Hybrid conduction mode-based novel single-phase PFC and control method thereof

Abstract

The invention discloses a hybrid conduction mode-based novel single-phase PFC. The hybrid conduction mode-based novel single-phase PFC comprises a main circuit, a current sampling circuit, a voltage sampling circuit and a signal conditioning circuit, wherein the current sampling circuit, the voltage sampling circuit and the signal conditioning circuit are connected with the main circuit, the signal conditioning circuit is connected with the main circuit, the current sampling circuit and the voltage sampling circuit and employs single-period control of a hybrid conduction mode, and two controlmodes of a continuous conduction mode and a disconnection conduction mode are used. The invention also provides a control method of the hybrid conduction mode-based novel single-phase PFC. The hybridconduction mode is employed, the size of boost inductance is greatly reduced, and the power density is improved; a single-period control strategy is used for controlling, the hybrid conduction mode-based novel single-phase PFC has the advantages of a favorable control effect ,more rapid response speed, rapid and accurate load adjustment, high interference-resistant capability, simple control ruleand the like and is easy to implement, and network-side current sine, unit power factor and DC-side voltage constant are achieved.

Description

technical field [0001] The invention belongs to the field of single-phase electric energy conversion, and in particular relates to a novel single-phase PFC circuit and a control method based on a mixed conduction mode. Background technique [0002] Nowadays, single-phase power factor correction circuits are ubiquitous, that is, rectifier circuits; power factor correction circuits are used in industrial applications of various power levels, so the research and improvement of power factor correction circuits is very necessary. There are many power factor correction circuits that are most commonly used at present, such as uncontrolled diode full-bridge rectification, PWM rectification, hybrid rectification, etc., but there is a serious problem with uncontrolled rectification that the current harmonic content at the input terminal is very rich, and this The harm to the grid is very great. The PWM rectifier circuit improves the disadvantage of harmonics. It has low harmonic cont...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above problems, provide a new type of single-phase PFC circuit and control method based on mixed conduction mode, improve single-phase power factor correction circuit with low efficiency, low power density, low reliability, low power factor, input Disadvantages of high harmonic content of terminal current

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