Back-to-back type three-level rectifier with heterogeneous hybrid bridge arms

Abstract

The invention discloses a back-to-back type three-level rectifier of a heterogeneous hybrid bridge arm. The back-to-back type three-level rectifier comprises switching tubes S1, S2, S3 and S4, diodes D1 and D2, an inductor L and capacitors C1 and C2; one end of the AC power supply is connected with one end of the inductor L, and the other end of the inductor L is connected with the drain electrode of the switch tube S1, the anode of the diode D1 and the cathode of the diode D2; the other end of the AC power supply is connected with the drain electrode of the switch tube S2, the source electrode of the switch tube S3 and the cathode of the diode D4. The source electrode of the switch tube S1 is connected with the source electrode of the switch tube S2; the cathode of the diode D1 is respectively connected with the cathode of a diode D3 and one end of a capacitor C1; the anode of the diode D2 is connected with the anode of the diode D4 and the other end of the capacitor C2. The drain electrode of the switch tube S4 is connected with the anode of the diode D3 and the drain electrode of the switch tube S3. The other end of the capacitor C1 is connected with the source electrode of the switching tube S4 and one end of a capacitor C2. Compared with a traditional two-level rectifier, the rectifier has the advantages that the number of levels of input side voltage can be three, and the capacitance value can be remarkably reduced; the voltage stress of the device is reduced; and the cost of the capacitor and the semiconductor device is reduced.

Description

Technical field [0001] The present invention relates to a three-level rectifier, and more particularly to a back-back-backed trial rectifier of a heterogeneous mixed bridge arm. Background technique [0002] For traditional two-level power factor correction (PFC) rectifier, it is difficult to achieve high efficiency when a wide input voltage range, such as a public grid as a power source. And when the alternating voltage level is low, the working efficiency of the traditional two-level rectifier will be greatly reduced. The back-backed three-level rectifier in the prior art is multi-level structure, and the total-controlled device used is much higher; the additional auxiliary circuit is much large, the volume is large, and the power density is low. In order to save costs, improve the backrest-type three-level rectifier power density, and reduce the difficulty of control, and propose a back-to-back three-level rectifier of a heterogeneous mixed bridge arm of the present invention....

AI Technical Summary

Problems solved by technology

[0002] For traditional two-level power factor correction (PFC) rectifiers, it is difficult to achieve high efficiency in a wide input voltage range, such as public grid as the power source

And when the AC voltage level is low, the working efficiency of the traditional two-level rectifier will be greatly reduced

Back-to-back three-level rectifiers in the prior art mostly adopt a cascaded structure, and there are many fully-controlled devices used, resulting in high cost; in addition, there are many auxiliary circuits, large volume, and low power density

Images