Isolated flyback cycle-type single-stage multi-input inverter with external parallel time-sharing selection switches

Abstract

The invention relates to an isolated flyback cycle-type single-stage multi-input inverter with external parallel time-sharing selection switches. A circuit structure of the isolated flyback cycle-typesingle-stage multi-input inverter is formed by connecting multiple common-ground input filters and a common output isolated energy storage and variable-voltage cycle conversion filter circuit througha multi-input and single-output high frequency inverter circuit with external parallel time-sharing selection four-quadrant power switches; each input end of the multi-input and single-output high frequency inverter circuit is connected with an output end of each input filter in a manner of one-to-one correspondence; and the output end of the multi-input and single-output high frequency invertercircuit is connected with the input end of the output isolated energy storage and variable-voltage cycle conversion filter circuit. The inverter has the characteristics that multiple input sources aregrounded in common, time-sharing power supply is achieved, output is electrically isolated from input, the energy storage and cycle conversion filter circuit is shared, the circuit is simple, single-stage conversion is achieved, the isolated flyback cycle-type single-stage multi-input inverter is high in in efficiency, high in reliability in load short circuit and wide in application prospect, and a key technology is laid for achieving a small-capacity distributed power supply system of using multiple new energy sources for combined power supply.

Description

technical field [0001] The external parallel connection time-sharing selector switch isolation flyback cycle type single-stage multi-input inverter involved in the present invention belongs to the power electronic conversion technology. Background technique [0002] The inverter is a static converter device that uses power semiconductor devices to convert an unstable and inferior DC power into a stable and high-quality AC power for AC loads or AC grid connection. Inverters with low-frequency electrical isolation (including no electrical isolation) or high-frequency electrical isolation between the output AC load or the AC grid and the input DC power supply are called low-frequency link and high-frequency link inverters, respectively. The electrical isolation components mainly play the following roles in the inverter: (1) realize the electrical isolation between the output and input of the inverter, and improve the safety, reliability and electromagnetic compatibility of the ...

AI Technical Summary

Problems solved by technology

The distributed power generation system realizes multiple input sources simultaneously supplying power to loads and prioritizing the utilization of energy, which improves the stability and flexibility of the system, but there are defects such as two-stage power conversion, low power density, low conversion efficiency, and high cost. Its practicality is limited to a large extent

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