CN100559128C - The two-wire system transformer that has battery - Google Patents
The two-wire system transformer that has battery Download PDFInfo
- Publication number
- CN100559128C CN100559128C CNB2006100500493A CN200610050049A CN100559128C CN 100559128 C CN100559128 C CN 100559128C CN B2006100500493 A CNB2006100500493 A CN B2006100500493A CN 200610050049 A CN200610050049 A CN 200610050049A CN 100559128 C CN100559128 C CN 100559128C
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- circuit
- battery
- wire system
- function module
- extended function
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Abstract
A kind of two-wire system transformer that has battery, described transmitter connects controller or Distributed Control System (DCS) by two core cable, described transmitter comprises housing, is installed in power circuit, 4-20mA circuit, sensor, sensor circuit and microprocessor in the housing, and sensor connects microprocessor by sensor circuit; Battery, extended function module also are installed in the described housing, and the output terminal of battery connects extended function module, and the output terminal of described microprocessor connects extended function module.The invention provides a kind of two-wire system transformer of realizing that function is many, the expanded function cost is low.
Description
(1) technical field
The invention belongs to the transmitter field, particularly a kind of two-wire system transducer.
(2) background technology
Two-wire system transducer is applied to industry spot in a large number at present, realize the monitoring and the transmission of on-the-spot various parameters, as gas concentrations such as oxygen, carbon monoxide, only need between two-wire system transducer and controller or the Distributed Control System (DCS) (DCS) be connected by a two core cable, set up a 4-20mA electric current loop by this cable, realize that controller or DCS transmit to the current signal of controller to transmitter power supply and transmitter, its outstanding advantage is when transmitter and controller distance is far, such as 1000 meters, save cable expense, wiring simply.
For two-wire system transformer, the greatest problem of existence is at present: because want power supply and transmission signal on a two core cable simultaneously, and signal is the 4-20mA current forms, this will ask the electric current of circuitry consumes in the transmitter must be controlled at below the 4mA, cause two-wire system transducer can only dispose limited essential device like this, realize basic functions; Other function useful and extensive employing then can't realize, and have to realize by means of three-wire system or four-wire system transmitter the cost height.
Such as, two-wire system transformer can't be realized good display.If adopt charactron to show, single charactron power consumption is about 100mW, and current drain surpassed 4mA during charactron was lighted.If adopt liquid crystal display to add backlight, the current drain of liquid crystal display is very low; The current drain of whole transmitter surpassed 4mA during backlight was lighted.As seen can't adopt this two kinds of schemes, can only adopt not have demonstration or do not have the backlight liquid crystal display to show that display effect is poor.
Again for example, two-wire system transformer can't drive reports to the police and power transfer relay, thereby can't drive the acoustic scene light crossing-signal, and this is because though relay is interruption work, the current drain of whole transmitter surpasses 4mA in the moment of its work.
Again for example, two-wire system transformer can't be realized erasable to memory device thereby can't preserve parameter and historical data being set; Though erasable the interruption, erasable moment power consumption reaches 15mW, and the immediate current that reads also reaches 10mA.
(3) summary of the invention
In order to overcome the deficiency that expanded function is few, the expanded function cost is high in the existing two-wire system transformer, the invention provides a kind of two-wire system transformer that has battery of realizing that function is many, the expanded function cost is low.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of two-wire system transformer that has battery, described transmitter connects controller or Distributed Control System (DCS) by two core cable, described transmitter comprises housing, is installed in power circuit, 4-20mA circuit, sensor, sensor circuit and microprocessor in the housing, and sensor connects microprocessor by sensor circuit; Battery, extended function module also are installed in the described housing, and the output terminal of battery connects extended function module, and the output terminal of described microprocessor connects extended function module.
Further, described transmitter is a gas transmitter, and described sensor is a gas sensor.
Further again, described battery is a rechargeable battery, and charging circuit also is installed in the described housing; The input end of charging circuit is connected with power circuit, and the output terminal of charging circuit is connected with rechargeable battery.
Described rechargeable battery is provided with glue envelope shell.
Described extended function module is at least one in display backlight plate circuit, relay circuit, memory device, the infrared transmission module.
After in transmitter, adding battery, can satisfy under the condition of supply current less than 4mA, give the interruption of some other interpolation or the circuit supply of continuous working by battery, thereby realize greater functionality, demonstration for example backlight, drive relay, erasable etc. to memory device; The cost of battery or charging circuit is low again simultaneously.
(4) description of drawings
Fig. 1 is the two-wire system transducer synoptic diagram that has the intrinsic safety type charging circuit;
Fig. 2 is transmitter current drain and time chart;
Fig. 3 is a kind of intrinsic safety type charging circuit figure.
(5) embodiment
Below in conjunction with accompanying drawing the present invention is further described.
As shown in Figure 1, a kind of two-wire system 4-20mA gas transmitter, comprise tested gas sensor, housing and be installed in housing interior display module, 4-20mA circuit, sensor circuit, power circuit, microprocessor, display backlight plate circuit, E also are installed in the described housing
2Prom memory spare, relay circuit, charging circuit and rechargeable battery.The input end of charging circuit is connected with power circuit, and output terminal is connected with rechargeable battery; The output terminal of rechargeable battery is connected with display backlight plate circuit, relay circuit, memory device.Display module is made up of driving circuit and display screen, and connects microprocessor, power circuit.The input end of display backlight plate circuit connects rechargeable battery and microprocessor.The input end of relay circuit and memory device is connected with rechargeable battery, microprocessor.
As shown in Figure 2, the current drain that basic circuits such as display module, sensor circuit, power circuit, microprocessor produce in the transmitter is 3.1mA, the current drain that charging circuit produces is 0.5mA, and these circuit current drain that produces of working together is no more than 4mA.Extended function module in the transmitter-backlight circuit, relay circuit, memory circuit all are interruption work, and the working current of these circuit is respectively I
1, I
2, I
3, the current drain of whole transmitter can surpass 4mA during these circuit workings.It is that above-mentioned extended function module is powered that present embodiment uses rechargeable battery (also can with non-charge type battery), and therefore, the liquid crystal display that the described transmitter of this embodiment provides existing two-wire system transducer to provide is backlight, relay, E
2Functions such as prom memory.
Come the positive pole of the 4-20mA cable of self-controller to be connected to power circuit,, give display module, sensor circuit, microprocessor, charging circuit, 4-20mA circuit supply by the direct voltage source of a 4.5V of power circuit generation.The 4-20mA circuit is connected with the negative pole of 4-20mA cable.The voltage of rechargeable battery is about 3V, and rechargeable battery is to backlight circuit, relay circuit, memory circuit power supply, the electric current high flow rate when satisfying above-mentioned extended function module moment work.When microprocessor detected the electric quantity of rechargeable battery deficiency, the control charging circuit charged to rechargeable battery with the less electric current of 0.5mA.When microprocessor detects electric quantity of rechargeable battery and is full of, turn-off charging circuit.
If extended function module needs continuous working, can use non-charge type battery or rechargeable battery to power for these modules continuously.When non-charge type battery electric quantity is not enough, need to change battery.
The course of work of transmitter is: microprocessor is gathered transducing signal by sensor circuit, and microprocessor is handled signal, comprises A/D conversion, linear correction etc.; Microprocessor control display module shows then, and control 4-20mA circuit conversion becomes corresponding electric current to output to controller or DCS system; While microprocessor also control store device is preserved data; Surpass warning value if find data, microprocessor also wants control relay circuit to drive on-the-spot sound and light alarm.
As shown in Figure 3, a kind of intrinsic safety type charging circuit comprises rechargeable battery in the charging circuit, and intrinsic safety glue envelope is adopted in the outside of rechargeable battery.Adopt a kind of linear voltage regulator 5, resistance R among the figure
2, R
3Realize the output of 3.6V voltage; 3.6V voltage is by diode D
1, resistance R
4, R
5 Rechargeable battery 2 chargings to intrinsic safety glue envelope.By glue with resistance R
52 encapsulation are got up with rechargeable battery, realize intrinsic safe explosion-proof.By selecting resistance R
4, R
5With voltage stabilizing diode D
2, the current drain of guaranteeing whole charging circuit is below 0.5mA; Terminal 4 is the output of rechargeable battery, to display backlight plate circuit, relay circuit, memory circuit power supply; Lead-out terminal 3 inserts the A/D converter of microprocessor, realizes the sampling to charged battery voltage; Terminal 1 is connected to microprocessor, can realize the control to charging; Thereby realized the charging control of microprocessor to rechargeable battery.
Claims (9)
1, a kind of two-wire system transformer that has battery, described transmitter connects controller or Distributed Control System (DCS) by two core cable, described transmitter comprises housing, is installed in power circuit, 4-20mA circuit, sensor, sensor circuit and microprocessor in the housing, and sensor connects microprocessor by sensor circuit; Battery, extended function module also are installed in the described housing, it is characterized in that: described power circuit connects sensor circuit and microprocessor, described sensor circuit and microprocessor are powered by power circuit, the output terminal of described battery connects extended function module, and described extended function module is battery-powered.
2, the two-wire system transformer that has battery according to claim 1 is characterized in that: described transmitter is a gas transmitter.
3, the two-wire system transformer that has battery according to claim 1 and 2 is characterized in that: described battery is a rechargeable battery, and charging circuit also is installed in the described housing; The input end of charging circuit is connected with power circuit, and the output terminal of charging circuit is connected with rechargeable battery.
4, the two-wire system transformer that has battery according to claim 3 is characterized in that: described rechargeable battery is provided with glue envelope shell.
5, the two-wire system transformer that has battery according to claim 1 and 2 is characterized in that: described extended function module is a display backlight plate circuit.
6, the two-wire system transformer that has battery according to claim 1 and 2 is characterized in that: described extended function module is a relay circuit.
7, the two-wire system transformer that has battery according to claim 1 and 2 is characterized in that: described extended function module is a memory device.
8, the two-wire system transformer that has battery according to claim 1 and 2 is characterized in that: described extended function module is an infrared transmission module.
9, the two-wire system transformer that has battery according to claim 4 is characterized in that: described extended function module comprises display backlight plate circuit, relay circuit, memory device, infrared transmission module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100500493A CN100559128C (en) | 2006-03-28 | 2006-03-28 | The two-wire system transformer that has battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100500493A CN100559128C (en) | 2006-03-28 | 2006-03-28 | The two-wire system transformer that has battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1834588A CN1834588A (en) | 2006-09-20 |
| CN100559128C true CN100559128C (en) | 2009-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100500493A Expired - Fee Related CN100559128C (en) | 2006-03-28 | 2006-03-28 | The two-wire system transformer that has battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100559128C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283871B (en) * | 2018-09-28 | 2023-12-08 | 承德万达高新仪表有限公司 | Two-wire intelligent transmitter with dry contact output alarm function |
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2006
- 2006-03-28 CN CNB2006100500493A patent/CN100559128C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1834588A (en) | 2006-09-20 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Hangzhou City, Zhejiang province Binjiang District 310052 shore road 760 Patentee after: Focused Photonics (Hangzhou) Inc. Address before: Hangzhou City, Zhejiang province Binjiang District 310052 shore road 1180 No. 3 Patentee before: Juguang Sci. & Tech. (Hangzhou) Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091111 Termination date: 20150328 |
|
| EXPY | Termination of patent right or utility model |