Direct-current magnetic bias detection circuit and direct-current magnetic bias suppression method for phase-shifted full-bridge converter

• Main Authors: XU YINGNIAN, WANG YUNZHI, ZHAO YONGBING, WANG CHANGMING, WEN GANG, DUAN SHUANGYI, WU HAO
• Format: Patent
• Language: Chinese; English
• Published: 30.04.2024
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention provides a phase-shifted full-bridge converter direct-current magnetic bias detection circuit and a direct-current magnetic bias suppression method, the detection circuit is an eight-order low-pass filter formed by cascading four second-order active low-pass filters, and the detection circuit is used for detecting a primary-side current direct-current component of a high-frequency transformer in a phase-shifted full-bridge converter to realize detection of direct-current magnetic bias. The transfer function of each second-order active low-pass filter is adjusted by adjusting the included angle # imgabs0 # of the dominant pole of the eight-order low-pass filter between the complex plane and the imaginary axis of the complex plane, and the circuit parameters of the eight-order low-pass filter are designed according to the adjusted transfer functions, so that the eight-order low-pass filter meets the performance requirements. According to the invention, an eight-order low-pass filter is designed to