JPH0456527A - Signal switching circuit - Google Patents
Signal switching circuitInfo
- Publication number
- JPH0456527A JPH0456527A JP16706090A JP16706090A JPH0456527A JP H0456527 A JPH0456527 A JP H0456527A JP 16706090 A JP16706090 A JP 16706090A JP 16706090 A JP16706090 A JP 16706090A JP H0456527 A JPH0456527 A JP H0456527A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- switching
- control
- interruption
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000007257 malfunction Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は信号切替回路に関し、特に冗長系のある信号伝
送回路の切替え制御の信頼性を向上した信号切替回路に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal switching circuit, and more particularly to a signal switching circuit that improves the reliability of switching control of a signal transmission circuit with a redundant system.
従来の信号切替回路は、第２図に示すように、入力信号
Ａ、Ｂの有無をそれぞれ検出する信号断検出回路１０３
，１０４、この信号Ａ、又はＢ断情報を入力して正常信
号を選択する制御信号１５Ａを出力する制御系回路１０
２、この制御信号１５Ａにより正常信号の方を選択して
切替える切替器１０１から構成されていた。As shown in FIG. 2, the conventional signal switching circuit includes a signal disconnection detection circuit 103 that detects the presence or absence of input signals A and B, respectively.
, 104, a control system circuit 10 that inputs this signal A or B disconnection information and outputs a control signal 15A that selects a normal signal.
2. It consisted of a switch 101 that selects and switches to the normal signal based on this control signal 15A.
上述した従来の信号切替回路は、各入力信号の断検出を
信号断検出回路１０３，１０４にて行い各入力信号の信
号断情報を制御系回路が受は取り切替器に送出する場合
に、制御系回路の回路故障により信号切替制御信号が誤
動作した場合に、正常な系が有るにもかかわらず入力信
号断の系を選択するという欠点がある。In the conventional signal switching circuit described above, when the signal interruption detection circuits 103 and 104 detect the interruption of each input signal, and the control system circuit receives and sends the signal interruption information of each input signal to the switching device, There is a drawback that when the signal switching control signal malfunctions due to a circuit failure in the system circuit, the system in which the input signal is disconnected is selected even though there is a normal system.
本発明の信号切替回路は、少なくとも２系統の冗長伝送
系のある入力信号の断を検出する検出回路と、切替器と
を有する信号切替回路において、複数冗長系の信号断の
検出回路の情報をもとに制御系回路が生成する信号切替
判定信号が正常な信号入力がある系を選択している場合
には、その切替判定信号で切替器を動作させ、一方、前
記制御系回路が信号断の系を選択した場合にはその切替
判定信号を無効とし正常な系を選択する別の制御信号変
換回路を有する。The signal switching circuit of the present invention includes a detection circuit for detecting a disconnection of an input signal in at least two redundant transmission systems, and a switch, in which information of the signal disconnection detection circuit of a plurality of redundant transmission systems is transmitted. If the signal switching judgment signal originally generated by the control system circuit selects a system with a normal signal input, the switching judgment signal operates the switch; If the system is selected, the system has another control signal conversion circuit that invalidates the switching determination signal and selects a normal system.
次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例のブロック図である。第１図
において、信号断検出回路１０３および１０４はそれぞ
れ入力信号Ａおよび入力信号Ｂの断を検出して信号Ａ断
情報１３および信号Ｂ断情報１４を出力する。制御系回
路１０２はこの各信号の断情報を受けて、いずれかの信
号Ａ又は信号Ｂ断情報を受けて信号切替判定信号１５を
出力する。一方、制御信号変換回路１０５にも信号Ａ又
は信号Ｂ断情報を入力して監視を行い、制御系回路の判
定信号と合致すれば制御信号１５Ａを送出している。今
、制御系回路１０２が誤って信号断の系を選択している
場合には、信号切替判定信号１５を無効とし、正常な信
号入力がある系を選択するように新たに切替の制御信号
１５Ａを生成し、切替器１０１に送出する。すなわち、
制御信号変換回路１０５は制御系回路１０２の監視をも
行って、異常動作の場合に現時点の制御信号１５Ａの動
作を停止して、正常動作に変換する。FIG. 1 is a block diagram of one embodiment of the present invention. In FIG. 1, signal disconnection detection circuits 103 and 104 detect disconnection of input signal A and input signal B, respectively, and output signal A disconnection information 13 and signal B disconnection information 14. The control system circuit 102 receives the disconnection information of each signal and outputs the signal switching determination signal 15 upon receiving the disconnection information of either the signal A or the signal B. On the other hand, the signal A or signal B disconnection information is also input to the control signal conversion circuit 105 for monitoring, and if it matches the determination signal of the control system circuit, the control signal 15A is sent out. If the control system circuit 102 has mistakenly selected the system with the signal cut off, the signal switching determination signal 15 is invalidated and a new switching control signal 15A is sent to select the system with the normal signal input. is generated and sent to the switch 101. That is,
The control signal conversion circuit 105 also monitors the control system circuit 102, and in the case of abnormal operation, stops the current operation of the control signal 15A and converts it to normal operation.
以上説明したように本発明は、各入力信号の信号断情報
をもとに、制御系回路が生成した信号切替制御信号を入
力信号が断となった系のみ選択できないように二重監視
することにより、制御系回路の回路故障により、信号切
替制御信号誤動作が生じた場合でも正常な信号切替が行
なうことができる効果がある。As explained above, the present invention double monitors the signal switching control signal generated by the control system circuit based on the signal disconnection information of each input signal so that only the system where the input signal is disconnected cannot be selected. Therefore, even if a malfunction of the signal switching control signal occurs due to a circuit failure in the control system circuit, normal signal switching can be performed.
第１図は本発明の一実施例を示すブロック図、第２図は
従来例を示すブロック図である。
Ａ、Ｂ・・・入力信号、Ｃ・・・出力信号、１３・・・
信号Ａ断情報、１４・・・信号Ｂ断情報、１５・・・信
号切替判定信号、１５Ａ・・・制御信号、１０１・・・
切替器、１０２・・・制御系回路、１０３．１０４・・
・信号断検出回路、１０５・・・制御信号変換回路。FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example. A, B...input signal, C...output signal, 13...
Signal A disconnection information, 14... Signal B disconnection information, 15... Signal switching determination signal, 15A... Control signal, 101...
Switching device, 102... Control system circuit, 103.104...
- Signal disconnection detection circuit, 105... control signal conversion circuit.
Claims (1)
出する検出回路と、切替器とを有する信号切替回路にお
いて、複数冗長系の信号断の検出回路の情報をもとに制
御系回路が生成する信号切替判定信号が正常な信号入力
がある系を選択している場合には、その切替判定信号で
切替器を動作させ、一方、前記制御系回路が信号断の系
を選択した場合にはその切替判定信号を無効とし正常な
系を選択する別の制御信号変換回路を有することを特徴
とする信号切替回路。In a signal switching circuit having at least two redundant transmission systems, a detection circuit that detects a disconnection of an input signal, and a switch, a control system circuit is generated based on information from the signal disconnection detection circuit of multiple redundant transmission systems. If the signal switching judgment signal to be output selects a system with a normal signal input, the switching judgment signal operates the switch; on the other hand, if the control system circuit selects a system with a signal disconnection, the switching judgment signal operates the switch. A signal switching circuit comprising another control signal conversion circuit that invalidates the switching determination signal and selects a normal system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16706090A JPH0456527A (en) | 1990-06-26 | 1990-06-26 | Signal switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16706090A JPH0456527A (en) | 1990-06-26 | 1990-06-26 | Signal switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0456527A true JPH0456527A (en) | 1992-02-24 |
Family
ID=15842658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16706090A Pending JPH0456527A (en) | 1990-06-26 | 1990-06-26 | Signal switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0456527A (en) |
-
1990
- 1990-06-26 JP JP16706090A patent/JPH0456527A/en active Pending
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