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Power factor correction circuit and control method thereof

A power factor correction and circuit technology, which is applied in the field of correction circuits, can solve problems such as high cost and complex circuits, and achieve the effects of high processing efficiency, simple circuits and low cost

Inactive Publication Date: 2011-09-21
刘非
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, no matter which mode the existing power factor correction circuit adopts, it needs to use the PFC control IC, and the IC also includes its peripheral circuits. Therefore, there are disadvantages such as complex circuits and high costs. Continuous progress and continuous upgrading of products, the existing power factor correction circuit needs further innovation

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

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Embodiment Construction

[0010] Such as figure 1 The circuit schematic shown: including the transformer T 1 , full bridge rectifier circuit B 1 , switch tube Q 1 , capacitance C 2 , input capacitance C 3 , output capacitance C 1 , Energy storage inductance L 2 , the first freewheeling diode D 2 and the second freewheeling diode D 5 , input capacitance C 3 Parallel in the full bridge rectifier circuit B 1 The output terminal of the full bridge rectifier circuit B 1 One end of the connection is grounded, and the other end is connected to the energy storage inductor L 2 One end of the energy storage inductor L 2 The other end of the second freewheeling diode D is connected in series 5 After connecting the switch tube Q 1 The drain of the switch tube Q 1 The gate of the FM circuit is connected, the source is grounded, and the transformer T 1 The primary connection switch Q 1 Drain of the first freewheeling diode D 2 Parallel transformer T 1 of the secondary, the capacitor C 2 in series ...

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Abstract

The invention discloses a power factor correction circuit and a control method thereof, which can effectively improve the power factor and the efficiency and also has the advantages of simple circuit and low cost. The power factor correction circuit is characterized by comprising a rectifier bridge, a switching tube, a free wheeling diode and an energy storage inductor; and a discontinuous current mode is adopted, and the inductive current is made to lift linearly by making use of an on or off state of the switching tube, so that an absolute value of the inductive current follows an absolute value of the input voltage at the highest point in each period so as to realize power factor correction. A working mode that an integrated circuit (IC) is controlled by power factor correction (PFC) is banned by the invention, a dedicated switching tube and an IC peripheral circuit are saved, and the invention has the characteristics of simple circuit, low cost and high processing efficiency, accords with the sustainable development concept, has high applicability and is particularly suitable for low-cost and high-quality factor power conversion equipment.

Description

technical field [0001] The present invention relates to a correction circuit, in particular to a power factor correction circuit and its control method that can effectively improve power factor and efficiency, and has a simple circuit and low cost, and is especially suitable for low-cost, high-quality factor electric energy conversion equipment . Background technique [0002] The current power factor correction circuit can be roughly divided into two categories: one is passive power factor correction circuit, which mainly expands the conduction angle of the input current through circuit design, including the use of a large inductor connected in series after rectification to It achieves the purpose of the input current following the input voltage waveform, thereby improving the quality factor, but in view of the limited improvement of its quality factor, and at the same time, there are shortcomings such as large size and heavy weight, so its application range is limited; the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42
CPCY02B70/126Y02B70/10
Inventor 刘非
Owner 刘非