Heat management circuit based on high-power converter and method thereof

The invention relates to a heat management circuit based on a high-power converter and a method of the heat management circuit. The heat management circuit comprises multiple temperature comparison circuits of multiple power bridge arms inside the internally-arranged converter, a temperature signal coding circuit, a temperature signal decoding circuit and a heat dissipation fan speed control circuit, wherein the temperature signal coding circuit, the temperature signal decoding circuit and the heat dissipation fan speed control circuit are connected with a master control system. The method comprises the steps that the temperature comparison circuits are used for monitoring the temperature of multiple insulated gate bipolar transistors in parallel connection with single-phase bridge arms in the converter in real time, obtaining the maximum value of the temperature, monitoring the temperature of all power devices in a power loop in real time and conducting speed control over a heat dissipation fan arranged at the top with the temperature of the power devices serving as the controlled quantity. In terms of the application occasion with a large power change range, under the condition that certain heat dissipation redundancy is guaranteed, unnecessary energy waste can be avoided, the system efficiency of the converter is improved, and the reliability of the converter which is operated continuously in various complex environments is guaranteed.