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Power factor correction circuit

A power factor correction, power stage circuit technology, applied in the power supply field, can solve the problems of miniaturization and integration of disadvantageous circuits, increase the cost of system implementation, etc., and achieve the effect of reducing anti-electromagnetic interference and realizing power factor correction.

Inactive Publication Date: 2011-08-17
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to realize the variability of switching frequency, frequency synthesis technology is usually used, such as using a separate dedicated chip for generating variable frequency, but the method of using a separate dedicated chip for generating variable frequency will also greatly increase the cost of system implementation, and will not Conducive to miniaturization and integration of circuits

Method used

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Embodiment 1

[0066] In this embodiment, the concrete idea of ​​the present invention is described by taking the AC power supply as an example, below in conjunction with the figure image 3 , Figure 4 and Figure 5 Taking an AC / DC power supply circuit as an example of a step-up power stage circuit, the working process of the power factor correction circuit in this embodiment is described in detail, image 3 It is an AC / DC power supply circuit with a step-up power stage circuit, Figure 4 is the working waveform diagram of the power factor correction circuit in the AC / DC power supply, Figure 4 It is a schematic diagram of the circuit structure of the current modulation circuit 27.

[0067] see image 3 and Figure 4 , the working process of the whole AC / DC power supply circuit is as follows: the external sinusoidal AC input AC passes through the bridge rectifier circuit 21 to output the full upper half-cycle sinusoidal voltage V IN , flows to the inductor L 21 The inductor current I...

Embodiment 2

[0083] The power factor correction circuit and the overall circuit structure diagram of the AC / DC power supply disclosed in the embodiment of the present invention are similar to the previous embodiment, the difference is that the embodiment of the present invention discloses the structure of the inductor current sampling circuit 24 and the intermediate signal generating circuit 25 Figure, such as Image 6 and Figure 7 as shown, Image 6 It is a circuit structure diagram of the inductor current sampling circuit 24 disclosed in this embodiment, Figure 7 It is a circuit structure diagram of the intermediate signal generating circuit 25 disclosed in this embodiment, Figure 8 It is a working waveform diagram of the intermediate signal generating circuit 25.

[0084] like Image 6 As shown, the inductor current sampling circuit includes:

[0085] The first voltage-current conversion circuit 41 is used to convert the sampled voltage signal V cs Converted to a sinusoidal hal...

Embodiment 3

[0114] Different from the previous embodiment, the circuit structure diagram of the intermediate signal generating circuit in this embodiment is as follows Figure 9 As shown, the upper limit reference voltage in this embodiment is a variable upper limit voltage, therefore, the intermediate signal generating circuit 25 also includes:

[0115] A variable upper limit voltage generating circuit 56, the variable upper limit voltage generating circuit 56 includes a third reference current source I ref3 and the third resistor R 52 , the third reference current source I ref3 The first end of the access to the first reference voltage V DD , the second terminal and the third resistor R 52 connected to the first terminal, the third reference current source I ref3 with the third resistor R 52 The connection point of the access to the modulated current signal I mod , the third resistor R 52 The second end of the ground; the modulation current signal I mod with the third reference ...

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Abstract

The invention discloses a power factor correction circuit. The power factor correction circuit comprises an inductive current sampling circuit, an intermediate signal generation circuit, a current modulation circuit and a control drive circuit, wherein the inductive current sampling circuit is used for sampling an inductive current flowing through an inductor, and generating a half-sinusoid current signal and a half-sinusoid voltage signal according to the inductive current; the intermediate signal generation circuit receives the half-sinusoid voltage signal to generate a ramp signal and a clock signal; the current modulation circuit receives the half-sinusoid current signal and an output voltage feedback signal to generate an adjustment signal, and compares the adjustment signal with the ramp signal serving as a carrier to generate a modulation signal; the control drive circuit receives the modulation signal and the clock signal to generate a corresponding control signal to control a power switching tube to work at a variable working frequency, ensure the consistency between the waveform of the inductive current and the waveform of the half-sinusoid voltage, and maintain an output voltage to be constant basically. The power factor correction circuit can realize anti-electromagnetic interference and simultaneously reduce the realization cost of a circuit by integrating a frequency jitter technology and the power factor correction circuit.

Description

technical field [0001] The invention relates to the field of power supplies, more specifically, to a power factor correction circuit integrated with frequency shaking technology. Background technique [0002] The AC / DC power supply in the prior art generally includes: EMI (Electromagnetic Interference, electromagnetic interference) filter network, rectifier circuit, power factor correction circuit and power stage circuit, figure 1 It is a working principle block diagram of the AC / DC power supply in the prior art. The alternating current AC is filtered by the EMI filter network 11, and after the electromagnetic interference is eliminated, the voltage output by the EMI filter network 11 is rectified by the full-bridge rectifier circuit 12, and then the voltage output from the full-bridge rectifier circuit 12 is further rectified by the power factor correction circuit 13 power factor correction, and finally input the voltage after power factor correction to the load 14 to driv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M1/44
CPCY02B70/126H02M1/4225Y02B70/10Y02P80/10
Inventor 徐孝如
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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