Abstract: The present invention relates to a non-circulating-current phase-shift control method and system for a dual-active-bridge (DAB) converter. This method addresses the issue of circulating power arising from voltage mismatch between the primary and secondary sides of the DAB converter, which otherwise results in increased current stress, higher power losses, and elevated system costs. To eliminate circulating current, the proposed control strategy constrains the ratio between 1-D1 and 1-D3, denoted as a, based on the primary-side and secondary-side voltages as well as the transformer turns ratio. A normalized transmitted power Y is then calculated, and the optimal set of phase-shift ratios D1, D2 and D3 is selected to minimize both switching and conduction losses under non-circulating-current power transfer, thereby enabling high-efficiency operation. The method further ensures zero-voltage turn-on for all switches and zero-current turn-off for half of the switches, significantly reducing switching losses.

Abstract: Disclosed is a wireless power supply smart door lock, comprising: a wireless power transmission control device mounted on a door frame; the wireless power transmission control device comprises a first main control unit and a wireless power transmission coil, a first wireless power conversion unit, a first communication unit and a door body state detecting unit electrically connected to the first main control unit; the wireless power receiving control device comprises a second main control unit and a wireless power receiving coil, a second wireless power conversion unit, an energy storage unit and a second communication unit electrically connected to the second main control unit; the first main control unit detects the acquired door opening or closing state information and the energy storage unit electric quantity information obtained by the communication interaction in real time according to the door body state detecting unit, and determines whether to trigger the wireless power transmission coil to transmit

Abstract: Disclosed is a wireless power supply smart door lock, comprising: a wireless power transmission control device mounted on a door frame; the wireless power transmission control device comprises a first main control unit and a wireless power transmission coil, a first wireless power conversion unit, a first communication unit and a door body state detecting unit electrically connected to the first main control unit; the wireless power receiving control device comprises a second main control unit and a wireless power receiving coil, a second wireless power conversion unit, an energy storage unit and a second communication unit electrically connected to the second main control unit; the first main control unit detects the acquired door opening or closing state information and the energy storage unit electric quantity information obtained by the communication interaction in real time according to the door body state detecting unit, and determines whether to trigger the wireless power transmission coil to transmit