Three-phase isolated converter capable of bidirectional conversion and control method thereof

• Main Authors: HU PENG, TAN WEIMING, LI LUNQUAN, HUANG MIN, ZHOU TAO
• Format: Patent
• Language: Chinese; English
• Published: 26.04.2024
• 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

The invention discloses a bidirectional conversion three-phase isolation type converter and a control method thereof, and the converter comprises an AC composite switch bridge arm group, and a high-frequency absorption unit, a series resonance unit and a high-frequency isolation and transformation unit which are respectively connected with the AC composite switch bridge arm group, and also comprises a rectification inversion unit and a DC absorption and filtering unit, and the high-frequency absorption unit is connected with the series resonance unit. According to the control method disclosed by the invention, PWM (Pulse Width Modulation) driving signals in an enlarged mode, a medium mode and a small mode are applied to the controllable switches in the alternating-current composite switch bridge arm group respectively, and different driving signals are applied to the switching tubes of the rectification unit and the inversion unit, so that boost-buck control of direct-current bidirectional flow is realized, a