Device for opening a circuit and device for protecting the circuit
against surges
    22.
    发明授权
    Device for opening a circuit and device for protecting the circuit against surges 失效
    用于打开电路的装置和用于保护电路免受浪涌的装置

    公开(公告)号:US5408379A

    公开(公告)日:1995-04-18

    申请号:US940976

    申请日:1992-09-04

    摘要: An insulating substrate has a heat generating resistor and an electrical conductor on its surface. A pair of conductors, such as power or communication leads, are connected to a protected circuit. A rated voltage element and the heat generating resistor is connected in series between the lines. The electrical conductor is connected in series between one of the lines and the protected circuit. When a continuous overvoltage greater than a rated voltage of the rated voltage element develops in the lines, the rated voltage element acts to draw excess current through it and the heat generating resistor. When this current reaches a certain point, heat from the overcurrent in the heat generating resistor ruptures the substrate and the electrical conductor so that both the rated voltage element and the circuit are isolated from the conductors. This protects the protected circuit from destruction of, and consequent loss of protection by, the rated voltage element. It also protects the rated voltage element itself by isolating it from the overvoltage.

    摘要翻译: 绝缘基板在其表面上具有发热电阻器和电导体。 一对导体,例如电源或通信引线,连接到受保护的电路。 额定电压元件和发热电阻串联连接在线路之间。 电导体在一条线路和受保护电路之间串联连接。 当在线路中产生大于额定电压元件的额定电压的连续过电压时,额定电压元件用于通过其产生过剩电流和发热电阻器。 当该电流达到某一点时,来自发热电阻器中的过电流的热会破坏基板和电导体,使得额定电压元件和电路都与导体隔离。 这样可以保护受保护的电路免受额定电压元件的破坏和随之而来的保护损失。 它还通过将额定电压元件与过压隔离来保护额定电压元件本身。