CN102680125B - Wireless temperature sensor - Google Patents
Wireless temperature sensor Download PDFInfo
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- CN102680125B CN102680125B CN 201210122418 CN201210122418A CN102680125B CN 102680125 B CN102680125 B CN 102680125B CN 201210122418 CN201210122418 CN 201210122418 CN 201210122418 A CN201210122418 A CN 201210122418A CN 102680125 B CN102680125 B CN 102680125B
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Abstract
The invention discloses a wireless temperature sensor and aims to provide a wireless temperature sensor with a self-power generation function. The wireless temperature sensor comprises a temperature acquisition module, a microprocessor module, a wireless communication module, and a power supply module for supplying power for the whole sensor; the temperature acquisition module is electrically connected with the microprocessor module; the power supply module comprises a piezoceramic vibration power generation sheet, a current induction power generation module, a rectification circuit, an over-voltage protection circuit, a current relay capacitor, a boosting module and a power valve circuit, wherein the rectification circuit is a commutation diode; one end of the piezoceramic vibration power generation sheet is connected with the input end of the rectification circuit, and the other end is connected with the negative input end of the boosting module; the output end of the rectification circuit is connected with the positive input end of the boosting module; the current induction power generation module is connected in parallel with the piezoceramic vibration power generation sheet; and the piezoceramic vibration power generation sheet and the current induction power generation module collect energy to supply power for the whole sensor. The wireless temperature sensor is applicable to a motor temperature measuring system, cable contact temperature measuring and other environments.
Description
Technical field
The present invention relates to a kind of sensing equipment, especially relate to a kind of radio temperature sensor with spontaneous electrical function.
Background technology
At present wireless temperature measurement technology, the power supply of most thermometric product all adopts battery or CT power taking pattern.There is the problem in a serviceable life in the use of battery, use a period of time after running down of battery just need to change battery, and the leakage of battery and blast all can cause potential safety hazard.And there is the problem that volume is big, inconvenience is installed in the CT power taking, and can produce vibration and heating in ultrastrong magnetic field, and power equipment is produced serious harm.
State Intellectual Property Office of the People's Republic of China discloses Granted publication on November 05th, 2008 and number has been the patent documentation of CN201145943Y; title is temperature difference Radio infrared temperature sensor, and it is provided with semiconductor thermo-electric generation apparatus, protection thermal resistance, infrared transmitting tube and heat abstractor.Semiconductor thermo-electric generation apparatus is made up of semiconductor temperature difference module fire end heat conduction drain pan and hot-side heat dissipation copper coin, is provided with heating radiator at the heat radiation copper coin, is fastened as one by teflon insulation each other.The heating radiator top is provided with electric light conversion infrared transmitting tube.Hot protective resistance is arranged on heating radiator inside, is connected with infrared transmitting tube with the semiconductor temperature difference module.This scheme is powered by semiconductor thermo-electric generation apparatus, but power supply mode is comparatively single, is difficult to realize the purpose of self-power supply under the little environment of the temperature difference, and the scope of application has certain restriction.
Summary of the invention
The present invention mainly be solve existing in prior technology serviceable life limited, be difficult in technical matterss such as little temperature difference environmental works, provide a kind of and have than the long life, volume is little, can work, have good applicability under little temperature difference environment radio temperature sensor.
The present invention is directed to above-mentioned technical matters is mainly solved by following technical proposals: a kind of radio temperature sensor, comprise temperature collect module, microprocessor module, wireless communication module and be the supply module of whole sensor power supply, described temperature collect module is electrically connected with described microprocessor module, described supply module comprises piezoelectric ceramics vibration generating sheet, rectification circuit and boost module, one end of described piezoelectric ceramics vibration generating sheet connects the input end of rectification circuit, the other end connects the negative input of boost module, the output terminal of described rectification circuit connects the electrode input end of boost module, the cathode output end of described boost module is connected with microprocessor module with cathode output end, be connected with the 2nd NMOS pipe between described microprocessor module and the described wireless communication module, the control end of described microprocessor module connects the grid of the 2nd NMOS pipe, the drain electrode of described the 2nd NMOS pipe connects the power output end of microprocessor module, the source electrode of described the 2nd NMOS pipe connects the power input of wireless communication module, and described wireless communication module also is connected with described microprocessor module by the SPI communication bus.Radio temperature sensor of the present invention is mainly used in the motor temp measuring system, in the environment such as cable contact thermometric.
In the motor temp measuring system, owing to can produce the vibration of certain frequency in the machine operation, the present invention adopts piezoelectric ceramics vibration generating sheet, by adjusting its size and weight, make it produce the vibration frequency (resonance) that approaches with motor, send electric energy and use for whole sensor.
As preferably, described supply module also comprises the stream electric capacity that continues, and the described positive pole that continues stream electric capacity connects the electrode input end of boost module, and the described negative pole that continues stream electric capacity connects the negative input of boost module.The stream electric capacity that continues is brought together the faint electric energy of front, uses for charge pump.
As preferably, described boost module comprises bootstrap circuit boost, charge pump and super capacitor, the input end of described bootstrap circuit boost connects the positive pole of the stream electric capacity that continues, the output terminal of described bootstrap circuit boost connects the positive pole of super capacitor, the control end of described charge pump connects the control end of bootstrap circuit boost, the other end connects the negative pole of super capacitor, the cathode output end of the just very boost module of described super capacitor, as being the negative input of boost module and the cathode output end of boost module, the input end of described bootstrap circuit boost is the electrode input end of boost module to the negative pole of described super capacitor simultaneously.
As preferably, described supply module also comprises protective circuit of voltage regulation, and the positive pole of described protective circuit of voltage regulation connects the positive pole of super capacitor, and the negative pole of described protective circuit of voltage regulation connects the negative pole of super capacitor.
As preferably, described supply module also comprises power supply valve circuit, described power supply valve circuit comprises NMOS pipe and voltage checking chip, the drain electrode of a described NMOS pipe is connected with the positive pole of super capacitor, the source electrode of a described NMOS pipe is connected with the input end of microprocessor, the grid of a described NMOS pipe is connected with voltage checking chip, positive pole and the negative pole of the super capacitor that two test sides of described voltage checking chip connect respectively.Power supply valve circuit can collection of energy less than the time, system's power supply and late-class circuit are cut off fully, make the energy collection work at state more efficiently.
As preferably; described supply module also comprises overvoltage crowbar; described overvoltage crowbar comprises two interconnective unidirectional voltage stabilizing diodes of negative pole, and described overvoltage crowbar is serially connected between two output terminals of piezoelectric ceramics vibration generating sheet or coiled wire-wound coil (when supply module comprises electric current induction electricity generation module).Traditional CT power taking generally is connected in coiled wire-wound coil two with the TVS pipe and brings in and prevent owing to burn out late-class circuit protection during electric current too big (overvoltage); native system adopts two protection systems that unidirectional voltage stabilizing diode negative terminal is connected to form; with the definite value of power taking voltage clamper in system's design; can for a long time stable work, principle of work and TVS pipe are completely different.The TVS pipe can not work long hours at voltage stabilizing (puncture) state.
As preferably, described supply module also comprises electric current induction electricity generation module, and described electric current induction electricity generation module one end connects the input end of rectification circuit, and the other end connects the negative input of boost module.According to Ampere's law, the coiled wire-wound coil that electric current is responded to electricity generation module is placed on by the conductor that electric current flows through, (the design is that electric current is at least greater than 25 amperes), if lead and coiled wire-wound coil are intersected vertically, then can induce electric energy from coiled wire-wound coil, adopt special-purpose charge pump that electric energy is accumulated, use for whole temp measuring system, replaced traditional powered battery technology.Native system adopts the iron core in the thin film alloys replacement coiled wire-wound coil, utilize its distinctive magnetic characteristic, use in superpower alternating electromagnetism particular application after the match, can produce hardly because vibration, sound and the heating phenomenon that ferromagnetic vibration produces, thereby solved the heating dangerous situation after CT opens circuit in the CT power taking, the traditional silicon steel core can not or need very big power (volume) in this applications.
As preferably, described supply module also comprises the semiconductor temperature differential generating sheet, and an end of described semiconductor temperature differential generating sheet connects the electrode input end of boost module, and the other end connects the negative input of boost module.When in the power cable electric current being arranged, because the existence of the little contact resistance in contact place, the temperature at cable termination place can be higher 6～12 ℃ than the environment temperature around it, native system utilizes semiconductor temperature differential generating sheet common on the market, convert this temperature difference to electric energy, adopt special-purpose charge pump that electric energy is accumulated on capacitor, use for whole temp measuring system, replaced traditional powered battery mode.
The substantial effect that the present invention brings is, can realize the long-time running of equipment, reduced the inconvenience that maintenance brings; Strengthen the real-time of temperature measurement data, can closer detections may heat generating spot, timely feedback temperature information; Self friction and heating produce, and have reduced danger and device damage to power equipment; Need not powered battery; Have collection of energy ability efficiently, can be operated under the little temperature difference environment.
Description of drawings
Fig. 1 is a kind of circuit diagram of the present invention;
Fig. 2 is a kind of circuit diagram that comprises the electric current induction module of the present invention;
Fig. 3 is a kind of circuit diagram that comprises the semiconductor temperature differential generating sheet of the present invention;
Fig. 4 is a kind of circuit diagram that comprises electric current induction module and semiconductor temperature differential generating sheet simultaneously of the present invention.
Among the figure: 1, piezoelectric ceramics vibration generating sheet, 2, the semiconductor temperature differential generating sheet, 3, electric current induction electricity generation module; 4, bootstrap circuit boost, 5, protective circuit of voltage regulation, 6, voltage checking chip; 7, microprocessor module, 8, temperature collect module, 9, wireless communication module.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1: a kind of radio temperature sensor of present embodiment as shown in Figure 1, comprises temperature collect module 8, microprocessor module 7, wireless communication module 9 and is the supply module of whole sensor power supply.Temperature collect module 8 is electrically connected with microprocessor module 7, and supply module comprises piezoelectric ceramics vibration generating sheet 1, rectification circuit, overvoltage crowbar, continue stream capacitor C 1, boost module and power supply valve circuit, and rectification circuit is commutation diode D1.One end of piezoelectric ceramics vibration generating sheet 1 connects the input end of rectification circuit, and the other end connects the negative input of boost module, and the output terminal of rectification circuit connects the electrode input end of boost module.Be connected with the 2nd NMOS pipe T2 between microprocessor module 7 and the wireless communication module 9, the control end of microprocessor module 7 connects the grid of the 2nd NMOS pipe T2, the drain electrode of the 2nd NMOS pipe T2 connects the power output end of microprocessor module 7, the source electrode of the 2nd NMOS pipe T2 connects the power input of wireless communication module 9, and wireless communication module 9 also is connected with microprocessor module 7 by the SPI communication bus.Piezoelectric ceramics vibration generating sheet 1 is arranged on the motor, by the vibration acquisition energy of motor.
Boost module comprises bootstrap circuit boost 4; charge pump K; super capacitor C2 and protective circuit of voltage regulation 5; bootstrap circuit boost 4 is self-maintained circuits; the input end of bootstrap circuit boost 4 connects the positive pole of the stream capacitor C 1 that continues; the output terminal of bootstrap circuit boost 4 connects the positive pole of super capacitor C2; the control end of charge pump K connects the control end of bootstrap circuit boost 4; the other end connects the negative pole of super capacitor C2; the cathode output end of the just very boost module of super capacitor C2; as being the negative input of boost module and the cathode output end of boost module, the input end of bootstrap circuit boost 4 is the electrode input end of boost module to the negative pole of super capacitor C2 simultaneously.The positive pole of the stream capacitor C 1 that continues connects the electrode input end of boost module, and the negative pole of the stream electric capacity that continues connects the negative input of boost module.The positive pole of protective circuit of voltage regulation 5 connects the positive pole of super capacitor C2, and negative pole connects the negative pole of super capacitor C2.
Power supply valve circuit comprises NMOS pipe T1 and voltage checking chip 6, the drain electrode of the one NMOS pipe T1 is connected with the positive pole of super capacitor C2, the source electrode of the one NMOS pipe T1 is connected with the electrode input end of microprocessor module 7, the grid of the one NMOS pipe T1 is connected positive pole and the negative pole of the super capacitor C2 that two test sides of voltage checking chip 6 connect respectively with voltage checking chip 6.The negative input of microprocessor module 7 connects the negative pole of super capacitor C2.
Overvoltage crowbar comprises two interconnective unidirectional voltage stabilizing diode D2 of negative pole and D3, and the positive pole of single-phase voltage stabilizing diode D2 and D3 is connected two input ends of piezoelectric ceramics vibration generating sheet respectively.
Present embodiment adopts the temperature sampling chip of high precision (± 0.5 ℃), wide-range (55 ℃～+ 150 ℃), to satisfy the requirement of power industry wireless temperature measurement.
Present embodiment adopts popular in the industry super low-power consumption MCU design, and does power supply and low-power consumption management in program, only needs very little coiled wire-wound coil just can give the total system stable power-supplying.
Present embodiment adopts the high frequency radio data transmission technology, and data sink and measured point need not any physical connection, the electrical isolation safety and reliability.
Present embodiment adopts the CRC technology, and data receiver carries out CRC check to the data of receiving, further improves measuring reliability, has avoided data to misrepresent deliberately and report by mistake.
Embodiment 2: a kind of radio temperature sensor of present embodiment, as shown in Figure 2, except the structure identical with embodiment 1, also comprise an electric current induction electricity generation module 3, sheet is generated electricity in electric current induction electricity generation module 3 and piezoelectric ceramics vibration can generating in parallel, both are the radio temperature sensor power supply together, vibrate also operate as normal of little environment at some.Electric current is responded to coiled wire-wound coil in the electricity generation module 3 to be placed on by the conductor that electric current flows through, electric current and coiled wire-wound coil in the conductor are intersected vertically, then can induce electric energy from coiled wire-wound coil, adopt special-purpose charge pump that electric energy is accumulated, use for whole temp measuring system.
Embodiment 3: a kind of radio temperature sensor of present embodiment, as shown in Figure 3, except the structure identical with embodiment 1, also comprise semiconductor temperature differential generating sheet 2, one end of semiconductor temperature differential generating sheet 2 connects the electrode input end of boost module, and the other end connects the negative input of boost module.Semiconductor temperature differential generating sheet 2 is arranged on the place of bigger heating, has the environment of the equipment of big thermal value also can adopt thermo-electric generation as the power supply means at some.
Embodiment 4: a kind of radio temperature sensor of present embodiment, as shown in Figure 4, except the structure identical with embodiment 2, also comprise semiconductor temperature differential generating sheet 2, one end of semiconductor temperature differential generating sheet 2 connects the electrode input end of boost module, and the other end connects the negative input of boost module.Radio temperature sensor has thermo-electric generation, electric current induction generating and three kinds of power supply modes of vibrating power-generation simultaneously like this, go for various environment, as long as vibration is arranged or have than heavy current or have in three conditions of equipment of big thermal value any one or a plurality of, can make the present embodiment operate as normal.And, thermal value little at Oscillation Amplitude be also little environment of little, electric current also, cooperates also and can provide enough electric energy for microprocessor module and wireless communication module by the three.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Those skilled in the art can make various modifications or replenish or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as supply module, boost module morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; They are construed to any additional restriction all is contrary with spirit of the present invention.
Claims (7)
1. radio temperature sensor, comprise temperature collect module, microprocessor module, wireless communication module and be the supply module of whole sensor power supply, it is characterized in that, described temperature collect module is electrically connected with described microprocessor module, described supply module comprises piezoelectric ceramics vibration generating sheet, rectification circuit and boost module, one end of described piezoelectric ceramics vibration generating sheet connects the input end of rectification circuit, the other end connects the negative input of boost module, the output terminal of described rectification circuit connects the electrode input end of boost module, the cathode output end of described boost module is connected with microprocessor module with cathode output end, be connected with the 2nd NMOS pipe between described microprocessor module and the described wireless communication module, the control end of described microprocessor module connects the grid of the 2nd NMOS pipe, the drain electrode of described the 2nd NMOS pipe connects the power output end of microprocessor module, the source electrode of described the 2nd NMOS pipe connects the power input of wireless communication module, and described wireless communication module also is connected with described microprocessor module by the SPI communication bus; Described supply module also comprises the stream electric capacity that continues, and the described positive pole that continues stream electric capacity connects the electrode input end of boost module, and the described negative pole that continues stream electric capacity connects the negative input of boost module.
2. radio temperature sensor according to claim 1, it is characterized in that, described boost module comprises bootstrap circuit boost, charge pump and super capacitor, the input end of described bootstrap circuit boost connects the positive pole of the stream electric capacity that continues, the output terminal of described bootstrap circuit boost connects the positive pole of super capacitor, the control end of described charge pump connects the control end of bootstrap circuit boost, the other end connects the negative pole of super capacitor, the cathode output end of the just very boost module of described super capacitor, the negative pole of described super capacitor is simultaneously as the negative input of boost module and the cathode output end of boost module, and the input end of described bootstrap circuit boost is the electrode input end of boost module.
3. radio temperature sensor according to claim 2; it is characterized in that; described boost module also comprises protective circuit of voltage regulation, and the positive pole of described protective circuit of voltage regulation connects the positive pole of super capacitor, and the negative pole of described protective circuit of voltage regulation connects the negative pole of super capacitor.
4. radio temperature sensor according to claim 3, it is characterized in that, described supply module also comprises power supply valve circuit, described power supply valve circuit comprises NMOS pipe and voltage checking chip, the drain electrode of a described NMOS pipe is connected with the positive pole of super capacitor, the source electrode of a described NMOS pipe is connected with the input end of microprocessor module, the grid of a described NMOS pipe is connected with voltage checking chip, and two test sides of described voltage checking chip connect positive pole and the negative pole of super capacitor respectively.
5. radio temperature sensor according to claim 4; it is characterized in that; described supply module also comprises overvoltage crowbar; described overvoltage crowbar comprises two interconnective unidirectional voltage stabilizing diodes of negative pole, and described overvoltage crowbar is serially connected between two output terminals of piezoelectric ceramics vibration generating sheet.
6. radio temperature sensor according to claim 5 is characterized in that, described supply module also comprises electric current induction electricity generation module, and described electric current induction electricity generation module one end connects the input end of rectification circuit, and the other end connects the negative input of boost module.
7. according to claim 5 or 6 described radio temperature sensors, it is characterized in that, described supply module also comprises the semiconductor temperature differential generating sheet, and an end of described semiconductor temperature differential generating sheet connects the electrode input end of boost module, and the other end connects the negative input of boost module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109459152A (en) * | 2018-12-12 | 2019-03-12 | 杭州休普电子技术有限公司 | A kind of radio temperature sensor |
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