GaN over-current protection circuit and method working at high frequency

• Main Authors: YANG CHEN, HOU HUIYUN, CAI JIANFEI, XU FANGQIAO, WU YINCHAO, LU JIANNING
• Format: Patent
• Language: Chinese; English
• Published: 13.09.2022
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The invention provides a GaN over-current protection circuit and method under high-frequency work, and the circuit comprises a sampling module which is connected in parallel with two ends of a GaN power switch tube, and is used for collecting the drain-source voltage of the GaN power switch tube and the voltage drop of a diode, and outputting the detected voltage to a judgment module. The output end of the judgment module is connected with the controller, and the judgment module is used for comparing the received voltage with the reference voltage, generating a corresponding judgment signal and feeding back the judgment signal to the control module; the input end of the control module is connected with the judgment module, and the control module is used for receiving the judgment signal sent by the judgment module, performing logic AND processing on the judgment signal and a preset PWM signal to generate a driving signal, and outputting the driving signal to the driving module; the input end of the driving mo