Diode clamp mixed three-level double-active full-bridge current transformer and control method thereof

• Main Authors: TONG ANPING, LI GUOJIE, HANG LIJUN
• Format: Patent
• Language: Chinese; English
• Published: 10.05.2019
• 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 provides a diode clamp mixed three-level double-active full-bridge current transformer. Based on the double-active full-bridge current transformer, a two-level bridge arm at a primary side is replaced with a diode clamp three-level bridge arm, thereby adding an additional control variable, and enabling the topology to be suitable for a wide-voltage range application occasion. The invention further provides a control method at the same time, the four degrees of freedom global optimal control is realized based on the primary side zero level duty cycle, the primary side high-level duty cycle, the secondary side zero level duty cycle and four phase-shifting controlling quantities between the primary side and the secondary side of the diode clamp mixed three-level double-active full-bridge current transformers; by coordinating the four control variables of the current transformer, the current effective value is reduced, and the current transformer running efficiency is improved. The closed-loop contr