Startup control method of high frequency chain inverter

Abstract

The invention discloses a startup control method of a high frequency chain inverter. The high frequency chain inverter comprises a transformer, a previous circuit and a next circuit. The transformer has a primary coil and two secondary coils. The previous circuit comprises an H bridge consisting of four switch transistors. The next circuit comprises a load output circuit consisting of switch transistors S7-S10. The next circuit further comprises next absorption capacitors (C3, C4, C5 and C6) of the transformer and switch transistors S5 and S6 controlling the next absorption capacitors of the transformer. According to the startup control method: a startup process falls into four control stages, that is, first, preparation stage, second, narrow pulse control stage, third, transition stage, and fourth, running stage. The startup control method of the high frequency chain inverter prevents overshoot overhigh voltage of the absorption capacitors so as not to cause protection trigger by the switch transistor (IGBT or MOS) or damage of the switch transistor, so that the high frequency chain inverter can start up smoothly.

Description

technical field [0001] The invention relates to a start-up control method of a high-frequency chain inverter. Background technique [0002] The inverter is a power conversion device that uses power semiconductor devices to convert DC power into AC power for AC loads. An inverter with high-frequency electrical isolation between the output AC load and the input DC power supply is called a high-frequency link inverter. High-frequency electrical isolation realizes the electrical isolation between the inverter output and input, which improves the safety, reliability and electromagnetic compatibility of the inverter operation; at the same time, it can match the inverter output voltage with the input voltage, that is, allows the input When the voltage changes in a wide range, the quality of the output voltage is guaranteed, and its application range is greatly broadened; and the operating frequency of the high-frequency transformer is above 20kHz, its volume, weight and audio nois...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a start-up control method of the high-frequency link inverter. The start-up control method of the high-frequency link inverter of the present invention can effectively avoid the triggering of the switch tube (IGBT or MOS) caused by the overshoot of the absorbing capacitor voltage Protection or damage problems, which is conducive to ensuring the smooth start-up of the high-frequency link inverter

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