Undervoltage protection circuit and power module

Abstract

The application discloses an undervoltage protection circuit and a power module. The undervoltage protection circuit includes: a voltage sampling and power supply module, which collects the power supply voltage and outputs a detection voltage and converts the power supply voltage into a power supply voltage for internal power supply. The power supply voltage is less than Power supply voltage; the comparison module is connected with the voltage sampling and power supply module, compares the detection voltage with a reference and outputs a comparison signal, the comparison signal is used to control whether to supply power to the load, and the power supply voltage supplies power to the comparison module. In the undervoltage protection circuit provided by this application, the voltage acquisition and power supply module generates a power supply voltage lower than the power supply voltage for the internal power supply of the undervoltage protection circuit, and then the circuit module powered by the power supply voltage in the undervoltage protection circuit uses a low-voltage tube. Normal work can be done. Furthermore, the number of high-voltage tubes used in the undervoltage protection circuit is reduced, the working current consumption is effectively reduced, and the circuit area is reduced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular, to an undervoltage protection circuit and a power module. Background technique [0002] IPM (Intelligent Power Module, intelligent power module) is a new type of high-power power electronic device, which has the advantages of high current density, low saturation voltage and high voltage resistance. It is widely used in various fields such as air conditioners, washing machines, fans, etc. Reach the purpose of driving the motor of the above-mentioned electrical appliances. [0003] The smart power module integrates many electronic devices such as integrated circuit units and semiconductor components. In order to make the above electronic devices work normally, it is necessary to ensure that the smart power module works under a safe working voltage and working current environment. In practical applications, an undervoltage protection circuit will be set to detect the power ...

AI Technical Summary

Problems solved by technology

However, the power supply voltage VCC provided to the intelligent power module is relatively high, so that the undervoltage protection circuit 500 needs a lot of high-voltage power transistors to receive the power supply voltage VCC to maintain the normal operation of the undervoltage protection circuit 500, resulting in the area occupied by the undervoltage protection circuit 500 larger

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