Air conditioner controller and safety control circuit thereof

Abstract

An air conditioner controller and a safety protection circuit for the same are provided. The air conditioner controller includes a central processing unit, a drive unit, a safety locking unit and a protection detection unit, where the central processing unit is configured to output an air conditioner control signal; the air conditioner motor drive unit is configured to receive a drive control signal output from the safety locking unit and the detection protection signal, and output a drive signal to control an operation of an air conditioner motor; the safety locking unit is configured to receive the detection protection signal and the air conditioner control signal, output the drive control signal, and control the air conditioner control signal to be transmitted or cut off based on the detection protection signal output from the protection detection unit.

Description

【Technical field】 [0001] The invention belongs to the field of air conditioners, in particular to an air conditioner controller with more than two safety protection circuits. 【Background technique】 [0002] In the air-conditioning system, the main points of air-conditioning safety are: Excessive discharge pressure of the compressor will cause the pipeline to burst, and fragments or high-pressure gas will be sprayed out to hurt people; Excessive operating current of the compressor or fan will cause the temperature of the compressor or fan to be too high. High and cause refrigerant overpressure or damage insulation, etc., these components involving safety points are usually controlled by the control circuit. In order to avoid safety accidents, it is necessary to set safety protection devices for these components, such as setting safety valves for compressors, or setting protection circuits for control circuits of compressors and fans. [0003] Although general electrical appl...

AI Technical Summary

Problems solved by technology

[0004] Existing air-conditioning safety circuits, such as preventing the exhaust temperature / pressure from being too high, although some are equipped with exhaust temperature sensors or high-power models are also equipped with high-voltage protection switches, but most of them simply use these sensors The physical quantity is transmitted to the MCU, and all protections are processed and protected by the software of the MCU

This type of safety protection circuit does not have a single fault-tolerant design and does not have a single fault-tolerant capability

At the same time, these sensors are directly connected to the MCU without a safety isolation circuit; and many air-conditioning controllers use a single MCU and a control circuit scheme that is not isolated from the power grid in order to save costs, so that the exhaust gas temperature sensor or the high-voltage protection switch is not isolated from the power grid. Risk of electric shock and potential safety hazard

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