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2608results about How to "Reduce switching losses" patented technology

Grid-connected photovoltaic inverter

The invention discloses a grid-connected photovoltaic inverter and relates to equipment which employs irreversible DC power input conversion as AC power output for a semiconductor device with a control electrode and is used for being used together with a power supply system of a power supply. The equipment consists of a photovoltaic array module, four identical switching tubes, two identical diodes, four identical capacitors, an inductor and a power grid; and the topology ensures not to generate DC component or common mode current for the power grid. Meanwhile, the inverter has low output current ripple and higher efficiency, and overcomes the defects that the conventional full-bridge inverters and other types of transformerless photovoltaic inverters generate DC component in the power grid and generate common mode current or / and higher current ripple. Compared with a half-bridge inverter, the grid-connected photovoltaic inverter reduces the differential mode voltage and current ripple by half.
Owner:HEBEI UNIV OF TECH

Method and apparatus for electronic power control

The method of the invention in one aspect involves electronic power control by varying the amplitude of an electrical power supply voltage, independent of frequency, whereby the output frequency will always be the same as the input frequency. An electrical circuit apparatus for accomplishing this function in a specific embodiment is also disclosed herein. The specific circuitry of this aspect of the invention uses eight solid state switches, such as IGBT's, eight diodes, an inductor, input and output filters and novel controlling circuitry. The controller apparatus and methods of the invention may be used to implement all otherwise conventional converter types, buck, boost, and inverting (and duals of these) versions to obtain different regulating characteristics, including galvanic isolation of the output from the input. Indeed, the eight-switch controller can act to either buck or boost the input voltage, and can switch between bucking and boosting during a cycle, thus providing more control of the regulated output voltage. The inventive methods and devices may be used in power factor correction, voltage and/or current harmonic filtering and neutralization, line and load conditioning, control of power transfer between two power grids, and programmable control of surges, sags, dropouts and most other voltage regulation problems.
Owner:MICROPLANET

Submodule topology for modular multi-level transverter and application of modular multi-level transverter

The invention discloses a submodule topology for a modular multi-level transverter. The submodule topology comprises a first switching module, a second switching module, a direct current capacitor and a third switching module, wherein the first switching module and the second switching module are connected in series, the negative end of the first switching module is connected with the positive end of the second switching module, and the first switching module and the second switching module are formed by connecting full-controlled devices and diodes in an antiparallel mode. The positive electrode and the negative electrode of the direct current capacitor are connected with the positive end of the first switching module and the negative end of the second switching module. The third switching module is electrically connected with the first switching module and the second switching module, so that a full-controlled device of the third switching module applies trigger pulses all the time during normal operation and is in a conducting state all the time, and currents of direct current faults can be blocked by locking the trigger pulses of the third switching module when direct current faults happen. The invention further comprises the transverter comprising a submodule and application of the transverter. By means of the submodule topology for the modular multi-level transverter and application of the modular multi-level transverter, a function of isolating the direct current faults is achieved, quantity and switching losses of switching devices in the submodule are decreased, and requirements on trigger simultaneity are reduced.
Owner:HUAZHONG UNIV OF SCI & TECH

Method and apparatus for electronic power control

The method of the invention in one aspect involves electronic power control by varying the amplitude of an electrical power supply voltage, independent of frequency, whereby the output frequency will always be the same as the input frequency. An electrical circuit apparatus for accomplishing this function in a preferred embodiment is also disclosed herein. The preferred circuitry of this aspect of the invention uses four solid state switches, such as IGBT's, four diodes, an inductor, input and output filters and novel controlling circuitry. The controller apparatus and methods of the invention may be used to implement all otherwise conventional converter types, buck, boost, and inverting (and duals of these) versions to obtain different regulating characteristics, including galvanic isolation of the output from the input. The inventive methods and devices may be used in power factor correction, voltage and / or current harmonic filtering and neutralization, line and load conditioning, control of power transfer between two power grids, and programmable control of surges, sags, dropouts and most other voltage regulation problems.
Owner:MICROPLANET

Controller of adjustable DC voltage for a transformerless reactive series compensator

A controller for controlling a reactive series compensator serially inserted at compensator terminals into a power transmission line for controlling the line current. The controller includes a current control loop and a voltage control loop. A current controller outputs a control voltage (cc.sub.out) indicating a desired compensator terminal output voltage (u.sub.c). A control method selector means generates, in a low output voltage region, a constant reference voltage (u.sub.DC.sup.ref) for the voltage control loop and a variable modulation index mq of a modulation signal m=m.sub.d cos (.omega.t) -m.sub.q sin (.omega.t). In a high output voltage range, the control method selector outputs a constant modulation index m.sub.q and a variable reference voltage (u.sub.DC.sup.ref). The voltage controller outputs the modulation index m.sub.d of the modulation signal m. Furthermore, the control method selector can include a rate limiter for limiting the change rate of the reference voltage (u.sub.DC.sup.ref). In connection with the control method selection and / or the rate limiter, a decoupling control for making the voltage and current control loops independent from each other can be used. The controllers find particular application in transformerless reactive series compensators for single-phase or three-phase control.
Owner:MITSUBISHI ELECTRIC CORP
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