Soft switching AC-DC Vienna converter topological structure and control method

Abstract

The invention relates to a soft switching AC-DC Vienna converter topological structure and a control method, and the structure comprises a first rectifier diode D1, a second rectifier diode D2, a first main switch S1, a second main switch S2, a first output DC link capacitor C01, and a second output DC link capacitor C01, and also comprises an active buffer circuit. The active snubber circuit comprises a snubber inductor LS, a first auxiliary active switch SS1, a first snubber capacitor CS1, a second auxiliary active switch SS2 and a second snubber capacitor CS2, and the snubber inductor LS isconnected with the negative electrode of a first rectifier diode D1 through the first auxiliary active switch SS1 and the first snubber capacitor CS1 in sequence, and is connected with the negative electrode of the second rectifier diode D2 through the second auxiliary active switch SS2 and the second buffer capacitor CS2 in sequence, and is grounded through a first main switch S1 and a second main switch S2 in sequence. Compared with the prior art, the invention has the advantages of reducing the reverse recovery loss of the rectifier diode, avoiding the ringing problem and the like.

Description

technical field [0001] The invention relates to circuit topology technology, in particular to a soft-switching AC-DC Vienna converter topology and control method. Background technique [0002] In the existing literature, there are many circuit topologies employing active and passive snubber circuits to generate soft switching conditions for semiconductor devices and rectifier diodes. These snubber circuits are used to limit the rate of change of the diode current and create soft switching conditions for the circuit's semiconductor components. [0003] Existing converter circuits using active snubber circuits feature reduced current and voltage stress in addition to soft switching for switch-on and rectifier-off, however, the auxiliary switches of active snubber circuits have higher current stress and work under hard switching conditions. In the boost topology described in the prior art, both the main switch and the auxiliary switch work under soft switching conditions. Howe...

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Problems solved by technology

[0003] Existing converter circuits using active snubber circuits feature reduced current and voltage stress in addition to soft switching for switch-on and rectifier-off, however, the auxiliary switches of active snubber circuits have higher current stress and work under hard switching conditions. In the boost topology described in the prior art, both the main switch and the auxiliary switch work under soft switching conditions. However, the voltage stress of the main switch is higher than that of the active snubber circuit. In the converter circuit (controlled by proper selection of the snubber inductor value and switching frequency), the gate drive circuit requirements are complex and expensive

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