CN201382786Y - Interior power supply circuit of site signal transducer - Google Patents
Interior power supply circuit of site signal transducer Download PDFInfo
- Publication number
- CN201382786Y CN201382786Y CN200820186093U CN200820186093U CN201382786Y CN 201382786 Y CN201382786 Y CN 201382786Y CN 200820186093 U CN200820186093 U CN 200820186093U CN 200820186093 U CN200820186093 U CN 200820186093U CN 201382786 Y CN201382786 Y CN 201382786Y
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- power supply
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- transmitter
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Abstract
The utility model relates to an interior power supply circuit of a site signal transducer, comprising a measuring component, an amplifying circuit, an A/I converting unit and a counting unit. The utility model is characterized in that in the direct current 24 V power supply loop circuit of the A/I converting unit and the counting unit provided by the system, DC/DC converters are arranged in series; the DC/DC converter is used as a measuring component and the amplifying circuit supplies the electric independently; and a signal separating unit and a voltage-stabilizing filtration unit are arranged in the power supply circuit thereof. The utility model utilizes the surplus voltage of the power supply loop circuit of the system, the transducer works under 4mA current of the loop circuit stably and reliably, thus effectively improving the antijamming capacity thereof.
Description
Technical field
The utility model relates to the current supply circuit of the on-site signal transmitter of measurement such as the procedure parameter that is applied to flow, temperature, pressure, liquid level, differential pressure.
Background technology
The on-site signal transmitter is used to measure procedure parameters such as the flow, temperature, pressure, liquid level, differential pressure of industry spot, and above-mentioned parameter reached the host computer management system through measuring, amplify, calculate, convert to standard signal, for the usefulness of management control system analysis, judgement, record, demonstration, control.
International standard signal commonly used is transmitted as two-wire system 4～20ma electric current, on behalf of the size of measured parameter, height, the big or small linear change of electric current change, this electric current also must be finished the power supply to transmitter itself simultaneously, because transducer signal is a conllinear with power supply, therefore when no signal, the electric current of 4ma just should be able to guarantee that transmitter can work reliably, and the on-site signal transmitter in the prior art is connected as shown in Figure 1 with system.
In Fig. 1, system powers to transmitter, and transmitter in-line power loop is: the transmitter input voltage is that Vs, electric current are 4～20ma, and this voltage, electric current are powered to computing unit, amplifying unit, measuring sensor via the A/I converting unit.
Current supply circuit shown in Figure 1 has the following disadvantages:
Although with the inner low energy-consumption electronic device that adopts of transmitter, and by economize on electricity measures such as intelligent time sharing power supplies to reduce power consumption, but some transmitter is still big owing to power consumption under power supply mode shown in Figure 1, can't therefore can't make the two-wire system industry spot signal transmitting device that satisfies international standard 4～20ma output in operate as normal under the 4ma electric current power supply.
When measuring sensor is used for the small-signal measurement, because semaphore is little, very easily be subjected to the electromagnetic interference (EMI) of other consumers of industry spot, in order to get rid of interference, often need measuring sensor part ground connection at the scene, but the supervisory computer control system in the pulpit for anti-interference if also taked grounding measures, then on electric, link with system owing to transmitter, power by system, transmitter is an ingredient of system on circuit, it is one, and the transmitter end " " and system end " " and since the bad or two places wide apart of ground connection will these two " " between form unsettled potential difference (PD), form and disturb, make that transmitter can't operate as normal.
The power supply of 4～20ma two-wire system analog quantity output transducer is normally provided by supervisory computer control system, direct current 24V, as shown in Figure 1.And the actual required operating voltage Vs of transmitter is not more than 14V, and the sample of signal resistance of supervisory computer control system is 250 Ω, and 4～20ma electric current is 5V in this ohmically maximum pressure drop.Therefore when the direct current 24V of system powered, it was 6V that loop has voltage Vp more than needed, and the transmitter in the prior art does not utilize this part voltage more than needed.
The utility model content
The utility model is for avoiding above-mentioned existing in prior technology weak point, a kind of on-site signal transmitter in-line power loop is provided, make the transmitter can reliable and stable work under loop 4ma electric current by utilization, and effectively improve its antijamming capability its loop voltage more than needed.
The utility model technical solution problem adopts following technical scheme.
The version in the utility model on-site signal transmitter in-line power loop is that described on-site signal transmitter comprises measuring sensor, amplifying circuit, A/I converting unit and computing unit;
Design feature of the present utility model is in the direct current 24V power supply loop that system provides for described A/I converting unit and computing unit, series connection is provided with the DC/DC converter, with described DC/DC converter is that measuring sensor and amplifying unit are independently-powered, and signalization is isolated and the voltage regulation filtering unit in its current supply circuit.
The utility model is by being provided with the DC/DC converter, both obtains measuring sensor and the required energy of amplifying circuit from the power supply loop, again measuring sensor and amplifying circuit are kept apart on electric with the power supply loop, thus the realization goal of the invention.
Compared with the prior art, the utility model beneficial effect is embodied in:
1, the utility model is arranged on the series connection of DC/DC converter in the direct current 24V of the system power supply loop, made full use of the rich voltage of power supply loop, but transducer signal measurement, the required energy supply of amplifying unit have been obtained, alleviate the computing unit of transmitter, the power consumption limitations of A/I converting unit, made most transmitters realize that loop 4ma electric current can reliablely and stablely work.
2, the normally faint small-signal of measured signal is very easily disturbed, and its power supply must stablize, noiseless.Signal measurement, amplifying circuit are isolated power supply separately by the DC/DC unit in the utility model, are not subjected to the disturbing effect of industry spot to transmitter, transmitter transmission line.Can't arrive measurement, amplifying unit by the DC/DC converter because disturb.
3, in the utility model when measuring sensor part must ground connection, because the signal measurement of transmitter, amplification circuits and the 4～20ma of system loop part isolation on electric, be two independently Circuits System, even system end ground connection like this, can not connect owing to measuring sensor yet " " with system's termination " " have potential difference (PD) to cause interference.
Description of drawings
Fig. 1 is the prior art structural representation.
Fig. 2 is the utility model structural representation.
Fig. 3 is another embodiment structural representation of the utility model.
Below by embodiment, the utility model is described in further detail in conjunction with the accompanying drawings.
Embodiment
Referring to Fig. 2, present embodiment is provided with supervisory computer control system and transmitter routinely, and wherein, the setting of transmitter unit comprises computing unit, A/I converting unit, amplifying unit and the in-site measurement element that is provided with routinely.
In the present embodiment, series connection is provided with the DC/DC converter in the direct current 24V of system power supply loop, independently-powered with the amplifying unit that obtains the measuring sensor output signal with the DC/DC converter for the measuring unit that constitutes by the in-site measurement element, and signalization is isolated and the voltage regulation filtering unit in its current supply circuit;
Shown in Figure 2, the transmitter in-line power is A, B two-way.The power supply of A road comprises A/I converting unit and computing unit; The power supply of B road comprises DC/DC converting unit, voltage regulation filtering and Signal Spacing unit, measuring sensor and amplifying unit; Power supply of A road and the power supply of B road are provided with for series connection in the 4～20ma of system current supply circuit.During no signal, the power supply of A partial circuit is input voltage Vs, electric current 4ma, has satisfied the power requirement of A partial circuit work; The power supply of B partial circuit is voltage Vp more than needed, and electric current 4ma has also satisfied the power requirement of B partial circuit work.When signal is arranged, signal amplifies through amplifying unit, isolate to be sent to computing unit and to calculate, convert to through the A/I converting unit again and be varied to 0～16ma electric current of direct ratio with measured signal and be superimposed upon on the 4ma quiescent current, final transmitter output be 4～20ma current signal.
Referring to Fig. 3, utilize the technical solution of the utility model, can use a direct supply, two leads is a plurality of separate electronic system power supplies, both energy efficient was saved the required expense of wiring again greatly.
Claims (1)
1, on-site signal transmitter in-line power loop, described on-site signal transmitter comprises measuring sensor, amplifying circuit, A/I converting unit and computing unit; It is characterized in that in the direct current 24V power supply loop that system provides for described A/I converting unit and computing unit, series connection is provided with the DC/DC converter, with described DC/DC converter is that measuring sensor and amplifying unit are independently-powered, and signalization is isolated and the voltage regulation filtering unit in its current supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820186093U CN201382786Y (en) | 2008-10-15 | 2008-10-15 | Interior power supply circuit of site signal transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820186093U CN201382786Y (en) | 2008-10-15 | 2008-10-15 | Interior power supply circuit of site signal transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201382786Y true CN201382786Y (en) | 2010-01-13 |
Family
ID=41526258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200820186093U Expired - Fee Related CN201382786Y (en) | 2008-10-15 | 2008-10-15 | Interior power supply circuit of site signal transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201382786Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444787A (en) * | 2015-11-19 | 2016-03-30 | 国电南瑞科技股份有限公司 | Direct current transmitter with high reliability |
-
2008
- 2008-10-15 CN CN200820186093U patent/CN201382786Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444787A (en) * | 2015-11-19 | 2016-03-30 | 国电南瑞科技股份有限公司 | Direct current transmitter with high reliability |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100113 Termination date: 20151015 |
|
| EXPY | Termination of patent right or utility model |