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    • 8. 发明申请
    • DRIVE CIRCUIT FOR FAST SWITCHING OF DARLINGTON-CONNECTED TRANSISTORS
    • 用于快速切换DARLINGTON连接晶体管的驱动电路
    • WO1987003153A1
    • 1987-05-21
    • PCT/US1986002428
    • 1986-11-10
    • SUNDSTRAND CORPORATION
    • SUNDSTRAND CORPORATIONSHEKHAWAT, Sampat, S.DHYANCHAND, P., John
    • H03K17/60
    • H03K17/615H03K17/04126
    • Prior circuits for rapidly switching Darlington-connected transistors between on and off states have accomplished relatively fast switching by applying reverse base drive to the transistors to quickly sweep the excess carriers therefrom. However, such circuits have not accomplished the required degree of reduction of turn off time and have induced localized ''hot spots'' in the base-collector junctions of the transistors. In order to overcome these problems, a drive circuit (26) according to the present invention includes first (40) and second (48) power sources of first and second polarities, a turn-on network (38) coupled between the first power source (40) and the control electrode of a driver transistor (Q4) of a Darlington-connected pair (Q4-Q6) for selectively turning on the transistor pair, turn-off capacitors (C4, C5, C6) coupled between the turn-on network (38) and the control electrodes of each of the transistors (Q4-Q6) and a turn-off network (46) coupled between the capacitors (C4-C6) and the second power source (48) for coupling the second power source (48) to the capacitors (C4-C6) to rapidly turn off the transistors (Q4-Q6). Means (C2, C3) are included for providing a dwell interval between operation of the turn-on network (38) and operation of the turn-off network (46) to allow recombination of excess carriers in the transistors (Q4-Q6) to minimize the incidence of localized hot spots.
    • 用于在导通和截止状态之间快速切换达林顿连接的晶体管的现有电路通过对晶体管施加反向基极驱动来快速扫描多余的载流子而实现了相对快速的切换。 然而,这种电路没有实现所需的关断时间的降低程度,并且在晶体管的基极 - 集电极结中引起局部“热点”。 为了克服这些问题,根据本发明的驱动电路(26)包括第一和第二极性的第一(40)和第二(48)电源,连接在第一电源 (40)和用于选择性地导通晶体管对的达林顿连接对(Q4-Q6)的驱动晶体管(Q4)的控制电极,关闭电容器(C4,C5,C6) 网络(38)和每个晶体管(Q4-Q6)的控制电极和耦合在电容器(C4-C6)和第二电源(48)之间的关断网络(46),用于将第二电源 (48)连接到电容器(C4-C6)以快速关断晶体管(Q4-Q6)。 包括装置(C2,C3),用于在开启网络(38)的操作和关断网络(46)的操作之间提供驻留间隔,以允许将晶体管(Q4-Q6)中的过量载流子复合到 尽量减少局部热点的发生。