Patent ID: 11870360
Assignee: HYUNDAI MOBIS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 10:
11. An operating method of a bidirectional insulating DC-DC converter comprising a step-down circuit configured to step down a voltage applied from a first battery and output the stepped-down voltage to a second battery, a discharge voltage of the first battery being relatively higher than that of the second battery, a step-up circuit configured to step up a voltage applied from the second battery and output the stepped-up voltage to the first battery, and a bidirectional back-to-back semiconductor switch element configured to separate a second voltage stage, the operating method comprising:
(1) when a starting operation of a vehicle is performed, determining whether a failure of the bidirectional insulating DC-DC converter occurs;
(2) when the failure occurs, performing a starting impossible process, and if the failure does not occur, turning the bidirectional back-to-back semiconductor switch element in the second voltage stage of the bidirectional insulating DC-DC converter on and determining whether a difference in voltage between both ends of the bidirectional back-to-back semiconductor switch element occurs;
(3) when the voltage difference occurs, performing the starting impossible process for safety, and when the voltage difference does not occur, operating the step-up circuit of the bidirectional insulating DC-DC converter and charging the first battery;
(4) during the charging of the first battery, performing a diagnosis on the second battery, and when the diagnosis is completed, stopping the operation of the step-up circuit; and
(5) operating the step-down circuit and performing charging of the second battery.