JPH0237539U

JPH0237539U -

Info

Publication number: JPH0237539U
Application number: JP11628088U
Authority: JP
Priority date: 1988-09-02
Filing date: 1988-09-02
Publication date: 1990-03-13

Description

[Brief explanation of drawings]

第１図ないし第４図は本考案の一実施例を示し
、第１図は一部ブロツクを含む全体的な電気回路
図、第２図は異常検出回路の電気回路図、第３図
及び第４図は分圧回路の出力状況を示す波形図で
ある。そして第５図は単相３線式の配電系統に対
する電気機器の接続例を示す回路図である。図中、４は保護スイツチ、５は手動電源オンス
イツチ、６は手動電源オフスイツチ、７は異常検
出回路、８は分圧回路、９は基準電圧発生回路、
１０は比較回路、１１はスイツチ駆動手段である
。 1 to 4 show an embodiment of the present invention, in which FIG. 1 is an overall electrical circuit diagram including some blocks, FIG. 2 is an electrical circuit diagram of an abnormality detection circuit, and FIGS. FIG. 4 is a waveform diagram showing the output status of the voltage dividing circuit. FIG. 5 is a circuit diagram showing an example of how electrical equipment is connected to a single-phase three-wire power distribution system. In the figure, 4 is a protection switch, 5 is a manual power on switch, 6 is a manual power off switch, 7 is an abnormality detection circuit, 8 is a voltage dividing circuit, 9 is a reference voltage generation circuit,
10 is a comparison circuit, and 11 is a switch driving means.

Claims

[Scope of utility model registration request]

Household electrical equipment that uses a 100V power supply from a single-phase three-wire power distribution system, including a voltage divider circuit that divides the input voltage at a predetermined ratio, a reference voltage generation circuit that generates a constant reference voltage from the input voltage, and An abnormality detection circuit comprising a comparison circuit that compares the divided voltage with a reference voltage and outputs an abnormality detection signal when the divided voltage exceeds the reference voltage, and a protection switch interposed in the power supply line in the equipment. and a switch driving means for opening the protection switch when an abnormality detection signal is given from the abnormality detection circuit.