Variable frequency air conditioner compressor counter electromotive force protection circuit

Abstract

The invention discloses a variable frequency air conditioner compressor counter electromotive force protection circuit. According to the variable frequency air conditioner compressor counter electromotive force protection circuit, an IPM module is connected in parallel with a protection circuit; when a compressor stops or is powered off instantly, the real-time power supply voltage of the IPM module is the sum of power supply voltage in a normal state and a counter electromotive force; when the real-time power supply voltage is larger than the value of voltage at two ends of an electrolytic capacitor, a diode on the protection circuit is turned on, so that the electrolytic capacitor is charged; and when the real-time power supply voltage is smaller than the value of the voltage at the two ends of the electrolytic capacitor, the diode on the protection circuit is not turned on, and the electrolytic capacitor performs discharging on a power consumption element on the protection circuit. The electrolytic capacitor can be charged, so that the counter electromotive force of the compressor can be absorbed, and therefore, the value of voltage at two ends of the IPM module can be limited to a low-voltage-value range; overvoltage protection is realized based on the cooperation of the small-sized electrolytic capacitor and the diode, and the size and capacitance value of the electrolytic capacitor are both small, and therefore, the structure of the protection circuit can be simplified, and production cost and use cost can be decreased.

Description

technical field [0001] The invention belongs to the technical field of frequency conversion air conditioners, and in particular relates to a counter electromotive force protection circuit for frequency conversion air conditioner compressors. Background technique [0002] The frequency conversion air conditioner is based on the ordinary air conditioner, which uses a special frequency conversion compressor and adds a frequency conversion control system. Its basic structure and refrigeration principle are exactly the same as ordinary air conditioners. Inverter air conditioners are widely used in the industry due to their advantages of energy saving, low noise, high temperature control accuracy, fast temperature adjustment speed and constant room temperature. [0003] With the increasing popularity of frequency conversion air conditioners, the requirements for the design structure size and price of frequency conversion air conditioner controllers are getting higher and higher. ...

AI Technical Summary

Problems solved by technology

However, this protection circuit uses a large electrolytic capacitor for back electromotive force protection. The capacitor has a large volume, a relatively complex structure, and a high capacitance value, which leads to high production and use costs.

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