JPS602388U

JPS602388U - DC/DC converter power supply

Info

Publication number: JPS602388U
Application number: JP6567784U
Authority: JP
Inventors: 洋一植木; 敏文鷲尾
Original assignee: 富士通株式会社
Priority date: 1984-05-04
Filing date: 1984-05-04
Publication date: 1985-01-09

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の電源装置の出力電圧・出力電流特性を示
す図、第２図は改良された電源装置の出力電圧・出力電
流特性を示す図、第３図は本考案の一実施例の接続図、
第４図は第３図の実施例における主スイツチング素子の
制御パルスの時間幅の制御の説明図、第５図は第３図の
実施例における１次側の過負荷電流の検出の説明図であ
る。Ｖ。・・・出力電圧、Ｖｎ・・・出力定格電圧、Ｉ。・
・・出力電流、Ｉｎ・・・出力定格電流、Ｓ・・・直流
電源、ＯＳＣ・・・三角波発振回路、■・・・パルス幅
制御回路、■・・・ドライバ回路、■・・・過電流検出
回路、■・・・出力電圧検出回路、ＳＴ・・・主スイツ
チング素子、ＴＲ・・・トランス、Ｄ・・・整流器、Ｃ
Ｈ−・・チョーク、ｃｏ・・・コンデンサ、Ｌ・・・負
荷、Ｒ□、　Ｒ２，Ｒ３・・・抵抗、ｃｏＭｌ。Ｃ０Ｍ２・・・比較回路、ＡＭＰ・・・増幅器、ＰＴ・
・・ホトトランジスタ、ＬＥＤ・・・発光ダイオード（
両者でホトカプラを構成）。Fig. 1 is a diagram showing the output voltage and output current characteristics of a conventional power supply device, Fig. 2 is a diagram showing the output voltage and output current characteristics of an improved power supply device, and Fig. 3 is a diagram showing the output voltage and output current characteristics of an improved power supply device. Connection diagram,
FIG. 4 is an explanatory diagram of the control of the time width of the control pulse of the main switching element in the embodiment of FIG. 3, and FIG. 5 is an explanatory diagram of the detection of overload current on the primary side in the embodiment of FIG. 3. be. V. ...Output voltage, Vn...Output rated voltage, I.・
...output current, In...output rated current, S...DC power supply, OSC...triangular wave oscillation circuit, ■...pulse width control circuit, ■...driver circuit, ■...overcurrent Detection circuit, ■... Output voltage detection circuit, ST... Main switching element, TR... Transformer, D... Rectifier, C
H-...Choke, co...Capacitor, L...Load, R□, R2, R3...Resistance, coMl. C0M2... Comparison circuit, AMP... Amplifier, PT.
...Phototransistor, LED...Light-emitting diode (
Both constitute a photocoupler).

Claims

[Scope of utility model registration request]

An input/output device that controls the main switching element using a control pulse whose pulse width is controlled by a DC voltage level proportional to the output voltage, turns on and off the primary side of the transformer, and rectifies and smoothes the output on the secondary side to obtain a DC output. In an isolated pulse width control switching DC/DC converter type stabilized power supply device, means for obtaining a voltage corresponding to the current on the primary side of the transformer, and a DC voltage proportional to the voltage obtained from the means and the above output voltage. an overcurrent detection circuit including a comparison circuit that compares the current level with the current level and generates an output when the former is greater than the latter;
A DC/DC conversion type power supply device, characterized in that the time width of the control pulse of the main switching element is limited by the output of the comparison circuit. ,