Single-phase and three-phase double voltage-boosting and reducing power factor correcting circuit and control method thereof

Abstract

The invention discloses a single-phase double voltage-boosting and reducing power factor correcting circuit which comprises a single-phase three-potential voltage-boosting and reducing power factor correcting circuit, a single-phase three-potential voltage-reducing power factor correcting circuit, a first output capacitor, a second output capacitor and a midline, wherein the single-phase three-potential voltage-boosting and reducing power factor correcting circuit is used for receiving an input voltage, is provided with a first output end, a middle point and a second output end and is used for outputting a first output voltage and a second output voltage; the single-phase three-potential voltage-reducing power factor correcting circuit is used for receiving the input voltage and is coupled to the first output end, the middle point and the second output end; the first output capacitor is coupled to the first output end and the middle point; the second output capacitor is coupled to themiddle point and the second output end; and the midline is coupled to the middle point. The single-phase/three-phase double voltage-boosting and reducing power factor correcting circuit and the control method thereof solve the problem of overlarge conduction loss in a voltage-reducing working mode of a voltage-boosting diode in a traditional single-phase three-potential voltage-boosting and reducing power factor correcting circuit.

Description

technical field [0001] The invention relates to a single-phase / three-phase dual buck-boost / buck PFC circuit (single-phase / three-phase dual buck-boost / buck PFC circuit) and its control method, in particular to a single-phase three-potential Single-phase three-level buck-boost PFC circuit (single-phase three-level buck-boost PFC circuit) and single-phase three-level buck PFC circuit (single-phase three-level buck PFC circuit) Step-down power factor correction circuit and its control method. Background technique [0002] Power electronics technology has developed rapidly in the past two decades and has been widely used in electric power, chemical industry, communication and other fields. Most power electronic devices are connected to the power grid through a rectifier. A typical rectifier is a nonlinear circuit composed of diodes or thyristors, which will cause serious harmonic pollution and reactive power to the grid during operation. Therefore, Become an electrical hazard. ...

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Problems solved by technology

[0012] The main purpose of this case is to provide a single-phase / three-phase dual-boost buck-boost power factor correction circuit and its control method, which can solve the problems of the boost diode in the traditional single-phase three-potential buck-boost power factor correction circuit. For the problem of excessive on-state loss, the three-phase dual buck-boost power factor correction circuit is composed of three independent single-phase double buck-boost power factor correction circuits. Since there is a neutral line, the first and second The second and the third single-phase double buck-boost power factor correction circuits do not affect each other and operate independently of each other; they can be used to improve the total harmonic distortion and improve the efficiency of the three-phase buck-boost power factor correction circuit, so the present invention The provided three-phase buck-boost power factor correction circuit has relatively high efficiency and improves the power density of the system; it also has the advantages of separate control of each phase current and easy realization of a parallel system.

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