CN104374487A - Passive temperature sensor based on electromagnetic induction - Google Patents
Passive temperature sensor based on electromagnetic induction Download PDFInfo
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- CN104374487A CN104374487A CN201410539025.9A CN201410539025A CN104374487A CN 104374487 A CN104374487 A CN 104374487A CN 201410539025 A CN201410539025 A CN 201410539025A CN 104374487 A CN104374487 A CN 104374487A
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- China
- Prior art keywords
- temperature sensor
- electromagnetic induction
- cable
- passive temperature
- sensor based
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Abstract
The invention discloses a passive temperature sensor based on electromagnetic induction. The passive temperature sensor based on electromagnetic induction comprises a reader and a sensor module. The reader is composed of an external coupling inductor, a power supply circuit, a resonance circuit, a signal detection circuit and a microcontroller unit, and the external coupling inductor is arranged between a main insulating layer and a copper shielding layer. The sensor module is composed of a built-in coupling inductor, a capacitor and a thermistor and is arranged inside the copper shielding layer. The external coupling inductor transmits energy to the sensor module in an electromagnetic coupling mode. The passive temperature sensor based on electromagnetic induction is convenient to install, can monitor the temperature of a key position of an operating cable in real time, and avoid the problem that a wire is hard to lead out of a high-potential position of the cable.
Description
Technical field
The present invention relates to temperature monitoring equipment technical field, especially a kind of passive temperature sensor based on electromagnetic induction.
Background technology
Along with the quick propelling of Process of Urbanization Construction, Urban Electric Network Cabling degree improves rapidly, and underground cable has become the chief component of urban electric power rack, and cable temperature is the important parameter that cable runs.When cable overload operation, easily cause shelf depreciation when cable exceedes rated temperature, acceleration cable insulation is aging, thus accidents caused.Occurred in recent years a lot ofly to cause fire and large-area power outage because cable insulation is aging, solving problems of excessive heat is stop the key that this type of accident occurs, and realizing temperature monitoring is the important means ensureing cable security.
Traditional cable thermometric mode and Problems existing as follows:
One, indirect thermometric mode: by temperature sensor measurement cable surface temperature, then calculate heart yearn internal temperature according to thermodynamics method.This mode Problems existing: 1, the thermal resistance of cable system and thermal capacitance value and environment closely related, be difficult to obtain general numerical computation method; 2, the temperature-time constant of cable is comparatively large, generally more than several hours, therefore cannot quick obtaining cable temperature, and control current-carrying capacity on this basis.
Two, optical fiber direct temperature measurement mode: utilize the insulativity that optical fiber is good, direct contact measurement cable or conductor joint heating position.This mode Problems existing: 1, optical fiber direct temperature measurement needs to implant optical fiber in advance in cable inside, to production and the movement requirement harshness of cable, cost is high; 2, the technological requirement of optical fiber direct temperature measurement to field-mounted process is higher, and especially the connected mode of optical fiber in joint and optical fiber lead the lead-out mode of core to zero potential sensor device from noble potential, remain in certain technology difficulty.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of passive temperature sensor based on electromagnetic induction, Real-Time Monitoring can be carried out to the temperature running cable key position, avoid the problem of cable noble potential extension line difficulty.
In order to achieve the above object, the invention provides a kind of passive temperature sensor based on electromagnetic induction, comprise reader and sensor assembly, described reader is made up of external coupling inductance, power circuit, resonant circuit, signal deteching circuit and micro controller unit, described external coupling inductance is arranged between main insulating layer and copper shield, described sensor assembly is made up of built-in coupling inductance, electric capacity and thermistor three passive elements, and described sensor assembly is arranged at copper shield inside.
Described external coupling inductance transfers energy to sensor assembly by electromagnetic coupled mode.
As shown in Figure 2, the cable at cable splice two ends is linked together by copper aluminium hydraulic pressed connecting pipe, and owing to there is contact resistance between copper aluminium hydraulic pressed connecting pipe and cable, therefore this position is the main pyrotoxin of cable splice.In order to the temperature of Measurement accuracy cable splice in the present invention, temperature sensor should be tried one's best two and be docked the crimping point of cables, because this position is in cable noble potential, in order to not destroy main insulating layer, adopt the mode of wireless transmission by temperature signal through insulation course, be delivered to the receiving trap that outside is positioned at zero potential, adopt the wireless power transmission technology of electromagnetic coupled to solve the temperature sensor being positioned at insulation course inside and cannot adopt external power source problem, avoid using internal battery, ensure safety and the serviceable life of cable splice.
The main circuit of passive temperature sensor of the present invention, as shown in Figure 3, wherein U
infor input power, Q
1, D
1, D
2, Q
2form unidirectional half-bridge circuit; L
2and L
1error device inductance and sensor resonant inductance respectively; C
2with L
2, C
1with L
1form resonator cavity, R
bfor turning off damping resistance; R
sfor heat energy resistance; U
l2for inductance L
2voltage.Its course of work is divided into 2 stages, as shown in Figure 4: first stage (t < t
0) be powering phase, half-bridge circuit exports square wave, and its switching frequency is close to L
2, C
2with, L
1, C
1resonance frequency, now reader is powered to sensor assembly: subordinate phase (t > t
0) be the Signal reception stage, at t
0moment Q
1and Q
2pipe turns off simultaneously, now L
2, C
2on energy be discharged into R fast
b, from L after time delay a period of time
2on the waveform that records be exactly L
1, C
1, R
sthe waveform of damped oscillation.U in this process
infor circuit provides power supply, D
1, D
1forward conduction, oppositely ends.
The present invention adopts the contactless measurement based on way of electromagnetic induction, temperature probe is separated with temperature collection circuit, the two is by electromagnetic coupled mode transmission of information and energy, wherein cable splice inside implanted by temperature probe, directly measure cable temperature by contact type temperature sensor, thus can obtain cable temperature value accurately.
The invention has the beneficial effects as follows: the passive temperature sensor based on electromagnetic induction provided by the present invention, easy for installation, Real-Time Monitoring can be carried out to the temperature running cable key position, avoid the problem of cable noble potential extension line difficulty.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of passive temperature sensor of the present invention.
Fig. 2 is the structural drawing of cable splice described in the present invention.
Fig. 3 is the main circuit diagram of passive temperature sensor of the present invention.
Fig. 4 is the course of work oscillogram of passive temperature sensor in the present invention.
Embodiment
Below by embodiment, the invention will be further described by reference to the accompanying drawings.
As shown in Figure 1,2,3, 4, the invention provides a kind of passive temperature sensor based on electromagnetic induction, comprise reader and sensor assembly, described reader is made up of external coupling inductance, power circuit, resonant circuit, signal deteching circuit and micro controller unit, described external coupling inductance is arranged between main insulating layer and copper shield, described sensor assembly is made up of built-in coupling inductance, electric capacity and thermistor three passive elements, and described sensor assembly is arranged at copper shield inside.
In the present embodiment, described external coupling inductance transfers energy to sensor assembly by electromagnetic coupled mode.
In the present embodiment, the basic procedure of passive temperature working sensor is: reader by the mode of electromagnetic coupled by Energy Coupling to sensor circuit, and make the rlc circuit of sensor work in resonant condition, after sensor resonant circuit reaches stable state, reader fast shut-off power stage, and be converted to Signal reception state, after reader receives the signal of sensor, calculated the temperature of current cable splice by steps such as filtering, amplification, sampling and digital signal processing.
Claims (2)
1. the passive temperature sensor based on electromagnetic induction, comprise reader and sensor assembly, it is characterized in that: described reader is made up of external coupling inductance, power circuit, resonant circuit, signal deteching circuit and micro controller unit, described external coupling inductance is arranged between main insulating layer and copper shield, described sensor assembly is made up of built-in coupling inductance, electric capacity and thermistor three passive elements, and described sensor assembly is arranged at copper shield inside.
2. the passive temperature sensor based on electromagnetic induction according to claim 1, is characterized in that: described external coupling inductance transfers energy to sensor assembly by electromagnetic coupled mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410539025.9A CN104374487A (en) | 2014-10-13 | 2014-10-13 | Passive temperature sensor based on electromagnetic induction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410539025.9A CN104374487A (en) | 2014-10-13 | 2014-10-13 | Passive temperature sensor based on electromagnetic induction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104374487A true CN104374487A (en) | 2015-02-25 |
Family
ID=52553538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410539025.9A Pending CN104374487A (en) | 2014-10-13 | 2014-10-13 | Passive temperature sensor based on electromagnetic induction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104374487A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703491A (en) * | 2014-11-28 | 2016-06-22 | 微动公司 | Transmitter and transmitter group |
| CN108444502A (en) * | 2018-03-28 | 2018-08-24 | 武汉大学 | A kind of sensing system and measurement method based on wireless power transmission |
| CN110261001A (en) * | 2019-06-28 | 2019-09-20 | 浙江荷清柔性电子技术有限公司 | Cable intermediate joint temperature measurement system |
| CN112798651A (en) * | 2019-11-13 | 2021-05-14 | 中国科学院化学研究所 | Passive humidity detection system based on electromagnetic induction |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007033881A1 (en) * | 2007-07-20 | 2009-01-22 | Siemens Ag | Rotor-stator unit with non-contact state detection, corresponding evaluation device and computer program for a software programmable evaluation device |
| DE102008042746A1 (en) * | 2008-10-10 | 2010-04-22 | Robert Bosch Gmbh | Sensor system and method for operating a sensor system |
| CN102175341A (en) * | 2010-11-11 | 2011-09-07 | 浙江图维电力科技有限公司 | Accurate temperature measurement technology and device thereof for cable connector based on radio frequency technology |
| CN203323908U (en) * | 2013-07-16 | 2013-12-04 | 南京益瑞电气有限公司 | Electromagnetic conversion device for wireless temperature measurement |
| CN203798457U (en) * | 2014-02-21 | 2014-08-27 | 江苏省产品质量监督检验研究院 | Direct-buried cable joint temperature signal long-distance acquisition device |
| CN104089720A (en) * | 2014-07-25 | 2014-10-08 | 华帝股份有限公司 | Disconnect-type temperature measuring device |
-
2014
- 2014-10-13 CN CN201410539025.9A patent/CN104374487A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007033881A1 (en) * | 2007-07-20 | 2009-01-22 | Siemens Ag | Rotor-stator unit with non-contact state detection, corresponding evaluation device and computer program for a software programmable evaluation device |
| DE102008042746A1 (en) * | 2008-10-10 | 2010-04-22 | Robert Bosch Gmbh | Sensor system and method for operating a sensor system |
| CN102175341A (en) * | 2010-11-11 | 2011-09-07 | 浙江图维电力科技有限公司 | Accurate temperature measurement technology and device thereof for cable connector based on radio frequency technology |
| CN203323908U (en) * | 2013-07-16 | 2013-12-04 | 南京益瑞电气有限公司 | Electromagnetic conversion device for wireless temperature measurement |
| CN203798457U (en) * | 2014-02-21 | 2014-08-27 | 江苏省产品质量监督检验研究院 | Direct-buried cable joint temperature signal long-distance acquisition device |
| CN104089720A (en) * | 2014-07-25 | 2014-10-08 | 华帝股份有限公司 | Disconnect-type temperature measuring device |
Non-Patent Citations (2)
| Title |
|---|
| 赵争鸣等: "磁耦合谐振式无线电能传输技术新进展", 《中国电机工程学报》 * |
| 阎孟昆等: "基于电磁耦合的电缆导体运行温度直接测量方法", 《高电压技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703491A (en) * | 2014-11-28 | 2016-06-22 | 微动公司 | Transmitter and transmitter group |
| CN108444502A (en) * | 2018-03-28 | 2018-08-24 | 武汉大学 | A kind of sensing system and measurement method based on wireless power transmission |
| CN110261001A (en) * | 2019-06-28 | 2019-09-20 | 浙江荷清柔性电子技术有限公司 | Cable intermediate joint temperature measurement system |
| CN112798651A (en) * | 2019-11-13 | 2021-05-14 | 中国科学院化学研究所 | Passive humidity detection system based on electromagnetic induction |
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| C06 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: ANHUI KEMENG ELECTRONIC TECHNOLOGY CO., LTD. Document name: Notification of Passing Preliminary Examination of the Application for Invention |
|
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150225 |