Lecip Corporation

Tadayoshi Samura

Ryoichi Uda

Hideki Shimizu

Makoto Noda

Yoshihiro Matsui

Takahiro Takizuka

Ikuo Suzuki

Yoshihiro Nakamura

Daiki Goshima

An abnormality detection circuit detects abnormality relating to ground fault in secondary winding circuitry of transformer, non-grounding fault of transformer assembly casing or false connection of the AC power source to the transformer assembly in reverse polarity. An interrupter circuit turns a switch off in response to detection of the abnormality by the abnormality detection circuit to interrupt the supply of the AC power to the transformer. When the supply of the AC power is interrupted, the switch is connected to a restart circuit, whereupon the circuit is activated to allow a charging current to flow to a capacitor, which is connected in series in a drive current path of a drive circuit with a time delay on the order of 0.5 to 1.0 second which is determined by a delay circuit thereof. The charging current drives a restoring circuit, which controls the interrupter circuit to its restoring condition temporally so that the switch is turned to its &ldquo;on&rdquo; condition only once.

Sign lamp lighting transformer with protective functions

Growing community of inventors

Gifu, Japan

Tadayoshi Samura