Power factor correction circuit and air conditioner

A power factor correction and circuit technology, applied in emergency protection circuit devices, output power conversion devices, instruments, etc., can solve problems such as poor practicability

Pending Publication Date: 2019-07-05
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] like figure 1 As shown, the existing protection scheme can only realize the detection when the upper and lower Q1 and Q3 are abnormal, or the upper and lower Q2 and Q4 are abnormal, but in practical applications, the upper and lower switch tubes can be interlocked because the switch drive module itself For the protection circuit, it is difficult for the upper and lower bridge arms to pass through, so the probability of failure corresponding to this protection scheme is very low, and the practicability is relatively poor.

Method used

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  • Power factor correction circuit and air conditioner
  • Power factor correction circuit and air conditioner
  • Power factor correction circuit and air conditioner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] like figure 2 As shown, the power factor correction circuit according to an embodiment of the present invention is suitable for an air conditioner, and includes: a power factor correction module 10 for receiving a power supply signal, the power factor correction module 10 includes a switching tube, and the switching tube is configured In order to control the power supply signal to supply power to the load; the switch drive module is connected to the drive input terminal of the power factor correction module 10, and is used to output the switch signal to the power factor correction module 10; the control module 30 is connected to the power factor correction module 10. The switch drive module is used to control the switch drive module to turn on and output the switch signal or to turn off the output of the switch signal; the Hall current sensor 40 is arranged on the AC input side of the power factor correction module 10 to collect the input current , and the input curren...

Embodiment 2

[0059] like figure 2 As shown, on the basis of setting the Hall current sensor 40, in the above embodiment, optionally, it also includes: a sampling resistor Rs, which is set at the negative output terminal of the power factor correction module 10 and connected to the A driving protection module 50 , the driving protection module 50 outputs the protection signal to the control module 30 after detecting that the voltage drop on the sampling resistor Rs exceeds a second safety threshold.

[0060] In this embodiment, a Hall current sensor 40 is connected in series on the AC side of the power factor correction module 10 to be responsible for detecting the current on the AC side, and then the sampling signal output by the sensor is used as the input signal for driving the protection module 50, Combined with the sampling resistor Rs connected in series at the negative output terminal of the power factor correction module 10, the voltage detected by the sampling resistor Rs is also ...

Embodiment 3

[0066] like figure 2 As shown, in any one of the above embodiments, optionally, the power factor correction module 10 is formed by a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4, The first switching tube Q1 and the second switching tube Q2 are arranged on the upper part of the power factor correction module 10, the third switching tube Q3 and the fourth switching tube Q4 are arranged on the lower part of the power factor correction module 10, the first switching tube Q1 and the third The switch tube Q3 is arranged on the left part of the power factor correction module 10, the second switch tube Q2 and the fourth switch tube Q4 are arranged on the right part of the power factor correction module 10, the first switch tube Q1, the second switch tube Q2, the third switching tube Q3 and the fourth switching tube Q4 are connected in antiparallel with a freewheeling diode, the drain of the first switching tube Q1 is co...

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PUM

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Abstract

The invention provides a power factor correction circuit and an air conditioner. The power factor correction circuit comprises a power factor correction module, a switch driving module, a control module and a Hall current sensor and a driving protection module; the alternating current input terminal of the power factor correction module is connected with an alternating current power supply, and the power factor correction module is used for rectifying the alternating current power supply into direct current output; the switch driving module is connected with the driving input terminal of the power factor correction module and used for outputting a switching signal to the power factor correction module; the control module is connected with the switch driving module and used for controllingopening or closing of driving output on the switch driving module; the Hall current sensor is arranged at an alternating current input side of the power factor correction module; and the driving protection module is connected with the Hall current sensor and the control module and used for determining whether a protection signal is output to the control module according to a relationship between asampled signal and a corresponding first safety threshold. By virtue of the technical scheme of the invention, whether a rectifier is abnormal can be detected more directly, and a corresponding abnormal part can be determined under different working conditions when occurrence of abnormity is determined.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a power factor correction circuit and an air conditioner. Background technique [0002] In the related art, the power factor correction circuit (i.e. PFC circuit) adopts high-power MOS (metal-oxide-semiconductor) switching technology as the main power device to replace the IGBT (insulated gate bipolar transistor) device, and utilizes the low on-resistance of the MOS The characteristic replaces the characteristic of constant IGBT turn-on voltage drop to reduce the power consumption under low and medium power, so as to reduce the power consumption of the air conditioner. [0003] Four switching tubes are used to form a power factor correction module, and two half-bridge driver chips are used to drive. One of the driver chips has a protection function, combined with a sampling resistor for over-current detection. If a large current is detected, it will be triggered to turn ...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02H3/08H02H7/125H02H7/12G01R15/20G01R19/165G01R19/175G01R31/02
CPCH02M1/4208H02H3/08H02H7/125H02H7/12G01R19/16571G01R19/16576G01R19/175G01R15/202G01R31/50Y02B70/10
Inventor鲍殿生
OwnerGD MIDEA AIR-CONDITIONING EQUIP CO LTD