JPS60123017U

JPS60123017U - power circuit

Info

Publication number: JPS60123017U
Application number: JP939784U
Authority: JP
Inventors: 芦沢　幸雄
Original assignee: 松下電工株式会社
Priority date: 1984-01-25
Filing date: 1984-01-25
Publication date: 1985-08-19

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例の電源回路の回路図、第２
図は入力される電源電圧と出力電圧との関係を示す特性
図、第３図は第１図の具体回路図、第４図はこの考案の
他の実施例の回路図である。Ｅ・・・・・・商用電源、Ｖト・・・・・電源トランス
、Ｄ□〜Ｄ１１−−−−−７ダイオート、ｓｗ、Ｓｗ′
・・・・・・スイッチ回路、ＤＴ、　ＤＴ’・・・・・
・電圧検出回路、Ｃ□・・・・・・平滑コンデンサ、Ｔ
ｒ、１．Ｔｒ２．Ｔｒ３・・・・・・トランジスタ、Ｒ
１〜Ｒ５・・・・・・抵抗、Ｃ２・・・・・・コンデン
サ、ｂ・・・・・・ツェＦ４３ＣＭＤ５　　　　　− ｕ　　　　　　　１００Ｖ　２００Ｖ　　−□電源ｔｆ
ＥFigure 1 is a circuit diagram of a power supply circuit according to an embodiment of this invention;
The figure is a characteristic diagram showing the relationship between the input power supply voltage and the output voltage, FIG. 3 is a specific circuit diagram of FIG. 1, and FIG. 4 is a circuit diagram of another embodiment of the invention. E...Commercial power supply, Vt...Power transformer, D□~D11---7 diode, sw, Sw'
...Switch circuit, DT, DT'...
・Voltage detection circuit, C□...Smoothing capacitor, T
r, 1. Tr2. Tr3...Transistor, R
1~R5...Resistor, C2...Capacitor, b...Tse F43CMD5 - u 100V 200V -□Power supply tf
E

Claims

[Scope of utility model registration request]

(1) A first secondary output terminal that generates a desired voltage when a low-voltage commercial power supply voltage is input to the primary side, and a first secondary output terminal that generates the desired voltage when a high-voltage commercial power supply voltage is input to the character 1 side. a power transformer having a second secondary output terminal that produces a voltage;
a voltage detection circuit that generates an output when the voltage input to the primary side of the power transformer is higher than an intermediate voltage between the low voltage and the high voltage, and a first secondary output terminal of the power transformer; a first switch circuit connected between the other end of the switch circuit and the load, the switch circuit being connected at one end and being conductive when the voltage detection circuit is not outputting, and being cut off when the voltage detection circuit is outputting an output; a second full-wave rectifier connected between a second secondary output terminal of the power transformer and the load.

(2) The switch circuit includes a diode bridge connected between a pair of AC input terminals between the first secondary output terminal of the power transformer and the first full-wave rectifier; The voltage detection circuit includes a first transistor connected between DC output terminals, a resistor that allows a base current to flow through the first transistor, and a photocoupler light receiving section that bypasses the base current when conducting. A rectifying and smoothing circuit that rectifies and smoothes the voltage at the first secondary output terminal of the , a Zener diode that conducts when the output voltage of this rectifying and smoothing circuit is higher than a predetermined value, and a current that flows through this Zener diode as a base current. a second transistor given and this second
and a photocoupler light-emitting section that lights up when the transistor is turned on.

(3) The switch circuit includes a diode bridge connected between a pair of AC input terminals between the first secondary output terminal of the power transformer and the first full-wave rectifier; The voltage detection circuit includes a rectifying and smoothing circuit that rectifies and smoothes the voltage at the first secondary output terminal of the power transformer, and a photo-receiving section of a photocoupler connected between the DC output terminals. a Zener diode that conducts when the output voltage is higher than a predetermined value;
A first transistor to which the current flowing through the Zener diode is given as a base current, a second transistor that turns on and off in response to the on and off of this first transistor, and a photocoupler that lights up when the second transistor is turned on. A power supply circuit according to claim (1) of the utility model registration claim, which comprises a light emitting section.