JPS60123016U

JPS60123016U - power circuit

Info

Publication number: JPS60123016U
Application number: JP939684U
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 the drawing]

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図の具体回路図である。Ｅ・・・・・・商用電源、阿゛・・・・・・電源トラン
ス、Ｄ１〜Ｄ３・・・・・・ダイオード、ＳＷ・・・・
・・スイッチ回路、ＤＴ・・・・・・電圧検出回路、Ｃ
□・・・・・・平滑コンデンサ、Ｔｒ、、　Ｔｒ２・・
・・・・トランジスタ、Ｒ１−Ｒ１・・・・・・抵抗、
Ｃ２・・・・・・コンデンサ、ＺＤ・・・・・・ツェナ
ーダイオード。Figure 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, and FIG. 3 is a specific circuit diagram of FIG. 1. E...Commercial power supply, A...Power transformer, D1-D3...Diode, SW...
...Switch circuit, DT...Voltage detection circuit, C
□・・・・・・Smoothing capacitor, Tr,, Tr2...
...Transistor, R1-R1...Resistor,
C2... Capacitor, ZD... Zener diode.

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 primary 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 the intermediate voltage between the low voltage and the high voltage; a first secondary output terminal of the power transformer and a load; a switch circuit connected between the switch circuit and the second secondary output terminal of the power transformer and the load, which conducts half-wave when the voltage detection circuit has no output and shuts off when the voltage detection circuit has an output; A power supply circuit comprising a diode connected to the switch circuit and flowing a half-wave power in the same direction as the switch circuit. −

(2) The switch circuit includes a first transistor connected between the first secondary output terminal of the power transformer and the load, and a resistor that causes a penis current to flow through the transistor of the rod 1, The voltage detection circuit includes a Zener diode that conducts when a voltage obtained by half-wave rectifying the voltage at the first secondary output terminal of the power transformer exceeds a predetermined value, and a current flowing through the Zener diode is provided as a base current. and a second transistor that bypasses the base current supplied to the first transistor by turning on and conducting.
Power supply circuit described in section 1). ,