A switch control method and device for a three-phase full-bridge topology loop

Abstract

The invention discloses a switch?control method and a device for a three-phase full-bridge?topology loop. The switch?control method for the three-phase full-bridge?topology loop comprises steps of acquiring three phases of voltage Va,?Vb,?and Vc at the alternating current side, voltage Vdc at the direct current side and a switching cycle of a switch transistor, determining the sector where the three phases of voltage Va,?Vb,?and Vc are located according to the three phases of voltage Va,?Vb,?and Vc at the alternating current side, acquiring the conduction time of the switch transistor according to the three phases of voltage Va,?Vb,?and Vc at the alternating current side, the voltage Vdc at the direct current side and the switching cycle of the switch transistor, and controlling switching on and switching off of the switch transistor according to the sector where the three phases of voltage Va,?Vb,?and Vc are located and the conduction time of the switch transistor. When the switch?control method and the device for the three-phase full-bridge?topology loop are adopted, the control algorithm of the switch transistor can be simplified, the control process of the switch transistor is simplified, the switching loss is reduced, and a three-phase cross circuit can be easily realized.

Description

technical field [0001] The invention relates to the technical field of three-phase full-bridge topology control, in particular to a switch control method and device for a three-phase full-bridge topology loop. Background technique [0002] In the existing loop switch control method of the three-phase full-bridge topology, the pulse width regulation of the entire three-phase full-bridge topology loop is usually realized by separately controlling the opening and closing of each switching device. Such as figure 1 As shown, it is a three-phase full-bridge topology circuit diagram; if the circuit needs to perform pulse width control, the entire circuit needs to control the opening and closing of six switching tubes separately, which makes the control of the entire switching tube more complicated. Especially in the complex circuit of three-phase interleaved parallel connection, if pulse width modulation is required, it is necessary to separately control the opening and closing of...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, it is a three-phase full-bridge topology circuit diagram; if the circuit needs to perform pulse width control, the entire circuit needs to control the opening and closing of six switching tubes separately, so that it can be realized, which makes the control of the entire switching tube more complicated

Especially in the complex circuit of three-phase interleaved parallel connection, if pulse width modulation is required, it is necessary to separately control the opening and closing of the six switching tubes of each parallel branch, which makes the switching control of the entire three-phase interleaved parallel circuit complicated. , making it difficult to implement an interleaved parallel circuit

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