Fault early warning and protection circuit for inverter IGBT (Insulated Gate Bipolar Translator)

• Main Authors: WEI TONGZHEN, YIN JINGYUAN, SHI CHANGLI, WU LIXIN, HAN LIBO, HUO QUNHAI, ZHANG TONGSHUO
• Format: Patent
• Language: Chinese; English
• Published: 15.01.2019
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to a fault early warning and protection circuit for an inverter IGBT (Insulated Gate Bipolar Translator). The circuit comprises a current sampling circuit, a signal conditioningcircuit, a partial pressure conditioning circuit, a signal triggering circuit, a resistor and an IGBT switching device, wherein the current sampling circuit collects IGBT emitting electrode current and converts a current signal to a voltage signal; the voltage signal output by the current sampling circuit is converted into a stable voltage signal through the signal conditioning circuit; the voltage signal is converted into the input signal of the signal triggering circuit through the partial pressure conditioning circuit, and the input signal is output as a fault signal; and the output signalgenerated by the signal triggering circuit is connected with an IGBT grid electrode through the resistor, and meanwhile, the output signal is connected with a driving signal through the resistor. Whenthe IGBT is subjected to s