Freezing cycle device

Abstract

Abstract PURPOSE:To improve an operating efficiency and a reliability by a method wherein a protection device operation sensing circuit for use in detecting a presence or a non-presence of at least one operation of an over-current protection deice as well as a high voltage switch are provided. CONSTITUTION:In case that at least one of a high voltage switch 7 and an over-current protection device 8, e.g. a switch 7 is operated, an electrical energization of an exciting coil 2a of a magnet switch 2 is shielded by releasing its normal-closed contact point, resulting in that a contact point of the switch 2 is released. In turn, at a protection device operation sensor circuit 5, an electrical potential at one end point C of a photo-triac 10 is lower than an electrical potential at the point B and a sinusoidal wave voltage is applied to the point B, so that one of the triacs 10 comes electrically conductive to generate light. This emitted light is received by a photo-transistor 11 and then the transistor 11 comes electrically conductive and thus 5V charged in a capacitor C1 is conducted to an earth through the transistor 11. An electrical potential at an input end point E becomes almost 0V, a control part 13 receives this 0V to assume that the switch 7 is operated and its subsequent operation is controlled.

Inventors

• 👤 Yoshinori Murashige
• 👤 村重　義則

Bibliographic Details