Patent ID: 11936370
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The protection device according to claim 1, wherein:
the protection circuit includes a current generation circuit configured to generate the second current;
the current generation circuit includes a voltage generation circuit configured to generate a voltage of which a value is configured to be changed according to the temperature of the power semiconductor, a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor; and
a non-inverting input terminal of the first operational amplifier is connected to the voltage generation circuit, an inverting input terminal of the first operational amplifier is connected to an output terminal of the first operational amplifier and a first terminal of the first resistor, a non-inverting input terminal of the second operational amplifier is connected to a first terminal of the third resistor and a first terminal of the fourth resistor, an inverting input terminal of the second operational amplifier is connected to a second terminal of the first resistor and a first terminal of the second resistor, an output terminal of the second operational amplifier is connected to a second terminal of the second resistor and a first terminal of the fifth resistor, a second terminal of the fourth resistor is connected to a second terminal of the fifth resistor and the capacitor, and a second terminal of the third resistor is connected to a ground terminal.