Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 8111531 | Interleaved soft switching bridge power converter An interleaved soft switching bridge power converter comprises switching poles operated in an interleaved manner so as to substantially reduce turn-on switching losses and diode reverse-recovery losses in the switching pole elements. Switching poles are arranged int... | 02/07/2012 |
| 8102687 | Control apparatus for controlling power conversion apparatus The control apparatus is for controlling a power conversion apparatus with a chopper circuit including at least one voltage-controlled type switching element provided with a drive circuit, and a coil to generate back electromotive force. The control apparatus includ... | 01/24/2012 |
| 8094474 | Drive controller for power conversion circuit A drive controller is provided, for controlling driving of a power conversion circuit. The power control circuit includes a switching element for increasing/decreasing an absolute value of current passing through a coil by repeating electrical ON/OFF operation, so t... | 01/10/2012 |
| 8094475 | Inverter with asymmetric clocking and thermally isolated modules On an inverter for feeding power of a direct voltage source, in particular of a photovoltaic generator (PVG), into an alternating voltage mains (N), with an asymmetrically clocked bridge circuit with at least two first switches (S1, S2) clocked at main... | 01/10/2012 |
| 8085565 | Vehicle inverter for powering consumer electronic devices An inverter for inverter DC power, such as but not limited to the type commonly employed in vehicle power systems, in to AC power, such as but not limited to the type commonly employed to power consumer electronic devices. The inverter may be configured to electrica... | 12/27/2011 |
| 8077491 | Inverter controller A PWM operation unit includes a modulation-mode selecting unit selecting a two-phase modulation mode signal and a carrier-wave-synchronous-mode select command, a modulation-wave generating unit generating a modulation wave in response to the two-phase modulation mod... | 12/13/2011 |
| 8040706 | Sine wave lamp controller with active switch commutation and anti-flicker correction A pulse width modulated half bridge dimming controller for dimming a lighting ballast is described. The top half of the bridge is comprised of two switches, the top switch set, and the bottom half of the bridge is comprised of two switches, the bottom switch set. Ea... | 10/18/2011 |
| 8023297 | High efficiency photovoltaic inverter A photovoltaic (PV) inverter includes a single DC to AC converter configured to operate solely in a buck mode for PV array voltage levels greater than a connected power grid instantaneous voltage plus converter margin, and further configured to operate solely in a b... | 09/20/2011 |
| 7990745 | Apparatus for controlling H-bridge DC-AC inverter The present invention discloses an apparatus for controlling an H-bridge DC-AC inverter, comprising an H-bridge DC-DC converting circuit capable of converting unstable DC power into stable DC power and a full-bridge DC-AC inverting circuit capable of inverting DC po... | 08/02/2011 |
| 7961487 | Power converter device A power module having three unit power modules and a control circuit board including a gate drive circuit are set up side by side and mounted on a heat exchanger. A pair of positive and negative direct current terminals for connecting the smoothing capacitor and a p... | 06/14/2011 |
| 7957168 | Inverter An inverter (1) for feeding electric power into a utility grid (7) or into a load is described. The inverter (1) contains two direct voltage inputs (2, 3), one first intermediate circuit (8) connected thereto and comprising two ser... | 06/07/2011 |
| 7957167 | Semiconductor element drive device with level shift circuit and apparatus including the same A high-reliability IGBT drive device in which the high- and low-voltage side IGBTs are complementarily ON/OFF controlled before and after dead time. A reset pulse that turns OFF the high-voltage side IGBT is generated during the dead time as described in the followi... | 06/07/2011 |
| 7894224 | Voltage drive system with hysteretic current control and method of operating the same A voltage drive system is provided having a plurality of modulators and a plurality of cascaded switching circuits which collectively generate a single-phase output signal to a load. Each modulator receives a phase current error and has an adder which generates a mo... | 02/22/2011 |
| 7889529 | Power converter In a bridge type power converter including series connectors of power semiconductor switches having first and second main terminals and a control terminal; plural steps of the series connectors connected in parallel, a gate drive circuit for limiting voltage between... | 02/15/2011 |
| RE42039 | DC to AC inverter with single-switch bipolar boost circuit This invention improves the performance and lowers the cost of DC to AC inverters and the systems where these inverters are used. The performance enhancements are most valuable in renewable and distributed energy applications where high power conversion efficiencies... | 01/18/2011 |
| 7869236 | Carrier-based pulse-width modulation (PWM) control for matrix converters A matrix converter includes a plurality of switches that electrically connect a multi-phase input voltage source to a multi-phase load; and a controller to output pulse-width modulated (PWM) switching signals to control the switches to produce a multi-phase output v... | 01/11/2011 |
| 7869237 | Phase-shifted bridge with auxiliary circuit to maintain zero-voltage-switching A phase-shifted PWM dc-to-dc converter includes a pair of switched half-bridges defining taps. The primary of an output transformer is coupled across the taps to receive AC, and produces transformed AC which is rectified and filtered to produce the output dc. Zero-v... | 01/11/2011 |
| 7843714 | Inverter, more specifically for photovoltaic plants On an inverter (1) for converting an electric direct voltage, in particular of a photovoltaic direct voltage source into an alternating voltage with a direct voltage input with two terminals (DC+, DC−) and one alternating voltage output with two terminals (... | 11/30/2010 |
| 7835166 | Method for controlling a polyphase converter with distributed energy stores The invention relates to a method for controlling a power converter comprising at least two phase modules, each of which is provided with an upper and a lower valve leg that is equipped with at least two serially connected bipolar subsystems, respectively. According... | 11/16/2010 |
| 7817452 | Phase shifted H-Bridge resonant converter with symmetrical currents A phase shifted H-bridge resonant converter with symmetrical currents includes, a DC storage cap (31), four switches (1-4) with a parallel turn off network consisting of diodes (5-8), capacitors (9), (11), (14)... | 10/19/2010 |
| 7813152 | Power converter To provide a power converter, comprising: a pair of main circuit switching elements to which diodes are connected; a means for generating a first PWM basic signal for driving a main circuit switching element; and a reverse voltage application circuit to be operated,... | 10/12/2010 |
| 7800928 | Method of operating a resonant inverter using zero current switching and arbitrary frequency pulse width modulation A method of controlling a series-resonant, half-bridge inverter includes turning off the bottom switch and turning on the top switch the inverter when the current through the resonant inductor crosses the zero axis while the current is increasing, thereby insuring z... | 09/21/2010 |
| 7791915 | Electric converter for fuel cell The invention concerns an electric converter for fuel cell (P) comprising current inverter means (2), the electric converter comprising a voltage step-down chopper (1) mounted between the fuel cell (P) and the current inverter means (2), wherein... | 09/07/2010 |
| 7773400 | Inverter driving circuit an inverter control circuit A phase adjusting circuit is provided that is capable of adjusting a delay time at a rise or fall of a driving signal for driving an inverter. A phase adjusting circuit is provided upstream of a driver circuit, and an output from a hysteresis comparator is input to ... | 08/10/2010 |
| 7724556 | Power converter There are provided: sets of pairs of main circuit switching elements (4u), (4x) that supply power to a load, connected in series with a DC power source; free-wheel diodes (5u), (5x) connected in anti-parallel w... | 05/25/2010 |
| 7706163 | Three-level AC generating circuit and control method thereof The present invention provides a three-level ac generating circuit and the control method thereof. The three-level ac generating circuit includes a three-level boosting circuit connected to an input source and including a positive boosting portion and a negative boo... | 04/27/2010 |
| 7701738 | Supply unit for a driver circuit and method for operating same A power supply and method of operating the same. The method includes the steps of: operating first and second switches to an “On” position; operating said first switch to a “Off” position, causing a flow of a first free-wheeling current through a first free-... | 04/20/2010 |
| 7688608 | Reference voltage change in a digital power supply An example disclosed method to handle a reference voltage change in a digital power supply includes receiving a first value associated with a first reference voltage having a first voltage magnitude at a digital signal processor of a digital power supply, comparing ... | 03/30/2010 |
| 7684222 | Power conversion apparatus with DC bus precharge circuits and methods of operation thereof A power conversion apparatus, such as a UPS, includes a DC link including first and second DC busses and a reference bus and a DC generator circuit coupled to the DC link and operative to generate first and second DC voltages with respect to the reference bus on res... | 03/23/2010 |
| 7675764 | Power converter employing integrated magnetics with a current multiplier rectifier and method of operating the same A power converter having input and output nodes and a method of operating the same. In one embodiment, the power converter includes a switching circuit including first, second and third active phase legs. Each of the first, second and third active legs includes a fi... | 03/09/2010 |
| 7667991 | Sine wave lamp controller with active switch commutation and anti-flicker correction A pulse width modulated half bridge dimming controller is provided for dimming a lighting ballast is described. The top half of the bridge is comprised of two switches, the top switch set, and the bottom half of the bridge is comprised of two switches, the bottom sw... | 02/23/2010 |
| 7663899 | Active compensation device The present invention provides an active compensation device that is connected between a power system and a non-linear load in parallel for providing an instantaneous compensation current for the non-linear load. The active compensation device comprises an electrici... | 02/16/2010 |
| 7652901 | High frequency excitation system A power module is adapted to be connected to a voltage source and to supply power to a load. The power module includes a power transistor; and a gate controller for driving the power transistor. The gate controller includes a gate transformer, and an impulse generat... | 01/26/2010 |
| 7652900 | Inverter type AC generator with a zero-crossing detection circuit used to provide a synchronized operation and method of operating the same An inverter type AC generator includes an inverter circuit converting a DC output into AC output of a predetermined frequency and supplying the AC output to a load via a load line in order to improve the quality of an AC output waveform at least in parallel operatio... | 01/26/2010 |
| 7619910 | Interleaved soft switching bridge power converter An interleaved soft switching bridge power converter comprises switching poles operated in an interleaved manner so as to substantially reduce turn-on switching losses and diode reverse-recovery losses in the switching pole elements. Switching poles are arranged int... | 11/17/2009 |
| 7616466 | Three phase inverter with improved loss distribution An inverter circuit couples a DC voltage source having a primary side and a reference side to an electric motor or other AC machine having multiple electrical phases. An inverter circuit includes switches, diodes and a controller. For each of the electrical phases, ... | 11/10/2009 |
| 7616467 | Circuit apparatus for transformerless conversion of an electric direct voltage into an alternating voltage In a circuit apparatus for transformerless conversion of an electric direct voltage of a two-pole direct voltage source (1) connected to ground having a first voltage pole (+) and a second voltage pole (−) into an alternating voltage, hazardous capacitive l... | 11/10/2009 |
| 7606053 | DC-to-DC converter and electric motor drive system using the same A DC-to-DC converter is provided and generally configured for implementation with an electric motor drive system. In at least one embodiment, the DC-to-DC converter includes first and second capacitors, an inductor, and first and second switching devices. The DC-to-... | 10/20/2009 |
| 7599203 | Power semiconductor device A power semiconductor device M includes: first and second frames for feeding unipolar power from outside; first and second switching units which are series-connected between the first and second frames; an output frame for outputting AC power which is generated by c... | 10/06/2009 |
| 7589987 | DC-to-DC converter with improved transient response A DC to DC converter includes a comparator, a driver, and a pair of switches. The comparator compares the output voltage with a reference voltage signal and generates a PWM signal. The driver drives the switches so as to force the output voltage to follow the refere... | 09/15/2009 |
