JPH0386489U - - Google Patents

Info

Publication number
JPH0386489U
JPH0386489U JP14902289U JP14902289U JPH0386489U JP H0386489 U JPH0386489 U JP H0386489U JP 14902289 U JP14902289 U JP 14902289U JP 14902289 U JP14902289 U JP 14902289U JP H0386489 U JPH0386489 U JP H0386489U
Authority
JP
Japan
Prior art keywords
wire
constant current
transmitter
signal
operational amplifier
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.)
Granted
Application number
JP14902289U
Other languages
Japanese (ja)
Other versions
JPH0710474Y2 (en
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 filed Critical
Priority to JP14902289U priority Critical patent/JPH0710474Y2/en
Publication of JPH0386489U publication Critical patent/JPH0386489U/ja
Application granted granted Critical
Publication of JPH0710474Y2 publication Critical patent/JPH0710474Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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  • Arrangements For Transmission Of Measured Signals (AREA)

Description

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

第１図は本考案の１実施例の構成を示す回路図
、第２図は従来の２線式伝送器の構成を示すブロ
ツク図、第３図は第２図に示す２線式伝送器の出
力端側の内部構成を示す回路図である。 １０……２線式伝送器、１１……電源、１２…
…受信器、Ｑ１……出力トランジスタ、Ｑ４……
制御増幅器、Ｑ５……演算増幅器、ＣＣ……定電
流回路。 Figure 1 is a circuit diagram showing the configuration of one embodiment of the present invention, Figure 2 is a block diagram showing the configuration of a conventional two-wire transmitter, and Figure 3 is a block diagram of the two-wire transmitter shown in Figure 2. FIG. 3 is a circuit diagram showing the internal configuration on the output end side. 10...2-wire transmitter, 11...power supply, 12...
...Receiver, Q 1 ... Output transistor, Q 4 ...
Control amplifier, Q5 ...Operation amplifier, CC...constant current circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 負荷側から２線の伝送線を介して電源の供給を
受け測定すべき物理量を電気信号に変換してこれ
を信号処理して前記伝送線を介して前記負荷に電
流信号として伝送する２線式伝送器において、前
記電流信号の一部を前記２線式伝送器の出力端の
一方から定電流として取り込む定電流手段と、こ
の定電流の一部を前記出力端の他方に流すと共に
所定の基準電圧を発生させるツエナダイオードと
、前記定電流の他の一部の電流が電源として流さ
れ入力端の一方に前記基準電圧が印加された演算
増幅器と、前記電流信号の他の一部がコレクタに
流されそのエミツタの電圧が前記演算増幅器の入
力端の他方に印加されそのベースが前記演算増幅
器出力で制御されるトランジスタとを具備し、こ
のトランジスタのエミツタから２線式伝送器の内
部電流を供給するようにしたことを特徴とする２
線式伝送器。 A two-wire system that receives power from the load side via a two-wire transmission line, converts the physical quantity to be measured into an electrical signal, processes the signal, and transmits it as a current signal to the load via the transmission line. In the transmitter, a constant current means takes in a part of the current signal from one of the output ends of the two-wire transmitter as a constant current, and a part of the constant current flows to the other output end of the two-wire transmitter, and a predetermined standard. A Zener diode that generates a voltage, an operational amplifier through which another part of the constant current is passed as a power supply and the reference voltage is applied to one of its input terminals, and another part of the current signal is applied to the collector. and a transistor whose emitter voltage is applied to the other input terminal of the operational amplifier and whose base is controlled by the output of the operational amplifier, and supplies the internal current of the two-wire transmitter from the emitter of the transistor. 2.
Wire transmitter.
JP14902289U 1989-12-25 1989-12-25 2-wire transmitter Expired - Lifetime JPH0710474Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14902289U JPH0710474Y2 (en) 1989-12-25 1989-12-25 2-wire transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14902289U JPH0710474Y2 (en) 1989-12-25 1989-12-25 2-wire transmitter

Publications (2)

Publication Number Publication Date
JPH0386489U true JPH0386489U (en) 1991-09-02
JPH0710474Y2 JPH0710474Y2 (en) 1995-03-08

Family

ID=31695447

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14902289U Expired - Lifetime JPH0710474Y2 (en) 1989-12-25 1989-12-25 2-wire transmitter

Country Status (1)

Country Link
JP (1) JPH0710474Y2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014112350A (en) * 2012-11-12 2014-06-19 Yokogawa Electric Corp Current output circuit and two-wire broadband transmitter having the same
JP2015060267A (en) * 2013-09-17 2015-03-30 横河電機株式会社 Current output circuit and two-wire broadband transmitter having the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014112350A (en) * 2012-11-12 2014-06-19 Yokogawa Electric Corp Current output circuit and two-wire broadband transmitter having the same
JP2015060267A (en) * 2013-09-17 2015-03-30 横河電機株式会社 Current output circuit and two-wire broadband transmitter having the same

Also Published As

Publication number Publication date
JPH0710474Y2 (en) 1995-03-08

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