CN2222943Y - Low power loss constant-current two-wire system voltage and current transducer - Google Patents
Low power loss constant-current two-wire system voltage and current transducer Download PDFInfo
- Publication number
- CN2222943Y CN2222943Y CN 93246411 CN93246411U CN2222943Y CN 2222943 Y CN2222943 Y CN 2222943Y CN 93246411 CN93246411 CN 93246411 CN 93246411 U CN93246411 U CN 93246411U CN 2222943 Y CN2222943 Y CN 2222943Y
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- CN
- China
- Prior art keywords
- current
- power
- power supply
- signal
- wire system
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a low power loss constant-current two-wire system voltage and current transducer which is a transmitting device converting the weak voltage signals of a sensor into the current signals which can be transmitted for long range. The utility model is mainly composed of a power supplying part (1), a signal transmitting device (2) and a signal output part (3). The power supplying part adopts the composite power supplying method, namely, the output end of the voltage stabilizing block generates the power supply for an amplifier, the current for an input network bridge is taken from the regulating end of the voltage stabilizing block, the two power supplies do not interfere with each other, the signal converter 2 adopts two operational amplifiers connected in parallel, and the current signal output part (3) is taken from the power supply and a voltage stabilizing circuit.
Description
The utility model is the device that a kind of voltage signal with sensor acquisition is transformed into the current signal that can transmit at a distance, belongs to the technical field of surveying instrument coupling arrangement.
The signal that present various sensor is gathered generally has only several millivolts or tens millivolts, if this faint electric signal is transmitted at a distance is very difficult, therefore a device for signalling just must be arranged between surveying instrument and signal transducer, and just must be connected with signal wire and power lead between sort signal conveyer and the surveying instrument, in remote and transmission, every many leads, its cost will increase many, especially in weak signal transmits, the loss of its signal is also bigger, and its precision of surveying reason also is affected simultaneously.
Goal of the invention of the present utility model just provides a kind of low-power consumption constant current two-wire system voltage～current transducer that the signal of sensor acquisition can be transmitted at a distance.
Low-power consumption constant current two-wire system voltage of the present utility model, current transducer mainly are made up of power pack (1), signal converter (2), current signal output (3).Wherein power pack (1) adopts the composite power supply mode, promptly except the output terminal normal power supply of regulator block " WJ ", adjusts end voltage stabilizing diode " DW at it
1" two ends also simultaneously to bridge circuit (promptly by R
1, R
2, W
2, Rt
2The electric bridge of forming) power supply, power pack (1) adopts integrated voltage stabilizer " WJ ", its output terminal and resistance R
9Be connected R
9The other end and signal converter (2) in two operational amplifier Y
1With Y
2Power end be connected, between the adjustment end of integrated voltage stabilizer " WJ " and power supply negative terminal, be serially connected with two voltage stabilizing diode DW
1, DW
2, the adjustment end of integrated voltage stabilizer " WJ " and voltage stabilizing diode DW
1Negative terminal be connected voltage stabilizing diode DW
2just connect power supply negative terminal, signal converter (2) adopts two operational amplifiers relatively to amplify two operational amplifier Y
1With Y
2Input signal respectively from R in the output terminal of sensor and the electric bridge
2With W
2The contact place, in this electric bridge, resistance R
1, R
2Contact and stabilivolt DW
1Negative terminal join W
2Rt
2Contact and stabilivolt DW
1Anode join R
1With Rt
2Contact and the output terminal of sensor join.Current signal output (3) is serially connected in the circuit output circuit of power supply E.Promptly be serially connected between power supply E and the diode D1.The principle of work of this device is: after the compensation deals of resistor network, signal is input to the operational amplifier Y of two common modes inputs in parallel by the signal of sensor input
1With Y
2, constitute the unsteady tracing source of generating positive and negative voltage, after the feedback network effect, make the linear variation of tracing source electric current and input signal, thereby reach the purpose of conversion.
The power consumption that to adopt its advantage of low-power consumption constant current two-wire system voltage～current transducer of the present utility model be this transmitter is very low, is specially adapted to remote signal and transmits.Secondly, transmit signal and two leads of power sharing, so not only easy to use, and can save a large amount of leads.In addition, the processing mode uniqueness of this transmitter change-over circuit, the electric bridge that promptly adopts the resistance composition is as input circuit, and the power supply of this electric bridge only is to use the electric current of regulator block adjustment end without the electric current of primary power, like this, each uses its power supply amplifier and resistor network, does not disturb mutually.
Fig. 1 is a circuit structure block diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment of the present utility model is as follows: the regulator block in the power pack (1) adopts three-terminal voltage-stabilizing circuit LM317, adjusts between end and the negative pole at it and is serially connected with two voltage stabilizing diodes, the adjustment end of integrated voltage stabilizer " WJ " and voltage stabilizing diode DW
1Negative terminal be connected voltage stabilizing diode DW
2Positive termination power supply negative terminal, the voltage stabilizing value of two stabilivolts is 1.5V.The output terminal of mu balanced circuit and current-limiting protection resistance R
9Be connected R
9The other end and the operational amplifier Y in the signal converter (2)
1With Y
2Power end be connected, between its output terminal and the power supply E for load RL, the i.e. output terminal of power supply signal.Signal converter is based on the operational amplifier of two parallel connections, at the Y of two operational amplifiers
1With Y
2Feedback end between be connected to temperature and mend and taste resistance R t
3, operational amplifier Y
1With Y
2Adopting a model is LM324, in addition in the resistor network of input, by resistance R
1, R
2, variable resistor W
2, temperature mends that to taste be resistance Rt
3Form an electric bridge, and provide power supply by the adjustment end of mu balanced circuit, promptly the two ends of electric bridge are connected on stabilivolt DW respectively
1Two ends.Current signal output (3) is serially connected in power supply E and diode D
1Between.After above circuit part assembled, put into the machine box, it draws four wiring, two of A, B are the signal input part that connects sensor, two of C, D are the signal output part that connects load and power supply, the above makes and can form low-power consumption constant current two-wire system voltage of the present utility model, current transducer according to this.
Claims (3)
1, a kind of low-power consumption constant current two-wire system voltage, current transducer is made up of power unit, signal transformation part and output, it is characterized in that power pack (1) adopts integrated voltage stabilizer " WJ ", its output terminal and resistance R
9Be connected R
9The other end be connected with the power end of two operational amplifiers in the signal converter (2), between the adjustment end of integrated voltage stabilizer " WJ " and power supply negative terminal, be serially connected with two voltage stabilizing diode DW
1, DW
2, the adjustment end of integrated voltage stabilizer " WJ " and voltage stabilizing diode DW
1Negative terminal be connected voltage stabilizing diode DW
2Positive termination power supply negative terminal, power supply signal output (3) is serially connected in power supply E and diode D
1Between.
2. low-power consumption constant current two-wire system voltage according to claim 1, current transducer is characterized in that by R
1, R
2, W
2, Rt
2In the electric bridge of being formed, resistance R
1, R
2Contact and stabilivolt DW
1Negative terminal join W
2, Rt
2Contact and stabilivolt DW
1Positive pole join R
2With W
2Contact and operational amplifier Y
1Input end join.
3. low-power consumption constant current two-wire system voltage according to claim 1 and 2, current transducer is characterized in that at operational amplifier Y
2With Y
1Feedback end between be connected to a thermo-compensator Rt
3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93246411 CN2222943Y (en) | 1993-12-16 | 1993-12-16 | Low power loss constant-current two-wire system voltage and current transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93246411 CN2222943Y (en) | 1993-12-16 | 1993-12-16 | Low power loss constant-current two-wire system voltage and current transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2222943Y true CN2222943Y (en) | 1996-03-20 |
Family
ID=33819103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93246411 Expired - Fee Related CN2222943Y (en) | 1993-12-16 | 1993-12-16 | Low power loss constant-current two-wire system voltage and current transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2222943Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030901A (en) * | 2018-08-06 | 2018-12-18 | 安徽天光传感器有限公司 | A kind of built-in voltage electric current one transmitter |
-
1993
- 1993-12-16 CN CN 93246411 patent/CN2222943Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030901A (en) * | 2018-08-06 | 2018-12-18 | 安徽天光传感器有限公司 | A kind of built-in voltage electric current one transmitter |
| CN109030901B (en) * | 2018-08-06 | 2023-09-26 | 安徽天光传感器有限公司 | Built-in voltage and current integrated transmitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |