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Power factor correction circuit

A power factor correction and circuit technology, which can be used in output power conversion devices, electrical components, high-efficiency power electronic conversion, etc., and can solve problems such as low reliability.

Inactive Publication Date: 2016-05-04
GUANGDONG CHIGO AIR CONDITIONING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a power factor correction circuit to solve the problem of low reliability in the prior art

Method used

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Embodiment Construction

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0037] The invention provides a power factor correction circuit to solve the problem of low reliability in the prior art.

[0038] Specifically, the power factor correction circuit is applied to an air conditioner, such as figure 1 As shown, it includes: rectifier bridge 101, PFC main circuit 102, filter circuit 103, AC voltage sampling circuit 104, inductor current sampling circuit 105, output voltage sampling circuit 106, controller 107 and IGBT drive circui...

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Abstract

The invention provides a power factor correction circuit. An alternating current input voltage is received and rectified by a rectifying bridge; the alternating current input current is rectified by a PFC (power factor correction) main circuit into sine wave that has the same phase as the alternating current input voltage; the ripple voltage output by the PFC is filtered by a filter circuit to output stable output voltage; the alternating current input voltage output by an alternating current voltage sampling circuit, the inductance current output by an inductance current sampling circuit, and the output voltage output by an output voltage sampling circuit are received by a controller, and a (pulse width modulation) PWM control signal is generated and output according to the alternating current input voltage, the inductance current and the output voltage; and finally, a PWM signal is generated by an IGBT driving circuit and output to the IGBT control end in the PFC main circuit to realize the power factor correction for the alternating current input voltage; and in addition, the number of used devices is reduced and the probability of faults is lowered, so that the reliability of the power factor correction circuit is improved compared with the prior art.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a power factor correction circuit. Background technique [0002] Most of the power factor correction technologies applied to air conditioners in the prior art are passive PFC (PowerFactorCorrection, power factor correction) schemes, which generally use inductance compensation methods to reduce the phase difference between the fundamental current and voltage of the AC input to increase power. Factor, but the power factor of passive PFC is not very high, can only reach 0.7 ~ 0.8. [0003] In addition, there is also an active PFC analog control technology in the power factor correction technology applied to air conditioners in the prior art, which is composed of inductors, capacitors and electronic components. Compared with the passive PFC solution, its power factor is higher. [0004] However, the active PFC analog control technology applied to air conditioners in the pri...

Claims

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Application Information

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IPC IPC(8): H02M1/42
CPCH02M1/4208Y02B70/10
Inventor 林华刚刘群群徐林
Owner GUANGDONG CHIGO AIR CONDITIONING
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