JPS60141687U

JPS60141687U - switching power supply

Info

Publication number: JPS60141687U
Application number: JP12791783U
Authority: JP
Inventors: 克彦清水
Original assignee: ティーディーケイ株式会社
Priority date: 1983-08-19
Filing date: 1983-08-19
Publication date: 1985-09-19

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図は従来のスイッチング電源の電気回路接続図、第
２図は同じくその過電流制御特性、第３図は本考案に係
るスイッチング電源の電気回路接続図、第４図は同じく
各部の電圧波形図、第５図は本考案に係るスイッチング
電源の過電流制御特性を従来のものと比較して示す図、
第６図は本考案に係るスイッチング電源の別の実施例に
おける電気回路接続図、第７図は同じくその各部の電圧
　　　−波形図、第８図は同じくその過電流制御特性を
、　　　。従来のものと比較して示す図である。１・・・・・・変圧器、２・・・・・・スイッチング素
子、４・・・　　　　゛・・・カレントトランス、６・
・・・・・制御回路、８・・・・・・イ　　　　　゛ン
ピーダンス可変回路、８１・・・・・・抵抗、８２・・
・・・・ツェナーダイオード、１８・・・・・・波形整
形回路、１−０・・・・・・ツェナーダイオード、１８
１・・・・・・コンチン　　　　　゛す、１８２・・・
・・・抵抗。、−７−１］−１−−−艷−−−ヅレ ■−一　　１１、Ｌｌコ１１μｍFig. 1 is an electric circuit connection diagram of a conventional switching power supply, Fig. 2 is the same overcurrent control characteristic, Fig. 3 is an electric circuit connection diagram of a switching power supply according to the present invention, and Fig. 4 is the voltage waveform of each part. 5 is a diagram showing the overcurrent control characteristics of the switching power supply according to the present invention in comparison with the conventional one,
FIG. 6 is an electric circuit connection diagram of another embodiment of the switching power supply according to the present invention, FIG. 7 is a voltage-waveform diagram of each part thereof, and FIG. 8 is the overcurrent control characteristic thereof. It is a figure shown in comparison with a conventional one. 1...Transformer, 2...Switching element, 4...゛...Current transformer, 6...
... Control circuit, 8 ... Variable impedance circuit, 81 ... Resistor, 82 ...
... Zener diode, 18 ... Waveform shaping circuit, 1-0 ... Zener diode, 18
１・・・・・・Continued, 182...
···resistance. , -7-1]-1----艷---Dare■-1 11, Ll 11μm

Claims

[Scope of utility model registration request]

(1) A switching element connected in series to the winding of the transformer switches the DC input applied through the winding of the transformer, takes out the switching output to the other winding of the transformer, and rectifies it. A switching power supply that smoothes and obtains a DC output, and is a current transformer that is inserted into the circuit loop so that a current flowing through the circuit loop including the winding of the transformer and the switching element or a current proportional to the current flows within the circuit loop. In the switching power supply, the switching power supply includes a control circuit that detects the current transformer as a voltage signal and controls the operation of the switching element using the detected voltage signal of the current transformer as an input signal, the control circuit being connected to the output side of the current transformer from the current transformer side. A switching power supply characterized by having a variable impedance circuit whose impedance when viewed from the side changes according to a voltage value.

(2) A utility model according to claim 1, characterized in that the circuit is configured to rectify and smooth the flyback voltage generated in the transformer during the off-period of the switching element to obtain a direct output. switching power supply.

(3) The variable impedance circuit is configured by connecting a series circuit of a Zener diode and a resistor in parallel to the output side of the current transformer. Switching power supplies as described in section.

(4) Utility model registration claim 1, characterized in that a waveform shaping circuit is provided downstream of the variable impedance circuit to change the slope of the voltage waveform and input it to the control circuit.
Switching W according to item 2 or 3.