PFC overcurrent protection circuit, air conditioner controller and air conditioner

Abstract

The invention discloses a PFC overcurrent protection circuit, an air conditioner controller and an air conditioner. The overcurrent protection circuit comprises a current protection module, a currenttransformer, an inductance unit, a rectifier diode, an electrolytic capacitor module, an insulated gate bipolar transistor, a driving module and a main control module. The first end of the current protection module is connected with the first end of the current transformer, the second end of the current protection module is connected with the second end of the current transformer, the third end ofthe current protection module is connected with the first input end of the main control module, and the fourth end of the current protection module is connected with the first input end of the driving module. The current protection module is arranged at the front end of the overcurrent protection circuit; when the current is abnormal, an abnormal signal is output to the driving module through thefourth end of the current transformer, so that the driving module controls the insulated gate bipolar transistor (IGBT) to be turned off, and by implementing the PFC overcurrent protection circuit, the problem that the circuit is damaged due to the fact that the IGBT is not turned off in time in an existing PFC overcurrent protection circuit can be solved.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a PFC overcurrent protection circuit, an air conditioner controller and an air conditioner. Background technique [0002] In air conditioner controllers, especially outdoor controllers, the problem of inrush current is prominent, which puts forward higher requirements for the reliability of the control board. [0003] The existing PFC protection circuit such as figure 1 As shown, the AC voltage signal input by the control board is collected by the voltage protection module, and processed by comparison and amplification to the main control module (MCU). Generally, the voltage is super high 260V effective value, and the MCU turns off the IGBT through the IGBT drive module. In this process, the total time delay of IGBT turn-off includes the time delay of the voltage protection module detecting voltage, the time delay of amplification and comparison, the time delay of MCU operation, an...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a PFC overcurrent protection circuit, an air conditioner controller, and an air conditioner, which can solve the problem that the existing PFC overcurrent protection circuit suffers from short-term surge voltage, and the IGBT is not turned off in time, resulting in circuit damage.

Images