JPH03107725U

JPH03107725U -

Info

Publication number: JPH03107725U
Application number: JP1538590U
Authority: JP
Priority date: 1990-02-19
Filing date: 1990-02-19
Publication date: 1991-11-06

Description

[Brief explanation of the drawing]

第１図は本考案の電源回路を示す回路図、第２
図は従来の電源回路を示す回路図である。２……電源トランス、３……整流平滑回路、４
……正の直流電源ライン、５……負の直流電源ラ
イン、９……電源コントロール回路、Ｑ１，Ｑ２
……第１第２の制御用トランジスタ、Ｑ３，Ｑ４
……正負の定電圧電源用トランジスタ、Ｄ５，Ｄ
６……ツエナーダイオード。 Figure 1 is a circuit diagram showing the power supply circuit of the present invention, Figure 2 is a circuit diagram showing the power supply circuit of the present invention.
The figure is a circuit diagram showing a conventional power supply circuit. 2... Power transformer, 3... Rectifier smoothing circuit, 4
...Positive DC power line, 5...Negative DC power line, 9...Power control circuit, Q1, Q2
...First and second control transistors, Q3, Q4
...Positive and negative constant voltage power supply transistor, D5, D
6... Zener diode.

Claims

[Claims for Utility Model Registration] (1) A power transformer that converts AC power into voltage, and a first and second transformer connected to the secondary side of the power transformer.
a rectifying and smoothing circuit that generates a DC power source, an input/output electrode connected between the power line of the first DC power source and a first constant voltage power line, and a control electrode connected to the first constant voltage circuit element. A first constant voltage power source active element and an input/output electrode are connected between a power line of the second DC power source and a second constant voltage power line, and a control electrode is connected to a second constant voltage circuit element. A power supply circuit comprising a second constant voltage power supply active element and a power supply control circuit that generates a power on/off control signal, wherein the first power supply circuit is controlled by an output of the power supply control circuit.
a first control element that controls on/off an active element for a constant voltage power supply; and a first control element that controls on/off an active element for a constant voltage power supply; and a first control element that turns on/off the active element for a second constant voltage power supply, which is controlled by the output of the first active element for a constant voltage power supply. A power supply circuit characterized in that it is provided with a second control element for controlling. (2) The power supply circuit according to claim (1), wherein the first and second DC power supplies are positive and negative DC power supplies. (3) The power supply circuit according to claim (1), wherein the first and second constant voltage power supply active elements are transistors whose input/output electrodes correspond to a collector and an emitter, and whose control electrodes correspond to a base. . (4) The power supply circuit according to claim (1), wherein the first and second constant voltage circuit elements are Zener diodes. (5) The power supply circuit according to claim (1), wherein the first and second control elements are control transistors.