JPS5832513U

JPS5832513U - switching power supply

Info

Publication number: JPS5832513U
Application number: JP12493181U
Authority: JP
Inventors: 郁夫加藤
Original assignee: ティーディーケイ株式会社
Priority date: 1981-08-24
Filing date: 1981-08-24
Publication date: 1983-03-03

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

Description

[Brief explanation of the drawing]

第１図及び第２図は従来のスイッチング電源の各回路図
、第３図は本考案に係るスイッチング電源の回路図、第
４図ａ〜ｈは同じくその出力安定化作用を説明するため
のタイムチャート、第５図、第６図及第７図は同じく他
の別々の実施例における要部の各回路図である。Ｔ□・・・変圧器、Ｎ□、　Ｎ２．　Ｎ３．　Ｎ４・・
・巻線、Ｑ１＋　Ｑ３＋Ｑ、・・・トランジスタ、Ｃ３
・・・コンデンサ、Ｒ６・・・抵抗、５・・・出力安定
化回路、６・・・比較器、７・・・過電流保護回路。Figures 1 and 2 are circuit diagrams of a conventional switching power supply, Figure 3 is a circuit diagram of a switching power supply according to the present invention, and Figures 4a to 4h are timing diagrams for explaining the output stabilizing effect. The charts, FIG. 5, FIG. 6, and FIG. 7 are circuit diagrams of main parts in other separate embodiments. T□...Transformer, N□, N2. N3. N4...
・Winding, Q1+ Q3+Q,...Transistor, C3
... Capacitor, R6... Resistor, 5... Output stabilization circuit, 6... Comparator, 7... Overcurrent protection circuit.

Claims

[Scope of utility model registration request]

(1) A switching power supply in which positive feedback is applied from the output side of the transistor to the input side through the winding of the transformer to produce self-oscillation, and the oscillation output is taken out from the other winding of the transformer. , a capacitor charged by flyback energy generated in the winding of the transformer, a resistor that causes a voltage drop due to the on-state current of the transistor, and a charging voltage of the capacitor and a voltage drop due to the resistor are superimposed. an output stabilizing circuit configured to include a circuit for comparing the output of the transistor with a reference value, and a switching element to which the comparison output of the circuit is input and controlling the switching operation of the transistor; A switching power supply characterized by having an overcurrent protection circuit that turns off the transistor upon detecting an excessive current.

(2) The overcurrent protection circuit includes a detection resistor that causes a voltage drop due to the on-state current of the transistor, and a switching element that turns on when the voltage drop across the resistor exceeds a predetermined value. A switching power supply according to claim 1 of the utility model registration claim, characterized in that:

(3) The switching power supply according to claim 2, wherein the output stabilization circuit and the overcurrent protection circuit share the switching element and the resistor.