CN113703355B - Antenna magnetic field intensity control circuit and electronic equipment - Google Patents
Antenna magnetic field intensity control circuit and electronic equipment Download PDFInfo
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- CN113703355B CN113703355B CN202110896930.XA CN202110896930A CN113703355B CN 113703355 B CN113703355 B CN 113703355B CN 202110896930 A CN202110896930 A CN 202110896930A CN 113703355 B CN113703355 B CN 113703355B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
Abstract
The application provides antenna magnetic field intensity's control circuit and electronic equipment, control circuit includes: an antenna; the antenna control circuit is connected with the antenna and is used for transmitting communication data signals to the antenna; an antenna matching circuit disposed between the antenna control circuit and the antenna; the power supply circuit is electrically connected with the antenna control circuit and used for supplying power to the antenna control circuit; and the voltage feedback circuit is respectively electrically connected with the antenna matching circuit and the power supply circuit and is used for detecting a voltage signal of the antenna matching circuit and controlling and adjusting the output voltage of the power supply circuit. The problem that the magnetic field intensity of an existing NFC antenna cannot be automatically adjusted according to the fact that the distance between a coil of the NFC antenna and an external coil of the existing NFC antenna changes is solved.
Description
Technical Field
The present disclosure relates to antenna technologies, and particularly to a control circuit for antenna magnetic field strength and an electronic device.
Background
Traditional NFC non-contact communication circuit all adopts fixed supply voltage as the power of non-contact chip, when the power of non-contact chip is fixed, that non-contact chip's output power is just also fixed, because the NFC antenna has different service environment, when NFC antenna environment is relatively poor, the coil that can touch the NFC antenna under many circumstances is very short with the external coil distance and is big like the magnetic field intensity of the NFC antenna that measures when 0cm, and the magnetic field intensity of the NFC antenna that measures when the distance is far away like 4cm is little, because the output power of non-contact chip is fixed, so the magnetic field intensity of NFC antenna can not be according to the change of external condition and automatically regulated this moment, can not compromise the technical index requirement of the magnetic field intensity of NFC non-contact communication output under the different distance conditions simultaneously, communication quality and the use experience of non-contact communication have been reduced.
Disclosure of Invention
The embodiment of the application provides a control circuit and electronic equipment of antenna magnetic field intensity, has solved the problem that the magnetic field intensity of current NFC antenna can not change and automatically regulated according to the distance between the coil of NFC antenna and the external coil.
The present invention is achieved as described above, and a control circuit for antenna magnetic field strength includes:
an antenna;
the antenna control circuit is connected with the antenna and is used for transmitting communication data signals to the antenna;
an antenna matching circuit disposed between the antenna control circuit and the antenna;
the power supply circuit is electrically connected with the antenna control circuit and used for supplying power to the antenna control circuit;
and the voltage feedback circuit is respectively electrically connected with the antenna matching circuit and the power supply circuit and is used for detecting a voltage signal of the antenna matching circuit and controlling and adjusting the output voltage of the power supply circuit.
According to the control circuit of the antenna magnetic field strength provided by the embodiment of the application, because the voltage at two ends of the antenna is in an inverse proportion relation with the magnetic field strength of the antenna, the voltage signal of the antenna matching circuit, namely the voltage signal at two ends of the antenna, is detected by the voltage feedback circuit, the magnetic field strength of the antenna can be judged to be increased or decreased, then the voltage of the output power supply of the control circuit is adjusted by the control power supply circuit according to the magnetic field strength of the antenna, and because the power supply circuit supplies power to the antenna control circuit, the output power of the antenna control circuit can be changed along with the voltage change of the power supply, therefore, when the distance between the coil of the antenna and the external coil is changed, the magnetic field strength of the antenna can be changed accordingly, the technical index requirements of the coil of the antenna and the external coil on the magnetic field strength output by non-contact communication under different distance conditions are met, and the communication quality and the use experience of the non-contact communication are improved.
In one embodiment, the antenna control circuit includes an antenna control chip, and the power output terminal of the power circuit is electrically connected to the power input terminal of the antenna control chip.
In one embodiment, the antenna control circuit comprises an antenna control chip and a power amplifying circuit;
the power amplification circuit is positioned between the antenna control chip and the antenna matching circuit;
and the power output end of the power supply circuit is electrically connected with the power input end of the power amplification circuit.
In one embodiment, the voltage feedback circuit comprises a first diode, a second diode and a first triode;
the anode of the first diode is connected with the cathode communication signal output end of the antenna matching circuit through a third resistor, and the anode of the second diode is connected with the anode communication signal output end of the antenna matching circuit through a fourth resistor;
the cathode of the first diode and the cathode of the second diode are connected with an eighth resistor, a third capacitor and the base of the first triode, and the other end of the eighth resistor and the other end of the third capacitor are grounded;
an emitting electrode of the first triode is grounded, a collector electrode of the first triode is connected with a twelfth resistor, and the other end of the twelfth resistor is respectively connected with a tenth resistor, an eleventh resistor and a signal feedback end of the power circuit;
the other end of the tenth resistor is connected with a power output end of the power circuit, and the other end of the eleventh resistor is grounded.
In one embodiment, the first transistor is an NPN transistor.
In one embodiment, the control circuit for the antenna magnetic field strength further comprises a receiving circuit, and two ends of the receiving circuit are respectively connected with the antenna control chip and the antenna matching circuit.
In one embodiment, the receiving circuit is a double-ended differential input circuit or a single-ended input circuit.
In one embodiment, the power amplification circuit comprises a second triode and a third triode;
the base electrode of the second triode is connected with the positive electrode communication signal output end of the antenna control chip through a first resistor, the collector electrode of the second triode is respectively connected with a first inductor, a sixth capacitor and the positive electrode communication signal input end of the antenna matching circuit, the other end of the sixth capacitor is grounded, the emitter electrode of the second triode is respectively connected with the first capacitor and a fifth resistor, and the other ends of the first capacitor and the fifth resistor are grounded;
the base electrode of the third triode is connected with the negative electrode communication signal output end of the antenna control chip through a second resistor, the collector electrode of the third triode is respectively connected with a second inductor, a fourth capacitor and the negative electrode communication signal input end of the antenna matching circuit, the other end of the fourth capacitor is grounded, the emitter electrode of the third triode is respectively connected with a second capacitor and a seventh resistor, and the other ends of the second capacitor and the seventh resistor are grounded;
the other end of the first inductor and the other end of the second inductor are both connected with a capacitor and a magnetic bead, the other end of the capacitor is grounded, and the other end of the magnetic bead is connected with the power output end of the power circuit.
In one embodiment, the antenna is a three-terminal NFC antenna.
An embodiment of the present application further provides an electronic device, including the control circuit for the antenna magnetic field strength according to any of the above embodiments.
The application provides a control circuit and electronic equipment's of antenna magnetic field intensity's beneficial effect lies in: this application judges the magnetic field intensity change of antenna through the voltage that detects the antenna both ends, and the power supply voltage value of its output is adjusted to the magnetic field intensity change control power supply circuit according to the antenna, because power supply circuit is for the power supply of antenna control circuit, consequently, antenna control circuit's output power can change along with supply voltage's change, thereby the magnetic field intensity of antenna changes, the coil that can satisfy the antenna more and the technical index requirement of external coil to the magnetic field intensity of non-contact communication output under different distance conditions, the communication quality and the use experience of non-contact communication have been promoted.
Drawings
Fig. 1 is a block diagram of a control circuit for antenna magnetic field strength according to an embodiment of the present disclosure.
Fig. 2 is a block diagram of a control circuit for antenna magnetic field strength according to a second embodiment of the present application.
Fig. 3 is a block diagram of a control circuit for antenna magnetic field strength according to a third embodiment of the present application.
Fig. 4 is a circuit diagram of a voltage feedback circuit.
Fig. 5 is a circuit diagram of a control circuit for the magnetic field strength of the antenna of fig. 3.
Reference numerals: 100. an antenna;
10. an antenna control circuit; 11. an antenna control chip; 12. a power amplification circuit;
20. an antenna matching circuit;
30. a power supply circuit;
40. a voltage feedback circuit;
50. a receiving circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The embodiment of the application provides a control circuit and electronic equipment of antenna magnetic field intensity, has solved the problem that the magnetic field intensity of current NFC antenna can not change and automatically regulated according to the distance between the coil of NFC antenna and the external coil.
Example one
Referring to fig. 1, the control circuit for controlling the magnetic field strength of an antenna provided in the embodiment of the present application includes an antenna 100; the antenna control circuit 10, the antenna control circuit 10 is connected with the antenna 100, the antenna control circuit 10 is used for transmitting communication data signals to the antenna 100; an antenna matching circuit 20, the antenna matching circuit 20 being provided between the antenna control circuit 10 and the antenna 100; the power supply circuit 30, the power supply circuit 30 is electrically connected with the antenna control circuit 10, and is used for supplying power to the antenna control circuit 10; and the voltage feedback circuit 40 is electrically connected with the antenna matching circuit 20 and the power supply circuit 30 respectively, and the voltage feedback circuit 40 is used for detecting a voltage signal of the antenna matching circuit 20 and controlling and adjusting the output voltage of the power supply circuit 30.
According to the control circuit of the antenna magnetic field strength provided by the embodiment of the application, since the voltage at two ends of the antenna 100 is in an inverse relation with the magnetic field strength of the antenna 100, it can be determined whether the magnetic field strength of the antenna 100 is increased or decreased by detecting the voltage signal of the antenna matching circuit 20 through the voltage feedback circuit 40, that is, the voltage signal at two ends of the antenna 100, and then the power supply circuit 30 is controlled to adjust the voltage of the output power supply thereof based on the magnetic field strength of the antenna 100, since the power supply circuit 30 supplies power to the antenna control circuit 10, the output power of the antenna control circuit 10 changes along with the voltage change of the power supply, when the distance between the coil of the antenna 100 and the external coil changes, the magnetic field strength of the antenna 100 changes accordingly, so as to meet the technical index requirements of the coil of the antenna 100 and the external coil on the magnetic field strength output by the non-contact communication under different distance conditions, and improve the communication quality and the use experience of the non-contact communication.
It should be noted that, in the embodiment of the present application, the requirement of the technical index of the magnetic field strength output by the coil of the antenna 100 and the external coil in the non-contact communication under different distance conditions is met by adjusting the magnetic field strength of the antenna 100, specifically, the requirement of the technical specification of the EMV standard is met, the EMV standard aims to establish a unified standard of the card and the terminal interface in the financial IC card payment system, so that all the cards and terminals can be intercommunicated and used under the system, and the adoption of the technology will greatly improve the security of the payment of the bank card and reduce fraudulent activities. When the antenna is specifically applied, 3 PICC test boards are arranged in equipment where an external coil is located, each PICC test board is provided with an external coil, and the latest technical specification requirement of the EMV standard is that when the distance between the external coil on the first PICC test board and the antenna 100 coil is 0cm, the voltage detected by the first PICC test board is 4.3V-7.3V, when the distance between the external coil on the first PICC test board and the antenna 100 coil is 1 cm, the voltage detected by the first PICC test board is 4.25V-7.35V, when the distance between the external coil on the first PICC test board and the antenna 100 coil is 2 cm, the voltage detected by the first PICC test board is 4.2V-7.35V, when the distance between the external coil on the first PICC test board and the antenna 100 coil is 3 cm, the voltage detected by the first PICC test board is 4.02V-7.35V, the distance between the external coil on the first PICC test board and the antenna 100 coil is 4cm, and the voltage detected by the first PICC test board is 3.84; when the distance between the external coil on the second PICC test board and the antenna 100 coil is 0-4 cm, the voltage detected by the second PICC test board is 4.6V-6.95V; when the distance between the external coil on the third PICC test board and the antenna 100 coil is 0cm, the voltage detected by the third PICC test board is 4.11V-8.75V, when the distance between the external coil on the third PICC test board and the antenna 100 coil is 1 cm, the voltage detected by the third PICC test board is 3.91V-8.75V, when the distance between the external coil on the third PICC test board and the antenna 100 coil is 2 cm, the voltage detected by the third PICC test board is 3.71V-8.75V, when the distance between the external coil on the third PICC test board and the antenna 100 coil is 3 cm, the voltage detected by the third PICC test board is 3.47V-8.75V, when the distance between the external coil on the third PICC test board and the antenna 100 coil is 4cm, the voltage detected by the third PICC test board is 3.23V-8.75V.
It can be understood that the power circuit 30 is a DC-DC power module, which is a newly developed miniaturized power switch module, and is a device for converting electric energy of one voltage value into electric energy of another voltage value in a DC circuit, and the miniaturized surface mount integrated circuit and the miniaturized electronic components are assembled into a whole by using the microelectronic technology. In electromagnetism, an electromagnetic field (electromagnetic field) is a physical field generated by a charged object; the charged object in the electromagnetic field can feel the acting force of the electromagnetic field. The interaction between an electromagnetic field and a charged object (charge or current) can be described by maxwell's equations and the lorentz force law, and the magnetic field strength is a physical quantity describing the properties of a magnetic field, denoted by H.
Example two
Referring to fig. 2, in the first embodiment, the antenna control circuit 10 includes an antenna control chip 11, and the power output terminal of the power circuit 30 is electrically connected to the power input terminal of the antenna control chip 11.
In the second embodiment of the present application, the DC-DC power supply directly supplies power to the VCC pin of the power supply of the antenna control chip 11, and the voltage of VCC is changed to automatically adjust and control the output power of the non-contact communication, where the voltage adjustment range of the DC-DC power supply is limited by the withstand voltage range of the antenna control chip 11 itself, and the voltage adjustable range of the DC-DC power supply cannot exceed the working voltage range of the antenna control chip 11 itself.
It should be noted that the type of the antenna control chip 11 in the second embodiment of the present application is not limited.
EXAMPLE III
Referring to fig. 3, on the basis of the first embodiment, the antenna control circuit 10 includes an antenna control chip 11 and a power amplification circuit 12; the power amplifying circuit 12 is positioned between the antenna control chip 11 and the antenna matching circuit 20; the power supply output terminal of the power supply circuit 30 is electrically connected to the power supply input terminal of the power amplification circuit 12.
In the second embodiment of the present application, the power amplifying circuit 12 amplifies the communication data signal output by the antenna control chip 11, so as to increase the magnetic field strength output by the antenna 100, and meanwhile, the voltage feedback circuit 40 determines the magnetic field strength output by the antenna 100 by detecting the voltages at the two ends of the antenna 100, and modulates and rectifies the detected voltage signal to control the size and ratio of the voltage divider resistor on the DC-DC power signal feedback pin, so as to adjust the output voltage Vout of the DC-DC power supply. The output voltage Vout of the DC-DC power supply supplies power to the power amplification circuit 12, and the output voltage of the DC-DC power supply can be automatically adjusted, so that the output power of the power amplification circuit 12 can be automatically adjusted, the self-adjustment purpose is achieved, the magnetic field intensity output by the antenna 100 is kept in a reasonable range, and the requirements of the technical specification of the EMV standard are met. The specific voltage feedback process is that when the voltage at the two ends of the antenna 100 is detected to be higher, namely the magnetic field strength output by the antenna 100 is lower, the DC-DC power supply is controlled to increase the ratio of the voltage dividing resistors on the signal feedback pin, so that the output voltage Vout of the DC-DC power supply is automatically increased, when the voltage at the two ends of the antenna 100 is detected to be lower, namely the magnetic field strength output by the antenna 100 is higher, the DC-DC power supply is controlled to reduce the ratio of the voltage dividing resistors on the signal feedback pin, so that the output voltage of the DC-DC power supply is automatically reduced, and the requirement that the magnetic field strength output by the antenna 100 under the conditions of different distances between the coil of the antenna 100 and an external coil meets the technical specification requirement of the non-contact communication EMV standard is met. Although the adjustment mode can not be continuously adjusted, only two gears can be adjusted, but the adjustable range of the output voltage of the DC-DC power supply is wider, and the adjustable capacity is higher.
It should be noted that the type of the antenna control chip 11 in the third embodiment of the present application is not limited.
Referring to fig. 4, the voltage feedback circuit 40 according to the first to third embodiments of the present application includes a first diode D1, a second diode D2, and a first transistor Q1; the anode of the first diode D1 is connected to the cathode communication signal output end of the antenna matching circuit 20 through a third resistor R3, and the anode of the second diode D2 is connected to the anode communication signal output end of the antenna matching circuit 20 through a fourth resistor R4; the cathode of the first diode D1 and the cathode of the second diode D2 are connected with an eighth resistor R8, a third capacitor C3 and the base of the first triode Q1, and the other end of the eighth resistor R8 and the other end of the third capacitor C3 are grounded; an emitting electrode of the first triode Q1 is grounded, a collector electrode of the first triode Q1 is connected with a twelfth resistor R12, and the other end of the twelfth resistor R12 is respectively connected with a tenth resistor R10, an eleventh resistor R11 and a signal feedback end FB of the power circuit 30; the other end of the tenth resistor R10 is connected to the power output terminal Vout of the power circuit 30, and the other end of the eleventh resistor R11 is grounded.
In the above circuit configuration, the third resistor R3, the fourth resistor R4, and the eighth resistor R8 are current-limiting voltage-dividing resistors, the first diode D1 and the second diode D2 are rectifier diodes, the third capacitor C3 is a bypass capacitor, which has a function of smoothing a voltage and can convert a sine wave signal into a smooth DC voltage, and the tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12 are feedback voltage-dividing resistors of the voltage Vout output by the DC-DC power supply.
The voltage feedback circuit 40 uses the modulated and rectified voltage signal to control the on/off of the first transistor Q1, so as to adjust the ratio of the voltage dividing resistors on the feedback pin FB of the DC-DC power supply, where the first transistor Q1 is an NPN type transistor and is used to control whether the twelfth resistor R12 is connected to the ground. Due to the fact that the distances between the coil of the antenna 100 and the third-party NFC device are different, the coupling effect is also different, the magnetic field strength output by the antenna 100 is also different, and the voltages at the two ends of the antenna 100 are also different. Therefore, when the third-party NFC field intensity detects that the PICC board is close to the coil of the antenna 100, the strength value of the output magnetic field of the antenna 100 detected by the PICC board is increased, the voltage at two ends of the antenna 100 is decreased, the voltage signal at two ends of the antenna 100 passes through the voltage feedback circuit 40, the voltage on the third capacitor C3 is decreased, the first triode Q1 is turned off, the output voltage Vout = ((R10 + R11)/R11) × VFB of the DC-DC power supply is decreased, and the output voltage Vout of the DC-DC power supply is decreased, so that the output power of the antenna 100 is reduced and meets the requirement of the specification standard at a close distance; when a third-party NFC field intensity detection PICC board is far away from a coil of the antenna 100, the intensity value of the output magnetic field of the antenna 100 detected by the PICC board is reduced, the voltage value of two ends of the antenna 100 is increased, the voltage signal of the two ends of the antenna 100 passes through the voltage feedback circuit 40, then the voltage of the third capacitor C3 is increased, the first triode Q1 is conducted, the output voltage Vout = ((R10 = (R12 + R11) + R12 × R11)/R11 × R12) × VFB of the DC-DC power supply is increased, and therefore the output power of the antenna 100 is improved and meets the requirement of the standard at a far distance, and the whole circuit has the function of automatically regulating the output voltage Vout of the DC-DC power supply through negative feedback. Therefore, the output power of the power amplifying circuit 12 is automatically controlled according to the intensity of the magnetic field output by the antenna 100, and the purpose of automatically adjusting the intensity of the magnetic field output by the antenna 100 is achieved.
Referring to fig. 5, in particular, the power amplifying circuit 12 includes a second transistor Q2 and a third transistor Q3; the base electrode of a second triode Q2 is connected with the anode communication signal output end of the antenna control chip 11 through a first resistor R1, the collector electrode of the second triode Q2 is respectively connected with the first inductor L1, a sixth capacitor C6 and the anode communication signal input end of the antenna matching circuit 20, the other end of the sixth capacitor C6 is grounded, the emitter electrode of the second triode Q2 is respectively connected with a first capacitor C1 and a fifth resistor R5, and the other ends of the first capacitor C1 and the fifth resistor R5 are grounded; the base electrode of a third triode Q3 is connected with the negative electrode communication signal output end of the antenna control chip 11 through a second resistor R2, the collector electrode of the third triode Q3 is respectively connected with a second inductor L2, a fourth capacitor C4 and the negative electrode communication signal input end of the antenna matching circuit 20, the other end of the fourth capacitor C4 is grounded, the emitter electrode of the third triode Q3 is respectively connected with a second capacitor C2 and a seventh resistor R7, and the other ends of the second capacitor C2 and the seventh resistor R7 are both grounded; the other end of the first inductor L1 and the other end of the second inductor L2 are both connected to a capacitor C and a magnetic bead L, the other end of the capacitor C is grounded, and the other end of the magnetic bead L is connected to the power output end Vout of the power circuit 30.
In the circuit structure, a power supply of the power amplification circuit 12 is connected to the output voltage Vout of the DC-DC power supply, a second triode Q2 and a third triode Q3 in a circuit diagram of the power amplification circuit 12 are power amplification triodes and have a current amplification effect, the first resistor R1 and the second resistor R2 are triode base current-limiting resistors, the fifth resistor R5 and the seventh resistor R7 are triode emitter resistors, the first capacitor C1 and the second capacitor C2 have a filtering effect, and the first inductor L1/the sixth capacitor C6 and the second inductor L2/the fourth capacitor C4 are LC resonance circuits.
Referring to fig. 2-3, the control circuit for the antenna magnetic field strength according to the second to third embodiments of the present application further includes a receiving circuit 50, and two ends of the receiving circuit 50 are respectively connected to the antenna control chip 11 and the antenna matching circuit 20.
The receiving circuit 50 is used for receiving the signal received by the antenna 100 and transmitting the signal to the antenna control chip 11, so that the antenna control chip 11 transmits the received signal to the processor for processing. The receiving circuit 50 may be a double-ended differential input circuit or a single-ended input circuit, and certainly, if a single-ended input circuit is used, a balun needs to be added to perform unbalanced-balanced conversion on a signal received by the receiving circuit 50.
Referring to fig. 5, the receiving signal RX +/RX-of the receiving circuit 50 is connected to the receiving pin of the antenna control chip 11, and a resistor R and a capacitor C are provided on the line of the receiving signal RX +/RX-.
Referring to fig. 1 to 5, the antenna 100 in the first to third embodiments of the present application is a three-terminal NFC antenna.
The NFC technology is called Near Field Communication (NFC) in the chinese, and the first end and the second end of the three-end NFC antenna used in the present application are used to receive or output Communication data signals, and the third end is used to be grounded, so that the Communication data signals of the anode and the cathode can be separately received and output, and the efficiency of the antenna is higher.
An embodiment of the present application further provides an electronic device, including the control circuit for the antenna magnetic field strength in any of the above embodiments.
The electronic equipment of this application embodiment has adopted antenna magnetic field intensity's control circuit, the automated inspection of antenna 100 magnetic field intensity has been realized to voltage through detecting antenna 100 both ends, according to antenna 100 coil and external coil magnetic field coupling intensity's different automatically regulated antenna control circuit 10's supply voltage, thereby automatically regulated NFC non-contact communication's output, guarantee that electronic equipment all satisfies the technical specification requirement of EMV standard under the NFC non-contact communication distance condition of difference, promote electronic equipment's communication performance and stability. The requirement on the NFC antenna environment in the electronic equipment is further reduced, the requirement on the structural design of the electronic equipment is reduced, and the design difficulty of the electronic equipment is reduced. By adjusting the power supply voltage, the output power of the non-contact communication during the remote communication is increased, the magnetic field intensity output by the antenna 100 during the remote NFC non-contact communication is improved, and the NFC non-contact communication distance is increased.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A control circuit for antenna magnetic field strength, comprising:
an antenna (100);
an antenna control circuit (10), the antenna control circuit (10) being connected to the antenna (100), the antenna control circuit (10) being configured to transmit a communication data signal to the antenna (100);
an antenna matching circuit (20), the antenna matching circuit (20) being disposed between the antenna control circuit (10) and the antenna (100);
a power supply circuit (30), wherein the power supply circuit (30) is electrically connected with the antenna control circuit (10) and used for supplying power to the antenna control circuit (10);
the voltage feedback circuit (40), the voltage feedback circuit (40) is respectively and electrically connected with the antenna matching circuit (20) and the power supply circuit (30), and the voltage feedback circuit (40) is used for detecting a voltage signal of the antenna matching circuit (20) and controlling and adjusting the output voltage of the power supply circuit (30);
the voltage feedback circuit (40) comprises a first diode, a second diode and a first triode;
the anode of the first diode is connected with the cathode communication signal output end of the antenna matching circuit (20) through a third resistor, and the anode of the second diode is connected with the anode communication signal output end of the antenna matching circuit (20) through a fourth resistor;
the cathode of the first diode and the cathode of the second diode are connected with an eighth resistor, a third capacitor and the base of the first triode, and the other end of the eighth resistor and the other end of the third capacitor are grounded;
the emitting electrode of the first triode is grounded, the collector electrode of the first triode is connected with a twelfth resistor, and the other end of the twelfth resistor is respectively connected with a tenth resistor, an eleventh resistor and the signal feedback end of the power circuit (30);
the other end of the tenth resistor is connected with a power output end of the power circuit (30), and the other end of the eleventh resistor is grounded.
2. The antenna magnetic field strength control circuit of claim 1,
the antenna control circuit (10) comprises an antenna control chip (11), and the power output end of the power circuit (30) is electrically connected with the power input end of the antenna control chip (11).
3. The antenna magnetic field strength control circuit according to claim 1,
the antenna control circuit (10) comprises an antenna control chip (11) and a power amplifying circuit (12);
the power amplification circuit (12) is positioned between the antenna control chip (11) and the antenna matching circuit (20);
and the power output end of the power supply circuit (30) is electrically connected with the power input end of the power amplification circuit (12).
4. The antenna of claim 1, wherein the first transistor is an NPN transistor.
5. The antenna magnetic field strength control circuit according to claim 2 or 3, further comprising a receiving circuit (50), wherein both ends of the receiving circuit (50) are respectively connected to the antenna control chip (11) and the antenna matching circuit (20).
6. The control circuit of the antenna magnetic field strength according to claim 5, characterized in that the receiving circuit (50) is a double-ended differential input circuit or a single-ended input circuit.
7. The antenna magnetic field strength control circuit according to claim 3, characterized in that the power amplification circuit (12) comprises a second transistor and a third transistor;
the base electrode of the second triode is connected with the anode communication signal output end of the antenna control chip (11) through a first resistor, the collector electrode of the second triode is respectively connected with a first inductor, a sixth capacitor and the anode communication signal input end of the antenna matching circuit (20), the other end of the sixth capacitor is grounded, the emitter electrode of the second triode is respectively connected with a first capacitor and a fifth resistor, and the other ends of the first capacitor and the fifth resistor are grounded;
the base electrode of the third triode is connected with the negative electrode communication signal output end of the antenna control chip (11) through a second resistor, the collector electrode of the third triode is respectively connected with a second inductor, a fourth capacitor and the negative electrode communication signal input end of the antenna matching circuit (20), the other end of the fourth capacitor is grounded, the emitter electrode of the third triode is respectively connected with a second capacitor and a seventh resistor, and the other ends of the second capacitor and the seventh resistor are grounded;
the other end of the first inductor and the other end of the second inductor are both connected with a capacitor and a magnetic bead, the other end of the capacitor is grounded, and the other end of the magnetic bead is connected with a power output end of the power circuit (30).
8. A control circuit of antenna magnetic field strength according to any of claims 1-3, characterized in that the antenna (100) is a three-terminal NFC antenna.
9. An electronic device, characterized in that it comprises a control circuit of the antenna magnetic field strength according to any of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110896930.XA CN113703355B (en) | 2021-08-05 | 2021-08-05 | Antenna magnetic field intensity control circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110896930.XA CN113703355B (en) | 2021-08-05 | 2021-08-05 | Antenna magnetic field intensity control circuit and electronic equipment |
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