Air conditioner controller and its safety control circuit

Abstract

The invention provides an air conditioner controller and a safety protection circuit thereof. The air conditioner controller includes a central processing unit that outputs an air conditioner control signal, a drive unit that receives the control signal output by the central processing unit to control the operation of an air conditioner motor, and a transmission unit that transmits the central processing unit. The control signal is sent to the safety lock unit of the drive unit, and one output signal of the protection detection unit is directly input to the drive unit of the air conditioner motor, and the drive unit stops driving the air conditioner motor; the other way of the protection signal is sent to the safety lock unit to cut off the central processing unit The drive control signal sent by the unit to the drive unit; and a protection signal is output to the central processing unit to stop sending the drive signal. The air conditioner controller of the present invention can provide various safety protections.

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

[0003] Although general electrical appliances are equipped with safety protection devices, this protection device is a single protection. Often accidents occur because of the failure of a certain component in the configured safety device, which leads to the failure of the entire safety device. The device has only a single protection, once the safety device fails, the entire protection cannot be realized

[0004] Existing air conditioner safety circuits, such as preventing exhaust temperature / pressure from being too high, although some are equipped with exhaust temperature sensors or higher-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

Images