JPH0186481U

JPH0186481U -

Info

Publication number: JPH0186481U
Application number: JP18218687U
Authority: JP
Priority date: 1987-11-30
Filing date: 1987-11-30
Publication date: 1989-06-08

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の回路図、第２図は
従来の一例の回路図、第３図は従来の一例を説明
するための図である。５……整流回路、６……平滑回路、７……切換
回路、８……リレードライブ回路、ＣＯＭＰ_１〜
ＣＯＭＰ_３……コンパレータ、Ｄ_１〜Ｄ_５……ダ
イオード、Ｃ_１〜Ｃ_６……コンデンサ、Ｒ_１〜Ｒ
_８……抵抗、ＳＷ_１〜ＳＷ_３……スイツチ、ａ〜
ｄ……端子。 FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a circuit diagram of a conventional example, and FIG. 3 is a diagram for explaining a conventional example. 5... Rectifier circuit, 6... Smoothing circuit, 7... Switching circuit, 8... Relay drive circuit, COMP ₁ ~
COMP ₃ ...Comparator, _D1 - _D5 ...Diode, C1 _- _C6 ...Capacitor, R1 _- R
₈ ...Resistance, _SW1 ~ _SW3 ...Switch, a~
d...Terminal.

Claims

[Claims for Utility Model Registration] A smoothing circuit consisting of first and second capacitors connected in series between the output terminals of a bridge rectifier circuit is connected, and one end of the output terminal of the rectifier circuit and the second capacitor are connected in series. and a switching means for short-circuiting or opening a connection point between the first capacitor and the second capacitor, and converts two types of high and low commercial AC power supply voltages into a predetermined DC voltage by switching the switching means. In a power supply circuit that rectifies and outputs, it is connected to the output terminal of the rectifier circuit, detects the DC voltage, and when the DC voltage is smaller than a set value, shorts the switching means and doubles the voltage from the smoothing circuit. A power supply circuit comprising a switching circuit that outputs a rectified DC voltage, and when the voltage is larger than a set value, opens the switching means to directly switch and output the rectified DC voltage from the smoothing circuit.