Air-conditioning capacitor discharge system

Abstract

The invention discloses an air-conditioning capacitor discharge system which comprises a switching circuit, a rectifying circuit, a filter circuit, an inverter circuit, a motor and an operation control circuit. The switching circuit controls switching on or off of an input power supply; the rectifying circuit rectifies the input alternating current power supply; the filter circuit contains capacitance and filters the rectified power supply; the inverter circuit is driven by output of the filter circuit; the motor is driven by output of the inverter circuit; one output end of the operation control circuit is connected to the switching circuit so as to control switching on or off of the switching circuit upon the input power supply, and the other output end is connected to the inverter circuit, so that when the switching circuit is disconnected with the input power supply, the inverter circuit is controlled to output direct current to the motor. By the air-conditioning capacitor discharge system which is simple to operate and safe and reliable, electric charge stored by capacitance on the filter circuit can be rapidly released, and maintaining and replacing time is saved.

Description

technical field [0001] The invention belongs to the field of air conditioners, in particular to an air conditioner capacitor discharge system. Background technique [0002] The power and operating current of the outdoor unit of the air conditioner, especially the central air conditioner, are gradually increasing with the market demand. In order to provide stable voltage and current, the air conditioner control board needs to use a large number of high-voltage electrolytic capacitors in the power circuit. [0003] The high-voltage electrolytic capacitors used in air conditioners are generally aluminum electrolytic capacitors, which are composed of the following parts: cathode aluminum foil, electrolytic paper, electrolyte, anode aluminum foil, and an aluminum oxide layer formed on the surface of the anode aluminum foil. [0004] Electrolytic capacitors can store and release charges, and can store the charges of the front-stage power supply for later-stage circuits, transform ...

AI Technical Summary

Problems solved by technology

[0006] If the capacitor discharge does not reach the safe voltage, the human body will cause electric shock when it touches the live parts, causing pain and skin damage in mild cases, and life-threatening in severe cases

[0007] When repairing and replacing the control board of the inverter air conditioner, maintenance personnel often replace the circuit board immediately after power failure. Since the electrolytic capacitor still has power and can release high-voltage DC power, it poses a great hidden danger to personal safety.

[0008] In order to discharge the electricity in the capacitor, most of the current treatment methods are to use an external discharge device to manually discharge or add a proprietary discharge circuit to the original circuit (generally use a resistor to discharge). It is difficult to complete; there is no cost advantage in adding a proprietary discharge circuit to the circuit, and generally uses resistor discharge, and the discharge speed is slow

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