Three-level circuit for charging handheld electric crank

Abstract

The invention provides a three-level circuit for charging a handheld electric crank. The three-level circuit comprises switching tubes S1, S2, S3, S4, S5 and S6, diodes D1 and D2, an alternating current power supply ug, inductors L1 and L2, capacitors C1 and C2 and a load RL, wherein the switch tubes S1, S2, S3, S4, S5 and S6, the diodes D1 and D2, the alternating current power supply ug, the inductors L1 and L2 and the capacitors C1 and C2 form a cascade type three-level rectifier loop with a diode series switch tube bridge arm; and the load RL is connected to the output end of the cascade type three-level rectifier loop. The preceding-stage bridge arm is of a diode and switch tube series connection structure, the bridge arm direct connection risk is avoided, meanwhile, the circuit is combined with the cascaded switch tube bridge and the three-level structure, and the advantages of being large in circuit power density, small in alternating current harmonic wave, low in switch tube voltage stress and the like are achieved.

Description

Technical field [0001] The present invention relates to the field of switchgear electropping cell systems and power electron multi-level converters, and in particular, to a three-level circuit for hand-held electric shake charging. Background technique [0002] The operation requirements of the switchgear in the power system are more frequent, and the emergence of electric shakes helps complete the opening, closing of the opening cabinet, and improve the working efficiency and safety of the operators. The battery system of the electric shaker includes a pre-stage rectifier circuit, a DC-DC buck converter, and an operation of the converter in the control system control system. The power supply of the AC input is then transmitted to the lower DC step-down circuit, and the voltage is filtered. Powering the electric shake. The multi-level circuit has significantly improved the voltage stress that can effectively reduce the voltage stress of the switch, and there is a significant incr...

AI Technical Summary

Problems solved by technology

However, as the number of output levels of the circuit increases, the number of DC splitting capacitors also increases, and the balance of its voltage becomes more difficult and complicated, while the three-level circuit maintains the advantages of the multi-level circuit, and at the same time, the balance of the capacitor voltage is relatively low. easy to accomplish

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