Three-Phase Single-Stage AC-DC Converter And Control Method And Control Apparatus Therefor

A three-phase single-stage AC-DC converter, characterized by comprising:

• a three-phase matrix switching circuit, a resonant circuit, an isolation circuit, and a rectifier circuit, wherein
• the three-phase matrix switching circuit is connected to a three-phase AC power and comprises three independent switch branches, each of the switch branches comprises an upper bridge arm and a lower bridge arm, an intermediate point between the upper bridge arm and the lower bridge arm in each of the switch branches is connected to a phase of AC input, and each bridge arm comprises one bidirectional switch component or two switch components which are connected in series in reverse;
• the resonant circuit comprises a resonant capacitor, a resonant inductor and an excitation inductor which are connected in series between a common endpoint of upper bridge arms of the three switch branches and a common endpoint of lower bridge arms of the three switch branches;
• a side of the isolation circuit is connected to the resonant circuit and another side of the isolation circuit is connected to the rectifier circuit;
• and
• the rectifier circuit comprises at least two switch components, an input side of the rectifier circuit is connected to the isolation circuit, and an output side of the rectifier circuit is connected to a load device.