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| Number | Title | Issue Date |
| 8018744 | Power factor correction by measurement and removal of overtones A power factor correction circuit (42/44) responsive to an input power supply signal at an input supply voltage (VAC) that varies largely sinusoidally with time at a fundamental supply frequency contains regulator/control circuitry (60, 62, ... | 09/13/2011 |
| 7894218 | Switch-mode converter A switch-mode converter. One embodiment provides an inductive energy storage element. A rectifier arrangement is coupled to the inductive energy storage element for providing an output voltage. A switching arrangement regulates the inductive energy storage element o... | 02/22/2011 |
| 7839664 | AC to DC power supply having zero frequency harmonic contents in 3-phase power-factor-corrected output ripple An AC-DC power supply circuit utilizing an output stage configuration designed to achieve no output ripple at the power line frequency. To eliminate the ripple formed, each separate processing output stage corresponding to a respective ac voltage source phase which ... | 11/23/2010 |
| 7719862 | Power factor correction by measurement and removal of overtones A power factor correction circuit (42/44) responsive to an input power supply signal at an input supply voltage (VAC) that varies largely sinusoidally with time at a fundamental supply frequency contains regulator/control circuitry (60, 62, ... | 05/18/2010 |
| 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 |
| 7382112 | Methods and devices for input waveform control in switching power supplies The invention recognizes that filter size can be reduced substantially as power factor is permitted to deviate below unity in systematic ways. Preferred methods of the invention provide specific, computable waveforms that permit use of a minimum filter size given a ... | 06/03/2008 |
| 7365998 | Unregulated isolated DC/DC converter with ripple control An unregulated isolated DC/DC converter is configured to receive an input signal and to provide an output signal. A ripple control circuit is coupled to the unregulated isolated DC/DC converter, wherein the ripple control circuit is configured to reduce an amount of... | 04/29/2008 |
| 7342372 | Method for power control of an electric motor The invention relates to a method for power control of an electric motor, in particular a motor for driving the suction fan of a vacuum cleaner connected to an AC mains power supply. The power control is effected by varying the phase angle of the electric alternatin... | 03/11/2008 |
| 7315150 | Method of power conversion and apparatus which achieves high power factor correction using ripple current mode control A ripple current mode power converter comprised of a magnetic energy storage element, and a method of determining magnetic storage element charge duration based on periodic magnetic storage element current samples. In the preferred embodiment a controller processes ... | 01/01/2008 |
| 7285919 | Electronic ballast having improved power factor and total harmonic distortion An electronic ballast for driving a gas discharge lamp includes a rectifier, a valley-fill circuit, an inverter having first and second series-connected controllably conductive switches having complementary duty cycles, a control circuit for controlling the controll... | 10/23/2007 |
| 7282984 | Semiconductor device having an internal voltage converter, and method therefor An internal voltage converter and method is provided capable of reducing power consumption using a selective voltage reference, a semiconductor device including the internal voltage converter. A semiconductor device uses the internal voltage converter which discrimi... | 10/16/2007 |
| 7274579 | Converter circuit and motor driving apparatus A converter circuit for converting an output voltage from an AC power supply includes a rectifier circuit for rectifying the output voltage of the AC power supply; first and second capacitors connected in series, for smoothing the output of the rectifier circuit; an... | 09/25/2007 |
| 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 |
| 7236380 | Rectifier system having different rectifier elements A rectifier system, in particular a rectifier bridge for a three-phase generator, includes a plurality of rectifier elements, specifiable rectifier elements being different from the other rectifier elements in at least one property. The rectifier elements are, for e... | 06/26/2007 |
| 7233506 | Low kVA/kW transformers for AC to DC multipulse converters A polygon connected autotransformer in conjunction with zero sequence blocking inductor(s) enables multipulse AC to DC converters to use lower kVA parts rating by using appropriate phase-shifted voltage sets in conjunction with inductors that extend the conduction p... | 06/19/2007 |
| 7221111 | Switching power supply device and method of controlling the switching device According to one embodiment, the switching power supply device comprises a DC-DC converter, an alternating current driver circuit, a smoothing capacitor and control circuitry. The control circuitry operates for adjusting a phase of an oscillation signal from the alt... | 05/22/2007 |
| 7184287 | Rectifier clamping circuit with reverse energy recovery An energy-feedback clamping circuit of a power converter is proposed. The converter includes a transformer coupled to a full-wave rectifier circuit. The clamping circuit includes: two clamping diodes having two anodes coupled to each other at a common-anode terminal... | 02/27/2007 |
| 7162397 | Decoding an alternator output signal An engine diagnostic system is provided that enables a service technician to evaluate engine cylinder contribution to output power. The service technician couples one or more signal leads to the vehicle's battery, alternator, or accessory receptacle (e.g., cigarette... | 01/09/2007 |
| 7142779 | Infrared sauna A portable compact sauna wherein a user's body is warmed to sweating primarily by direct absorption of infrared radiation. Broad infrared radiation emitters or sources are placed around the inside of a narrow cabinet so as to be in close proximity to various parts o... | 11/28/2006 |
| 7140528 | Surgical stapling instrument having an electroactive polymer actuated single lockout mechanism for prevention of firing A surgical instrument includes an E-beam firing bar engages the channel and selectively engages the anvil during distal firing movements, wherein the tissue is severed and stapled driven upward from the staple cartridge to form against the anvil. In particular, a we... | 11/28/2006 |
| 7120353 | Infrared sauna A portable compact sauna wherein a user's body is warmed to sweating primarily by direct absorption of infrared radiation. Broad infrared radiation emitters or sources are placed around the inside of a narrow cabinet so as to be in close proximity to various parts o... | 10/10/2006 |
| 7106012 | Electronic control unit, electric power-assisted steering device and transmission ratio-variable steering unit An electronic control unit for producing a sufficiently boosted voltage even when a supply voltage becomes high includes an inverter that drives switching elements and converts a DC voltage into an AC voltage, and booster means which boosts a DC voltage that is inpu... | 09/12/2006 |
| 7102343 | Methods and systems having multiple cooperating transformers Disclosed are methods, systems, and devices that include a power source having a first voltage having a first frequency, a power-consuming load(s), and a first transformer set comprising a delta-delta transformer and a first voltage controller coupled in series ther... | 09/05/2006 |
| 7078652 | Method and apparatus for welding with high frequency protection A method and apparatus for providing welding-type power is disclosed. The power supply has two output lines, and two inductances that are magnetically coupled, or a common mode inductance, in the output lines. The inductances may be installed when the power supply i... | 07/18/2006 |
| 7075268 | System and method for increasing output horsepower and efficiency in a motor A system and method are provided to increase the horsepower of an induction motor. One technique for increasing the horsepower of a motor is to connect the motor to a variable speed drive that is providing an output voltage and frequency greater than the standard li... | 07/11/2006 |
| 7061195 | Global closed loop control system with dv/dt control and EMI/switching loss reduction A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides ... | 06/13/2006 |
| 7054173 | Circuit with DC filter having a link fuse serially connected between a pair of capacitors A circuit that includes a filter and a DC bus is provided that reduces the potential for failure of a second capacitor of the filter in the event a first capacitor shorts. The filter is electrically connected across the DC bus and includes serially connected capacit... | 05/30/2006 |
| 7049774 | Apparatus for controlling power factor compensation in inverter control circuit and method thereof The present invention provides an apparatus for controlling power factor compensation and method thereof, in which a turn-on timing point of a power factor compensation switch is delayed by a prescribed time from a zero crossing timing point to enhance a power facto... | 05/23/2006 |
| 7027957 | Current interrupter assembly A method for determining the influence of one of a plurality of cathodic protection circuits along a pipeline includes switching one of a plurality of cathodic protection circuits off, while the remainder of the plurality of cathodic protection circuits are left on,... | 04/11/2006 |
| RE39060 | Power supply device and air conditioner using the same This invention provides a power supply device capable of widening a conduction period of an input current by a simple control to improve a power factor, and reducing a harmonic distortion of the input current The power supply device comprises a rectifier circuit, a ... | 04/11/2006 |
| 7023714 | Voltage converter for a power supply A SEPIC type voltage converter (101) comprises a transformer (40) having a primary winding (41) and a storage capacitor (33) connected in series, and a controllable switch (51) coupled in parallel with said series combination. The ... | 04/04/2006 |
| 7016205 | Ripple-current reduction schemes for AC converters An AC ripple current reduction circuit for an AC converter having: an AC voltage source at the input; a first capacitor across which the circuit output voltage is provided; a first, main inductor in series with the first capacitor and the input; an auxiliary circuit... | 03/21/2006 |
| 7012413 | Controller for a power factor corrector and method of regulating the power factor corrector A controller for use with a current-controlled frequency-modulated power factor corrector having a power switch therein, and a method of regulating the same. In one embodiment, the controller includes a sensing circuit configured to detect a sense current that is re... | 03/14/2006 |
| 6992904 | Power converter module with a voltage regulating circuit A power converter module provides a regulated direct current voltage to a load, and includes a rectifier, a metal thin film capacitor, and a voltage regulating circuit. The rectifier has input rectifier terminals coupled electrically to an external alternating curre... | 01/31/2006 |
| 6980445 | Power factor improving converter and control method thereof A boost quantity detecting section (103) detects a boost quantity of an inductor (L11). An operational amplifier (113) of a control section (106) compares the boost quantity detected by the boost quantity detecting section (103) wi... | 12/27/2005 |
| 6958463 | Heater with simultaneous hot spot and mechanical intrusion protection An electrical heater utilizes negative temperature coefficient material (NTC) and current imbalance between live and neutral ends of the heater to simultaneously protect the heater from the hot spot and mechanical intrusion into the heating cable. The NTC layer, sep... | 10/25/2005 |
| 6768280 | Motor control apparatus A motor control apparatus includes a fundamental wave current control system that controls a fundamental wave component of a motor current in an orthogonal coordinate system and a higher harmonic current control system that controls a higher harmonic component conta... | 07/27/2004 |
| 6614197 | Odd harmonics reduction of phase angle controlled loads The present invention relates generally to the reduction of odd harmonics of phase angle controlled loads. One embodiment relates to an apparatus for reducing odd harmonic currents introduced into an alternating current (AC) supply by a load having a zero... | 09/02/2003 |
| 6469918 | Solid state cathodic protection systems, methods for making and using same A cathodic corrosion inhibiting apparatus is disclosed which is characterized by outputting a substantially square-wave rectified output from a AC input. The square-wave rectified output has a substantially constant DC component and a minimal AC component... | 10/22/2002 |
| 6462973 | A.C./D.C. converter that automatically adapts to the amplitude of the supply voltage An A.C./D.C. converter including a filtering capacitor and further including a first branch essentially including a first rectifying circuit and a current limiting circuit; a second branch essentially including a second rectifying circuit, the series volt... | 10/08/2002 |
