JPS5958844U - System switching circuit - Google Patents
System switching circuitInfo
- Publication number
- JPS5958844U JPS5958844U JP1982155590U JP15559082U JPS5958844U JP S5958844 U JPS5958844 U JP S5958844U JP 1982155590 U JP1982155590 U JP 1982155590U JP 15559082 U JP15559082 U JP 15559082U JP S5958844 U JPS5958844 U JP S5958844U
- Authority
- JP
- Japan
- Prior art keywords
- input terminal
- nand circuit
- power supply
- resistor
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Television Receiver Circuits (AREA)
- Electronic Switches (AREA)
- Power Sources (AREA)
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
第１図は従来のリセット回路を示す回路図、第２図ａ、
ｂ、 ｃは、第１図の回路の動作信号波形図、第
３図はこの考案の一実施例を示す回路図、第４図ａ ”
−ｅは第３図の回路の動作信号波形図である。
２１・・・電源入力端子、２２・・・ナンド回路、２４
・・・ダイオード、２５，２８’、２９，３１．Ｒｏ”
”抵抗、２６ 、Ｃｏ・・・コンデンサ、２７，３０・
・・トランジスタ、Ａ・・・電源の瞬時断検出手段。Figure 1 is a circuit diagram showing a conventional reset circuit, Figure 2a,
b, c are operating signal waveform diagrams of the circuit in Fig. 1, Fig. 3 is a circuit diagram showing an embodiment of this invention, and Fig. 4 a.
-e is an operating signal waveform diagram of the circuit of FIG. 3. 21...Power input terminal, 22...NAND circuit, 24
...Diode, 25, 28', 29, 31. “Ro”
"Resistor, 26, Co... Capacitor, 27, 30.
...Transistor, A...Means for detecting instantaneous interruption of power supply.
Claims (2)
力端子が接続されたナンド回路と、このナンド回路の第
２入力端と前記システム電源の入力端子間に接続され、
前記システム電源によって充電されるコンデンサを有し
、前記システム電源の電位が瞬間的な断により所定電位
よりも降下したときに前記コンデンサを電源として機能
し、前記第２入力端に負のパ／レスを印加して前記ナン
ド回路の出力端に切換パルスを発生させる電源の瞬時断
検出手段とを具備したことを特徴とするシステム切換回
路。(1) a NAND circuit whose first input terminal is connected to the input terminal of the system power supply via an integrating circuit; and a NAND circuit connected between the second input terminal of the NAND circuit and the input terminal of the system power supply,
It has a capacitor that is charged by the system power supply, the capacitor functions as a power supply when the potential of the system power supply drops below a predetermined potential due to a momentary disconnection, and the second input terminal is connected to a negative resistor. and a means for detecting an instantaneous power interruption for generating a switching pulse at the output end of the NAND circuit by applying a switching pulse to the output terminal of the NAND circuit.
源入力端にアノードが接続されコレクタが、第１の抵抗
及び前記コンデンサを介して接地されたダイオードと、
前記ダイオードのカソードがエミッタに接続され、ベー
スに第２の抵抗を介して前記電源入力端が接続され、コ
レクタが第３の抵抗を介して接地された第１のトランジ
スタと、この第１のトランジスタのコレクタにベースが
接続され、エミッタが接地きれ、コレ ′フタが
第４の抵抗を介して前記電源入力端に接゛続されるとと
もに前記ナンド回路の第２入力端に接続された第２のト
ランジスタとを具備したことを特徴とする実用新案登録
請求の範囲第１項記載のシステム切換回路。(2) The instantaneous power interruption detection means includes a diode whose anode is connected to the power input terminal of the system and whose collector is grounded via the first resistor and the capacitor;
a first transistor in which the cathode of the diode is connected to the emitter, the power input terminal is connected to the base through a second resistor, and the collector is grounded through a third resistor; The base is connected to the collector of the NAND circuit, the emitter is grounded, the base is connected to the power supply input terminal via the fourth resistor, and the second cap is connected to the second input terminal of the NAND circuit. A system switching circuit according to claim 1, characterized in that the system switching circuit comprises a transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982155590U JPS5958844U (en) | 1982-10-14 | 1982-10-14 | System switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982155590U JPS5958844U (en) | 1982-10-14 | 1982-10-14 | System switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5958844U true JPS5958844U (en) | 1984-04-17 |
Family
ID=30343589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1982155590U Pending JPS5958844U (en) | 1982-10-14 | 1982-10-14 | System switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5958844U (en) |
-
1982
- 1982-10-14 JP JP1982155590U patent/JPS5958844U/en active Pending
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