JPH0184117U

JPH0184117U -

Info

Publication number: JPH0184117U
Application number: JP1987176945U
Authority: JP
Priority date: 1987-11-19
Filing date: 1987-11-19
Publication date: 1989-06-05

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例を示すシヤントレ
ギユレータ回路の回路ブロツク図、第２図は従来
の定電流回路およびシヤントレギユレータ部の回
路ブロツク図である。図中、１は定電流回路、１ａは抵抗、１ｂは基
準電圧源、１ｄは定電流制御トランジスタ、１ｃ
，２ｃ，３ｃはオペレーシヨナルアンプ、２ａは
抵抗、２ｂは定電圧ダイオード、２ｄは定電圧制
御トランジスタ、３ａは抵抗、３ｂは基準電圧発
生器、３ｂ_１は電源、３ｂ_２は可変抵抗器である
。 FIG. 1 is a circuit block diagram of a shunt regulator circuit showing an embodiment of this invention, and FIG. 2 is a circuit block diagram of a conventional constant current circuit and shunt regulator section. In the figure, 1 is a constant current circuit, 1a is a resistor, 1b is a reference voltage source, 1d is a constant current control transistor, 1c
, 2c, and 3c are operational amplifiers, 2a is a resistor, 2b is a constant voltage diode, 2d is a constant voltage control transistor, 3a is a resistor, 3b is a reference voltage generator, _3b1 is a power supply, and _3b2 is a variable resistor. .

Claims

[Claims for Utility Model Registration] (1) A constant current circuit consisting of a constant current control transistor, etc. that supplies a constant current to a load, and a constant voltage that maintains a constant voltage applied to the load when supplying the constant current. In a shunt regulator circuit formed by combining a shunt regulator section consisting of a control transistor, etc., a shunt current flowing through the shunt regulator section is detected, and the output current is controlled based on the detected shunt current. output current control means for controlling a transistor to change a constant current supplied to the load; controlling the constant current control transistor according to the load current to change a set constant current value of the constant current control transistor; A shunt regulator circuit characterized by: (2) In the utility model registration claim (1), the output current control means includes a resistor that detects the shunt current and converts it into a predetermined voltage, and a reference voltage that generates a reference voltage that is a reference for changing the constant current. an operational amplifier that compares the converted voltage with a reference voltage and outputs a predetermined voltage to the constant current control transistor to reduce the constant current when the converted voltage is larger than the reference voltage. ,
A shunt regulator circuit that controls the constant current control transistor to reduce the value of the constant current when the load current is equal to or less than a predetermined value.