Overheating protection control circuit of frequency-variable compressor, frequency-variable compressor system and refrigerator

Abstract

The invention discloses an overheating protection control circuit of a frequency-variable compressor, a frequency-variable compressor system and a refrigerator. The overheating protection control circuit of the frequency-variable compressor comprises a temperature protector, a protection signal detection circuit and a driving control module, wherein the temperature protector corresponds to the frequency-variable compressor; when the temperature of the frequency-variable compressor is greater than a first preset threshold value, the temperature protector is in an off state; the protection signal detection circuit is used for outputting a detection signal according to an on state or the off state of the temperature protector; and the driving control module is used for receiving the detection signal and controlling the frequency-variable compressor according to the detection signal. The overheating protection control circuit disclosed by the invention is simple in structure and high in reliability, can effectively realize overheating protection of the frequency-variable compressor and effectively avoid impact on devices such as a frequency-variable controller and the frequency-variable compressor due to forced outage, thus prolonging the service lives of the devices, and hardly causes electromagnetic interference.

Description

technical field [0001] The invention relates to the technical field of refrigeration equipment, in particular to an overheat protection control circuit of a variable frequency compressor, a variable frequency compressor system and a refrigerator. Background technique [0002] With the implementation of the new mandatory energy efficiency national standard "Limited Values ​​of Power Consumption and Energy Efficiency Levels of Household Refrigerators", the proportion of frequency conversion refrigerators and freezers will increase significantly due to the obvious advantages of frequency conversion technology in product energy saving. In terms of protection mechanism, there are two main methods for the current frequency conversion refrigerator freezer products, one is the software protection of the frequency conversion controller, that is, the software can realize overvoltage, undervoltage, overcurrent, phase loss, out of step, etc. When the power supply voltage is abnormal or ...

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Problems solved by technology

[0003] However, the first method does not have the over-temperature protection of the inverter compressor, and there are no effective protection measures when the inverter compressor is overheated and other abnormal conditions

In the second way, since the overload protector is connected in series in the AC side circuit terminal, if the overload protector operates, it will forcibly cut off the power to the inverter controller and the inverter compressor, which will affect the inverter controller and inverter to a certain extent. The frequency conversion compressor causes impact and affects the life of the product. At the same time, due to the limitation of the assembly process of the refrigerator freezer harness, the power line needs to be routed together with the three-phase line of the frequency conversion compressor. In this case, the power line is easily affected by the frequency conversion. The electromagnetic interference of the three-phase line of the compressor will affect the EMC (Electro Magnetic Compatibility, electromagnetic compatibility) test effect of the whole machine

[0004] At present, the products of frequency conversion refrigerators and freezers urgently need to be solved, which can not only realize the over-temperature protection of the frequency conversion compressor, but also avoid the impact of forced power failure on the frequency conversion controller and frequency conversion compressor, and do not bring the electromagnetic interference of the three-phase line of the frequency conversion compressor into trouble. problem with power cord

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