Over-voltage protective method, indoor main control board, air conditioner and storage medium

Abstract

The invention discloses an over-voltage protective method. The method comprises the following steps: receiving a fault symbol sent by an outdoor main control board, wherein the fault symbol is generated while direct-current bus voltage of the outdoor main control board is higher than preset safety voltage; determining times of receiving the fault symbol, and judging whether the times of receivingthe fault symbol meet a turn-off condition of a relay or not; and if the times of receiving the fault symbol meet the turn-off condition of the relay, controlling the relay to continuously turn off, thereby realizing over-voltage protection on an electrolytic capacitor on the outdoor main control board. The invention further discloses an indoor main control board, an air conditioner and a computerreadable storage medium. Input high voltage of the outdoor main control board is turned off, so that a crack condition, due to input high voltage, of the electrolytic capacitor on the outdoor main control board is avoided, and therefore, the service life of the electrolytic capacitor is prolonged.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an overvoltage protection method, an indoor main control board, an air conditioner and a storage medium. Background technique [0002] With the continuous enhancement of people's awareness of energy saving, frequency conversion air conditioners are more and more popular among people. Electrolytic capacitors are generally used in the power supply circuit of outdoor units of frequency conversion air conditioners, because electrolytic capacitors can filter in the rectification link of the power supply circuit of outdoor units. And the role of absorbing feedback electric energy. However, according to statistics, electrolytic capacitor failure is the top three failures of components on the outdoor main control board of air conditioners, and the main cause of electrolytic capacitor failure is that the input voltage of the outdoor main control board is too high. [0003] At pr...

AI Technical Summary

Problems solved by technology

However, according to statistics, electrolytic capacitor failure is the top three failures of components on the outdoor main control board of air conditioners, and the main cause of electrolytic capacitor failure is that the input voltage of the outdoor main control board is too high

[0003] At present, the existing electrolytic capacitor overvoltage protection is often added an overvoltage protection device or circuit in the original outdoor unit power supply circuit, but in this way, other lines and components need to be added to the original outdoor unit power supply circuit. Therefore, The existing electrolytic capacitor overvoltage protection method increases the hardware cost of the air conditioner, and at the same time, it is easier to cause other failures of the air conditioner due to the failure of the overvoltage protection circuit itself

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