CN109635604B - Near field identification circuit and system - Google Patents
Near field identification circuit and system Download PDFInfo
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- CN109635604B CN109635604B CN201910045025.6A CN201910045025A CN109635604B CN 109635604 B CN109635604 B CN 109635604B CN 201910045025 A CN201910045025 A CN 201910045025A CN 109635604 B CN109635604 B CN 109635604B
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- 239000003990 capacitor Substances 0.000 claims abstract description 68
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 230000006698 induction Effects 0.000 claims description 26
- 230000005669 field effect Effects 0.000 claims description 14
- 239000003381 stabilizer Substances 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 description 18
- 238000010586 diagram Methods 0.000 description 4
- 230000005672 electromagnetic field Effects 0.000 description 4
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- 235000014676 Phragmites communis Nutrition 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
Abstract
The embodiment of the utility model relates to the technical field of passive near field identification, in particular to a near field identification circuit and a near field identification system. The circuit comprises: a main controller; the transmitting circuit comprises a resonance circuit, a detection rectifying circuit and an amplifying circuit, wherein the detection rectifying circuit is respectively connected with the resonance circuit and the amplifying circuit, and the resonance circuit and the amplifying circuit are both connected with the main controller; the receiving circuit comprises a receiving rectifying circuit, a hysteresis comparison circuit, a first switch tube, a first voltage division circuit, a second voltage division circuit and a first capacitor. According to the first voltage dividing circuit and the second voltage dividing circuit with different voltage dividing ratios, the main controller can receive different feedback signals, so that different types of objects to be detected can be detected, meanwhile, an RFID tag does not need to be arranged, the circuit structure is simpler, the cost is reduced, and the interference of a strong magnetic field is not easy to occur.
Description
Technical Field
The embodiment of the utility model relates to the technical field of passive near field identification, in particular to a near field identification circuit and a near field identification system.
Background
The non-contact passive identification method is to detect the target change without power supply in a non-direct contact mode, such as the identification of the placement of a cup of a stirrer and the identification of the uncovering of an electric cooker; because of the non-contact and non-loss characteristics, the sensor has the advantages of no structural limitation and no electrical limitation, and is widely applied to household appliances and industrial product detection circuits; conventional non-contact recognition methods include photoelectric recognition and magnetic recognition; optoelectronic identification typically uses infrared reflection or correlation to identify the detection target; magnetic identification is classified into constant magnetic field identification such as reed pipe and electromagnetic field identification such as RFID (Rad io Frequency I dent if icat ion ).
The inventors of the present utility model have found that the following problems exist in the prior art in the process of implementing the present utility model: in the prior art, the photoelectric identification generally adopts an infrared reflection or correlation tube, the transmitting end transmits infrared rays, the infrared rays are blocked or reflected by a detected target, and the detection of the target is realized, and as a single sensor in the photoelectric identification can only detect the existence of the target, the type cannot be identified, if the type needs to be identified, a plurality of sensors need to be added, so that the design is complex, and the cost is increased; the detection end in the constant magnetic field identification is connected with a reed switch or a switch Hall device, a magnet is arranged on a detected target part, when the detected target is close to a sensor, the detected target can be detected, but the constant magnetic field identification can only independently detect whether the detected target exists or not, and cannot identify multiple types, if the types need to be identified, a plurality of sensors need to be added, the sensors are arranged at different positions to be distinguished through structures, the detection types are limited to be expanded, and the cost is increased; the RFID detection is characterized in that an RFID reading head antenna circuit is connected with a product controller, an RFID tag is arranged on a target to be detected, when the target is placed in an RFID reading head antenna electromagnetic field, the target is detected, the ID value of the target can be read, the detection and distinguishing functions are realized, the limitation of distinguishing types and quantity is avoided, but the RFID detection cost is relatively high, the control is complex, and the RFID is easily interfered by a strong magnetic field environment; it is therefore particularly desirable to provide a near field identification system that is low cost, achieves multi-target contact identification, is reliable and robust, and has high interference resistance.
Disclosure of Invention
The technical problem which is mainly solved by the embodiment of the utility model is to provide a near field identification system, which aims to solve the problems of high cost and poor anti-interference capability in various passive near field identification technologies in the prior art.
In order to solve the above technical problems, a first technical solution adopted in an embodiment of the present utility model is: there is provided a near field identification circuit for use in a near field identification system comprising a detection device and an object to be detected, the near field identification circuit comprising:
a main controller;
the transmitting circuit is arranged on the detecting device and comprises a resonant circuit, a detection rectifying circuit and an amplifying circuit, wherein the detection rectifying circuit is respectively connected with the resonant circuit and the amplifying circuit, and the resonant circuit and the amplifying circuit are both connected with the main controller;
the receiving circuit is arranged on the object to be detected and comprises a receiving rectifying circuit, a hysteresis comparison circuit, a first switch tube, a first voltage division circuit, a second voltage division circuit and a first capacitor, wherein the output end of the receiving rectifying circuit is connected with the input end of the first switch tube, one end of the first voltage division circuit and one end of the first capacitor respectively, the input end of the receiving rectifying circuit is connected with the output end of the first switch tube, one end of the second voltage division circuit and the other end of the first capacitor respectively, the other end of the first voltage division circuit and the other end of the second voltage division circuit are connected with the forward input end of the hysteresis comparison circuit, and the output end of the hysteresis comparison circuit is connected with the control end of the first switch tube.
Optionally, the hysteresis comparison circuit comprises a low dropout linear voltage regulator, a first diode and a hysteresis comparator;
the input end of the first diode is connected with the output end of the receiving rectifying circuit, the output end of the first diode is respectively connected with the input end of the low-dropout linear voltage stabilizer, one end of the first voltage dividing circuit and one end of the first capacitor, the low-dropout linear voltage stabilizer is connected with the reverse input end of the hysteresis comparator and the power supply end, and the low-dropout linear voltage stabilizer provides reference voltage and power supply for the hysteresis comparator.
Optionally, the receiving rectification circuit includes a first induction coil, a second capacitor and a rectification bridge;
one end of the first induction coil is connected with one end of the second capacitor and one alternating current interface of the rectifier bridge respectively, the other end of the first induction coil is connected with the other end of the second capacitor and the other alternating current interface of the rectifier bridge respectively, the output end of the rectifier bridge is connected with the input end of the first switching tube and the input end of the first diode respectively, and the input end of the rectifier bridge is connected with the output end of the first switching tube, one end of the second voltage dividing circuit and the other end of the first capacitor respectively.
Optionally, the near field identification circuit further comprises a voltage stabilizing circuit;
the voltage stabilizing circuit comprises a first amplitude limiting voltage stabilizing tube and a second amplitude limiting voltage stabilizing tube, wherein the input end of the first amplitude limiting voltage stabilizing tube is connected with the output end of the rectifier bridge, the output end of the first amplitude limiting voltage stabilizing tube is connected with the output end of the second amplitude limiting voltage stabilizing tube, and the input end of the second amplitude limiting voltage stabilizing tube is connected with the input end of the rectifier bridge.
Optionally, the resonant circuit includes second switch tube, third switch tube, second induction coil and third electric capacity, the control end of second switch tube with the control end of third switch tube all with main control unit is connected, the input of second switch tube is connected with the power, the output of second switch tube respectively with the one end of second induction coil the input of third switch tube is connected, the other end of second induction coil respectively with the one end of third electric capacity the detection rectifier circuit is connected, the output of third switch tube with the other end of third electric capacity all ground connection.
Optionally, the detection rectifying circuit includes a second diode, a third diode, a fourth capacitor and a third voltage dividing circuit;
the input end of the second diode and the output end of the third diode are connected with the other end of the second induction coil, the output end of the second diode is respectively connected with one end of the fourth capacitor, one end of the third voltage dividing circuit and the input end of the amplifying circuit, and the input end of the third diode, the other end of the fourth capacitor and the other end of the third voltage dividing circuit are grounded.
Optionally, the first voltage dividing circuit includes a first resistor, and the second voltage dividing circuit includes a second resistor;
one end of the first resistor is connected with one end of the first capacitor, one end of the second resistor is connected with the other end of the first capacitor, and the other end of the first resistor and the other end of the second resistor are connected with the hysteresis comparison circuit.
Optionally, the third voltage dividing circuit includes a third resistor, one end of the third resistor is connected with the amplifying circuit, the output end of the second diode and one end of the fourth capacitor, and the other end of the third resistor is connected with the other end of the fourth capacitor and the input end of the third diode.
Optionally, the first switching tube comprises an N-channel field effect tube.
In order to solve the above technical problems, a second aspect of the present utility model adopts a technical scheme that: there is provided a near field identification system comprising:
a detection device;
an object to be detected;
and the near field identification circuit comprises a main controller, a transmitting circuit and a receiving circuit, wherein the transmitting circuit is arranged on the detection device, and the receiving circuit is arranged on the object to be detected.
The beneficial effects of the embodiment of the utility model are as follows: in an embodiment of the utility model, the near field identification circuit is applied to a near field identification system, the near field identification system comprising a detection device and an object to be detected, the near field identification circuit comprising: a main controller; the transmitting circuit is arranged on the detecting device and comprises a resonant circuit, a detection rectifying circuit and an amplifying circuit, wherein the detection rectifying circuit is respectively connected with the resonant circuit and the amplifying circuit, and the resonant circuit and the amplifying circuit are both connected with the main controller; the receiving circuit is arranged on the object to be detected and comprises a receiving rectifying circuit, a hysteresis comparison circuit, a first switch tube, a first voltage division circuit, a second voltage division circuit and a first capacitor, wherein the output end of the receiving rectifying circuit is connected with the input end of the first switch tube, one end of the first voltage division circuit and one end of the first capacitor respectively, the input end of the receiving rectifying circuit is connected with the output end of the first switch tube, one end of the second voltage division circuit and the other end of the first capacitor respectively, the other end of the first voltage division circuit and the other end of the second voltage division circuit are connected with the forward input end of the hysteresis comparison circuit, and the output end of the hysteresis comparison circuit is connected with the control end of the first switch tube. From this, according to setting up the first bleeder circuit and the second bleeder circuit of different voltage dividing ratios, alright make master controller receive different feedback signals, realize detecting different grade type's waiting to detect the thing from this, no longer need set up the RFID label simultaneously, circuit structure is simpler, and the cost reduces, and is difficult for receiving the interference of strong magnetic field.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures do not depict a proportional limitation unless expressly stated otherwise.
FIG. 1 is a schematic diagram of a near field identification circuit according to an embodiment of the present utility model;
fig. 2 is another schematic diagram of the structure of the near field identification circuit according to the embodiment of the present utility model.
Detailed Description
In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
The embodiment of the utility model provides a near field identification system (not shown), which comprises a near field identification circuit 100, a detection device (not shown) and an object to be detected (not shown), wherein the near field identification circuit 100 comprises a main controller 10, a transmitting circuit 20 and a receiving circuit 30, the main controller 10 and the transmitting circuit 20 are arranged on the detection device, and the receiving circuit 30 is arranged on the object to be detected so as to realize detection and identification of the object to be detected by the detection device.
Further, referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a near field identification circuit according to an embodiment of the present utility model, and fig. 2 is another schematic structural diagram of a near field identification circuit according to an embodiment of the present utility model. The near field identification circuit 100 is applied to a near field identification system, the near field identification system comprises a detection device and an object to be detected, and the near field identification circuit comprises: a main controller 10, a transmitting circuit 20 and a receiving circuit 30.
The transmitting circuit 20 includes a resonance circuit 21, a detection rectifying circuit 22, and an amplifying circuit 23, the detection rectifying circuit 22 is connected to the resonance circuit 21 and the amplifying circuit 23, and the resonance circuit 21 and the amplifying circuit 23 are connected to the main controller 10.
The receiving circuit 30 includes a receiving rectifier circuit 31, a hysteresis comparator circuit 32, a first switching tube Q1, a first voltage divider circuit 33, a second voltage divider circuit 34 and a first capacitor C1, where an output end of the receiving rectifier circuit 31 is connected to an input end of the first switching tube Q1, one end of the first voltage divider circuit 33 and the other end of the first capacitor C1, an input end of the receiving rectifier circuit 31 is connected to an output end of the first switching tube Q1, one end of the second voltage divider circuit 34 and the other end of the first capacitor, and both the other end of the first voltage divider circuit 33 and the other end of the second voltage divider circuit 34 are connected to a positive input end of the hysteresis comparator circuit 32, and an output end of the hysteresis comparator circuit 32 is connected to a control end of the first switching tube Q1. Optionally, the first switching tube Q1 includes an N-channel field effect tube, in this embodiment of the present utility model, an input end of the first switching tube Q1 refers to a drain electrode of the N-channel field effect tube, an output end of the first switching tube Q1 refers to a source electrode of the N-channel field effect tube, and a control end of the first switching tube Q1 refers to a gate electrode of the N-channel field effect tube.
In the embodiment of the present utility model, the main controller 10 controls the resonant circuit 21 to send a carrier signal, when an object to be detected enters the sensing range of the detecting device, that is, when the receiving circuit 30 on the object to be detected enters the electromagnetic field emitted by the transmitting circuit 20, the receiving rectifying circuit 31 receives the carrier signal and converts the carrier signal into direct current to supply power to the receiving circuit 30, meanwhile, the receiving circuit 30 modulates the natural frequency of the signal and feeds back the modulated wave to the original transmitting circuit 20, influences the transmitting circuit 20 to cause resonance detuning, the detecting rectifying circuit 22 detects the fed back modulated wave, and then the modulated wave is transmitted to the main controller 10 by the amplifying circuit 23, and the main controller 10 determines the object to be detected according to the fed back modulated wave. Further, the receiving rectifier circuit 31 converts the carrier signal into a direct current and charges the first capacitor C1, and acts on the first voltage dividing circuit 33 and the second voltage dividing circuit 34 to raise the voltage acting on the forward input end of the hysteresis comparator circuit 32 between the first voltage dividing circuit 33 and the second voltage dividing circuit 34, when the voltage rises to the trigger voltage of the hysteresis comparator circuit 32, the hysteresis comparator circuit 32 acts the output high level on the control end of the first switching tube Q1 to turn on the first switching tube Q1, so that the receiving rectifier circuit 31 is shorted through the first switching tube Q1, and thus both the receiving rectifier circuit 31 and the resonant circuit 21 are resonant and detuned, the resonant circuit 21 receives the modulated wave fed back, the detecting rectifier circuit 22 detects the modulated wave fed back, and the amplifying circuit 23 transmits the modulated wave to the main controller 10, and the main controller 10 determines the object to be detected according to the modulated wave fed back.
Further, the near field identification circuit 100 further includes a first capacitor C1, and the hysteresis comparison circuit 32 includes a low dropout linear regulator LDO, a first diode D1, and a hysteresis comparator U1; the input end of the first diode D1 is connected with the output end of the receiving rectifying circuit 31, the output end of the first diode D1 is respectively connected with the input end of the low dropout linear regulator LDO, one end of the first voltage dividing circuit 33 and one end of the first capacitor C1, the low dropout linear regulator LDO is connected with the reverse input end and the power supply end of the hysteresis comparator U1, the low dropout linear regulator LDO provides reference voltage Vref and a power supply for the hysteresis comparator U1, and the other end of the first capacitor C1 is respectively connected with the input end of the receiving rectifying circuit 31, the output end of the first switch tube Q1 and one end of the second voltage dividing circuit 34. The direct current signal rectified by the receiving rectifying circuit 31 is further rectified and filtered by the first capacitor C1 and the first diode D1 to become a stable direct current voltage. Optionally, the low dropout regulator LDO is configured to provide the power supply and the reference voltage Vref for the hysteresis comparator U1 with the stabilized voltage, so that the hysteresis comparator U1 can operate stably.
The receiving rectifier circuit 31 includes a first induction coil L1, a second capacitor C2, and a rectifier bridge 311; one end of the first induction coil L1 is respectively connected with one end of the second capacitor C2 and one alternating current interface of the rectifier bridge 311, the other end of the first induction coil L1 is respectively connected with the other end of the second capacitor C2 and the other alternating current interface of the rectifier bridge 311, the output end of the rectifier bridge 311 is respectively connected with the input end of the first switch tube Q1 and the input end of the first diode D1, and the input end of the rectifier bridge 311 is respectively connected with the output end of the first switch tube Q1, one end of the second voltage dividing circuit 34 and the other end of the first capacitor C1. The first induction coil L1 and the second capacitor C2 form an LC resonant network.
In some embodiments, near field identification circuit 100 further includes voltage stabilizing circuit 35; the voltage stabilizing circuit 35 includes a first clipping voltage stabilizing tube Z1 and a second clipping voltage stabilizing tube Z2, where an input end of the first clipping voltage stabilizing tube Z1 is connected to an output end of the rectifier bridge 311, an output end of the first clipping voltage stabilizing tube Z1 is connected to an output end of the second clipping voltage stabilizing tube Z2, and an input end of the second clipping voltage stabilizing tube Z2 is connected to an input end of the rectifier bridge 311. The first clipping regulator Z1 and the second clipping regulator Z2 are used for voltage clipping.
Further, the resonant circuit 21 includes a second switching tube Q2, a third switching tube Q3, a second induction coil L2 and a third capacitor C3, where a control end of the second switching tube Q2 and a control end of the third switching tube Q3 are connected with the main controller 10, an input end of the second switching tube Q2 is connected with the power Vcc, an output end of the second switching tube Q2 is connected with one end of the second induction coil L2 and an input end of the third switching tube Q3, another end of the second induction coil L2 is connected with one end of the third capacitor C3 and the detection rectifying circuit 22, and an output end of the third switching tube Q3 and another end of the third capacitor C3 are grounded GND. The main controller 10 may be a single chip microcomputer or a signal generating circuit, and the main controller 10 generates a square wave carrier signal, so as to control the on-off of the second switching tube Q2 and the third switching tube Q3, and drive the second induction coil L2 and the third capacitor C3 to form an LC resonant network, and emit an electromagnetic wave carrier signal. Optionally, the second switching tube Q2 includes a P-channel field effect tube, the third switching tube Q3 includes an N-channel field effect tube, in this embodiment of the present utility model, an input end of the second switching tube Q2 refers to a drain electrode of the P-channel field effect tube, an output end of the second switching tube Q2 refers to a source electrode of the P-channel field effect tube, a control end of the second switching tube Q2 refers to a gate electrode of the P-channel field effect tube, an input end of the third switching tube Q3 refers to a drain electrode of the N-channel field effect tube, an output end of the third switching tube Q3 refers to a source electrode of the N-channel field effect tube, and a control end of the third switching tube Q3 refers to a gate electrode of the N-channel field effect tube.
Further, the detection rectifying circuit 22 includes a second diode D2, a third diode D3, a fourth capacitor C4, and a third voltage dividing circuit 221; the input end of the second diode D2 and the output end of the third diode D3 are connected to the other end of the second induction coil L2, the output end of the second diode D2 is connected to one end of the fourth capacitor C4, one end of the third voltage dividing circuit 221, and the input end of the amplifying circuit 23, and the input end of the third diode D3, the other end of the fourth capacitor C4, and the other end of the third voltage dividing circuit 221 are grounded.
In some embodiments, the first voltage divider circuit 33 includes a first resistor R1, and the second voltage divider circuit 34 includes a second resistor R2; one end of the first resistor R1 is connected to one end of the first capacitor C1, one end of the second resistor R2 is connected to the other end of the first capacitor C1, and the other end of the first resistor R1 and the other end of the second resistor R2 are both connected to the hysteresis comparator circuit 32.
In some embodiments, the third voltage dividing circuit 221 includes a third resistor R3, one end of the third resistor R3 is respectively connected to the amplifying circuit 23, the output end of the second diode D2, and one end of the fourth capacitor C4, and the other end of the third resistor R3 is respectively connected to the other end of the fourth capacitor C4 and the input end of the third diode D2.
The principles of embodiments of the present utility model are further described below: the first induction coil L1 and the second capacitor C2 form an LC resonance network, the main controller 10 controls the on-off of the second switch tube Q2 and the third switch tube Q3 so as to control the LC resonance network formed by the second induction coil L2 and the third capacitor C3 to transmit carrier signals, when the receiving circuit 30 on the object to be detected enters the electromagnetic field transmitted by the transmitting circuit 20, the LC resonance network formed by the first induction coil L1 and the second capacitor C2 receives the carrier signals and converts the carrier signals into direct current by a rectifier bridge, the first capacitor C1 and the first diode D1 convert the direct current into stable direct current voltage through rectification and filtering to charge the first capacitor C1, the first voltage dividing circuit 33 and the second voltage dividing circuit 34 are acted on, the first limiting voltage stabilizing tube Z1 and the second limiting voltage stabilizing tube Z2 simultaneously carry out voltage limiting after the voltage dividing of the first voltage dividing circuit 33 and the second voltage dividing circuit 34, when the divided voltage is input to the hysteresis comparator U1, when the divided voltage is increased to the trigger voltage of the hysteresis comparator U1, the hysteresis comparator U1 applies an output high level to the control end of the first switch tube Q1 to conduct the first switch tube Q1, so that the receiving rectifier circuit 31 is short-circuited through the first switch tube Q1, resonance detuning occurs in both the receiving rectifier circuit 31 and the resonance circuit 21, when the divided voltage is reduced to be lower than the trigger voltage of the hysteresis comparator U1, the hysteresis comparator U1 applies an output low level to the control end of the first switch tube Q1 to enable the first switch tube Q1 to turn off the receiving rectifier circuit 31 and the resonance circuit 21 to restore resonance, and the first capacitor C1 is continuously charged to realize signal feedback, the detecting rectifier circuit 22 detects the modulated wave fed back, and the amplifying circuit 23 transmits the modulated wave to the main controller 10, the main controller 10 can detect the pulse wave modulated by the receiving circuit 30 with fixed frequency, and only needs to change the voltage division ratio of the first voltage division circuit 33 and the second voltage division circuit 34 in the receiving circuit 30, the main controller 10 can detect the pulse wave with different frequencies, so that the aim of distinguishing detection is achieved, and the object to be detected is determined according to the fed-back pulse wave.
In an embodiment of the present utility model, the near field identification circuit 100 is applied to a near field identification system, the near field identification system includes a detection device and an object to be detected, and the near field identification circuit 100 includes: a main controller 10; a transmitting circuit 20 provided on the detecting device, the transmitting circuit 20 including a resonance circuit 21, a detection rectifying circuit 22, and an amplifying circuit 23, the detection rectifying circuit 22 being connected to the resonance circuit 21 and the amplifying circuit 23, respectively, the resonance circuit 21 and the amplifying circuit 23 being connected to the main controller 10; the receiving circuit 30 is disposed on the object to be detected, the receiving circuit 30 includes a receiving rectifier circuit 31, a hysteresis comparator circuit 32, a first switching tube Q1, a first voltage divider circuit 33, a second voltage divider circuit 34 and a first capacitor C1, an output end of the receiving rectifier circuit 31 is connected with an input end of the first switching tube Q1, one end of the first voltage divider circuit 33 and one end of the first capacitor C1, an input end of the receiving rectifier circuit 31 is connected with an output end of the first switching tube Q1, one end of the second voltage divider circuit 34 and the other end of the first capacitor C1, the other end of the first voltage divider circuit 33 and the other end of the second voltage divider circuit 34 are connected with a forward input end of the hysteresis comparator circuit 32, and an output end of the hysteresis comparator circuit 32 is connected with a control end of the first switching tube Q1. Therefore, according to the first voltage dividing circuit 33 and the second voltage dividing circuit 34 with different voltage dividing ratios, the main controller 10 can receive different feedback signals, so that different types of objects to be detected can be detected, meanwhile, the RFID tag does not need to be arranged, the circuit structure is simpler, the cost is reduced, and the interference of a strong magnetic field is not easy to occur.
The foregoing description is only of embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present utility model or directly or indirectly applied to other related technical fields are included in the scope of the present utility model.
Claims (6)
1. A near field identification circuit applied to a near field identification system, wherein the near field identification system comprises a detection device and an object to be detected, and the near field identification circuit comprises:
a main controller;
the transmitting circuit is arranged on the detecting device and comprises a resonant circuit, a detection rectifying circuit and an amplifying circuit, wherein the detection rectifying circuit is respectively connected with the resonant circuit and the amplifying circuit, and the resonant circuit and the amplifying circuit are both connected with the main controller;
the receiving circuit is arranged on the object to be detected and comprises a receiving rectifying circuit, a hysteresis comparison circuit, a first switch tube, a first voltage division circuit, a second voltage division circuit and a first capacitor, wherein the output end of the receiving rectifying circuit is connected with the input end of the first switch tube, one end of the first voltage division circuit and one end of the first capacitor respectively, the input end of the receiving rectifying circuit is connected with the output end of the first switch tube, one end of the second voltage division circuit and the other end of the first capacitor respectively, the other end of the first voltage division circuit and the other end of the second voltage division circuit are connected with the forward input end of the hysteresis comparison circuit, and the output end of the hysteresis comparison circuit is connected with the control end of the first switch tube;
the resonant circuit comprises a second switching tube, a third switching tube, a second induction coil and a third capacitor, wherein the control end of the second switching tube and the control end of the third switching tube are connected with the main controller, the input end of the second switching tube is connected with a power supply, the output end of the second switching tube is respectively connected with one end of the second induction coil and the input end of the third switching tube, the other end of the second induction coil is respectively connected with one end of the third capacitor and the detection rectifying circuit, and the output end of the third switching tube and the other end of the third capacitor are grounded;
the detection rectifying circuit comprises a second diode, a third diode, a fourth capacitor and a third voltage dividing circuit, and the third voltage dividing circuit comprises a third resistor;
the input end of the second diode and the output end of the third diode are connected with the other end of the second induction coil, the output end of the second diode is respectively connected with one end of the fourth capacitor, one end of the third resistor and the input end of the amplifying circuit, and the input end of the third diode, the other end of the fourth capacitor and the other end of the third resistor are grounded.
2. The near field identification circuit of claim 1, wherein the near field identification circuit comprises a near field identification circuit,
the hysteresis comparison circuit comprises a low-dropout linear voltage regulator, a first diode and a hysteresis comparator;
the input end of the first diode is connected with the output end of the receiving rectifying circuit, the output end of the first diode is respectively connected with the input end of the low-dropout linear voltage stabilizer, one end of the first voltage dividing circuit and one end of the first capacitor, the low-dropout linear voltage stabilizer is connected with the reverse input end of the hysteresis comparator and the power supply end, and the low-dropout linear voltage stabilizer provides reference voltage and power supply for the hysteresis comparator.
3. The near field identification circuit of claim 2, wherein the near field identification circuit comprises a near field identification circuit,
the receiving rectifier circuit comprises a first induction coil, a second capacitor and a rectifier bridge;
one end of the first induction coil is connected with one end of the second capacitor and one alternating current interface of the rectifier bridge respectively, the other end of the first induction coil is connected with the other end of the second capacitor and the other alternating current interface of the rectifier bridge respectively, the output end of the rectifier bridge is connected with the input end of the first switching tube and the input end of the first diode respectively, and the input end of the rectifier bridge is connected with the output end of the first switching tube, one end of the second voltage dividing circuit and the other end of the first capacitor respectively.
4. A near field identification circuit as claimed in any one of claims 1 to 3, characterized in that,
the first voltage dividing circuit comprises a first resistor, and the second voltage dividing circuit comprises a second resistor;
one end of the first resistor is connected with one end of the first capacitor, one end of the second resistor is connected with the other end of the first capacitor, and the other end of the first resistor and the other end of the second resistor are connected with the hysteresis comparison circuit.
5. A near field identification circuit as claimed in any one of claims 1 to 3, characterized in that,
the first switching tube comprises an N-channel field effect tube.
6. A near field identification system, comprising:
a detection device;
an object to be detected;
the near field identification circuit according to any one of claims 1 to 5, comprising a main controller, a transmitting circuit and a receiving circuit, wherein the transmitting circuit is arranged on the detecting device, and the receiving circuit is arranged on the object to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910045025.6A CN109635604B (en) | 2019-01-17 | 2019-01-17 | Near field identification circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910045025.6A CN109635604B (en) | 2019-01-17 | 2019-01-17 | Near field identification circuit and system |
Publications (2)
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