Fuzzy control method and device of phase shift full-bridge ZVS DC-DC

• Main Authors: XU YINGNIAN, SU MIN, TIAN YIFAN
• Format: Patent
• Language: Chinese; English
• Published: 26.10.2018
• 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

The invention discloses a fuzzy control method and device of a phase shift full-bridge ZVS DC-DC. The method comprises steps of firstly sampling and acquiring output voltage of the phase shift full-bridge ZVS DC-DC; then, comparing the output voltage with a given value so as to obtain a deviation signal and the deviation change rate; using the deviation signal and the deviation change rate as input quantity of a fuzzy controller; and through fuzzy reasoning synthesis, carrying out defuzzification to output proportional integral parameters so as to adjust a proportional integral controller to allow the output voltage to have good dynamic responses in case of disturbance and be stabled at a rated value. Thus, a technical problem is solved that when load disturbance conditions are complex anddisturbance is frequent, the output voltage greatly drops and the recovery time is long after the output voltage drops. Robustness of a converter is improved and dynamic performance during sudden load disturbance is improved