CN203824666U - Micro power consumption intelligent digital thermometer - Google Patents
Micro power consumption intelligent digital thermometer Download PDFInfo
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- CN203824666U CN203824666U CN201420030138.1U CN201420030138U CN203824666U CN 203824666 U CN203824666 U CN 203824666U CN 201420030138 U CN201420030138 U CN 201420030138U CN 203824666 U CN203824666 U CN 203824666U
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- power supply
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Abstract
Disclosed is a micro power consumption intelligent digital thermometer which belongs to the technical field of industrial temperature measuring equipment. The digital thermometer is characterized by including a power supply unit and a data processing unit which includes a bias sampling module, an AD conversion module, a central processing unit and a display module, wherein the bias sampling module, the AD conversion module, the central processing unit and the display module are connected to each other successively. The central processing unit of the micro power consumption intelligent digital thermometer employs a low power consumption chip and meanwhile is provided with a first power supply module and a second power supply module, wherein the first power supply module is in an intermittent working mode so that a purpose of micro power consumption of the thermometer is achieved and service life of a battery is prolonged. With the arranged bias sampling module which is connected to the AD conversion module, the AD conversion module is free of errors caused by a reference power supply during a sampling process, thereby enabling measuring precision to be higher and stability to be better. Both the AD conversion module and the central processing unit have sleeping modes so that power consumption is further reduced. The battery is used for power supplying so that inconvenience of an on-line wire arranging process is avoided.
Description
Technical field
A kind of micro-power consumption intelligent digital thermometer, belongs to industrial temperature measuring equipment field.Be specifically related to that a kind of precision is high, the digital thermometer of good stability and micro-power consumption.
Background technology
At present, in industrial thermometric field, mainly applying instrument has two classes, and a class is bimetallic system cell, and another kind of is the analogue instrument that 4 traditional～20mA exports.Bimetallic system cell has the shortcomings such as precision is low, poor stability, reading inconvenience, for the analogue instrument of traditional 4～20mA output, temperature sensor provides bias voltage by a constant current source, the pressure drop at its two ends is carried out the conditioning of signal by an instrument amplifier, this just needs expensive constant current source, multiple resistance capacitances and several operational amplifier or independently instrument amplifier, need low noise and stable system to calibrate, also need operative employee to be optimized in the time producing, this analogue measurement technical costs is high, precision is low, this type of instrument also has a shortcoming to need exactly outside that 24V direct supply is provided, be subject to a great extent the restriction of field condition.
Summary of the invention
The technical problems to be solved in the utility model is: overcome the deficiencies in the prior art, provide that a kind of micro-power consumption, precision are high, micro-power consumption intelligent digital thermometer of good stability.
The utility model solves the technical scheme that its technical matters adopts: this micro-power consumption intelligent digital thermometer, comprise: power supply unit and data processing unit, it is characterized in that: power supply unit is connected with data processing unit and is its power supply, and described data processing unit comprises successively connected biasing sampling module, AD modular converter, CPU (central processing unit) and display module.
Described power supply unit comprises power supply, the first power module and second source module, power supply is connected with the first power module and second source module simultaneously, the first power module is connected with described biasing sampling module and is its power supply, second source module is connected with described AD modular converter, CPU (central processing unit) and display module and is its power supply, and CPU (central processing unit) is connected with the first power module simultaneously.
Described biasing sampling module comprises current-limiting resistance R
x, biasing resistor R
pand temperature sensor RTD, power vd D is series limiting resistor R successively
x, biasing resistor R
pand ground connection after temperature sensor RTD, self-limiting resistance R
xwith biasing resistor R
pbetween draw the voltage V as the reference power source of AD modular converter
rEF; Self-bias resistor R
pand between temperature sensor RTD, draw the voltage V as the input positive pole of AD modular converter
iN+; The input negative pole V of AD modular converter
iN-ground connection.
Be provided be connected with described CPU (central processing unit) for the demonstration refresh module of refreshing frequency is set, described second source module with show refresh module be connected.
Described demonstration refresh module comprises resistance R 1 ~ R4 and two s' toggle switch S1, One-position switch one end of toggle switch S1 one end of parallel resistance R1 and 26 pin of CPU (central processing unit) simultaneously, and the other end is by resistance R 3 ground connection; One end of the another one switch while parallel resistance R2 of toggle switch S1 and 25 pin of CPU (central processing unit), the other end of resistance R 1 ~ R2 connects the voltage output end of second source module simultaneously.
Described power supply is battery.
The first described power module model is TC1016; Described second source module model is MCP1700; Described AD modular converter model is MCP3551.
Described CPU (central processing unit) adopts PIC18F2XK20 series monolithic.
Compared with prior art, had beneficial effect of the present utility model is:
1, the CPU (central processing unit) in a kind of micro-power consumption intelligent digital thermometer of the present utility model adopts low-power chip, be provided with the first power module and second source module simultaneously, wherein the first power module is intermittent operation mode, reach the object of the micro-power consumption of whole thermometer, improved the life-span of battery.
2, be provided with the biasing sampling module being connected with AD modular converter, AD modular converter has saved the error that reference power source brings in the time sampling, and makes measuring accuracy higher, and Simultaneous Stabilization is better.
3, can revise the demonstration refreshing frequency of display module by the toggle switch in demonstration refresh module, convenient and swift.
4, AD modular converter and CPU (central processing unit) are provided with park mode, have further reduced power consumption.
5, adopt powered battery, the inconvenience of having save field wiring is convenient to safeguard simultaneously.
Brief description of the drawings
Fig. 1 is micro-power consumption intelligent digital thermometer functional-block diagram.
Fig. 2 is micro-power consumption intelligent digital thermometer biasing sampling module schematic diagram.
Fig. 3 is the circuit theory diagrams of micro-power consumption intelligent digital thermometer.
Embodiment
Fig. 1 ~ 3rd, most preferred embodiment of the present utility model, is described further below in conjunction with 1 ~ 3 pair of the utility model of accompanying drawing.
As shown in Figure 1, the micro-power consumption intelligent digital thermometer of one of the present utility model comprises: battery, the first power module, second source module, biasing sampling module, AD modular converter, CPU (central processing unit), display module and demonstration refresh module.Battery is connected with second source module with the first power module simultaneously, the first power module is connected with biasing sampling module, second source module is connected with AD modular converter, CPU (central processing unit), display module and demonstration refresh module simultaneously, biasing sampling module, AD modular converter, CPU (central processing unit) and display module are connected successively, show that refresh module is connected with CPU (central processing unit), CPU (central processing unit) is connected with the first power module simultaneously.Temperature sensor is integrated in biasing sampling module.
Biasing sampling module connects AD modular converter provides input signal and reference voltage for AD modular converter.AD modular converter connection CPU (central processing unit) is input to CPU (central processing unit) by the data after AD conversion and processes.CPU (central processing unit) connection display module is delivered to display module by the data of handling and is shown.Show that refresh module connects CPU (central processing unit) and configures different demonstration refresh times by showing the toggle switch in refresh module.The first power module connects biasing sampling module provides stable operating voltage for it.Second source module is respectively AD modular converter, CPU (central processing unit) and display module stable operating voltage is provided.Battery connects respectively the first power module and second source module provides working power for whole circuit.In the utility model, show that the toggle switch in refresh module adopts two toggle switchs, can form 4 kinds of different permutation and combination patterns, CPU (central processing unit) is provided with 4 kinds of different demonstration refreshing frequencys by these 4 kinds different permutation and combination pattern correspondences, can arrange voluntarily as required, the inconvenience of having avoided single refreshing frequency to bring, the while can arrange the toggle switch of other figure places as required, to increase or to reduce the quantity that shows refreshing frequency.The first power module is intermittent operation mode, by CPU (central processing unit), its duty is controlled in the time that needs the first power module carries out work, CPU (central processing unit) is controlled signal by the output port being connected with the first power module to the first power module output, the first power module is started working, otherwise the first power module is in off state, thereby the power consumption that has reduced whole micro-power consumption intelligent digital thermometer, has extended service time.In the utility model, the first power module and second source module are micro-power consumption LDO chip, and wherein the model of the first power module is TC1016, and the model of second source module is MCP1700, and second source module is continuous schedule mode of operation.
As shown in Figure 2, biasing sampling module comprises current-limiting resistance R
x, biasing resistor R
pand temperature sensor RTD, power vd D is series limiting resistor R successively
x, biasing resistor R
pand ground connection after temperature sensor RTD.Self-limiting resistance R
xwith biasing resistor R
pbetween extraction voltage V
rEFbe connected with AD modular converter, as the reference power source end of AD modular converter; Self-bias resistor R
pand extraction voltage V between temperature sensor RTD
iN+be connected with AD modular converter, as the input positive pole of AD modular converter; The input negative pole V of AD modular converter
iN-ground connection.Power vd D is the output voltage of the first power module.
As shown in Figure 2, the voltage V at temperature sensor RTD two ends
rTDas shown in Equation (1):
V
RTD=V
REF(
)=V
REF(
) （1）
Wherein: V
rTDfor the voltage at temperature sensor RTD two ends, V
rEFfor the reference voltage of AD modular converter,
for the resistance value of temperature sensor RTD, R
pfor biasing resistor R
presistance value, Code is the output data of AD modular converter, n is the figure place of AD modular converter (having sign bit).
Can be drawn the resistance value R of temperature sensor RTD by formula (1)
rTD, biasing resistor R
presistance value and A/D convertor circuit output data between relation as described in formula (2):
=
(
) （2）
Can be found out the resistance value R of temperature sensor RTD by formula (2)
rTDonly with the resistance value R of biasing resistor
p, AD modular converter output data relevant, and irrelevant with the reference voltage of AD modular converter, as the resistance value R of biasing resistor
pone timing, can calculate the resistance value of temperature sensor RTD easily by the output data of AD modular converter, make to form fixing proportionate relationship between the resolution of AD modular converter and RTD temperature resolution.After CPU (central processing unit) receives the output data of AD modular converter, calculate the resistance value R of temperature sensor RTD according to the output data of AD modular converter
rTD, then obtain corresponding temperature value by tabling look-up, then temperature value is input to display module and shows.
As shown in Figure 3, the power supply V being provided by battery
cCconnect the power input terminal V of power conversion chip U3 ~ U4 simultaneously
iN.The power output end V of power conversion chip U4
oUT-the power input V of AD conversion chip U2 in parallel and LCD liquid crystal display U5 simultaneously
dDand the feeder ear of microprocessor U1: 20 pin.The DI terminal of LCD liquid crystal display U5 is connected with 12 pin with 11 pin of microprocessor U1 respectively with CLK terminal.CS terminal, the SCK terminal of AD conversion chip U2 are connected with 3 pin with 2 pin of microprocessor U1 respectively, SDO/RDY terminal is connected with 4 pin of microprocessor U1, and the CS terminal of AD conversion chip U2, SCK terminal, SDO/RDY terminal are the SPI serial bus interface of AD conversion chip U2.The power output end V-of power conversion chip U3
oUTresistance in series R successively
x, biasing resistor R
pand ground connection after temperature sensor RTD.As mentioned above, resistance R
xand resistance R
pbetween extraction voltage V
rEFv-with AD conversion chip U2
rEFterminal is connected, as the reference power source end of AD modular converter; Resistance R
pand extraction voltage V between temperature sensor RTD
iN+v with AD conversion chip U2
iN+terminal is connected, as the input positive pole of AD modular converter; The input negative pole V of AD conversion chip U2
iN-ground connection.The SHDN terminal of power conversion chip U3 is connected with 14 pin of microprocessor U1.
One end of two switches of 26 pin of microprocessor U1 in being connected respectively toggle switch S1 with 25 pin, ground connection after the other end difference resistance in series R3 ~ R4 of two switches in toggle switch S1,26 pin of microprocessor U1 and 25 pin are distinguished one end of parallel resistance R1 and resistance R 2, the other end of resistance R 1 and resistance R 2 and the power output end V of power conversion chip U4 simultaneously
oUTbe connected, resistance R 1 ~ R4 and toggle switch S1 form above-mentioned demonstration refresh module.
Power conversion chip U3 and power conversion chip U4 are respectively above-mentioned the first power module and second source module, and AD conversion chip U2 is above-mentioned AD modular converter.Microprocessor U1 is above-mentioned CPU (central processing unit), and in the utility model, microprocessor U1 adopts PIC18F2XK20 series monolithic to realize, and LCD liquid crystal display U5 is above-mentioned display module, and the model of AD modular converter is MCP3551.
Specific works process and principle are as follows: the power supply V being provided by battery
cCbe power conversion chip U3 and power conversion chip U4 power supply simultaneously, power conversion chip U3 is intermittent operation mode, sending control signal by 14 pin of microprocessor U1 to the SHDN terminal of power conversion chip U3 realizes, when microprocessor U1 detects while reaching the dormancy time presetting, 14 human hair combing wastes of microprocessor U1 go out control signal, power conversion chip is started working, its power output end V
oUToutput voltage is carried in current-limiting resistance R
x, biasing resistor R
pand temperature sensor RTD is upper, then microprocessor U1 control AD conversion chip U2 samples, and after having sampled, microprocessor U1 control power transfer module U3 quits work.Microprocessor U1 controls the data that AD conversion chip U2 obtains sampling and carries out analog to digital conversion, and after converting, AD conversion chip U2 delivers to microprocessor U1 by data and processes, and enters dormant state.The data that microprocessor U1 delivers to AD conversion chip U2 calculate the resistance value R of temperature sensor RTD after processing
rTD, and table look-up and draw temperature value, by its 11 pin and 12 pin, data are delivered to LCD liquid crystal display U5 and show.
The above, it is only preferred embodiment of the present utility model, be not the restriction of the utility model being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solutions of the utility model content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present utility model, still belong to the protection domain of technical solutions of the utility model.
Claims (7)
1. a micro-power consumption intelligent digital thermometer, comprise: power supply unit and data processing unit, it is characterized in that: power supply unit is connected with data processing unit and is its power supply, and described data processing unit comprises successively connected biasing sampling module, AD modular converter, CPU (central processing unit) and display module;
Described biasing sampling module comprises current-limiting resistance R
x, biasing resistor R
pand temperature sensor RTD, power vd D is series limiting resistor R successively
x, biasing resistor R
pand ground connection after temperature sensor RTD, self-limiting resistance R
xwith biasing resistor R
pbetween draw the voltage V as the reference power source of AD modular converter
rEF; Self-bias resistor R
pand between temperature sensor RTD, draw the voltage V as the input positive pole of AD modular converter
iN+; The input negative pole V of AD modular converter
iN-ground connection.
2. the micro-power consumption intelligent digital thermometer of one according to claim 1, it is characterized in that: described power supply unit comprises power supply, the first power module and second source module, power supply is connected with the first power module and second source module simultaneously, the first power module is connected with described biasing sampling module and is its power supply, second source module is connected with described AD modular converter, CPU (central processing unit) and display module and is its power supply, and CPU (central processing unit) is connected with the first power module simultaneously.
3. the micro-power consumption intelligent digital thermometer of one according to claim 2, is characterized in that: be provided be connected with described CPU (central processing unit) for the demonstration refresh module of refreshing frequency is set, described second source module with show refresh module be connected.
4. the micro-power consumption intelligent digital thermometer of one according to claim 3, it is characterized in that: described demonstration refresh module comprises resistance R 1 ~ R4 and two s' toggle switch S1, one end of One-position switch one end while parallel resistance R1 of toggle switch S1 and 26 pin of CPU (central processing unit), the other end is by resistance R 3 ground connection; One end of the another one switch while parallel resistance R2 of toggle switch S1 and 25 pin of CPU (central processing unit), the other end of resistance R 1 ~ R2 connects the voltage output end of second source module simultaneously.
5. the micro-power consumption intelligent digital thermometer of one according to claim 2, is characterized in that: described power supply is battery.
6. the micro-power consumption intelligent digital thermometer of one according to claim 2, is characterized in that: the first described power module model is TC1016; Described second source module model is MCP1700; Described AD modular converter model is MCP3551.
7. the micro-power consumption intelligent digital thermometer of one according to claim 2, is characterized in that: described CPU (central processing unit) adopts PIC18F2XK20 series monolithic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420030138.1U CN203824666U (en) | 2014-01-18 | 2014-01-18 | Micro power consumption intelligent digital thermometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420030138.1U CN203824666U (en) | 2014-01-18 | 2014-01-18 | Micro power consumption intelligent digital thermometer |
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| Publication Number | Publication Date |
|---|---|
| CN203824666U true CN203824666U (en) | 2014-09-10 |
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ID=51480151
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|---|---|---|---|
| CN201420030138.1U Expired - Fee Related CN203824666U (en) | 2014-01-18 | 2014-01-18 | Micro power consumption intelligent digital thermometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759850A (en) * | 2014-01-18 | 2014-04-30 | 淄博飞雁先行测控技术有限公司 | Micro-power consumption intelligent digital thermometer and temperature measurement method |
-
2014
- 2014-01-18 CN CN201420030138.1U patent/CN203824666U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759850A (en) * | 2014-01-18 | 2014-04-30 | 淄博飞雁先行测控技术有限公司 | Micro-power consumption intelligent digital thermometer and temperature measurement method |
| CN103759850B (en) * | 2014-01-18 | 2016-07-06 | 淄博飞雁先行测控技术有限公司 | A kind of Micro Energy Lose digital thermometer and thermometry |
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| 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: 20140910 Termination date: 20160118 |
|
| EXPY | Termination of patent right or utility model |