A load protection circuit and air conditioner

Abstract

The invention provides a load protection circuit and an air conditioner and relates to the technical field of a switching power source. The load protection circuit includes a voltage detection moduleand a switch module, and the voltage detection module is electrically connected to the switch module; the voltage detection module is configured to enter a self-locking state when received first inputvoltage is greater than or equal to a preset voltage protection threshold value to keep the switch module in an off state; as the voltage of a three-phase electric current is higher than the voltageof a single-phase electric current, the first input voltage received via the voltage detection module is greater than or equal to the preset voltage protection threshold value when the three-phase electric current is misconnected, thus the voltage detection module enters the self-locking state, no voltage signal is output, a controller can be prevented from being damaged when the three-phase electric current is misconnected, the switch module can be prevented from having working voltage, thus a disconnected state can be maintained so as to cut off the connection between the power source and aload motor, and that the load motor cannot be damaged can be ensured.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a load protection circuit and an air conditioner. Background technique [0002] Inverter air conditioner controllers are divided into indoor and outdoor boards, both of which have power supply lines. Some existing air conditioners use single-phase power supply for the internal unit and three-phase power supply for the external unit. [0003] Since the whole machine is powered by the internal machine, the power supply needs to be connected through the terminal board. However, in the prior art, when supplying power to the internal unit, the experience of the staff is mostly used to connect the power supply of the terminal board. Once the staff is inexperienced or accidentally causes the terminal board to be connected to the three-phase power incorrectly, it will be damaged due to overuse. Overvoltage will cause damage to the controller and load motor. Contents o...

AI Technical Summary

Problems solved by technology

However, in the prior art, when supplying power to the internal unit, the experience of the staff is mostly used to connect the power supply of the terminal board. Once the staff is inexperienced or accidentally causes the terminal board to be connected to the three-phase power incorrectly, it will be damaged due to overuse. damage to the controller, load motor, etc.

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