Single-phase X-shaped staggering three-level AC voltage regulating circuit

Abstract

The invention relates to a single-phase X-shaped staggering three-level AC voltage regulating circuit including a main circuit part and a switch tube protection part. The main circuit part includes a power source Ui, an inductor Li, an inductor Lo, a capacitor C1, a capacitor C2, a capacitor C, an IGBT switch tube S1, an IGBT switch tube S2, an IGBT switch tube S3, an IGBT switch tube S4, an IGBT switch tube S5, an IGBT switch tube S6, a diode D1, a diode D2, a diode D3, a diode D4, a diode D01, a diode D02, a diode D03, a diode D04, a diode D05, a diode D06, a diode D07, a diode D08 and a resistor R. The switch tube protection part includes an inductor Lr, a capacitor Cr and a capacitor CS. The quantity of involved components and parts is small and the cost is low. The structure of the voltage regulating conversion circuit is simple. Reverse phase voltage adjustment of input and output can be realized. The circuit provided by the invention has advantages of single-stage conversion, small quantity of output voltage harmonics, low 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 a single-phase X-type mutual staggered three-level AC voltage regulation circuit including the reverse phase output of a switch tube protection circuit. Background technique [0002] AC voltage regulating circuit is a circuit that converts AC input voltage into AC power with adjustable voltage within a certain range through a conversion circuit. With the rapid development of power electronics technology, the performance requirements of electrical equipment in all walks of life are increasing, and the requirements for voltage performance are getting higher and higher. 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 to obtain the form of electric energy required by each. [0003] CN101039078A discloses a non...

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

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