Capacitor-clamped three-level dual-buck half-bridge inverter

Abstract

The invention discloses a capacitor-clamped three-level dual-buck half-bridge inverter which comprises a first three-level duck circuit, a second three-level duck circuit, a direct-current power-supply input circuit and a load circuit, wherein each three-level duck circuit comprises two power switching tubes, two power diodes, a clamping capacitor and an inductor, and +1, -1 and 0 three-state levels are output by an inverter bridge under the actions of controlling the switching tubes and clamping the clamping capacitor, thereby realizing the three-level dual-buck half-bridge inverter. The invention has the advantages that the advantage that a DBI circuit has not problems of through bridge arms or backward recovery of switching tube body diodes is inherited; the advantage that a three-level convertor per se has small output voltage harmonic content is reserved; compared with a traditional half-bridge inverter, the voltage stress of power devices is reduced; and the whole circuit structure is simpler and easy to realize.

Description

1. Technical field [0001] The invention relates to an inverter, in particular to a capacitor-clamped three-level double-buck half-bridge inverter. 2. Background technology [0002] Dual Buck Inverter (hereinafter referred to as DBI) is a new type of inverter topology that has emerged in recent years. Compared with traditional inverter topologies such as push-pull and full bridge, DBI has outstanding advantages such as no bridge arm shoot-through hazard and no switch body diode reverse recovery problem, and is suitable for aerospace and other inverter reliability requirements. High occasions. DBI provides a simple way to realize the high reliability and high efficiency of the inverter at the same time, and it is a topological structure with important research value and broad development prospects. DBI has some similarities with traditional half-bridge inverters. DBI needs to introduce a half-bridge input mode. The amplitude of the external positive and negative DC bus volta...

AI Technical Summary

Problems solved by technology

Due to the limitation of device manufacturing technology, the withstand voltage of power semiconductor devices has a certain limit, resulting in the device withstand voltage and power conversion voltage. level conflict

In high-voltage converters, using power tubes in series is a solution, but due to the inconsistency of device parameters and asynchronous switching transients, it is difficult to achieve voltage equalization in steady-state and transient processes, resulting in over-voltage of individual power tubes. voltage, reducing circuit reliability

Images