Isolation flyback cycle type single-stage multiple-input inverter with built-in parallel time-sharing selection switch

Abstract

The invention relates to an isolation flyback cycle type single-stage multiple-input inverter with a built-in parallel time-sharing selection switch. A circuit structure is formed by connecting a plurality of common-ground input filters and a common output isolation energy-storage power transformation cycle conversion filtering circuit by a multiple-input and single-output high-frequency invertingcircuit with a built-in parallel time-sharing selection four-quadrant power switch; each input end of the multiple-input and single-output high-frequency inverting circuit is correspondingly connected with the output end of each input filter; the output end of the multiple-input and single-output high-frequency inverting circuit is connected with the input end of the output isolation energy-storage transformation cycle conversion filtering circuit. The isolation flyback cycle type single-stage multiple-input inverter has the advantages that the multiple-input source common-ground and time-sharing power supply effect is realized, the output and input are electrically isolated, and the energy storage cycle conversion filtering circuit is shared; the circuit is concise, and is switched at single stage, the efficiency is high, the reliability is high during load short-circuiting, the application prospect is broad, and the like; a key technique is laid for the small-capacity distributed type power supply system using multiple types of new energy sources to jointly supply power.

Description

technical field [0001] The built-in parallel 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 inverter op...

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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