Abstract: The intelligent power module IPM is the core component of the home appliance inverter control board. The common failure mode of the IPM is that the temperature of the internal power device is too high and damaged. The built-in temperature sensor has more or less become the standard configuration of the IPM. However, the temperature output methods of different types of IPM are not the same. In order to improve the reliability of IPM temperature protection function and avoid reducing the service life of frequency conversion control board. This article analyzes, summarizes and experimentally studies the temperature output functions of the IPM series that are mainstream in the market for white appliances, and proposes targeted software and hardware design methods and key points, and passed test and mass production data prove that this method can greatly reduce the over-temperature failure rate of IPM.

Key words: Invertor, IPM temperature output, V_OT, Over temperature protection