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    • 10. 发明授权
    • H-bridge circuit with protection against crossover conduction
    • H桥电路,防止交叉传导
    • US5309347A
    • 1994-05-03
    • US947105
    • 1992-09-18
    • Alberto PomaVanni PolettoMarco Morelli
    • Alberto PomaVanni PolettoMarco Morelli
    • H03K17/08H02M1/00H02M1/38H03K17/082H03K17/66H02M3/155
    • H02M1/38H03K17/0826H03K17/663
    • An H-bridge circuit which includes four power transistors (an npn pull-down and a pnp pull-up for each of the output terminals). Two control circuits are connected to drive these transistors in a complementary crossover configuration, so that each control circuit can turn on the pull-up transistor on one side of the load and the pull-down transistor on the opposite side of the load. Each of the power transistors is paralleled (base-to-base) by a smaller transistor which provides a scaled current output (proportional to that of the corresponding power transistor) to the opposite control circuit. The control circuit includes static current-thresholding disable logic, which prevents turn-on until the currents through the opposite power devices have declined to threshold levels. Thus, as long as either control circuit is driving one of the pull-up transistors into in the on-state, the other control circuit will not be able to turn on the pull-down transistor which is in series with the active pull-up transistor. This efficiently prevents any condition of unlimited crowbar current, without adding any excess delay or causing any high-impedance condition at the output.
    • 一个H桥电路,包括四个功率晶体管(npn下拉和每个输出端子的pnp上拉)。 连接两个控制电路以以互补的交叉配置驱动这些晶体管,使得每个控制电路可以在负载的一侧上的上拉晶体管和负载的相对侧上的下拉晶体管导通。 每个功率晶体管由较小的晶体管并联(基极到基极),其提供与相对的控制电路成比例的电流输出(与对应的功率晶体管成比例)。 控制电路包括静态电流阈值禁用逻辑,其可以防止导通,直到通过相对的功率器件的电流已经下降到阈值电平。 因此,只要任一控制电路将上拉晶体管中的一个驱动到导通状态,则另一控制电路将不能接通与有源上拉串联的下拉晶体管 晶体管。 这有效地防止了无限制的撬棒电流的任何条件,而不会增加任何超出延迟或在输出端引起任何高阻抗条件。