Control system and method for improving pf of isolated three-level pfc converter

A converter and three-level technology, applied in control/regulation systems, high-efficiency power electronic conversion, and regulation of electrical variables, etc., can solve the problems of complex digital control methods and difficult implementation, and achieve good real-time performance, improved efficiency, and control The effect of simple method

Active Publication Date: 2019-06-25
南京航轩轨道交通科技有限公司
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Problems solved by technology

The limitations of analog control are increasingly unable to meet the requirements of today's energy standards in terms of efficiency and electromagnetic interference (EMI), while the existing digital control often has complex methods and is difficult to implement

Method used

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  • Control system and method for improving pf of isolated three-level pfc converter
  • Control system and method for improving pf of isolated three-level pfc converter
  • Control system and method for improving pf of isolated three-level pfc converter

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] 1. The working principle of the PFC stage of the isolated three-level PFC converter when it works in the inductor current discontinuous mode

[0032] The main circuit of the isolated three-level PFC converter of the present invention is as figure 1 As shown, the PFC stage with input current shaping function and the DC / DC stage with output voltage regulation function share the switch tube Q 2 and Q 3 , so it is a typical single-stage PFC converter. When the switching frequency of the switching tube is constant and the PFC stage of the converter under the control of the constant on-duty ratio works in the inductor current discontinuous mode (Discontinue Current Mode, DCM), the peak value of the inductor current is basically proportional to the input voltage, that is, the input current Automatically track the input voltage wave...

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Abstract

The invention discloses a control system and method for improving isolated three-level PFC converter PP. The system comprises an isolated three-level PFC converter and a digital processing controller, wherein the isolated three-level PFC converter comprises an AC input power source, a diode rectifier bridge, an input inductor and a half-bridge three-level DC converter, the AC input power source is connected with an input end of the diode rectifier bridge, an output end of the diode rectifier bridge is accessed to an input end of the half-bridge three-level DC converter through the input inductor, the digital processing controller comprises an ADC module, a data processing module and a PWM pulse width modulation module, and an output end of the PWM pulse width scheduling module is accessed to grid electrodes of switch tubes of the isolated three-level PFC converter through a driving circuit. The system is advantaged in that input current waveform of the converter can be effectively controlled for being pure sinusoid, and PF is improved to 1.

Description

technical field [0001] The invention belongs to the technical field of control in power electronic conversion technology, in particular to a control system and method for improving the PF of an isolated three-level PFC converter. Background technique [0002] With the development of power electronics technology, the requirements for input current harmonics and input power factor (Power Factor, PF) in power conversion devices are getting higher and higher, and power factor correction (Power Factor Correction, PFC) converters have been extensively studied. with application. PFC converters are mainly divided into two types: active and passive, among which active PFC has the advantages of small size, light weight, high input power factor and high efficiency. According to the circuit structure, active PFC can be divided into two-stage PFC circuit and single-stage PFC circuit. The two-stage PFC circuit is usually composed of a pre-stage power factor pre-regulator and a post-stag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/42H02M1/12
CPCH02M1/12H02M1/4233H02M1/4258H02M3/33515H02M3/33523H02M3/3353Y02B70/10Y02P80/10
Inventor 吕建国李冬莹胡文斌陈岳贤刘瑶秋
Owner 南京航轩轨道交通科技有限公司
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