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    • 4. 发明申请
    • POWER SUPPLY UNIT
    • WO2021130464A1
    • 2021-07-01
    • PCT/GB2020/052571
    • 2020-10-14
    • DYSON TECHNOLOGY LIMITED
    • GREETHAM, Stephen
    • H02J7/00H02M3/335H02J7/0014H02J7/0016H02M1/0048H02M1/0074H02M3/33569H02M3/337
    • A power supply unit comprising a first battery unit and a second battery unit connected in series, a transformer having a tapped primary winding, a first switch connected between the positive terminal of the first battery unit and a first end of the primary winding, a second switch connected between the negative terminal of the second battery unit and a second end of the primary winding, and a controller for controlling the first switch and the second switch. The tapped terminal of the primary winding is connected to a node located between the two battery units. The power supply unit further comprises a first return path that provides unidirectional current flow from a first node to a second node, and a second return path that provides unidirectional current flow from a third node to a fourth node. The first node is located between the negative terminal of the second battery unit and the second switch, the second node is located between the first switch and the first end of the primary winding, the third node is located between the second end of the primary winding and the second switch, and the fourth node is located between the positive terminal of the first battery unit and the first switch.