JPS59183185U

JPS59183185U - Switching regulator inrush current suppression circuit

Info

Publication number: JPS59183185U
Application number: JP7806683U
Authority: JP
Inventors: 博之三宅
Original assignee: 株式会社明電舎
Priority date: 1983-05-24
Filing date: 1983-05-24
Publication date: 1984-12-06
Also published as: JPS642545Y2

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図は従来のスイッチングレギュレータの回路図、第
２図はスイッチングトランスの制御波形図、第３図は本
考案の一実施例を示す回路図、第４図は第３図における
抵抗とサーミスタの取付構成を例示する図、第５図は第
３図におけるサーミスタの温度−抵抗特性例を示す図、
第６図は本考案の動作を説明するための抵抗とサーミス
タの時間一温度特性図である。　　・４・・・突入電流抑制用サイリスク、５．１８・・・突
入電流抑制用抵抗、７．１７・・・スイッチングトラン
ス、８・・・スイッチングトランジスタ、９・・・制御
回路、１２・・・負荷、１９・・・負特性サーミスタ、
２０・・・プリント基板。Fig. 1 is a circuit diagram of a conventional switching regulator, Fig. 2 is a control waveform diagram of a switching transformer, Fig. 3 is a circuit diagram showing an embodiment of the present invention, and Fig. 4 is a diagram of the resistor and thermistor shown in Fig. 3. A diagram illustrating the mounting configuration; FIG. 5 is a diagram illustrating an example of the temperature-resistance characteristic of the thermistor in FIG. 3;
FIG. 6 is a time-temperature characteristic diagram of a resistor and a thermistor for explaining the operation of the present invention.・ 4... Cyrisk for inrush current suppression, 5.18... Resistor for inrush current suppression, 7.17... Switching transformer, 8... Switching transistor, 9... Control circuit, 12... Load, 19...Negative characteristic thermistor,
20...Printed circuit board.

Claims

[Scope of utility model registration request]

A smoothing capacitor is used as a DC input from the DC main circuit that rectifies the AC current to a series circuit of a switching transformer and a switching element, and the switching element is periodically controlled on and off by a control circuit to control the output of the switching transformer. In a switching regulator that supplies stabilized DC power to a load through rectification and smoothing, the DC main circuit is provided with a resistor and a negative temperature sensing element closely connected in parallel to each other to suppress inrush current to the capacitor. A resistor for suppressing inrush current in older switching regulators.