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    • 167. 发明公开
    • Self-powered SCR gate drive circuit with optical isolation
    • 分离式SCR-Gateansteuerschaltung mit Optischer。
    • EP0423455A2
    • 1991-04-24
    • EP90115541.6
    • 1990-08-14
    • International Business Machines Corporation
    • Smith, Christopher A.Woodworth, George K.
    • H03K17/78H03K17/722
    • H03K17/79H03K17/7955Y10T307/773
    • The SCR gate driver circuit provides a continuous gate current whenever there is sufficient anode-to-cathode voltage difference across the SCR. This approach herein eliminates the need to monitor and reapply SCR gate current after each commutation due to load current distortions. A self-powered SCR gate drive circuit for driving an SCR device, connected between a voltage source (VA) and a load. A current regulating means (Q2, Q3, Q4) is coupled between the anode and the cathode of said SCR, having an input terminal and has a current output terminal connected to the gate of said SCR, for providing gate drive current (IG) to said SCR in response to a signal at said input terminal. A photo transistor (IC1b) is coupled between said input terminal of said regulator and said voltage source, having a switchable light source (IC1a) proximate thereto connected to an input control signal source (VC), for providing an energizing signal to said regulator in response to a signal from said control signal source. Said regulator and said photo transistor powered by said voltage source.
    • SCR栅极驱动器电路每当跨SCR存在足够的阳极至阴极电压差时,提供连续的栅极电流。 这种方法消除了由于负载电流失真而在每次换向之后监视和重新施加SCR栅极电流的需要。 一种用于驱动连接在电压源(VA)和负载之间的SCR器件的自供电SCR栅极驱动电路。 电流调节装置(Q2,Q3,Q4)耦合在所述SCR的阳极和阴极之间,具有输入端,并且具有连接到所述SCR的栅极的电流输出端,用于将栅极驱动电流(IG)提供给 所述SCR响应于所述输入端子处的信号。 光电晶体管(IC1b)耦合在所述调节器的所述输入端和所述电压源之间,具有连接到输入控制信号源(VC)的可连接光源(IC1a),用于向所述调节器提供激励信号 响应于来自所述控制信号源的信号。 所述调节器和由所述电压源供电的所述光电晶体管。