Switching power supply with function of correcting power factor as well as control device and control method thereof

A technology of power factor correction and switching power supply, which is applied in the direction of output power conversion device, control/regulation system, DC power input conversion to DC power output, etc., to achieve the effect of reducing total harmonic distortion and improving power factor

Active Publication Date: 2012-03-07
HANGZHOU SILAN MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0033] The present invention aims to solve the deficiencies in the current total harmonic distortion optimization method of

Method used

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  • Switching power supply with function of correcting power factor as well as control device and control method thereof
  • Switching power supply with function of correcting power factor as well as control device and control method thereof
  • Switching power supply with function of correcting power factor as well as control device and control method thereof

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Embodiment Construction

[0064] The essence of the invention and specific technical solutions of the present invention will be further described below in conjunction with the accompanying drawings.

[0065] image 3 It is a switching power supply with power factor correction proposed by the present invention, and the switching power supply is based on a TM mode topology of a multiplier.

[0066] image 3 The switching power supply 300 in includes a boost converter and a switching power supply control device 301:

[0067] The boost converter includes a diode full-wave rectifier bridge 303, referred to as a rectifier bridge for short. The input signal of the rectifier bridge is an AC input voltage. One end of a high-frequency filter capacitor Cin is connected to the rectifier bridge, and the other end of the filter capacitor Cin is grounded. An inductor L1 is connected to the common end of the filter capacitor Cin and the rectifier bridge, the other end of the inductor L1 is connected to the drain e...

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Abstract

The invention discloses a switching power supply with a function of correcting a power factor and a control device thereof. The control device of the switching power supply comprises a power factor corrector and a total harmonic distortion optimizer. An output end of the power factor corrector is connected with a power tube and the power factor corrector is used for determining turnon time and turnoff time of the power tube. An AC (alternate current) input voltage is input through an input end of the total harmonic distortion optimizer. An output end of the total harmonic distortion optimizer is connected with the power factor corrector. An AC input signal can be dynamically tracked by the total harmonic distortion optimizer. When the AC input voltage is increased, a peak current of an inductance of the switching power supply is reduced and a current that an AC power system charges a filter capacitor of the switching power supply is compensated; and when the AC input voltage is reduced, the peak current of the inductance of the switching power supply is increased and a current that the AC power system discharges the filter capacitor of the switching power supply is compensated. By utilizing the control device disclosed by the invention, the total harmonic distortion of the AC input current caused by the filter capacitor can be reduced and the power factor of the switching power supply is improved.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a switching power supply control technology with power factor correction (Power Factor Correction, PFC). Background technique [0002] Converting from 220V AC (Alternating Current, AC) to DC (Direct Current, DC) is a basic conversion device that is widely used in power electronics technology and electronic instruments, such as computers, televisions, monitors, fluorescent lamps, etc. Commonly used electrical equipment will use AC-DC switching power supply for power supply. [0003] At present, the commonly used AC-DC switching power supply is generally composed of a power factor correction (PFC) device and a DC-DC converter, wherein the power factor corrector is used as a pre-regulator to control the AC input current, forcing the AC input current waveform to track the AC Inputting a sinusoidal voltage waveform can make the AC input current waveform close to a sine wave. ...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02M1/12H02M3/335
CPCY02B70/10
Inventor 汤仙明姚云龙吴建兴
Owner HANGZHOU SILAN MICROELECTRONICS
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