CN103017913A - Double-power sensor device mainly powered by means of self energy collection - Google Patents

Double-power sensor device mainly powered by means of self energy collection Download PDF

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Publication number
CN103017913A
CN103017913A CN2012103507856A CN201210350785A CN103017913A CN 103017913 A CN103017913 A CN 103017913A CN 2012103507856 A CN2012103507856 A CN 2012103507856A CN 201210350785 A CN201210350785 A CN 201210350785A CN 103017913 A CN103017913 A CN 103017913A
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China
Prior art keywords
power supply
temperature
power
pcb assembly
certainly
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Pending
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CN2012103507856A
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Chinese (zh)
Inventor
杨志强
汪俊
安羽
田斌
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YADO MONITORING TECHNOLOGY Co Ltd
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YADO MONITORING TECHNOLOGY Co Ltd
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Priority to CN2012103507856A priority Critical patent/CN103017913A/en
Publication of CN103017913A publication Critical patent/CN103017913A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a double-power sensor device mainly powered by means of self energy collection. The sensor device comprises a shell attached on a measured device, wherein a PCB (Printed Circuit Board) component is arranged inside the shell; a temperature measuring sensor for measuring the temperature of the measured device is arranged on the PCB component; the PCB component further comprises a semiconductor thermoelectric generator for providing a first power supply to the temperature measuring sensor, a battery for providing a second power supply to the temperature measuring sensor, and a switching circuit for switching between the first power supply and the second power supply. The first power supply is switched under the condition that the temperature difference satisfies operational needs to cause the sensor device to be powered by means of self energy collection by the semiconductor thermoelectric generator, the second power supply, namely, the battery, is switched to supply power when the temperature difference cannot satisfy the operational needs, and therefore, continuous power supply of the temperature measuring sensor under different conditions can be realized.

Description

Certainly to adopt the dual power supply sensor device that to power as main
Technical field
The present invention relates to a kind of certainly to adopt the dual power supply sensor device that to power as main.
Background technology
The technology of Internet of things concept is extensively admitted, but the bottleneck that Internet of Things is used is the obtain manner of working sensor electric energy, and to the dependence of battery, battery can 10 years under discontinuous duty in theory, but in fact be subjected to various factors, such as environment temperature, payload, cause greatly shorten actual life.Along with the development of communication and application of net is popularized, application sensors is more and more under the various environment of all trades and professions, and this is so that various technical scheme of adopting on the spot the energy sensor becomes focus.
In existing radio sensing network, the sensor node major part makes battery-powered mode.The commercial general 2-5 of battery life needs periodic replacement or maintenance at present, has increased the maintenance cost of sensor node.At present, the energy supplying system of a lot of low-power wireless sensors and controller just progressively turns to and adopts the alternative energy as main or auxiliary energy-provision way; Optimal node energy-provision way is: exempting the needs of setting up cable power or battery fully, utilize physical power source to produce the applicable power supply that the electric energy conversion is becoming many applications, also is the direction of seeking of wireless senser energy-provision way certainly.
Obtaining environmental energy and replenish the energy or even permanent power supply to node, is a kind of important energy source of sensor network nodes.The solution of commercially feasible under present processes mainly contains sun power, wind energy etc., in addition, the novel environmental energy such as energy of vibration, circumstance of temperature difference, morning and evening tides, raindrop kinetic energy also are in the research, and used at some special occasions, yet these energy resource supply modes often are subject to the restriction of surrounding environment, thereby can not guarantee continuous power supply.Because numerous wireless sensers, remote monitor and other low power applications equipment develop into nearly " zero " power device that only uses harvest energy just gradually, be that the wireless sensor node power supply becomes possibility in conjunction with existing environment for use (monitoring heating electric connecting point temperature) a kind of thermoelectric energy collection system of exploitation therefore.Temperature difference powered sensor of the prior art mainly refers to Semiconductor Thermoelectric Generator, it is that employing single power supply mode is the temperature probe power supply, the situation that can't satisfy need of work when the temperature difference then can't work, the energy acquisition that can not judge temperature probe in the situation that temperature probe can't be worked in addition partly breaks down or tcp data segment breaks down, can't realize the continuous power supply of temperature probe, this is defective of the prior art.
Summary of the invention
Technical matters to be solved by this invention is to overcome the deficiencies in the prior art, provide a kind of certainly to adopt the dual power supply sensor device that to power as main, it satisfies in the temperature difference in the situation of need of work and can power as main from adopting take Semiconductor Thermoelectric Generator, can't satisfy in the situation of need of work switching to powered battery in the temperature difference, realize the continuous power supply of temperature probe.
The technical solution adopted in the present invention is: the present invention relates to certainly to adopt the dual power supply sensor device that can power as main, comprise the housing that is attached on the equipment under test, be provided with the temperature probe that has on PCB assembly and the described PCB assembly for measuring this equipment under test temperature in this housing, described PCB assembly also comprises:
For described temperature probe provides the Semiconductor Thermoelectric Generator of the first power supply, this Semiconductor Thermoelectric Generator has a cold junction and a hot junction, this hot junction directly with the conduction of described equipment under test heat so that the temperature in hot junction equals the temperature of equipment under test;
The battery of second source is provided for described temperature probe; And
One switches circuit, is used for switching the first power supply and second source; When the temperature difference is lower than certain definite value between described cold junction and the hot junction, switch to second source, when the temperature difference between described cold junction and the hot junction switches to the first power supply when this definite value is above.
Specifically, described temperature probe comprises the first temperature element and the second temperature element, and the temperature-sensitive face of this first temperature element contacts with the temperature-sensitive face in described hot junction, and the temperature-sensitive face of this second temperature element contacts with the temperature-sensitive face of described cold junction.The temperature that this first temperature element records is the temperature of the equipment under test of required measurement, and the data of this temperature can gather in the monitoring system by wireless sending to.
Further, also be provided with heating radiator on the described PCB assembly, this heating radiator contacts with described cold junction, and the heat of cold junction to extraneous, makes itself and hot junction form certain temperature difference by heat sink radiates.
Further, the mode that is attached on the equipment under test of described housing comprises: be installed on the equipment under test by cluster; Perhaps the mounting bracket by a highly heat-conductive material is fixed on the equipment under test, and described hot junction contacts with this mounting bracket.
Further, be connected by the pair of metal bolt and nut component between the earthing pole of described PCB assembly and the mounting bracket, as the earth polar, by the high conductivity of metal bolts nut assembly, make the earthing pole good earth of PCB assembly with mounting bracket and equipment under test.
Further, described PCB assembly also comprises wireless transmission antenna, can be used for the temperature data that externally emission records, and is provided with the protective cover suitable with this wireless transmission antenna shape at described housing.
Further, be provided with an embedding mouth that is used for the whole embedding of PCB assembly of inside at described housing, be covered with tarpaulin on this embedding mouth.
Further; also be provided with the working power switch on the described PCB assembly; have a switch protection cover that extends to enclosure interior on the described housing and by embedding, when unnecessary, can close like this working power switch of this device to prevent this working power switch, in order to avoid cause unnecessary waste.
Further, above-mentioned commutation circuit mainly comprises following element:
One comparer is used for judging whether the magnitude of voltage of the power supply storage capacitor of described Semiconductor Thermoelectric Generator surpasses the upper limit threshold values of comparer;
One low pressure difference linear voltage regulator that enables of band also is connected with the IO mouth, is used for closing the power supply with the conducting semiconductor thermoelectric power generation device;
One enhancement mode field effect transistor is used for closing the power supply with turn-on battery; And
Two technotrons are respectively applied to stop electric current to pour in down a chimney to battery and low pressure difference linear voltage regulator.
Further, the circuit of described PCB assembly also includes collection of energy circuit, analog to digital converter, microcontroller and wireless transmission/receiver.
The invention has the beneficial effects as follows: because the present invention is as main power source with Semiconductor Thermoelectric Generator, with the sensor device of battery as second source, wherein to adopt can be that a kind of novel certainly adopting can technology to semiconductor temperature difference, it had both had noiselessness, pollution-free, wide accommodation, safe and reliable, the long-term advantage such as non-maintaining, can utilize temperature difference work to supply temperature probe work with the output electric energy in the place that thermal source is arranged, also can activate carry battery operated by automaticallying switch without the place, heat source.Parts of the present invention are few and all concentrate on enclosure interior in addition, and simple and compact for structure, volume is little, and whole device can be by mounting bracket or directly binding is fixing, installation and very convenient to carry.This device has wide prospect of the application in the monitoring field in sum.
Description of drawings
Fig. 1 is the inner structure synoptic diagram of sensor device of the present invention;
Fig. 2 is the synoptic diagram that the back of sensor device of the present invention is provided with mounting bracket;
Fig. 3 is the sectional drawing of sensor device of the present invention;
Fig. 4 is the module frame chart of PCB assembly circuit system among the present invention;
Fig. 5 is the synoptic diagram of the booster circuit after the commutation circuit that relates among the present invention and the Semiconductor Thermoelectric Generator output.
Embodiment
The sensor device that the present invention relates to comprises the housing that is attached on the equipment under test, be provided with the temperature probe that has on PCB assembly and the described PCB assembly for measuring this equipment under test temperature in this housing, the dual power supply of described PCB assembly is respectively described temperature probe and the Semiconductor Thermoelectric Generator of the first power supply is provided and provides the battery of second source and the commutation circuit that is used for switching the first power supply and second source for described temperature probe.The mode that this sensor device is attached on the equipment under test can have a variety of according to concrete environment for use, for example be installed on the equipment under test by cluster, perhaps the mounting bracket by a highly heat-conductive material is fixed on the equipment under test, below the mode of just installing with support the present invention is done further detailed description:
As depicted in figs. 1 and 2, mounting bracket 4 is comprised of the high-thermal conductive metal material, sensor device of the present invention is installed on the equipment under test by mounting bracket 4 set mounting hole 4b, thereby draws the temperature of equipment under test, also is the source as the sensor device heat; Be provided with a groove 4a in mounting bracket 4 other ends, the end face 5b1 of the hot junction 5b of Semiconductor Thermoelectric Generator 5 places in the groove 4a, for the hot junction 5b of Semiconductor Thermoelectric Generator 5 provides thermal source; Because Semiconductor Thermoelectric Generator 5 itself has certain coefficient of heat conductivity, so its cold junction 5a can not arrange heating radiator under some simple service condition, present embodiment is then for arranging the situation of heating radiator, be fixed on the PCB assembly 3 such as the heating radiator 1 among Fig. 1, its planar ends 1a directly contacts with the end face 5a1 of the cold junction 5a of Semiconductor Thermoelectric Generator 5, and the cold junction 5a that act as to Semiconductor Thermoelectric Generator 5 provides heat radiation.Semiconductor Thermoelectric Generator 5 is electric energy by the temperature difference of hot junction 5b and cold junction 5a with thermal power transfer, for temperature probe and other circuit downstream provide power supply.PCB assembly 3 is provided with the second temperature element 6a, and the temperature-sensitive face 6a1 of the second temperature element 6a contacts fully with the temperature-sensitive face 5a2 of Semiconductor Thermoelectric Generator 5 cold junction 5a, is used for measuring in real time the temperature of cold junction 5a.PCB assembly 3 is provided with the first temperature element 6b in addition, the temperature-sensitive face 6b1 of the first temperature element 6b contacts fully with the temperature-sensitive face 5b2 of Semiconductor Thermoelectric Generator 5 hot junction 5b, being used for the temperature that Real-time Measuring measures hot junction 5b, also is the temperature of the required measurement point of equipment under test simultaneously.
In PCB assembly 3, be provided with battery, as second source auxiliary among the present invention, the lithium battery 3a among Fig. 1 for example, as above-mentioned Semiconductor Thermoelectric Generator 5 hot junction 5b and the cold junction 5a temperature difference is lower than certain definite value or during without the temperature difference, lithium battery 3a will be by above-mentioned commutation circuit automatic activation, power supply is provided for the first temperature element 6b and the second temperature element 6a, thereby the temperature that also can measure the required measurement point of equipment under test is the temperature of the first temperature element 6b; When the hot junction of Semiconductor Thermoelectric Generator 5 5b and cold junction 5a temperature difference meet or exceed this definite value, thereby Semiconductor Thermoelectric Generator 5 also can be provided the thermometric power supply by automatic activation.Be appreciated that thus temperature probe is automatically to change power supply by Semiconductor Thermoelectric Generator 5 with lithium battery 3a.
Housing among the present invention is to be assemblied by main casing 2 and bonnet 8, and PCB assembly 3 is contained in wherein.Be provided with a cushion block 7 between heating radiator 1 and PCB assembly 3, height is identical with the height of the cold junction 5a of Semiconductor Thermoelectric Generator 5, also contacts fully with the cold junction 5a end face 5a1 balance of Semiconductor Thermoelectric Generator 5 when being used for heating radiator 1 installation; Bonnet 8 is provided with one group of boss 8a, and height is identical with the height of the outstanding bonnet 8 of the hot junction 5b of Semiconductor Thermoelectric Generator 5 institute, and effect is that to make mounting bracket 4 and the end face 5b1 of hot junction 5b keep balance also to contact abundant.Bonnet 8 is provided with a resigning hole 8b in addition, act as to the first temperature element 6b to step down and fixing.
Be provided with wireless transmission antenna 3b in PCB assembly 3, main casing 2 is provided with the protective cover 2b of skim, does not affect its wireless transmit for the protection of wireless transmission antenna 3b.Be provided with in addition paster nut 3d in the PCB assembly 3, paster nut 3d is welded in the earthing pole of PCB assembly 3, mounting bracket 4 contacts fixing and as the earth polar with equipment under test, bolt or screw 10 are put mounting bracket 4 by lock and are connected with paster nut 3d, above-mentioned paster nut 3d and bolt or screw 10 all are metallic conductions, like this so that the earthing pole of PCB assembly 3 can effective ground connection.
Such as Fig. 1 and Fig. 3, on main casing 2, also be provided with an embedding mouth 2a, be used for the 3 whole embeddings of PCB assembly, after embedding is finished, cover embedding mouth 2a with tarpaulin 9, act as water proof and dust proof and keep overall appearance.Be provided with another group switch protection cover 2c and extend to enclosure interior at main casing 2; be provided with total working power switch 3c in the PCB assembly 3; when embedding switch protection cover 2c Protection power switch 3c can be by embedding on; thereby can effectively control the power supply of this device, make it when not working, cause unnecessary waste.
As shown in Figure 4, the system module circuit block diagram of PCB assembly comprises the thermoelectric generator (hereinafter referred TEG) that is connected on certain pyrotoxin, i.e. foregoing Semiconductor Thermoelectric Generator 5.When there was the temperature difference at the two ends of thermoelectric generator, it can be converted to electric energy with the very little temperature difference, and the electric energy of generation all can be changed and is changed by a collection of energy circuit subsequently and be a kind of available form, is used for powering to circuit downstream.These downstream electronic circuits will comprise the microcontroller of temperature probe, analog to digital converter and a ultra low power usually, said modules can be obtained the energy (nowadays the form with electric current exists) of this collection and wake temperature probe up, to obtain a reading or measurement result, these data can be transmitted by the wireless transmission/receiver of a ultra low power, namely by the wireless transmission antenna 3b shown in Fig. 1 the temperature data emission that records is transferred to monitoring system.
As shown in Figure 5, the booster circuit after the TEG output uses typical flyback converter, for the open-circuit voltage of measuring TEG disconnects the rear end load with Q2, controls Q2 by the IO mouth.Because the subsequent process circuit of microprocessor (single-chip microcomputer) and temperature probe etc. can be prior art, elaborate in this not concrete diagram; For example the circuit of temperature probe can use PT100 (the first temperature element) to measure the temperature in hot junction, follow-up signal amplification circuit can use the amplifier OPA333 of zero shift, the electric bridge power supply of PT100 is provided by the AD reference voltage of single-chip microcomputer, guaranteed the precision of follow-up computing, the power supply of OPA333 is by the IO mouth control of single-chip microcomputer in addition, the power supply of metering circuit all can be turn-offed, and has guaranteed the low-power consumption of whole circuit.Can use in addition paster thermometric IC(the second temperature element) measure the temperature of huyashi-chuuka (cold chinese-style noodles), IC is by IO confession electricity, and the power supply of metering circuit all can be turn-offed, and has guaranteed the low-power consumption of whole circuit.
In the dotted line shown in Fig. 5 is commutation circuit of the present invention, it comprises two technotrons (being called for short JFET), an enhancement mode field effect transistor (being called for short PMOS), the low pressure difference linear voltage regulator (being called for short LD0) that band enables, a band interrupt function IO mouth and a comparer.Its course of work is as follows:
When TEG power supply storage capacitor magnitude of voltage surpasses the upper limit threshold values of comparer (temperature difference between cold junction and the hot junction is when predetermined value is above), comparer output high level, the LDO conducting that band enables, output 2.4V power supply is supplied with subsequent conditioning circuit and is used, turn-off simultaneously Q3(PMOS) disconnect battery A1 power supply, the IO mouth that connects LDO this moment sets high the notice single-chip microcomputer and is now the TEG power supply.The electric current of LDO can not pour in down a chimney to battery A1 when the simultaneously use of technotron Q5 had stoped the TEG power supply, had guaranteed the low-power consumption of whole circuit, can not reduce in addition the output voltage of battery A1 yet.When TEG power supply storage capacitor magnitude of voltage is lower than the lower limit threshold values of comparer (temperature difference between cold junction and the hot junction less than this predetermined value time), the comparer output low level, turn-off LDO, the subsequent conditioning circuit power supply stops, Q3 (PMOS) conducting this moment, circuit switches to by battery A1 and powers, the IO mouth that connects LDO sets low the notice single-chip microcomputer and is now powered battery, electric current was filled with to LDO when the use of same technotron Q6 had stoped battery A1 power supply, guarantee the low-power consumption of whole circuit, also can not reduce in addition the output voltage of LDO.

Claims (10)

1. one kind certainly to adopt the dual power supply sensor device that can power as main, comprise the housing that is attached on the equipment under test, be provided with the temperature probe that has on PCB assembly and the described PCB assembly for measuring this equipment under test temperature in this housing, it is characterized in that described PCB assembly also comprises:
For described temperature probe provides the Semiconductor Thermoelectric Generator of the first power supply, this Semiconductor Thermoelectric Generator has a cold junction and a hot junction, this hot junction directly with the conduction of described equipment under test heat so that the temperature in hot junction equals the temperature of equipment under test;
The battery of second source is provided for described temperature probe; And
One switches circuit, is used for switching the first power supply and second source; When the temperature difference is lower than certain definite value between described cold junction and the hot junction, switch to second source, when the temperature difference between described cold junction and the hot junction switches to the first power supply when this definite value is above.
2. according to claim 1 certainly to adopt the dual power supply sensor device that to power as main, it is characterized in that, described temperature probe comprises the first temperature element and the second temperature element, the temperature-sensitive face of this first temperature element contacts with the temperature-sensitive face in described hot junction, and the temperature-sensitive face of this second temperature element contacts with the temperature-sensitive face of described cold junction.
3. according to claim 1 certainly to adopt the dual power supply sensor device that can power as main, it is characterized in that also be provided with heating radiator on the described PCB assembly, this heating radiator contacts with described cold junction.
4. according to claim 1 and 2 or 3 described certainly to adopt the dual power supply sensor device that to power as main, it is characterized in that the mode that described housing is attached on the equipment under test comprises: be installed on the equipment under test by cluster; Perhaps the mounting bracket by a highly heat-conductive material is fixed on the equipment under test, and described hot junction contacts with this mounting bracket.
5. according to claim 4ly it is characterized in that certainly to adopt the dual power supply sensor device that to power as main, be connected by the pair of metal bolt and nut component between the earthing pole of described PCB assembly and the mounting bracket.
6. according to claim 1 and 2 or 3 described certainly to adopt the dual power supply sensor device that to power as main, it is characterized in that described PCB assembly also comprises wireless transmission antenna, is provided with the protective cover suitable with this wireless transmission antenna shape at described housing.
7. according to claim 1 and 2 or 3 describedly it is characterized in that certainly to adopt the dual power supply sensor device that to power as main, be provided with an embedding mouth that is used for the whole embedding of PCB assembly of inside at described housing, be covered with tarpaulin on this embedding mouth.
8. according to claim 7 certainly to adopt the dual power supply sensor device that to power as main; it is characterized in that; also be provided with the working power switch on the described PCB assembly, have a switch protection cover that extends to enclosure interior on the described housing to prevent that this working power switch is by embedding.
9. according to claim 1 and 2 or 3 described certainly to adopt the dual power supply sensor device that can power as main, it is characterized in that described commutation circuit comprises:
One comparer is used for judging whether the magnitude of voltage of the power supply storage capacitor of described Semiconductor Thermoelectric Generator surpasses the upper limit threshold values of comparer;
One low pressure difference linear voltage regulator that enables of band also is connected with the IO mouth, is used for closing the power supply with the conducting semiconductor thermoelectric power generation device;
One enhancement mode field effect transistor is used for closing the power supply with turn-on battery; And
Two technotrons are respectively applied to stop electric current to pour in down a chimney to battery and low pressure difference linear voltage regulator.
10. according to claim 1 and 2 or 3 described certainly to adopt the dual power supply sensor device that to power as main, it is characterized in that the circuit of described PCB assembly also includes collection of energy circuit, analog to digital converter, microcontroller and wireless transmission/receiver.
CN2012103507856A 2012-09-19 2012-09-19 Double-power sensor device mainly powered by means of self energy collection Pending CN103017913A (en)

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CN103617711A (en) * 2013-12-04 2014-03-05 上海华冠电子设备有限责任公司 Wireless data acquisition device utilizing energy harvesting technology
CN104917274A (en) * 2014-03-10 2015-09-16 施耐德电器工业公司 Power supply device and method for wireless sensor unit
CN105067131A (en) * 2015-06-30 2015-11-18 成都众山科技有限公司 Wireless temperature transmitter with hybrid power supply
CN105452827A (en) * 2013-07-01 2016-03-30 株式会社村田制作所 Temperature detection device
CN105474744A (en) * 2013-08-14 2016-04-06 科模热思股份有限公司 Powering sensors in heat trace system
CN105471062A (en) * 2016-01-04 2016-04-06 中冶长天国际工程有限责任公司 Power supply system and method for temperature measurement device of rotary kiln
CN105890786A (en) * 2016-04-09 2016-08-24 安徽大学 Intelligent cable joint system
CN106549475A (en) * 2015-09-21 2017-03-29 卡孚特能源技术(深圳)有限公司 A kind of wireless senser power supply unit based on semi-conductor thermo-electric generation module
CN107515040A (en) * 2017-07-18 2017-12-26 杨志强 It is a kind of based on solar powered vibration sensor
CN108225607A (en) * 2017-11-16 2018-06-29 珠海多监测科技有限公司 Wireless temperature measure module built in a kind of charging connector for electric automobile
CN109067251A (en) * 2018-09-14 2018-12-21 国网黑龙江省电力有限公司电力科学研究院 A kind of low temperature environment route on-Line Monitor Device thermal electric generator

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CN105452827A (en) * 2013-07-01 2016-03-30 株式会社村田制作所 Temperature detection device
CN105474744A (en) * 2013-08-14 2016-04-06 科模热思股份有限公司 Powering sensors in heat trace system
CN105474744B (en) * 2013-08-14 2017-03-01 科模热思股份有限公司 Powered sensor in hot tracking system
CN103617711B (en) * 2013-12-04 2016-10-05 上海华冠电子设备有限责任公司 A kind of wireless data acquisition device utilizing energy collection technology
CN103617711A (en) * 2013-12-04 2014-03-05 上海华冠电子设备有限责任公司 Wireless data acquisition device utilizing energy harvesting technology
CN104917274B (en) * 2014-03-10 2019-04-30 施耐德电器工业公司 Improved power-supply device and method for wireless sensor unit
CN104917274A (en) * 2014-03-10 2015-09-16 施耐德电器工业公司 Power supply device and method for wireless sensor unit
CN105067131A (en) * 2015-06-30 2015-11-18 成都众山科技有限公司 Wireless temperature transmitter with hybrid power supply
CN106549475A (en) * 2015-09-21 2017-03-29 卡孚特能源技术(深圳)有限公司 A kind of wireless senser power supply unit based on semi-conductor thermo-electric generation module
CN105471062A (en) * 2016-01-04 2016-04-06 中冶长天国际工程有限责任公司 Power supply system and method for temperature measurement device of rotary kiln
CN105890786A (en) * 2016-04-09 2016-08-24 安徽大学 Intelligent cable joint system
CN107515040A (en) * 2017-07-18 2017-12-26 杨志强 It is a kind of based on solar powered vibration sensor
CN107515040B (en) * 2017-07-18 2019-11-22 杨志强 It is a kind of based on solar powered vibration sensor
CN108225607A (en) * 2017-11-16 2018-06-29 珠海多监测科技有限公司 Wireless temperature measure module built in a kind of charging connector for electric automobile
CN109067251A (en) * 2018-09-14 2018-12-21 国网黑龙江省电力有限公司电力科学研究院 A kind of low temperature environment route on-Line Monitor Device thermal electric generator
CN109067251B (en) * 2018-09-14 2019-10-08 国网黑龙江省电力有限公司电力科学研究院 A kind of low temperature environment route on-Line Monitor Device thermal electric generator

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