CN203811291U - High precision temperature measuring apparatus consuming low energy - Google Patents
High precision temperature measuring apparatus consuming low energy Download PDFInfo
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- CN203811291U CN203811291U CN201420198591.3U CN201420198591U CN203811291U CN 203811291 U CN203811291 U CN 203811291U CN 201420198591 U CN201420198591 U CN 201420198591U CN 203811291 U CN203811291 U CN 203811291U
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Abstract
The utility model discloses a high precision temperature measuring apparatus consuming low energy which belongs to the temperature measuring in industrial field. The apparatus comprises one-chip microcomputer, a power supply module, an AD converting module, a display module, and a temperature signal acquiring module. The temperature signal acquiring module comprises a temperature sensor and a bridge temperature compensating circuit. The output end of the temperature sensor is connected with the input end of the bridge temperature compensating circuit. The output end of the bridge temperature compensating circuit is connected with the input end of the AD converting module. The output end of the AD converting module is connected with the input end of the one-chip microcomputer. The display module is also connected with the one-chip microcomputer. The power supply module is for providing electricity to the one-chip microcomputer, the AD converting module, the temperature signal acquiring module and the display module. The measuring apparatus of the utility model is convenient to use and rapid to correspond. It also achieves high precision and consumes low energy to measure the temperature of liquid on an industrial spot.
Description
Technical field
The utility model relates to Industrial Measurement temperature technique field, more particularly, relates to a kind of high-precision low-power consumption temperature measuring equipment.
Background technology
Temperature is a kind of and physical quantity people's living environment close relation, is also a kind of important physical amount that needs measurement and control in production, scientific research, life.Suitable temperature is self-evident on the impact of industrial and agricultural production, and temperature survey is an extremely general and important thermometric project in industrial and agricultural production, modern scientific research and new and high technology performance history.Hyundai electronics detected temperatures technology is just towards high precision, low-power consumption, able to programme and digitized future development.
Through retrieval, in prior art, have and emphasize that the temperature measuring equipment of high precision, low-power consumption is open.As Chinese Patent Application No. 200920304914.1, the applying date is on June 23rd, 2009, and invention and created name is: hand-held temperature measuring device used for digital sensor.This application case discloses a kind of hand-held temperature measuring device used for digital sensor, at least comprise metering circuit, temperature sensor and display module, temperature sensor is DS18B20, DS18B20 serial data line is connected with an I/O mouth of single-chip microcomputer, single-chip microcomputer adopts low-power scm LPC764, on the I/O mouth of single-chip microcomputer, be connected with display and keyswitch, display module adopts LED charactron, and battery plus-negative plate is connected with microcontroller power supply circuit.This application case temperature detection is convenient, use powered battery can use 1 year, but in view of the development of current technology, use powered battery within 1 year, cannot reach low-power consumption requirement, and digital temperature sensor DS18B20 theoretical error within the scope of-10～+ 85 DEG C that this application case is used is ± 0.5 DEG C, accuracy of detection is not high, therefore, still needs existing temperature measuring equipment further improving aspect accuracy of detection, energy consumption.
Summary of the invention
1. the technical matters that utility model will solve
It is low that the purpose of this utility model is to overcome traditional temperature measuring equipment accuracy of detection, the deficiency that power consumption is high, a kind of high-precision low-power consumption temperature measuring equipment is provided, temperature measuring equipment of the present utility model is easy to use, reaction is quick, precision is high, low in energy consumption, mainly completes the fluid temperature of industry spot is measured.
2. technical scheme
For achieving the above object, the technical scheme that the utility model provides is:
A kind of high-precision low-power consumption temperature measuring equipment of the present utility model, comprise single-chip microcomputer, power module, AD modular converter, display module and temperature signal collection module, described temperature signal collection module comprises temperature sensor and electric bridge temperature-compensation circuit, and the output terminal of temperature sensor is connected with the input end of electric bridge temperature-compensation circuit; The output terminal of described electric bridge temperature-compensation circuit is connected with the input end of AD modular converter, the input end of the output terminal access single-chip microcomputer of this AD modular converter, and described display module is also connected with single-chip microcomputer; Described power module is for powering to single-chip microcomputer, AD modular converter, temperature signal collection module and display module.
Further, described single-chip microcomputer adopts MC9S08LL series monolithic, and described temperature sensor is PT1000 platinum resistance thermometer sensor,, and described AD modular converter is AD7799 type AD converter, described display module adopts word section-type LCD, and power module used is 3V battery.
Further, between described single-chip microcomputer and AD modular converter, carry out data transmission by spi bus.
Further, described electric bridge temperature-compensation circuit comprises zero-regulator resistor R1, fixed value resistance R2, reference resistance Ref and current-limiting resistance Ri, described zero-regulator resistor R1 and fixed value resistance R2 series connection, the other end ground connection of fixed value resistance R2; Reference resistance Ref is connected with the positive pole of described temperature sensor PT100 0 platinum resistance thermometer sensor,, the minus earth of this PT1000 platinum resistance thermometer sensor; After described zero-regulator resistor R1, the series circuit of fixed value resistance R2 are in parallel with reference resistance Ref, meet current-limiting resistance Ri, the other end of current-limiting resistance Ri is connected with power module; The homophase reference input Ref+ of described AD modular converter and anti-phase reference input Ref-get respectively the voltage at reference resistance Ref two ends, the analog input end AIN+ of this AD modular converter is connected with the positive pole of PT1000 platinum resistance thermometer sensor,, and another analog input end AIN-of AD modular converter is connected between zero-regulator resistor R1 and fixed value resistance R2.
3. beneficial effect
The technical scheme that adopts the utility model to provide, compared with existing known technology, has following beneficial effect:
(1) a kind of high-precision low-power consumption temperature measuring equipment of the present utility model, its single-chip microcomputer adopts MC9S08LL series monolithic, when temperature measuring equipment of the present utility model is during in non-working condition, this series monolithic can enter the dormant state of super low-power consumption, its power module adopts the 3V battery that rated capacity is 2000mAh, the power consumption of temperature measuring equipment is low, energy-conserving and environment-protective, and sustainable work reaches triennium;
(2) a kind of high-precision low-power consumption temperature measuring equipment of the present utility model, its temperature signal collection module combines the advantage of common electric bridge and constant current source driving circuit, reduce the impact of conductor resistance on measuring accuracy, the digital quantity of AD converter output is only relevant with reference resistance Ref with the zero degree resistance of PT1000 platinum resistance thermometer sensor,, and measuring accuracy is high.
Brief description of the drawings
Fig. 1 is the circuit block diagram of a kind of high-precision low-power consumption temperature measuring equipment of the present utility model;
Fig. 2 is the circuit connection diagram of temperature signal collection module in the utility model;
Label declaration in schematic diagram:
1, temperature signal collection module; 2, temperature sensor; 3, electric bridge temperature-compensation circuit.
Embodiment
For further understanding content of the present utility model, in conjunction with the accompanying drawings and embodiments the utility model is described in detail.
Embodiment 1
By reference to the accompanying drawings, a kind of high-precision low-power consumption temperature measuring equipment (referring to Fig. 1) of the present embodiment, comprises single-chip microcomputer, power module, AD modular converter, display module and temperature signal collection module 1.Described temperature signal collection module 1 comprises temperature sensor 2 and electric bridge temperature-compensation circuit 3, the temperature sensor 2 of the present embodiment adopts three-wire system PT1000 platinum resistance thermometer sensor,, the concrete connection layout of temperature signal collection module 1 is referring to Fig. 2, described electric bridge temperature-compensation circuit 3 comprises zero-regulator resistor R1, fixed value resistance R2, reference resistance Ref and current-limiting resistance Ri, described zero-regulator resistor R1 and fixed value resistance R2 series connection, the other end ground connection of fixed value resistance R2; Reference resistance Ref is connected with the positive pole of described temperature sensor PT100 0 platinum resistance thermometer sensor,, the minus earth of this PT1000 platinum resistance thermometer sensor; After described zero-regulator resistor R1, the series circuit of fixed value resistance R2 are in parallel with reference resistance Ref, meet current-limiting resistance Ri, the other end of current-limiting resistance Ri is connected with power module; The homophase reference input Ref+ of described AD modular converter and anti-phase reference input Ref-get respectively the voltage at reference resistance Ref two ends, the analog input end AIN+ of this AD modular converter is connected with the positive pole of PT1000 platinum resistance thermometer sensor,, and another analog input end AIN-of AD modular converter is connected between zero-regulator resistor R1 and fixed value resistance R2.
The temperature signal collection module 1 of the present embodiment design had both combined the advantage of common electric bridge and constant current source driving circuit, had overcome again both defects.Reduced the impact of conductor resistance on temperature measuring equipment measuring accuracy, the digital quantity of AD modular converter output is only relevant with reference resistance Ref with the zero degree resistance of PT1000 platinum resistance thermometer sensor.PT1000 platinum resistance thermometer sensor, temperature coefficient is TCR=3850ppm/K, and the AD modular converter of the present embodiment adopts low frequency CMOS chip AD7799 type AD converter, and AD converter AD7799 is the AD converter of a kind of 24, and its nonlinearity is 0.0015%.Above-mentioned design has ensured 0.01 DEG C of the temperature resolution of the temperature measuring equipment of the present embodiment, and precision reaches 0.02 DEG C.
The input end of the output terminal access single-chip microcomputer of AD converter AD7799, between single-chip microcomputer and AD converter AD7799, carry out data transmission by spi bus, every three seconds of AD converter AD7799 gathers the analog quantity of a temperature signal collection module 1, and carries out AD and be converted to 24 bit digital quantity.The single-chip microcomputer of the present embodiment adopts 8 super low-power consumption section-type LCD microcontroller MC9S08LL16, single-chip microcomputer MC9S08LL16 receives the temperature signal digital quantity of AD converter AD7799 input, and the temperature signal digital quantity receiving is carried out to linear compensation and conversion, draw actual temp value.Described display module adopts 4 section-type LCDs of micro-power consumption, and word section-type LCD is subject to Micro Controller Unit (MCU) driving displays temperature.The power module that the present embodiment adopts is that rated capacity is the 3V lithium-manganese dioxide battery of 2000mAh, and this power module is for powering to single-chip microcomputer, AD modular converter, temperature signal collection module and display module.
What deserves to be explained is, the each parts that use due to the present embodiment all have the small and exquisite feature of volume, single-chip microcomputer described in the present embodiment and temperature signal collection module 1 etc. can be integrated on a circuit board, make handheld thermometer, so apply to industry spot fluid temperature measure time easy to carry, simple to operate.When concrete use, three-wire system PT1000 platinum resistance thermometer sensor, is according to exterior temperature change, also respective change of its resistance, AD converter AD7799 gathers the once simulating signal after 2 compensation of electric bridge temperature-compensation circuit for every three seconds, and carry out AD and be converted to 24 bit digital quantity, AD converter AD7799 flows to single-chip microcomputer MC9S08LL16 by spi bus by the digital quantity of conversion, single-chip microcomputer MC9S08LL16 carries out linear compensation and conversion to the digital quantity receiving, and show that actual temp value rear drive word section-type LCD shows.
Single-chip microcomputer MC9S08LL16 and the AD converter AD7799 of the present embodiment are low energy-consumption electronic device, and all adopt low frequency operation mode, word section-type LCD also to adopt static demonstration, within every three seconds, refresh once.The stand-by time of temperature measuring equipment is 120S, and after 120S, single-chip microcomputer MC9S08LL16 enters the dormant state of super low-power consumption, and word section-type LCD is closed demonstration.Due to temperature measuring equipment in the time not using in dormant state, therefore, in the 3V powered battery situation that temperature measuring equipment is 2000mAh in rated capacity, sustainable work reaches triennium.
A kind of high-precision low-power consumption temperature measuring equipment described in embodiment 1, PT1000 platinum resistance thermometer sensor, coordinates the electric bridge temperature-compensation circuit 3 of autonomous Design, form temperature signal collection module 1, make the digital quantity of AD converter AD7799 output irrelevant with voltage fluctuation, improve measuring accuracy, use low-power consumption components and parts matching program that temperature measuring equipment power consumption is reduced greatly, energy-conserving and environment-protective and service time are long.
Below schematically the utility model and embodiment thereof are described, this description does not have restricted, and shown in accompanying drawing is also one of embodiment of the present utility model, and actual structure is not limited to this.So, if those of ordinary skill in the art is enlightened by it, in the situation that not departing from the utility model creation aim, without the creationary frame mode similar to this technical scheme and the embodiment of designing, all should belong to protection domain of the present utility model.
Claims (4)
1. a high-precision low-power consumption temperature measuring equipment, comprise single-chip microcomputer, power module, AD modular converter and display module, it is characterized in that: also comprise temperature signal collection module, described temperature signal collection module comprises temperature sensor and electric bridge temperature-compensation circuit, and the output terminal of temperature sensor is connected with the input end of electric bridge temperature-compensation circuit; The output terminal of described electric bridge temperature-compensation circuit is connected with the input end of AD modular converter, the input end of the output terminal access single-chip microcomputer of this AD modular converter, and described display module is also connected with single-chip microcomputer; Described power module is for powering to single-chip microcomputer, AD modular converter, temperature signal collection module and display module.
2. a kind of high-precision low-power consumption temperature measuring equipment according to claim 1, it is characterized in that: described single-chip microcomputer adopts MC9S08LL series monolithic, described temperature sensor is PT1000 platinum resistance thermometer sensor,, described AD modular converter is AD7799 type AD converter, described display module adopts word section-type LCD, and power module used is 3V battery.
3. a kind of high-precision low-power consumption temperature measuring equipment according to claim 2, is characterized in that: between described single-chip microcomputer and AD modular converter, carry out data transmission by spi bus.
4. according to a kind of high-precision low-power consumption temperature measuring equipment described in claim 2 or 3, it is characterized in that: described electric bridge temperature-compensation circuit comprises zero-regulator resistor R1, fixed value resistance R2, reference resistance Ref and current-limiting resistance Ri, described zero-regulator resistor R1 and fixed value resistance R2 series connection, the other end ground connection of fixed value resistance R2; Reference resistance Ref is connected with the positive pole of described temperature sensor PT100 0 platinum resistance thermometer sensor,, the minus earth of this PT1000 platinum resistance thermometer sensor; After described zero-regulator resistor R1, the series circuit of fixed value resistance R2 are in parallel with reference resistance Ref, meet current-limiting resistance Ri, the other end of current-limiting resistance Ri is connected with power module; The homophase reference input Ref+ of described AD modular converter and anti-phase reference input Ref-get respectively the voltage at reference resistance Ref two ends, the analog input end AIN+ of this AD modular converter is connected with the positive pole of PT1000 platinum resistance thermometer sensor,, and another analog input end AIN-of AD modular converter is connected between zero-regulator resistor R1 and fixed value resistance R2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420198591.3U CN203811291U (en) | 2014-04-22 | 2014-04-22 | High precision temperature measuring apparatus consuming low energy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420198591.3U CN203811291U (en) | 2014-04-22 | 2014-04-22 | High precision temperature measuring apparatus consuming low energy |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897966A (en) * | 2015-05-18 | 2015-09-09 | 湖北丹瑞新材料科技有限公司 | Detecting system of zero resistance value of platinum resistor of nitrogen-oxygen sensor chip and method |
| CN105424212A (en) * | 2015-12-27 | 2016-03-23 | 哈尔滨米米米业科技有限公司 | High-precision temperature measurement system based on resistance value comparison method |
| CN108303187A (en) * | 2018-02-08 | 2018-07-20 | 西安兴硕电子科技有限公司 | A kind of rotary body temp measuring system of wireless signal transmission |
| CN109547022A (en) * | 2018-10-31 | 2019-03-29 | 杭州领乘信息技术有限公司 | A kind of acquisition range is wide and temperature collection circuit with high accuracy and method |
-
2014
- 2014-04-22 CN CN201420198591.3U patent/CN203811291U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897966A (en) * | 2015-05-18 | 2015-09-09 | 湖北丹瑞新材料科技有限公司 | Detecting system of zero resistance value of platinum resistor of nitrogen-oxygen sensor chip and method |
| CN104897966B (en) * | 2015-05-18 | 2017-09-01 | 湖北丹瑞新材料科技有限公司 | A kind of nitrogen oxide sensor chip RTD zero degree resistance detecting system and method |
| CN105424212A (en) * | 2015-12-27 | 2016-03-23 | 哈尔滨米米米业科技有限公司 | High-precision temperature measurement system based on resistance value comparison method |
| CN108303187A (en) * | 2018-02-08 | 2018-07-20 | 西安兴硕电子科技有限公司 | A kind of rotary body temp measuring system of wireless signal transmission |
| CN109547022A (en) * | 2018-10-31 | 2019-03-29 | 杭州领乘信息技术有限公司 | A kind of acquisition range is wide and temperature collection circuit with high accuracy and method |
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| 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: 20140903 Termination date: 20150422 |
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| EXPY | Termination of patent right or utility model |