Control device used for improving PF value of DCM Buck PFC converter

A control device and converter technology, applied in output power conversion devices, high-efficiency power electronic conversion, climate sustainability, etc., can solve problems such as poor EMI differential mode performance, large switch conduction loss, and large inductor current peak value. , to achieve the effect of small output voltage ripple, small conduction loss, and reduced inductor current ripple

Active Publication Date: 2016-01-06
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Although BoostPFC is an effective way to improve power factor and reduce current harmonics, the large loss at low-voltage input is also a bottleneck restricting its development, while BuckPFC makes the input and output voltages closer due to the Buck circuit’s own step-down characteristics. It can maintain high efficiency in the entire input voltage range. In addition, BuckPFC has the advantages of low output voltage, low common-mode EMI noise, no need for surge limiter and small main inductance, etc., which make

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  • Control device used for improving PF value of DCM Buck PFC converter
  • Control device used for improving PF value of DCM Buck PFC converter
  • Control device used for improving PF value of DCM Buck PFC converter

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[0024] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0025] 1DCMBuckPFC converter working principle

[0026] figure 1 It is the main circuit of BuckPFC converter.

[0027] For the convenience of analysis, first make the following assumptions: 1. All devices are ideal components; 2. The output voltage ripple is very small compared to its direct current; 3. The switching frequency is much higher than the input voltage frequency.

[0028] figure 2 The waveforms of switch tube current and inductor current in a switching cycle in DCM are given. When Q b When conducting, D b Cut off, inductance L b The voltage across it is v g -V o , Its current i Lb Start from zero with (v g -V o ) / L b The slope rises linearly, v g To load and energy storage capacitor C o powered by. When Q b When off, i Lb Pass D b Freewheeling, at this time L b The voltage across it is -V o , I Lb Take V o / L b The slope of is decreased,...

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Abstract

The invention discloses a control device used for improving the PF value of a DCM Buck PFC converter. The control device comprises a main power circuit and a control circuit. The main power circuit comprises an input voltage source vin, an EMI filter, a diode rectifier circuit RB, a Buck inductor Lb, a switch tube Qb, a diode Db, an output capacitor Co and a load RLd. The control circuit comprises an output voltage feedback control circuit, an input voltage feedforward circuit, a second multiplier and a sawtooth wave comparing and switch tube drive circuit. Input voltage feedforward and output voltage feedback are introduced, so that the duty cycle of the converter changes according to a certain rule in a power frequency cycle, and the PF value is improved to close to 1 in the AC input voltage range between 90V and 264V. The control device provided by the invention has the advantages of small output voltage ripple, small switch tube conduction loss, reduced required diode stress and the like.

Description

technical field [0001] The invention belongs to the technical field of AC-DC converters of electric energy conversion devices, in particular to a control device for improving the PF value of a DCMBuckPFC converter. Background technique [0002] A power factor correction (PowerFactorCorrection, PFC) converter can reduce input current harmonics and improve input power factor, and has been widely used. PFC converters are divided into active and passive methods. Compared with passive methods, the active method has the advantages of high input power factor, small size, and low cost. [0003] Since the development of active power factor correction technology (APFC) in the 1980s, scholars from various countries have conducted in-depth research from the perspectives of control strategy, circuit topology, and small signal modeling, and achieved a series of research results. For now, a new research focus of APFC technology is the research on PFC circuit topology. Theoretically, any ...

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Application Information

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IPC IPC(8): H02M1/42
CPCY02B70/10
Inventor 周旭峰姚凯李辉王祎王小平
Owner NANJING UNIV OF SCI & TECH
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