Double output double step-down type half bridge inverter, and control and modulation method

Abstract

The invention relates to a double-output double-buck half-bridge inverter, composed of two parallel input sides and parallel or series output sides. For eliminating the loss caused by loop current energy, it works in a semicycle operating mode, and adopts a synchronous switching semicycle SPWM method, an alternative switching semicycle SPWM method or hysteresis current source type modulation method. By selecting a different frequency voltage reference, it can realize a different frequency double-output double-buck half-bridge inverter. For the power grade, it can compose a multi-parallel double-series double-output double-buck half-bridge inverter. It has no short-circuit problem of bridge leg of a half-bridge or full-bridge double-output inverter, but has high reliability; it sustains the current by power diodes in series on the same bridge leg, beneficial to increasing switching frequency; and because of working in a semicycle operating mode, there is no loop current energy in the circuit, beneficial to increasing efficiency.

Description

technical field [0001] The invention relates to a double-output double-step-down half-bridge inverter and a control and modulation method belonging to a power electronic converter. Background technique [0002] There are two traditional methods for dual output inverters: [0003] 1. Half bridge dual output inverter [0004] This kind of dual-output inverter is composed of two half-bridge inverters whose input side is connected in parallel and the output side is connected in series. , The performance of the body diode is poor, and the reverse recovery causes a large loss, which limits the increase of the switching frequency, so that the volume and weight are difficult to reduce; only series output, no parallel output, system resources are not fully utilized. [0005] 2. Full bridge dual output inverter [0006] This dual-output inverter is composed of two full-bridge inverters sharing one of the bridge arms, and the input side is connected in parallel and the output side i...

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Problems solved by technology

[0004] This kind of dual-output inverter is composed of two half-bridge inverters whose input side is connected in parallel and the output side is connected in series. , the performance of the body diode is poor, and the reverse recovery causes a large loss, which limits the increase of the switching frequency, so that the volume and weight are difficult to reduce; only series output, no parallel output, system resources are not fully utilized

[0006] This dual-output inverter is composed of two full-bridge inverters sharing one of the bridge arms, and the input side is connected in parallel and the output side is connected in series. Its main defect is basically the same as that of the half-bridge dual-output inverter, and the power switch The number of tubes is large and the cost is high

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