JPS60119837U

JPS60119837U - power circuit

Info

Publication number: JPS60119837U
Application number: JP603984U
Authority: JP
Inventors: 裕司加藤
Original assignee: シャープ株式会社
Priority date: 1984-01-19
Filing date: 1984-01-19
Publication date: 1985-08-13

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 drawings]

第１図〜第３図はそれぞれ電源回路を示す回路図で、第
１図と第２図はそれぞれ従来例の、第３図は本実施例の
回路図である。Ｃ・・・電源回路、３・・・整流回路、４ｂ・・・第２
リツプルフイルタ、Ｔｒ・・・トランジスタ、Ｒ・・・
抵抗、Ｃ２・・・第２コンデンサ、７・・・定電圧回路
。1 to 3 are circuit diagrams showing power supply circuits, respectively. FIGS. 1 and 2 are the circuit diagrams of the conventional example, and FIG. 3 is the circuit diagram of the present embodiment. C...power supply circuit, 3...rectifier circuit, 4b...second
Ripple filter, Tr...transistor, R...
Resistor, C2...second capacitor, 7...constant voltage circuit.

Claims

[Scope of utility model registration request]

It has a rectifier circuit that rectifies AC input and converts it into DC, and as a ripple removal filter for this DC, a resistor and a capacitor are commonly connected to its base, and its collector is connected to the DC output terminal of the rectifier circuit. A transistor is provided, the base of which is connected to the DC output terminal via the resistor and to the ground side via a capacitor, and the ripple is bypassed to the ground side by the capacitor, and then the transistor is connected to the DC output terminal via the resistor. The collector current of this transistor, which is controlled by the base current supplied to the base of the transistor, outputs the DC from which the ripple has been removed from its emitter and supplies it to the load. A constant voltage circuit is provided to limit the voltage to a certain value or less, and this constant voltage circuit is connected between the collector of the transistor and the emitter, so that when a large current passes through the collector current of the transistor, this passing voltage is A power supply circuit characterized in that the large current is bypassed by the constant voltage circuit due to a voltage drop between the collector and emitter of the transistor.