Kabushiki Kaisha Sanyo Denki Seisakusho

Lecip Corporation

Ryoichi Uda

Makoto Noda

Fumio Ichimiya

Kazuyuki Hayakawa

Yoshihiro Matsui

Hideki Shimizu

Takahiro Takizuka

Ikuo Suzuki

Tadayoshi Samura

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

A step-up transformer is disposed on a wiring substrate on which an inverter which converts a commercial a.c. power into a high frequency power and a ground fault detection circuit are mounted and within a casing . Lead wires which extend from the opposite ends of the secondary winding of the step-up transformer to the outside thereof are mounted upright on the wiring substrate . Coils are disposed on air-core bobbins , which are threaded by the lead wires . Outputs from the coils are fed to a ground fault detection circuit.

Ground fault protection circuit for discharge tube lighting circuit

DC power is converted by an inverter to high-frequency power, which is supplied to the primary winding of a neon transformer. One or more neon tubes are connected in series across the secondary winding of the neon transformer. A saturable reactor is connected across the secondary winding or the neon transformer. The saturable reactor has a characteristic that its magnetic flux is saturated when the output voltage from the secondary winding of the neon transformer increases 1.1 to 2.0 times the rated voltage.

High-frequency power unit for neon tubes

Growing community of inventors

Gifu, Japan

Ryoichi Uda