JPS59178730U - reset circuit - Google Patents

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

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来のリセット回路の一例の回路図、第２図Ａ
−Ｃは第１図示の回路各部の波形図、第３図は本考案に
なるリセット回路の一実施例の回路図、第４図Ａ−Ｃは
第３図示の回路各部の波形図である。 １・・・電源端子、２・・・制御回路、Ｃ１，Ｃ２・・
・コンデンサ、Ｄ□・・・ツェナーダイオード、Ｄ２・
・・ダイオード、Ｑ２＋　Ｑ２・・・トランジスタ、Ｒ
工〜Ｒ４・・・抵抗。Figure 1 is a circuit diagram of an example of a conventional reset circuit, Figure 2A
-C is a waveform diagram of each part of the circuit shown in FIG. 1, FIG. 3 is a circuit diagram of an embodiment of the reset circuit according to the present invention, and FIGS. 4A to 4C are waveform diagrams of various parts of the circuit shown in FIG. 1...Power terminal, 2...Control circuit, C1, C2...
・Capacitor, D□... Zener diode, D2・
...Diode, Q2+ Q2...Transistor, R
Engineering~R4...Resistance.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 電源端子より供給される電源を定電圧回路で安定化し、
該定電圧回路の出力電圧をコンデンサと抵抗とて構成さ
れる微分回路に供給し、該電源の投入時に該微分回路で
生成されるパルスを用いて制御回路のリセットを行なう
リセット回路において、該電源遮断時に生ずる該電源端
子と該定電圧回路の出力端子との間の電位差によって導
通し該コンデンサの両端を短絡するトランジスタを設け
てなるリセット回路。The power supplied from the power terminal is stabilized by a constant voltage circuit,
In a reset circuit that supplies the output voltage of the constant voltage circuit to a differentiator circuit composed of a capacitor and a resistor, and resets a control circuit using a pulse generated by the differentiator circuit when the power source is turned on, the power source A reset circuit provided with a transistor that conducts and shorts both ends of the capacitor due to a potential difference between the power supply terminal and the output terminal of the constant voltage circuit that occurs when the power supply is cut off.