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Power-factor control circuit and control method thereof

A power factor control and power factor technology, applied in the direction of output power conversion devices, electrical components, sustainable manufacturing/processing, etc., can solve problems such as harmonic distortion and achieve the effect of improving harmonics

Active Publication Date: 2015-06-10
ACBEL POLYTECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] Therefore the main purpose of the present invention is to provide a kind of power factor control circuit, to improve the harmonic distortion defect of known control circuit

Method used

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  • Power-factor control circuit and control method thereof
  • Power-factor control circuit and control method thereof
  • Power-factor control circuit and control method thereof

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Embodiment Construction

[0074] figure 1 It is a circuit diagram of the power factor control circuit of the present invention, wherein the power factor control circuit 20 is connected to an AC power supply (Vac) through a rectifier 10, and the AC power supply is converted into a DC sine wave power supply by the rectifier 10. The input terminal obtains a DC sine wave power supply. The power factor control circuit 20 can be a boost converter or a buck converter, both of which can operate in a continuous current mode or a discontinuous current mode; the present embodiment uses a boost converter The power structure is illustrated as an example. The power factor control circuit 20 includes an inductor L, a diode D, an output capacitor C, a resistor R, an active switch 21 and a power factor controller 30 .

[0075] The inductor L, the diode D, the output capacitor C and the resistor R are connected in series and form a loop with the rectifier 10; the active switch 21 is electrically connected between the ...

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PUM

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Abstract

The invention relates to a power-factor control circuit and a control method thereof. A power-factor controller is utilized for judging that whether the operation of the power-factor control circuit is in a continuous current mode or a discontinuous current mode, and a corresponding pulse width modulation signal is output to the power-factor control circuit according to a judgment result; the duty period of the pulse width modulation signal is the sum of a feedforward control parameter and a current compensation parameter, and the current compensation parameter comprises an error value of a reference current and an inductive current in the power-factor control circuit; and therefore, a replaceable power supply circuit can obtain the corresponding pulse width modulation signal depending on an internal current mode, and a harmonic defect is effectively improved.

Description

technical field [0001] The invention relates to a power factor control circuit and its control method, in particular to a control circuit and a control method for outputting corresponding pulse width modulation signals according to the current mode of the switching power supply circuit. Background technique [0002] Please refer to Figure 5 As shown, to convert the AC power (Vac) of the commercial power into DC power for use by the load 60 , a rectifier 50 and a switching power supply circuit 70 are connected between the AC power (Vac) and the load 60 . The rectifier 50 converts the AC power into a DC sine wave voltage; the input end of the switching power supply circuit 70 is connected to the output end of the rectifier 50, so that the DC sine wave voltage is converted into a stable DC power supply and output to the Load 60, wherein the switching power supply circuit 70 includes a power factor correction circuit 71 and a DC / DC converter 72, the DC / DC converter 72 converts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42
CPCY02B70/10Y02P80/10
Inventor 叶家安陈翔逸
Owner ACBEL POLYTECH INC