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Alternating current input voltage sampling circuit, sampling method and bridgeless PFC circuit

A technology of AC input and voltage sampling, which is applied in high-efficiency power electronic conversion, electrical components, reactive power compensation, etc., can solve the problems of input common-mode electromagnetic interference, high cost, and complicated AC input voltage sampling, and achieve simple circuit structure, cost reduction effect

Inactive Publication Date: 2010-02-03
EMERSON NETWORK POWER ENERGY SYST NORTH AMERICA
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  • Description
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  • Application Information

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Problems solved by technology

[0005] However, the bridgeless PFC circuit also has two main disadvantages that limit its wide application:
[0006] 1. The input common mode electromagnetic interference is serious;
[0007] 2. AC input voltage sampling is complex
Compared with AC sampling with bridge PFC, the cost of this method is still high

Method used

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  • Alternating current input voltage sampling circuit, sampling method and bridgeless PFC circuit
  • Alternating current input voltage sampling circuit, sampling method and bridgeless PFC circuit
  • Alternating current input voltage sampling circuit, sampling method and bridgeless PFC circuit

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Embodiment Construction

[0041] The features and advantages of the present invention will be described in detail with reference to the accompanying drawings.

[0042] Firstly, the working characteristics of the bridgeless PFC circuit are analyzed. Please refer to figure 1 , in a bridgeless PFC circuit, the first inductor L1 and the second inductor L2 are connected to the input voltage VS of the AC input in , set L1=L2=L, the voltage of the AC input line AC_L (L line) to the control ground is V AC_L , the voltage of the AC input neutral line AC_N (N line) to the control ground is V AC_L , when the AC input is in the positive half cycle, there is: V AC_L >V AC_N ,

[0043] When the switch is on:

[0044] Assuming that the inductor current is i1 at this time, and it rises linearly, then

[0045] V AC_N =V gnd -L(di1 / dt)=-L(di1 / dt) (1)

[0046] When the switch is off:

[0047] Assuming that the inductor current is i2 at this time, and it decreases linearly, then

[0048] V A_CN =V gnd -L(di2...

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Abstract

The invention discloses an alternating current input voltage sampling circuit of a bridgeless PFC circuit, comprising a firing line sampling unit and a midline sampling unit; the input end of the firing line sampling unit is coupled with the alternating current input firing line phase of the PFC circuit; the input end of the midline sampling unit is coupled with the alternating current input midline phase of the PFC circuit; the firing line sampling unit is used for obtaining voltage signal controlled by the alternating current input firing line pair and transforming the voltage signal into alternating current input voltage positive semicircle signal, the midline sampling unit is used for obtaining voltage signal controlled by the alternating current input midline pair and transforming thevoltage signal into alternating current input negative semicircle signal. The invention also discloses a sampling method of the alternating current input sampling circuit and a bridgeless PFC circuitwith the alternating current input sampling circuit. By using the invention, the structure of the sampling circuit can be simplified, and the product cost can be effectively reduced.

Description

【Technical field】 [0001] The invention relates to a PFC circuit, in particular to an AC input voltage sampling circuit for a bridgeless PFC circuit, a sampling method and a bridgeless PFC circuit with the sampling circuit. 【Background technique】 [0002] In order to improve the power factor and reduce the harmonic content of the input current, a power factor correction (Power Factor Correction, hereinafter referred to as PFC) circuit is mostly used for adjustment in power electronic equipment. Such as figure 1 As shown, compared with the traditional PFC circuit with bridge rectifier circuit, the bridgeless PFC circuit has the following two main advantages: [0003] 1. The circuit structure is simple; [0004] 2. Since there is no input rectifier bridge, the conduction loss can be reduced, so the conversion efficiency is high. [0005] However, the bridgeless PFC circuit also has two main disadvantages that limit its wide application: [0006] 1. The input common mode ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02M1/42
CPCY02B70/126Y02E40/30Y02B70/10
Inventor 朱岩
Owner EMERSON NETWORK POWER ENERGY SYST NORTH AMERICA
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