CN202599563U - Water temperature sensor adopting PWM modulation output - Google Patents
Water temperature sensor adopting PWM modulation output Download PDFInfo
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- CN202599563U CN202599563U CN 201220153072 CN201220153072U CN202599563U CN 202599563 U CN202599563 U CN 202599563U CN 201220153072 CN201220153072 CN 201220153072 CN 201220153072 U CN201220153072 U CN 201220153072U CN 202599563 U CN202599563 U CN 202599563U
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Abstract
The utility model discloses a water temperature sensor adopting PWM modulation output. The water temperature sensor comprises a housing, the head part of which is equipped with a thermo-sensitive element for sensing the water temperature. A function circuit board is arranged in the housing and is electrically connected with the thermo-sensitive element so as to process an analog temperature signal generated by the thermo-sensitive element. A plug terminal is disposed at the tail part of the housing to plug an external power source, and is electrically connected with the function circuit board. A digital processing module for processing the analog temperature signal into a PWM signal and a power management module for converting a power supply voltage of the external power source into a power supply voltage of the digital processing module are arranged on the function circuit board. The water temperature sensor of the utility model effectively reduces the power consumption, prolongs the service lifetime, achieves high anti-interference ability, supports the multi-device access mode, and is adapted to the requirement from multiple external devices collecting the temperature simultaneously.
Description
Technical field
The utility model relates to cooling-water temperature sensor, particularly a kind of cooling-water temperature sensor that adopts PWM modulation output.
Background technology
In automobile cooling system; Cooling-water temperature sensor is a very little electronic unit of this system's local temperature; But it is to measure the key link that the cooling system temperature is guaranteed engine operation; Have only temperature sensor correct indicate temperature information, just can guarantee engine operation in optimum condition, can the damage engine otherwise temperature is too high; Cross low meeting and reduce the serviceable life of engine and reduce the engine economic performance, it is significant how to guarantee that the correct stably measured of cooling-water temperature sensor ability goes out temperature to be measured.
Conventional cooling-water temperature sensor uses thermistor as temperature sensing element usually, utilizes the temperature of thermistor---and the corresponding rule of resistance, the temperature of measurement heating radiator demonstrates the radiator temperature state through instrument, and participates in regulating the duty of engine.The thermo-sensitive resistor power consumption of this routine is high, and drive current is big, because the higher general life-span of working temperature is not long; For reducing tie-in line quantity, use shell as an electrode usually, and owing to adopt the mimic channel measuring water temperature, so measurement result is subject to line length, earthing of casing corrosion or loose contact, external electromagnetic field disturbing effect; Simultaneously since mimic channel had relatively high expectations in the working point, so adopt the sensor of thermistor output not support many equipment to measure simultaneously, only can an external metering circuit; Along with the enhancing of automobile central control system ability, reach engine energy-saving is reduced discharging increasing of requiring, need convenient stable thermometry.
Summary of the invention
The utility model problem to be solved just provides a kind of cooling-water temperature sensor of the PWM of employing modulation output; Effectively reduction work power consumption improves serviceable life, and antijamming capability is strong; Support many equipment access way, can adapt to outside a plurality of equipment needs of collecting temperature simultaneously.
In order to solve the problems of the technologies described above; The utility model adopts following technical scheme: the cooling-water temperature sensor that adopts PWM modulation output; Comprise housing; The head of said housing is provided with the thermal sensing element of induction water temperature; Being provided with in the said housing is electrically connected with thermal sensing element fetches the function wiring board of handling the analog temperature signal that thermal sensing element produces; The afterbody of said housing is provided with the inserting terminal of grafting external power source, and inserting terminal is electrically connected with the function wiring board, it is characterized in that: said function wiring board is provided with the analog temperature signal Processing is become the digital signal processing module of pwm signal and the supply voltage of external power source transformed into the power management module of the supply voltage of digital signal processing module.
Further; Said digital signal processing module comprises the signal condition unit of handling the analog temperature signal that thermal sensing element records, will pass through analog temperature signal after the conditioning is converted into the waveform synthesis unit that digital temperature signal carries out data processing and produces the data acquisition unit of square-wave signal, said square-wave signal is converted into the fundamental frequency generation unit of the fundamental frequency signal that is used to generate duty ratio modulation output and fundamental frequency signal and digital temperature signal is generated pwm signal; The input end of said signal condition unit is electrically connected with thermal sensing element; The input end of said data acquisition unit is electrically connected with the output terminal of signal condition unit; The input end of said fundamental frequency generation unit is electrically connected with the output terminal of signal condition unit; The input end of said waveform synthesis unit is electrically connected with the output terminal of the output terminal of data acquisition unit and fundamental frequency generation unit, and the pwm signal that said waveform synthesis unit generates is modulated by the PWM modulating unit after the output of power supply line.
Further; Said signal condition unit is made up of signal condition element and amplifying unit; The input end of said signal condition element is electrically connected with thermal sensing element, and said signal condition element has two output terminals, and one of them output terminal is electrically connected with the input end of amplifying unit on the signal condition element; Another output terminal is electrically connected with the input end of fundamental frequency generation unit on the signal condition element, and the output terminal of said amplifying unit is electrically connected with the input end of data acquisition unit.
Further; Said data acquisition unit comprises V/F inverting element and data handling component; The input end of said V/F inverting element is electrically connected with the output terminal of signal condition unit; The output terminal of V/F inverting element is electrically connected with the input end of data handling component, and the output terminal of said data handling component is electrically connected with the input end of waveform synthesis unit.
Further, said power management module also comprises over-current protecting unit, Overvoltage protecting unit, interference protection unit and electrostatic protection unit.
Further, also be connected to energy-storage travelling wave tube on the said power management module.
Further, said thermal sensing element is fixed in the housing through heat-conducting filler.Guarantee the work of thermal sensing element normal and stable, fixing reliable.
Further, be provided with the hot filling material of resistance between said function wiring board and the thermal sensing element.The assurance function wiring board is not influenced by thermal source, can normal and stable work.
After adopting technique scheme, the utlity model has following advantage: gather out temperature information through internal circuit, and adopt PWM modulation output, can effectively reduce the work power consumption, improve serviceable life; The exclusive digital way of output has greatly strengthened antijamming capability; And support many equipment access way, to adapt to outside a plurality of equipment needs of collecting temperature simultaneously; Because mostly thermistor is the nonlinear temperature variation relation; Variation range in its high-temperature region is often narrow; Cause the high-temperature region precision of its work to reduce easily, the utility model is to its non-linear correction, guarantees to modulate the linear corresponding relation of the temperature signal of output.
Description of drawings
Below in conjunction with accompanying drawing the utility model is described further:
Fig. 1 is the structural representation of a kind of embodiment of the utility model;
Fig. 2 is the working cell block diagram of middle function wiring board embodiment illustrated in fig. 1.
Embodiment
A kind of embodiment of the utility model as illustrated in fig. 1 and 2; Adopt the cooling-water temperature sensor of PWM modulation output; Comprise housing 1; The head of said housing is provided with the thermal sensing element 2 of induction water temperature; Being provided with in the said housing is electrically connected with thermal sensing element fetches the function wiring board 3 of handling the analog temperature signal that thermal sensing element produces; The afterbody of said housing is provided with the inserting terminal 4 of grafting external power source, and inserting terminal is electrically connected through power supply line 5 with the function wiring board, and said function wiring board is provided with the analog temperature signal Processing is become the digital signal processing module 31 of pwm signal and the supply voltage of external power source transformed into the power management module 32 of the supply voltage of digital signal processing module.
In the present embodiment; Said digital signal processing module comprises the signal condition unit 33 of handling the analog temperature signal that thermal sensing element records, will pass through analog temperature signal after the conditioning is converted into the waveform synthesis unit 36 that digital temperature signal carries out data processing and produces the data acquisition unit 34 of square-wave signal, said square-wave signal is converted into the fundamental frequency generation unit 35 of the fundamental frequency signal that is used to generate duty ratio modulation output and fundamental frequency signal and digital temperature signal is generated pwm signal; The input end of said signal condition unit is electrically connected with thermal sensing element; The input end of said data acquisition unit is electrically connected with the output terminal of signal condition unit; The input end of said fundamental frequency generation unit is electrically connected with the output terminal of signal condition unit; The input end of said waveform synthesis unit is electrically connected with the output terminal of the output terminal of data acquisition unit and fundamental frequency generation unit, and the pwm signal that said waveform synthesis unit generates is modulated after the output of power supply line by PWM modulating unit 37.
Said signal condition unit is made up of signal condition element 331 and amplifying unit 332; The input end of said signal condition element is electrically connected with thermal sensing element; Said signal condition element has two output terminals; One of them output terminal is electrically connected with the input end of amplifying unit on the signal condition element, and another output terminal is electrically connected with the input end of fundamental frequency generation unit on the signal condition element, and the output terminal of said amplifying unit is electrically connected with the input end of data acquisition unit.Usually, thermal sensing element adopts conventional thermistor to get final product.The signal condition element with the analog temperature signal that thermal sensing element records carry out filtering, disappear tremble, anti-interference process; Simultaneously because conventional thermistor becomes negative temperature coefficient to change with the temperature variation resistance; And its resistance change rate is little far beyond its rate of temperature change; Simultaneously in order to reduce power consumption, also need drive current, the temperature variation signal that records of thermistor also will diminish like this; So need the temperature variation signal that thermistor is small to be enlarged into bigger voltage signal through amplifying unit, this voltage signal is similarly the analog temperature signal.
Said data acquisition unit comprises V/F inverting element 341 and data handling component 342; The input end of said V/F inverting element is electrically connected with the output terminal of signal condition unit; The output terminal of V/F inverting element is electrically connected with the input end of data handling component, and the output terminal of said data handling component is electrically connected with the input end of waveform synthesis unit.Analog temperature conversion of signals after will amplifying through the V/F inverting element is a frequency signal; Frequency signal after the conversion is delivered to data handling component carry out digitized processing; Here frequency signal is converted into digital temperature signal; And carry out data processing such as garbled data, average computing, damping here, frequency signal is converted into reliable and stable digital temperature signal.
Above-mentioned digital temperature signal generates stable square-wave signal by the reliable oscillator in the fundamental frequency generation unit; Square-wave signal is used to generate the fundamental frequency signal of duty ratio modulation output; Said fundamental frequency signal and digital temperature signal generate the pwm signal according to temperature variation through the waveform synthesis unit, and last pwm signal is modulated after the output of power supply line by PWM modulating unit 37.Can economize like this and remove other outer outer signal lines of power supply line, reduce the wiring cost, simultaneously through reducing the reliability that wiring improves temperature signal.
In the foregoing description, said power management module also comprises over-current protecting unit, Overvoltage protecting unit, interference protection unit and electrostatic protection unit.Also be connected to energy-storage travelling wave tube 321 on the said power management module.Energy-storage travelling wave tube can the utility model work is required power supply carry out of short duration energy storage, avoid PWM when modulation of short duration decompression of sensor and lost efficacy, guarantee that working sensor is stable, reliable.
In addition, said thermal sensing element is fixed in the housing through heat-conducting filler 6.Be provided with the hot filling material 7 of resistance between said function wiring board and the thermal sensing element.
Except that above-mentioned preferred embodiment; The utility model also has other embodiment; Those skilled in the art can make various changes and distortion according to the utility model, only otherwise break away from the spirit of the utility model, all should belong to the defined scope of the utility model accompanying claims.
Claims (8)
1. adopt the cooling-water temperature sensor of PWM modulation output; Comprise housing (1); The head of said housing is provided with the thermal sensing element (2) of induction water temperature; Being provided with in the said housing is electrically connected with thermal sensing element fetches the function wiring board (3) of handling the analog temperature signal that thermal sensing element produces; The afterbody of said housing is provided with the inserting terminal (4) of grafting external power source, and inserting terminal is electrically connected through power supply line (5) with the function wiring board, it is characterized in that: said function wiring board is provided with the analog temperature signal Processing is become the digital signal processing module (31) of pwm signal and the supply voltage of external power source transformed into the power management module (32) of the supply voltage of digital signal processing module.
2. the cooling-water temperature sensor of employing PWM modulation output according to claim 1; It is characterized in that: said digital signal processing module comprises the signal condition unit (33) of handling the analog temperature signal that thermal sensing element records, will pass through analog temperature signal after the conditioning is converted into the waveform synthesis unit (36) that digital temperature signal carries out data processing and produces the data acquisition unit (34) of square-wave signal, said square-wave signal is converted into the fundamental frequency generation unit (35) of the fundamental frequency signal that is used to generate duty ratio modulation output and fundamental frequency signal and digital temperature signal is generated pwm signal; The input end of said signal condition unit is electrically connected with thermal sensing element; The input end of said data acquisition unit is electrically connected with the output terminal of signal condition unit; The input end of said fundamental frequency generation unit is electrically connected with the output terminal of signal condition unit; The input end of said waveform synthesis unit is electrically connected with the output terminal of the output terminal of data acquisition unit and fundamental frequency generation unit, and the pwm signal that said waveform synthesis unit generates is modulated by PWM modulating unit (37) after the output of power supply line.
3. the cooling-water temperature sensor of employing PWM modulation output according to claim 2; It is characterized in that: said signal condition unit is made up of signal condition element (331) and amplifying unit (332); The input end of said signal condition element is electrically connected with thermal sensing element; Said signal condition element has two output terminals; One of them output terminal is electrically connected with the input end of amplifying unit on the signal condition element, and another output terminal is electrically connected with the input end of fundamental frequency generation unit on the signal condition element, and the output terminal of said amplifying unit is electrically connected with the input end of data acquisition unit.
4. the cooling-water temperature sensor of employing PWM modulation output according to claim 2; It is characterized in that: said data acquisition unit comprises V/F inverting element (341) and data handling component (342); The input end of said V/F inverting element is electrically connected with the output terminal of signal condition unit; The output terminal of V/F inverting element is electrically connected with the input end of data handling component, and the output terminal of said data handling component is electrically connected with the input end of waveform synthesis unit.
5. the cooling-water temperature sensor of employing PWM modulation output according to claim 1, it is characterized in that: said power management module also comprises over-current protecting unit, Overvoltage protecting unit, interference protection unit and electrostatic protection unit.
6. according to the cooling-water temperature sensor of claim 1 or 5 described employing PWM modulation outputs, it is characterized in that: also be connected to energy-storage travelling wave tube (321) on the said power management module.
7. the cooling-water temperature sensor of employing PWM modulation output according to claim 1, it is characterized in that: said thermal sensing element is fixed in the housing through heat-conducting filler (6).
8. according to the cooling-water temperature sensor of claim 1 or 7 described employing PWM modulation outputs, it is characterized in that: be provided with resistance hot filling material (7) between said function wiring board and the thermal sensing element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220153072 CN202599563U (en) | 2012-04-12 | 2012-04-12 | Water temperature sensor adopting PWM modulation output |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220153072 CN202599563U (en) | 2012-04-12 | 2012-04-12 | Water temperature sensor adopting PWM modulation output |
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| CN 201220153072 Expired - Fee Related CN202599563U (en) | 2012-04-12 | 2012-04-12 | Water temperature sensor adopting PWM modulation output |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106940226A (en) * | 2017-05-15 | 2017-07-11 | 上海安誉智能科技有限公司 | Temperature sensor line based on temperature element |
| CN106969850A (en) * | 2017-05-15 | 2017-07-21 | 上海安誉智能科技有限公司 | The temperature sensing cable and its application and method of temperature sensor line based on output PWM ripples |
| CN106969852A (en) * | 2017-05-15 | 2017-07-21 | 上海安誉智能科技有限公司 | Export temperature sensor line circuit structure, system for detecting temperature and its method for PWM ripples |
| CN108630076A (en) * | 2018-07-09 | 2018-10-09 | 广西南宁市晨启科技有限责任公司 | A kind of signal trains external member with control class group |
-
2012
- 2012-04-12 CN CN 201220153072 patent/CN202599563U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106940226A (en) * | 2017-05-15 | 2017-07-11 | 上海安誉智能科技有限公司 | Temperature sensor line based on temperature element |
| CN106969850A (en) * | 2017-05-15 | 2017-07-21 | 上海安誉智能科技有限公司 | The temperature sensing cable and its application and method of temperature sensor line based on output PWM ripples |
| CN106969852A (en) * | 2017-05-15 | 2017-07-21 | 上海安誉智能科技有限公司 | Export temperature sensor line circuit structure, system for detecting temperature and its method for PWM ripples |
| CN108630076A (en) * | 2018-07-09 | 2018-10-09 | 广西南宁市晨启科技有限责任公司 | A kind of signal trains external member with control class group |
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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: 20121212 Termination date: 20210412 |
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| CF01 | Termination of patent right due to non-payment of annual fee |