CN202153161U - CAN bus-type intelligent platinum resistance thermometer - Google Patents
CAN bus-type intelligent platinum resistance thermometer Download PDFInfo
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- CN202153161U CN202153161U CN 201120253752 CN201120253752U CN202153161U CN 202153161 U CN202153161 U CN 202153161U CN 201120253752 CN201120253752 CN 201120253752 CN 201120253752 U CN201120253752 U CN 201120253752U CN 202153161 U CN202153161 U CN 202153161U
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Abstract
Disclosed is a CAN bus-type intelligent platinum resistance thermometer, relating to the on-site temperature measurement, transformation, and signal transmission in ship industry and other fields. The CAN bus-type intelligent platinum resistance thermometer comprises an armoured platinum resistor and an instrument case, wherein the instrument case is internally provided with an instrument circuit and a cable wiring port; the instrument circuit comprises a current acquisition processing circuit, a power supply circuit, a resistor coupling network, a resistor-signal-to-current circuit, an output interface, and a CAN bus interface circuit; the current acquisition processing circuit is respectively connected with the resistor coupling network and the resistor-signal-to-current circuit; the current acquisition processing circuit is also connected with the output interface via the CAN bus interface circuit; and the resistor coupling network is connected with the output interface via the resistor-signal-to-current circuit. The CAN bus-type intelligent platinum resistance thermometer of the utility model adopts the design of integrating a temperature sensor with the transforming and signal output instruments, and can simultaneously output DC 4mA-20 mA simulation signals and CAN bus signals.
Description
Technical field
The utility model relates to the scene temperature of industrial circles such as boats and ships to be measured, becomes and send and the signal transmission, particularly relates to a kind of CAN bus intelligent platinum-resistance thermometer.
Background technology
At present at industrial circles such as boats and ships; The realization of RTD temperature signal teletransmission generally adopts three-wire system or four-wire system to draw the connection lead; Supply power, convert into DC4mA～20mA simulating signal (current signal) by the far-end temperature transmitter, perhaps directly gather conversion by the temperature acquisition card of far-end, promptly present RTD temperature signal teletransmission will rely on remote equipment to realize basically; Therefore, in actual mechanical process, receive the influence of remote equipment easily.And along with the development of digital instrumentation and control technology, the intelligent measurement instrument application demand of teletransmission of band fieldbus increases gradually, and present platinum-resistance thermometer is generally exported DC4mA～20mA simulating signal, and range of application obviously is restricted.
The utility model content
The purpose of the utility model is in order to overcome the deficiency of above-mentioned background technology, provides a kind of temperature sensor to send and signal output meter circuit integrating design and can export the CAN bus intelligent platinum-resistance thermometer of DC4mA～20mA simulating signal and CAN bus signals simultaneously with becoming.
The CAN bus intelligent platinum-resistance thermometer that the utility model provides; It comprises armouring RTD and instrument case; Be provided with appliance circuit and cable connection mouth in the said instrument case; Said appliance circuit comprises that current acquisition treatment circuit, power circuit, resistors match network, resistance signal change current circuit, output interface and CAN bus interface circuit; Said current acquisition treatment circuit changes current circuit with resistors match network, resistance signal respectively and links to each other, and the current acquisition treatment circuit also links to each other with output interface through the CAN bus interface circuit, and the resistors match network changes current circuit through resistance signal and links to each other with output interface.
In technique scheme, the outside of said armouring RTD is with the stainless steel protection pipe, and said stainless steel protection pipe links to each other with instrument case through thread bush, bindiny mechanism, connection radiating tube successively.
In technique scheme, said connection radiating tube is provided with radiating fin.
In technique scheme; Said current acquisition treatment circuit comprises device U1; The CPU of said device U1 is the LM3S2276 chip; Device U1 comprises debugging interface, CAN_RX port, CAN_TX port and A/D convertor circuit, and device U1 links to each other with the CAN bus interface circuit through CAN_RX port, CAN_TX port.
In technique scheme, said power circuit comprises device U2 and U3, and said device U3 is the DC/DC converter, and said device U2 is a transformer, and device U2 links to each other with device U1.
In technique scheme; Said resistors match network comprises device U5, U6, resistance R 1 and R2; Device U5, U6 are digital regulation resistance; Resistance R 1 is the build-out resistor at zero point, and device U5, U6 all link to each other with device U1, and device U5, U6 change current circuit through resistance R 1, R2 with resistance signal respectively and link to each other.
In technique scheme, said CAN bus interface circuit comprises device U7, U8, and said device U7 is the CAN bus transceiver, and device U8 links to each other with U7 with device U1 respectively, and device U7 links to each other with output interface.
In technique scheme; Said resistance signal changes current circuit and comprises device U4, resistance R 3, triode Q1 and Q2, and said device U4 is the XTR105 chip, and device U4 links to each other with triode Q2 through resistance R 3; Triode Q2 links to each other with the resistors match network, and triode Q1 links to each other with power circuit.
The probe of armouring RTD is drawn three leads in the utility model; In the instrument case of thermometer top; Convert current signal into through resistors match network and XTR105 chip; Current signal carries out A/D collection and scale, format conversion through the LM3S2276 chip circuit, through output interface output DC4mA capable of being combined～20mA simulating signal and CAN bus signals.Adopt the different modes of connection in the serviceability temperature timing; Exportable DC4mA～20mA simulating signal or CAN bus signals; Also can export DC4mA～20mA simulating signal and CAN bus signals simultaneously, to satisfy the requirement of analog meter indication and digitizing thermometric simultaneously according to request for utilization.
Compared with prior art, the advantage of the utility model is:
(1) the utility model adopts appliance circuit and RTD is integrated, miniaturization Design, and platinum sensor is a Pt100 armouring platinum sensor, satisfies the marine condition requirement.
(2) the utlity model has change on the spot and send function, exportable current signal or CAN bus signals also can while output current signal and CAN bus signals.
(3) the utility model can carry out long-range setting of full scale and calibration to thermometer through the CAN bus, has avoided zero point and temperature drift.
(4) the utility model has adopted radiating fin, reduces the influence of measured medium temperature to appliance circuit, and measuring accuracy can reach 0.5%, and temperature-measuring range is 0 ℃～350 ℃.
(5) appliance circuit of the utility model is high temperature resistant, oneself power consumption is low, can satisfy 80 ℃ environment temperature request for utilization.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment;
Fig. 2 is the theory diagram of the utility model embodiment;
Fig. 3 is the circuit diagram of the utility model embodiment.
Among the figure: 1-armouring RTD, 2-stainless steel protection pipe, 3-thread bush, 4-bindiny mechanism; 5-connects radiating tube, 6-instrument case, 7-appliance circuit; 701-current acquisition treatment circuit, 702-power circuit, 703-resistors match network; The 704-resistance signal changes current circuit, 705-output interface, 706-CAN bus interface circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is done further to describe in detail:
Referring to shown in Figure 1; The CAN bus intelligent platinum-resistance thermometer that the utility model embodiment provides; Comprise armouring RTD 1 and instrument case 6, the probe length of armouring RTD 1 is customizable, and the outside of armouring RTD 1 is with stainless steel protection pipe 2; Stainless steel protection pipe 2 links to each other with instrument case 6 through thread bush 3, bindiny mechanism 4, connection radiating tube 5 successively; The length that connects radiating tube 5 is 150mm (customizable), is designed with radiating fin on it, to reduce the temperature effect of tested high-temperature medium to instrument case 6.Be provided with appliance circuit 7 and cable connection mouth in the instrument case 6.Present embodiment adopts stainless steel material and carries out waterproofing design, and 80 ℃ of appliance circuit 7 ability environment temperatures can satisfy peculiar to vesselization requirement.
Referring to shown in Figure 2; Appliance circuit 7 comprises that current acquisition treatment circuit 701, power circuit 702, resistors match network 703, resistance signal change current circuit 704, output interface 705 and CAN bus interface circuit 706; Current acquisition treatment circuit 701 changes current circuit 704 with resistors match network 703, resistance signal respectively and links to each other; Current acquisition treatment circuit 701 also links to each other with output interface 705 through CAN bus interface circuit 706, and resistors match network 703 changes current circuit 704 through resistance signal and links to each other with output interface 705.
Referring to shown in Figure 3; Current acquisition treatment circuit 701 comprises device U1; The CPU of device U1 is the LM3S2276 chip; Device U1 comprises debugging interface, CAN_RX port, CAN_TX port and A/D convertor circuit, and device U1 links to each other with CAN bus interface circuit 706 through CAN_RX port, CAN_TX port.Power circuit 702 comprises device U2 and U3, and said device U3 is the DC/DC converter, and said device U2 is a transformer, and device U2 links to each other with device U1.Resistors match network 703 comprises device U5, U6, resistance R 1 and R2; Device U5, U6 are digital regulation resistance; Resistance R 1 is the build-out resistor at zero point, and device U5, U6 all link to each other with device U1, and device U5, U6 change current circuit 704 through resistance R 1, R2 with resistance signal respectively and link to each other.CAN bus interface circuit 706 comprises device U7, U8, and device U7 is the CAN bus transceiver, and device U8 links to each other with U7 with device U1 respectively, and device U7 links to each other with output interface 705.Resistance signal changes current circuit 704 and comprises device U4, resistance R 3, triode Q1 and Q2; Said device U4 is the XTR105 chip; Device U4 links to each other with triode Q2 through resistance R 3, and triode Q2 links to each other with resistors match network 703, and triode Q1 links to each other with power circuit 702.
The course of work and the principle of the utility model embodiment are following:
Power supply is through pin one and pin 6 inputs of gang socket J2 in the output interface 705, and the input supply voltage scope is DC12～DC24V, but resistive conversion of signals current circuit 704 directly uses.Device U3 in the power circuit 702 is the DC/DC converter, is the power source conversion of input 5V, supplies CAN interface circuit 706 to use; Device U2 converts 5V into 3.3V, and power supply stream acquisition process circuit 701 uses.
R1 in the resistors match network 703 is the build-out resistor at zero point, select for use the resistance permissible variation be not more than ± 0.02%, resistance-temperature characteristic is not more than ± 5PPM.Device U5, U6 are digital regulation resistances; Its resistance can be set through the standard spi bus by current acquisition treatment circuit 701; Can be in 0 ℃～350 ℃ scopes according to user's request, set arbitrarily and calibrate the thermometric full scale through software, and need not make amendment hardware.
Platinum sensor adopts three-wire system to connect method, inserts through the socket J1 in the resistors match network 703, and three-wire system connects method can overcome the influence that the resistance on the transmission cable is gathered the RTD resistance.The RTD signal of input and resistor network are accomplished resistors match; Give resistance signal the corresponding resistance value of actual temperature signal and change the device U4 in the current circuit 704; Device U4 accomplishes the gamma correction of resistance signal at device inside; And according to the zero point of device U5, U6 setting in the resistors match network 703 and the resistance value of range and reality; Convert resistance signal the dc current signal of 4mA～20mA into, output to pin two and the pin 3 of socket J2 in the output interface 705 through the pin 7 of device U4.
The electric current of device U4 output flows through R4; Produce sampled voltage; Device U1 in the current acquisition treatment circuit 701 gathers this voltage through pin one; The A/D convertor circuit inner through device U1 is voltage transitions digital quantity, through scale transformation and format conversion, sends to digitized temperature value pin two and the pin 3 of device U8 in the CAN bus interface circuit 706.
Device U7 is the data-switching of CAN the needed differential voltage signal of CAN bus network in the CAN bus interface circuit 706, and device U8 accomplishes the isolation of internal circuit and CAN bus circuit, power supply is provided for simultaneously device U7.The pin 6 of device U7 is connected the pin 4 and pin 5 of socket J2 in the output interface 705 respectively with pin 7, thereby links to each other with outside CAN bus, can carry out two-way data communication.
The utility model embodiment specifically is provided with as follows:
Behind the selected temperature-measuring range of user; Can be long-range debugging interface through device U1 in CAN bus interface circuit 706 or the current acquisition treatment circuit 701; Send to device U1 to the temperature full scale value; Device U1 is written to the digital regulation resistance in the resistors match network 703 to corresponding resistance value again, thereby realizes measuring the setting of full scale, and the CAN bus of passing through that can be same is calibrated the full scale of thermometer.
The wiring explanation of the utility model embodiment:
The utility model embodiment provides three kinds of output modes: only export DC4mA～20mA simulating signal, only export CAN bus signals and export DC4mA～20mA simulating signal and CAN bus signals simultaneously.
A) only export DC4mA～20mA simulating signal
2 pin of socket J2 and 3 pin in the short circuit output interface 705,1 pin and 6 pin connect external power source.Outside sampling resistor can directly be connected in the power circuit, like this, and simultaneously by 1 pin and 6 pin output current signals.
B) only export the CAN bus signals
2 pin of socket J2 and 3 pin in the short circuit output interface 705,1 pin and 6 pin connect external power source, and 4 pin link to each other with outside CAN bus with 5 pin and carry out two-way data communication.This mode needs external 4 heart yearns.
C) export DC4mA～20mA simulating signal and CAN bus signals simultaneously
2 pin of socket J2 and 3 pin output current signals in the output interface 705,1 pin and 6 pin connect power supply, the external CAN bus signals of 4 pin and 5 pin.This way of output needs external 6 heart yearns.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.
The content of not doing in this instructions to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (8)
1. CAN bus intelligent platinum-resistance thermometer; It comprises armouring RTD (1) and instrument case (6); Be provided with appliance circuit (7) and cable connection mouth in the said instrument case (6); It is characterized in that: said appliance circuit (7) comprises that current acquisition treatment circuit (701), power circuit (702), resistors match network (703), resistance signal change current circuit (704), output interface (705) and CAN bus interface circuit (706); Said current acquisition treatment circuit (701) changes current circuit (704) with resistors match network (703), resistance signal respectively and links to each other; Current acquisition treatment circuit (701) also links to each other with output interface (705) through CAN bus interface circuit (706), and resistors match network (703) changes current circuit (704) through resistance signal and links to each other with output interface (705).
2. CAN bus intelligent platinum-resistance thermometer as claimed in claim 1; It is characterized in that: the outside of said armouring RTD (1) is with stainless steel protection pipe (2), and said stainless steel protection pipe (2) links to each other with instrument case (6) through thread bush (3), bindiny mechanism (4), connection radiating tube (5) successively.
3. CAN bus intelligent platinum-resistance thermometer as claimed in claim 2 is characterized in that: said connection radiating tube (5) is provided with radiating fin.
4. CAN bus intelligent platinum-resistance thermometer as claimed in claim 1; It is characterized in that: said current acquisition treatment circuit (701) comprises device U1; The CPU of said device U1 is the LM3S2276 chip; Device U1 comprises debugging interface, CAN_RX port, CAN_TX port and A/D convertor circuit, and device U1 links to each other with CAN bus interface circuit (706) through CAN_RX port, CAN_TX port.
5. CAN bus intelligent platinum-resistance thermometer as claimed in claim 4 is characterized in that: said power circuit (702) comprises device U2 and U3, and said device U3 is the DC/DC converter, and said device U2 is a transformer, and device U2 links to each other with device U1.
6. CAN bus intelligent platinum-resistance thermometer as claimed in claim 4; It is characterized in that: said resistors match network (703) comprises device U5, U6, resistance R 1 and R2; Device U5, U6 are digital regulation resistance; Resistance R 1 is the build-out resistor at zero point, and device U5, U6 all link to each other with device U1, and device U5, U6 change current circuit (704) through resistance R 1, R2 with resistance signal respectively and link to each other.
7. CAN bus intelligent platinum-resistance thermometer as claimed in claim 4; It is characterized in that: said CAN bus interface circuit (706) comprises device U7, U8; Said device U7 is the CAN bus transceiver, and device U8 links to each other with U7 with device U1 respectively, and device U7 links to each other with output interface (705).
8. like the described CAN bus intelligent of each claim platinum-resistance thermometer in the claim 1 to 7; It is characterized in that: said resistance signal changes current circuit (704) and comprises device U4, resistance R 3, triode Q1 and Q2; Said device U4 is the XTR105 chip; Device U4 links to each other with triode Q2 through resistance R 3, and triode Q2 links to each other with resistors match network (703), and triode Q1 links to each other with power circuit (702).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120253752 CN202153161U (en) | 2011-07-19 | 2011-07-19 | CAN bus-type intelligent platinum resistance thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120253752 CN202153161U (en) | 2011-07-19 | 2011-07-19 | CAN bus-type intelligent platinum resistance thermometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202153161U true CN202153161U (en) | 2012-02-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120253752 Expired - Fee Related CN202153161U (en) | 2011-07-19 | 2011-07-19 | CAN bus-type intelligent platinum resistance thermometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202153161U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575419A (en) * | 2013-10-16 | 2014-02-12 | 安徽蓝德仪表有限公司 | Anti-explosion temperature sensor for air compressor |
| CN104251749A (en) * | 2014-08-28 | 2014-12-31 | 广东狮能电气股份有限公司 | On-line monitoring system for oil temperature of transformer |
-
2011
- 2011-07-19 CN CN 201120253752 patent/CN202153161U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575419A (en) * | 2013-10-16 | 2014-02-12 | 安徽蓝德仪表有限公司 | Anti-explosion temperature sensor for air compressor |
| CN103575419B (en) * | 2013-10-16 | 2015-12-16 | 安徽蓝德仪表有限公司 | A kind of anti-explosion temperature sensor for air compressor |
| CN104251749A (en) * | 2014-08-28 | 2014-12-31 | 广东狮能电气股份有限公司 | On-line monitoring system for oil temperature of transformer |
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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: 20120229 Termination date: 20160719 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |