Isolation matrix converter and control method

Abstract

The invention discloses an isolation matrix converter and a control method. The converter comprises a bidirectional switch module, a transformer, a resonant inductor, a resonant capacitor and a bridge arm capacitor. The bidirectional switch modules and the bridge arm capacitors are connected in series to form bridge arms of the converter, and each bridge arm of the converter comprises at least one bidirectional switch module; a primary winding of the transformer is connected in series with the resonant inductor and the resonant capacitor and then connected with two ends of a bridge arm of the converter; the bidirectional switch module comprises a clamping capacitor and a bidirectional switch unit. The bidirectional switch unit forms two bridge arms of the module, and the two ends of the clamping capacitor are connected with the two ends of the two bridge arms of the module; the clamping capacitor and the two upper bridge arms or the two lower bridge arms of the two bridge arms form a clamping absorption circuit; the bidirectional switch unit comprises at least two controllable switch tubes; the clamping capacitor suppresses a voltage peak generated when a switching tube in the bidirectional switch module acts. Therefore, the switch tube is protected, the safety of the whole converter is protected, and the reliability of the whole converter is improved.

Description

technical field [0001] The present application relates to the technical field of power electronics, and in particular, to an isolated matrix converter and a control method. Background technique [0002] The isolation matrix converter generally includes a bidirectional switch and a transformer, and the input end of the transformer also includes a resonant circuit, which can generally realize the conversion from AC to AC, and can also realize the conversion from AC to DC. For example, the input is AC and the output is DC. [0003] see figure 1 , which is a schematic diagram of an isolated matrix converter provided in the prior art. [0004] like figure 1 As shown, the input end of the isolated matrix converter is connected to three-phase alternating current, and each phase of the isolated matrix converter includes a bidirectional switch, that is, the anti-parallel diodes of the two switches connected in series are in opposite directions, allowing the current to flow in both...

AI Technical Summary

Problems solved by technology

but, figure 1 The voltage clamp of the bidirectional switch in the isolated matrix converter shown is the AC line voltage, and the switch tube will switch a large current in the over-resonance region, so the voltage peak may be too high to cause the switch tube to fail due to overvoltage

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