Patent ID: 9608618
Date: 2017-03-28
CPC Classifications: H03K

Claim:
1. A gate driving circuit for driving a power conversion switching element by charging and discharging a gate electrode of the switching element, the gate driving circuit comprising: a temperature detection circuit for detecting a temperature of the switching element; a current source for causing a forward current to flow to the temperature detection circuit; an amplifier circuit for amplifying a forward voltage of the temperature detection circuit and adjusting the amplified voltage in accordance with an offset voltage; a current adjustment circuit for adjusting a magnitude of a gate current caused to flow to the gate electrode of the switching element, on the basis of an output voltage of the amplifier circuit; and a drive circuit for receiving an external signal and turning ON/OFF the switching element, wherein the magnitude of the gate current caused to flow from the current adjustment circuit to the gate electrode of the switching element is adjusted on the basis of a change in a magnitude of the forward voltage corresponding to a change in the temperature of the temperature detection circuit, the amplifier circuit includes a first operational amplifier and a Zener diode that is provided between the first operational amplifier and the current adjustment circuit, the first operational amplifier amplifies the forward voltage of the temperature detection circuit, and the Zener diode adjusts the amplified voltage in accordance with an offset voltage.