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ICBT Grid Electrode Driving Control Power Circuit

2014-11-20 14:34  
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ICBT Grid Electrode Driving Control Power Circuit
The ICBT grid driving circuit itself is using the hybrid method. Its internal optocoupler type, high-voltage type IC would make it small. But the control power, which provide power for the grid electrode driving circuit, should use the transformer and smoothing capacitor and so on. For the driving circuit overall miniaturization, it should consider the miniaturization of these elements. So it would take different ways for the control circuit, which are shown in the picture. The picture (a) is transformer method. It is a stable power of which the high and low side IGBT can get the same voltage. The picture (b) is the bootstrap method. The C1 is the bootstrap capacitance. The VD1 should select the high-voltage diode. The inverter's output duty cycle shouldn't be 100%.