Frequency converter mainboard and IGBT short-circuit protection circuit

The invention discloses a frequency converter mainboard and an IGBT short-circuit protection circuit. The IGBT short-circuit protection circuit comprises a signal sampling unit and a signal comparisonunit, the signal sampling unit is used for collecting a sampling signal of an IGBT circuit in a frequency converter and transmitting the sampling signal to the signal comparison unit, and the signalcomparison unit is used for comparing whether the sampling signal is smaller than a first preset threshold and greater than a second preset threshold or not, and if not, enabling the signal comparisonunit to generate a short-circuit protection signal and send the short-circuit protection signal to a main controller in the frequency converter. According to the frequency converter mainboard and theIGBT short-circuit protection circuit, the short-circuit time can be shortened, the size of the frequency converter mainboard can be reduced, and the cost can be reduced. 本发明公开了一种变频器主板及IGBT短路保护电路，包括信号采样单元和信号比较单元，信号采样单元用于采集变频器中I