DAB full power soft switching control method when voltage transmission ratio is greater than 1

• Main Authors: SHEN KAI, TONG ANPING, HE YUANBIN, HANG LIJUN, LI GUOWEN
• Format: Patent
• Language: Chinese; English
• Published: 27.11.2018
• 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 provides a DAB (Dual Active Bridge) full power soft switching control method when a voltage transmission ratio is greater than 1. The DAB full power soft switching control method when avoltage transmission ratio is greater than 1 controls a corresponding switching device by adjusting PWM output through a digital controller. In the theoretical calculation process, the PWM output is mainly to adjust three phase shift controlled variables: an external phase shift ratio D0 between primary secondary side H bridges of a high-frequency transformer, a primary side bridge internal phaseshift ratio D1, and a secondary side bridge internal phase shift ratio D2, so as to enable a DAB DC converter to achieve soft switching under current optimization in a full power range with a voltagetransfer ratio greater than 1. The DAB full power soft switching control method when a voltage transmission ratio is greater than 1 widens the soft switching range and reduces the power loss of the converter at the same time, i