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An IGBT overcurrent protection circuit and an air conditioner

An overcurrent protection circuit and circuit technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as IGBT burnout, achieve high reliability, realize overcurrent protection, and improve stability sexual effect

Pending Publication Date: 2018-12-14
AUX AIR CONDITIONING LTD BY SHARE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention aims to propose an IGBT overcurrent protection circuit to solve the problem that the IGBT is easily burned due to the overcurrent of the PFC circuit

Method used

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  • An IGBT overcurrent protection circuit and an air conditioner
  • An IGBT overcurrent protection circuit and an air conditioner
  • An IGBT overcurrent protection circuit and an air conditioner

Examples

Experimental program
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Effect test

Embodiment 1

[0033] like figure 1 Shown is a schematic diagram of the IGBT overcurrent protection circuit in this embodiment; wherein, the IGBT overcurrent protection circuit includes a current sampling unit 20 , a protection unit 30 , a driving unit 40 and a control unit 50 .

[0034] combine figure 2 As shown, the current sampling unit 20 is respectively connected to the emitter of the switching tube IGBT, the negative pole of the DC side of the rectifier bridge BG1 in the power factor correction circuit 10, and the input terminal of the protection unit 30. The output of the current sampling unit 20 to the power factor correction circuit 10 The current is sampled to obtain a sampled current, and the sampled current is sent to the input terminal of the protection unit 30 .

[0035] The protection unit 30 is used to convert the sampling current into a sampling voltage and compare it with the reference voltage to output a detection signal; the output terminal of the protection unit 30 is ...

Embodiment 2

[0041] As the above-mentioned IGBT overcurrent protection circuit, the difference of this embodiment is that, in combination with figure 2 As shown, the power factor correction circuit 10 in this embodiment includes an AC power source AC, a rectifier bridge BG1, an inductor L, a switching tube IGBT, a fourth diode D4, an electrolytic capacitor E1, and an electrolytic capacitor E2. The first AC input terminal of the rectifier bridge BG1 is connected to the neutral terminal ACN of the AC power supply AC, and the second AC input terminal of the rectifier bridge BG1 is connected to the phase terminal ACL of the AC power supply AC. The anode of the DC side of the rectifier bridge BG1 is connected to one end of the inductor L, and the other end of the inductor L is divided into two paths, one path is connected to the collector of the switching tube IGBT, and the other path is connected to the anode of the fourth diode D4. The cathode of the fourth diode D4 is the output terminal of...

Embodiment 3

[0043] As the above-mentioned IGBT overcurrent protection circuit, the difference of this embodiment is that, in combination with figure 2 As shown, the protection unit 30 includes a first comparison circuit 301, and the first comparison circuit 301 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first comparator IC1A, The first DC power supply VCC.

[0044] The first comparator IC1A includes a first input terminal and a second input terminal. The first input terminal of the first comparator IC1A is divided into two paths, one path is grounded through the fourth resistor R4, and the other path is connected to the first direct path through the second resistor R2. The current power supply VCC is connected. The second input end of the first comparator IC1A is divided into two paths, one path is respectively connected to the negative pole of the DC side of the rectifier bridge BG1 and the current sampling unit...

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PUM

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Abstract

The invention provides an IGBT overcurrent protection circuit and an air conditioner. The IGBT overcurrent protection circuit includes a current sampling unit, a protection unit, a drive unit and a control unit, wherein the current sampling unit is connected with an emitter of the switch tube, A DC side negative electrode of a rectify bridge in a power factor correction circuit, and the input endof the protection unit separately, The output end of the protection unit is divided into two paths, one is connected with the input end of the control unit, the other is connected with the input end of the drive unit through a wire, the output end of the control unit is connected with the input end of the drive unit, and the output end of the drive unit is connected with the grid of the switch tube. Thus, when overcurrent occurs to the power factor correction circuit, the IGBT overcurrent protection circuit generates hardware protection, thereby realizing more timely and effective protection of the switch tube.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an IGBT overcurrent protection circuit and an air conditioner. Background technique [0002] Inverter air conditioners generally add active power factor correction (Power Factor Correction, power factor correction) control technology in order to improve the power factor, and at the same time adjust harmonic currents to reduce the impact of air conditioners on the power grid. However, the active power factor correction control scheme is relatively complicated. Improper control can easily cause overcurrent and overheating and burn down the IGBT (Insulated Gate Bipolar Transistor). Usually, a protection device is added to the circuit to improve the performance of the circuit. reliability. The existing technology basically uses the combination of software and hardware. The hardware detects the conduction current of the IGBT. When it exceeds the threshold value set by the ov...

Claims

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Application Information

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IPC IPC(8): H02H3/087
CPCH02H3/087
Inventor 赵新荣薄传海孙海波熊刚
Owner AUX AIR CONDITIONING LTD BY SHARE LTD
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