synchronous commutation DC-DC converter A synchronous commutation DC-DC converter comprises a current detection transformer (51) for detecting currents (IQ1, IQ2) flowing through the primary circuit, first and second DC bias power sources (53, 54) generating bias voltag... | 02/12/2008 |
| 7305311 | Arc detection and handling in radio frequency power applications A radio frequency power delivery system comprises an RF power generator, arc detection circuitry, and control logic responsive to the arc detection circuitry. A dynamic boundary is computed about the measured value of a parameter representative of or related to the ... | 12/04/2007 |
| 7283338 | Power supply device for low-voltage electronic residual current circuit breakers A power supply device for low-voltage electronic residual current circuit breakers includes an electronic rectifier stage suitable to receive in input a mains voltage and to generate a first unipolar voltage whose value depends on the value of the mains voltage, and... | 10/16/2007 |
| 7279862 | Fault handling of inverter driven PM motor drives An apparatus includes a multi-phase inverter, a fault detector to indicate a detection of a fault, a sensor to provide a speed signal indicative of whether a speed of a PM motor is greater than a transition speed, and a controller. The controller is operable to appl... | 10/09/2007 |
| 7266000 | Controlled inrush current limiter An improved inrush current limiting circuit provides continuous control of current delivered to a filter capacitor based on the charge state of the filter capacitor. ... | 09/04/2007 |
| 7245511 | Resistor dropper power supply with surge protection A power supply system and corresponding methodology is provided for providing a self-protected power supply for use with electronic electricity meters. The self-protecting features are provided, in part, through the use of surface mounted resistive components corres... | 07/17/2007 |
| 7245514 | Synchronous rectification circuit A synchronous rectification circuit of a switching power supply device where circuit elements such as rectification switch elements are protected when an abnormality occurs in an output of a transformer, wherein a (fault) detecting circuit detects an abnormality of ... | 07/17/2007 |
| 7233509 | Parallel operating system of DC-AC converters and controller IC therefor A multiplicity of synchronized inverters for driving a multiplicity of loads such as CCFLs that require high ac voltages are arranged in close proximity of the respective loads and controlled in phase. A frequency determination capacitor and a frequency determinatio... | 06/19/2007 |
| 7233776 | Low voltage microelectromechanical RF switch architecture According to one embodiment a microelectromechanical (MEMS) switch is disclosed. The MEMS switch includes a pulse generator to provide a low voltage source, a transformer coupled to the pulse generator to boost a voltage received from the pulse generator and a switc... | 06/19/2007 |
| 7227762 | Fine-tuning circuit for the winding voltage of a transformer A fine-turning circuit is used for adjusting the output voltage of a main transformer in an electrical power convert device and solving the problem of turns granularity of conventional transformers. The fine-turning circuit includes an auxiliary transformer having a... | 06/05/2007 |
| 7212418 | Synchronous rectifier control circuit A synchronous rectifier control circuit improves energy conversion efficiency and uses a signal produced by a secondary winding of a transformer in a rectifier circuit to control a low-impedance and a low power consuming current switch such as a JFET and a MOSFET in... | 05/01/2007 |
| 7209374 | Capacitor-input positive and negative power supply circuit There is provided a power supply circuit having a simple configuration which is capable of eliminating an adverse effect due to pumping operation. The capacitor-input positive and negative power supply circuit is comprised of diodes, switching circuits connected in ... | 04/24/2007 |
| 7200015 | Automatic capacitor discharge for power supplies In a DC power supply or a battery charger, plural output filter capacitors remain highly charged after the load is removed and the converter is turned off. A transistor connected across the capacitors is non-conductive during normal power supply operation and a blee... | 04/03/2007 |
| 7196913 | DC conversion apparatus A DC conversion apparatus includes a switch converting a DC voltage of a DC power source to a high-frequency voltage by being turned ON/OFF via a primary winding of a transformer, a series circuit of a switch and a clamp capacitor being connected to both ends of the... | 03/27/2007 |
| 7196482 | PWM controller with automatic low battery power reduction circuit and lighting device incorporating the controller A controller for controlling a voltage applied to a load from a power source includes a square wave producing circuit for connection in the circuit with the battery and the lamp. The square wave producing circuit produces a variable duty cycle square wave for contro... | 03/27/2007 |
| 7196892 | Method and apparatus for isolating RFI, EMI, and noise transients in power supply circuits A method and apparatus for isolating and/or eliminating RFI, EMI, and noise transients in power supply circuits. The circuit isolates DC to DC and AC to DC power coupling by use of dual, parallel current paths that are alternately gated. The gating of the switches i... | 03/27/2007 |
| 7187531 | Transient suppressor and power converter employing the same The present invention is directed to a transient suppressor, a method of suppressing a peak voltage associated with a rectifier, and a power converter employing the same. In one embodiment, the transient suppressor includes a saturable reactor circuit interposed bet... | 03/06/2007 |
| 7164242 | Variable speed drive for multiple loads A variable speed drive is provided having a converter to convert an AC voltage to a DC voltage, a DC link to filter and store energy from the converter, and a plurality of inverters, wherein each inverter is configured to convert a DC voltage to an AC voltage to pow... | 01/16/2007 |
| 7151362 | Uniform converter output voltage distribution power system A uniform converter output voltage distribution power system evenly controls the individual output voltages of DC-to-DC parallel-input series-output connected converters using a uniform output voltage distribution controller including a generator for generating resp... | 12/19/2006 |
| 7143016 | System and method for dynamic multi-objective optimization of pumping system operation and diagnostics Control systems and methodologies are disclosed for controlling a process having one or more motorized pumps and an associated motor drives, which comprise selecting a desired operating point within an allowable range of operation about a process setpoint according ... | 11/28/2006 |
| 7130205 | Impedance source power converter An impedance source power converter includes a power source, a main converter circuit and an impedance network. The main converter circuit is coupled to a load and the impedance network couples the power source to the main converter circuit. The impedance network is... | 10/31/2006 |
| 7130203 | Switching power supply with a snubber circuit A DC/DC power supply with two transformers (10, 20), which for example are connected in parallel on the primary and in series on the secondary side, comprises two passive, non-dissipative snubber circuits (1.1, 1.2). Each snubber circuit comprises a se... | 10/31/2006 |
| 7116563 | Dual mode over-current protection for switching mode power converter A control circuit for a switched mode power converter is adapted to receive a current sense signal reflecting the output current of the power converter and a feedback signal reflecting the output voltage of the power converter. The control circuit includes a first o... | 10/03/2006 |
| 7104686 | Radiographic apparatus A radiographic apparatus includes a detection section including photoelectric conversion elements that detect radiation that has been transmitted through a subject. The apparatus has a substantially rectangular detection surface; and a housing that contains the dete... | 09/12/2006 |
