Current control circuit

A current control circuit, comprising:

• a first drive switching device;
• a gate power source;
• a control switching device connected between the gate power source and a gate of the first drive switching device;
• a first resistor connected between the control switching device and the gate of the first drive switching device;
• an operational amplifier including an output terminal, an inverting input terminal, and a non-inverting input terminal, the output terminal being connected to a gate of the control switching device, and the non-inverting input terminal being configured to receive a potential of a terminal of the control switching device on a first drive switching device side;
• and
• a switching circuit configured to:
• input a potential to the 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, the potential being a sum of a first reference potential and a potential of a terminal of the first resistor on the first drive switching device side;
• and
• input a second reference potential to the inverting input terminal of the operational amplifier 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.

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;
• and
• an operational amplifier including an output terminal connected to a gate of the control switching device,
• wherein the operational amplifier is configured to:
• control a potential of the gate of the control switching device so that a potential difference between both ends of the first resistor does not exceed a first reference value, 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
• control the potential of the gate of the control switching device so that a potential on a current pathway between the control switching device and the gate of the first drive switching device is changed to a second reference value, 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.