Patent ID: 8736349

Claim:
A current limit circuit apparatus, coupled with the gate of a GaN transistor, the current limit circuit comprises: a diode; a first transistor, a source and a drain of the first transistor coupling with the diode; a second transistor, a source of the second transistor coupling with a gate of the first transistor; a first resistor, the first resistor coupling with the diode and a drain of the first transistor; a second resistor, one end of the second resistor coupling with a source of the second transistor and a first power supply; and a third resistor, one end of the third resistor coupling with a fourth resistor and the gate of the first transistor, another end of the third resistor coupling with a gate of the second transistor and another end of the second resistor; wherein the drain of the first transistor coupling with one end of the diode and a gate of the GaN transistor, the first transistor turning off and a current of the gate of the GaN transistor being limited, when the current of the gate of the GaN transistor exceeding a predetermined value, a breakdown voltage of the GaN transistor being increased by limiting a gate current.