I am trying 3-phase inverter circuit.
I am using IR2110 to switch high and low side MOSFETs. Each MOSFET's gate is connected to the high/low side pins of driver IC. When I apply the PWM input to the gate driver, the MOSFET switches and the circuit works fine. I connected to the load (motor), the motor runs OK.
When I try to check the gate current of the MOSFET (that is, from driver IC output pin to the MOSFET's gate), I notice that zero amps is flowing to the gate. But how?
I am biasing the gate driver IC with 12 volts and I used a 30 ohm resistor in the gate terminal,
I = 12V/30 = 400mA
But when I measure the current it shows "0 amp". I also changed the value from 30 ohms to 10 ohms. But no change, so I think I am wrong somewhere.
Please correct me.