CN206847543U - Perceive the proximity transducer interface circuit that metal target detects in place - Google Patents
Perceive the proximity transducer interface circuit that metal target detects in place Download PDFInfo
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- CN206847543U CN206847543U CN201720597222.5U CN201720597222U CN206847543U CN 206847543 U CN206847543 U CN 206847543U CN 201720597222 U CN201720597222 U CN 201720597222U CN 206847543 U CN206847543 U CN 206847543U
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Abstract
本实用新型公开的一种感知金属靶标到位检测的接近传感器接口电路，旨在提供一种可靠度高、性能稳定、能够降低故障的模拟电感输出电路。本实用新型通过下述技术方案予以实现：电感线圈L1与电感线圈L2串联接点电连接继电器K1的常开触点5，电感线圈L2的另一端通过继电器K1的常闭触点4和继电器公共端触点3；公共端触点3电连接模拟电感电路输出端的正端L_HI，电感线圈L1的另一端电连接模拟电感电路输出端的负端L_LO，从而形成电感切换选通开关电路；电感切换选通开关电路对4.8mH的电感线圈L1进行选通，或对串联的4.8mH的电感线圈L1与1mH电感线圈L2进行选通，选择输出4.8mH或5.8mH电感值，作为模拟电感值输出给相应的检测单元。
The utility model discloses a proximity sensor interface circuit for sensing metal target in-position detection, aiming to provide an analog inductance output circuit with high reliability, stable performance and reduced faults. The utility model is realized through the following technical scheme: the inductance coil L1 and the inductance coil L2 are electrically connected in series with the normally open contact 5 of the relay K1, and the other end of the inductance coil L2 passes through the normally closed contact 4 of the relay K1 and the common end of the relay Contact 3; the common terminal contact 3 is electrically connected to the positive end L_HI of the output end of the analog inductance circuit, and the other end of the inductance coil L1 is electrically connected to the negative end L_LO of the output end of the analog inductance circuit, thereby forming an inductance switching strobe switch circuit; the inductance switching strobe The switch circuit gates the inductance coil L1 of 4.8mH, or gates the inductance coil L1 of 4.8mH and the inductance coil L2 of 1mH in series, selects and outputs the inductance value of 4.8mH or 5.8mH, and outputs it as an analog inductance value to the corresponding detection unit.
Description
Technical field
It the utility model is related to one kind and be widely used in weaving, chemical fibre, lathe, machinery, metallurgy, locomotive automobile, aviation etc.
The inductive proximity sensor with simulation output of industry.It is mainly used in displacement measurement and the machine of change in displacement can be converted into
Tool amount（Such as power, tension force, pressure, pressure difference, acceleration, vibration, strain, flow, thickness, liquid level, proportion, torque）The electricity of measurement
Sensor.Particularly it is used for the inductive proximity sensor of simulaed inductance export technique.
Background technology
Inductance sensor is the device to measure by the change for being measured the self-induction for being converted to coil or mutual inductance, and being will be tested
The device that amount is converted to the self-induction of coil or the change of mutual inductance to measure.Inductance sensor also acts as magnetosensitive speed switch, tooth
Wheel age bar tests the speed.Inductance type transducer is mainly used in displacement measurement and can be converted into the mechanical quantity of change in displacement（Such as power, open
Power, pressure, pressure difference, acceleration, vibration, strain, flow, thickness, liquid level, proportion, torque etc.）Measurement.Inductance sensor is surveyed
Amount circuit mainly uses AC bridge.The fixation bridge arm of AC bridge can be resistance, the secondary windings of transformer or close coupling
Inductance.The following shortcoming in accurate measurement be present in the circuit：Linear working range is narrow；Starting electricity is there is during without input
The requirement of zero output when flowing, therefore zero input can not be realized, and magnetic field caused by exciting curent makes armature generation additional displacement will
Cause measurement error.Inductive proximity sensor with simulation output is a kind of electronic signal of measurement formula control position deviation
Generator, it using displacement transducer to the sensitivity characteristic that has close to object, identification object proximity and output switching signal,
Therefore, proximity transducer is generally called proximity switch again, its purposes is very extensive.Such as：Measurable bending and skew；Can
Measure the amplitude height of vibration；The stability of controlled dimensions；Controllable positioning；Controllable centering heart rate or eccentricity.By iron
The change by straight line or angular displacement that the heart and coil are formed is converted to the sensor of winding inductance quantity change, also known as inductance type force-displacement
Sensor.The coil turn and material magnetic capacity of this sensor are all certain, and the change of its inductance value is due to displacement
Input quantity causes caused by the geometrical variations of coil magnetic circuit.When coil is accessed measuring circuit and connects excitation power supply
When, so that it may obtain the voltage for being proportional to displacement input quantity or electric current output.Proximity transducer is Aircraft landing gear system and hatch door
The important component of monitoring switch system, as aeroplane performance requires to improve constantly, to proximity transducer in security, reliable
Property, economy, environmental suitability etc. propose tightened up requirement.The proximity transducer of current aircraft utilization is by iron
The change by straight line or angular displacement that the heart and coil are formed is converted to the sensor of winding inductance quantity change, also known as inductance type force-displacement
Sensor.Inductive proximity sensor is a kind of position sensor of non-cpntact measurement, has reliable operation, stable performance, again
Multiple positioning precision is high, strong etc. without mechanical wear, service life length, no-spark, noiseless, strong antijamming capability, environmental suitability
Outstanding advantages.Its major function is to complete the detection to position quantity, and converts thereof into output switch parameter, so as to realize to load
Control or signal conversion and transmit.
Because the hatch door and Landing Gear System of domestic dual-use aircraft mainly use contact travel switch, contact
The problems such as short life and poor reliability be present in travel switch.Inductive proximity sensor is also referred to as high frequency proximity switch, is to utilize electricity
Eddy current effect controls the starting of oscillation of high-frequency generator and failure of oscillation two states, realizes the detection to position quantity, and convert thereof into
Electric switch amount exports, so as to realize the control to load or the conversion and transmission of signal.Perception sensing element is detection coil, it
It is a part of oscillating circuit, an alternating magnetic field on the working face of detection coil is present.When metal object approaches
During detection coil, metal object will produce vortex and absorb oscillation energy, make oscillations until failure of oscillation.Vibration with failure of oscillation this
Circuit conversion exports two states into switching signal after testing.Because alternating magnetic field caused by higher-order of oscillation coil is scattering ﹐
When the front end of the continuous proximity transducer of metal object, the change of meeting trigger sensor state, cash is gone out around sensor
When belonging to object, sensor sends signal, realizes the detection to position quantity, and converts thereof into the output of electric switch amount, so as to realize
The conversion and transmission of control or signal to load.The coil turn and material magnetic capacity of this sensor are all certain.
Inductive proximity sensor is mainly one group be wound on magnetic conductor a coil, and the change of its inductance value is due to displacement input
Amount causes caused by the geometrical variations of coil magnetic circuit.When coil is accessed measuring circuit and connects excitation power supply,
In the presence of low-frequency ac exciting signal source, target block senses the change of end face distance from it will cause sensor internal magnetic field
Change, and then cause output characterization parameter-inductance of sensor to change, the change of inductance just represents target block
Close to distance.The inductance value of inductive proximity sensor output is through position detection with calculating target after the processing of folding and unfolding control unit
Target block is sensed with a distance from end face from it, and the far and near state for needing to control according to preset value judgement.Coil q Q is reflection
The important parameter of mass of coil, improve the Q values of coil, be coiling it is noted that one of emphasis.At present, the domestic military and people
Contact travel switch is mainly used with the hatch door and Landing Gear System of aircraft, and contact travel switch has short life and reliable
The problems such as property difference.Inductance proximity sensor is in use, it is of interest that the change of magnetic flux flows through inductance coil in other words
Curent change.It is substantially exactly the function value changes for seeing voltage and electric current to be reflected in circuit.Inductive proximity sensor is adopted
Detected in place with to feeromagnetic metal target, sensor initial inductance value is 4.85mH, and setting is close to thresholding inductance value
5mH, it is desirable to which interface circuit output is discrete level signal.The processing such as discrete level output single-chip microcomputer of the generally use with AD.
Given inductance value is needed to position detection and the test of folding and unfolding control unit, the method for generally use there are two kinds, and one kind access is true
Real inductive proximity sensor, another kind are the inductance values for accessing simulaed inductance formula proximity transducer, and latter approach is also
Frequently with mode, can realize low cost multichannel inductance input, in the circuit of realization, complete 4.8mH or 5.8mH
Selection give, but prior art is in actual use, realizes that the given of 4.8mH or 5.8mH is by two basic coils
Both 4.8mH and 1mH connect, and short circuit acquisition are carried out to 1mH coils by relay, the short circuit mode is easy when switched on and off
The contact of ablation relay, while inductance value change delay can be caused, often there is circuit damage and the delay of inductance value switch data
Failure.
The content of the invention
The purpose of this utility model be in view of the shortcomings of the prior art part, there is provided a kind of circuit realiration is simple, into
This low, strong antijamming capability, reliability is high, long lifespan, and stable performance, the perception metal target that can reduce failure detect in place
Proximity transducer interface circuit.
The utility model is reached by following measures, a kind of proximity transducer interface for perceiving metal target and detecting in place
Circuit, including：Inductance coil L1, inductance coil L2 and inductance switching gating circuit switch, and receive computer discrete magnitude letter
Number SW_1 TTL chip phase inverter D1A and driving chip N1A, it is characterised in that：Inductance coil L1 and inductance coil L2 series connections
Point is electrically connected contact relay K1 normally opened contact 5, the normally-closed contact 4 and relay that the inductance coil L2 other end passes through relay K1
Public terminal contacts 3；Public terminal contacts 3 electrically connect the anode L_HI of simulaed inductance circuit output end, the inductance coil L1 other end
The negative terminal L_LO of simulaed inductance circuit output end is electrically connected, so as to form inductance switching gating circuit switch；Driving chip N1A is defeated
Go out to hold the coil negative terminal for the contact relay K1 that is electrically connected, pressure drop occurs in relay K1 coil anode power drives relay K1 coil
And electric work is obtained, relay K1 is switched over by normally opened contact 5 and normally-closed contact 4；Inductance switches gating circuit switch pair
4.8mH inductance coil L1 is gated, or the 4.8mH of series connection inductance coil L1 and 1mH inductance coils L2 is gated,
Selection exports the inductance value of the 4.8mH or 5.8mH analog signal proportional to distance between sensor.
The utility model has the advantages that compared to prior art.
Circuit realiration is simple, and cost is low, strong antijamming capability, and the utility model is using inductance coil L1 and inductance coil L2
Connect contact electrical connection relay K1 normally opened contact 5, the He of normally-closed contact 4 that the inductance coil L2 other end passes through relay K1
The public terminal contacts 3 of relay electrically connect the anode L_HI of simulaed inductance circuit output end, inductance coil L1 other end electrical connection
The negative terminal L_LO of simulaed inductance circuit output end, so as to form inductance switching gating circuit switch；By gating realize 4.8mH or
The selection output of 5.8mH inductance values, repetitive positioning accuracy is high, circuit realiration is simple, and cost is low, and the analog form does not need target
Mark, is not influenceed, strong antijamming capability by other metals.
Reliability is high, long lifespan, stable performance, the utility model use correspond to inductive proximity sensor it is remote with
Close to two states of target block, the discrete magnitude signal SW_1 of the Transistor-Transistor Logic level of computer export is added to TTL chips D1（7406）
Input, driving chip N1A drive relay normally opened or normally-closed contact closure, pass through the inductance switch gating switch electricity
Road is gated to 4.8mH inductance coil L1 or the 4.8mH of series connection inductance coil L1 and 1mH inductance coils L2 is selected
It is logical, take single inductance coil L1 inductance value 4.8mH to combine inductance value 5.8mH with two of inductance coil L1, L2 respectively,
The selection output of 4.8mH or 5.8mH inductance values realizes that it is respectively to be less than 5mH and the two states more than 5mH to simulate inductance value.
This given way that inductance value 4.8mH or 5.8mH is realized by gated fashion, realize simulaed inductance formula proximity transducer
Remote and proximity state.Meanwhile change siller tin oxide contact and increase coil power of the relay original gold plated contact for resistance to adhesion
And electromagnetic force, the stability of work is ensure that, reduces failure, maintenance and use cost has been saved, has improved service efficiency.After
Electrical equipment K1（JS-12N-K）Contact use resistance to adhesion siller tin oxide, the resistance to adhesion in contact, long lifespan.Relay increases coil
Power and electromagnetic force, contact adhesive and release are more strong and rapid, the contact of ablation relay and inductance value when preventing from switching
Change delay.Avoid prior art both two basic coil 4.8mH and 1mH connect, 1mH coils are entered by relay
Row short circuit obtains the given of 4.8mH or 5.8mH, can when switched on and off easy ablation relay contact, also result in inductance
The defects of value changes postpone.
Brief description of the drawings
Fig. 1 is that the utility model perceives the proximity transducer interface circuit principle schematic that metal target detects in place.
The utility model is further illustrated with reference to the accompanying drawings and examples, but is not therefore limited in the utility model
Among described scope of embodiments.
Embodiment
Refering to Fig. 1, in embodiment described below, a kind of proximity transducer interface for perceiving metal target and detecting in place
Circuit, including：Inductance coil L1, inductance coil L2 and inductance switching gating circuit switch, and receive computer discrete magnitude letter
Number SW_1 TTL chip phase inverter D1A and driving chip N1A.Inductance coil L1 connected with inductance coil L2 contact electrical connection after
Electrical equipment K1 normally opened contact 5, the public terminal contacts of normally-closed contact 4 and relay that the inductance coil L2 other end passes through relay K1
3；Public terminal contacts 3 electrically connect the anode L_HI of simulaed inductance circuit output end, inductance coil L1 other end electrical connection simulation
The negative terminal L_LO of inductive circuit output end, so as to form inductance switching gating circuit switch；Driving chip N1A output ends electrically connect
There is pressure drop and obtain electrician in relay K1 coil negative terminal, relay K1 coil anode power drives relay K1 coil
Make, relay K1 is switched over by normally opened contact 5 and normally-closed contact 4；Inductance switches inductance of the gating circuit switch to 4.8mH
Coil L1 is gated, or the 4.8mH of series connection inductance coil L1 and 1mH inductance coils L2 is gated, selection output with
The inductance value of the proportional 4.8mH or 5.8mH analog signals of distance between sensor.4.8mH or 5.8mH inductance values are as simulation
Inductance value is exported to corresponding detection unit.The analog signal of exporting change.Computer discrete magnitude signal SW_1 is received, SW_1 leads to
The logical inversion actuating signal for crossing TTL chip phase inverters D1A reaches driving chip N1A input, and the signal is through driving chip
N1A is anti-phase and Current amplifier output, and N1A output ends are electrically connected contact relay K1 coil negative terminal, and relay K1 coil just terminates+
12V power supplys, electric work is obtained so as to drive relay K1 coil pressure drop occur, normally opened and normally-closed contact switches over.
Pull-up resistor R1 is electrically connected between phase inverter and driving chip N1A.
Relay K1 contact uses the siller tin oxide contact of resistance to adhesion.
Relay coil voltage 12V, 620 ohm of coil resistance, coil power are 220 ~ 290mW, have stronger electromagnetism to inhale
Conjunction and release force.
Connected and obtained using basic inductance coil L1, the inductance coil L2 that two inductance values are respectively 4.8mH and 1mH
5.8mH inductance value.The inductance coil L1 that 4.8mH is only accessed when inductance switching gating circuit switch then exports 4.8mH inductance value,
When the inductance value of both inductance switching gating circuit switch gating inductance coil L1, L2 series value, then output 5.8mH.Driving
In dynamic output circuit, phase inverter D1A output end connects model MC1413P driving chip N1A input.Cut in inductance
Change in gating circuit switch, driving chip N1A output ends are electrically connected contact relay K1 coil negative terminal, relay K1 coil anode
Connect+12V power supplys, the inductance values of inductance coil L1 outputs be 4.8mH, the inductance value that two inductance coils L1, L2 are exported when connecting
For 5.8mH.The discrete magnitude signal SW_1 of the Transistor-Transistor Logic level of computer export is added to the TTL chips D1A of model 7406 input
End, driving chip N1A drive normally opened or normally-closed contact the closure of relay, and inductance switches gating circuit switch to 4.8mH's
Inductance coil L1, L2 that inductance coil L1 is gated or connected realize that inductance value 4.8mH's carries out gating realization with 1mH
The output of 4.8mH or 5.8mH inductance values.
The discrete magnitude signal SW_1 of the Transistor-Transistor Logic level of computer export, TTL chip phase inverters D1A input pin 1 is added to,
D1A output end is connected with driving chip N1A input, while is conducting to+5V power supplys by pull-up resistor R1, exports as collection
Electrode exports OC forms.D1A output pin 2 connects the input pin 1 of driving chip N1A inputs, and N1A output pin 16 connects
Model JS-12N-K relay K1 coil negative terminal is connect, relay K1 coil is just terminating+12V power supplys.TTL chips D1A
And its connected driving chip N1A is reverse output.
When the discrete magnitude signal SW_1 that circuit receives the Transistor-Transistor Logic level of computer export is " 0 " low level, relay K1
2 pin be 0 volt of low level, relay K1 coil there is pressure drop and electric work, relay K1 pin contact 3 and contact 5
Connect, the anode L_HI and negative terminal L_LO of inductance value, i.e. simulaed inductance circuit output that inductance coil output analog quantity is 4.8mH
Between inductance value be 4.8mH.
When the discrete magnitude signal SW_1 that circuit receives the Transistor-Transistor Logic level of computer export is " 1 " high level, relay K1
2 pin be 12 volts of high level, relay K1 coil does not work without pressure drop, relay K1 pin 3 and the contacting of pin 4,
Inductance coil outputting inductance coil L1 and inductance coil L2 series values, analog quantity are 5.8mH inductance value, i.e. simulaed inductance circuit
Inductance value between the anode L_HI and negative terminal L_LO of output is 5.8mH.
Discrete magnitude signal SW_1 passes through TTL chip phase inverter D1A and N1A drivers, the K1 gating outputs of driving relay
4.8mH or 5.8mH inductance value.
Claims (7)
1. a kind of proximity transducer interface circuit for perceiving metal target and detecting in place, including：Inductance coil L1, inductance coil L2
Switch gating circuit switch with inductance, and receive computer discrete magnitude signal SW_1 TTL chip phase inverter D1A and driving core
Piece N1A, it is characterised in that：Inductance coil L1 connects contact electrical connection relay K1 normally opened contact 5 with inductance coil L2, inductance
The public terminal contacts 3 of normally-closed contact 4 and relay that the coil L2 other end passes through relay K1；Public terminal contacts 3 electrically connect mould
Intend the anode L_HI of inductive circuit output end, the negative terminal L_ of inductance coil L1 other end electrical connection simulaed inductance circuit output end
LO, so as to form inductance switching gating circuit switch；Driving chip N1A output ends are electrically connected contact relay K1 coil negative terminal, after
There is pressure drop and obtains electric work in electrical equipment K1 coil anode power drives relay K1 coil, and relay K1 passes through normally opened contact
5 and normally-closed contact 4 switch over；Inductance switching gating circuit switch gates to 4.8mH inductance coil L1, or to series connection
4.8mH inductance coil L1 and 1mH inductance coils L2 gated, selection output is proportional to distance between sensor
The inductance value of 4.8mH or 5.8mH analog signals.
2. the proximity transducer interface circuit that metal target detects in place is perceived as claimed in claim 1, it is characterised in that：Instead
Pull-up resistor R1 is electrically connected between phase device and driving chip N1A.
3. perceiving the proximity transducer interface circuit that metal target detects in place as claimed in claim 1 or 2, its feature exists
In：TTL signal is conducting to+5V power supplys by the pull-up resistor R1 being connected between phase inverter D1A and driving chip N1A, exports and is
Colelctor electrode exports OC forms.
4. the proximity transducer interface circuit that metal target detects in place is perceived as claimed in claim 1, it is characterised in that：Connect
Receive computer discrete magnitude signal SW_1, SW_1 and driving chip is reached by TTL chip phase inverters D1A logical inversion actuating signal
N1A input, and by the way that driving chip N1A is anti-phase and Current amplifier exports.
5. the proximity transducer interface circuit that metal target detects in place is perceived as claimed in claim 1, it is characterised in that：
TTL chips D1A output pin 2 connects the input pin 1 of driving chip N1A inputs, and N1A output pin 16 connects relay
K1 coil negative terminal, relay K1 coil are just terminating+12V power supplys.
6. the proximity transducer interface circuit that metal target detects in place is perceived as claimed in claim 1, it is characterised in that：
TTL chip phase inverter D1A and its connected driving chip N1A are reverse output.
7. the proximity transducer interface circuit that metal target detects in place is perceived as claimed in claim 1, it is characterised in that：From
Dissipate amount signal SW_1 and pass through TTL chip phase inverter D1A and N1A drivers, driving relay K1 gating outputs 4.8mH or 5.8mH
Inductance value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720597222.5U CN206847543U (en) | 2017-05-26 | 2017-05-26 | Perceive the proximity transducer interface circuit that metal target detects in place |
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| CN201720597222.5U CN206847543U (en) | 2017-05-26 | 2017-05-26 | Perceive the proximity transducer interface circuit that metal target detects in place |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108413991A (en) * | 2018-02-12 | 2018-08-17 | 深圳市建讯电子有限公司 | The close detection method and device of wire coil/plate during electromagnetic transmission |
| CN111089532A (en) * | 2020-03-01 | 2020-05-01 | 西安润鑫航空科技有限公司 | A proximity test device and test method for proximity sensor circular radial motion |
| CN112611435A (en) * | 2019-10-04 | 2021-04-06 | 费希尔控制国际公司 | Level sensor with conductive target motion sensing |
| CN112684510A (en) * | 2020-12-04 | 2021-04-20 | 西安理工大学 | Logic test excitation device of magnetic induction type proximity sensor for aviation |
| CN114577254A (en) * | 2022-05-07 | 2022-06-03 | 成都凯天电子股份有限公司 | High reliability detection method and system based on landing gear inductive proximity sensor |
| US11731471B2 (en) * | 2018-04-27 | 2023-08-22 | Fontaine Fifth Wheel Company | Methods and systems for monitoring coupling of fifth wheels to kingpins |
| US11865882B2 (en) | 2019-02-14 | 2024-01-09 | Fontaine Fifth Wheel Company | Apparatuses, systems, and methods for determining and verifying operational states of fifth wheels |
| CN120593804A (en) * | 2025-08-05 | 2025-09-05 | 上海英达森斯半导体科技有限公司 | Dynamically reconfigurable coil structure and its application |
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2017
- 2017-05-26 CN CN201720597222.5U patent/CN206847543U/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108413991A (en) * | 2018-02-12 | 2018-08-17 | 深圳市建讯电子有限公司 | The close detection method and device of wire coil/plate during electromagnetic transmission |
| CN108413991B (en) * | 2018-02-12 | 2020-11-06 | 深圳市建讯电子有限公司 | Method and device for detecting proximity of metal coil/plate in electromagnetic wave transmission process |
| US11731471B2 (en) * | 2018-04-27 | 2023-08-22 | Fontaine Fifth Wheel Company | Methods and systems for monitoring coupling of fifth wheels to kingpins |
| US11865882B2 (en) | 2019-02-14 | 2024-01-09 | Fontaine Fifth Wheel Company | Apparatuses, systems, and methods for determining and verifying operational states of fifth wheels |
| US12304259B2 (en) | 2019-02-14 | 2025-05-20 | Fontaine Fifth Wheel Company | Apparatuses, systems, and methods for determining and verifying operational states of fifth wheels |
| CN112611435A (en) * | 2019-10-04 | 2021-04-06 | 费希尔控制国际公司 | Level sensor with conductive target motion sensing |
| CN111089532A (en) * | 2020-03-01 | 2020-05-01 | 西安润鑫航空科技有限公司 | A proximity test device and test method for proximity sensor circular radial motion |
| CN112684510A (en) * | 2020-12-04 | 2021-04-20 | 西安理工大学 | Logic test excitation device of magnetic induction type proximity sensor for aviation |
| CN112684510B (en) * | 2020-12-04 | 2024-03-29 | 西安理工大学 | Logic test excitation device of magnetic induction type proximity sensor for aviation |
| CN114577254A (en) * | 2022-05-07 | 2022-06-03 | 成都凯天电子股份有限公司 | High reliability detection method and system based on landing gear inductive proximity sensor |
| CN120593804A (en) * | 2025-08-05 | 2025-09-05 | 上海英达森斯半导体科技有限公司 | Dynamically reconfigurable coil structure and its application |
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