IGBT drive circuit-EEWORLD

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Figure 2 IGBT drive circuit

The function of the whole circuit board is equivalent to an optocoupler isolation amplifier circuit. Its core part is the chip HCPL-316J, in which the controller (DSP-TMS320F2812) generates XPWM1 and XCLEAR* signals and outputs them to HCPL-316J, and the IGBT fault signal FAULT* generated by HCPL-316J is sent to the controller. At the same time, a push-pull output circuit composed of NPN and PNP is connected to the output end of the chip, in order to improve the output current capability and match the IGBT drive requirements. When the output end VOUT of HCPL-316J is high, the upper tube (T1) of the push-pull circuit is turned on, the lower tube (T2) is turned off, and the output end of the three-terminal voltage regulator block LM7915 is added to the IGBT gate (VG1), the IGBT VCE is 15V, and the IGBT is turned on. When the output end VOUT of HCPL-316J is low, the upper tube (T1) is turned off, the lower tube (T1) is turned on, VCE is -9V, and the IGBT is turned off. The above is the on-off process of IGBT.

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