DCM Boost PFC convertor with long service life and PF as 1

A converter and long-life technology, applied in the direction of irreversible AC power input conversion to DC power output, output power conversion device, high-efficiency power electronic conversion, etc., can solve low input power factor, input current distortion, capacitor ripple Voltage increase and other issues, to achieve high power factor, high power density, small capacitor volume effect

Active Publication Date: 2013-11-27
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, after the value of the energy storage capacitor is reduced, the ripple voltage of the capacitor will inevitably increase. For the DCM Boost PFC converter, compared with that without reducing the value of the energy storage capacitor, the input current is more distorted and the input power factor PF is lower.

Method used

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  • DCM Boost PFC convertor with long service life and PF as 1
  • DCM Boost PFC convertor with long service life and PF as 1
  • DCM Boost PFC convertor with long service life and PF as 1

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Embodiment Construction

[0011] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] 1 Working principle of DCM Boost PFC converter

[0013] figure 1 It is the main circuit of the Boost PFC converter. For the convenience of analysis, the following assumptions are made first: 1. All devices are ideal components; 3. The switching frequency is much higher than the input voltage frequency.

[0014] figure 2 The inductor current waveform in one switching cycle during DCM is given. When the switch tube Q b When conducting, the diode D b Cut-off, the boost inductor is the Boost inductor L b The two ends are the rectified voltage v of the input alternating current g , its inductor current i Lb start with zero and start with v g / L b The slope increases linearly. When the switch tube Q b When turned off, the inductor current i Lb through diode D b Freewheeling, at this time Boost inductance L b The vol...

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Abstract

The invention discloses a DCM Boost PFC convertor with a long service life and a PF as 1. The convertor comprises a dominant power circuit and a control circuit. An energy storage capacitor in the dominant power circuit is a capacitor with small capacity and a long service life. The control circuit comprises an input voltage sampling circuit, an energy storage capacitor voltage sampling circuit, a subtraction circuit, a multiplying unit, an energy storage capacitor voltage feedback control circuit, a square root extractor, a PWM chip and a switching tube drive circuit. Input voltage and energy storage capacitor voltage feedforward control are led in, so in the convertor, capacitors of other varieties, such as a film capacitor or a ceramic capacitor or other capacitors with small capacity and a long service life can be utilized to replace an electrolytic capacitor, the value of the PE within the whole 85V-265V AC input voltage range is increased to 1, the obvious defects that traditionally, the electrolytic capacitor is adopted to serve as an energy storage capacitor and is large in size and short in service life are overcome, and the convertor has the advantages of being high in PF and power density, long in service life and the like.

Description

technical field [0001] The invention relates to the field of AC-DC converters of electric energy conversion devices, in particular to a long-life DCM Boost PFC converter with a PF of 1. Background technique [0002] With the development of power electronics technology, the requirements for power conversion devices are getting higher and higher, especially for input power factor (PF) and input current harmonics. Boost converter is one of the most commonly used several power factor correction (PFC) circuits. Generally, it can be divided into three types: inductor current continuous mode (CCM), inductor current critical continuous mode (CRM), and inductor current discontinuous mode (DCM). Because the DCM Boost PFC converter has the advantages of zero-current turn-on of the switching tube, no reverse recovery of the diode, constant switching frequency, simple control, and low cost, it has been widely used in low-to-medium power applications. But when the duty cycle is constant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M7/12
CPCY02B70/126Y02B70/10
Inventor 姚凯阮新波胡文斌吕建国李强
Owner NANJING UNIV OF SCI & TECH
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