JPH01243733A - Signal transmitting circuit - Google Patents
Signal transmitting circuitInfo
- Publication number
- JPH01243733A JPH01243733A JP6981288A JP6981288A JPH01243733A JP H01243733 A JPH01243733 A JP H01243733A JP 6981288 A JP6981288 A JP 6981288A JP 6981288 A JP6981288 A JP 6981288A JP H01243733 A JPH01243733 A JP H01243733A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- driver
- transmission
- signal
- transmission line
- 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
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (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
この発明は、を線通信分野における信号伝送回路に関す
るものである。The present invention relates to a signal transmission circuit in the field of wire communications.
第５図は従来の信号伝送回路を示すブロック図であり、
図において、ｌａはドライバ、２はドライバｌａの電源
、１１はドライバ１ａ及び電源２を有する送信端末、６
はレシーバ、１２はレシーバ６を有する受信端末、７ａ
、７ｂは送信端末１１と受信端末１２との間を結ぶ伝送
路である。
次に動作について説明する。送信端末１１において、電
源２の給電によりドライバ１ａは送信号を行う。ドライ
バｌａより送信された伝送信号は、伝送路７ａ、７ｂを
媒体として受信端末１２に伝送され、該受信端末１２の
レシーバ６で受信される。FIG. 5 is a block diagram showing a conventional signal transmission circuit,
In the figure, la is a driver, 2 is a power source for the driver la, 11 is a transmitting terminal having a driver 1a and a power source 2, and 6
is a receiver, 12 is a receiving terminal having a receiver 6, 7a
, 7b is a transmission path connecting the transmitting terminal 11 and the receiving terminal 12. Next, the operation will be explained. At the transmitting terminal 11, the driver 1a sends a transmission signal by being supplied with power from the power source 2. The transmission signal transmitted from the driver la is transmitted to the receiving terminal 12 using the transmission lines 7a and 7b as a medium, and is received by the receiver 6 of the receiving terminal 12.
従来の信号伝送回路は以上のように構成されているので
、伝送路７ａ、７ｂが短絡障害を起こした場合、ドライ
バｌａの負荷電流が象、増し定格以上の状態となり、破
壊に結びつくなどの問題点があった。
この発明は上記のような課題を解消するためになされた
もので、伝送路における短絡障害の発生時にドライバを
保護できる信号伝送回路を得ることを目的とする。Since the conventional signal transmission circuit is configured as described above, if a short-circuit failure occurs in the transmission lines 7a and 7b, the load current of the driver 1a will increase to a state higher than the rated value, resulting in problems such as destruction. There was a point. The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a signal transmission circuit that can protect a driver when a short circuit fault occurs in a transmission line.
この発明に係る信号伝送回路は、伝送路の短絡障害を伝
送短絡検出回路で検出し、ドライバを破壊から保護する
ようにしたものである。The signal transmission circuit according to the present invention is configured to detect a short-circuit fault in a transmission line using a transmission short-circuit detection circuit and protect a driver from destruction.
この発明における伝送路短絡検出回路は、伝送路の短絡
障害を検出し、この検出信号によりドライバの保護を実
現する。The transmission line short circuit detection circuit according to the present invention detects short circuit faults in the transmission line, and protects the driver using this detection signal.
以上、この発明の一実施例を図について説明する。第１
図において、ｌａはドライバ、２は後述する送信端末１
１を動作させるための電源、３は電源２の電流変化を電
圧変化に変える抵抗、４は抵抗３の電圧変化で伝送路の
短絡を検出する伝送路短絡検出回路、５は伝送路短絡検
出回路４から出力されるドライバ保護信号で伝送路をし
ゃ断するリレー、１１はこれらドライバｌａ、電源２゜
抵抗３．伝送路短絡検出回路４．リレー５を備えた送信
端末、６はレシーバ、１２はレシーバ６を備えた受信端
末、７ａ、７ｂは送信端末１１と受信端末１２を結ぶ伝
送路である。
次に、第１図に示す実施例について動作を説明する。伝
送路７ａ、７ｂの短絡障害が起きていない場合、リレー
５はオン状態となっており、送信端末１１と受信端末１
２間は正常に伝送が行われる。
次に、伝送路７ａ、Ｖｂ間に短絡障害が発生すると、ト
ライバｌａに短絡電流が流れ電源電流がｅ、増する。こ
の急増した電源電流を抵抗３で電圧に変え、伝送路短絡
検出回路４へ導き、ドライバ保護信号を出力する。この
ドライバ保護信号でリレー５をオフ状態にし、ドライバ
ｌａの短絡電図を解除することによってドライバｌａを
破壊から保護する。
なお、上記実施例では、伝送路の短絡を電源電流の急増
で検出したが、第２図、第４図に示すように電源２が持
つ垂下特性を利用した電圧検出としてもよい。
また、上記実施例では、ドライバＩａの保護をリレー５
により実現したが、第３図、第４図に示すように、出カ
イネーブル端子付のドライバｌｂを制御することにより
実現してもよい。
上記各実施例を整理すると、第１図は電流検出リレー制
御形の信号伝送回路の例、第２図は電圧検出リレー制御
形の信号伝送回路の例、第３図は電流検出イネーブル端
子制御形の信号伝送回路の例、第４図は電圧検出イネー
ブル端子制御形の信号伝送回路の例を示したものである
。An embodiment of the present invention will be described above with reference to the drawings. 1st
In the figure, la is a driver, and 2 is a transmitting terminal 1, which will be described later.
1 is a power supply for operating the power supply 2, 3 is a resistor that converts the current change of the power supply 2 into a voltage change, 4 is a transmission line short circuit detection circuit that detects a short circuit in the transmission line by the voltage change of the resistor 3, and 5 is a transmission line short circuit detection circuit. 11 is a relay that cuts off the transmission line with a driver protection signal output from 4; 11 is a relay for these drivers la; Transmission line short circuit detection circuit 4. A transmitting terminal includes a relay 5, 6 is a receiver, 12 is a receiving terminal including the receiver 6, and 7a and 7b are transmission paths connecting the transmitting terminal 11 and the receiving terminal 12. Next, the operation of the embodiment shown in FIG. 1 will be explained. If no short-circuit failure occurs in the transmission lines 7a and 7b, the relay 5 is in the on state, and the transmitting terminal 11 and the receiving terminal 1
Transmission is performed normally between the two periods. Next, when a short circuit fault occurs between the transmission lines 7a and Vb, a short circuit current flows through the driver la and the power supply current increases by e. This rapidly increased power supply current is converted into a voltage by a resistor 3 and guided to a transmission path short circuit detection circuit 4, which outputs a driver protection signal. The driver la is protected from destruction by turning off the relay 5 with this driver protection signal and canceling the short-circuit electrical diagram of the driver la. In the above embodiment, a short circuit in the transmission path is detected by a sudden increase in the power supply current, but voltage detection may be performed using the drooping characteristic of the power supply 2 as shown in FIGS. 2 and 4. Further, in the above embodiment, the protection of the driver Ia is provided by the relay 5.
However, as shown in FIGS. 3 and 4, it may also be realized by controlling the driver lb with an output enable terminal. To summarize each of the above embodiments, Fig. 1 is an example of a current detection relay control type signal transmission circuit, Fig. 2 is an example of a voltage detection relay control type signal transmission circuit, and Fig. 3 is a current detection enable terminal control type signal transmission circuit. FIG. 4 shows an example of a voltage detection enable terminal controlled signal transmission circuit.
以上のように、この発明によれば伝送路短絡検出回路に
よって伝送路の短絡を検出してドライバを保護するよう
にしたので、伝送路の短絡によるドライバの破壊を防ぐ
効果がある。As described above, according to the present invention, the transmission line short circuit detecting circuit detects a short circuit in the transmission line and protects the driver, so there is an effect of preventing the driver from being destroyed due to a short circuit in the transmission line.
第１図はこの発明の一実施例による信号伝送回路を示す
ブロック図、第２図〜第４図はこの発明の他の実施例に
よる信号伝送回路を示すブロック図、第５図は従来の信
号伝送回路を示すブロック図である。
ｌａはドライバ、ｌｂは出力イネーブル端子付ドライバ
、２は電源、３は抵抗、４は伝送路短絡検出回路、５は
リレー、６はレシーバ、７ａ、７ｂは伝送路、１１は送
信端末、１２は受信端末。
なお、図中、同一符号は同一、または相当部分を示す。
特 許 出 願 人 三菱電機株式会社第２図
第３図
第４図
第６図FIG. 1 is a block diagram showing a signal transmission circuit according to an embodiment of the present invention, FIGS. 2 to 4 are block diagrams showing signal transmission circuits according to other embodiments of the invention, and FIG. 5 is a block diagram showing a signal transmission circuit according to another embodiment of the invention. FIG. 2 is a block diagram showing a transmission circuit. la is a driver, lb is a driver with an output enable terminal, 2 is a power supply, 3 is a resistor, 4 is a transmission line short circuit detection circuit, 5 is a relay, 6 is a receiver, 7a and 7b are transmission lines, 11 is a transmitting terminal, 12 is receiving terminal. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation Figure 2 Figure 3 Figure 4 Figure 6
Claims (1)
信端末に信号を送る信号伝送回路において、前記伝送路
の短絡を検出して前記ドライバの保護信号を出力する伝
送路短絡検出回路が設けられていることを特徴とする信
号伝送回路。In a signal transmission circuit that supplies power from a power source of a transmitting terminal to a driver and sends a signal to a receiving terminal via a transmission line, a transmission line short circuit detection circuit is provided that detects a short circuit in the transmission line and outputs a protection signal for the driver. A signal transmission circuit characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6981288A JPH01243733A (en) | 1988-03-25 | 1988-03-25 | Signal transmitting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6981288A JPH01243733A (en) | 1988-03-25 | 1988-03-25 | Signal transmitting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01243733A true JPH01243733A (en) | 1989-09-28 |
Family
ID=13413545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6981288A Pending JPH01243733A (en) | 1988-03-25 | 1988-03-25 | Signal transmitting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01243733A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4344238A1 (en) * | 1992-12-25 | 1994-06-30 | Mitsubishi Electric Corp | Two-line input / output device |
| CN111679222A (en) * | 2020-05-15 | 2020-09-18 | 深圳市崧盛电子股份有限公司 | Detection circuit for short circuit between metal packaging tube and metal radiating fin and short circuit detection device |
-
1988
- 1988-03-25 JP JP6981288A patent/JPH01243733A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4344238A1 (en) * | 1992-12-25 | 1994-06-30 | Mitsubishi Electric Corp | Two-line input / output device |
| CN111679222A (en) * | 2020-05-15 | 2020-09-18 | 深圳市崧盛电子股份有限公司 | Detection circuit for short circuit between metal packaging tube and metal radiating fin and short circuit detection device |
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