PURPOSE: To realize the miniaturization, a long service life and high reliability of the title circuit as a contactless constitution by providing a thyristor whose one end has been connected to a remove monitor device, a transistor for a gate trigger of the thyristor, and a transistor which is controlled by an output of the thyristor and outputs an alarm release signal.
CONSTITUTION: The title circuit is constituted of a thyristor SCR whose anode has been connected to an operating switch S in a remote monitor device 1, a transistor TR1 for a gate trigger of the thyristor SCR, each transistor TR2 controlled by an output of the thyristor SCR, and a diode D for preventing a reverse current, etc. In such a way, since a relay is not used, said circuit becomes small in size and low in cost, and also, its long service life can be realized. Also, since the thyristor SCR has been used, even if a noise is superposed on its anode, a malfunction scarcely occurs, and the reliability is improved. Moreover, when the thyristor SCR is used, a release signal can be detected as a characteristic of the thyristor, while the operating switch S in the remote monitor device is ON, therefore, an alarm circuit which has utilized this signal can be designed easily.
TAKEO HIROSHI
TAKEDA SATOSHI
NAKADE HIROSHI
MIURA NORIHISA
