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Grid overvoltage protection circuit

2016-09-27 11:04  
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Grid overvoltage protection circuit
Reasons for grid's overvoltage: 1. Static electricity on the grid capacitance cancause overvoltage.2. Capacitance mueller effect causes grid overvoltage.To prevent the IGBT grid-emitter from overvoltge, a resistance with dozen kilohm should be connected between the grid and emitter of IGBT in parallel. As the figure is shown, the resistance should beclosed to the grid and emitter.