CN209281407U - A kind of near field identification circuit and system - Google Patents
A kind of near field identification circuit and system Download PDFInfo
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- CN209281407U CN209281407U CN201920084772.6U CN201920084772U CN209281407U CN 209281407 U CN209281407 U CN 209281407U CN 201920084772 U CN201920084772 U CN 201920084772U CN 209281407 U CN209281407 U CN 209281407U
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Abstract
The utility model embodiment is related to passive near field identification technology field, more particularly to a kind of near field identification circuit and system.The circuit includes: master controller；Transmit circuit comprising resonance circuit, detection rectification circuit and amplifying circuit, detection rectification circuit are connect with resonance circuit, amplifying circuit respectively, and resonance circuit and amplifying circuit are connect with master controller；Receive circuit comprising receive rectification circuit, hysteresis comparison circuit, first switch tube, the first bleeder circuit, the second bleeder circuit and first capacitor.According to the first bleeder circuit and the second bleeder circuit that different intrinsic standoff ratios are arranged, master controller can be made to receive different feedback signals, it is achieved in the different types of object to be detected of detection, do not have to that RFID label tag is arranged again simultaneously, circuit structure is simpler, cost reduces, and not vulnerable to the interference of high-intensity magnetic field.
Description
Technical field
The utility model embodiment is related to passive near field identification technology field, more particularly to a kind of near field identification circuit
And system.
Background technique
Non-contact passive recognition methods refers to the object variations that unpowered is detected by way of being not directly contacted with, such as
Blender cup is put into identification, and electric cooker is uncapped identification；The characteristics of because of its Non-contact nondestructive consumption, has no structure limitation and electrical
The advantage of limitation is widely used in household electrical appliances and industrial products detection circuit；Conventional non contact angle measurement method has photoelectricity
Identification and magnetic identification；Photoelectricity identifies usually using infrared external reflection or carrys out recognition detection target to the mode of penetrating；Magnetic identification is divided into constant
Magnetic field identification and electromagnetic field identification, stationary magnetic field identification such as tongue tube, electromagnetic field identification such as RFID (Radio Frequency
Identification, radio frequency identification).
In the process of implementing the utility model, following ask exists in the prior art in the inventor of the utility model
Topic: in current technology, generally using infrared external reflection or to pipe is penetrated, transmitting terminal emits infrared ray, is detected target for photoelectricity identification
Infrared light is blocked or reflected, realizes the detection of target, since the single sensor in photoelectricity identification can only detect having for target
Nothing, so being unable to identification types, if desired identification types, need to increase multiple sensors, cause design complicated, increased costs；
Test side connection tongue tube or switch Hall device in the identification of stationary magnetic field, install magnetic on detected target component
Iron just can detect target when detected gtoal setting sensor, but stationary magnetic field identification also can only individually detect it is tested
Target presence or absence is surveyed, multiple types cannot be identified, if desired identification types, need to increase multiple sensors, pacified by structure
It is distinguished mounted in different location, limited extension detects type, increased costs；RFID detection is by RFID read head antenna circuit and produces
Product controller is connected, and RFID label tag is installed in target to be detected, when target is placed in RFID read head Electromagnetic Fields of Antenna, detection
To target, and the I D value of target can be read, realize detection and distinguish function, no limitation for distinguishing number of species, but RFID
Testing cost is relatively high, and control is complicated, is easy to be interfered by strong magnetic field circumstance；Thus, it is possible to provide a kind of inexpensive, realization multiple target
Contact identification and reliable and stable and strong antijamming capability near field identifying system be particularly necessary.
Utility model content
The utility model embodiment is mainly solving the technical problems that provide a kind of near field identifying system, it is intended to solve mesh
The problem of at high cost in various passive near field identification technologies in preceding technology, poor anti jamming capability.
In a first aspect, in order to solve the above technical problems, the technical solution that the utility model embodiment uses is: mentioning
For a kind of near field identification circuit, it is applied in the identifying system of near field, the near field identifying system includes detection device and to be checked
Object is surveyed, the near field identification circuit includes:
Master controller；
Transmit circuit is set in the detection device, and the transmit circuit includes resonance circuit, detection rectification circuit
And amplifying circuit, the detection rectification circuit are connect with the resonance circuit, the amplifying circuit respectively, the resonance circuit and
The amplifying circuit is connect with the master controller；
Circuit is received, is set on the object to be detected, the reception circuit compares including reception rectification circuit, hysteresis
Circuit, first switch tube, the first bleeder circuit, the second bleeder circuit and first capacitor, the output end for receiving rectification circuit
With respectively with one end of the input terminal of the first switch tube, one end of first bleeder circuit and the first capacitor connect
Connect, it is described receive rectification circuit input terminal respectively with the output end of the first switch tube, second bleeder circuit one
End is connected with the other end of the first capacitor, the other end of first bleeder circuit and second bleeder circuit it is another
End is connect with the positive input of the hysteresis comparison circuit, the output end of the hysteresis comparison circuit and the first switch
The control terminal of pipe connects.
Optionally, the hysteresis comparison circuit includes low pressure difference linear voltage regulator, first diode and hysteresis loop comparator；
The input terminal of the first diode is connect with the output end for receiving rectification circuit, the first diode
Output end respectively with the input terminal of the low pressure difference linear voltage regulator, one end of first bleeder circuit and the first capacitor
One end connection, the low pressure difference linear voltage regulator is connect with the reverse input end of the hysteresis loop comparator and power end, described
Low pressure difference linear voltage regulator provides reference data voltage and power supply for the hysteresis loop comparator.
Optionally, the reception rectification circuit includes the first induction coil, the second capacitor and rectifier bridge；
One end of first induction coil respectively with one end of second capacitor, rectifier bridge one exchange interface connect
It connects, the other end of first induction coil connects with another interface that exchanges of the other end of second capacitor, rectifier bridge respectively
It connecing, the output end of the rectifier bridge is connect with the input terminal of the input terminal of the first switch tube, the first diode respectively,
The input terminal of the rectifier bridge respectively with the output end of the first switch tube, one end of second bleeder circuit, described
The other end of one capacitor connects.
Optionally, the near field identification circuit further includes voltage regulator circuit；
The voltage regulator circuit include the first clipping voltage-stabiliser tube and the second clipping voltage-stabiliser tube, the first clipping voltage-stabiliser tube it is defeated
Enter end to connect with the output end of the rectifier bridge, the output end of the first clipping voltage-stabiliser tube and the second clipping voltage-stabiliser tube
Output end connection, the input terminal of the second clipping voltage-stabiliser tube are connect with the input terminal of the rectifier bridge.
Optionally, the resonance circuit includes second switch, third switching tube, the second induction coil and third capacitor,
The control terminal of the second switch and the control terminal of the third switching tube are connect with the master controller, and described second opens
Close pipe input terminal connect to power supply, the output end of the second switch respectively with one end of second induction coil, institute
State third switching tube input terminal connection, the other end of second induction coil respectively with one end of the third capacitor, institute
Detection rectification circuit connection is stated, the output end of the third switching tube and the other end of the third capacitor are grounded.
Optionally, the detection rectification circuit includes the second diode, third diode, the 4th capacitor and third partial pressure electricity
Road；
The output end of the input terminal of second diode and the third diode with second induction coil
Other end connection, the output end of second diode respectively with one end of the 4th capacitor, the third bleeder circuit
The connection of the input terminal of one end and the amplifying circuit, the other end of the input terminal of the third diode, the 4th capacitor
And the other end of the third bleeder circuit is grounded.
Optionally, first bleeder circuit includes first resistor, and the second bleeder circuit includes second resistance；
One end of the first resistor is connect with one end of the first capacitor, one end of the second resistance and described the
The other end of one capacitor connects, and the other end of the other end of the first resistor and the second resistance is compared with the hysteresis
Circuit connection.
Optionally, the third bleeder circuit includes 3rd resistor, one end of the 3rd resistor respectively with the amplification
One end of circuit, the output end of second diode and the 4th capacitor connects, the other end point of the 3rd resistor
It is not connect with the input terminal of the other end of the 4th capacitor, the third diode.
Optionally, the first switch tube includes N-channel field-effect tube.
Second aspect, in order to solve the above technical problems, the technical solution that the utility model embodiment uses is: mentioning
For a kind of near field identifying system, comprising:
Detection device；
Object to be detected；
And near field identification circuit as described above, the near field identification circuit include master controller, transmit circuit and
Circuit is received, the transmit circuit is set in the detection device, and the reception circuit is set on the object to be detected.
The beneficial effect of the utility model embodiment is: being in contrast to the prior art, implements in the utility model
In mode, near field identification circuit is applied in the identifying system of near field, and the near field identifying system includes detection device and to be detected
Object, the near field identification circuit includes: master controller；Transmit circuit is set in the detection device, the transmit circuit
Including resonance circuit, detection rectification circuit and amplifying circuit, the detection rectification circuit respectively with the resonance circuit, described put
Big circuit connection, the resonance circuit and the amplifying circuit are connect with the master controller；Circuit is received, institute is set to
It states on object to be detected, the reception circuit includes receiving rectification circuit, hysteresis comparison circuit, first switch tube, the first partial pressure electricity
Road, the second bleeder circuit and first capacitor, it is described receive rectification circuit output end with it is defeated with the first switch tube respectively
Enter end, one end of first bleeder circuit is connected with one end of the first capacitor, the input terminal for receiving rectification circuit
Connect respectively with the other end of the output end of the first switch tube, one end of second bleeder circuit and the first capacitor
Connect, the other end of the other end of first bleeder circuit and second bleeder circuit with the hysteresis comparison circuit just
It is connected to input terminal, the output end of the hysteresis comparison circuit is connect with the control terminal of the first switch tube.Basis is set as a result,
The first bleeder circuit and the second bleeder circuit for setting different intrinsic standoff ratios, can make master controller receive different feedback signals,
It is achieved in the different types of object to be detected of detection, while not having to that RFID label tag is arranged again, circuit structure is simpler, cost drop
It is low, and not vulnerable to the interference of high-intensity magnetic field.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these are exemplary
Illustrate not constitute the restriction to embodiment, the element in attached drawing with same reference numbers label is expressed as similar member
Part, unless there are special statement, composition does not limit the figure in attached drawing.
Fig. 1 is a structural schematic diagram of the utility model embodiment near field identification circuit；
Fig. 2 is another structural schematic diagram of the utility model embodiment near field identification circuit.
Specific embodiment
For the ease of understanding the utility model, with reference to the accompanying drawings and detailed description, the utility model is carried out more
Detailed description.It should be noted that it can be directly in another element when element is expressed " being fixed on " another element
Upper or placed in the middle there may be one or more therebetween elements.When an element is expressed " connection " another element, it can
To be directly to another element or elements placed in the middle there may be one or more therebetween.This specification is used
Term "vertical", "horizontal", "left" and "right" and similar statement for illustrative purposes only.
Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model
The normally understood meaning of the technical staff in art field is identical.Art used in the description of the utility model in this specification
Language is only for the purpose of describing specific embodiments, and is not intended to limitation the utility model.Art used in this specification
Language "and/or" includes any and all combinations of one or more related listed items.
The utility model embodiment provides a kind of near field identifying system (not shown), which includes near field
Identification circuit 100, detection device (not shown) and object (not shown) to be detected, wherein near field identification circuit 100 includes main control
Device 10, transmit circuit 20 and reception circuit 30, master controller 10 and transmit circuit 20 are set in detection device, receive circuit 30
It is set on object to be detected, to realize that detection device treats the detection and identification of detectable substance.
Further, Fig. 1 and Fig. 2 are please referred to, Fig. 1 is that a structure of the utility model embodiment near field identification circuit is shown
It is intended to, Fig. 2 is another structural schematic diagram of the utility model embodiment near field identification circuit.The near field identification circuit 100 is answered
For near field identifying system, near field identifying system includes detection device and object to be detected, and near field identification circuit includes: main control
Device 10, transmit circuit 20 and reception circuit 30.
Wherein, transmit circuit 20 includes resonance circuit 21, detection rectification circuit 22 and amplifying circuit 23, detection rectification circuit
22 connect with resonance circuit 21, amplifying circuit 23 respectively, and resonance circuit 21 and amplifying circuit 23 are connect with master controller 10.
Receiving circuit 30 includes receiving rectification circuit 31, hysteresis comparison circuit 32, first switch tube Q1, the first bleeder circuit
33, the second bleeder circuit 34 and first capacitor C1 receive the output end input with first switch tube Q1 respectively of rectification circuit 31
It holds, one end of the first bleeder circuit 33 is connected with the other end of first capacitor C1, the input terminal difference of reception rectification circuit 31
It is connect with the other end of the output end of first switch tube Q1, one end of the second bleeder circuit 34 and the first capacitor, first point
The other end of the other end of volt circuit 33 and the second bleeder circuit 34 is connect with the positive input of hysteresis comparison circuit 32, stagnant
The output end for returning comparison circuit 32 is connect with the control terminal of first switch tube Q1.Optionally, first switch tube Q1 includes N-channel field
Effect pipe, in the utility model embodiment, the input terminal of first switch tube Q1 refers to the drain electrode of N-channel field-effect tube,
The output end of first switch tube Q1 refers to the source electrode of N-channel field-effect tube, and the control terminal of first switch tube Q1 refers to N-channel
The grid of field-effect tube.
In the utility model embodiment, master controller 10 controls resonance circuit 21 and sends carrier signal, when to be detected
When object is entered in the induction range of detection device, i.e., when the circuit 30 that receives on object to be detected enters the electricity that transmit circuit 20 emits
When in magnetic field, reception rectification circuit 31 will receive the carrier signal and be converted into direct current and powers to receive circuit 30, meanwhile, it receives
Circuit 30 will carry out the modulation of intrinsic frequency to signal and feed back to primary transmit-receive radio road 20, and influencing transmit circuit 20 loses its resonance
Humorous, detection rectification circuit 22 detects the modulating wave fed back, then is transmitted to master controller 10, main control by amplifying circuit 23
Device 10 determines object to be detected according to the modulating wave of feedback.It further illustrates, receiving will after rectification circuit 31 receives the carrier signal
Carrier signal is converted into after direct current and charges for first capacitor C1, and acts on the first bleeder circuit 33 and the second bleeder circuit 34,
So as to act on the voltage of the positive input of hysteresis comparison circuit 32 between the first bleeder circuit 33 and the second bleeder circuit 34
Rise, when voltage rises to the trigger voltage of hysteresis comparison circuit 32, hysteresis comparison circuit 32 is acted on high level is exported
The control terminal of first switch tube Q1 is so that first switch tube Q1 is connected, and then reception rectification circuit 31 is made to pass through first switch tube Q1
Short circuit, and then lead to receive rectification circuit 31 and resonance circuit 21 and occur that resonance is detuning, and resonance circuit 21 will receive feedback
Modulating wave back, detection rectification circuit 22 detects the modulating wave fed back, then is transmitted to main control by amplifying circuit 23
Device 10, master controller 10 determine object to be detected according to the modulating wave of feedback.
Further, near field identification circuit 100 further includes first capacitor C1, and hysteresis comparison circuit 32 includes low pressure difference linearity
Voltage-stablizer LDO, first diode D1 and hysteresis loop comparator U1；The input terminal of first diode D1 is defeated with reception rectification circuit 31
Outlet connection, the output end of first diode D1 respectively with the input terminal of low pressure difference linear voltage regulator LDO, the first bleeder circuit 33
One end connected with one end of first capacitor C1, the reverse input end of low pressure difference linear voltage regulator LDO and hysteresis loop comparator 32 and
Power end connection, low pressure difference linear voltage regulator LDO are that hysteresis loop comparator 32 provides reference data voltage Vref and power supply, the
The other end of one capacitor C1 is divided with the input terminal of reception rectification circuit 31, the output end of first switch tube Q1 and second respectively
One end of circuit 34 connects.Direct current signal after receiving rectification circuit 31 and rectifying is further by first capacitor C1 and the one or two
Pole pipe D1 carries out rectifying and wave-filtering and becomes steady dc voltage.Optionally, low pressure difference linear voltage regulator LDO gives for burning voltage
Hysteresis loop comparator 32 provides power supply and reference data voltage Vref, allows hysteresis loop comparator 32 being capable of steady operation.
Receiving rectification circuit 31 includes the first induction coil L1, the second capacitor C2 and rectifier bridge 311；First induction coil L1
One end respectively with one end of the second capacitor C2, rectifier bridge 311 one exchange interface connect, the other end of the first induction coil L1
Connect respectively with another exchange interface of the other end of the second capacitor C2, rectifier bridge 311, the output end of rectifier bridge 311 respectively with
The input terminal connection of the input terminal of first switch tube Q1, first diode D1, the input terminal of rectifier bridge 311 respectively with first switch
The other end connection of the output end of pipe Q1, one end of the second bleeder circuit 34, first capacitor C1.Wherein, the first induction coil L1
A LC resonance network is formed with the second capacitor C2.
In some embodiments, near field identification circuit 100 further includes voltage regulator circuit 35；Voltage regulator circuit 35 includes the first clipping
Voltage-stabiliser tube Z1 and the second clipping voltage-stabiliser tube Z2, the input terminal of the first clipping voltage-stabiliser tube Z1 are connect with the output end of rectifier bridge 311, the
The output end of one clipping voltage-stabiliser tube Z1 is connect with the output end of the second clipping voltage-stabiliser tube Z2, the input terminal of the second clipping voltage-stabiliser tube Z2
It is connect with the input terminal of rectifier bridge 311.First clipping voltage-stabiliser tube Z1 and the second clipping voltage-stabiliser tube Z2 is used for voltage clipping.
Further, resonance circuit 21 includes second switch Q2, third switching tube Q3, the second induction coil L2 and third
The control terminal of capacitor C3, second switch Q2 and the control terminal of third switching tube Q3 are connect with master controller 10, second switch
The input terminal of pipe Q2 is connect with power Vcc, the output end of second switch Q2 respectively with one end of the second induction coil L2, third
The input terminal of switching tube Q3 connects, the other end of the second induction coil L2 respectively with one end of third capacitor C3, detection rectified current
Road 22 connects, and the output end of third switching tube Q3 and the other end of third capacitor C3 are grounded GND.Wherein, master controller 10 can
To be single-chip microcontroller or signal generating circuit, master controller 10 generates square wave carrier signal, so control second switch Q2 and
The on-off of third switching tube Q3 realizes that the second induction coil L2 of driving and third capacitor C3 forms a LC resonance network, transmitting electricity
Magnetic wave carrier signal.Optionally, second switch Q2 includes P-channel field-effect transistor (PEFT) pipe, and third switching tube Q3 includes N-channel field-effect
Pipe, in the utility model embodiment, the input terminal of second switch Q2 refers to the drain electrode of P-channel field-effect transistor (PEFT) pipe, second
The output end of switching tube Q2 refers to the source electrode of P-channel field-effect transistor (PEFT) pipe, and the control terminal of second switch Q2 refers to that P-channel field is imitated
Should pipe grid, the input terminal of third switching tube Q3 refers to the drain electrode of N-channel field-effect tube, the output end of third switching tube Q3
Refer to the source electrode of N-channel field-effect tube, the control terminal of third switching tube Q3 refers to the grid of N-channel field-effect tube.
Further, detection rectification circuit 22 includes the second diode D2, third diode D3, the 4th capacitor C4 and third
Bleeder circuit 221；The input terminal of second diode D2 and the output end of third diode D3 are another with the second induction coil L2
One end connection, the output end of the second diode D2 respectively with one end of the 4th capacitor C4, third bleeder circuit 221 one end and
The input terminal of amplifying circuit 23 connects, the input terminal of third diode D3, the other end of the 4th capacitor C4 and third partial pressure electricity
The other end on road 221 is grounded.
In some embodiments, the first bleeder circuit 33 includes first resistor R1, and the second bleeder circuit 34 includes the second electricity
Hinder R2；One end of first resistor R1 is connect with one end of first capacitor C1, and one end of second resistance R2 is another with first capacitor C1's
One end connection, the other end of first resistor R1 and the other end of second resistance R2 are connect with hysteresis comparison circuit 32.
In some embodiments, third bleeder circuit 221 include 3rd resistor R3, one end of 3rd resistor R3 respectively with put
One end connection of big circuit 23, the output end of the second diode D2 and the 4th capacitor C4, the other end difference of 3rd resistor R3
It is connect with the input terminal of the other end of the 4th capacitor C4, third diode D2.
The principle of the utility model embodiment set forth further below: the first induction coil L1 and the second capacitor C2 composition
One LC resonance network, master controller 10 are felt by controlling the on-off control second of second switch Q2 and third switching tube Q3
The LC resonance network launches carrier signal for answering coil L2 and third capacitor C3 to form, when the reception circuit 30 on object to be detected enters
When in the electromagnetic field that transmit circuit 20 emits, the LC resonance network of the first induction coil L1 and the second capacitor C2 composition receives the load
Direct current is converted by carrier signal by rectifier bridge after wave signal, first capacitor C1 and first diode D1 again carry out the direct current whole
Stream filtering becomes steady dc voltage as first capacitor C1 charging, and acts on the first bleeder circuit 33 and the second bleeder circuit
34, the first clipping voltage-stabiliser tube Z1 and the second clipping voltage-stabiliser tube Z2 are simultaneously to voltage clipping, by the first bleeder circuit 33 and second
After the partial pressure of bleeder circuit 34, which is input to hysteresis loop comparator U1, when the partial pressure is increased to the touching of hysteresis loop comparator U1
When power generation pressure, hysteresis loop comparator U1 acts on the control terminal of first switch tube Q1 so that first switch tube Q1 is led for high level is exported
It is logical, and then make to receive rectification circuit 31 by first switch tube Q1 short circuit, and then cause to receive rectification circuit 31 and resonance circuit
21 generation resonance are detuning, and when partial pressure is decreased below the trigger voltage of hysteresis loop comparator U1, hysteresis loop comparator U1 will be exported
Low level acts on the control terminal of first switch tube Q1 so that first switch tube Q1 shutdown receives rectification circuit 31 and resonance circuit
21 will restore resonance, continue as first capacitor C1 charging, realize signal feedback, and detection rectification circuit 22, which detects, to be fed back
Modulating wave, then master controller 10 is transmitted to by amplifying circuit 23, master controller 10 can detect that receiving circuit 30 modulates admittedly
Determine the impulse wave of frequency, it is only necessary to change the partial pressure for receiving the first bleeder circuit 33 and the second bleeder circuit 34 in circuit 30
Than master controller 10 can detect the impulse waveform of different frequency, to achieve the purpose that distinguish detection, and then according to anti-
The impulse wave of feedback determines object to be detected.
In the utility model embodiment, near field identification circuit 100 is applied in the identifying system of near field, near field identification system
System includes detection device and object to be detected, and near field identification circuit 100 includes: master controller 10；Transmit circuit 20 is set to inspection
It surveys on device, transmit circuit 20 includes resonance circuit 21, detection rectification circuit 22 and amplifying circuit 23, and detection rectification circuit 22 divides
It is not connect with resonance circuit 21, amplifying circuit 23, resonance circuit 21 and amplifying circuit 23 are connect with master controller 10；Receive electricity
Road 30 is set on object to be detected, and receiving circuit 30 includes receiving rectification circuit 31, hysteresis comparison circuit 32, first switch
Pipe Q1, the first bleeder circuit 33, the second bleeder circuit 34 and first capacitor C1, receive rectification circuit 31 output end with respectively with
The input terminal of first switch tube Q1, the first bleeder circuit 33 one end connected with one end of first capacitor C1, receive rectification circuit
The 31 input terminal other end with the output end of first switch tube Q1, one end of the second bleeder circuit 34 and first capacitor C1 respectively
The other end of connection, the other end of the first bleeder circuit 33 and the second bleeder circuit 34 is defeated with the forward direction of hysteresis comparison circuit 32
Enter end connection, the output end of hysteresis comparison circuit 32 is connect with the control terminal of first switch tube Q1.As a result, according to different points of setting
The first bleeder circuit 33 and the second bleeder circuit 34 of pressure ratio, can make master controller 10 receive different feedback signals, by
This, which is realized, detects different types of object to be detected, while not having to that RFID label tag is arranged again, and circuit structure is simpler, and cost reduces,
And not vulnerable to the interference of high-intensity magnetic field.
The foregoing is merely the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
It is equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, directly or indirectly uses
In other related technical areas, it is also included in the patent protection scope of the utility model.
Claims (10)
1. a kind of near field identification circuit, be applied in the identifying system of near field, the near field identifying system include detection device and
Object to be detected, which is characterized in that the near field identification circuit includes:
Master controller；
Transmit circuit is set in the detection device, and the transmit circuit includes resonance circuit, detection rectification circuit and puts
Big circuit, the detection rectification circuit are connect with the resonance circuit, the amplifying circuit respectively, the resonance circuit and described
Amplifying circuit is connect with the master controller；
Circuit is received, is set on the object to be detected, the reception circuit is more electric including receiving rectification circuit, hysteresis
Road, first switch tube, the first bleeder circuit, the second bleeder circuit and first capacitor, it is described receive rectification circuit output end with
It is connect respectively with one end of the input terminal of the first switch tube, one end of first bleeder circuit and the first capacitor,
It is described receive rectification circuit input terminal respectively with the output end of the first switch tube, second bleeder circuit one end and
The other end of the first capacitor connects, and the other end of the other end of first bleeder circuit and second bleeder circuit is equal
It is connect with the positive input of the hysteresis comparison circuit, output end and the first switch tube of the hysteresis comparison circuit
Control terminal connection.
2. near field identification circuit according to claim 1, which is characterized in that
The hysteresis comparison circuit includes low pressure difference linear voltage regulator, first diode and hysteresis loop comparator；
The input terminal of the first diode is connect with the output end for receiving rectification circuit, the output of the first diode
Hold one respectively with the input terminal of the low pressure difference linear voltage regulator, one end of first bleeder circuit and the first capacitor
End connection, the low pressure difference linear voltage regulator are connect with the reverse input end of the hysteresis loop comparator and power end, the low pressure
Difference linear constant voltage regulator provides reference data voltage and power supply for the hysteresis loop comparator.
3. near field identification circuit according to claim 2, which is characterized in that
The reception rectification circuit includes the first induction coil, the second capacitor and rectifier bridge；
One end of first induction coil is connect with an exchange interface of one end of second capacitor, rectifier bridge respectively, institute
The other end for stating the first induction coil is connect with another exchange interface of the other end of second capacitor, rectifier bridge respectively, institute
The output end for stating rectifier bridge is connect with the input terminal of the input terminal of the first switch tube, the first diode respectively, described
The input terminal of rectifier bridge respectively with the output end of the first switch tube, second bleeder circuit one end, it is described first electricity
The other end of appearance connects.
4. near field identification circuit according to claim 3, which is characterized in that the near field identification circuit further includes pressure stabilizing electricity
Road；
The voltage regulator circuit includes the first clipping voltage-stabiliser tube and the second clipping voltage-stabiliser tube, the input terminal of the first clipping voltage-stabiliser tube
It is connect with the output end of the rectifier bridge, the output of the output end of the first clipping voltage-stabiliser tube and the second clipping voltage-stabiliser tube
End connection, the input terminal of the second clipping voltage-stabiliser tube are connect with the input terminal of the rectifier bridge.
5. near field identification circuit according to claim 4, which is characterized in that
The resonance circuit includes second switch, third switching tube, the second induction coil and third capacitor, the second switch
The control terminal of pipe and the control terminal of the third switching tube are connect with the master controller, the input terminal of the second switch
Connect to power supply, the output end of the second switch respectively with one end of second induction coil, the third switching tube
Input terminal connection, the other end of second induction coil respectively with one end of the third capacitor, the detection rectified current
Road connection, the output end of the third switching tube and the other end of the third capacitor are grounded.
6. near field identification circuit according to claim 5, which is characterized in that
The detection rectification circuit includes the second diode, third diode, the 4th capacitor and third bleeder circuit；
The output end of the input terminal of second diode and the third diode is another with second induction coil
End connection, the output end of second diode one end with one end of the 4th capacitor, the third bleeder circuit respectively
And the amplifying circuit input terminal connection, the input terminal of the third diode, the 4th capacitor the other end and
The other end of the third bleeder circuit is grounded.
7. according to claim 1 near field identification circuit described in 6 any one, which is characterized in that
First bleeder circuit includes first resistor, and the second bleeder circuit includes second resistance；
One end of the first resistor is connect with one end of the first capacitor, one end of the second resistance and first electricity
The other end of appearance connects, the other end of the other end of the first resistor and the second resistance with the hysteresis comparison circuit
Connection.
8. near field identification circuit according to claim 6, which is characterized in that
The third bleeder circuit includes 3rd resistor, one end of the 3rd resistor respectively with the amplifying circuit, described
The connection of one end of the output end of two diodes and the 4th capacitor, the other end of the 3rd resistor is respectively with the described 4th
The input terminal connection of the other end of capacitor, the third diode.
9. according to claim 1 near field identification circuit described in 6 any one, which is characterized in that
The first switch tube includes N-channel field-effect tube.
10. a kind of near field identifying system characterized by comprising
Detection device；
Object to be detected；
And near field identification circuit as claimed in any one of claims 1 to 9, the near field identification circuit includes main control
Device, transmit circuit and reception circuit, the transmit circuit are set in the detection device, and the reception circuit is set to institute
It states on object to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920084772.6U CN209281407U (en) | 2019-01-17 | 2019-01-17 | A kind of near field identification circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109635604A (en) * | 2019-01-17 | 2019-04-16 | 深圳和而泰智能控制股份有限公司 | A kind of near field identification circuit and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109635604A (en) * | 2019-01-17 | 2019-04-16 | 深圳和而泰智能控制股份有限公司 | A kind of near field identification circuit and system |
| CN109635604B (en) * | 2019-01-17 | 2023-12-26 | 深圳和而泰智能控制股份有限公司 | Near field identification circuit and system |
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