CN102607727A - Radio-frequency temperature measuring device with function of resonance isolation electricity-taking - Google Patents
Radio-frequency temperature measuring device with function of resonance isolation electricity-taking Download PDFInfo
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- CN102607727A CN102607727A CN2012100973045A CN201210097304A CN102607727A CN 102607727 A CN102607727 A CN 102607727A CN 2012100973045 A CN2012100973045 A CN 2012100973045A CN 201210097304 A CN201210097304 A CN 201210097304A CN 102607727 A CN102607727 A CN 102607727A
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Abstract
The invention discloses a radio-frequency temperature measuring device which can improve the electricity taking efficiency in a resonance manner, particularly relates to a resonance electricity-taking radio-frequency temperature measuring device used in a power frequency occasion. According to the radio-frequency temperature measuring device, a power management module is connected with a resonance electricity-taking module, a radio frequency module and a signal processing module, wherein the radio frequency module is in signal bidirectional intercommunication with the signal processing module, the signal processing module is connected with a temperature sensitive probe, the resonance electricity-taking module consists of a magnetic core, a coil and a capacitor, and the longitudinal direction of the magnetic core is parallel to the extending direction of a high-voltage bus. The radio-frequency temperature measuring device has the advantages that a product is small in volume, power supply can be obtained well from the bus within the range of 0-50mm from the bus and can be used for the work of the temperature measuring device, and the temperature measuring device has good application value and good market value; and in addition, compared with the prior art, the radio-frequency temperature measuring device is more convenient in implementation and operation, batteries do not need to be replaced often, and the like.
Description
Technical field
The present invention relates to the radio frequency temperature measuring equipment that a kind of mode of utilizing resonance improves power taking efficient, be meant the resonant power taking radio frequency temperature measuring equipment that is used for the power frequency occasion especially.
Background technology
The temperature measuring equipment that under hyperbaric environment, uses, power supply mode commonly used in the market have powered battery, CT power taking, noncontact induction power taking, hybrid power supply etc., and shortcoming is separately all arranged in these power supply modes.
When adopting powered battery,, can not at will have a power failure the battery that can not in time more renew when battery electric quantity exhausts because the hyperbaric environment of power equipment is relevant to sealing; Be easy to generate the liquid outflow because of battery electric quantity exhausts its inner chemical substance of back again, the inner wiring board of corrosion device causes device to damage.When adopting the CT power taking, because the design feature of CT, its physical dimension is than big; Under hyperbaric environment, influence the safe distance of equipment, and its magnetic core part must be surrounded on the bus installation inconvenience very; And produce the magnetic core of different size specification according to the varying in size of bus, the production cycle is long, cost is high; In addition another weak point of CT power taking be its initial working current than higher, be generally more than the 50A.Adopt as announce the non-contact inductive way to take power of CN101656435A " a kind of electricity-fetching method that is used for large-current high-voltage transmission of electricity bus "; With respect to the CT way to take power; It has advantages such as volume is little, easy for installation, with low cost; But also have deficiency, the initial working current of this induction electricity getting device is also bigger, generally also wants more than the 50A.Battery+CT power taking, battery+non-contact inductive power taking are generally adopted in hybrid power supply, though this array mode combines both advantages, also have both shortcomings simultaneously.
Therefore, it is very necessary inventing a kind of efficient way to take power easy for installation, low preparation cost.
Summary of the invention
The objective of the invention is is providing a kind of use under the power frequency environment, resonant isolation power taking radio frequency temperature measuring equipment easy for installation, with low cost, that power taking efficient is high.
The present invention is achieved through following technical proposals:
A kind of radio frequency temperature measuring equipment with resonant isolation power taking is characterized in that: power management module is connected wherein radio-frequency module and the two-way intercommunication of signal processing module signal with resonance electricity-fetching module, radio-frequency module, signal processing module; Signal processing module is connected with temperature-sensing probe.In the present invention, power management module is an intelligence system, the work between can each parts of effective coordination, and intelligent processing scheme.
As preferably, the resonance electricity-fetching module in above-mentioned a kind of radio frequency temperature measuring equipment with resonant isolation power taking is made up of magnetic core, coil and electric capacity.For better technique effect, wherein coil is positioned at the middle horizontal position of magnetic core, and coil is around magnetic core; Placement location for magnetic core; Also be key content of the present invention, can better realize the object of the invention, also be other document can't consult, and the conclusion that simply draws.
As preferably, coil two ends shunt capacitance in above-mentioned a kind of radio frequency temperature measuring equipment with resonant isolation power taking forms resonant capacitance, and its resonance frequency is 50Hz ± 5%.Electric capacity in the present invention; It is vital place of the present invention; Also be the important component part that the present invention finally can realize and obtain good result, though electric capacity often use in circuit, for the resonant isolation way to take power of this employing; Coming devices such as open-air high-tension bus-bar are carried out temperature control, temperature monitoring then is mistake never; Can not expect generally that for the those of ordinary skill in the industry the present invention has made full use of the characteristics of electric capacity just, has realized the object of the invention.
As preferably, the longitudinal direction of magnetic core is parallel to the bearing of trend of high voltage bus in above-mentioned a kind of radio frequency temperature measuring equipment with resonant isolation power taking.
As preferably; Magnetic core is U font or I-shaped structure in above-mentioned a kind of radio frequency temperature measuring equipment with resonant isolation power taking; Among the present invention; For the design of magnetic core is very crucial parts, though U font or I-shaped structure are a conventional structure in other industry, in industry involved in the present invention and be similar to this kind to be used for that high-tension electricity uses the equipment then be never to occur; And used U font or I-shaped structure in the present invention, have extraordinary outstanding for effect of the present invention.
In the present invention, because the environment for use of device is under the high pressure, for improving magnetic flux density through hub of a spool; Magnetic core is made " U " shape or " worker " shape; Coil stationary is installed in the horizontal position in the middle of the magnetic core, and when temperature measuring equipment was installed, the longitudinal direction of magnetic core was parallel to the length direction of bus.When bus passes through current i, produce magnetic field around it, magnetic flux density is Φ, magnetic flux is pooled to the lateral part of magnetic core by the longitudinal component of magnetic core.Suppose that the magnetic core longitudinal component is S perpendicular to the surface area in magnetic field
1, the cross-sectional area of magnetic core lateral part is S
2, then the magnetic flux density of the lateral part (being hub of a spool) through magnetic core is the S of bus ambient magnetic flux density
1/ S
2Doubly.By the induced voltage formula:
Can know that under the constant situation of turn number N, the change amount △ Φ that improves magnetic flux density can improve induced voltage u.
The coil two ends shunt capacitance of resonance electricity-fetching module is referred to as resonant capacitance, selects the suitable resonant capacitance of parameter, and the resonance ratio that makes it with coil is 50Hz ± 5%.When resonance took place, loop characteristic was rendered as pure resistive, and the size of current i determines by loop resistance, i.e. i=u/R, and the voltage U c at electric capacity two ends equals the voltage U at inductance two ends
L, in the opposite direction, i.e. Uc=-U
LIn the present invention, like " the resonance equivalent model " of accompanying drawing 6, loop resistance mainly is the internal resistance R of coil
L, L is the inductance of coil, C is the resonant capacitance that is parallel to the coil two ends, so i=u/R
L(u is an induced voltage).Because the electric current that flows through in the inductance equals ohmically electric current, so the voltage on the inductance can be obtained by following formula:
U
L=X
L·i
=Q·u
X
LThe induction reactance that is called inductance, X
L=2 π fL
Q is called quality factor, Q=X
L/ R
L
In the present invention, the output voltage of resonance electricity-fetching module is by the output of electric capacity two ends, by Uc=-U
L, and top inductive drop formula can know that the output voltage U c that obtains during resonance is Q a times of induced voltage u.
But the Q value is not the bigger the better, and, can be known by formula P=UI (P is a power) that when improving output voltage, the electric current of output reduces with regard to corresponding because the power that the resonance electricity-fetching module is got is limited.When if output voltage is very high, the electric current of output is just very little, can not the supplying apparatus operate as normal, and so too high output voltage does not just have any practical significance.So the Q value should be got a suitable value.In conjunction with the power consumption requirement of this device, the Q value is taken as about 3, is generally 2.8 ~ 3.2, has effect preferably.
Below be the coil that uses same specification in the experiment, use the measured output voltage data of induction type power taking and resonant power taking respectively:
| Bus current (A) | 5.0 | 10.0 | 15.0 | 20.0 | 25.0 |
| Induction type power taking (V) | 0.33 | 0.73 | 1.19 | 1.70 | 2.10 |
| Resonant power taking (V) | 1.01 | 2.28 | 3.62 | 4.98 | 6.32 |
Can know by above data contrast; Under equal conditions; With respect to the induction type power taking, adopt the present invention can improve the output voltage values of electricity-fetching module greatly, can under the less situation of bus current, export enough voltage supplying apparatus work; Thereby can reduce the initial working current of device, make device have using value widely.
In CT power taking or induction power taking; Usually use one to unload the unnecessary energy of can the loop device being got and discharge, damage temperature measuring equipment though this method can prevent effectively that output voltage is too high, this method need extra increase parts; Increased production cost; Can break down in the loop if unload, just might lead the damage of whole device, security is low.In the present invention in order to prevent when bus current is bigger; Resonance electricity-fetching module output voltage is too high and damage temperature measuring equipment; When design, reasonably design the parameter of magnetic core, after bus current reaches certain value; Magnetic core gets into state of saturation, thereby makes the resonance electricity-fetching module output voltage can the proportional increase with the increase of bus current.
Beneficial effect: the small product size that the present invention produced is little, in apart from bus 0 ~ 50mm scope, can well obtain power supply from bus and supply temperature measuring equipment work, and the present invention has excellent application value and marketable value; With respect to prior art implementation and operation and need not often to change battery etc. more easily.
Description of drawings
Fig. 1 structural representation of the present invention
Fig. 2 core structure synoptic diagram of the present invention
The installation diagram of Fig. 3 coil of the present invention and magnetic core
Magnetic field synoptic diagram around Fig. 4 bus of the present invention
Fig. 5 magnetic core of the present invention gather the magnetic functional schematic
Resonance equivalent model synoptic diagram among Fig. 6 the present invention
The schematic diagram of the function of Fig. 7 apparatus of the present invention
Fig. 8 the present invention application synoptic diagram in force
Test bus current and resonant mode induction module output voltage corresponding relation figure among Fig. 9 the present invention
1, resonance electricity-fetching module 2, power management module 3, temperature-sensing probe 4, signal processing module
5, radio-frequency module 11, magnetic core 12 coils 13, electric capacity.
Embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is specified:
According to structure shown in Figure 1; Making one has the radio frequency temperature measuring equipment of resonant isolation power taking; Wherein power management module 2 is connected with resonance electricity-fetching module 1, radio-frequency module 5, signal processing module 4, wherein radio-frequency module 5 and the two-way intercommunication of signal processing module 4 signals; Signal processing module 4 is connected with temperature-sensing probe 3; Resonance electricity-fetching module 1 is made up of magnetic core 11, coil 12 and electric capacity 13, and magnetic core 11 is the U font structure.Measurand can be easy heating positions such as bus, switch contact, cable splice, and measurand is a bus in the present embodiment, and is as shown in Figure 8, and temperature-sensing probe 3 is approaching with measurand.When magnetic core 11 directions as shown in Figure 5 were pressed close to be installed on around the bus, the magnetic field around the bus was imported by the longitudinal component of magnetic core 11, was pooled to the lateral part that is in the middle of the magnetic core 11, so the magnetic flux density in the middle of the magnetic core increases greatly.Because what bus passed through is alternating current, magnetic flux changes and changes along with electric current, so the coil 12 that is fixedly installed on the magnetic core 11 can induce voltage, the size of induced voltage is by coil turn and the decision of flux change rate, that is:
The coil-induced electric voltage frequency that goes out is consistent with the frequency of electric current in the bus; All be 50Hz; The electric capacity 13 of resonance electricity-fetching module 1 is got suitable parameters, makes it resonance frequency with coil and be 50Hz (allow the deviation of a bit, be generally ± 5%); Then can be higher than induced voltage Q voltage U c doubly from the taking-up of electric capacity 13 two ends, the principle of work of the resonance structure in the present embodiment is as shown in Figure 6.
According to structure shown in Figure 1; Making one has the radio frequency temperature measuring equipment of resonant isolation power taking; Wherein power management module 2 is connected with resonance electricity-fetching module 1, radio-frequency module 5, signal processing module 4, wherein radio-frequency module 5 and the two-way intercommunication of signal processing module 4 signals; Signal processing module 4 is connected with temperature-sensing probe 3; Resonance electricity-fetching module 1 is made up of magnetic core 11, coil 12 and electric capacity 13.Coil 12 is positioned at the horizontal position in the middle of the magnetic core 11, and coil 12 is around magnetic core 11.Coil 12 two ends shunt capacitances 13 form resonant capacitance, and in the present embodiment, the resonance frequency of employing is 50Hz, and the deviation amplitude of general resonance frequency is ± 5%.When the high pressure power taking, the longitudinal direction of magnetic core 11 is parallel to the bearing of trend of high voltage bus, and is as shown in Figure 8.Magnetic core 11 is the U font structure.
In the present embodiment, for improving the magnetic flux density through hub of a spool, magnetic core 11 can be made " U " shape, and 11 processing of " U " shape magnetic core are more convenient, and can make the integral layout of device more reasonable, so the present invention preferentially adopts " U " shape magnetic core 11; Structure as shown in Figure 2.
When passing through current i in the bus, around it, produce magnetic field, its magnetic density is represented with Φ, and is as shown in Figure 4.
When magnetic core 11 was pressed close to be installed on around the bus by direction shown in Figure 5, the magnetic field around the bus was imported by the longitudinal component of magnetic core 11, was pooled to the lateral part that is in the middle of the magnetic core 11, so the magnetic flux densities in the middle of the magnetic core 11 increase greatly.Because what bus passed through is alternating current, magnetic flux changes and changes along with electric current, so the coil 12 that is fixedly installed on the magnetic core 11 can induce voltage, the size of induced voltage is by coil turn and the decision of flux change rate, that is:
The electric voltage frequency that coil 12 induces is consistent with the frequency of electric current in the bus; All be 50Hz; The electric capacity 13 of resonance electricity-fetching module is got suitable parameters, makes it resonance frequency with coil and is 50Hz and (allow the deviation of a bit, be generally ± 5%; Then can be higher than induced voltage Q voltage U c doubly from the taking-up of electric capacity 13 two ends, the principle of work of the resonance structure among the embodiment is as shown in Figure 6.
As shown in Figure 7; Alternating voltage by the output of resonant capacitance two ends becomes DC voltage through bridge rectifier; 13 filtering obtain DC voltage more stably through large bulk capacitance; Pass through integrated linear voltage regulator (LDO) voltage stabilizing again and obtain the constant DC pressure, supply signal processing module 4 and radio-frequency module 5 work.Temperature-sensing probe 3 is experienced tested temperature to picture, demonstrates corresponding resistance value, and 3 pairs of power supplys of the resistance of signal processing module 4 and temperature-sensing probe carry out pressure-dividing output voltage Ut, and the magnitude of voltage of Ut reflects the height of temperature.
The MSP430 series monolithic is a kind of 16 super low-power consumptions, have the microprocessor of reduced instruction set computer (RISC); Chip integration becomes the FLASH ROM of 8KB and the RAM of 512B; 10 ADC converters of 2 16 timer conter, 18 passage; WV 1.8 V ~ 3.6 V, its great advantage is its superior low power dissipation design, the full speed running electric current has only 250 μ A under the 1MHz frequency; Electric current has only 0.1 μ A under the park mode, selects for use this single-chip microcomputer can satisfy design requirement of the present invention.Utilize the Chip Microcomputer A C-channel that the voltage U t that reflects temperature value is gathered and convert to digital signal, and then be converted into temperature value.
Radio-frequency module 5 is made up of machine integrated radio frequency chip, inductance capacitance frequency selection network and antenna, and maximum transmission rate 500kbps supports 2-FSK, GFSK and MSK modulation system; Highly sensitive (under the 1.2kbps-and 110dDm, 0.1% packet error rate), adopt serial bus interface; Convenient and processor connects; Can pass through software modification transfer rate, emissive power, correlation parameters such as frequency.Adopt the advantage of machine integrated radio frequency chip to be that simple in structure, low in energy consumption, stability and reliability are high.Device carries out initialization through universal serial bus to radio-frequency module by single-chip microcomputer in energising, configure parameters such as frequency of operation, transfer rate, emissive power.After single-chip microcomputer is accomplished temperature acquisition, conversion, make radio-frequency module get into emission state through serial port command, send temperature data to radio-frequency module through serial ports then.After radio-frequency module is received temperature data, through radio-frequency antenna data transmission is gone out, in the present embodiment, getting quality factor is 3.
Below be the data of testing bus current and resonant mode induction module output voltage corresponding relation in the experiment:
When above-mentioned magnetic core 11 is I-shaped structure, also has identical effect.
Above-mentioned numerical value is depicted as chart, as shown in Figure 9, show that by experimental data after bus current reached 60A, it is saturated that magnetic core is tending towards, and reaches Expected Results of the present invention.
Claims (7)
1. radio frequency temperature measuring equipment with resonant isolation power taking; It is characterized in that: power management module (2) is connected with resonance electricity-fetching module (1), radio-frequency module (5), signal processing module (4), wherein radio-frequency module (5) and the two-way intercommunication of signal processing module (4) signal; Signal processing module (4) is connected with temperature-sensing probe (3).
2. a kind of radio frequency temperature measuring equipment with resonant isolation power taking according to claim 1 is characterized in that: resonance electricity-fetching module (1) is made up of magnetic core (11), coil (12) and electric capacity (13).
3. a kind of radio frequency temperature measuring equipment with resonant isolation power taking according to claim 2 is characterized in that: coil (12) is positioned at the horizontal position in the middle of the magnetic core (11), and coil (12) is around magnetic core (11).
4. a kind of radio frequency temperature measuring equipment with resonant isolation power taking according to claim 2 is characterized in that: coil (12) two ends shunt capacitances (13), form resonant capacitance, and its resonance frequency is 50Hz ± 5%.
5. a kind of radio frequency temperature measuring equipment with resonant isolation power taking according to claim 2 is characterized in that: the longitudinal direction of magnetic core (11) is parallel to the bearing of trend of high voltage bus.
6. a kind of radio frequency temperature measuring equipment with resonant isolation power taking according to claim 2 is characterized in that: magnetic core (11) is U font or I-shaped structure.
7. a kind of radio frequency temperature measuring equipment with resonant isolation power taking according to claim 2 is characterized in that: quality factor are 2.8 ~ 3.2 in the resonance power taking.
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| CN2012100973045A CN102607727A (en) | 2012-04-05 | 2012-04-05 | Radio-frequency temperature measuring device with function of resonance isolation electricity-taking |
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| CN2012100973045A CN102607727A (en) | 2012-04-05 | 2012-04-05 | Radio-frequency temperature measuring device with function of resonance isolation electricity-taking |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014176784A1 (en) * | 2013-05-03 | 2014-11-06 | 3M Innovative Properties Company | System for monitoring temperature of electrical conductor |
| CN105136328A (en) * | 2015-09-30 | 2015-12-09 | 杭州凯源电子有限公司 | Flexible temperature measurement apparatus |
| CN105303205A (en) * | 2015-09-30 | 2016-02-03 | 杭州凯源电子有限公司 | Passive flexible label, passive flexible temperature measurement device and wireless power networking temperature measurement system |
| CN110383103A (en) * | 2017-03-15 | 2019-10-25 | 德克萨斯仪器股份有限公司 | Integrated circuit and transponder circuit with shared modulating capacitor device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009081126A1 (en) * | 2007-12-21 | 2009-07-02 | Amway (Europe) Limited | Circuitry for inductive power transfer |
| CN101656435A (en) * | 2008-10-06 | 2010-02-24 | 杭州凯源电子有限公司 | Power taking method for large-current high-voltage transmission bus |
| CN201532262U (en) * | 2009-11-09 | 2010-07-21 | 厦门立林高压电气有限公司 | High-voltage switch contact and bus on-line temperature measuring device |
| CN202511912U (en) * | 2012-04-05 | 2012-10-31 | 杭州凯源电子有限公司 | Radio frequency temperature measuring device with resonance type isolation electricity taking |
-
2012
- 2012-04-05 CN CN2012100973045A patent/CN102607727A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009081126A1 (en) * | 2007-12-21 | 2009-07-02 | Amway (Europe) Limited | Circuitry for inductive power transfer |
| CN101656435A (en) * | 2008-10-06 | 2010-02-24 | 杭州凯源电子有限公司 | Power taking method for large-current high-voltage transmission bus |
| CN201532262U (en) * | 2009-11-09 | 2010-07-21 | 厦门立林高压电气有限公司 | High-voltage switch contact and bus on-line temperature measuring device |
| CN202511912U (en) * | 2012-04-05 | 2012-10-31 | 杭州凯源电子有限公司 | Radio frequency temperature measuring device with resonance type isolation electricity taking |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014176784A1 (en) * | 2013-05-03 | 2014-11-06 | 3M Innovative Properties Company | System for monitoring temperature of electrical conductor |
| US9885618B2 (en) | 2013-05-03 | 2018-02-06 | 3M Innovative Properties Company | System for monitoring temperature of electrical conductor |
| CN105136328A (en) * | 2015-09-30 | 2015-12-09 | 杭州凯源电子有限公司 | Flexible temperature measurement apparatus |
| CN105303205A (en) * | 2015-09-30 | 2016-02-03 | 杭州凯源电子有限公司 | Passive flexible label, passive flexible temperature measurement device and wireless power networking temperature measurement system |
| CN105303205B (en) * | 2015-09-30 | 2016-08-17 | 杭州凯源电子有限公司 | A kind of flexible passive label, passive flexible temperature measuring equipment and wireless power networking temp measuring system |
| CN106295736A (en) * | 2015-09-30 | 2017-01-04 | 杭州凯源电子有限公司 | A kind of flexible passive label, passive flexible temperature measuring equipment and wireless power networking temp measuring system |
| CN106295736B (en) * | 2015-09-30 | 2018-12-04 | 杭州凯源电子有限公司 | A kind of flexible passive label, passive flexible temperature measuring equipment and wireless power networking temp measuring system |
| CN105136328B (en) * | 2015-09-30 | 2019-03-01 | 杭州凯源电子有限公司 | A kind of flexibility temperature measuring equipment |
| CN110383103A (en) * | 2017-03-15 | 2019-10-25 | 德克萨斯仪器股份有限公司 | Integrated circuit and transponder circuit with shared modulating capacitor device |
| CN110383103B (en) * | 2017-03-15 | 2023-12-29 | 德克萨斯仪器股份有限公司 | Integrated circuit and transponder circuit with shared modulation capacitor |
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Application publication date: 20120725 |