Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 8422260 | Arrangement for voltage conversion An arrangement for converting direct voltage into alternating voltage and conversely has a Voltage Source Converter with at least one phase leg connected to opposite poles (5, 6) of a direct voltage side of the converter and a series connection of switching c... | 04/16/2013 |
| 8406024 | Power convertion circuit using high-speed characteristics of switching devices A power conversion circuit converting DC electric power into AC electric power and sending the AC power to an inductive load, includes a first switching device connected to the positive pole side of the DC power supply to exhibit a conductive state and an interrupte... | 03/26/2013 |
| 8400801 | Wireless power transfer terminal This disclosure provides a wireless power transfer terminal that enables a power device to be used for both power transmission and power reception and allows space savings of circuits and a reduction in the cost of manufacturing. The wireless power transfer terminal... | 03/19/2013 |
| 8395919 | Photovoltaic inverter system and method of starting same at high open-circuit voltage A power inverter system includes a DC to AC inverter configured to convert DC voltage from a DC power source to AC voltage. A DC link couples the DC power source and the inverter. An inverter pre-charger operates to pre-charge the inverter to achieve a desired DC li... | 03/12/2013 |
| 8385097 | Method for controlling a voltage source converter and a voltage converting apparatus In a method for controlling a Voltage Source Converter having at least one phase leg comprising a series connection of switching elements, in which each said element has at least two semiconductor devices of turn-off type, at least two free-wheeling diodes connected... | 02/26/2013 |
| 8374011 | Method and apparatus for boosting DC bus voltage A power converter includes at least two power conversion sections operating in parallel. The power converter receives a variable input power and generates an AC output voltage. When the power source is generating enough power to supply a DC voltage to the power conv... | 02/12/2013 |
| 8363440 | Power conversion circuit having off-voltage control circuit In a power conversion circuit operating with high frequency, an off-voltage control circuit 101u of a lower-arm gate drive circuit 24u controls the output voltage of a gate drive power supply 103u to change the output voltag... | 01/29/2013 |
| 8238130 | Low-mass, bi-directional DC-AC interface unit A DC-AC converter includes a DC-DC converter providing bi-directional conversion between a first DC power signal and a second DC power signal, the first DC power signal being on a first DC bus and the second DC power signal being on a second DC bus. The DC-AC conver... | 08/07/2012 |
| 8213203 | Method and apparatus for controlling a constant current output in a switching mode power supply A controller for providing a constant output current control signal in a switched mode power supply (SMPS) includes a conduction time compensation circuit that is configured to produce a compensated conduction time interval signal that includes compensation for a ri... | 07/03/2012 |
| 8208276 | Power conversion device A three-level PWM converter includes first to third fuses having one terminals connected to a DC positive bus, a DC negative bus and a DC neutral point bus, respectively, first and second IGBT elements connected between respective ones of the other terminals of the ... | 06/26/2012 |
| 8189356 | PWM inverter There is provided a PWM inverter capable of preventing a phase error from occurring in generating a PWM signal even in the case where a carrier wave frequency is not sufficiently higher than a signal wave frequency. A PWM signal generating section (2) include... | 05/29/2012 |
| 8159849 | Downsized power inverter and housing for a larger heat release value A power inverter comprises at least a box-shaped housing; and a power module, a smoothing capacitor, a base plate made of a flat plate, and a rotating electric machine control circuit board arranged in order in the housing. The base plate is arranged with the fringe... | 04/17/2012 |
| 8154897 | RF power supply An RF power supply, in particular a plasma supply device, for generating an output power greater than 500 W at an output frequency of at least 3 MHz includes at least one inverter connectable to a DC power supply, which inverter comprises at least one switching elem... | 04/10/2012 |
| 8120936 | DC-to-AC power converting device A power converting device is adapted for converting a DC voltage input from an external power source into an AC voltage output. The power converting device includes: a transformer having first and second windings each having opposite first and second ends; a clamp u... | 02/21/2012 |
| 8107269 | Power converter An apparatus to convert a direct current to an alternating current includes a power module disposed between an input terminal of the direct current and output terminal of the alternating current, the power module comprising an on/off switch element, a first smoothin... | 01/31/2012 |
| 8054660 | Inverter module with thermally separated semiconductor devices Systems and apparatus are provided for an inverter module for use in a vehicle. The inverter module comprises a first electrical base and a second electrical base each having an electrically conductive mounting surface, wherein the electrical bases are physically di... | 11/08/2011 |
| 8027183 | 3-phase inverter module, motor driving apparatus using the same, and inverter integrated circuit package A 3-phase inverter module is provided, which includes first and second U-phase switching elements connected in series to each other to constitute a U-phase inverter, first and second V-phase switching elements connected in series to each other to constitute a V-phas... | 09/27/2011 |
| 8023296 | High voltage, high speed, high pulse repetition rate pulse generator A high voltage, high speed, and high repetition rate pulse generator solves the high pulse repetition rate limitations associated with RF power amplifiers. The pulse generator employs resonant techniques to provide current limiting features that allow for continued ... | 09/20/2011 |
| 8000119 | Switching mode power supply and method of operation In one embodiment, an SMPS includes a rectifier for generating an input DC voltage from an input AC voltage. A switching transistor is coupled to a primary coil of a transformer for generating power which is transferred to a second side of the transformer according ... | 08/16/2011 |
| 7965529 | Voltage source inverter and medium voltage pre-charge circuit therefor A medium voltage adjustable frequency drive includes an input isolation transformer having a three-phase input and a three-phase output, a converter having a three-phase input electrically connected to the three-phase output of the input isolation transformer and an... | 06/21/2011 |
| 7881085 | Inverter and programming device thereof It is possible to easily and rapidly develop an inverter application while maintaining stable quality. Executable code modules which have been sufficiently tested are installed in an inverter. An application source code is created on a programming device by using fu... | 02/01/2011 |
| 7755918 | Converter circuit for switching a large number of switching voltage levels A converter circuit for switching a large number of switching voltage levels is specified, in which a first switching group is provided for each. Second switching groups are provided, each having a first, second, third, fourth, fifth and sixth drivable bidirectional... | 07/13/2010 |
| 7751215 | Semiconductor device and electric apparatus having a semiconductor layer divided into a plurality of square subregions The present invention provides a semiconductor device and an electric apparatus each of which can realize both high-speed switching operation and energy loss reduction and excels in resistance to current concentration based on a counter electromotive voltage generat... | 07/06/2010 |
| 7751214 | Power control apparatus and method A power control apparatus and power control method that reduce harmonic noise produced when modulating a carrier wave frequency over predetermined cycles. A command value signal is generated for obtaining a desired output voltage, and a carrier wave is output. The f... | 07/06/2010 |
| 7692938 | Multiphase power converters and multiphase power converting methods A new class of multiphase converters having at least two switching cells driven by out-of-phase PWM reference signals and corresponding respective PWM control signal signals. In some embodiments, once of the switching cells are driven as a function current-balancing... | 04/06/2010 |
| 7599202 | DC-AC converter with feedback signal control circuit utilizing power supply voltage, controller IC therefor, and electronic apparatus utilizing the DC-AC converter An inverter controls the power supplied to a load such as a CCFL connected to a secondary winding of a transformer by means of pulse width modulation (PWM) control of the switches of a semiconductor switching circuit connected to the primary winding of the transform... | 10/06/2009 |
| 7542317 | Semiconductor device and power conversion apparatus using the same The power conversion apparatus uses the semiconductor device. Said semiconductor device includes a first group of power semiconductor elements at least one of which is electrically connected between a first potential and a third potential, a second group of power se... | 06/02/2009 |
| 7460380 | Highly efficient switching power converter using a charge pump to power the drive circuit A switching power converter having a first and a second transistor are connected in series with the transformer to provide higher switching efficiency. A charge pump circuit is coupled to a drive circuit to provide a power source for driving the first transistor. A ... | 12/02/2008 |
| 7436160 | Half bridge adaptive dead time circuit and method A high voltage offset detection circuit registers the voltage at the midpoint of a switching half-bridge and may determine when the midpoint voltage reaches a given value to avoid hard-switching in the half-bridge switches. The midpoint voltage of the switching half... | 10/14/2008 |
| 7414864 | Switching power supply apparatus A switching power supply apparatus includes a first inductor that is serially connected to a primary winding of a transformer, and a second inductor that is arranged so as to apply a voltage of a capacitor with sine waves obtained by rectifying an AC input voltage f... | 08/19/2008 |
| 7411801 | Method and apparatus for controlling voltage linearity of voltage source inverters Methods and apparatus are provided for modifying a pulse width modulation signal controlling a voltage source inverter. The method comprises the steps of determining a duty cycle of the signal, clipping the duty cycle when a modulation index is greater than a minimu... | 08/12/2008 |
| 7400122 | Method and apparatus for reducing audio noise in a switching regulator A switching regulator utilizing on/off control that reduces audio noise at light loads by adjusting the current limit of the switching regulator. In one embodiment, a switching regulator includes a state machine that adjusts the current limit of the switching regula... | 07/15/2008 |
| 7397679 | Inductive transmission of electric energy An inductive electric energy transmission circuit includes: an oscillating circuit; a push-pull circuit including a first switching transistor and a second switching transistor that are configured to alternate a current flow through the oscillating circuit. The circ... | 07/08/2008 |
| 7375984 | Zero voltage zero current switching converter A power converter circuit includes an input switching circuit, an isolation circuit, a rectifier circuit that includes a least a pair of rectifiers, and an output circuit. The input switching circuit receives a first voltage and generates an AC voltage. The isolatio... | 05/20/2008 |
| 7362019 | Vehicle alternator A vehicle alternator for generating electric power has a stator, a rotor, a rectifier, a regulator case, and a cooling fin part. A stator winding is wound on the stator. The rotor is placed on opposite faces to the stator. The rectifier rectifies an alternating curr... | 04/22/2008 |
| 7362600 | Method and apparatus for cycle error correction for a power converter device, such as an electronic power inverter Cycle error correction is performed in an electronic power system to compensate for a difference between an AC grid side frequency and an AC load side frequency. The electronic power system includes an electronic power inverter, such as one usable with an uninterrup... | 04/22/2008 |
| 7359219 | Power supply A power supply, including a step-up converter, a resonant converter, and control unit. The step-up converter is connected to the resonant converter; the step-up converter and the resonant converter are each connected to the primary control unit. ... | 04/15/2008 |
| 7359222 | Method and apparatus to improve regulation of a power supply Techniques are disclosed to regulate a power supply with a compensation signal generation circuit. One example regulated power supply includes a sense circuit coupled to sense an output voltage of the regulated power supply. The regulated power supply also includes ... | 04/15/2008 |
| 7355864 | Switching regulator and its control method A switching regulator has an input voltage detection circuit which inputs a voltage applied to a rectifier diode 7 connected in series with the secondary side of a transformer and generates a voltage signal Vvp corresponding to the voltage, and a calculation ... | 04/08/2008 |
| 7339801 | Switching power supply circuit The present invention provides a voltage resonant converter that achieves ZVS over the entire allowable load range. A switching power supply circuit includes a class-E resonant converter as its primary-side switching converter that is supplied with a DC input voltag... | 03/04/2008 |
