Staggered three-level alternating current voltage regulation source

Abstract

The invention relates to a staggered three-level alternating current voltage regulation source, which comprises a voltage regulation source function circuit part and a protection circuit, wherein thevoltage regulation source function circuit part comprises a power supply Ui, an inductor Li, an inductor Lo, a capacitor C1, a capacitor C2, a capacitor C, an IGBT switching tube S1, an IGBT switchingtube S2, an IGBT switching tube S3, an IGBT switching tube S4, an IGBT switching tube S5, an IGBT switching tube S6, diodes D1 to D4, diodes D01 to D08 and a resistor R; and the protection circuit comprises an inductor Lr, a capacitor Cr and a capacitor CS. A small number of components are involved, the cost is low, the voltage regulation conversion circuit is simple in structure, input and output anti-phase voltage regulation can be realized, and the staggered three-level alternating current voltage regulation source has the advantages of single-stage conversion, few output voltage harmonics, small voltage stress and large output voltage regulation range.

Description

technical field [0001] The invention relates to the technical field of power electronic voltage regulation, in particular to an interleaved three-level AC voltage regulation source including an anti-phase output of a switch tube protection circuit. Background technique [0002] The AC voltage regulating circuit is a circuit that converts the AC input voltage into an AC power with adjustable voltage within a certain range through a conversion circuit. With the rapid development of power electronics technology, all walks of life have higher requirements for the performance of electrical equipment, and higher and higher requirements for voltage performance. The electrical equipment in many industries does not directly use the AC power provided by the grid as a power source, but transforms the AC power of the grid through various voltage regulating circuits, so as to obtain the required electrical energy form. [0003] CN101039078A discloses a non-isolated direct voltage regula...

AI Technical Summary

Problems solved by technology

CN102185481B and CN102882389A describe a circuit structure from AC to DC conversion, which can only be applied to LED lighting circuits

Most of the voltage regulation circuits studied have defects such as complex circuit structure, low output voltage waveform quality, and slow voltage regulation process.

[0004] When implementing the present invention, the inventor found that the double-tube bidirectional switch in this circuit can realize soft turn-off without adding a snubber circuit, but the single-tube bidirectional switch has a large number of high peak voltages , and the existing RCD and other switching tube snubber circuits still have a lot of peak voltage during the breaking process of the single-tube bidirectional switching tube, which cannot realize soft breaking well, which will undoubtedly increase the switching loss and reduce the voltage regulation of the circuit efficiency

Images