Single-phase AC-DC conversion circuit of directional power

Abstract

The invention provides a single-phase AC-DC conversion circuit of directional power. The single-phase AC-DC conversion circuit of the directional power comprises a power circuit, an auxiliary circuit and a control module. The power circuit is used for completing power conversion of a single-phase AC-DC. The auxiliary circuit is used for completing instantaneous detection of the input voltage, the input current and the output voltage, completing driving of an original PWM pulse, and outputting various detection values to the control module. After the control module receives the various detection values of the auxiliary circuit, the control module conducts digit arithmetic and logic processing on the basis of the principles of direct power control and double-loop control, finally, an original driving pulse is obtained, the original driving pulse is output to the power circuit after driving, on-off rules of a power device is controlled so as to enable the power circuit to complete correction of power factors, and the stable direct-current voltage is output. The single-phase AC-DC conversion circuit of the directional power achieves the single-phase AC-DC conversion of the network side unit power factors, and the single-phase AC-DC conversion circuit of the directional power has the advantages of being high in response speed, strong in anti-jamming capability and suitable for changes of loads within the wider range, and has load following features.

Description

technical field [0001] The present invention relates to a single-phase power factor corrector (PFC) in the technical field of power electronic conversion, in particular to a directional power single-phase AC-DC conversion circuit. Background technique [0002] In order to improve the grid-side power factor of the single-phase AC-DC converter using the rectifier bridge, reduce the harm of harmonic current, reduce the interference of harmonic current, and make it meet the relevant standards of harmonic current, it is necessary to adopt single-phase active power factor correction (PFC) technology. Single-phase active power factor correction technology has a variety of control strategies, such as traditional double-closed-loop control, to obtain a good correction effect. The single-phase active PFC with double closed-loop control has good power factor correction effect, but slow dynamic response and poor robustness. In principle, double closed-loop control requires a slow volt...

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Problems solved by technology

[0006] [2] He Zhiyuan and Wei Wei. "Research on Directional Power Control of PWM Rectifier Based on Virtual Flux Linkage". Journal of Zhejiang University. V38, No.12, 2004.11: 1619-1622. Its main technical characteristics are as follows: three-phase rectifier, response speed Fast, but due to the use of bang control, it brings sudden changes in switching frequency and introduces disturbance and noise, which reduces the reliability of the system and even deteriorates the performance of the system

[0007] Based on the above, the retrieval of the prior art of single-phase active power factor correctors found that directional power control has the advantage of fast response. The drastic change of switching frequency of traditional directional power control brings potential instability of the system, and the voltage outer loop limits the Response speed of traditional double closed-loop control

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