JPS62176325A - Electronic switch circuit - Google Patents

Electronic switch circuit

Info

Publication number
JPS62176325A
JPS62176325A JP1929386A JP1929386A JPS62176325A JP S62176325 A JPS62176325 A JP S62176325A JP 1929386 A JP1929386 A JP 1929386A JP 1929386 A JP1929386 A JP 1929386A JP S62176325 A JPS62176325 A JP S62176325A
Authority
JP
Japan
Prior art keywords
switch
signal
circuit
input
level
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
Application number
JP1929386A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Tamura
田村 慶幸
Norio Terada
典生 寺田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC IC Microcomputer Systems Co Ltd
Original Assignee
NEC IC Microcomputer Systems Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC IC Microcomputer Systems Co Ltd filed Critical NEC IC Microcomputer Systems Co Ltd
Priority to JP1929386A priority Critical patent/JPS62176325A/en
Publication of JPS62176325A publication Critical patent/JPS62176325A/en
Pending legal-status Critical Current

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  • Electronic Switches (AREA)

Abstract

PURPOSE:To turn on/off forcibly a switch when no reference level detection circuit is operated even after a prescribed time is elapsed by providing a timer circuit switching a switch circuit forcibly at a prescribed time depending on a switching control signal. CONSTITUTION:When a DC input is inputted to an input terminal A, the level of the input signal does not cross a reference voltage level and when a low frequency AC input signal is inputted to the input terminal A, since the period where a reference level detection circuit 2 changes is long, the reference level detection circuit 2 might not send a clock to a T/FFs 7, 8 or a lock frequency of the T/FFs 7, 8 might be low. In such a case, a time constant comprising a resistor 13 and a capacitor 14 is supplied to a change in the signal level at a control terminal D of the switch, and when the potential across the resistor 13 is lost, since the output of an exclusive NOR circuit 15 gives an H level, a D/FF 12 is driven to switch a signal changeover switch 1.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、電子スイッチ回路、特に信号切換あるいはD
C電圧切換時の開閉に使用する電子スイッチ回路に関す
る。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to electronic switch circuits, particularly signal switching or
This invention relates to an electronic switch circuit used for opening and closing when switching C voltage.

〔従来の技術〕[Conventional technology]

一般的に信号切換のスイッチ回路は、スイッチの開閉に
際してスイッチ開閉時のノイズ(グリッチノイズ)を低
減する目的であらかじめ設定した基準電圧レベルに同期
してスイッチの開閉をコントロールすることが行なわれ
ている。
In general, signal switching circuits control the opening and closing of switches in synchronization with a preset reference voltage level in order to reduce noise (glitch noise) when the switch opens and closes. .

第3図に従来の電子スイッチ回路の一例を示す。FIG. 3 shows an example of a conventional electronic switch circuit.

第3図に示す例は、入力端千人と出力端子Bを備えたス
イッチ16と、スイッチ16の入力端子    ・Aに
印加される入力信号と、端子Cで設定される基準電圧レ
ベルとを比較し、入力端千人に印加される入力信号のレ
ベルが基準電圧レベルと同値となるタイミングを検出す
る基準レベル検出回路17と、端子りにスイッチコント
ロール信号が入力された後、基準レベル検出回路17の
出力信号に同期しスイッチ16を開閉するコントロール
回路18とによ多構成されていた。
The example shown in FIG. 3 is a switch 16 with an input terminal and an output terminal B, and the input signal applied to the input terminal A of the switch 16 is compared with the reference voltage level set at the terminal C. The reference level detection circuit 17 detects the timing when the level of the input signal applied to the input terminal becomes the same value as the reference voltage level, and the reference level detection circuit 17 detects the timing when the level of the input signal applied to the input terminal becomes the same value as the reference voltage level. The control circuit 18 opens and closes the switch 16 in synchronization with the output signal of the switch 16.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

このような従来の電子スイッチ回路においては、開閉す
べき入力信号の周波数が低い場合や、 DC信号である
場合スイッチのコントロール信号が入力されても基準レ
ベル検出回路17の検出信号が出力されないことがあシ
、スイッチの応答スピードが遅いとか、スイッチが開閉
しないという欠点があった。
In such conventional electronic switch circuits, if the frequency of the input signal to be opened/closed is low or if it is a DC signal, the detection signal of the reference level detection circuit 17 may not be output even if the switch control signal is input. However, there were drawbacks such as the switch's response speed being slow and the switch not opening or closing.

本発明は、このような問題を解決した電子スイッチ回路
を提供することを目的とする。
An object of the present invention is to provide an electronic switch circuit that solves these problems.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、スイッチ回路、基準レベル検出回路。 The present invention relates to a switch circuit and a reference level detection circuit.

コントロール回路とタイマー回路によシ構成される。ス
イッチの入力に低周波の信号または、 DC信号が入力
された場合ある一定時間経りても基準レベル検出回路が
動作しない場合は、コントロール回路の入力信号により
、タイマー回路が動作し、タイマー回路出力信号により
スイッチを強制的に開閉することが可能になる。
It consists of a control circuit and a timer circuit. If a low frequency signal or a DC signal is input to the input of the switch, and the reference level detection circuit does not operate after a certain period of time, the timer circuit operates according to the input signal of the control circuit, and the timer circuit outputs. The signal allows the switch to be forced open or closed.

〔実施例〕 次に1本発明について図面を参照して説明する。〔Example〕 Next, one embodiment of the present invention will be explained with reference to the drawings.

第1図は、本発明の1実施例のブロック図である。この
電子スイッチ回路は、スイッチ1と、入力端子Aの入力
信号と端子Cの基準電圧レベルとを比較し、同値となる
タイミングを検出する基準レベル検出回路2と、該検出
回路2の出力信号と端子りのコントロール信号と同期を
とるコントロール回路3と、コントロール信号によシ一
定時間後、コントロール回路3にスイッチ開閉信号を出
力するタイマー回路4全備える。
FIG. 1 is a block diagram of one embodiment of the present invention. This electronic switch circuit includes a switch 1, a reference level detection circuit 2 that compares an input signal at an input terminal A with a reference voltage level at a terminal C, and detects the timing at which the input signal at an input terminal A and a reference voltage level at a terminal C become the same, and an output signal from the detection circuit 2. The device includes a control circuit 3 that synchronizes with a control signal from a terminal, and a timer circuit 4 that outputs a switch opening/closing signal to the control circuit 3 after a certain period of time according to the control signal.

第2図に、第1図の電子スイッチ回路のさらに詳細な回
路図を示す。基準レベル検出回路2にコンパレータを用
い、コントロール回% 3 FC’r・7りてラフ0ツ
ブ(以下T / ]!’ Fと記す)7,8と。
FIG. 2 shows a more detailed circuit diagram of the electronic switch circuit of FIG. A comparator is used in the reference level detection circuit 2, and the control times % 3 FC'r.7 are rough 0 (hereinafter referred to as T/]!'F) 7 and 8.

インバータ9と、排他的OR回路lOと、O几回路11
と、D・フリッグ70ツブ(以下D/FFと記す)12
を用いた。また、タイマー回路4には抵抗13と容量1
4と、排他的NoOR回路5を用いた。
Inverter 9, exclusive OR circuit 1O, and OR circuit 11
and D. Frigg 70 tubes (hereinafter referred to as D/FF) 12
was used. Also, the timer circuit 4 includes a resistor 13 and a capacitor 1.
4 and an exclusive NoOR circuit 5 were used.

入力端子Aよシ交流の入力信号が入力されると、入力端
子Aの信号レベルと端子Cの基準電圧レベルとを基準レ
ベル検出回路2で比較し、入力端子Aの入力信号のレベ
ルが基準電圧レベルをクロスするとT/FF7、または
T/FFgが動作し、T/FF7またはT/FFgの出
力が変化するため、排他的OR回路10が出力Hレベル
を出力し、排他的OR回路10の出力によl)/FF1
2が端子りのコントロール信号の値を読み込み、D/F
F12のQ端子に出力し、信号の切換スイッチ5を開閉
する。
When an AC input signal is input from input terminal A, the signal level of input terminal A and the reference voltage level of terminal C are compared in the reference level detection circuit 2, and the level of the input signal of input terminal A is determined as the reference voltage. When the levels are crossed, T/FF7 or T/FFg operates and the output of T/FF7 or T/FFg changes, so the exclusive OR circuit 10 outputs an H level output, and the output of the exclusive OR circuit 10 Yol)/FF1
2 reads the value of the control signal of the terminal, and the D/F
The signal is output to the Q terminal of F12, and the signal changeover switch 5 is opened and closed.

入力端子AにDCの入力が入力されると、この入力信号
のレベルが基準電圧レベルをクロスせず、また、低周波
交流の入力信号が入力端千人に入力されると、基準レベ
ル検出回路2の変化する周期が長い為、基準レベル検出
回路2が’J”/FF7゜T / F F Bヘクロッ
クを送れないとか、T/FF’7、’11’/FFsの
クロックの周波数が低い場合がある。この様な場合、ス
イッチのコントロール端子りの信号レベルの変化を抵抗
13と、容#、14によシある時定数を持たせることに
ょシ、その抵抗13の両端の電位差がなくなりた時に排
他的NOR回路15の出力がHレベルを出力するため、
D/FF12が駆動し、信号切換スイッチ5を開閉する
When a DC input is input to input terminal A, the level of this input signal does not cross the reference voltage level, and when a low frequency AC input signal is input to input terminal A, the reference level detection circuit If the reference level detection circuit 2 cannot send the clock to 'J'/FF7゜T/FFB because the changing period of 2 is long, or if the frequency of the clock of T/FF'7, '11'/FFs is low. In such a case, it is necessary to make the change in the signal level at the control terminal of the switch have a certain time constant in the resistor 13 and the capacitors #14, so that the potential difference between both ends of the resistor 13 disappears. Since the output of exclusive NOR circuit 15 outputs H level at times,
The D/FF 12 is driven to open and close the signal changeover switch 5.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明は、電子スイッチにタイマ
ー回路を具備することによシ、交流信号に対しては、基
準レベルとのクロスポイントと同期し、信号切換スイッ
チを開閉する為、スイッチのグリッチノイズを低減する
。また、開閉すべき信号の周波数が低い場合やDC信号
である場合、スイッチのコントロール信号によシ一定時
間経過後強制的に信号切換スイッチを開閉できるという
効果がある。
As explained above, the present invention provides an electronic switch with a timer circuit, so that the switch opens and closes in synchronization with the cross point with the reference level for AC signals. Reduce glitch noise. Furthermore, when the frequency of the signal to be opened/closed is low or it is a DC signal, there is an effect that the signal changeover switch can be forcibly opened/closed after a certain period of time according to the control signal of the switch.

【図面の簡単な説明】 第1図は本発明の一実施例のブロック図、第2図は第1
図の電子スイッチ回路を詳細に示すブロック図、第3図
は従来例のブロック図である。 1・・・・・・信号切換スイッチ、2・・四基準レベル
検出回路、3・・・・・・コントロール回路、4・・・
・・・タイマー回路、A・・・・・・入力端子、B・・
・・・・出力端子、C・・・・・・基準レベル入力端子
、D・・・・・・コントロール信号端子。 代理人 弁理士  内 原   2・ 日・ 、 学I 図 !−・a号4万斗史スイッケ    A90.入n恕箔
壬4−0.り?マー回前’p       o−・・コ
シ1v−1しも号帽r子牛2 回
[Brief Description of the Drawings] Fig. 1 is a block diagram of one embodiment of the present invention, and Fig. 2 is a block diagram of an embodiment of the present invention.
FIG. 3 is a block diagram showing details of the electronic switch circuit shown in FIG. 3, and FIG. 3 is a block diagram of a conventional example. 1... Signal selection switch, 2... Four reference level detection circuits, 3... Control circuit, 4...
...Timer circuit, A...Input terminal, B...
...Output terminal, C...Reference level input terminal, D...Control signal terminal. Agent Patent Attorney Uchihara 2, Japanese, Academic I Figure! -・A No. 4 Mantoji Suikke A90. Enter n Kyou Hakumi 4-0. the law of nature? Mar times ago'p o-... Koshi 1v-1 Shimogo hat r calf 2 times

Claims (1)

【特許請求の範囲】[Claims] 信号の通電、しゃ断を行なうトランジスタで構成したス
イッチ回路と、該信号と基準電圧レベルを比較し、該信
号が基準電圧レベルと同値となるタイミングを検出する
基準レベル検出回路と、スイッチ回路の開閉コントロー
ル信号と基準レベル検出回路出力信号との同期をとり、
スイッチを開閉するスイッチコントロール回路を有する
電子スイッチ回路において、開閉コントロール信号によ
り一定時間に強制的にスイッチ回路を開閉させるタイマ
ー回路を前記スイッチコントロール回路が有することを
特徴とする電子スイッチ回路。
A switch circuit made up of transistors that turns on and off the signal, a reference level detection circuit that compares the signal with a reference voltage level and detects when the signal becomes the same value as the reference voltage level, and a switch circuit opening/closing control. Synchronize the signal with the reference level detection circuit output signal,
1. An electronic switch circuit having a switch control circuit for opening and closing a switch, characterized in that the switch control circuit has a timer circuit for forcibly opening and closing the switch circuit at a fixed time using an opening/closing control signal.
JP1929386A 1986-01-30 1986-01-30 Electronic switch circuit Pending JPS62176325A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1929386A JPS62176325A (en) 1986-01-30 1986-01-30 Electronic switch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1929386A JPS62176325A (en) 1986-01-30 1986-01-30 Electronic switch circuit

Publications (1)

Publication Number Publication Date
JPS62176325A true JPS62176325A (en) 1987-08-03

Family

ID=11995380

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1929386A Pending JPS62176325A (en) 1986-01-30 1986-01-30 Electronic switch circuit

Country Status (1)

Country Link
JP (1) JPS62176325A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110726931A (en) * 2019-11-01 2020-01-24 北京小米移动软件有限公司 On-off detection circuit of flash switch and electronic equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5728409A (en) * 1980-07-28 1982-02-16 Sony Corp Muting circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5728409A (en) * 1980-07-28 1982-02-16 Sony Corp Muting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110726931A (en) * 2019-11-01 2020-01-24 北京小米移动软件有限公司 On-off detection circuit of flash switch and electronic equipment

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