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    • 2. 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.
    • 3. 发明申请
    • PULSE WIDTH MODULATION SYSTEM PROVIDED WITH SYNCHRONIZED CONTROL BOARDS
    • WO2022268592A1
    • 2022-12-29
    • PCT/EP2022/066256
    • 2022-06-15
    • BOMBARDIER TRANSPORTATION GMBH
    • GALIC, JohannBERGMAN, MagnusTROSTÉN, TorbjörnJOHANSSON, Mikael H.
    • H02M7/5387H02M1/14H02M1/00H02M1/0041H02M1/0043H02M1/0074H02M7/53873
    • A pulse width modulation (PWM) system (2) comprising a plurality of module building blocks (41-44), where each building block is connected to and controlled by a control board (61-64), each module building block comprises a set of function modules (81-85), provided with pulse width modulated phase outputs (101-105) adapted to be connected to predetermined loads. Each module building block (41-44) is connected to a direct current (DC) link, and that the control boards (61-64) are connected to each other via a communication bus (12), one of the control boards is a master control board (61) and the others are slave control boards (62, 63, 64). Each slave control board (62, 63, 64) is configured to determine a fictive master board timer based upon timer information received via said communication bus (12), and is further configured to synchronize the timer rate of a slave board timer (142, 143, 144) to a timer rate of the master control board, or of an external timer rate. The timer information further comprises interlacing angle information defining an interlacing point for each of the control boards receiving the timer information, wherein the interlacing angles of a plurality of control boards are determined in relation to each other such that the variation of at least one predetermined operation parameter, related to the loads connected to said pulse width modulated phase outputs of said function modules, is minimized. Preferably, at least two control boards, for which the interlacing angles are determined, are arranged to control function modules at different module building blocks.