CN110049477B

CN110049477B - Control circuit of multifunctional machine, multifunctional machine and multifunctional communication system

Info

Publication number: CN110049477B
Application number: CN201910332797.8A
Authority: CN
Inventors: 汤付康; 刘慧�; 袁硕
Original assignee: Shenzhen Fise Technology Holding Co ltd
Current assignee: Shenzhen Fise Technology Holding Co ltd
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2024-02-23
Anticipated expiration: 2039-04-24
Also published as: CN110049477A

Abstract

A control circuit of a multifunctional machine, a multifunctional machine and a multifunctional communication system, the control circuit of the multifunctional machine comprises: the main control module is used for generating a radio frequency communication signal, an audio signal and a charging control signal according to the charging detection signal; the radio frequency communication module is used for receiving radio frequency signals sent by the antenna, processing the radio frequency signals to obtain analog control signals, processing radio frequency communication signals and outputting the processed radio frequency signals to the antenna; the audio power amplifier module is used for performing anti-sound breaking treatment, filtering treatment and amplification treatment on the audio signal; the frequency modulation module is used for generating an analog voice signal after filtering, amplifying, mixing and demodulating the frequency modulation signal output by the antenna; the charging module is used for generating a charging detection signal when the insertion of the charging equipment is detected and charging according to the charging control signal; the NFC communication module is used for conducting NFC communication with the card reader; therefore, the control circuit of the multifunctional machine has higher communication compatibility.

Description

Control circuit of multifunctional machine, multifunctional machine and multifunctional communication system

Technical Field

The invention belongs to the technical field of electronic circuits, and particularly relates to a control circuit of a multifunctional machine, the multifunctional machine and a multifunctional communication system.

Background

Along with the continuous improvement of the living standard of people, the communication modes adopted by people are various, and the demands of users in different age groups on communication equipment are different, when the communication equipment is applied to an external communication system, various signal interaction functions can be realized through the communication equipment so as to meet the remote information interaction performance of people; the internal communication mode of the communication equipment also changes greatly along with the development of an electronic design process, and taking a mobile phone as an example, the mobile phones 2G, 3G, 4G and even 5G mobile phones are gradually applied, young users often adopt communication equipment with more abundant functions and more intelligent functions, such as 4G and even 5G mobile phones, and the 2G mobile phones and 3G mobile phones gradually exit from the mobile phone business competition market in consideration of the requirements of related telecom operators for reducing the running and maintenance cost of a communication network; therefore, the research on the 2G and 3G mobile phone related communication technology is also in a state of stagnation in the current electronic communication technology.

However, people have diversity in using mobile phones, a part of old users are more used to the use of 2G mobile phones, for example, for older people, the double-card double-standby auxiliary card and the 2G mobile phones have better use experience, and the 4G mobile phones which are more intelligent in the traditional technology bring great inconvenience to the use of the old people; however, 2G mobile phones gradually stop using in the current market, and the 2G mobile phones have single functions and cannot meet the modern communication requirements; therefore, the communication mode of the communication equipment in the traditional technology is single, the use requirements of different technicians cannot be met, the compatibility is low, and the problem of great inconvenience is brought to the use of users.

Disclosure of Invention

In view of the above, the embodiment of the invention provides a control circuit of a multifunctional machine, a multifunctional machine and a multifunctional communication system, which aim to solve the problems that in the traditional technical scheme, the communication mode of communication equipment is single, the compatibility is low, the use requirements of different technicians are difficult to meet, and the practical value is low.

A first aspect of an embodiment of the present invention provides a control circuit of a multifunctional machine, including:

the main control module is used for generating a radio frequency communication signal, an audio signal and a charging control signal according to the charging detection signal;

the radio frequency communication module is connected with the antenna and the main control module and is used for receiving radio frequency signals sent by the antenna, performing filtering processing, amplifying processing, mixing processing and demodulation processing on the radio frequency signals to obtain analog control signals, and outputting the analog control signals to the antenna after performing encryption processing, modulation processing, filtering processing and amplifying processing on the radio frequency communication signals;

the audio power amplifier module is connected with the main control module and used for amplifying, preventing sound breaking and filtering the audio signals;

the frequency modulation module is connected with the antenna and the main control module and is used for generating an analog voice signal after filtering, amplifying, mixing and demodulating the frequency modulation signal output by the antenna;

The charging module is connected with the main control module, the radio frequency communication module and the audio power amplifier module, and is used for generating the charging detection signal when detecting the insertion of the charging equipment, feeding the charging detection signal back to the main control module and charging according to the charging control signal; and

and the NFC communication module is connected with the main control module and used for conducting NFC communication with the card reader.

In one embodiment thereof, the method further comprises:

and the overvoltage protection module is connected with the charging module and is used for carrying out overvoltage protection on the charging module when the charging voltage of the charging module is larger than a preset safety voltage.

In one embodiment thereof, the charging module comprises:

the sampling unit is connected with the main control module and used for acquiring the charging voltage of the charging module according to the charging control signal to obtain a sampling signal;

the state display unit is connected with the sampling unit and the main control module and is used for displaying the charging state information of the charging module according to the sampling signal; and

the safety detection unit is connected with the main control module and is used for detecting whether the voltage of the charging equipment is larger than the safety charging voltage or not and detecting whether the charging module is connected with the charging equipment correctly or not according to the charging control signal, and switching off the charging module when the voltage of the charging equipment is larger than the safety charging voltage and/or the charging module is connected with the charging equipment incorrectly.

In one embodiment thereof, the charging module further comprises:

and the alarm display unit is connected with the main control module and used for generating and displaying the charging warning signal when the charging equipment is not inserted.

In one embodiment thereof, the radio frequency communication module comprises: the first radio frequency communication chip, the second radio frequency communication chip, the third radio frequency communication chip, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, the ninth capacitor, the tenth capacitor eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, eighteenth, nineteenth, twentieth, twenty-first, twenty-second, twenty-third, and/or twenty-third capacitors twenty-fourth, twenty-fifth, twenty-sixth, twenty-seventh, twenty-eighth, twenty-ninth, thirty-first, thirty-second, thirty-third, thirty-fourth, thirty-fifth, thirty-sixth, thirty-seventh, thirty-eighth, thirty-ninth, forty-first, forty-second, forty-fourth, first and second inductors;

The first end of the first capacitor and the first end of the second capacitor are commonly connected with a first radio frequency transmission pin of the first radio frequency communication chip, the second end of the first capacitor is grounded, the second end of the second capacitor and the first end of the third capacitor are commonly connected with the first end of the fourth capacitor, the second end of the third capacitor is grounded, and the second end of the fourth capacitor is the first radio frequency transmission end of the radio frequency communication module;

the first end of the fifth capacitor and the first end of the sixth capacitor are commonly connected to a second radio frequency transmission pin of the first radio frequency communication chip, the second end of the fifth capacitor is grounded, the second end of the sixth capacitor and the first end of the seventh capacitor are commonly connected to the first end of the eighth capacitor, the second end of the seventh capacitor is grounded, and the second end of the eighth capacitor is a second radio frequency transmission end of the radio frequency communication module;

the power control pin of the first radio frequency communication chip, the first end of the ninth capacitor, the first end of the tenth capacitor and the first end of the first TVS diode are commonly connected to the charging module, the second end of the ninth capacitor is grounded, the second end of the tenth capacitor is grounded, and the second end of the first TVS diode is grounded;

The first end of the twelfth capacitor and the first end of the first inductor are commonly connected to a third radio frequency transmission pin of the first radio frequency communication chip, the second end of the twelfth capacitor is grounded, the second end of the first inductor and the first end of the thirteenth capacitor are commonly connected to the first end of the fourteenth capacitor, the second end of the thirteenth capacitor is grounded, and the second end of the fourteenth capacitor is a third radio frequency transmission end of the radio frequency communication module;

the first end of the fifteenth capacitor and the first end of the second inductor are commonly connected to a fourth radio frequency transmission pin of the first radio frequency communication chip, the second end of the fifteenth capacitor is grounded, the second end of the second inductor and the first end of the sixteenth capacitor are commonly connected to the first end of the seventeenth capacitor, the second end of the sixteenth capacitor is grounded, and the second end of the seventeenth capacitor is a fourth radio frequency transmission end of the radio frequency communication module;

the first radio frequency transmission end of the radio frequency communication module, the second radio frequency transmission end of the radio frequency communication module, the third radio frequency transmission end of the radio frequency communication module and the fourth radio frequency transmission end of the radio frequency communication module are connected with the antenna;

An analog signal input pin of the first radio frequency communication chip and a first end of the eleventh capacitor are connected with an analog voltage driving signal in a sharing mode, and a second end of the eleventh capacitor is grounded;

the first end of the twenty-eighth capacitor and the first end of the twenty-seventh capacitor are commonly connected to a first control signal input pin of the first radio frequency communication chip, the second end of the twenty-seventh capacitor is grounded, the second end of the twenty-eighth capacitor and the first end of the twenty-ninth capacitor are commonly connected to a signal input pin of the second radio frequency communication chip, the second end of the twenty-ninth capacitor is grounded, the first end of the thirty-first capacitor and the first end of the thirty-first capacitor are commonly connected to a signal output pin of the second radio frequency communication chip, the second end of the thirty-first capacitor is grounded, the second end of the thirty-first capacitor and the first end of the thirty-second capacitor are commonly connected to form a first control signal input end of the radio frequency communication module, and the second end of the thirty-second capacitor is grounded;

the first end of the eighteenth capacitor and the first end of the nineteenth capacitor are commonly connected to a second control signal input pin of the first radio frequency communication chip, the second end of the eighteenth capacitor is grounded, the second end of the nineteenth capacitor and the first end of the twentieth capacitor are commonly connected to a signal input pin of the third radio frequency communication chip, the second end of the twentieth capacitor is grounded, the first end of the twenty second capacitor and the first end of the twenty first capacitor are commonly connected to a signal output pin of the third radio frequency communication chip, the second end of the twenty first capacitor is grounded, the second end of the twenty second capacitor and the first end of the twenty third capacitor are commonly connected to form a second control signal input end of the radio frequency communication module, and the second end of the twenty third capacitor is grounded;

The first control signal input end of the radio frequency communication module and the second control signal input end of the radio frequency communication module are connected with the main control module;

the first end of the twenty-fourth capacitor and the first end of the twenty-fifth capacitor are commonly connected to a first reserved communication pin of the first radio frequency communication chip, the second end of the twenty-fourth capacitor is grounded, the second end of the twenty-fifth capacitor and the first end of the twenty-sixth capacitor are commonly connected to form a first reserved communication end of the radio frequency communication module, and the second end of the twenty-sixth capacitor is grounded;

the first end of the thirty-ninth capacitor and the first end of the fortieth capacitor are commonly connected to a second reserved communication pin of the first radio frequency communication chip, the second end of the thirty-ninth capacitor is grounded, the second end of the fortieth capacitor and the first end of the fortieth capacitor are commonly connected to form a second reserved communication end of the radio frequency communication module, and the second end of the fortieth capacitor is grounded;

the first end of the forty-third capacitor and the first end of the forty-third capacitor are commonly connected to a third reserved communication pin of the first radio frequency communication chip, the second end of the forty-second capacitor is grounded, the second end of the forty-third capacitor and the first end of the forty-fourth capacitor are commonly connected to form a third reserved communication end of the radio frequency communication module, and the second end of the forty-fourth capacitor is grounded;

The first reserved communication end of the radio frequency communication module, the second reserved communication end of the radio frequency communication module and the third reserved communication end of the radio frequency communication module are connected with a mobile terminal;

a first end of the thirty-fifth capacitor, a first end of the thirty-sixth capacitor and a first power supply control pin of the first radio frequency communication chip are commonly connected with a first power supply control signal, a second end of the thirty-fifth capacitor is grounded, and a second end of the thirty-sixth capacitor is grounded;

the first end of the thirty-third capacitor, the first end of the thirty-fourth capacitor and the second power control pin of the first radio frequency communication chip are commonly connected with a second power control signal, the second end of the thirty-third capacitor is grounded, and the second end of the thirty-fourth capacitor is grounded;

a first end of the thirty-seventh capacitor, a first end of the thirty-eighth capacitor and a third power supply control pin of the first radio frequency communication chip are commonly connected with a third power supply control signal, a second end of the thirty-seventh capacitor is grounded, and a second end of the thirty-eighth capacitor is grounded;

the grounding pin of the first radio frequency communication chip is grounded.

In one embodiment thereof, the charging module comprises: the charge detection chip, the first resistor, the second resistor, the third resistor, the fourth resistor, the forty-five capacitor and the forty-six capacitor;

The first power supply detection pin of the charging detection chip and the second power supply detection pin of the charging detection chip are used for detecting whether the charging equipment is connected or not, the first end of the first resistor is connected with the first power supply detection pin of the charging detection chip and the second power supply detection pin of the charging detection chip, and the second end of the first resistor is a power supply output end of the charging module;

the power supply output end of the charging module is connected with the main control module, the radio frequency communication module and the audio power amplifier module;

the first end of the second resistor, the first end of the fourth resistor and the first end of the forty-sixth capacitor are commonly connected to an electric energy control pin of the charging detection chip, the second end of the forty-sixth capacitor is grounded, the second end of the fourth resistor and the first end of the third resistor are commonly connected to a voltage amplitude regulating signal, and the second end of the third resistor is grounded;

the second end of the second resistor, the third power supply detection pin of the charging detection chip and the first end of the forty-five capacitor are commonly connected to the main control module, and the second end of the forty-five capacitor is grounded.

In one embodiment, the audio power amplifier module includes: an audio power amplifier chip, a forty-seventh capacitor, a forty-eighth capacitor, a forty-ninth capacitor, a fifty-eighth capacitor, a fifty-first capacitor, a fifty-second capacitor, a fifty-third capacitor, a fifty-fourth capacitor, a fifty-fifth capacitor, a fifty-sixth capacitor, a second TVS diode, a third TVS diode, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a loudspeaker;

The first end of the sixth resistor and the first end of the forty-seventh capacitor are commonly connected to a positive-phase audio input pin of the audio power amplification chip, the first end of the fifth resistor and the second end of the forty-seventh capacitor are commonly connected to a negative-phase audio input pin of the audio power amplification chip, the second end of the sixth resistor is connected to the first end of the forty-eighth capacitor, the second end of the fifth resistor is connected to the first end of the forty-ninth capacitor, the second end of the forty-eighth capacitor is a first differential signal input end of the audio power amplification module, and the second end of the forty-ninth capacitor is a second differential signal input end of the audio power amplification module;

the first differential signal input end of the audio power amplifier module and the second differential signal input end of the audio power amplifier module are connected with the main control module;

the switch control pin of the audio power amplifier chip and the first end of the seventh resistor are connected with a switch control signal in a sharing way, and the second end of the seventh resistor is grounded;

the first end of the fifty-first capacitor, the first end of the fifty-first capacitor and the first grounding pin of the audio power amplifier chip are commonly grounded, the second end of the fifty-first capacitor, the first power pin of the audio power amplifier chip, the second power pin of the audio power amplifier chip and the first end of the fifty-second capacitor are commonly connected to the charging module, and the second end of the fifty-second capacitor and the second grounding pin of the audio power amplifier chip are commonly grounded;

The fifty-third capacitor is connected between a power supply pin of the audio power amplifier chip and ground;

the common mode positive output pin of the audio power amplifier chip is connected with the first end of the eighth resistor, the common mode negative output pin of the audio power amplifier chip is connected with the first end of the ninth resistor, the second end of the eighth resistor, the first end of the fifty-fifth capacitor, the first end of the fifty-fourth capacitor and the first end of the second TVS diode are connected with the positive input end of the loudspeaker in a sharing way, and the second end of the ninth resistor, the second end of the fifty-fourth capacitor, the first end of the fifty-sixth capacitor and the first end of the third TVS diode are connected with the negative input end of the loudspeaker in a sharing way;

the second end of the second TVS diode and the second end of the third TVS diode are commonly grounded;

the second terminal of the fifty-fifth capacitor and the second terminal of the fifty-sixth capacitor are commonly connected to ground.

In one embodiment, the frequency modulation module includes: a frequency modulation chip, a fifty-seventh capacitor, a fifty-eighth capacitor, a fifty-ninth capacitor, a sixty-first capacitor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor and a seventh inductor;

The first end of the fifty-seventh capacitor is an analog output end of the frequency modulation module, and the second end of the fifty-seventh capacitor is connected with a voice signal output pin of the frequency modulation chip;

the analog output end of the frequency modulation module is connected with the main control module;

the grounding pin of the frequency modulation chip is grounded;

a first end of the fifty-eighth capacitor and a first end of the third inductor are commonly connected to a power pin of the frequency modulation chip, a second end of the fifty-eighth capacitor is grounded, and a second end of the third inductor is connected to a power control signal;

the first end of the fifty-ninth capacitor is connected with the frequency modulation signal input pin of the frequency modulation chip, the second end of the fifty-ninth capacitor is connected with the first end of the fourth inductor, the second end of the fourth inductor, the first end of the sixty capacitor and the first end of the sixth inductor are commonly connected with the first end of the fifth inductor, and the second end of the sixty capacitor and the second end of the sixth inductor are commonly connected with the ground;

the second end of the fifth inductor, the first end of the sixty-first capacitor and the first end of the seventh inductor are commonly connected to form a frequency modulation signal input end of the frequency modulation module, and the second end of the sixty-first capacitor and the second end of the seventh inductor are commonly connected to the ground;

And the frequency modulation signal input end of the frequency modulation module is connected with the antenna.

A second aspect of an embodiment of the present invention provides a multifunctional machine including an antenna, and a control circuit of the multifunctional machine as described above.

A third aspect of an embodiment of the present invention provides a multi-function communication system, including: the system comprises a server, a gateway, a public communication network and at least one multifunctional machine as described above, wherein the server, the gateway, the public communication network and the multifunctional machine are sequentially connected.

The control circuit of the multifunctional machine can combine the radio frequency communication module and the NFC (Near Field Communication ) communication module to realize the radio frequency communication function and the NFC communication function with external electronic equipment, so that the control circuit of the multifunctional machine and the external electronic equipment can keep safe communication functions in various external environments to meet the communication requirements of different users, and the compatibility is extremely strong; the control circuit of the multifunctional machine adopts an audio power amplifier module to realize the processing function of audio signals so as to play audio; the working state of the main control module can be changed through the frequency modulation signal of the antenna, so that the control circuit of the multifunctional machine is in a safe and stable communication state; therefore, the control circuit of the multifunctional machine has a simplified circuit module structure, different communication modes are realized under the centralized control of the main control module, the characteristics of 2G communication and 4G communication are compatible, the communication function is complete, the operation is simple and convenient, the control circuit is applicable to various communication environments, great convenience is brought to the use of users, and the communication quality and the communication stability between the control circuit of the multifunctional machine and external electronic equipment are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a control circuit of a multifunctional machine according to an embodiment of the present invention;

fig. 2 is a schematic diagram of another structure of a control circuit of the multifunctional machine according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a charging module according to an embodiment of the invention;

fig. 4 is a schematic structural diagram of a charging module according to an embodiment of the invention;

fig. 5 is a schematic circuit diagram of a radio frequency communication module according to an embodiment of the invention;

fig. 6 is a schematic circuit diagram of a charging module according to an embodiment of the invention;

fig. 7 is a schematic circuit diagram of an audio power amplifier module according to an embodiment of the invention;

fig. 8 is a schematic circuit diagram of a frequency modulation module according to an embodiment of the invention;

Fig. 9 is a schematic circuit diagram of an NFC communication module according to an embodiment of the present invention;

fig. 10 is a schematic circuit diagram of an overvoltage protection module according to an embodiment of the invention;

FIG. 11 is a schematic diagram of a multifunctional machine according to an embodiment of the present invention

Fig. 12 is a schematic structural diagram of a multifunctional communication system according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1, a schematic structural diagram of a control circuit 10 of a multifunctional machine according to an embodiment of the present invention is provided, wherein a plurality of communication functions are implemented between the control circuit 10 and external electronic devices, the compatibility is strong, and the communication quality and the communication efficiency are kept high in different communication environments, so that great convenience is brought to users; for convenience of explanation, only the portions related to the present embodiment are shown, and the detailed description is as follows:

the control circuit 10 includes: the device comprises a main control module 101, a radio frequency communication module 102, an audio power amplifier module 103, a frequency modulation module 104, a charging module 105 and an NFC communication module 106.

The main control module 101 is configured to generate a radio frequency communication signal, an audio signal, and a charging control signal according to a charging detection signal.

The main control module 101 can realize a centralized control function in the control circuit 10 of the multifunctional machine, so that all circuit modules in the control circuit 10 can realize a cooperative and complete circuit function, and the control precision and the control stability of the control circuit 01 are improved; specifically, the radio frequency communication signal includes communication information of the control circuit 10, the audio information includes voice information, and the charging control signal includes electric energy driving information; furthermore, the present embodiment can implement different communication control functions through the main control module 101, thereby improving the application range and operability of the control circuit 10.

The radio frequency communication module 102 is connected to the antenna 20 and the main control module 101, and is configured to receive a radio frequency signal sent by the antenna 20, perform filtering processing, amplifying processing, mixing processing, and demodulation processing on the radio frequency signal to obtain an analog control signal, and perform encryption processing, modulation processing, filtering processing, and amplifying processing on the radio frequency communication signal, and output the signal to the antenna 20.

Optionally, the radio frequency communication module 102 and the antenna 20 adopt a wireless communication mode to realize a radio frequency communication function; optionally, the radio frequency communication frequency of the radio frequency communication module 102 is: 300 KHz-30 GHz; the radio frequency signal can keep complete electromagnetic frequency in the space transmission process, so that long-distance transmission performance is formed, and further, the radio frequency communication module 102 and the antenna 20 have higher signal interaction performance; on the one hand, when the antenna 20 sends out the radio frequency signal, the noise component can be eliminated by filtering the radio frequency signal, so that the frequency integrity of the radio frequency signal is ensured; the accuracy of radio frequency communication can be increased through amplification processing, and the loss or distortion of radio frequency communication information is avoided; the multi-channel radio frequency information can be compatible through frequency mixing, so that the communication efficiency of radio frequency signals is maintained; the signal form of the radio frequency information can be changed through demodulation processing, so that an analog control signal can be directly processed by the main control module 101, and the efficiency of radio frequency communication and the accuracy of signal transmission are accelerated; on the other hand, when the main control module 101 sends out the radio frequency communication signal, the radio frequency communication signal carries baseband communication information, and the security level of the communication information can be improved by carrying out encryption processing on the radio frequency communication signal, so that the radio frequency communication information is prevented from being stolen in the transmission process; the signal transmission form of the radio frequency communication information can be converted through modulation processing, and the radio frequency communication signal after modulation processing can be applicable to different signal transmission channels; the filtering processing can keep the integrity of radio frequency information in the radio frequency communication signals; the amplification processing can improve the accuracy and precision of the radio frequency communication signal, so that the antenna 20 can receive complete radio frequency communication information, and the communication control quality and control effect of the main control module 101 are ensured; therefore, the rf communication module 102 in this embodiment can combine the analog control signal and the rf communication signal to realize the function of signal bidirectional transmission with the antenna 20, so that the quality of rf communication is better, and the control circuit 10 and the external electronic device maintain the complete communication function, and the rf communication module 102 and the antenna 20 maintain the safe signal transmission function in various external communication environments.

The audio power amplifier module 103 is connected with the main control module 101 and is used for amplifying, preventing sound breaking and filtering the audio signal.

The audio power amplifier module 103 has an audio playing function, so as to meet the hearing requirement of a user and improve the signal processing performance and compatibility of the control circuit 10 of the multifunctional machine; when the audio signal is output, the user can acquire clear language information in real time; specifically, the power amplification gain of the audio signal can be automatically adjusted according to the power of the audio signal through the anti-cracking sound, the audio signal after the anti-cracking sound processing and the filtering processing of the amplification processing can realize more comfortable hearing feeling, and a user can acquire clearer and complete voice information; the audio power amplifier module 103 can realize the selection function of different audio signal output modes, so that the compatibility of the control circuit 10 of the multifunctional machine is improved; illustratively, when the amplification gain of the audio power amplifier module 103 for the audio signal is 12dB, there is no anti-sound breaking function; when the amplification gain of the audio power amplifier module 103 to the audio signal is 16dB, starting the sound breaking prevention function; when the amplification gain of the audio power amplification module 103 to the audio signal is 24dB, the audio power amplification module has no sound breaking prevention function; when the amplification gain of the audio power amplifier module 103 to the audio signal is 27.5dB, starting the sound breaking prevention function; furthermore, the audio power amplifier module 103 has strong operability, and the control circuit 10 can output different types of audio signals according to the actual requirements of technicians, so that good hearing experience is brought to users.

The frequency modulation module 104 is connected to the antenna 20 and the main control module 101, and is configured to perform filtering, amplifying, mixing and demodulation on the frequency modulated signal output by the antenna 20 to generate an analog voice signal.

Optionally, the frequency modulation module 104 is in wireless communication connection with the antenna 20, and the frequency band of the control circuit 10 can be changed in real time through the frequency modulation signal, so that the frequency band of the control circuit 10 is communicated with the antenna 20, and the control circuit 10 and the antenna 20 have higher excellent signal transmission quality, so that the communication mode of the control circuit 10 has higher adjustability and controllability; when the antenna 20 outputs the frequency modulation signal to the frequency modulation module 104, the analog voice signal after the filtering process, the amplifying process, the mixing process and the demodulation process has higher signal transmission quality and transmission precision, the analog voice signal can be completely compatible and recognized by the main control module 101, and then the internal frequency of the main control module 101 is changed through the analog voice signal, so that the main control module 101 can always keep a safe and stable communication state, the communication quality and communication compatibility between the main control module 101 and the antenna 20 are improved, the communication process between the control circuit 10 and the antenna 20 can be compatible and applicable to different external environments, the communication mode of the control circuit 10 has higher adjustability, and the communication flexibility of the control circuit 10 is higher.

The charging module 105 is connected with the main control module 101, the radio frequency communication module 102 and the audio power amplifier module 103, and is configured to generate a charging detection signal when detecting that the charging device 30 is inserted, feed back the charging detection signal to the main control module 101, and perform charging according to the charging control signal.

Alternatively, if the charging device 30 is not inserted into the charging module 105, the charging module 105 does not generate the charging detection signal, and the charging module 105 does not complete the preliminary work before charging, and the main control module 101 cannot control the charging module 105 to perform charging, so as to prevent the charging failure of the control circuit 10.

The charging module 105 can be connected with electric energy to realize the charging control function of the control circuit 10, so that the electric energy supply accuracy and control flexibility of the control circuit 10 are improved; for example, if the charging module 105 is connected to an external dc power supply, and the charging device 30 is plugged into the charging module 105, the main control module 101 may access dc power in real time to maintain a stable circuit control state; the present embodiment can accurately derive the physical connection state between the charging module 105 and the charging device 30 through the charging detection signal; if the physical connection between the charging module 105 and the charging device 30 is successfully achieved, it indicates that the charging module 105 has met the safe charging condition, the charging module 105 informs the main control module 101 through the charging detection signal, the main control module 101 enters the charging control state according to the charging detection signal, the main control module 101 transmits the charging control signal to the charging module 105, the charging state of the charging module 105 can be directly changed through the charging control signal, the main control module 101 can directly control the power transmission state of the charging module 105, the control circuit 10 of the multifunctional machine has higher charging flexibility and charging stability, the control circuit 10 has higher power transmission safety through the charging module 101, the charging module 105 and the main control module 101 can maintain higher signal communication efficiency, and the charging efficiency of the control circuit 10 of the multifunctional machine is improved.

The NFC communication module 106 is connected to the main control module 101, and is configured to perform NFC communication with the card reader 40.

The card reader 40 contains pre-stored functional data, the NFC communication can realize non-contact point-to-point data transmission between electronic components, in the NFC communication mode, a signal transmission channel can be established between the NFC communication module 106 and the card reader 40, the main control module 101 can read information in the card reader 40 in real time, and then the control circuit 10 of the multifunctional machine and the card reader 40 can directly exchange information, access content and communication service; therefore, the NFC communication module 106 in this embodiment can maintain the security and compatibility of signal transmission between the control circuit 10 of the multifunctional machine and the card reader 40, so as to avoid interference caused by external noise to the communication process between the control circuit 10 of the multifunctional machine and the card reader 40; the NFC communication module 106 in this embodiment can maintain higher communication quality and communication security with the card reader 40 in various communication environments, and can implement a peer-to-peer communication function between the control circuit 10 and the card reader 40, so that higher signal transmission efficiency and signal transmission security between the NFC communication module 106 and the card reader 40 are ensured; the control circuit 10 of the multifunctional machine has high compatibility and signal transmission quality.

In the structure of the control circuit 10 of the multifunctional machine shown in fig. 1, the control circuit 10 has a simplified circuit module structure, under the centralized control of the main control module 101, a stable radio frequency communication function can be realized between the radio frequency communication module 102 and the antenna 20, NFC communication can be performed between the radio frequency communication module 106 and the card reader 40, and further the control circuit 10 has two communication modes, so that a stable and safe data communication function between the multifunctional machine and external electronic equipment can be realized, and further the control circuit 10 has a complete signal communication mode, and in various different communication environments, the control circuit 10 can maintain stable data interaction performance so as to meet various communication function requirements of users, and has extremely strong compatibility; in addition, the audio playing function can be realized through the audio power amplifier module 103, so that good use experience is brought to users, the frequency band of the main control module 101 can be adjusted through the frequency modulation module 104, so that data interaction between the main control module 101 and external electronic equipment is performed in an optimal frequency band, the communication state of the control circuit 10 is more flexible and controllable, and the application range is wider; therefore, the control circuit 10 in this embodiment can realize different data communication modes according to the use needs of technicians, the communication modes have diversity, the data transmission process between the control circuit 10 and the external electronic device has higher data integrity, the operability is extremely strong, the characteristics of different communication modes are compatible, and the functions are complete; the control circuit 10 is compatible with 2G and 4G communication modes at the same time, has complete functions, and effectively solves the problems that the communication mode of the communication equipment in the traditional technology is single, various communication requirements of users cannot be met, the traditional communication equipment can only transmit data in a specific communication mode, the operability is not strong, and the practical value is low.

Optionally, the charging device 30 is connected to a mains supply, where the mains supply contains a larger ac power, and the mains supply can ensure that the control circuit 10 is connected to a stable power and maintains a normal working state, and the main control module 101 has a higher power supply stability; therefore, the control circuit 10 in this embodiment is applicable to the consumer's domestic power system, and the compatibility of power is extremely high, and the control circuit 10 keeps the normal signal interaction state in various power systems, has brought very big convenience for the consumer's use, and application flexibility is higher.

Optionally, the main control module 101 includes a single chip microcomputer chip, and the single chip microcomputer chip is an STM32 series, and implements a centralized communication control function through the single chip microcomputer chip, so that the control circuit 10 has higher communication compatibility with external electronic devices; therefore, the main control module 101 in this embodiment can realize a centralized control function, and is simple and convenient to operate, and the signal transmission process between the control circuit 10 and the electronic device has flexible controllability and stronger operability.

As an alternative implementation, fig. 2 shows another schematic structure of the control circuit 10 provided in this embodiment, and, compared to the schematic structure of the control circuit 10 in fig. 1, the control circuit 10 in fig. 2 further includes an overvoltage protection module 107.

The overvoltage protection module 107 is connected to the charging module 105, and is configured to perform overvoltage protection on the charging module 105 when the charging voltage of the charging module 105 is greater than a preset safety voltage.

The overvoltage protection module 107 can prevent the power accessed by the circuit in the control circuit 10 from being in an overvoltage state, so that the power transmission safety of the control circuit 10 is damaged; it should be noted that, the preset safety voltage is the maximum allowable access voltage of the control circuit 10, and the preset safety voltage is 240V, which is an example, and the control circuit 10 can be in a rated operation state through the overvoltage protection module 107; after the charging device 30 is inserted into the charging module 105, the charging module 105 is in a charged state; the charging power output by the charging device 30 is extremely unstable, such as if the voltage of the commercial power connected with the charging module 105 fluctuates greatly, or the commercial power is suddenly cut off or turned on, the charging device 30 outputs an instant high voltage, and the charging voltage of the charging module 105 is greater than a preset safety voltage, the charging process of the control circuit 10 is interrupted by disconnecting the charging module 105 from the charging device 30 through the overvoltage protection module 107, the high voltage output by the charging device 30 is shorted to the ground, and thus various electronic components in the control circuit 10 are prevented from being damaged by the high voltage; therefore, the overvoltage protection module 107 in this embodiment can make the charging voltage of the charging module 105 always in a safe rated state, the control circuit 10 can access the electric energy and maintain in a stable communication state, the control circuit 10 has higher communication security, the user experience is better, and the practical value is extremely high.

As an alternative implementation, fig. 3 shows a schematic structural diagram of the charging module 105 provided in this embodiment, referring to fig. 3, the charging module 105 includes: a sampling unit 1051, a status display unit 1052, and a security detection unit 1053.

The sampling unit 1051 is connected to the main control module 101, and is configured to collect a charging voltage of the charging module 105 according to a charging control signal to obtain a sampling signal.

Optionally, the sampling signal includes a charging voltage and a charging current of the charging module 101, and after the charging module 105 establishes a physical connection with the charging device 30, the charging module 105 may access stable electric energy through the charging device 30 to maintain the control circuit 10 in a safe and stable communication state; under the centralized control of the main control module 101, the charging state of the charging module 105 can be obtained in real time through the sampling unit 1051, so that the charging state of the control circuit 10 is prevented from being abnormal; therefore, the charging state of the charging module 105 can be obtained in real time by the sampling signal output by the sampling unit 1051, the charging process of the charging module 105 has higher safety and control flexibility, the charging module 105 can maintain the safe charging state in various power systems, and the control circuit 10 has higher continuous communication safety.

The status display unit 1052 is connected to the sampling unit 1051 and the main control module 101, and is configured to display charging status information of the charging module 105 according to the sampling signal.

When the sampling unit 1051 finishes sampling the charging voltage of the charging module 105, the sampling signal obtained by sampling the sampling unit 1051 contains various sampling data, and the charging state information of the charging module 105 can be obtained after processing and analyzing the sampling data; for example, after the sampled data sampled by the sampling unit 1051 is analyzed, whether the charging voltage of the charging module 105 is in a fluctuating state or not can be obtained, and further, the real-time monitoring of the charging process of the charging module 105 can be realized through a sampling signal; in this embodiment, the state display unit 1052 has an information display function, and when the sampling unit 1051 outputs a sampling signal to the state display unit 1052, the state display unit 1052 can completely analyze sampling data in the sampling signal to display the charging state information of the charging module 105 in all directions; therefore, the technician can more intuitively acquire the charging state of the charging module 105 through the state display unit 1052, so as to accurately control the communication process of the control circuit 10, improve the control sensitivity of the charging state of the control circuit 10, ensure the charging safety performance of the control circuit 10, and bring better use experience to the user.

The safety detection unit 1053 is connected to the main control module 101, and is configured to detect whether the voltage of the charging device 30 is greater than a safe charging voltage according to the charging control signal, and detect whether the charging module 105 is connected to the charging device 30 correctly, and turn off the charging module when the voltage of the charging device 30 is greater than the safe charging voltage and/or the charging module 105 is connected to the charging device 30 incorrectly.

Specifically, when the voltage of the charging device 30 is less than or equal to the safe charging voltage and/or the charging module 105 is properly connected to the charging device 30, the safety detection unit 1053 maintains the charging state of the charging module 105; if the charging module 105 and the charging device 30 implement a safe power transmission process, the control circuit 10 can access stable power in real time to maintain a normal working state, and the control circuit 10 has high communication reliability and safety.

The safe charging voltage is a safe threshold value of the charging device 30, and the charging device 30 can be in a safe power supply state only when the voltage of the charging device 30 is less than or equal to the safe threshold value, and electric energy is output to the control circuit 10 through the charging device 30 so as to maintain a safe communication state of the control circuit 10; in contrast, if the voltage of the charging device 30 is in the overvoltage operation state, the charging device 30 will suffer a large loss, and even burn the charging device 30 completely, and the power supply process of the charging device 30 needs to be stopped at this time; since the physical connection state between the charging module 105 and the charging device 30 has a great influence on the charging state of the control circuit 10, for example, if the charging module 105 is connected to the charging device 30 by a cable, when the cable is broken, the charging process of the charging module 105 may have a leakage risk; or because the power transmission channels between the charging module 105 and the charging device 40 are diversified, a connector matched with each power transmission channel is arranged in the charging module 105, if the physical connection mode between the charging module 105 and the charging device 40 is incorrect, abnormal power is accessed to the control circuit 10, and the physical safety of the charging module 10 is damaged; therefore, in this embodiment, when the voltage of the charging device 40 is in an abnormal condition and the connection mode of the charging device 40 is incorrect, the charging state of the charging module 105 is cut off when any one of the two conditions occurs, so as to ensure the safety and physical safety of the power transmission of the control circuit 10, and the charging device 40 can always output stable power to the charging module 105, so as to improve the charging efficiency of the control circuit 10; the safety detection unit 1053 of the present embodiment ensures the safety of the power transmission of both the charging module 105 and the charging device 40, and the control circuit 10 can be in a more stable communication state for a long period of time, so that the practical value is extremely high.

As an alternative implementation, fig. 4 shows a schematic structural diagram of the charging module 105 provided in this embodiment, and, compared to the charging module 105 in fig. 3, the charging module 105 in fig. 4 further includes an alarm display unit 1054.

The alarm display unit 1054 is connected to the main control module 101, and is configured to generate and display a charging alarm signal when the charging device 30 is not inserted.

Specifically, when the charging device 30 is not inserted into the charging module 105, the alarm display unit 1054 may real-time the physical connection state of the charging module 105 and the charging device 30, so that the control circuit 10 has a higher application range and communication efficiency.

The charging warning signal includes a warning message that the charging device 301 is not connected, and according to the charging warning signal, a technician can acquire that the charging module 105 and the charging device 30 are not in a connection state, so that the physical connection information of the charging module 105 and the charging device 30 can be monitored more accurately through the alarm display unit 1054, and the charging state of the charging module 105 has higher operability and flexibility; the charging efficiency of the control circuit 10 can be improved through the charging alarm signal displayed by the alarm display unit, and the control circuit 10 is prevented from being in a stop state for a long time; the control circuit 10 can meet various use requirements of users, brings great convenience to the use of the users, can keep a stable communication state for a long time between the control circuit 10 and external electronic equipment, and has higher compatibility.

As an alternative implementation manner, fig. 5 shows a schematic circuit structure of the radio frequency communication module 102 provided in this embodiment, referring to fig. 5, the radio frequency communication module 102 includes: the first radio frequency communication chip U1, the second radio frequency communication chip U2, the third radio frequency communication chip U3, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12, the thirteenth capacitor C13, the fourteenth capacitor C14, the fifteenth capacitor C15, the sixteenth capacitor C16, the seventeenth capacitor C17, the eighteenth capacitor C18, the nineteenth capacitor C19, the twenty-first capacitor C21, the twenty-second capacitor C22, the twenty-third capacitor C23, the twenty-fourth capacitor C24, the twenty-fifth capacitor C25, the twenty-sixth capacitor C26, the twenty-seventh capacitor C27, the eighth capacitor C28, the twenty-ninth capacitor C29, the thirty-third capacitor C30, the thirty-first capacitor C31, the thirty-second capacitor C32, the thirty-third capacitor C33, the thirty-fourth capacitor C33, the fortieth capacitor C34, the fortieth capacitor C35, the thirty-fourth capacitor C33, the thirty-fourth capacitor C40, the thirty-fourth capacitor C1, the fortieth capacitor C35, the thirty-fourth capacitor C1, the fortieth capacitor C33.

The first end of the first capacitor C1 and the first end of the second capacitor C2 are commonly connected to the first radio frequency transmission pin rfn_l1 of the first radio frequency communication chip U1, the second end of the first capacitor C1 is grounded GND, the second end of the second capacitor C2 and the first end of the third capacitor C3 are commonly connected to the first end of the fourth capacitor C4, the second end of the third capacitor C3 is grounded GND, and the second end of the fourth capacitor C4 is the first radio frequency transmission end of the radio frequency communication module 102.

The first end of the fifth capacitor C5 and the first end of the sixth capacitor C6 are commonly connected to the second radio frequency transmission pin rfn_m of the first radio frequency communication chip U1, the second end of the fifth capacitor C5 is grounded GND, the second end of the sixth capacitor C6 and the first end of the seventh capacitor C7 are commonly connected to the first end of the eighth capacitor C8, the second end of the seventh capacitor C7 is grounded GND, and the second end of the eighth capacitor C8 is the second radio frequency transmission end of the radio frequency communication module 102.

The power control pin VBAT1 of the first radio frequency communication chip U1, the first end of the ninth capacitor C9, the first end of the tenth capacitor C10, and the first end of the first TVS diode T1 are commonly connected to the charging module 105, the second end of the ninth capacitor C9 is grounded GND, the second end of the tenth capacitor C10 is grounded GND, and the second end of the first TVS diode T1 is grounded GND.

The first TVS diode T1 has the functions of preventing surge and preventing transient high voltage impact, when the charging module 105 transmits electric energy to the main control module 101, the first radio frequency communication chip U1 can access the electric energy and maintain a stable working state, so that the transient high voltage output by the charging module 105 is prevented from damaging the physical safety of the first radio frequency communication chip U1, the first radio frequency communication chip U1 can be always in a safe and stable communication state, the first radio frequency communication chip U1 can access the safe electric energy through the power control pin VBAT1, the control reliability of the first radio frequency communication chip U is improved, and the radio frequency communication module 102 has higher electric energy supply safety and compatibility.

The first end of the twelfth capacitor C12 and the first end of the first inductor L1 are commonly connected to the third radio frequency transmission pin rfn_h of the first radio frequency communication chip U1, the second end of the twelfth capacitor C12 is grounded GND, the second end of the first inductor L1 and the first end of the thirteenth capacitor C13 are commonly connected to the first end of the fourteenth capacitor C14, the second end of the thirteenth capacitor C13 is grounded GND, and the second end of the fourteenth capacitor C14 is the third radio frequency transmission end of the radio frequency communication module 102.

The first end of the fifteenth capacitor C15 and the first end of the second inductor L2 are commonly connected to the fourth rf transmission pin HBRX2 of the first rf communication chip U1, the second end of the fifteenth capacitor C15 is grounded GND, the second end of the second inductor L2 and the first end of the sixteenth capacitor C16 are commonly connected to the first end of the seventeenth capacitor C17, the second end of the sixteenth capacitor C16 is grounded GND, and the second end of the seventeenth capacitor C17 is the fourth rf transmission end of the rf communication module 102.

The first rf transmission end of the rf communication module 102, the second rf transmission end of the rf communication module 102, the third rf transmission end of the rf communication module 102, and the fourth rf transmission end of the rf communication module 102 terminate the antenna 20; the radio frequency communication module 102 in this embodiment maintains a radio frequency communication state with the antenna 20 through each radio frequency transmission end, a higher signal transmission function is provided between the radio frequency communication module 102 and the antenna 20, after the radio frequency communication module 102 processes a communication signal between the main control module 101 and the antenna 20, the communication quality between the control circuit 10 and the antenna 20 is improved, and the radio frequency communication module 102 can maintain a complete signal transmission function in each communication environment, so that the communication compatibility of the control circuit 10 and the use experience of a user are improved.

The analog signal input pin VIO of the first radio frequency communication chip U1 and the first end of the eleventh capacitor C11 are commonly connected to an analog voltage driving signal, and the second end of the eleventh capacitor C11 is grounded GND; the eleventh capacitor C11 is a decoupling capacitor, and the internal electronic components of the first radio frequency communication chip U1 can be ensured to be in a rated running state through an analog voltage driving signal; for example, the internal power amplitude of the first rf communication chip U1 may be changed in real time by simulating the level state of the voltage driving signal, so that the first rf communication chip U1 is in a safer communication control state.

The first end of the twenty-eighth capacitor C28 and the first end of the twenty-seventh capacitor C27 are commonly connected to the first control signal input pin HB1 of the first radio frequency communication chip U1, the second end of the twenty-seventh capacitor C27 is grounded GND, the second end of the twenty-eighth capacitor C28 and the first end of the twenty-ninth capacitor C29 are commonly connected to the signal input pin IN of the second radio frequency communication chip U2, the second end of the twenty-ninth capacitor C29 is grounded GND, the first end of the thirty-first capacitor C30 and the first end of the thirty-first capacitor C31 are commonly connected to the signal output pin OUT of the second radio frequency communication chip U2, the second end of the thirty-first capacitor C30 is grounded GND, the second end of the thirty-first capacitor C31 and the first end of the thirty-second capacitor C32 are commonly connected to the first control signal input end of the radio frequency communication module 102, and the second end of the thirty-second capacitor C32 is grounded GND.

The first end of the eighteenth capacitor C18 and the first end of the nineteenth capacitor C9 are commonly connected to the second control signal input pin HB4 of the first radio frequency communication chip U1, the second end of the eighteenth capacitor C18 is grounded GND, the second end of the nineteenth capacitor C19 and the first end of the twentieth capacitor C20 are commonly connected to the signal input pin IN of the third radio frequency communication chip U3, the second end of the twentieth capacitor C20 is grounded GND, the first end of the twenty second capacitor C22 and the first end of the twenty first capacitor C21 are commonly connected to the signal output pin OUT of the third radio frequency communication chip U3, the second end of the twenty first capacitor C21 is grounded GND, the second end of the twenty second capacitor C22 and the first end of the twenty third capacitor C23 are commonly connected to the second control signal input end of the radio frequency communication module 102, and the second end of the twenty third capacitor C23 is grounded GND.

The first control signal input end of the radio frequency communication module 102 and the second control signal input end of the radio frequency communication module 102 are connected with the main control module 101; the radio frequency communication module 102 realizes a signal communication function with the main control module 101 through each control signal input end, the first radio frequency communication chip U1 can send analog control signals and receive radio frequency communication signals, the second radio frequency communication chip U2 and the third radio frequency communication chip U3 can ensure that the radio frequency communication module 102 and the main control module 101 have higher communication compatibility and signal transmission stability, and the radio frequency communication module 102 can keep good communication information integrity under the control of the main control module 101, so that the application range is wider; the communication state between the antenna 20 and the control circuit 10 can meet the actual demands of different users, and the communication between the control circuit 10 and the antenna 20 can be kept at a better level.

The first end of the twenty-fourth capacitor C24 and the first end of the twenty-fifth capacitor C25 are commonly connected to the first reserved communication pin HB2 of the first radio frequency communication chip U1, the second end of the twenty-fourth capacitor C24 is grounded GND, the second end of the twenty-fifth capacitor C25 and the first end of the twenty-sixth capacitor C26 are commonly connected to form the first reserved communication end of the radio frequency communication module 102, and the second end of the twenty-sixth capacitor C26 is grounded GND.

The first end of the thirty-ninth capacitor C39 and the first end of the fortieth capacitor C40 are commonly connected to the second reserved communication pin MB4 of the first radio frequency communication chip U1, the second end of the thirty-ninth capacitor C39 is grounded GND, the second end of the fortieth capacitor C40 and the first end of the fortieth capacitor C41 are commonly connected to form the second reserved communication end of the radio frequency communication module 102, and the second end of the fortieth capacitor C41 is grounded GND.

The first end of the forty-two capacitor C42 and the first end of the forty-three capacitor C43 are commonly connected to the third reserved communication pin MB3 of the first radio frequency communication chip U1, the second end of the forty-two capacitor C42 is grounded GND, and the second end of the forty-three capacitor C43 and the first end of the forty-four capacitor C44 are commonly connected to form the third reserved communication end of the radio frequency communication module 102, and the second end of the forty-four capacitor C44 is grounded GND.

The first reserved communication end of the radio frequency communication module 102, the second reserved communication end of the radio frequency communication module 102 and the third reserved communication end of the radio frequency communication module 102 are connected with the mobile terminal; optionally, the mobile terminal is a mobile phone or a computer, and further the radio frequency communication module 102 realizes a more compatible communication function through the reserved communication end, and the communication state of the radio frequency communication module 102 can be directly changed through the operation instruction sent by the mobile terminal, so that the communication state of the control circuit 10 has higher operability and flexibility, and the use experience of a user is better.

The first end of the thirty-fifth capacitor C35, the first end of the thirty-sixth capacitor C36 and the first power control pin of the first radio frequency communication chip U1 are commonly connected with a first power control signal, the second end of the thirty-fifth capacitor C35 is grounded GND, and the second end of the thirty-sixth capacitor C36 is grounded GND; the radio frequency communication function of the first radio frequency communication chip U1 can be in a working or stopping state by the first power control signal, so that the communication control flow of the radio frequency communication module 102 is simplified.

The first end of the thirty-third capacitor C33, the first end of the thirty-fourth capacitor C34 and the second power control pin of the first radio frequency communication chip U1 are commonly connected to the second power control signal, the second end of the thirty-third capacitor C33 is grounded GND, and the second end of the thirty-fourth capacitor C34 is grounded GND.

The first end of the thirty-seventh capacitor C27, the first end of the thirty-eighth capacitor C38 and the third power supply control pin VCC2_2 of the first radio frequency communication chip U1 are commonly connected with a third power supply control signal, the second end of the thirty-seventh capacitor C37 is grounded GND, and the second end of the thirty-eighth capacitor C38 is grounded GND; furthermore, in this embodiment, the communication state of the first radio frequency communication chip U1 can be controlled in real time by combining the first power control signal, the second power control signal and the third power control signal, so that the communication state of the control circuit 10 has higher control stability and a wider application range.

The ground pin of the first radio frequency communication chip U1 is grounded GND.

As an optional real-time manner, the model number of the first radio frequency communication chip U1 is U3202, U3204 or U3205; the model of the second radio frequency communication chip U2 is U3202, U3204 or U3205; the model of the third radio frequency communication chip U3 is U3202, U3204 or U3205; the radio frequency communication module 102 in this embodiment can implement a more stable radio frequency communication function through each radio frequency communication chip, and has a higher communication quality between the control circuit 10 and the antenna 20.

As an alternative implementation, fig. 6 shows a schematic circuit structure of the charging module 105 provided in this embodiment, referring to fig. 6, the charging module 105 includes: the charge detection chip U4, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the forty-five capacitor C45, and the forty-six capacitor C46.

The first power supply detection pin of the charging detection chip U4 and the second power supply detection pin of the charging detection chip U4 are used for detecting whether the charging device 30 is connected or not, the first end of the first resistor R1 is connected with the first power supply detection pin of the charging detection chip U4 and the second power supply detection pin of the charging detection chip, and the second end of the first resistor R1 is a power supply output end of the charging module 105.

The power output end of the charging module 105 is connected with the main control module 101, the radio frequency communication module 102 and the audio power amplifier module 103; the physical connection state between the charging device 30 and the charging module 105 can be accurately detected in real time through the power supply detection pin of the charging detection chip U4, and then when the charging device 30 is inserted into the charging module 105, electric energy is output to the main control module 101, the radio frequency communication module 102 and the audio power amplifier module 103 through the charging module 105, the charging module 105 has higher detection sensitivity and precision for the electric energy transmission state of the charging device 30, and the control circuit 10 has higher charging safety and applicability.

The first end of the second resistor R2, the first end of the fourth resistor R4 and the first end of the forty-sixth capacitor C46 are commonly connected to the electric energy control pin of the charging detection chip U4, the second end of the forty-sixth capacitor C46 is grounded GND, the second end of the fourth resistor R4 and the first end of the third resistor R3 are commonly connected to a voltage amplitude regulating signal, and the second end of the third resistor R3 is grounded GND; the internal voltage operation condition of the charging detection chip U4 can be changed through the voltage amplitude adjusting signal, so that the charging module 105 is always kept in a safe electric energy operation state, the main control module 101 is connected into more stable electric energy through the charging module 105, and the electric energy transmission safety of the control circuit 10 is improved. The control circuit 10 can maintain a more stable communication state.

The second end of the second resistor R2, the third power supply detection pin of the charging detection chip U4 and the first end of the forty-five capacitor C45 are commonly connected to the main control module 101, and the second end of the forty-five capacitor C45 is grounded GND; after the physical connection between the charging module 105 and the charging device 30 is successful, the charging module 105 notifies the main control module 101 of the physical connection state, and the charging detection chip U4 is controlled by the main control module 101 to start charging, the charging detection chip U4 can be connected into electric energy in real time, the charging module 105 further has higher charging efficiency, the main control module 101 can change the charging state of the charging detection chip U4 in real time, the electric energy connection state of the control circuit 10 has higher operability, and the charging module 105 provides rated electric energy for each circuit module.

As an alternative embodiment, the model of the charging detection chip U4 is MC2539; therefore, the charging module 105 in this embodiment realizes the functions of physical connection state detection and power transmission control through the charging detection chip U4, the power transmission state of the control circuit 10 has higher control flexibility and charging state stability, and the control circuit 10 can maintain the communication function with better quality.

In order to better explain the working principle of the charging module 105 in this embodiment, the charging control process of the control circuit 10 is described below with reference to fig. 3, 4 and 6, and specifically, the charging process of the charging module 105 can be divided into three states: a precharge phase, a constant current charging phase and a constant voltage charging phase.

1. A precharge phase: the voltage output by the charging module 105 is less than 3.3V, the voltage lower than 3.3V cannot enable the main control module 101 to be in a working state, the control circuit 10 is in a shutdown state, and the control circuit 10 cannot realize a communication function; the electric energy amplitude in the precharge stage is low, the charging state of the main control module 101 is not greatly related to the voltage amplitude output by the charging module 105, and the main control module 101 is connected with weak electric energy to be formally in a working state; by lowering the resistance between the charging module 105 and the charging device 30, the precharge function of the charging module 105 can be realized, and the state of charge of the control circuit 10 can be maintained stable by precharge.

2. Constant current charging stage: the voltage output by the charging module 105 is greater than or equal to 3.3V and less than 4.2V, the voltage output by the charging module 105 is already greater than the working voltage of the main control module 101, the main control module 101 keeps a stable working state, and the main control module 101 continuously accesses electric energy and realizes a communication control function; therefore, in the constant current charging stage, the main control module 101 is in a rated power supply state, information interaction is performed between the control circuit 10 and external electronic equipment, and the control circuit 10 has higher communication efficiency.

3. Constant voltage charging phase: the voltage output by the charging module 105 is greater than or equal to 4.2V, at this time, the charging current of the main control module 101 gradually decreases, but the voltage output by the charging module 105 remains unchanged; when the charging current of the main control module 101 is reduced to be close to 0V, the main control module 101 outputs a charging control signal to the charging module 105, the charging module 105 stops charging by the charging control signal, the charging process of the control circuit 10 is ended, and the information interaction between the control circuit 10 and the electronic device is also ended; therefore, the control circuit 10 can maintain high electric energy safety in the constant voltage charging stage to complete the safe power supply function of the control circuit 10, and the control circuit 10 can be in a rated working state.

Therefore, in the embodiment, the charging module 105 can output the electric energy with different magnitudes to the main control module 101, the electric energy supply state of the charging module 105 has higher flexibility and compatibility, and each circuit module in the control circuit 10 has good power supply safety, so that the physical safety of each electronic component in the control circuit 10 is ensured.

As an alternative implementation manner, fig. 7 shows a schematic circuit structure of the audio power amplifier module 103 provided in this embodiment, referring to fig. 7, the audio power amplifier module 103 includes: the audio power amplifier chip U5, the forty-seventh capacitor C47, the forty-eighth capacitor C48, the forty-ninth capacitor C49, the fifty-third capacitor C50, the fifty-first capacitor C51, the fifty-second capacitor C52, the fifty-third capacitor C53, the fifty-fourth capacitor C54, the fifty-fifth capacitor C55, the fifty-sixth capacitor C56, the second TVS diode T2, the third TVS diode T3, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the horn LS.

The first end of the sixth resistor R6 and the first end of the forty-seventh capacitor C47 are commonly connected to a positive-phase audio input pin INP of the audio power amplification chip U5, the first end of the fifth resistor R5 and the second end of the forty-seventh capacitor C47 are commonly connected to a negative-phase audio input pin INN of the audio power amplification chip U5, the second end of the sixth resistor R6 is connected to the first end of the forty-eighth capacitor C48, the second end of the fifth resistor R5 is connected to the first end of the forty-ninth capacitor C49, the second end of the forty-eighth capacitor C48 is a first differential signal input end of the audio power amplification module 103, and the second end of the forty-ninth capacitor C49 is a second differential signal input end of the audio power amplification module 103;

the first differential signal input end of the audio power amplifier module 103 and the second differential signal input end of the audio power amplifier module 103 are connected with the main control module 101; the differential signal input end of the audio power amplifier module 103 is connected with an audio signal in a differential mode, and high audio information transmission efficiency is achieved between the audio power amplifier module 103 and the main control module 101; the forty-seventh capacitor C47, the forty-eighth capacitor C48, the forty-ninth capacitor C49, the fifth resistor R5 and the sixth resistor R6 together form a low-pass filter, and the high-frequency component in the audio signal can be attenuated by the low-pass filter, so that the integrity of the audio information in the audio signal is maintained, and the audio signal is prevented from having larger noise; in this embodiment, the audio power amplifier module 103 can be driven by an audio signal to realize a better audio playing function, and for example, when the sound of a part of audio components in the audio signal is too loud, the high-frequency input components in the audio signal can be properly attenuated by the low-pass filter, so that the audio signal is soft and comfortable, and the audio power amplifier module 103 has higher audio signal transmission quality and processing efficiency.

The switch control pin SHDN of the audio power amplifier chip U5 and the first end of the seventh resistor R7 are connected with a switch control signal altogether, and the second end of the seventh resistor R7 is grounded to GND; by means of the switch control signal, the audio power amplifier chip U5 is in a working or stopping state, and when the switch control signal is at a high level, the audio power amplifier chip U5 is in a working state; when the switch control signal is at a low level, the audio power amplifier chip U5 is in a stop state, so that the audio power amplifier chip U5 has a flexible control mode, and the audio power amplifier module 103 realizes an audio playing function according to the actual operation requirement of a technician, so that the control response is faster.

The first end of the fifty-first capacitor C50, the first end of the fifty-first capacitor C51 and the first grounding pin of the audio power amplification chip U5 are commonly connected with the ground GND, the second end of the fifty-first capacitor C50, the second end of the fifty-first capacitor C51, the first power pin VDD1 of the audio power amplification chip U5, the second power pin VDD2 of the audio power amplification chip U5 and the first end of the fifty-second capacitor C52 are commonly connected with the charging module 105, and the second end of the fifty-second capacitor C52 and the second grounding pin of the audio power amplification chip U5 are commonly connected with the ground GND; the charging module 105 transmits stable electric energy to the main control module 101, the power pin of the audio power amplification chip U5 can be connected with electric energy and maintain a rated working state, and the electric energy is transmitted to the audio power amplification chip U5 through the charging module 105, so that the audio power amplification chip U5 realizes a charging function, and the physical safety and the application range of the audio power amplification chip U5 are improved.

The fifty-third capacitor C53 is connected between the power supply pin PVDD of the audio power amplifier chip U5 and the ground GND; the audio power amplifier chip U5 can keep the internal power supply stable through the power supply pin PVDD, and the audio power amplifier chip U5 is always in a rated working state, so that the working stability and compatibility of the audio power amplifier module 105 are ensured.

The common mode positive output pin VOP of the audio power amplifier chip U5 is connected with the first end of the eighth resistor R8, the common mode negative output pin VON of the audio power amplifier chip U5 is connected with the first end of the ninth resistor R9, the second end of the eighth resistor R8, the first end of the fifty-fifth capacitor C55, the first end of the fifty-fourth capacitor C54 and the first end of the second TVS diode T2 are connected with the positive input end of the loudspeaker LS, and the second end of the ninth resistor R9, the second end of the fifty-fourth capacitor C54, the first end of the fifty-sixth capacitor C56 and the first end of the third TVS diode T3 are connected with the negative input end of the loudspeaker LS.

The second terminal of the second TVS diode T2 and the second terminal of the third TVS diode T3 are commonly connected to the ground GND.

The second terminal of the fifty-fifth capacitor C55 and the second terminal of the fifty-sixth capacitor C56 are commonly connected to ground GND.

The second TVS diode T2 and the third TVS diode T3 can play a role in stabilizing voltage of the audio signal in the audio power amplifier module 103, so as to prevent spike noise from occurring in the audio signal; the audio power amplifier chip U5 can output the processed audio signals and play the audio signals through the loudspeaker LS so as to meet the hearing requirements of users; and the loudspeaker Ls has the function of amplifying sound, and can emit clearer and complete sound through the audio power amplification module 103, so that better-quality audio information is brought to a user, and the application range of the control circuit 10 is improved.

As an alternative implementation manner, the model number of the audio power amplifier chip U5 is: the AW8733TQR and the audio power amplifier chip U5 have higher communication compatibility, so that the real-time processing function of audio signals is realized; for example, when the differential signal input end of the audio power amplification chip U5 is connected to an audio signal, the audio power amplification chip U5 can suppress the generation of noise, and the charging module 105 provides stable electric energy to the audio power amplification chip U5 to maintain the rated working state of the audio power amplification chip U5; the audio power amplification chip U5 provides an output function with a certain amplitude value for the loudspeaker LS, the audio power amplification chip U5 has a unique sound breaking prevention function, the gain of the power amplifier can be automatically adjusted according to the size of an audio signal, and the loudspeaker LS is in different working states by changing the power of the loudspeaker LS; by changing the level state of the switch control signal, the audio power amplifier chip U5 can be in different working states, and the audio power amplifier module 103 realizes different signal amplification gains for the audio signal; when the level state of the switch control signal shows regular change, the audio power amplifier chip U5 can also realize the effect of circulation control, the audio power amplifier module 103 can output audio information with different volumes according to the hearing requirement of the user, the audio power amplifier module 103 has good operability and stability, the control circuit 10 can realize a higher-quality audio playing function, the functions are complete, and better use experience is brought to the user.

As an alternative implementation manner, fig. 8 shows a schematic circuit structure of the frequency modulation module 104 provided in this embodiment, referring to fig. 8, the frequency modulation module 104 includes: frequency modulation chip U6, fifty-seventh capacitor C57, fifty-eighth capacitor C58, fifty-ninth capacitor C59, sixty-first capacitor C60, sixty-first capacitor C61, third inductance L3, fourth inductance L4, fifth inductance L5, sixth inductance L6, and seventh inductance L7.

The first end of the fifty-seventh capacitor C57 is an analog output end of the frequency modulation module 104, and the second end of the fifty-seventh capacitor C57 is connected with the voice signal output pin RFOUT of the frequency modulation chip U6.

The analog output end of the frequency modulation module 104 is connected with the main control module 101; the analog output end of the frequency modulation module 104 outputs an analog voice signal to the main control module 101, the frequency band of the main control module 101 is adjusted through the analog voice signal, so that the main control module 101 can be suitable for different communication environments and realize a communication control function, the frequency modulation module 104 and the main control module 101 have higher signal compatible transmission performance, the communication state of the main control module 101 can be changed in real time through the analog voice signal, and the control circuit 10 has higher communication quality.

The ground pin of the frequency modulation chip U6 is grounded GND.

The first end of the fifty-eighth capacitor C58 and the first end of the third inductor L3 are commonly connected to the power supply pin VCC of the frequency modulation chip U6, the second end of the fifty-eighth capacitor C58 is grounded to GND, and the second end of the third inductor L2 is connected to a power supply control signal; the internal electric energy running condition of the frequency modulation chip U6 can be changed through the power supply control signal, so that the frequency modulation chip U6 can realize a safe and stable frequency modulation control function, the communication function of the control circuit 10 has higher compatibility, and the control flexibility is higher.

The first end of the fifty-ninth capacitor C59 is connected to the fm signal input pin RFN of the fm chip U6, the second end of the fifty-ninth capacitor C59 is connected to the first end of the fourth inductor L4, the second end of the fourth inductor L4, the first end of the sixty capacitor C60 and the first end of the sixth inductor L6 are connected to the first end of the fifth inductor L5, and the second end of the sixty capacitor C60 and the second end of the sixth inductor L6 are connected to the ground GND.

The second end of the fifth inductor L5, the first end of the sixty-first capacitor C61 and the first end of the seventh inductor L7 are commonly connected to form a fm signal input end of the fm module 104, and the second end of the sixty-first capacitor C61 and the second end of the seventh inductor L7 are commonly connected to the ground GND.

The fm signal input of the fm module 104 is coupled to the antenna 20.

The information interaction between the fm signal input end of the fm module 104 and the antenna 20 can be achieved, so that the fm module 104 is connected to the fm signal, the fm signal contains corresponding fm information, and when the fm module 104 processes the fm signal in real time, the fm chip U6 can maintain the integrity of the fm information, and the main control module 101 has higher stability and flexibility of frequency control, and higher practical value.

As an alternative implementation manner, the model of the frequency modulation chip U6 is AW5007, and the frequency modulation chip U6 can perform filtering processing, amplifying processing, mixing processing and demodulation processing on the frequency modulation signal to obtain an analog signal, so that the better signal processing performance of the frequency modulation module 104 is realized, and the frequency band of the main control module 101 can be adaptively changed; the circuit structure of the frequency modulation module 106 has a relatively high application range, and the control circuit 10 has relatively high signal transmission performance in various frequency environments.

As an alternative implementation manner, fig. 9 shows a schematic circuit structure of the NFC communication module 106 provided in this embodiment, referring to fig. 9, the NFC communication module 106 includes: NFC communication chip U9, sixty-second capacitor C62 and sixty-third capacitor C63;

The first serial communication pin i2c_scl of the NFC communication chip U9 and the first end of the sixty-second capacitor C62 are commonly connected to form a first serial communication end of the NFC communication module 106, the second end of the sixty-second capacitor C62 is grounded GND, the first end of the sixty-third capacitor C63 and the second serial communication pin i2c_sda of the NFC communication chip U9 are commonly connected to form a second serial communication end of the NFC communication module 106, and the second end of the sixty-third capacitor C63 is grounded GND.

The first serial communication end of the NFC communication module 106 and the second serial communication end of the NFC communication module 106 are connected with the main control module 101, so that a signal interaction function can be realized between the NFC communication chip U9 and the main control module 101, and the control circuit 10 has higher signal transmission quality and communication efficiency.

The radio frequency communication pin of the NFC communication chip U9 is connected to the card reader 40, and optionally, the radio frequency communication pin of the NFC communication chip U9 includes: RFI1, RFI2, RFO1 and RFO2; the NFC communication chip U9 may implement a remote signal transmission function with the card reader 40, and ensure signal transmission efficiency and integrity between the card reader 40 and the NFC communication chip U9, where the NFC communication module 106 has a higher signal interaction performance.

As an alternative embodiment, the NFC communication chip U9 is of the type: IC-NFC-ST21NFCD; furthermore, the NFC communication module 106 has a relatively compatible circuit structure, and through the NFC communication chip U9, a high-quality signal interaction function between the card reader 40 and the control circuit 10 can be realized, the control circuit 10 has relatively high NFC communication quality, the diversity and compatibility of communication modes of the control circuit 10 are improved, and through the NFC communication chip U9, a data real-time interaction function can be realized, and the control circuit 10 can maintain a relatively good NFC communication function in each environment.

As an alternative implementation manner, fig. 10 shows a schematic circuit structure of the overvoltage protection module 107 provided in this embodiment, and referring to fig. 10, the overvoltage protection module 107 includes a communication chip U10 and an overvoltage protection chip U11; the signal output pin OUT of the overvoltage protection chip U11 is connected with the charging module 107, so that the overvoltage protection chip U11 can acquire the voltage amplitude of the charging module 107 in real time, and the overvoltage running state of the charging module 107 is monitored in real time; when the overvoltage protection chip U11 monitors that the charging module 107 is in an overvoltage operation state, the overvoltage protection chip U11 takes overvoltage protection measures on the charging module 107, so that the voltage of the charging module 107 returns to a normal state, and charging safety and stability of the charging module 107 are improved.

The communication chip U10 performs wireless communication with external electronic equipment, and the communication chip U10 is connected with the overvoltage protection chip U11, and the overvoltage protection module 107 has higher communication compatibility and control flexibility, so that the overvoltage protection chip U11 receives external operation instructions, and the control circuit 10 has higher power supply security.

As an alternative embodiment, the model of the communication chip U10 is J1704, and the model of the overvoltage protection chip U11 is ET9539L; therefore, the overvoltage protection module 107 has a simplified circuit structure, and the overvoltage protection chip U11 can timely cope with the overvoltage state of the charging module 105, so that the electric energy safety level of the charging module 105 is greatly improved, and the control circuit 10 maintains a stable communication state in various power environments, thereby bringing higher communication use experience to users, and having extremely high practical value.

Fig. 11 shows a schematic structure of the multifunctional machine 110 provided in the present embodiment, referring to fig. 11, the multifunctional machine 110 includes an antenna 20 and the control circuit 10 of the above-described multifunctional machine; referring to the embodiments of fig. 1 to 11, a good communication function can be maintained between the control circuit 10 and the antenna 20, and various communication modes are implemented between the control circuit 10 and external electronic devices, so that the control circuit 10 and the electronic devices perform signal transmission in various communication environments, which has extremely high compatibility and improves the communication quality of the control circuit 10; in this embodiment, when the control circuit 10 is applied to the multifunctional machine 110, the communication function of the multifunctional machine 110 can meet various communication function requirements of technicians, and good use experience is brought to users; therefore, the multifunctional machine 110 can realize the functions of sending and receiving signals in various communication environments, the communication modes have diversity and extremely strong compatibility, and a user can perform the high-quality signal communication function through the multifunctional machine 110, so that the flexibility is high; the multifunctional machine effectively solves the problems that in the prior art, the communication mode of the multifunctional machine is single, the compatibility is low, different communication function requirements of users are difficult to meet, and the use experience of the users is poor.

Fig. 12 shows a schematic structure of the multi-function communication system 120 provided in this embodiment, referring to fig. 12, the multi-function communication system 120 includes: the server 1201, the gateway 1202, the public communication network 1203 and at least one multifunctional machine 110 as above are sequentially connected with the server 1201, the gateway 1202, the public communication network 1203 and the multifunctional machine 110; the multifunctional communication system 120 can realize a higher signal communication function, and has stronger compatibility.

Referring to the embodiment of fig. 11, the multifunctional machine 110 can implement various communication modes, the quality of signal transmission is better, and the multifunctional machine 110 can maintain the integrity and compatibility of signal transmission in various communication environments; in this embodiment, the multiple multifunctional machines 110 are applied to the multifunctional communication system 120, the server 1201 can realize signal transmission and forwarding, the gateway 1202 can realize the 1-protocol interconnection between communication signals, the public communication network 1203 can realize remote sending and receiving of communication signals, each multifunctional machine 110 can be in a stable signal transmission state, and information sharing and remote resource allocation and utilization are realized; the multifunctional machine 110 maintains higher communication quality in different communication environments so as to meet different communication use requirements of users, and brings good use experience to the users; therefore, the multifunctional communication system 120 in this embodiment has strong communication compatibility, can maintain real-time transmission and integrity of communication signals, and the multifunctional communication system 102 performs signal transmission by adopting multiple communication modes, so that the multifunctional communication system 120 has complete functions and wide application range, and can be suitable for various different communication environments, and a user can maintain a good signal transmission state in the multifunctional communication system 120, so that the practical value is extremely high; therefore, the multifunctional communication system 120 is compatible with the characteristics of 2G communication and 4G communication, has excellent signal transmission quality, plays a positive role in promoting the development of communication technology and related applications in the field, and generates important industrial application value; the problems that the communication mode of the communication system in the prior art is single, the compatibility of signal transmission is poor, the communication use requirements of users in different age groups cannot be met, the function is single, and great inconvenience is brought to the use of the users are effectively solved

Various embodiments are described herein for various devices, circuits, apparatuses, systems and/or methods. Numerous specific details are set forth to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and shown in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the specification. It will be appreciated by persons skilled in the art that the embodiments described and illustrated herein are non-limiting examples, and thus it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.

Reference throughout this specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic shown or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without assuming that such combination is not an undue or non-functional limitation. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above …, below …, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the embodiments.

Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Connection references (e.g., attached, coupled, connected, etc.) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, a connective reference does not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be construed broadly and used to provide non-limiting examples of embodiments of the present disclosure, and the present disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from this disclosure.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. A control circuit of a multifunctional machine, comprising:

the audio power amplification module is connected with the main control module and is used for carrying out amplification treatment, anti-sound breaking treatment and filtering treatment on the audio signal, wherein the anti-sound breaking treatment automatically adjusts the power amplification gain of the audio signal according to the power of the audio signal;

The NFC communication module is connected with the main control module and used for conducting NFC communication with the card reader;

the radio frequency communication module comprises: the first radio frequency communication chip, the second radio frequency communication chip, the third radio frequency communication chip, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, the ninth capacitor, the tenth capacitor eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, eighteenth, nineteenth, twentieth, twenty-first, twenty-second, twenty-third, and/or twenty-third capacitors twenty-fourth, twenty-fifth, twenty-sixth, twenty-seventh, twenty-eighth, twenty-ninth, thirty-first, thirty-second, thirty-third, thirty-fourth, thirty-fifth, thirty-sixth, thirty-seventh, thirty-eighth, thirty-ninth, forty-first, forty-second, forty-fourth, first and second inductors;

the grounding pin of the first radio frequency communication chip is grounded.

2. The control circuit of a multifunctional machine according to claim 1, further comprising:

3. The control circuit of a multi-function machine according to claim 1, wherein the charging module includes:

4. A control circuit of a multi-function machine according to claim 3, wherein the charging module further comprises:

5. The control circuit of a multi-function machine according to claim 1, wherein the charging module includes: the charge detection chip, the first resistor, the second resistor, the third resistor, the fourth resistor, the forty-five capacitor and the forty-six capacitor;

6. The control circuit of a multifunctional machine according to claim 1, wherein the audio power amplifier module comprises: an audio power amplifier chip, a forty-seventh capacitor, a forty-eighth capacitor, a forty-ninth capacitor, a fifty-eighth capacitor, a fifty-first capacitor, a fifty-second capacitor, a fifty-third capacitor, a fifty-fourth capacitor, a fifty-fifth capacitor, a fifty-sixth capacitor, a second TVS diode, a third TVS diode, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a loudspeaker;

7. The control circuit of a multi-function machine according to claim 1, wherein the frequency modulation module comprises: a frequency modulation chip, a fifty-seventh capacitor, a fifty-eighth capacitor, a fifty-ninth capacitor, a sixty-first capacitor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor and a seventh inductor;

the grounding pin of the frequency modulation chip is grounded;

8. A multifunctional machine comprising an antenna and further comprising a control circuit of the multifunctional machine as claimed in any one of claims 1-7.

9. A multi-function communication system, comprising: the server, the gateway, the public communication network and at least one multifunctional machine according to claim 8 are sequentially connected.