CN106052893B - Support thermistor, platinum resistance, the mashed up measurement of copper resistance temperature sensor temperature collecting device - Google Patents
Support thermistor, platinum resistance, the mashed up measurement of copper resistance temperature sensor temperature collecting device Download PDFInfo
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- CN106052893B CN106052893B CN201610456424.8A CN201610456424A CN106052893B CN 106052893 B CN106052893 B CN 106052893B CN 201610456424 A CN201610456424 A CN 201610456424A CN 106052893 B CN106052893 B CN 106052893B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
Abstract
The invention discloses it is a kind of support thermistor, platinum resistance, the mashed up measurement of copper resistance temperature sensor temperature collecting device, temperature sensor is connected by line concentration board channel with measurement board channel, measurement board channel is connect by A/D module with single-chip microcontroller, and the channel selecting signal output end of single-chip microcontroller is connected by channel selection circuit with measurement board channel；3/8 decoder input terminal is connected with single-chip microcontroller, output end passes through bus driver and two photoelectric coupled devices to 3/8 decoder all the way, each photoelectric coupled device is separately connected four relays, and 3/8 decoder another output end is connected with two dual four-way analog multiplexers.TLP521 band Phototube Coupling function of the present invention, increases safety, reduces circuit interference.The external current limiting safeguard resistor in photoelectric coupled device input, output end, plays the role of good current-limiting protection.Different sample circuits is designed, supports the mashed up measurement of different resistance value temperature sensors, structure is simple, and easy to use, design and cost of implementation are low.
Description
Technical field
The present invention relates to it is a kind of support thermistor, platinum resistance, the mashed up measurement of copper resistance temperature sensor temperature acquisition
Device.
Background technique
During concrete setting, generating the heat of hydration increases concrete temperature and deforms and cause crack, gives dam safety
Bring great hidden danger.Currently, the monitoring of concrete temperature mainly uses manual type: whole using artificial scene reading and interior
Reason, the monitor mode of analysis of data, so that the real-time of temperature monitoring is poor, and have human error, this human error is not only
It is related that under the pressure of the requirement of project progress surveyed concrete temperature value is deliberately artificially adjusted with monitoring personnel, and by the skill of personnel
The factors such as horizontal, the survey measurements habit of art influence, and the true situation of concrete cannot be shown, to the quality and safety belt of dam
Carry out hidden danger.
Concrete Temperature Monitor System can replace traditional artificial monitoring, realize the real time monitoring of concrete temperature, effectively
Solution personal monitoring is time-consuming and laborious, surveys reading not in time, has the problems such as blind section, human error.In order to improve data acquisition efficiency and
Cost input is reduced, realizes large-scale data acquisition, is needed using multiplexer channel sensor data acquisition plate, in acquisition data
When, a sensing data can only be once acquired, so need to design multiplexer channel cut-offs selection circuit, when acquiring data
The channel for opening selection disconnects other channels, and reselection opens next channel after the completion of acquisition, disconnects other channels, successively
Multiple sensing datas are acquired, traditional sampling system can not support the mashed up measurement of different resistance value temperature sensors.
Summary of the invention
It is logical using relay selection temperature data that it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of
Road, dual four-way analog multiplexer select support thermistor, platinum resistance, the copper resistance temperature sensor in the channel IIC
The temperature collecting device of mashed up measurement has the characteristics that low noise, low drifting.
The purpose of the present invention is achieved through the following technical solutions: supporting thermistor, platinum resistance, copper resistance temperature
The temperature collecting device of the mashed up measurement of sensor, including eight temperature sensors, line concentration board channel, measurement board channel, A/D module,
Channel selection circuit and single-chip microcontroller, eight temperature sensors are by 3K Ω thermistor temperature sensor, PT1000 platinum resistance temperature
Sensor and copper resistance temperature sensor composition, each temperature sensor pass through line concentration board channel respectively and are connected with measurement board channel,
It measures board channel to connect by A/D module and the sampled signal input of single-chip microcontroller, the channel selecting signal output end of single-chip microcontroller is logical
Channel selection circuit is crossed to be connected with measurement board channel；
The 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 terminal of 3/8 decoder are connected with single-chip microcontroller, and the one of 3/8 decoder
Road output end is separately connected four relays by bus driver and two photoelectric coupled devices, each photoelectric coupled device,
The another output end of 3/8 decoder is connected with two dual four-way analog multiplexers；
The A/D module includes that conversion chip, 3K Ω thermistor sample circuit and PT1000 platinum resistance/copper resistance are adopted
Sample circuit, the serial clock input pin of conversion chip are connected with the serial clock output pin of single-chip microcontroller, the number of conversion chip
The connection of the digital input pins of word output pin and single-chip microcontroller, the digital input pins of conversion chip and the numeral output of single-chip microcontroller
Pin connection, the output of 3K Ω thermistor sample circuit are connected with the first simulation input pin of conversion chip, PT1000 platinum
The output of resistance/copper resistance sample circuit is connected with the second simulation input pin of conversion chip；
The 3K Ω thermistor sample circuit includes the first high-accuracy metal platinum resistance RJM1, resistance R92 and capacitor
One end of C94, the first high-accuracy metal platinum resistance RJM1 are connected with reference voltage REF, and the other end is grounded by capacitor C94,3K
Ω thermistor temperature sensor is parallel on the points of common connection of the first high-accuracy metal platinum resistance RJM1 and capacitor C94, should
Points of common connection is connected by resistance R92 with the first simulation input pin of conversion chip；The PT1000 platinum resistance/copper electricity
Hindering sample circuit includes the second high-accuracy metal platinum resistance RJM2, resistance R93 and capacitor C95, the second high-accuracy metal platinum resistance
One end of RJM2 is connected with reference voltage REF, and the other end is grounded by capacitor C95, 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 capacitor C95, the public company
Contact is connected by resistance R93 with the second simulation input pin of conversion chip.
3/8 decoder uses 74HC137 chip, and the VCC energization pins of 74HC137 chip pass through concatenated capacitor
C21 ground connection.
The bus driver uses 74HC245 chip, and the VCC energization pins of 74HC245 chip pass through concatenated electricity
Hold C31 ground connection.
The photoelectric coupled device uses TLP521 chip, and the input terminal ANO of TLP521 chip passes through the first current limliting
Resistance connects positive voltage, and the input terminal CAT of TLP521 chip is separately connected control input, the output end EMI difference of TLP521 chip
Connect the second current-limiting resistance.
The conversion chip uses AD7192 chip.
The high-accuracy metal platinum resistance RJM1 of described first 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 present invention are:
1) 8 paths sensor data acquisition plates are used, when acquiring data, the channel of selection is opened, disconnects other channels,
Primary only to acquire a sensing data, reselection opens next channel after the completion of acquisition, successively acquires 8 sensor numbers
According to easy to use, reliable.
2) chip select functionality is realized using 3/8 decoder 74HC137, bus driver 74HC245 extends P0 port function
And increase driving capability.
3) TLP521 is photoelectric coupled device, has Phototube Coupling function, increases safety, reduces circuit interference,
Each TLP521 can drive 4 relays, the achievable selection to 8 channels.
4) 74HC137 external capacitor C21 can effectively filter decoupling, keep power level more stable.
5) the external current limiting safeguard resistor of photoelectric coupled device input terminal output end can play good current-limiting protection and make
With avoiding electric current is excessive from burning photoelectric coupling chip or relay.
6) different sample circuits is designed, supports the mashed up measurement of different resistance value temperature sensors, structure is simple, user
Just, design and cost of implementation are low.
7) input signal of sensor is resistance, and being converted into voltage signal could be by ADC acquisition process, in addition precisely
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, using RC filter (R92-C94, R93-C95), RC filter circuit is simple, strong interference immunity, have compared with
Good low frequency filtering performance finally accesses the input pin of A/D chip.
Detailed description of the invention
Fig. 1 is circuit block diagram of the present invention；
Fig. 2 is channel selection circuit block diagram of the present invention；
Fig. 3 is 74HC137 connection circuit diagram of the present invention；
Fig. 4 is 74HC137 truth table of the present invention；
Fig. 5 is 74HC245 connection circuit diagram of the present invention；
Fig. 6 is schematic diagram inside TLP521-4 of the present invention；
Fig. 7 is TLP521-4 connection circuit diagram of the present invention；
Fig. 8 is schematic diagram inside invention relay；
Fig. 9 is invention relay driver circuit schematic diagram；
Figure 10 is CD4052 truth table of the present invention；
Figure 11 is CD4052 connection circuit diagram of the present invention；
Figure 12 is AD7192 connection circuit diagram of the present invention；
Figure 13 is 3K Ω thermistor sample circuit schematic diagram of the present invention；
Figure 14 is PT1000 platinum resistance of the present invention/copper resistance sample circuit schematic diagram.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing, but protection scope of the present invention is not limited to
It is as described below.
The present embodiment uses 8 paths sensor data acquisition plates, when product acquires data, can only once acquire
One sensing data opens the channel of selection when acquiring data so need to design 8 paths cut-offs selection circuit, disconnects
Other channels, reselection opens next channel after the completion of acquisition, disconnects other channels, successively acquires 8 sensing datas.
It needs to use 3/8 decoder 74HC137 and makees chip select functionality use, in order to extend P0 port function and increase driving
Ability is added to 74HC245 bus driver, and to drive photoelectric coupled device TLP521, connecting relay can be completed list
Piece machine is to the selection function in channel, and circuit is with the dual four-way analog multiplexer of CD4052 to sending and receiving data, completion
Collecting work.
As shown in Figure 1, support thermistor, platinum resistance, the mashed up measurement of copper resistance temperature sensor temperature collecting device,
Including eight temperature sensors, line concentration board channel, measurement board channel, A/D module, channel selection circuit and single-chip microcontroller, eight temperature
Sensor is by several 3K Ω thermistor temperature sensors, several PT1000 platinum resistance temperature sensors and several copper resistance temperature
Sensor composition, each temperature sensor pass through line concentration board channel respectively and are connected with measurement board channel, and measurement board channel passes through AD mould
The channel selecting signal output end of the connection of the sampled signal input of block and single-chip microcontroller, single-chip microcontroller by channel selection circuit and is surveyed
Template channel is connected；Temperature sensor connects on respective channel, and single-chip microcontroller selects Measurement channel by channel selection circuit,
In the channel of selection, single-chip microcontroller reads sensor information data by iic bus, while A/D module also starts temperature collection number
According to single-chip microcontroller reads the temperature data in A/D chip by spi bus, successively acquires each channel in this way.
As shown in Fig. 2, channel selection circuit includes 3/8 decoder 74HC137, bus driver 74HC245, two photoelectricity
Coupled apparatus TLP521, eight relays and two dual four-way analog multiplexer CD4052, the input of 3/8 decoder
End is connected with single-chip microcontroller, and the output end all the way of 3/8 decoder passes through bus driver and two photoelectric coupled devices, each photoelectricity
Coupled apparatus is separately connected four relays, and the another output end of 3/8 decoder is multiple with two dual four-way Multipexers
It is connected with device.Single-chip microcontroller by the selection in achievable 8 channels of this circuit (relay for selecting temperature data channel,
CD4052 is for selecting the channel IIC).Elected device using 3/8 decoder chip 74HC137, to 74HC245 and CD4052 into
The choosing of row piece.74HC245 is bus driver, can drive TLP521 element after enabling to it.TLP521 is photoelectrical coupler
Part has Phototube Coupling function, increases safety, reduces circuit interference, and each TLP521 can drive 4 relays (can drive altogether
Move 8 relays), complete the selection to 8 channels.CD4052 is dual four-way analog multiplexer, can using two panels
8 channels are selected.
Single-chip microcontroller is divided into two parts to the acquisition of sensor: 1. read sensor information；2. temperature collection data.Sensor
Information includes: number, model.Single-chip microcontroller selectes n-th (1≤n≤8) channel for opening CD4052 chip by process control,
By IIC Double wire transmission agreement and sensor internal chip communication on this channel, the factory number and model of the sensor are read,
Single-chip microcontroller continues that process control is selected to open the n-th channel of relay later, at this time the temperature line in the channel by access A/D module into
Whether row conversion, single-chip microcontroller read temperature data by communicating with A/D module, judge 8 channels after the completion of the acquisition of the channel
Acquisition is completed, and is closed peripheral circuit if acquiring completion and is entered standby mode, is continued under acquisition if not acquiring there are also channel
One channel.
As shown in figure 3,74HC137 is the decoder that a piece of 3 line turns 8 lines, 16 pins: 1,2,3 foot A0, A1, A2 are shared
It decodes and inputs for 3 lines；4,5,6 foot LE, E1, E2 are enable end；8 foot GND；16 foot VCC power supply；This 8 pins of Y0 ~ Y7 are decoding
The decoding output of 8 line of device.The VCC energization pins of 74HC137 chip are grounded by concatenated capacitor C21, and external capacitor C21 is for filtering
Wave decoupling, keeps power level more stable.It is chip input selection foot that A0 ~ A2, which meets single-chip microcontroller P0.0 ~ P0.2, and 4 foot LE connect single-chip microcontroller
For P4.6 with to enable control 74HC137 chip, it is enabled to open that E1 ground connection, E2 connect positive voltage.In this circuit arrangement, it only uses
Y0, Y3, Y4 output port, Y0 are the enabled foot of 74HC245 chip, and Y3, Y4 are the enabled foot of two panels CD4052 chip.In the electricity
Lu Zhong can make three chips that can control next stage using only 1 74HC137.It, can about the working method of 3/8 decoder
74HC137 truth table is checked, as shown in figure 4, a certain foot electricity in the output of 8 lines can be made by enable end and the decoding input of 3 lines
Position drags down, it can be seen that, 74HC137 can be used as selector, output pin is connected to the enable end of next stage chip,
To enable the one of chip of 8 chips and make its work.
As 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 make bus extension and driving in other consumer electronics products.In this circuit, we are used for single-chip processor i/o port
Extension makes the port P0 complete more functions, while the chip drives ability is stronger, and single-chip microcontroller can be well by the chip
Drive next stage chip TLP521.In structure, the VCC energization pins of 74HC245 chip are grounded by concatenated capacitor C31, together
Sample plays the role of filtering decoupling.
TLP521 is controllable photoelectric coupled device, and the signal being widely used between all kinds of electron product circuits passes
It is defeated, by photoelectric coupling, front end is allowed to completely isolated, increase safety, reduction circuit interference is loaded and simplifies circuit design.
Fig. 6 is the inside schematic diagram of TLP521-4: when, by certain forward current, by photoelectric coupling, 15,16 feet are just between 1,2 feet
It can be connected, a TLP521-4 chip contains 4 photoelectric coupling channels.
As shown in fig. 7, TLP521 chip input terminal ANO connects positive voltage, pass through 5.1K resistance current-limiting protection；Input terminal CAT
For control input, when for high level, corresponding COL and EMI's is separated, and when low level is connected；External 10K resistance is exported to use
In current-limiting protection.By controlling the level height of CAT, cut-offfing for corresponding channel can be controlled.
This system is 8 channel acquisition systems, can acquire the data in 8 channels, and present, and the control circuit of prime is obviously
Through have the ability driving 8 channels, and this level-one we need selective relay to realize cut-offfing for this 8 channels.
Relay generally uses electromagnetic type relay, and electromagnetic type relay is generally by iron core, coil, armature, contact
Reed composition, as long as making there is electric current to flow through in coil as shown in figure 8, add certain voltage in 1 foot of coil both ends and 16 feet, 9
Foot will be connected with 13 feet, and 8 feet can also be connected simultaneously with 4 feet, work as current vanishes, and what is be connected just now will disconnect, and 11 feet with
13 feet can then be connected, and 6 feet are also switched on simultaneously with 4 feet, to achieve the purpose that conducting in circuit, cutting.
As shown in figure 9, relay drive circuit: v2+, v2- (are provided) for applied voltage by power module DY05D0505,
NTC1 is 3K Ω thermistor temp line, and RTD1 is PT1000 platinum resistance/copper resistance temperature line, and CP1 is 3K Ω thermistor temperature
Pipeline is spent, CP2 is PT1000 platinum resistance/copper resistance temperature pipeline.Diode Dk1 voltage-stabilizing protection, triode Q1 is for controlling
Relay on-off processed.Working principle: circuit passes through the output pin of cou1(chip TLP521-4) height of level, control Q1's
It cut-offs, is cut-off to indirectly control relay, when cou1 is high level, triode Q1 conducting, relay K1 starts to work, makes
It is connected between conducting, RTD1 and CP2 between NTC1 and CP1, so that the temperature line of temperature sensor is passed to A/D module.3KΩ
Thermistor and PT1000 platinum resistance/copper resistance can only select one to access circuit.
CD4052 is dual four-way analog multiplexer/demultiplexer, has Professional Association logical end, often
There are four independent input/output (0X ~ 3X, 0Y ~ 3Y) and a public input/output terminals (X, Y) for a multiplexer.
Public passage selection logical end includes two number selections input terminal (A, B) and an effective input terminal of low level (INH).
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 microcontroller P0.0 and P0.1, is used for
The wherein corresponding a certain channel of four-way is opened in selection；X, Y connects clock line (SCL2) and data line (SDA1), leads in selected
In road, the data of sensor side number board memory storage are read with IIC timing；Enable end INH connects the output pin of Y3(74HC137),
This chip is selected to make its work for piece.
A/D module is the maincenter of acquisition system, and temperature and resistance accesses A/D module, after converted, monolithic by temperature line
Machine is communicated with A/D module, reads collected temperature data.This system uses AD7192 chip, which is a ultralow
Noise, 24 ∑s of low drifting-type ADC converter have individual analog power and digital power.Analog portion must use
Accurate 5V power supply power supply, and digital power can input the free voltage within the scope of 2.7V ~ 5.25V independently of analog power, by
5V voltage is used in single-chip microcontroller, therefore DVDD must also use 5V power supply power supply.
AD acquisition is analog circuit, must separate with numerical portion, using independent power supply power supply, and separate cloth ground wire.
Stable+5V analog power voltage is provided for it used here as 78L05 voltage-stabiliser tube, and provides essence using ADR425 voltage stabilizing chip
Quasi-+5V benchmark acquires supply voltage.
AD7192 is a low noise full simulation front end for being suitble to high-accuracy measurement application, built-in low noise, 24
Position sigma-delta type analog-to-digital converter (ADC), low noise gain grade means that small signal can be directly inputted in piece.This device can match
It is set to two-pass DINSAR input or the input of four tunnel pseudo-differentials, piece internal channel serial device can be to enable multiple channels, and AD7192 is in order
Conversion is executed on each enabled channel, this can simplify the communication with device.4.92 MHz clocks may be used as ADC's in piece
Clock source, or external clock or crystal oscillator also can be used.
As shown in figure 12, A/D module includes conversion chip (AD7192), 3K Ω thermistor sample circuit and PT1000 platinum
Resistance/copper resistance sample circuit, the serial clock input pin (3 foot SCLK) of conversion chip and the serial clock of single-chip microcontroller export
Pin (ADSCK) is connected, the digital output pin (23 foot DOUT) of conversion chip and the digital input pins (ADOUT) of single-chip microcontroller
Connection, to transmit data to single-chip microcontroller；The digital input pins (24 foot DIN) and the numeral output of single-chip microcontroller of conversion chip draw
Foot (ADDIN) connection, the data transmitted to receive single-chip microcontroller.The output of 3K Ω thermistor sample circuit and conversion chip
First simulation input pin is connected, and the output of PT1000 platinum resistance/copper resistance sample circuit and the second simulation of conversion chip are defeated
Enter pin to be connected.
In programming, AD7192 is configured as binary channels bipolarity operating mode, i.e. AIN1-AIN2 is an acquisition
Channel (AIN2 ground connection, AIN1 connects 3K Ω thermistor, to acquire the input signal of 3K Ω thermistor), AIN3-AIN4 is
(AIN4 ground connection, AIN3 connects PT1000 platinum resistance/copper resistance to another acquisition channel, to acquire PT1000 platinum resistance/copper resistance
Input signal).Default acquisition is 3K Ω thermistor, if the channel does not acquire signal, ALT-CH alternate channel acquires PT1000
Platinum resistance/copper resistance input signal.
As shown in figure 13, the 3K Ω thermistor sample circuit includes the first high-accuracy metal platinum resistance RJM1, electricity
Resistance R92 and capacitor C94, the first high-accuracy metal platinum resistance RJM1(1/8W-2.4K) one end be connected with reference voltage REF, separately
One end is grounded by capacitor C94, and 3K Ω thermistor temperature sensor is parallel to the first high-accuracy metal platinum resistance RJM1 and electricity
On the points of common connection for holding C94, which is connected by resistance R92 with the first simulation input pin of conversion chip.
As shown in figure 14, PT1000 platinum resistance/copper resistance sample circuit includes the second high-accuracy metal platinum resistance
RJM2(1/8W-1.1K), one end of resistance R93 and capacitor C95, the second high-accuracy metal platinum resistance RJM2 and reference voltage REF
It is connected, the other end is grounded by capacitor C95, 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 capacitor C95, which passes through resistance R93 and conversion chip
The 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, 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
Keep input signal more stable, filters (R92-C94, R93-C95) using RC, RC filter circuit is simple, and strong interference immunity has
Preferable low frequency filtering performance, finally accesses the input pin of A/D chip.
The above is only a preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can be at this
In the text contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art institute into
Capable modifications and changes do not depart from the spirit and scope of the present invention, then all should be in the protection scope of appended claims of the present invention
It is interior.
Claims (6)
1. support thermistor, platinum resistance, the mashed up measurement of copper resistance temperature sensor temperature collecting device, it is characterised in that:
Including eight temperature sensors, line concentration board channel, measurement board channel, A/D module, channel selection circuit and single-chip microcontroller, eight temperature
Sensor is made of 3K Ω thermistor temperature sensor, PT1000 platinum resistance temperature sensor and copper resistance temperature sensor,
Each temperature sensor passes through line concentration board channel respectively and is connected with measurement board channel, and measurement board channel passes through A/D module and single-chip microcontroller
The channel selecting signal output end of sampled signal input connection, single-chip microcontroller passes through channel selection circuit and measurement board channel phase
Even；
The channel selection circuit include 3/8 decoder, bus driver, two photoelectric coupled devices, eight relays and
Two dual four-way analog multiplexers, the input terminal of 3/8 decoder are connected with single-chip microcontroller, 3/8 decoder it is defeated all the way
Outlet is separately connected four relays by bus driver and two photoelectric coupled devices, each photoelectric coupled device, and 3/8 translates
The another output end of code device is connected with two dual four-way analog multiplexers；
The A/D module includes conversion chip, 3K Ω thermistor sample circuit and PT1000 platinum resistance/copper resistance sampling electricity
Road, the serial clock input pin of conversion chip are connected with the serial clock output pin of single-chip microcontroller, and the number of conversion chip is defeated
The digital input pins of pin and single-chip microcontroller connect out, the digital input pins of conversion chip and the digital output pin of single-chip microcontroller
Connection, the output of 3K Ω thermistor sample circuit are 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；
The 3K Ω thermistor sample circuit includes the first high-accuracy metal platinum resistance RJM1, resistance R92 and capacitor C94,
One end of first high-accuracy metal platinum resistance RJM1 is connected with reference voltage REF, and the other end is grounded by capacitor C94,3K Ω heat
Quick resistance temperature sensor is parallel on the points of common connection of the first high-accuracy metal platinum resistance RJM1 and capacitor C94, this is public
Tie point is connected by resistance R92 with the first simulation input pin of conversion chip；PT1000 platinum resistance/the copper resistance is adopted
Sample circuit includes the second high-accuracy metal platinum resistance RJM2, resistance R93 and capacitor C95, the second high-accuracy metal platinum resistance RJM2
One end be connected with reference voltage REF, the other end is grounded by capacitor C95, 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 capacitor C95, the points of common connection
It is connected by resistance R93 with the second simulation input pin of conversion chip.
2. support thermistor 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 decoder uses 74HC137 chip, and the VCC energization pins of 74HC137 chip pass through
Concatenated capacitor C21 ground connection.
3. support thermistor 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 bus driver uses 74HC245 chip, and the VCC energization pins of 74HC245 chip are logical
Cross concatenated capacitor C31 ground connection.
4. support thermistor 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 photoelectric coupled device uses TLP521 chip, and the input terminal ANO of TLP521 chip is logical
It crosses the first current-limiting resistance and connects positive voltage, the input terminal CAT of TLP521 chip is separately connected control input, the output of TLP521 chip
End EMI is separately connected the second current-limiting resistance.
5. support thermistor, platinum resistance described according to claim 1 ~ any one of 4, the mashed up survey of copper resistance temperature sensor
The temperature collecting device of amount, it is characterised in that: the conversion chip uses AD7192 chip.
6. support thermistor 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 high-accuracy metal platinum resistance RJM1 of described first is 1/8W-2.4K resistance, the second high-accuracy gold
Category platinum resistance RJM2 is 1/8W-1.1K resistance.
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| CN107990994A (en) * | 2017-11-09 | 2018-05-04 | 中国科学院长春光学精密机械与物理研究所 | A kind of multichannel Pt Resistance Temperature Measuring Circuit and method |
| CN108010303B (en) * | 2017-11-29 | 2019-09-10 | 深圳市光域物联科技有限公司 | Indoor multi-sensor data transmitting device, system and method based on optic communication |
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| CN201392251Y (en) * | 2009-02-23 | 2010-01-27 | 桂林工学院 | Field bus-type input signal processing circuit for temperature measure and control module |
| CN101592527B (en) * | 2009-04-09 | 2012-02-01 | 上海微电子装备有限公司 | Multichannel temperature acquisition system |
| CN205679328U (en) * | 2016-06-22 | 2016-11-09 | 中国水利水电第七工程局有限公司 | Support critesistor, platinum resistance, the temperature collecting device of the mashed up measurement of copper resistance temperature sensor |
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