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    • 3. 发明授权
    • Switching circuit for high-voltage thyristors
    • 高压晶闸管开关电路
    • US4264830A
    • 1981-04-28
    • US20361
    • 1979-03-14
    • Franz MaurerRainer WirtzEberhard WeissPeter Zieher
    • Franz MaurerRainer WirtzEberhard WeissPeter Zieher
    • H02M1/08H03K17/722H03K17/73H03K17/79H03K17/72
    • H03K17/73H03K17/79Y10T307/773
    • To turn a thyristor, particularly a high-voltage thyristor, ON, and to connect the thyristor and the utilization circuit to a power source, a charge capacitor is connected to a charging circuit to charge the capacitor when the thyristor is blocked or in OFF state. A controlled switch, typically a transistor 20, is connected to the charge capacitor 19 and connects the charge capacitor to the gate electrode of the thyristor, when the controlled switch is turned ON; a control circuit is connected to the controlled switch which includes an opto-coupler 28 to control its conduction. Preferably, a threshold sensitive element such as a Zener diode 25, or a four-layer diode 30, is included in the controlled switch transistor base circuit to provide for sharp turn-on characteristics. Since the conduction characteristics of the controlled switching transistor 20 will depend on the charge state of the capacitor 19, the controlled switching transistor will be conductive only when the capacitor has a sufficiently high charge for reliable firing of the thyristor.
    • 为了将晶闸管,特别是高压晶闸管导通,并将晶闸管和利用电路连接到电源,充电电容器连接到充电电路,以在晶闸管阻塞或处于断开状态时为电容器充电 。 控制开关(通常为晶体管20)连接到充电电容器19,并且当受控开关导通时,将充电电容器连接到晶闸管的栅电极; 控制电路连接到受控开关,该开关包括光耦合器28以控制其传导。 优选地,诸如齐纳二极管25或四层二极管30之类的阈值敏感元件被包括在受控开关晶体管基极电路中以提供清晰的导通特性。 由于受控开关晶体管20的导通特性将取决于电容器19的充电状态,所以只有当电容器具有足够高的电荷以使晶闸管可靠地烧制时,受控开关晶体管将导通。