Patent ID: 9628073
Date: 2017-04-18
CPC Classifications: H03K

Claim:
1. A current control circuit, comprising: a first drive switching device; a gate power source; a control switching device and a first resistor connected in series between the gate power source and a gate of the first drive switching device; an operational amplifier including an output terminal, a non-inverting input terminal, and an inverting input terminal, the output terminal being connected to a gate of the control switching device, and the inverting terminal being configured to receive a reference potential; and a switching circuit configured to: input a value based on a potential difference between both ends of the first resistor to the non-inverting input terminal of the operational amplifier in a case where a current flowing through the first drive switching device while the gate of the first drive switching device is being charged is equal to or smaller than a threshold level; and input a value based on a potential on a current pathway between the control switching device and the gate of the first drive switching device to the non-inverting input terminal in a case where the current flowing through the first drive switching device while the gate of the first drive switching device is being charged is greater than the threshold level.