CN205679328U - Support critesistor, platinum resistance, the temperature collecting device of the mashed up measurement of copper resistance temperature sensor - Google Patents
Support critesistor, platinum resistance, the temperature collecting device of the mashed up measurement of copper resistance temperature sensor Download PDFInfo
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- CN205679328U CN205679328U CN201620621470.4U CN201620621470U CN205679328U CN 205679328 U CN205679328 U CN 205679328U CN 201620621470 U CN201620621470 U CN 201620621470U CN 205679328 U CN205679328 U CN 205679328U
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Abstract
The utility model discloses and a kind of support critesistor, platinum resistance, the temperature collecting device of the mashed up measurement of copper resistance temperature sensor, measuring plate passage to be connected with the sampled signal input of single-chip microcomputer by A/D module, the channel selecting signal outfan of single-chip microcomputer is connected with measuring plate passage by channel selection circuit；3/8 decoder input is connected with single-chip microcomputer, 3/8 decoder No. one outfan passes through bus driver and two photoelectric coupled devices, each photoelectric coupled device connects four relays respectively, and another road outfan of 3/8 decoder and two dual four-way analog multiplexers are connected.This utility model TLP521 band Phototube Coupling function, increases safety, reduces circuit interference.The most external current limiting safeguard resistor of photoelectric coupled device input, outfan, can play good current-limiting protection effect.Design different sample circuits, the mashed up measurement of the different resistance temperature sensor of support, simple in construction, easy to use, design and realize low cost.
Description
Technical field
This utility model relates to a kind of supporting critesistor, platinum resistance, the temperature of the mashed up measurement of copper resistance temperature sensor
Harvester.
Background technology
During concrete setting, produce the heat of hydration and make concrete temperature raise and deform and cause crack, to dam safety
Bring great hidden danger.At present, the monitoring of concrete temperature mainly uses manual type: use manual site's reading and indoor whole
Reason, the monitor mode of analysis of data so that the poor real of temperature monitoring, and have personal error, this personal error is not only
Surveyed concrete temperature value is the most artificially adjusted under the pressure of the requirement of project progress relevant with monitoring personnel, and by the skill of personnel
The factor impacts such as art level, survey measurements custom, it is impossible to show the real situation of concrete, to quality and the seat belt of dam
Carry out hidden danger.
Concrete Temperature Monitor System can substitute for Traditional Man monitoring, it is achieved the real-time monitoring of concrete temperature, effectively
Solve personal monitoring to waste time and energy, surveys and read not in time, have blind section, the problem such as personal error.In order to improve data acquisition efficiency and
Reduce cost to put into, it is achieved large-scale data acquisition, need to use multiplexer channel sensor data acquisition plate, gather data
When, once can only gather a sensing data, so multiplexer channel need to be designed cut-off selection circuit, when gathering data
Open the passage of selection, disconnect other passages, gathered rear reselection and opened next passage, disconnected other passages, successively
Gathering multiple sensing data, traditional sampling system cannot support the mashed up measurement of different resistance temperature sensor.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, it is provided that a kind of use relay selects temperature data
Passage, dual four-way analog multiplexer select the support critesistor of IIC passage, platinum resistance, copper resistance temperature sensing
The temperature collecting device of the mashed up measurement of device, has the feature such as low noise, low drifting.
The purpose of this utility model is achieved through the following technical solutions: support critesistor, platinum resistance, copper resistance
The temperature collecting device of the mashed up measurement of temperature sensor, including eight temperature sensors, line collecting plate passage, measures plate passage, AD
Module, channel selection circuit and single-chip microcomputer, eight temperature sensors are by 3K Ω thermistor temperature sensor, PT1000 platinum resistance
Temperature sensor and copper resistance temperature sensor composition, each temperature sensor is respectively by line collecting plate passage and measurement plate passage phase
Even, measure plate passage and be connected with the sampled signal input of single-chip microcomputer by A/D module, the channel selecting signal output of single-chip microcomputer
Hold and be connected with measuring plate passage by channel selection circuit；
Described channel selection circuit includes 3/8 decoder, bus driver, two photoelectric coupled devices, eight relays
Device and two dual four-way analog multiplexers, the input of 3/8 decoder is connected with single-chip microcomputer, the one of 3/8 decoder
Road outfan passes through bus driver and two photoelectric coupled devices, and each photoelectric coupled device connects four relays respectively,
Another road outfan of 3/8 decoder and two dual four-way analog multiplexers are connected；
Described A/D module includes conversion chip, 3K critesistor sample circuit and PT1000 platinum resistance/copper resistance sampling
Circuit, the serial clock input pin of conversion chip is connected with the serial clock output pin of single-chip microcomputer, the numeral of conversion chip
Output pin is connected with the digital input pins of single-chip microcomputer, and the digital input pins of conversion chip draws with the numeral output of single-chip microcomputer
Foot connects, and the output of 3K critesistor sample circuit is connected with the first simulation input pin of conversion chip, and PT1000 platinum resistance/
The output of copper resistance sample circuit is connected with the second simulation input pin of conversion chip；
Described 3K critesistor sample circuit includes the first high-accuracy metal platinum resistance RJM1, resistance R92 and electric capacity
C94, one end of the first high-accuracy metal platinum resistance RJM1 is connected with reference voltage REF, and the other end passes through electric capacity C94 ground connection, 3K
Thermistor temperature sensor is parallel on the points of common connection of the first high-accuracy metal platinum resistance RJM1 and electric capacity C94, these public affairs
Junction point is connected with the first simulation input pin of conversion chip by resistance R92 altogether；Described PT1000 platinum resistance/copper resistance
Sample circuit includes the second high-accuracy metal platinum resistance RJM2, resistance R93 and electric capacity C95, the second high-accuracy metal platinum resistance
One end of RJM2 is connected with reference voltage REF, and the other end passes through electric capacity C95 ground connection, PT1000 platinum resistance temperature sensor or copper
Resistance temperature sensor is parallel on the points of common connection of the second high-accuracy metal platinum resistance RJM2 and electric capacity C95, this public company
Contact is connected with the second simulation input pin of conversion chip by resistance R93.
3/8 described decoder uses 74HC137 chip, and the VCC energization pins of 74HC137 chip is by the electric capacity of series connection
C21 ground connection.
Described bus driver uses 74HC245 chip, and the VCC energization pins of 74HC245 chip is by the electricity of series connection
Hold C31 ground connection.
Described photoelectric coupled device uses TLP521 chip, and the input ANO of TLP521 chip is all by the first current limliting
Resistance connects positive voltage, and the input CAT of TLP521 chip connects control input respectively, and the outfan EMI of TLP521 chip is respectively
Connect the second current-limiting resistance.
Described conversion chip uses AD7192 chip.
The first described high-accuracy metal platinum resistance RJM1 is 1/8W-2.4K resistance, the second high-accuracy metal platinum resistance
RJM2 is 1/8W-1.1K resistance.
The beneficial effects of the utility model are:
1) use 8 paths sensor data acquisition plates, when gathering data, open the passage of selection, disconnect other passages,
The most only gather a sensing data, gathered rear reselection and opened next passage, gathered 8 sensor numbers successively
According to, easy to use, reliable.
2) using 3/8 decoder 74HC137 to realize chip select functionality, bus driver 74HC245 extends P0 port function
And increase driving force.
3) TLP521 is photoelectric coupled device, with Phototube Coupling function, adds safety, reduces circuit interference,
Each TLP521 can drive 4 relays, can complete the selection to 8 passages.
4) 74HC137 external capacitor C21 can effectively filter decoupling, makes power level more stable.
5) the most external current limiting safeguard resistor of photoelectric coupled device input outfan, can play good current-limiting protection and make
With, it is to avoid electric current is excessive burns photoelectric coupling chip or relay.
6) design different sample circuits, support the mashed up measurement of different resistance temperature sensor, simple in construction, user
Just, design and realize low cost.
7) input signal of sensor is resistance, and being converted into voltage signal could be added precisely by ADC acquisition process
REF5V voltage and a high-accuracy metal platinum resistance (RJM1, RJM2) of connecting, then can be exchanged into voltage signal, and in order to make
Input signal is more stable, then filters (R92-C94, R93-C95) through RC, and RC filter circuit is simple, and strong interference immunity has relatively
Good low frequency filtering performance, finally accesses the input pin of A/D chip.
Accompanying drawing explanation
Fig. 1 is this utility model circuit block diagram；
Fig. 2 is this utility model channel selection circuit block diagram；
Fig. 3 is that this utility model 74HC137 connects circuit theory diagrams；
Fig. 4 is this utility model 74HC137 truth table；
Fig. 5 is that this utility model 74HC245 connects circuit theory diagrams；
Fig. 6 is the internal schematic diagram of this utility model TLP521-4；
Fig. 7 is that this utility model TLP521-4 connects circuit theory diagrams；
Fig. 8 is the internal schematic diagram of this utility model relay；
Fig. 9 is this utility model relay drive circuit schematic diagram；
Figure 10 is this utility model CD4052 truth table；
Figure 11 is that this utility model CD4052 connects circuit theory diagrams；
Figure 12 is that this utility model AD7192 connects circuit theory diagrams；
Figure 13 is this utility model 3K critesistor sample circuit schematic diagram；
Figure 14 is this utility model PT1000 platinum resistance/copper resistance sample circuit schematic diagram.
Detailed description of the invention
The technical solution of the utility model is described in further detail below in conjunction with the accompanying drawings, but protection domain of the present utility model
It is not limited to the following stated.
The present embodiment uses 8 paths sensor data acquisition plates, product gathers data when, once can only gather
One sensing data, so 8 paths need to be designed cut-off selection circuit, opens the passage of selection, disconnects when gathering data
Other passages, have gathered rear reselection and have opened next passage, disconnect other passages, gather 8 sensing datas successively.
Need to use 3/8 decoder 74HC137 and make chip select functionality use, in order to extend P0 port function and increase driving
Ability, with the addition of 74HC245 bus driver, in order to drive photoelectric coupled device TLP521, connects relay and can complete list
The sheet machine selection function to passage, circuit uses CD4052 dual four-way analog multiplexer in order to transceiving data, completes
Collecting work.
As it is shown in figure 1, support critesistor, platinum resistance, the temperature collecting device of the mashed up measurement of copper resistance temperature sensor,
Including eight temperature sensors, line collecting plate passage, measure plate passage, A/D module, channel selection circuit and single-chip microcomputer, eight temperature
Sensor is passed by some 3K thermistor temperature sensors, some PT1000 platinum resistance temperature sensors and some copper resistance temperature
Sensor forms, and each temperature sensor is connected with measuring plate passage by line collecting plate passage respectively, measures plate passage and passes through A/D module
Being connected with the sampled signal input of single-chip microcomputer, the channel selecting signal outfan of single-chip microcomputer passes through channel selection circuit and measurement
Plate passage is connected；Temperature sensor is connected on respective passage, and single-chip microcomputer selects Measurement channel by channel selection circuit, in choosing
In the passage selected, single-chip microcomputer passes through iic bus read sensor information data, and A/D module also begins to collecting temperature data simultaneously,
Single-chip microcomputer reads the temperature data in A/D chip by spi bus, gathers each passage the most successively.
As in figure 2 it is shown, channel selection circuit includes 3/8 decoder 74HC137, bus driver 74HC245, two photoelectricity
The dual four-way analog multiplexer CD4052 of coupled apparatus TLP521, eight relays and two, the input of 3/8 decoder
End is connected with single-chip microcomputer, and a road outfan of 3/8 decoder passes through bus driver and two photoelectric coupled devices, each photoelectricity
Coupled apparatus connects four relays respectively, and another road outfan of 3/8 decoder and two dual four-way Multipexers are multiple
It is connected with device.Single-chip microcomputer by this circuit can complete 8 passages selection (relay is used for selecting temperature data passage,
CD4052 is used for selecting IIC passage).Use 3/8 decoder chip 74HC137 to elect device, 74HC245 and CD4052 is entered
Row sheet selects.74HC245 is bus driver, can drive TLP521 element after enabling it.TLP521 is photoelectrical coupler
Part, with Phototube Coupling function, increases safety, reduces circuit interference, and each TLP521 can drive 4 relays (can drive altogether
Dynamic 8 relays), complete the selection to 8 passages.CD4052 is dual four-way analog multiplexer, and use two panels can
8 passages are selected.
Single-chip microcomputer is divided into two parts to the collection of sensor: 1. read sensor information；2. collecting temperature data.Sensor
Information includes: numbering, model.N-th (1≤n≤8) passage opening CD4052 chip selected by single-chip microcomputer by programme-control,
By IIC Double wire transmission agreement and sensor internal chip communication on this passage, read factory number and the model of this sensor,
Single-chip microcomputer continues selected relay the n-th passage of opening of programme-control afterwards, and now the temperature line of this passage is access in A/D module and enters
Row conversion, single-chip microcomputer is by reading temperature data with A/D module communication, and this channel acquisition has judged 8 passages the most after completing
Collection completes, if having gathered, closing peripheral circuit and entering standby mode, if also passage does not gather, under continuing to gather
One passage.
As it is shown on figure 3,74HC137 is the decoder that a piece of 3 lines turn 8 lines, have 16 pins: 1,2,3 foot A0, A1, A2
It is 3 line decoding inputs；4,5,6 foot LE, E1, E2 are Enable Pin；8 foot GND；16 foot VCC power；These 8 pins of Y0 ~ Y7 are decoding
The decoding output of device 8 line.The VCC energization pins of 74HC137 chip is by the electric capacity C21 ground connection of series connection, and external capacitor C21 is used for filtering
Ripple decouples, and makes power level more stable.It is that chip input selects foot that A0 ~ A2 meets single-chip microcomputer P0.0 ~ P0.2, and 4 foot LE connect single-chip microcomputer
P4.6 is in order to enable control 74HC137 chip, and E1 ground connection, E2 connect positive voltage and enable for opening.In this circuit arrangement, only employ
Y0, Y3, Y4 output port, Y0 is the enable foot of 74HC245 chip, and Y3, Y4 are the enable foot of two panels CD4052 chip.At this electricity
Lu Zhong, only uses 1 74HC137 just can enable three chips controlling next stage.About the working method of 3/8 decoder, can
Check 74HC137 truth table, as shown in Figure 4, decode input by Enable Pin and 3 lines, a certain foot electricity in 8 line outputs can be made
Position drags down, it can be seen that, 74HC137 can be used to, as selector, output pin be received the Enable Pin of next stage chip, just may be used
To enable 8 one of them chips of chip and to make its work.
As it is shown in figure 5,74HC245 is a kind of ternary output, eight road signal transceivers, it is mainly used in large-size screen monitors and shows, with
And other consumer electronics product is made bus extension and driving.In this circuit, we use it for single-chip processor i/o port
Extension, makes P0 port complete more function, and this chip drives ability is relatively strong simultaneously, and single-chip microcomputer can be well by this chip
Drive next stage chip TLP521.In structure, the VCC energization pins of 74HC245 chip is by the electric capacity C31 ground connection of series connection, same
Sample plays filtering decoupling effect.
TLP521 is controllable photoelectric coupled device, and the signal being widely used between all kinds of electron product circuit passes
Defeated, by photoelectric coupling, it is allowed to front end completely isolated with load, increases safety, reduce circuit interference, simplify circuit design.
Fig. 6 is the inside schematic diagram of TLP521-4: by certain forward current between 1,2 feet, by photoelectric coupling, 15,16 feet are just
Can turn on, a TLP521-4 chip contains 4 photoelectric coupling passages.
As it is shown in fig. 7, TLP521 chip input ANO connects positive voltage, by 5.1K resistance current-limiting protection；Input CAT
For controlling input, when for high level, corresponding COL's and EMI is separated, turns on during low level；Export external 10K resistance to use
In current-limiting protection.By controlling the level height of CAT, cut-offfing of respective channel just can be controlled.
Native system is 8 channel acquisition systems, can gather the data of 8 passages, and present, and the control circuit of prime is the most
Through have the ability drive 8 passages, and this one-level we need selective relay to realize cut-offfing of these 8 passages.
What relay generally used is electromagnetic type relay, and electromagnetic type relay is typically by iron core, coil, armature, contact
Reed forms, and as shown in Figure 8, as long as adding certain voltage at coil two ends 1 foot and 16 feet, makes have electric current to flow through in coil, and 9
Foot and 13 feet will turn on, and 8 feet and 4 feet also can turn on simultaneously, work as current vanishes, and just now turned on will disconnect, and 11 feet with
13 feet then can turn on, and 6 feet and 4 feet are also switched on simultaneously, thus reach the purpose of conducting in circuit, cut-out.
As it is shown in figure 9, relay drive circuit: v2+, v2-are applied voltage (being provided by power module DY05D0505),
NTC1 is 3K thermistor temp line, and RTD1 is PT1000 platinum resistance/copper resistance temperature line, and CP1 is that 3K thermistor temp is defeated
Line sending, CP2 is PT1000 platinum resistance/copper resistance temperature pipeline.Diode Dk1 voltage-stabilizing protection, audion Q1 continues for control
Electrical equipment break-make.Operation principle: circuit is by the output pin of cou1(chip TLP521-4) height of level, control opening of Q1
Disconnected, thus indirectly control relay and cut-off, when cou1 is high level, audion Q1 turns on, and relay K 1 is started working, and makes
Turn between conducting, RTD1 and CP2 between NTC1 and CP1, thus the temperature line of temperature sensor is passed to A/D module.3K heat
Quick resistance and PT1000 platinum resistance/copper resistance can only select one to access circuit.
CD4052 is dual four-way analog multiplexer/demultiplexer, with Professional Association logical end, often
Individual multiplexer has four independent input/output (0X ~ 3X, 0Y ~ 3Y) and a public input/output terminal (X, Y).
Public passage selects logical end to include two numerals and selects input (A, B) and the input (INH) of a Low level effective.
The truth table of CD4052 is as shown in Figure 10.As shown in figure 11, A, B foot of chip CD4052 meets single-chip microcomputer P0.0 and P0.1, is used for
Select to open the wherein corresponding a certain passage of four-way；X, Y connect clock line (SCL2) and data wire (SDA1), lead at selected
In road, read the data of sensor side numbering board memory storage with IIC sequential；Enable Pin INH connects the output pin of Y3(74HC137),
This chip is selected to make its work for sheet.
A/D module is the maincenter of acquisition system, and temperature and resistance accesses A/D module, after converted, monolithic by temperature line
Machine and A/D module communication, read the temperature data collected.Native system uses AD7192 chip, and this chip is a ultralow
Noise, 24 ∑s of low drifting-type ADC transducer, have single analog power and digital power.Analog portion must use
Precisely 5V power supply is powered, and digital power is independent of analog power, can input the free voltage in the range of 2.7V ~ 5.25V, by
Using 5V voltage in single-chip microcomputer, therefore DVDD also must use 5V power supply to power.
It is analog circuit that AD gathers, and must separate with numerical portion, uses independent power supply to power, and separately cloth ground wire.
It is that it provides stable+5V analog power voltage used here as 78L05 stabilivolt, and uses ADR425 voltage stabilizing chip to provide essence
Accurate+5V benchmark gathers supply voltage.
AD7192 is a to be suitable for the high-accuracy low noise full simulation front end measuring application, a built-in low noise, 24
Position sigma-delta pattern number converter (ADC), in sheet, low noise gain level means to directly input small-signal.This device can be joined
Being set to two-pass DINSAR input or four tunnel pseudo-differential inputs, sheet internal channel serial device can enable multiple passage, and AD7192 is in order
Performing conversion on each enable passage, this can simplify the communication with device.In sheet, 4.92 MHz clocks can serve as ADC's
Clock source, or external clock or crystal oscillator can also be used.
As shown in figure 12, A/D module includes conversion chip (AD7192), 3K critesistor sample circuit and PT1000 platinum electricity
Resistance/copper resistance sample circuit, the serial clock input pin (3 foot SCLK) of conversion chip draws with the serial clock output of single-chip microcomputer
Foot (ADSCK) is connected, and the digital output pin (23 foot DOUT) of conversion chip connects with the digital input pins (ADOUT) of single-chip microcomputer
Connect, in order to transmit data to single-chip microcomputer；The digital input pins (24 foot DIN) of conversion chip and the digital output pin of single-chip microcomputer
(ADDIN) connect, in order to receive the data that single-chip microcomputer transmits.The output of 3K critesistor sample circuit and the first of conversion chip
Simulation input pin is connected, and the output of PT1000 platinum resistance/copper resistance sample circuit is simulated input with the second of conversion chip and drawn
Foot is connected.
In programming, AD7192 is configured to dual pathways bipolarity mode of operation, i.e. AIN1-AIN2 is a collection
Passage (AIN2 ground connection, AIN1 connects 3K critesistor, in order to gather the input signal of 3K critesistor), AIN3-AIN4 is another
(AIN4 ground connection, AIN3 connects PT1000 platinum resistance/copper resistance to individual acquisition channel, in order to gather the defeated of PT1000 platinum resistance/copper resistance
Enter signal).Acquiescence gathers as 3K critesistor, if this channel acquisition is less than signal, then ALT-CH alternate channel gather PT1000 platinum resistance/
The input signal of copper resistance.
As shown in figure 13, described 3K critesistor sample circuit includes the first high-accuracy metal platinum resistance RJM1, resistance
R92 and electric capacity C94, the first high-accuracy metal platinum resistance RJM1(1/8W-2.4K) one end be connected with reference voltage REF, another
End is by electric capacity C94 ground connection, and 3K thermistor temperature sensor is parallel to the first high-accuracy metal platinum resistance RJM1 and electric capacity C94
Points of common connection on, this points of common connection is connected by the first simulation input pin of resistance R92 and conversion chip.
As shown in figure 14, described PT1000 platinum resistance/copper resistance sample circuit includes the second high-accuracy metal platinum resistance
RJM2(1/8W-1.1K), resistance R93 and electric capacity C95, one end of the second high-accuracy metal platinum resistance RJM2 and reference voltage REF
Being connected, the other end passes through electric capacity C95 ground connection, and PT1000 platinum resistance temperature sensor or copper resistance temperature sensor are parallel to second
On the points of common connection of high-accuracy metal platinum resistance RJM2 and electric capacity C95, this points of common connection passes through resistance R93 and conversion chip
Second simulation input pin be connected.
The input signal of sensor is resistance, and being converted into voltage signal could be by ADC acquisition process, and we are plus essence
Quasi-REF5V voltage and a high-accuracy metal platinum resistance (RJM1, RJM2) of connecting, then can be exchanged into voltage signal, and in order to
Making input signal more stable, then filter (R92-C94, R93-C95) through RC, RC filter circuit is simple, and strong interference immunity has
Preferably low frequency filtering performance, finally accesses the input pin of A/D chip.
The above is only preferred implementation of the present utility model, it should be understood that this utility model is not limited to herein
Disclosed form, is not to be taken as the eliminating to other embodiments, and can be used for other combinations various, amendment and environment, and
Can be modified by above-mentioned teaching or the technology of association area or knowledge in contemplated scope described herein.And this area
Change that personnel are carried out and change, the most all should be in rights appended by this utility model without departing from spirit and scope of the present utility model
In the protection domain required.
Claims (6)
1. support critesistor, platinum resistance, the temperature collecting device of the mashed up measurement of copper resistance temperature sensor, it is characterised in that:
Including eight temperature sensors, line collecting plate passage, measure plate passage, A/D module, channel selection circuit and single-chip microcomputer, eight temperature
Sensor is made up of 3K Ω thermistor temperature sensor, PT1000 platinum resistance temperature sensor and copper resistance temperature sensor,
Each temperature sensor is connected with measuring plate passage by line collecting plate passage respectively, measures plate passage by A/D module and single-chip microcomputer
Sampled signal input connects, and the channel selecting signal outfan of single-chip microcomputer is by channel selection circuit and measurement plate passage phase
Even；
Described channel selection circuit include 3/8 decoder, bus driver, two photoelectric coupled devices, eight relays and
Two dual four-way analog multiplexers, the input of 3/8 decoder is connected with single-chip microcomputer, and a road of 3/8 decoder is defeated
Going out to hold by bus driver and two photoelectric coupled devices, each photoelectric coupled device connects four relays respectively, and 3/8 translates
Another road outfan and two dual four-way analog multiplexers of code device are connected；
Described A/D module includes conversion chip, 3K critesistor sample circuit and PT1000 platinum resistance/copper resistance sample circuit,
The serial clock input pin of conversion chip is connected with the serial clock output pin of single-chip microcomputer, and the numeral output of conversion chip is drawn
Foot is connected with the digital input pins of single-chip microcomputer, and the digital input pins of conversion chip connects with the digital output pin of single-chip microcomputer
Connecing, the output of 3K critesistor sample circuit is connected with the first simulation input pin of conversion chip, PT1000 platinum resistance/copper electricity
The output of resistance sample circuit is connected with the second simulation input pin of conversion chip；
Described 3K critesistor sample circuit includes the first high-accuracy metal platinum resistance RJM1, resistance R92 and electric capacity C94, the
One end of one high-accuracy metal platinum resistance RJM1 is connected with reference voltage REF, and the other end passes through electric capacity C94 ground connection, 3K temperature-sensitive electricity
Resistance temperature sensor is parallel on the points of common connection of the first high-accuracy metal platinum resistance RJM1 and electric capacity C94, and this is commonly connected
Point is connected with the first simulation input pin of conversion chip by resistance R92；Described PT1000 platinum resistance/copper resistance sampling electricity
Road includes the second high-accuracy metal platinum resistance RJM2, resistance R93 and electric capacity C95, the one of the second high-accuracy metal platinum resistance RJM2
End is connected with reference voltage REF, and the other end passes through electric capacity C95 ground connection, PT1000 platinum resistance temperature sensor or copper resistance temperature
Sensor parallel is on the points of common connection of the second high-accuracy metal platinum resistance RJM2 and electric capacity C95, and this points of common connection passes through
Resistance R93 is connected with the second simulation input pin of conversion chip.
Support critesistor the most according to claim 1, platinum resistance, the temperature of the mashed up measurement of copper resistance temperature sensor are adopted
Acquisition means, it is characterised in that: 3/8 described decoder uses 74HC137 chip, and the VCC energization pins of 74HC137 chip is passed through
The electric capacity C21 ground connection of series connection.
Support critesistor the most according to claim 1, platinum resistance, the temperature of the mashed up measurement of copper resistance temperature sensor are adopted
Acquisition means, it is characterised in that: described bus driver uses 74HC245 chip, and the VCC energization pins of 74HC245 chip is led to
Cross the electric capacity C31 ground connection of series connection.
Support critesistor the most according to claim 1, platinum resistance, the temperature of the mashed up measurement of copper resistance temperature sensor are adopted
Acquisition means, it is characterised in that: described photoelectric coupled device uses TLP521 chip, and the input ANO of TLP521 chip is the most logical
Crossing the first current-limiting resistance and connect positive voltage, the input CAT of TLP521 chip connects control input, the output of TLP521 chip respectively
End EMI connects the second current-limiting resistance respectively.
5. according to the support critesistor according to any one of claim 1 ~ 4, platinum resistance, the mashed up survey of copper resistance temperature sensor
The temperature collecting device of amount, it is characterised in that: described conversion chip uses AD7192 chip.
Support critesistor the most according to claim 1, platinum resistance, the temperature of the mashed up measurement of copper resistance temperature sensor are adopted
Acquisition means, it is characterised in that: the first described high-accuracy metal platinum resistance RJM1 is 1/8W-2.4K resistance, the second high-accuracy gold
Belonging to platinum resistance RJM2 is 1/8W-1.1K resistance.
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| CN201620621470.4U CN205679328U (en) | 2016-06-22 | 2016-06-22 | Support critesistor, platinum resistance, the temperature collecting device of the mashed up measurement of copper resistance temperature sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052893A (en) * | 2016-06-22 | 2016-10-26 | 中国水利水电第七工程局有限公司 | Temperature acquisition device supporting mix-matched measurement of thermistor, platinum resistor and copper resistor temperature sensors |
| TWI689712B (en) * | 2018-01-04 | 2020-04-01 | 聯發科技股份有限公司 | Thermal sensor integrated circuit and resistor used in thermal sensor |
| CN113790811A (en) * | 2021-09-03 | 2021-12-14 | 云芯智联(苏州)动力科技有限公司 | Micro-power consumption temperature sensor based on 5G network |
-
2016
- 2016-06-22 CN CN201620621470.4U patent/CN205679328U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052893A (en) * | 2016-06-22 | 2016-10-26 | 中国水利水电第七工程局有限公司 | Temperature acquisition device supporting mix-matched measurement of thermistor, platinum resistor and copper resistor temperature sensors |
| TWI689712B (en) * | 2018-01-04 | 2020-04-01 | 聯發科技股份有限公司 | Thermal sensor integrated circuit and resistor used in thermal sensor |
| US11467041B2 (en) | 2018-01-04 | 2022-10-11 | Mediatek Inc. | Thermal sensor integrated circuit, resistor used in thermal sensor and method for detecting temperature |
| CN113790811A (en) * | 2021-09-03 | 2021-12-14 | 云芯智联(苏州)动力科技有限公司 | Micro-power consumption temperature sensor based on 5G network |
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