JPH02110990U

JPH02110990U -

Info

Publication number: JPH02110990U
Application number: JP1926589U
Authority: JP
Priority date: 1989-02-21
Filing date: 1989-02-21
Publication date: 1990-09-05

Description

[Brief explanation of the drawing]

第１図は本考案に係る外部可変形電源回路の第
１実施例を示す回路図、第２図は第１実施例で用
いる可変直流電圧源の具体例の回路図、第３図は
第１実施例の動作説明用のグラフ、第４図乃至第
６図は制御素子を複数個直結した制御増幅器の具
体例をそれぞれ示す回路図、第７図は本考案の第
２実施例を示す回路図、第８図は本考案の第３実
施例を示す回路図、第９図乃至第１１図は制御素
子を複数個直結した制御増幅器の他の具体例をそ
れぞれ示す回路図、第１２図は本考案の第４実施
例を示す回路図、第１３図は外部可変形電源の第
１従来例を示す回路図、第１４図は第２実施例を
示す回路図、第１５図は第３実施例を示す回路図
、第１６図は第４実施例を示す回路図である。１……整流平滑回路、２……可変直流電圧源、
３，４……入力端子、５，５Ａ，５Ｂ，５Ｃ，６
，６Ａ，６Ｂ，６Ｃ……出力端子、１０……自励
発振回路、１１……反転増幅器、１２……制御回
路、１５……ボルテージフオロア、Ｑ１乃至Ｑ７
……トランジスタ、Ｒ１乃至Ｒ１２……抵抗、Ｄ
Ｚ１乃至ＤＺ４……定電圧ダイオード、ＶＲ１，
ＶＲ２……可変抵抗器、Ｃ１乃至Ｃ８……コンデ
ンサ。 FIG. 1 is a circuit diagram showing a first embodiment of an external variable power supply circuit according to the present invention, FIG. 2 is a circuit diagram of a specific example of a variable DC voltage source used in the first embodiment, and FIG. Graphs for explaining the operation of the embodiment, FIGS. 4 to 6 are circuit diagrams showing specific examples of a control amplifier in which a plurality of control elements are directly connected, and FIG. 7 is a circuit diagram showing a second embodiment of the present invention. , FIG. 8 is a circuit diagram showing a third embodiment of the present invention, FIGS. 9 to 11 are circuit diagrams showing other specific examples of a control amplifier in which a plurality of control elements are directly connected, and FIG. 12 is a circuit diagram showing a third embodiment of the present invention. A circuit diagram showing a fourth embodiment of the invention, FIG. 13 is a circuit diagram showing a first conventional example of an external variable power source, FIG. 14 is a circuit diagram showing a second embodiment, and FIG. 15 is a third embodiment. FIG. 16 is a circuit diagram showing the fourth embodiment. 1... Rectifier smoothing circuit, 2... Variable DC voltage source,
3, 4...Input terminal, 5, 5A, 5B, 5C, 6
, 6A, 6B, 6C...output terminal, 10...self-excited oscillation circuit, 11...inverting amplifier, 12...control circuit, 15...voltage follower, Q1 to Q7
...Transistor, R1 to R12...Resistance, D
Z1 to DZ4... Constant voltage diode, VR1,
VR2...variable resistor, C1 to C8...capacitors.

Claims

[Claims for Utility Model Registration] A self-excited oscillation circuit that switches DC input using a switching element connected in series to the primary winding of an oscillation transformer, and rectifies the AC output induced in the secondary winding of the oscillation transformer. An external variable power supply circuit comprising a rectifying and smoothing circuit for smoothing, and a resistance means for detecting an output current or voltage of the rectification and smoothing circuit, and controlling the self-excited oscillation circuit using the detected voltage by the resistance means. , a control element or a control amplifier to which a plurality of control elements are directly connected is provided in the base circuit of the switching element, and an external control voltage having a polarity opposite to that of the detection voltage is applied in series to the resistance means, so that the detection voltage and the control amplifier are connected in series. An external variable power supply circuit characterized in that a voltage value superimposed on an external control voltage is applied to a control pole of the control element or control amplifier.