JPS62152683U

JPS62152683U -

Info

Publication number: JPS62152683U
Application number: JP3980586U
Authority: JP
Priority date: 1986-03-20
Filing date: 1986-03-20
Publication date: 1987-09-28

Description

[Brief explanation of the drawing]

第１図は本考案に係るスイツチングレギユレー
タの回路構成図、第２図は第１図の発振器要部の
具体的に示す回路図、第３図は従来のスイツチン
グレギユレータを示す回路構成図、第４図は他の
従来例を示す回路構成図、第５図は第４図の回路
で電源オフ時の不安定動作を説明する説明図であ
る。Ｄ１…全波整流回路、Ｄ２〜Ｄ４…整流ダイオ
ード、Ｃ１〜Ｃ４…平滑コンデンサ、Ｔ１…コン
バータトランス、Ｎ１〜Ｎ４…第１〜第４次巻線
、Ｑ１…スイツチングトランジスタ、１２…制御
回路、１３…発振器、１４…パルス幅変調回路、
１５…スイツチ手段、１６…フオトカプラ。 Fig. 1 is a circuit diagram of a switching regulator according to the present invention, Fig. 2 is a circuit diagram specifically showing the main parts of the oscillator shown in Fig. 1, and Fig. 3 is a diagram showing a conventional switching regulator. FIG. 4 is a circuit diagram showing another conventional example, and FIG. 5 is an explanatory diagram illustrating the unstable operation of the circuit shown in FIG. 4 when the power is turned off. D1... Full-wave rectifier circuit, D2-D4... Rectifier diode, C1-C4... Smoothing capacitor, T1... Converter transformer, N1-N4... First to fourth winding, Q1... Switching transistor, 12... Control circuit, 13... Oscillator, 14... Pulse width modulation circuit,
15...Switch means, 16...Photo coupler.

Claims

[Claims for Utility Model Registration] A converter transformer in which DC voltage from a DC voltage source is supplied to one end of a primary winding and AC voltage is taken out to a secondary winding; connection,
a first rectifier circuit for rectifying the alternating current voltage and supplying the rectified voltage to a first load circuit; and a first rectifier circuit inserted into the output voltage line of the first rectifier circuit to output the rectified voltage to the first load circuit. a switch means for controlling the supply of voltage on and off using a switching signal; a second rectifier circuit for taking out AC voltage from a detection winding provided in the converter transformer and rectifying it to obtain a detection voltage; a third rectifier circuit for extracting alternating current voltage from a winding provided in the converter transformer, rectifying it, and supplying the output voltage to a second load circuit; and a collector connected to the other end of the primary winding of the converter transformer. a switching transistor whose emitter is connected to a reference potential point and whose base is supplied with a switching pulse; and means for supplying a switching pulse to the transistor, the oscillation frequency being such that the switching means is turned on. an oscillator that is switched and controlled by the switching signal so that it is high when it is off and low when it is off; 1. A switching regulator comprising: a control means comprising a pulse width modulation circuit for supplying a signal to a base of a switching transistor; and means for generating the switching signal to be applied to the switching means and the oscillator.