CN104748881A - Pt1000 temperature transmitter with wide power supply range - Google Patents
Pt1000 temperature transmitter with wide power supply range Download PDFInfo
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- CN104748881A CN104748881A CN201510064548.7A CN201510064548A CN104748881A CN 104748881 A CN104748881 A CN 104748881A CN 201510064548 A CN201510064548 A CN 201510064548A CN 104748881 A CN104748881 A CN 104748881A
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- resistance
- chip
- xtr114
- pin
- diode
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- 238000010586 diagram Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000013475 authorization Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
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- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a Pt1000 temperature transmitter with a wide power supply range. The Pt1000 temperature transmitter comprises a housing, wherein a circuit board is arranged in the housing; the circuit board comprises a main board and a bottom board which are vertically mounted; an input terminal and an output terminal are welded at left and right ends of the bottom plate respectively; three guide wires are introduced on the input terminal; the main board comprises an open circuit detecting and signal filter circuit, a main control CPU (central processing unit) and a reverse-connection-preventing circuit. According to the Pt1000 temperature transmitter disclosed by the invention, the relationship between the resistance and the temperature can be converted into the relationship between the voltage and the temperature after certain current is added, the reverse-connection-preventing circuit utilizes the one-way continuity of a diode, the safety of the circuit is guaranteed, and the wide power supply range is realized due to the reasonable model and design of elements and circuit.
Description
Technical field
The present invention relates generally to temperature transmitter field, particularly relates to a kind of wide region and to power Pt1000 temperature transmitter.
Background technology
Pt1000 temperature transmitter uses during loop service and mostly is 24V direct current or 36V direct current, just cannot normally work when brownout or error-polarity connection.Many uses first order nonlinear corrects, and error is larger.Precision and the temperature drift of zero point drift itself, electric current output noise and range adjusting resistance send precision also can impact to change.Disclosed in Chinese patent Authorization Notice No. CN 202974490 U, PT1000 temperature transmitter voltage connects and instead just can not use.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, provides a kind of temperature for demarcating in warm area to carry out measuring and become the wide region sent and to power Pt1000 temperature transmitter.
The present invention is achieved by the following technical solutions:
Wide region is powered Pt1000 temperature transmitter, it is characterized in that: include housing, circuit board is provided with in housing, circuit board includes mainboard and base plate, mainboard and base plate at right angle setting, a left side for base plate, right two ends are welded with input terminal respectively, lead-out terminal, input terminal draws three wires, mainboard includes open circuit to detect and signal filter circuit, master cpu, reverse-connection preventing circuit, described master cpu adopts XTR114 chip, open circuit detects and includes triode Q2 with signal filter circuit, the emitter of triode Q2 is connected with wherein one end of the Article 1 wire of input terminal and resistance RCM, the other end of resistance RCM is connected with the Iret pin of XTR114 chip, resistance RCM is parallel with electric capacity C3, the base stage of triode Q2 is connected with wherein one end of the Article 2 wire of input terminal and resistance RZ, the other end of resistance RZ is respectively by node and resistance R2, one end of RL2 connects, resistance RL2 connects with resistance RL1, the two ends of resistance RL2 are respectively by the IR1 of node and XTR114 chip, Vlin pin connects, the collector of the other end of resistance RL1 and the Article 3 wire of input terminal and triode Q2, the IR2 pin of XTR114 chip connects, the other end of resistance R2 is connected with the Vin-pin of XTR114 chip, resistance R1 is connected with between the pin of the Vin+ of XTR114 chip and the collector of triode Q2, resistance R1, connected the electric capacity C1 of series connection by node between R2, C2, electric capacity C1, connected the Io pin of XTR114 chip by node between C2, resistance RG is serially connected with between two RG pins of XTR114 chip, the B of XTR114 chip, E, V+ pin respectively with the base stage of triode Q1, emitter, collector, the V+ of XTR114 chip, electric capacity C4 is connected between Io pin, electric capacity C4 is in parallel with clamper diode DZ, described reverse-connection preventing circuit includes end to end diode D1, D2, D4, D3, the negative pole of diode D2, D4 is connected, the positive pole of diode D1, D3 is connected, be connected with the V+ pin of XTR114 chip by node between diode D2, D4, connected by the Io pin of nodes X TR114 chip between diode D1, D3, draw a wire between diode D1, D2 and between diode D4, D3 respectively and be connected with lead-out terminal.
Described wide region is powered Pt1000 temperature transmitter, it is characterized in that: described housing bottom is provided with guide rail.
Described wide region is powered Pt1000 temperature transmitter, it is characterized in that: the parameter of described triode Q1 meets minimum V
cEO=45V, β=40.
The invention has the beneficial effects as follows:
The present invention is wide region loop service 7.5V ~ 36V, and power supply can reversal connection.Constant temperature region measurement-200 DEG C ~ 200 DEG C or-200 DEG C ~ 400 DEG C, use second nonlinear to correct, low zero point drift, low current output noise, accurately can record liquid nitrogen temperature (77K).
Advantage of the present invention is:
The present invention is converted to the relation of voltage and temperature after the pass of resistance and temperature can being tied up to and adding certain electric current, reverse-connection preventing circuit make use of the unidirectional general character of diode, ensure that the safety of circuit, utilize the reasonable selection of components and parts and circuit and design to achieve wide region and power.
Accompanying drawing explanation
Fig. 1 is structural schematic block diagram of the present invention.
Fig. 2 is the front view of housing.
Fig. 3 is the side view of housing.
Fig. 4 is the circuit theory diagrams of mainboard.
Fig. 5 is second nonlinear calibration curve schematic diagram.
Embodiment
As Figure 1-4, wide region is powered Pt1000 temperature transmitter, include housing 1, circuit board is provided with in housing 1, circuit board includes mainboard 2 and base plate 3, mainboard 2 and base plate 3 at right angle setting, a left side for base plate 3, right two ends are welded with input terminal P1 respectively, lead-out terminal P2, extraction three wires on input terminal P1, mainboard 2 includes open circuit to detect and signal filter circuit 4, master cpu 5, reverse-connection preventing circuit 6, described master cpu 5 adopts XTR114 chip, open circuit detects and includes triode Q2 with signal filter circuit, the emitter of triode Q2 is connected with wherein one end of the Article 1 wire of input terminal and resistance RCM, the other end of resistance RCM is connected with the Iret pin of XTR114 chip, resistance RCM is parallel with electric capacity C3, the base stage of triode Q2 is connected with wherein one end of the Article 2 wire of input terminal and resistance RZ, the other end of resistance RZ is respectively by node and resistance R2, one end of RL2 connects, resistance RL2 connects with resistance RL1, the two ends of resistance RL2 are respectively by the IR1 of node and XTR114 chip, Vlin pin connects, the collector of the other end of resistance RL1 and the Article 3 wire of input terminal and triode Q2, the IR2 pin of XTR114 chip connects, the other end of resistance R2 is connected with the Vin-pin of XTR114 chip, resistance R1 is connected with between the pin of the Vin+ of XTR114 chip and the collector of triode Q2, resistance R1, connected the electric capacity C1 of series connection by node between R2, C2, electric capacity C1, connected the Io pin of XTR114 chip by node between C2, resistance RG is serially connected with between two RG pins of XTR114 chip, the B of XTR114 chip, E, V+ pin respectively with the base stage of triode Q1, emitter, collector, the V+ of XTR114 chip, electric capacity C4 is connected between Io pin, electric capacity C4 is in parallel with clamper diode DZ, described reverse-connection preventing circuit includes end to end diode D1, D2, D4, D3, the negative pole of diode D2, D4 is connected, the positive pole of diode D1, D3 is connected, be connected with the V+ pin of XTR114 chip by node between diode D2, D4, connected by the Io pin of nodes X TR114 chip between diode D1, D3, draw a wire between diode D1, D2 and between diode D4, D3 respectively and be connected with lead-out terminal.
Guide rail 7 is installed bottom housing 1.
As shown in Figure 1: circuit board group composition is mainboard 2 and base plate 3, both at right angle settings.Be placed in together (accompanying drawing 2,3) in guide tracked housing 1.Constrained input terminal is respectively welded at the two ends, left and right of base plate 3.Mainboard 2 is groundwork circuit, is made up of three parts: open circuit detects and signal filter circuit; Master cpu, settling signal converts, and second nonlinear corrects; Reverse-connection preventing circuit, completes anti-overvoltage and reversal connection function.
Now by reference to the accompanying drawings 4, describe circuit theory:
P1 is platinum resistance Pt1000 input terminal, and three-wire system connects, and can eliminate the impact of a conductor impedance.P2 is lead-out terminal, and two-wire system is connected to collecting device.Wherein a road is power supply input, voltage range 7.5V ~ 36V.Another road is that current signal exports, 4 ~ 20mA.Triode Q2 is used for realizing Pt1000 open circuit and detects, and when open sensor, this transmitter exports minimum value.Resistance RCM is used to provide input offset voltage, all receives on Pt1000 Article 3 signal wire.Resistance RG, RZ, RL1, RL2 jointly complete range and set and the exterior arrangement resistance serving as second nonlinear correction.R1, C2 and R2, C1 form the RF filtering to sensor input voltage respectively, reduce the impact of Radio frequency interference (RFI) for measuring accuracy.C4 is used for reducing to export interference.The parameter of Q1 meets minimum V
cEO=45V, β=40.Q1 is used for improving the precision of output current, if do not use the current drain of master controller inside can reduce by 4 ~ 20mA electric current output accuracy.DZ is surge clamper diode, is used for preventing superpotential input from damaging transmission circuit.Diode D1, D2, D3, D4 form voltage reverse-connection preventing circuit jointly, can only have 2 diode current flows any time, so have the pressure drop of about 1V after operating voltage input.Master cpu carries out second nonlinear correction to signal, and effect curve is as accompanying drawing 5.
Claims (3)
1. wide region is powered Pt1000 temperature transmitter, it is characterized in that: include housing, circuit board is provided with in housing, circuit board includes mainboard and base plate, mainboard and base plate at right angle setting, a left side for base plate, right two ends are welded with input terminal respectively, lead-out terminal, input terminal draws three wires, mainboard includes open circuit to detect and signal filter circuit, master cpu, reverse-connection preventing circuit, described master cpu adopts XTR114 chip, open circuit detects and includes triode Q2 with signal filter circuit, the emitter of triode Q2 is connected with wherein one end of the Article 1 wire of input terminal and resistance RCM, the other end of resistance RCM is connected with the Iret pin of XTR114 chip, resistance RCM is parallel with electric capacity C3, the base stage of triode Q2 is connected with wherein one end of the Article 2 wire of input terminal and resistance RZ, the other end of resistance RZ is respectively by node and resistance R2, one end of RL2 connects, resistance RL2 connects with resistance RL1, the two ends of resistance RL2 are respectively by the IR1 of node and XTR114 chip, Vlin pin connects, the collector of the other end of resistance RL1 and the Article 3 wire of input terminal and triode Q2, the IR2 pin of XTR114 chip connects, the other end of resistance R2 is connected with the Vin-pin of XTR114 chip, resistance R1 is connected with between the pin of the Vin+ of XTR114 chip and the collector of triode Q2, resistance R1, connected the electric capacity C1 of series connection by node between R2, C2, electric capacity C1, connected the Io pin of XTR114 chip by node between C2, resistance RG is serially connected with between two RG pins of XTR114 chip, the B of XTR114 chip, E, V+ pin respectively with the base stage of triode Q1, emitter, collector, the V+ of XTR114 chip, electric capacity C4 is connected between Io pin, electric capacity C4 is in parallel with clamper diode DZ, described reverse-connection preventing circuit includes end to end diode D1, D2, D4, D3, the negative pole of diode D2, D4 is connected, the positive pole of diode D1, D3 is connected, be connected with the V+ pin of XTR114 chip by node between diode D2, D4, connected by the Io pin of nodes X TR114 chip between diode D1, D3, draw a wire between diode D1, D2 and between diode D4, D3 respectively and be connected with lead-out terminal.
2. wide region according to claim 1 is powered Pt1000 temperature transmitter, it is characterized in that: described housing bottom is provided with guide rail.
3. wide region according to claim 1 is powered Pt1000 temperature transmitter, it is characterized in that: the parameter of described triode Q1 meets minimum V
cEO=45V, β=40.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510064548.7A CN104748881A (en) | 2015-02-06 | 2015-02-06 | Pt1000 temperature transmitter with wide power supply range |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510064548.7A CN104748881A (en) | 2015-02-06 | 2015-02-06 | Pt1000 temperature transmitter with wide power supply range |
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| Publication Number | Publication Date |
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| CN104748881A true CN104748881A (en) | 2015-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510064548.7A Pending CN104748881A (en) | 2015-02-06 | 2015-02-06 | Pt1000 temperature transmitter with wide power supply range |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004434A (en) * | 2015-07-10 | 2015-10-28 | 成都振中电气有限公司 | Wireless temperature acquisition device with reversal connection protection function |
| CN107627077A (en) * | 2017-08-07 | 2018-01-26 | 海盐普源电力科技有限公司 | The production method of intelligent transfer device |
| CN110927406A (en) * | 2019-10-21 | 2020-03-27 | 合肥智敏热控科技有限公司 | On-line detection device of sensor |
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|---|---|---|---|---|
| US20040218662A1 (en) * | 2003-05-02 | 2004-11-04 | Ngk Spark Plug Co., Ltd. | Temperature sensor |
| CN2715131Y (en) * | 2004-06-21 | 2005-08-03 | 上海科宏电气控制组件有限公司 | Combined type temperature converter |
| CN101832620A (en) * | 2009-03-09 | 2010-09-15 | 北京天宇飞鹰微电子系统技术有限公司 | Air-conditioning controller for train environment |
| CN202382873U (en) * | 2011-12-08 | 2012-08-15 | 大连美天测控系统有限公司 | Intelligent temperature transmitter |
| CN202974490U (en) * | 2012-12-20 | 2013-06-05 | 烟台荏原空调设备有限公司 | PT1000 temperature transmitter |
| CN204405218U (en) * | 2015-02-06 | 2015-06-17 | 安徽万瑞冷电科技有限公司 | Wide region is powered Pt1000 temperature transmitter |
-
2015
- 2015-02-06 CN CN201510064548.7A patent/CN104748881A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040218662A1 (en) * | 2003-05-02 | 2004-11-04 | Ngk Spark Plug Co., Ltd. | Temperature sensor |
| CN2715131Y (en) * | 2004-06-21 | 2005-08-03 | 上海科宏电气控制组件有限公司 | Combined type temperature converter |
| CN101832620A (en) * | 2009-03-09 | 2010-09-15 | 北京天宇飞鹰微电子系统技术有限公司 | Air-conditioning controller for train environment |
| CN202382873U (en) * | 2011-12-08 | 2012-08-15 | 大连美天测控系统有限公司 | Intelligent temperature transmitter |
| CN202974490U (en) * | 2012-12-20 | 2013-06-05 | 烟台荏原空调设备有限公司 | PT1000 temperature transmitter |
| CN204405218U (en) * | 2015-02-06 | 2015-06-17 | 安徽万瑞冷电科技有限公司 | Wide region is powered Pt1000 temperature transmitter |
Non-Patent Citations (1)
| Title |
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| 陆召振: "柴油机电控单元电源系统电路设计", 《汽车电器》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004434A (en) * | 2015-07-10 | 2015-10-28 | 成都振中电气有限公司 | Wireless temperature acquisition device with reversal connection protection function |
| CN107627077A (en) * | 2017-08-07 | 2018-01-26 | 海盐普源电力科技有限公司 | The production method of intelligent transfer device |
| CN107627077B (en) * | 2017-08-07 | 2019-04-12 | 海盐普源电力科技有限公司 | The production method of intelligent transfer device |
| CN110927406A (en) * | 2019-10-21 | 2020-03-27 | 合肥智敏热控科技有限公司 | On-line detection device of sensor |
| CN110927406B (en) * | 2019-10-21 | 2022-01-04 | 合肥智敏热控科技有限公司 | On-line detection device of sensor |
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Application publication date: 20150701 |