Overcurrent protection circuit, method and air conditioner of adjustable ipm module

Abstract

The invention discloses an overcurrent protection circuit of an adjustable IPM (intelligent power module), a method and an air conditioner. The IPM comprises a current division output end and an overcurrent protection pin. The overcurrent protection circuit comprises a sampling circuit, an adjusting circuit and a comparison execution circuit, wherein the sampling circuit comprises a sampling resistor R1; the sampling resistor R1 is connected between the current division output end and ground, and forms a first node with the current division output end; the overcurrent protection value of the IPM is adjusted according to the type of a compressor, the environment temperature, and the temperature of the IPM, and a reference voltage signal is adjusted according to the overcurrent protection value; the comparison execution circuit comprises a comparator IC1 and an execution circuit, and is used for generating a corresponding control signal according to a real-time voltage signal from the sampling circuit and the reference voltage signal from the adjusting circuit, and outputting the control signal to the IPM. The overcurrent protection circuit has the advantage that the heating ability under the low temperature environment, or the refrigerating ability under the high temperature environment of the compressor is fully realized.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an overcurrent protection circuit of an adjustable IPM module, an air conditioner and an overcurrent protection method for an adjustable IPM module. Background technique [0002] At present, IPM (Intelligent Power Module, Intelligent Power Module) overcurrent protection adopts fixed resistor divider to design reference voltage, and no matter what the conditions are, the protection current point has been set. [0003] In practical applications, ferrite compressors are prone to demagnetization in low temperature environments, and attention needs to be paid to the setting of the overcurrent protection value under low temperature conditions, which cannot be greater than its demagnetization current value; while rare earth compressors are easy to demagnetization in high temperature environments, and special attention should be paid Overcurrent protection value setting in high ...

AI Technical Summary

Problems solved by technology

Taking the ferrite compressor as an example, in order to ensure the demagnetization current at low temperature, it is necessary to sacrifice the characteristics at high temperature, so it will run at a very low frequency at high temperature, which directly sacrifices the high temperature cooling capacity of the air conditioner

[0004] In addition, in order to ensure the reliability of the IPM module, the temperature of the IPM module has been used as a condition to control the operating frequency of the air conditioner, but the existing control is more directly involved in frequency limitation in high-temperature environments

In actual use, the frequency limit of the IPM module temperature is too high rarely occurs, so the derating of the IPM module is too large, and the system has not been used to the limit

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