A communication circuit, method and device

Abstract

The present application relates to the field of communication technology, and discloses a communication circuit, method and device. Among them, the communication circuit includes: a human body communication chip, a power boosting module, a power reduction module, a switch module and a signal electrode. Among them, the switch module is connected to the signal electrode, the power boosting module is respectively connected to the TX end of the human body communication chip and the switch module, and the power reduction module is respectively connected to the TX end of the human body communication chip and the switch module; when the switch module is switched to the power boosting module closed, the TX end of the human body communication chip, the power boosting module and the signal electrode can be turned on to increase the transmission power of the electronic device; when the switch module is switched to the power reduction module closed, the TX end of the human body communication chip, the power reduction module and the signal electrode can be turned on to reduce the transmission power of the electronic device. Based on the above communication circuit, different circuit modules can be turned on in different scenarios to meet the power requirements of different scenarios.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication circuit, method and device. Background Art

[0002] Currently, electronic devices can exchange information through human body communication technology. Human body communication technology is a short-range communication method that uses the human body as a signal transmission medium. Figure 1 As shown, when user A holds mobile phone 10 and mobile phone 20, the conductive function of the human body can be used to transmit signals using user A as an information channel to achieve data transmission between mobile phone 10 and mobile phone 20.

[0003] At present, when electronic devices use human body communication technology, there are usually touch detection requirements and data transmission requirements. The touch detection requirement refers to the electronic device sensing the contact between the user, transmitting the detection signal through the human body, and detecting the counterpart electronic device that needs to establish human body communication; the data transmission requirement refers to sending data to other electronic devices or receiving data sent by other electronic devices after establishing a human body communication connection with other electronic devices.

[0004] Among them, during the touch detection process, the electronic device needs to have high sensitivity and accuracy to sense contact with the user or detect other electronic devices that lightly touch the user. It can be understood that the greater the signal transmission power, the greater the signal propagation distance and intensity. Therefore, in the touch detection scenario, the electronic device needs a larger signal transmission power to achieve accurate and fast touch detection; and in the data transmission process, because the two-end electronic devices have established a connection, it has been determined that short-range communication can be used for data transmission, so only a smaller signal transmission power is required to achieve data transmission.

[0005] At present, some technologies usually adopt the method of adding a direct current to direct current (DCDC) module to adjust the transmission power by changing the voltage, but this method is prone to electromagnetic compatibility (EMC) risks. For example, the current generated by the DCDC module during operation may cause electromagnetic interference problems, disrupt the normal operation of other circuit components, and affect the communication between electronic devices. Summary of the invention

[0006] To solve the above problems, the embodiments of the present application provide a communication circuit, method and device.

[0007] In a first aspect, the present application provides a communication circuit, comprising: a communication chip, a power boosting module, a power reduction module, a first switch module and a first electrode; wherein the first switch module is connected to the first electrode; the power boosting module is respectively connected to the transmitting end of the communication chip and the first switch module, and is used to increase the transmitting power of the communication circuit when the first switch module turns on the transmitting end of the communication chip, the power boosting module and the first electrode; the power reduction module is respectively connected to the transmitting end of the communication chip and the first switch module, and is used to reduce the transmitting power of the communication circuit when the first switch module turns on the transmitting end of the communication chip, the power reduction module and the first electrode.

[0008] In the present application, the communication chip may be the human body communication chip mentioned in the present application; the first electrode may be the signal electrode in contact with the human body mentioned in the present application; the transmitting end of the communication chip may be the transmitting (transmit, TX) end of the human body communication chip mentioned in the present application; the first switch module may be the switch module connected to the signal electrode mentioned in the present application, for example, the switch module may be the switch module described later. Figure 3A The switch 301 mentioned in .

[0009] It can be understood that in this application, a power boost module and a power reduction module are added between the human body communication chip and the signal electrode of the electronic device. One end of the first switch module is connected to the signal electrode, and the other end can be switched to the power boost module or the power reduction module.

[0010] In some embodiments, when the first switch module is switched to the power boost module and closed, the TX end of the human body communication chip, the power boost module, the first switch module and the signal electrode are connected in sequence, which can increase the transmission power of the electronic device.

[0011] In some embodiments, when the first switch module is switched to the power reduction module closed, the TX end of the human body communication chip, the power reduction module, the first switch module and the signal electrode are connected in sequence, which can reduce the transmission power of the electronic device.

[0012] In some embodiments, the circuit elements of the power boost module and the power down module may be inductive elements.

[0013] Based on the above communication circuit, different circuit modules can be turned on in different scenarios to meet the power requirements of different scenarios, and the electromagnetic interference problem existing in adding a DCDC module in some embodiments can be effectively avoided.

[0014] In a possible implementation, the above circuit also includes: a signal receiving module; wherein the signal receiving module is respectively connected to the receiving end of the communication chip and the first switch module, and is used to receive the signal when the first switch module turns on the receiving end of the communication chip, the signal receiving module and the first electrode.

[0015] In the present application, the receiving end of the communication chip may be the receiving (receive, RX) end of the human body communication chip mentioned in the present application.

[0016] It can be understood that in this application, a signal receiving module can be added between the human body communication chip and the signal electrode of the electronic device. One end of the first switch module is connected to the signal electrode, and the other end can be switched to the conductive signal receiving module.

[0017] In some embodiments, when the first switch module is switched to close the signal receiving module, the RX end of the human body communication chip, the signal receiving module, the first switch module and the signal electrode are connected in sequence, so that signals sent by other electronic devices can be received, and the impact of changes in loop capacitance on the circuit can be minimized.

[0018] In a possible implementation, the power boost module includes a first inductor, wherein a first end of the first inductor is connected to a transmitting end of the communication chip, and a second end of the first inductor is connected to the first switch module.

[0019] In the present application, the first inductor may be the inductor for series resonant matching at the TX end of the human body communication chip mentioned in the present application. For example, the first inductor may be Figure 5B The inductor L1 in channel one mentioned in .

[0020] It can be understood that in the present application, the circuit element in the power boost module can be a first inductor element, and the first inductor is respectively connected to the TX end of the human body communication chip and the first switch module.

[0021] In some embodiments, after the first switch module is switched to close the first inductor, the TX end of the human body communication chip, the first inductor, the first switch module and the signal electrode are sequentially connected in series, so as to increase the transmission power of the electronic device.

[0022] In a possible implementation, the power reduction module includes a first circuit path and a second circuit path; wherein the first circuit path is respectively connected to the transmitting end of the communication chip and the first switch module; and the second circuit path is respectively connected to the transmitting end of the communication chip and the ground.

[0023] It can be understood that in the present application, the power reduction module can be a parallel branch circuit module. Among them, when the first switch module is switched to the power reduction module closed, the first circuit path in the power reduction module is used to conduct the TX end and the first electrode of the human body communication chip, transmit the signal from the TX end of the human body communication chip to the first electron in contact with the human body, and then send it to other electronic devices through the human body; the second circuit path connects the TX end of the human body communication chip and the ground respectively.

[0024] In a possible implementation, the second circuit path includes a second inductor and a second electrode; wherein the second electrode is a ground electrode for connecting to the ground; a first end of the second inductor is connected to a transmitting end of the communication chip, and a second end of the second inductor is connected to the second electrode.

[0025] In the present application, the second inductor may be the inductor for parallel resonant matching at the TX end of the human body communication chip mentioned in the present application, and the second electrode may be the electrode for parallel resonant matching at the TX end of the human body communication chip; for example, the second inductor may be the inductor for parallel resonant matching at the TX end of the human body communication chip mentioned in the present application; Figure 5B The inductor L2 in the second channel mentioned in the above text; the second electrode can be Figure 5B The GND electrode 103 in the channel two mentioned in .

[0026] It can be understood that in the present application, the circuit elements in the second circuit path in the power reduction module may include a second inductor and a second electrode, wherein the second inductor is respectively connected to the TX terminal of the human body communication chip and the second electrode, and the second electrode is grounded.

[0027] In some embodiments, after the first switch module is switched to the power reduction module and closed, a parallel resonant match can be formed with the transmitting end circuit of the electronic device through the second inductor to increase the overall impedance of the transmitting end, thereby reducing the transmission power of the electronic device.

[0028] In a possible implementation, the signal receiving module includes a third circuit path and a fourth circuit path; wherein the third circuit path is respectively connected to the receiving end of the communication chip and the first switch module; and the fourth circuit path is respectively connected to the first switch module and the ground.

[0029] It can be understood that in the present application, the signal receiving module can be a parallel branch circuit module. Among them, when the first switch module is switched to the signal receiving module closed, the third circuit path in the signal receiving module is used to conduct the RX end and the first electrode of the human body communication chip, and transmit the signal sent by other electronic devices from the first electrode in contact with the human body to the RX end of the human body communication chip; the fourth circuit path is respectively connected to the first switch module and the ground.

[0030] In a possible implementation, the fourth circuit path includes a third inductor and a third electrode; wherein the third electrode is a grounding electrode for connecting to the ground; a first end of the third inductor is connected to the first switch module, and a second end of the third inductor is connected to the third electrode.

[0031] In the present application, the third inductor may be the inductor for parallel resonance matching at the RX end of the human body communication chip mentioned in the present application, and the third electrode may be the electrode for parallel resonance matching at the RX end of the human body communication chip; for example, the third inductor may be the inductor for parallel resonance matching at the RX end of the human body communication chip mentioned in the present application; Figure 5B The inductor L3 in channel 3 mentioned in the above text; the third electrode can be Figure 5B The GND electrode 104 in the channel three mentioned in .

[0032] It can be understood that in the present application, the circuit elements in the fourth circuit path in the signal receiving module may include a third inductor and a third electrode, wherein the third inductor is connected to the first switch module and the third electrode respectively, and the third electrode is grounded.

[0033] In one possible implementation, the above-mentioned circuit also includes a second switch module; wherein the first end of the second switch module is connected to the power reduction module; the second end of the second switch module is used to connect to the transmitting end of the communication chip to increase the transmitting power of the communication circuit, or to connect to the receiving end of the communication chip to receive signals.

[0034] In the present application, the second switch module may be a switch module for switching between the TX terminal and the RX terminal of the human body communication chip mentioned in the present application, for example, it may be Fig. 6A The switch 602 mentioned in .

[0035] It can be understood that in the present application, since the power reduction module and the signal receiving module are both parallel branch circuits with two circuit paths, the same parallel branch circuit module can be used to implement the functions of the power reduction module and the signal receiving module.

[0036] In some embodiments, when the second switch module is switched to the TX end of the human body communication chip and closed, the power reduction module function is realized; when the second switch module is switched to the RX end of the human body communication chip and closed, the receiving module function is realized. In this way, the number of circuit components used can be reduced.

[0037] In one possible implementation, the power reduction module includes a fifth circuit path and a sixth circuit path; wherein the fifth circuit path is used to conduct the transmitting end and the first electrode of the communication chip, or to conduct the receiving end and the first electrode of the communication chip; the sixth circuit path includes a fourth inductor and a fourth electrode, wherein the fourth inductor is connected to the fourth electrode, and the fourth electrode is grounded.

[0038] In the present application, the fourth inductor may be an inductor commonly used in the parallel resonant matching at the TX end of the human body communication chip and the parallel resonant matching at the RX end mentioned in the present application, and the fourth electrode may be an electrode commonly used in the parallel resonant matching at the TX end of the human body communication chip and the parallel resonant matching at the RX end mentioned in the present application; for example, the fourth inductor may be Figure 6B The inductor L5 mentioned in the above description; the fourth electrode may be Figure 6B The GND electrode 105 mentioned in FIG.

[0039] It can be understood that in the present application, the power reduction module can be a parallel branch circuit module. Among them, when the first switch module is switched to the power reduction module to close, and the second switch module is switched to the TX end of the human body communication chip to close, the fifth circuit path in the power reduction module is used to conduct the TX end and the first electrode of the human body communication chip, and transmit the signal from the TX end of the human body communication chip to the first electron in contact with the human body, and then send it to other electronic devices through the human body; the fifth inductor in the sixth circuit path is respectively connected to the TX end and the fifth electrode of the human body communication chip, and the fifth electrode is grounded.

[0040] In some embodiments, when the first switch module is switched to the power reduction module and closed, and the second switch module is switched to the RX end of the human body communication chip and closed, the fifth circuit path in the power reduction module is used to connect the RX end of the human body communication chip and the first electrode, and transmit the signal sent by other electronic devices from the first electrode in contact with the human body to the RX end of the human body communication chip; the fifth inductor in the sixth circuit path is grounded by connecting the fifth electrode.

[0041] In a possible implementation, the above-mentioned first switch module is used to turn on the transmitting end, power boosting module and first electrode of the communication chip when a touch detection instruction is detected; the first switch module is used to turn on the transmitting end, power reduction module and first electrode of the communication chip when a data transmission instruction is detected; the first switch module is used to turn on the receiving end, signal receiving module and first electrode of the communication chip when a signal receiving instruction is detected.

[0042] It can be understood that in the present application, when a touch detection instruction is detected, the first switch module can switch to close the power boost module, turn on the TX end of the human body communication chip, the power boost module and the first electrode, and increase the transmission power.

[0043] In some embodiments, when a data transmission instruction is detected, the first switch module can switch to close the power reduction module, turn on the TX end of the human body communication chip, the power reduction module and the first electrode, and reduce the transmission power.

[0044] In some embodiments, when a signal receiving instruction is detected, the first switch module can switch to close the signal receiving module, connect the RX end of the human body communication chip, the signal receiving module and the first electrode, and receive signals sent by other electronic devices.

[0045] In a possible implementation, the first electrode is used to transmit a signal when in contact with a human body.

[0046] It is understood that in some embodiments, there are two electrode sheets in the electronic device, and the electrode sheet touched by the user will serve as a signal electrode. When performing human body communication, the signal electrodes of the two electronic devices need to be in contact with the user to form a link, and the electrical signal is transmitted using the conductivity of the human body, thereby realizing data transmission through the human body as a channel.

[0047] In a possible implementation, the first inductor is an adjustable inductor.

[0048] It can be understood that in the present application, the first inductor is an adjustable inductor, and the other inductors mentioned in the embodiments of the present application (for example, the second inductor, the third inductor, etc.) can all be adjustable inductors, wherein the inductance value range can be 1nH-1mH, and the present application does not limit this.

[0049] In the second aspect, the present application provides a communication method for the communication circuit mentioned in the present application, and the method includes: when a touch detection instruction is detected, controlling the first switch module to turn on the transmitting end, the power boosting module and the first electrode of the communication chip to increase the transmission power of the communication circuit; when a data transmission instruction is detected, controlling the first switch module to turn on the transmitting end, the power reduction module and the first electrode of the communication chip to reduce the transmission power of the communication circuit.

[0050] In the present application, the communication chip may be the human body communication chip mentioned in the present application; the first electrode may be the signal electrode in contact with the human body mentioned in the present application; and the transmitting end of the communication chip may be the TX end of the human body communication chip mentioned in the present application.

[0051] It can be understood that in the present application, when a touch detection instruction is detected, the first switch module can switch to close the power boost module, turn on the TX end of the human body communication chip, the power boost module and the first electrode, and increase the transmission power.

[0052] In some embodiments, when a data transmission instruction is detected, the first switch module can switch to close the power reduction module, turn on the TX end of the human body communication chip, the power reduction module and the first electrode, and reduce the transmission power.

[0053] In some embodiments, the switching of the switch may be performed by an operating system or a processor in the electronic device.

[0054] In a possible implementation, the method further includes: when a signal receiving instruction is detected, controlling the first switch module to conduct the receiving end of the communication chip, the signal receiving module and the first electrode to receive the signal.

[0055] In the present application, the receiving end of the communication chip may be the RX end of the human body communication chip mentioned in the present application.

[0056] It can be understood that in the present application, when a signal receiving instruction is detected, the first switch module can switch to close the signal receiving module, connect the RX end of the human body communication chip, the signal receiving module and the first electrode, and realize the reception of signals sent by other electronic devices.

[0057] In a third aspect, the present application provides an electronic device, wherein the electronic device includes the communication circuit mentioned in the present application.

[0058] In a fourth aspect, the present application provides an electronic device, comprising: a memory and a processor, wherein the memory is used to store instructions executed by one or more processors of the electronic device, and the processor is one of the one or more processors of the electronic device, and is used to execute the communication method mentioned in the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 According to some embodiments of the present application, a schematic diagram of a human body communication scenario is shown;

[0060] Figure 2A According to some embodiments of the present application, a schematic diagram of an equivalent model of human body communication is shown;

[0061] Figure 2B According to some embodiments of the present application, a schematic diagram of an equivalent circuit of human body communication is shown;

[0062] Figure 3A According to some embodiments of the present application, a first schematic diagram of a human body communication circuit is shown;

[0063] Figure 3B According to some embodiments of the present application, a partial structural schematic diagram of a first human body communication circuit is shown;

[0064] Figure 4A According to some embodiments of the present application, a second schematic diagram of a human body communication circuit is shown;

[0065] Figure 4B According to some embodiments of the present application, a partial structural schematic diagram of a second human body communication circuit is shown;

[0066] Figure 5A According to some embodiments of the present application, a schematic diagram of an internal circuit of a first electronic device is shown;

[0067] Figure 5B According to some embodiments of the present application, an equivalent circuit schematic diagram corresponding to an internal circuit of a first electronic device is shown;

[0068] Fig. 6A According to some embodiments of the present application, a schematic diagram of an internal circuit of a second electronic device is shown;

[0069] Figure 6B According to some embodiments of the present application, an equivalent circuit schematic diagram corresponding to an internal circuit of a second electronic device is shown;

[0070] Figure 7 According to some embodiments of the present application, a schematic diagram of an equivalent circuit for performing series resonance matching at a signal transmitting end during human body communication is shown;

[0071] Figure 8 According to some embodiments of the present application, a schematic diagram of an equivalent circuit diagram for parallel resonance matching at a signal transmitting end during human body communication is shown;

[0072] Fig. 9 According to some embodiments of the present application, a schematic diagram of the proportion of time that an electronic device acts as a signal sending end and a receiving end during human body communication is shown;

[0073] Fig.10 According to some embodiments of the present application, a schematic diagram of a human body communication process is shown;

[0074] Fig.11 According to some embodiments of the present application, a schematic diagram of the hardware structure of an electronic device is shown. DETAILED DESCRIPTION

[0075] The illustrative embodiments of the present application include, but are not limited to, a communication circuit, method, and device.

[0076] The following first briefly describes the background of the method provided in the embodiments of the present application.

[0077] First combine Figure 2A ,The equivalent model when two electronic devices communicate through the user’s body is briefly introduced.

[0078] It is understood that in some embodiments, there are two electrode sheets in the electronic device, the electrode sheet touched by the user will be used as the signal electrode, and the electrode sheet not touched by the user will be used as a suspended ground electrode (i.e., an electrode not connected to the ground through a physical wire). It is understood that the signal electrode and the suspended ground electrode can be determined according to the user's touch.

[0079] When human-body communication is performed, the signal electrodes of two electronic devices need to be in contact with the user to form a link, and the electrical signal is transmitted using the conductivity of the human body, so that data can be transmitted through the human body as a channel. In addition, the electronic device also has a suspended ground electrode to ensure human safety during human-body communication.

[0080] In some embodiments, the electronic device has a human body communication chip capable of performing human body communication functions. When performing human body communication, the signal can be transmitted from the human body communication chip of the electronic device to the signal electrode in contact with the human body, transmitted through the human body to the signal electrode of the opposite electronic device, and finally transmitted to the human body communication chip of the opposite electronic device to receive the signal. The human body communication chip includes a transmitting (transmit, TX) end and a receiving (receive, RX) end, the TX end is used to send signals, and the RX end is used to receive signals.

[0081] In some embodiments, for example, Figure 2A As shown, the user wears smart bracelet A and smart bracelet B, and uses smart bracelet A and smart bracelet B for human body communication, wherein smart bracelet A uses the TX end of the human body communication chip for communication, and smart bracelet B uses the RX end of the human body communication chip for communication, i.e., smart bracelet A is used as the signal transmitting end (i.e., TX end), and smart bracelet B is used as the signal receiving end (i.e., RX end). When performing human body communication, a signal transmission path is formed between the signal electrode 202 at the TX end and the signal electrode 203 at the RX end through the user's body, wherein a certain resistance (i.e., R201) exists in the human body, and the human body is equivalent to a capacitor (i.e., C3) during human body communication. In addition, a capacitor (i.e., C1) can be formed between the suspended ground electrode 201 at the TX end and the earth, and a circuit path is formed between the suspended ground electrode 201 at the TX end and the earth through the capacitor C1; a capacitor (i.e., C2) can be formed between the suspended ground electrode 204 at the RX end and the earth, and a circuit path is formed between the suspended ground electrode 204 at the RX end and the earth through the capacitor C2. In this way, a complete signal loop can be formed between the TX end, the RX end, the human body and the earth, and data can be transmitted through this signal loop as an information channel.

[0082] Based on the equivalent model of human body communication mentioned above, combined with Figure 2B A brief introduction to the equivalent circuit diagram of human body communication is given.

[0083] like Figure 2B As shown, during human body communication, the human body is equivalent to a capacitor (i.e., C3) connected to the ground; there is a capacitor C4 between the signal electrode at the TX end and the suspended ground electrode (i.e., the ground (Ground, GND) electrode), and the GND electrode is connected to the ground through the capacitor C1. In addition, when the electronic device is used as the TX end, it will also provide a power supply voltage V1 and generate a certain resistance (i.e., R1) during communication; at the RX end of human body communication, there is a capacitor C5 between the signal electrode at the RX end and the suspended ground electrode (i.e., the ground (Ground, GND) electrode), and the GND electrode is connected to the ground through the capacitor C2. In addition, when the electronic device is used as the RX end, it can be approximated to an equivalent resistor (i.e., R2).

[0084] Based on the above equivalent circuit diagram and various circuit components, formula (1) shows the transmission power P during human body communication. TX Calculation method:

[0085]

[0086] Among them, P TX is the output power of the TX end, that is, the transmission power of human body communication; V TX is the output voltage of the TX terminal, that is, the voltage value of the power supply voltage V1; W is the angular frequency of human body communication; C TX is the capacitance value of capacitor C4.

[0087] Based on the above equivalent circuit diagram and various circuit components, formula (II) and formula (III) show the received power P during human body communication: RX Calculation method:

[0088]

[0089]

[0090] Among them, V RX is the voltage across resistor R2, i.e., the RX receiving end voltage; P RX is the received power at the RX end, that is, the received power during human body communication; C ret(RX) is the capacitance value of capacitor C2; C ret(TX) is the capacitance value of capacitor C1; C RX is the capacitance value of capacitor C5; C body is the capacitance value of capacitor C3; V TX is the output voltage of the TX terminal, that is, the voltage value of the power supply voltage V1; R RX is the impedance of resistor R2.

[0091] It can be understood that when the voltage at the signal transmitting end is fixed, the transmission power P obtained based on the above equivalent circuit is TX It will not change and cannot meet the different power requirements of touch detection and data transmission during human body communication.

[0092] As mentioned above, when dealing with different needs of human body communication, current electronic devices usually use direct current to direct current (DCDC) technology to change the voltage to adjust the transmission power. Among them, DCDC technology is a power conversion technology that can convert the voltage of a DC power supply into another DC voltage. For example, in a touch detection scenario, the power supply voltage of an electronic device is converted to a high voltage, so that the electronic device has a higher transmission power; during data transmission, the power supply voltage is converted to a low voltage, so that the electronic device has a smaller transmission power, so that different power requirements can be met.

[0093] However, the implementation of DCDC technology in electronic devices usually requires an additional embedded DCDC module (for example, a circuit board or chip that implements the DCDC function). In addition, the DCDC module may also generate electromagnetic compatibility (EMC) risks during operation. For example, the current generated by the DCDC module during operation may cause electromagnetic interference problems, disrupt the normal operation of other circuit components, and affect the communication between electronic devices.

[0094] In order to solve the above problems, an embodiment of the present application provides a communication circuit. A power boost module and a power reduction module are added between the human body communication chip and the signal electrode of the electronic device, wherein the power boost module is used to increase the transmission power of the electronic device, and the power reduction module is used to reduce the transmission power of the electronic device. Specifically, the power boost module can increase the transmission power of the electronic device by reducing the overall impedance of the signal transmitting end, thereby meeting the high transmission power requirements of touch detection in human body communication. The power reduction module can reduce the transmission power of the electronic device by increasing the overall impedance of the signal transmitting end, thereby meeting the low power requirements of data transmission in human body communication.

[0095] Understandably, in general, Figure 2B In the human body communication equivalent circuit shown, the capacitive reactance of capacitor C4 is smaller than that of capacitor C1, and the overall impedance of the transmitting end of the electronic device is determined by the capacitive reactance of capacitor C4. A power boosting module is added between the human body communication chip and the signal electrode. For example, the newly added power boosting module is an inductor, which can couple with the capacitor to form a resonant loop to offset the capacitive reactance of the capacitor, thereby reducing the overall impedance of the transmitting end and increasing the power of the transmitting end. The capacitive reactance is the resistance strength of the capacitor to the current.

[0096] In addition, the circuit element in the newly added power reduction module is an inductor, which forms a parallel resonant match with the capacitor C4, which can increase the overall impedance of the transmitter, thereby reducing the power of the transmitter and meeting the low-power requirements of data transmission in human body communication.

[0097] Specifically, Figure 3A As shown, a power boost module 302 and a power reduction module 303 are newly added between the TX terminal 1001 of the human body communication chip 100 and the signal electrode 101. Wherein, when a larger transmission power is required, the processor of the electronic device can control the switch 301 to switch on the power boost module 302, so that the signal is transmitted from the TX terminal 1001 of the human body communication chip 100 through the power boost module 302 to the signal electrode 101. For example, the power boost module 302 can be an inductor or other element. In addition, when a smaller transmission power is required, the processor of the electronic device can control the switch 301 to switch on the power reduction module 303, so that the signal is transmitted from the TX terminal 1001 of the human body communication chip 100 through the power reduction module 303 to the signal electrode 101; wherein the power reduction module 303 can be a parallel branch circuit module, for example, Figure 3B As shown, the first path in the power reduction module 303 can be that the TX end 1001 of the human body communication chip 100 is directly connected to the signal electrode 101, and the second path can be formed by connecting the parallel inductor L1 and then grounding; it can be understood that when the switch 301 is switched to the power reduction module 303 and closed, the overall impedance of the transmitting end can be increased, so that the transmission power of the electronic device can be reduced. Based on the above communication circuit, different circuit modules can be turned on in different scenarios to meet the power requirements of different scenarios, and the electromagnetic interference problem existing in the above DCDC module will not occur.

[0098] In some embodiments, based on Figure 3A The communication circuit shown can also be Figure 4A As shown, a signal receiving module 404 is added between the RX terminal 1002 of the human body communication chip 100 and the signal electrode 101. The signal receiving module 404 can be a parallel branch circuit module, for example, Figure 4B As shown, the first path in the signal receiving module 404 can be that the RX end 1002 is directly connected to the signal electrode 101, and the second path can be formed by connecting the parallel inductor L2 and then grounding; it can be understood that by adding the signal receiving module 404, when the switch 301 is switched to connect the signal receiving module 404, the overall impedance of the receiving end will increase, reducing the impact of the change in loop capacitance on the circuit.

[0099] In addition, since the above-mentioned power reduction module and signal receiving module are both parallel branch circuits with two circuit paths, in some embodiments of the present application, the power reduction module and the signal receiving module can use the same parallel branch circuit module. For example, when the switch is switched to the TX end of the human body communication chip and is closed, the power reduction module function is realized; when the switch is switched to the RX end of the human body communication chip and is closed, the signal receiving module function is realized. In this way, the power reduction module and the signal receiving module can realize each function using only one parallel branch circuit module, wherein the circuit element in the parallel branch circuit module can be an inductor element or an inductor connected in series with other circuit elements.

[0100] The following takes the circuit elements in each module as an example, based on Figure 5A and 5B The first communication circuit of the electronic device mentioned in the embodiment of the present application is briefly introduced.

[0101] It is understood that in some embodiments, there are two electrode sheets in the electronic device, the electrode sheet touched by the user will be used as the signal electrode, and the electrode sheet not touched by the user will be used as a suspended ground electrode (i.e., an electrode not connected to the ground through a physical wire). It is understood that the signal electrode and the suspended ground electrode can be determined according to the user's touch.

[0102] Specifically, the circuit scheme is as follows Figure 5A As shown, in the electronic device, there is a human body communication chip 100, a signal electrode 101, and a suspended ground electrode (i.e., a ground (GND) electrode) 102, wherein the human body communication chip 100 includes a TX 1001 as a signal transmitter and an RX 1002 as a signal receiver. In the circuit of the embodiment of the present application, three circuit channels are formed between the human body communication chip 100 and the signal electrode 101 by adding three inductors, namely, an inductor L1, an inductor L2, and an inductor L3, and a three-way switch 501, wherein one end of the three-way switch 501 is used to connect the signal electrode 101, and the other end can be switched to different channels.

[0103] exist Figure 5A In the embodiment, the inductor L1 can be a circuit element in the power boost module mentioned above, the inductor L2 can be a circuit element in the power reduction module mentioned above, and the inductor L3 can be a circuit element in the signal receiving module mentioned above. The power boost module can form channel one, the power reduction module can form channel two, and the signal receiving module can form channel three.

[0104] For example, in Figure 5AIn the embodiment, channel one is a circuit path of a series inductor L1, one end of which is connected to the TX 1001 of the human body communication chip 100, and the other end can be connected to the three-way switch 501. Channel two is connected to the TX 1001 of the human body communication chip 100 at one end, and the other end can be connected to the three-way switch 501, wherein channel two includes a branch circuit formed by two circuit paths, one circuit path is a direct connection between the TX 1001 of the human body communication chip 100 and the signal electrode 101, and the other circuit path is a connection between the inductor L2 and the ground. Channel three is connected to the RX 1002 of the human body communication chip 100 at one end, and the other end can be connected to the three-way switch 501, wherein channel three includes a branch circuit formed by two circuit paths, one circuit path is a direct connection between the RX 1002 of the human body communication chip 100 and the signal electrode 101, and the other circuit path is a connection between the inductor L3 and the ground.

[0105] In some embodiments, some additional circuit components, such as resistors, switches, etc., may be added to each circuit path in channel one, channel two, and channel three, respectively, but this embodiment of the present application does not limit this.

[0106] based on Figure 5A The circuit shown, Figure 5B The corresponding equivalent circuit diagram is shown. Figure 5B As shown, when channel one is connected to switch 501, the electronic device acts as the TX end of human body communication and adopts series resonance matching. The signal is transmitted from the TX end 1001 of the human body communication chip 100 through the inductor L1 and the switch 501 to the signal electrode 101. The signal electrode 101 is in contact with the human body to transmit the signal through the human body to the electronic device at the opposite end. In addition, when channel one is connected to switch 501, the electronic device will have a larger transmission power and can be used in the touch detection scenario during human body communication.

[0107] For example, Figure 5B As shown, when channel two is connected to switch 501, it indicates that the electronic device serves as the TX end of human body communication and adopts parallel resonant matching inductor L2, and inductor L2 is connected to GND electrode 103. The signal is transmitted directly from TX1001 of human body communication chip 100 to signal electrode 101 through switch 501, and the signal is transmitted to the opposite electronic device through the human body by contacting the signal electrode 101 with the human body. In addition, when channel two is closed, the overall impedance of the electronic device's transmitting end can be increased by the parallel inductor L2, so that the electronic device has a smaller transmission power and can be used in data transmission scenarios during human body communication.

[0108] For example, Figure 5BAs shown, when channel three is connected to switch 501, it means that the electronic device as the RX end of human body communication is simultaneously connected to parallel resonant matching inductor L3, and inductor L3 is connected to GND electrode 104. After the signal electrode 101 receives the signal sent by the opposite electronic device transmitted through the human body, it is directly transmitted to RX 1002 of the human body communication chip 100 through switch 501. In addition, when channel three is closed, the electronic device can have a larger receiving power by connecting inductor L3 in parallel, thereby enhancing the signal receiving effect of human body communication.

[0109] In this way, the electronic device can be switched to different working states by switching the switch to meet the communication needs of the human body.

[0110] The following takes the circuit elements in each module as an example, based on Fig. 6A and Figure 6B The second communication circuit of the electronic device mentioned in the embodiment of the present application is briefly introduced. Compared with the first circuit, the second circuit uses three inductors and one multi-way switch, while the second circuit uses two inductors and two multi-way switches.

[0111] Specifically, the circuit scheme is as follows Fig. 6A As shown, there are a human body communication chip 100, a signal electrode 101 and a suspended GND electrode 102 in the electronic device, wherein the human body communication chip 100 includes a TX 1001 as a signal transmitter and an RX 1002 as a signal receiver.

[0112] As shown in Figure 6A, in the circuit of the embodiment of the present application, three circuit channels are formed between the human body communication chip 100 and the signal electrode 101 by adding two inductors, inductor L4 and inductor L5, and two dual-way switches, switch 601 and switch 602, wherein one end of switch 601 is used to connect the signal electrode 101, and the other end can be switched to different channels; one end of switch 602 can be connected to switch 601 to close channel two or channel three, and the other end can be switched between TX 1001 and RX 1002 of the human body communication chip 100.

[0113] exist Fig. 6A In the embodiment, the inductor L4 can be a circuit element in the power boost module mentioned above, and the inductor L5 can be a circuit element commonly used in the power reduction module and the signal receiving module mentioned above. The power boost module can form channel one, and the power reduction module can form channel two and channel three.

[0114] For example, Fig. 6AAs shown, channel one is a circuit path of a series inductor L4, one end of which is connected to the TX 1001 of the human body communication chip 100, and the other end can be connected to the dual-way switch 601. When the switch 601 is connected to the node 1 and the switch 602 is connected to the node 2, it means that channel two is closed and one end is connected to the TX 1001 of the human body communication chip 100, wherein channel two includes a branch circuit formed by two circuit paths, one circuit path is a direct connection between the TX 1001 of the human body communication chip 100 and the signal electrode 101, and the other circuit path is a connection between the inductor L5 and the ground. When the switch 601 is connected to the node 1 and the switch 602 is connected to the node 3, it means that channel three is closed and one end is connected to the RX 1002 of the human body communication chip 100, wherein channel three includes a branch circuit formed by two circuit paths, one circuit path is a direct connection between the RX 1002 of the human body communication chip 100 and the signal electrode 101, and the other circuit path is a connection between the inductor L5 and the ground. It can be understood that in this circuit scheme, both channel 2 and channel 3 use inductor L5 for parallel resonant matching.

[0115] In some embodiments, some additional circuit components, such as resistors, switches, etc., may be added to each circuit path in channel one, channel two, and channel three, respectively, but this embodiment of the present application does not limit this.

[0116] based on Fig. 6A The circuit shown, Figure 6B The corresponding equivalent circuit diagram is shown. Figure 6B As shown, when channel one is connected to switch 601, the electronic device acts as the TX end of human body communication and adopts series resonance matching. The signal is transmitted from the TX end 1001 of the human body communication chip 100 through the inductor L4 and the switch 601 to the signal electrode 101. The signal electrode 101 is in contact with the human body to transmit the signal through the human body to the electronic device at the opposite end. In addition, when channel one is connected to switch 601, the electronic device will have a larger transmission power and can be used in the touch detection scenario during human body communication.

[0117] For example, Figure 6B As shown, when switch 601 and switch 602 are cut to channel 2 to close channel 2, it means that the electronic device serves as the TX end of human body communication and adopts parallel resonance matching. The signal is directly transmitted from TX 1001 of human body communication chip 100 through switch 602 and switch 601 to signal electrode 101, and the signal electrode 101 is in contact with the human body to transmit the signal through the human body to the electronic device at the opposite end. In addition, when channel 2 is closed, the overall impedance of the electronic device's transmitting end can be increased by the parallel inductor L5, so that the electronic device has a smaller transmission power and can be used in data transmission scenarios during human body communication.

[0118] For example, Figure 6BAs shown, when switch 601 and switch 602 are connected to channel three to close channel three, it means that the electronic device as the RX end of human body communication is connected to the parallel resonant matching inductor L5, and the inductor L5 is connected to the GND electrode 105. After the signal electrode 101 receives the signal sent by the opposite electronic device transmitted through the human body, it is directly transmitted to the RX 1002 of the human body communication chip 100 through the switch 601 and the switch 602. In addition, by connecting the inductor L5 in parallel, the electronic device can have a larger receiving power, thereby enhancing the signal receiving effect of human body communication.

[0119] In this way, the electronic device can be switched to different working states by switching the switch to meet the communication needs of the human body.

[0120] It can be understood that the inductance mentioned in the embodiments of the present application can be an adjustable inductance, and the inductance value range can be 1nH-1mH, and the present application does not limit this. By adjusting the adjustable inductance, the different capacitance requirements of the electronic device at a distance from the human body can be met. For example, when the distance is close, the capacitance demand is large due to the conductivity of the human body, and the capacitance can be increased by adjusting the adjustable inductance to increase the inductance value; when the distance is far, the capacitance demand is low, and the capacitance can be reduced by adjusting the adjustable inductance to reduce the inductance value. In addition, by adjusting the adjustable inductance, the electronic device can also use different frequency bands (for example, 13.56MHz frequency band, 27.12MHz frequency band, etc.) for human body communication. In addition, in the method of the present application, the adjustable inductance can be replaced by a fixed inductance and an adjustable capacitor.

[0121] It is understandable that DCDC technology will increase the number of components, layout difficulty and debugging complexity of the circuit in the electronic device, increase the system cost, and may cause EMC risks. However, the communication circuit mentioned in this application can be switched to different resonant working states to meet different power requirements during human body communication, the system cost is low, and there will be no EMC risks. Among them, the first resonant working state: select channel one in the electronic device as the signal sending end, that is, connect an inductor in series in the TX end loop of the human body communication equivalent circuit; select channel three in the electronic device as the signal receiving end, that is, connect an inductor in parallel in the RX end loop of the human body communication equivalent circuit to form a branch circuit.

[0122] The second resonant working state: select channel two in the electronic device serving as the signal transmitting end, that is, connect an inductor in parallel in the TX end loop of the human body communication equivalent circuit to form a branch circuit; select channel three in the electronic device serving as the signal receiving end, that is, connect an inductor in parallel in the RX end loop of the human body communication equivalent circuit to form a branch circuit.

[0123] It can be understood that at the receiving end of the human body communication circuit, the loop capacitance in the circuit loop may change with factors such as temperature and voltage, affecting the capacitor voltage and circuit performance and stability. In the communication circuit in the embodiment of the present application, an inductor can be used at the receiving end to form a parallel branch with the receiving end circuit, so that the overall impedance is larger to offset the effect of the change in loop capacitance on the circuit.

[0124] The following is based on Figure 7 The first resonant working state mentioned above is briefly introduced.

[0125] like Figure 7 As shown, at the TX end in the human body communication equivalent circuit, an inductor L11 is matched in series, wherein the inductor L11 will generate a certain resistance (i.e., R11) during communication; and at the RX end, an inductor L12 is matched in parallel, wherein the inductor L12 will generate a certain resistance (i.e., R12) during communication. The inductor L11 may be a circuit element in the power boost module mentioned above, and the inductor L12 may be a circuit element in the signal receiving module mentioned above.

[0126] Specifically, Figure 7 As shown, the human body is equivalent to a capacitor C3 connected to the ground; there is a capacitor C4 between the signal electrode at the TX end and the suspended GND electrode, and the GND electrode is connected to the ground through the capacitor C1. In addition, when the electronic device is used as the TX end, it will also provide a power supply voltage V1 and generate a certain resistance (i.e., R1) during communication. An inductor L11 and an equivalent resistor R11 are connected in series between the resistor R1 and the signal electrode at the TX end; at the RX end of human body communication, there is a capacitor C5 between the signal electrode at the RX end and the GND electrode, and the GND electrode is connected to the ground through the capacitor C2. In addition, when the electronic device is used as the RX end, it can be approximated to an equivalent resistor (i.e., R2), and an inductor L12 and an equivalent resistor R12 are connected to form a parallel branch circuit with the resistor R2.

[0127] Among them, the TX-end series matching inductor L11 can be that when the TX-end transmits a signal to the human body, the current starts from the power supply voltage V1, flows through the inductor L11 to the signal electrode of the TX-end, and then flows to the human body, that is, the inductor L11 and the signal electrode of the TX-end and the human body are on the same circuit path. The RX-end parallel matching inductor L12 can be that when the human body transmits a signal to the RX-end, the current passes through the RX-end signal electrode in contact with the human body, and branches to the inductor L12 and the RX-end resistor R2, that is, the inductor L12 and the receiving end resistor of the human body communication are in different branch circuits.

[0128] Formula (IV) shows the transmission power P of human body communication in the first resonant working state mentioned in this application: TX 1 is calculated as follows:

[0129]

[0130] Among them, P TX 1 is the output power of the TX end in the first resonant working state, that is, the transmission power of human body communication; P TX is the transmission power of the initial human body communication; V TX is the output voltage of the TX terminal, that is, the voltage value of the power supply voltage V1; R P is the resistance value of resistor R11; Q P is the inductance value of inductor L11; W is the angular frequency of human body communication; C TX is the capacitance value of capacitor C4.

[0131] It can be understood that after an inductor L11 is connected in series at the TX end, the transmission power of the human body communication increases to Q of the original human body communication transmission power. P times, Q P is the inductance value of the inductor L11. Therefore, in the touch detection scenario of human body communication, this resonant working state can be used to meet the larger power consumption requirements generated by high-precision work.

[0132] Formula (V) and Formula (VI) show the received power P of human body communication in the first resonant working state mentioned in this application: RX 1 is calculated as follows:

[0133]

[0134]

[0135] Among them, P RX 1 is the received power of human body communication in the first resonant working state; P RX is the received power of the initial human body communication; V RX 1 is the voltage value across the resistor R2, that is, the receiving end voltage during human body communication in the first resonant working state; V RX is the receiving end voltage of the initial human body communication; C ret(RX) is the capacitance value of capacitor C2; C ret(TX) is the capacitance value of capacitor C1; C RX is the capacitance value of capacitor C5; C body is the capacitance value of capacitor C3; Q P is the inductance value of inductor L11; Q L is the inductance value of inductor L12; V TX is the voltage value of the power supply voltage V1; R RX is the impedance of resistor R2.

[0136] It can be understood that in the human body communication in the first resonant working state mentioned in the present application, by connecting a series inductor L11 in series at the TX end and connecting an inductor L12 in parallel at the RX end, the received power of the human body communication is increased to (Q P Q L ) 2 times, enhancing the signal reception effect of human communication, Q P is the inductance value of inductor L11; Q L is the inductance value of inductor L12.

[0137] The following is based on Figure 8 The second resonant working state mentioned above is briefly introduced.

[0138] like Figure 8 As shown, at the TX end in the human body communication equivalent circuit, an inductor L21 is matched in parallel, wherein the inductor L21 will generate a certain resistance (i.e., R21) during communication; and at the RX end, an inductor L22 is matched in parallel, wherein the inductor L22 will generate a certain resistance (i.e., R22) during communication. The inductor L21 may be a circuit element in the power reduction module mentioned above, and the inductor L12 may be a circuit element in the signal receiving module mentioned above.

[0139] Specifically, Figure 8 As shown, the human body is equivalent to a capacitor C3 connected to the ground; there is a capacitor C4 between the signal electrode at the TX end and the suspended GND electrode, and the GND electrode is connected to the ground through the capacitor C1. In addition, when the electronic device is used as the TX end, it will also provide a power supply voltage V1 and generate a certain resistance (i.e., R1) during communication. An inductor L21 and an equivalent resistor R21 are connected to the capacitor C4 to form a parallel branch circuit; at the RX end of the human body communication, there is a capacitor C5 between the signal electrode at the RX end and the GND electrode, and the GND electrode is connected to the ground through the capacitor C2. In addition, when the electronic device is used as the RX end, it can be approximated to an equivalent resistor (i.e., R2). An inductor L22 and an equivalent resistor R22 are connected to the resistor R2 to form a parallel branch circuit.

[0140] The TX-end parallel matching inductor L21 can be that when the TX-end transmits a signal to the human body, the current starts from the power supply voltage V1 and branches to the inductor L21 and the TX-end signal electrode, that is, the inductor L21 and the TX-end signal electrode are in different branch circuits. The RX-end parallel matching inductor L22 can be that when the human body transmits a signal to the RX-end, the current passes through the RX-end signal electrode in contact with the human body and branches to the inductor L22 and the RX-end resistor R2, that is, the inductor L22 and the receiving-end resistor of the human body communication are in different branch circuits.

[0141] Formula (VII) shows the transmission power P of human body communication in the second resonant working state mentioned in this application: TX 2 calculation method:

[0142]

[0143] Among them, P TX 2 is the output power of the TX end in the second resonant working state, that is, the transmission power of human body communication; P TX is the transmission power of the initial human body communication; V TX is the voltage value of the power supply voltage V1; R P ' is the resistance value of resistor R21; Q P ' is the inductance value of inductor L21; W is the angular frequency of human body communication; C TX is the capacitance value of capacitor C4.

[0144] It can be understood that after an inductor L21 is connected in parallel at the TX end, the transmission power of human body communication is reduced to 1 / Q of the original human body communication transmission power. P ', Q P ' is the inductance value of the inductor L21. Therefore, in the data transmission scenario of human body communication, this resonant working state can be used to meet the smaller power consumption requirement.

[0145] Formula (eight) and formula (nine) show the received power P of human body communication in the second resonant working state mentioned in this application: RX 2 calculation method:

[0146]

[0147]

[0148] Among them, P RX 2 is the received power of human body communication in the second resonant working state; P RX is the received power of the initial human body communication; V RX 2 is the voltage value across the resistor R2, that is, the receiving end voltage during human body communication in the second resonant working state; V RX is the receiving end voltage of the initial human body communication; C ret(RX) is the capacitance value of capacitor C2; C ret(TX) is the capacitance value of capacitor C1; C RX is the capacitance value of capacitor C5; C body is the capacitance value of capacitor C3; Q L ' is the inductance value of inductor L22; V TX is the voltage value of the power supply voltage V1; R RX is the impedance of resistor R2.

[0149] It can be understood that in the human body communication in the second resonant working state mentioned in the present application, by connecting a series L21 in parallel at the TX end and an inductor L22 in parallel at the RX end, the received power of the human body communication is increased to (Q L ′) 2 times, enhancing the signal reception effect of human communication, Q L ' is the inductance value of inductor L22.

[0150] It can be understood that when the voltage at the transmitting end is fixed, series resonant matching or parallel resonant matching can be selected for different transmission power requirements. Table 1 shows the working state performance of human body communication under two resonant working states and original human body communication. Specifically, as shown in Table 1.

[0151] Table 1:

[0152]

[0153]

[0154] It can be understood that in some embodiments, when two electronic devices communicate with each other through the human body of a user, if the power supply voltage and other circuit components of the signal transmitting end remain unchanged, an inductor L11 is connected in series at the TX end and an inductor L12 is connected in parallel at the RX end (that is, the electronic device as the signal transmitting end selects channel one and the electronic device as the signal receiving end selects channel three), the transmission power of the human body communication can be increased to Q of the original human body communication transmission power. P times, which can meet the larger transmission power requirements in the touch detection scenario of human body communication; at the same time, the receiving voltage is increased to Q of the original human body communication receiving voltage P Q L times, the received power increases to (Q P Q L ) 2 times, enhancing the signal reception effect of human communication. P is the inductance of inductor L11, Q L is the inductance value of inductor L12.

[0155] It can be understood that in some embodiments, when two electronic devices communicate with each other through the human body of a user, if the power supply voltage and other circuit components of the signal transmitting end remain unchanged, an inductor L21 is connected in parallel to the TX end and an inductor L22 is connected in parallel to the RX end (that is, the electronic device as the signal transmitting end selects channel 2 and the electronic device as the signal receiving end selects channel 3), the transmission power of the human body communication can be reduced to 1 / Q of the original human body communication transmission power. P', to meet the smaller transmission power requirements in the human body communication data transmission scenario; at the same time, the receiving voltage increases to Q of the original human body communication receiving voltage L ' times, the received power increases to (Q L ′) 2 times, enhancing the signal reception effect of human communication. P ' is the inductance value of inductor L21, Q L ' is the inductance value of inductor L22.

[0156] In this way, different human body communication needs can be met by adopting different circuit channels mentioned in the embodiments of the present application for human body communication.

[0157] Correspondingly, based on the above communication circuit, the embodiment of the present application also provides a communication method. In the method of the present application, after reaching the detection cycle or receiving the instruction of human body communication, the electronic device can control the switch to turn on the TX end, power boost module and signal electrode (i.e., conduction channel one) of the human body communication chip, and send a detection signal to the surrounding to find the opposite electronic device; after detecting that a human body communication connection is established with the opposite electronic device, when the electronic device needs to send data to the opposite electronic device, the electronic device can control the switch to turn on the TX end, power reduction module and signal electrode (i.e., conduction channel two) of the human body communication chip; when the electronic device does not need to send data, the electronic device can control the switch to turn on the RX end, signal receiving module and signal electrode (i.e., conduction channel three) of the human body communication chip, and wait to receive data from the opposite electronic device.

[0158] It can be understood that in some embodiments, the two electronic devices that establish human body communication can be called a local electronic device and a peer electronic device.

[0159] In some embodiments, the electronic device at this end can transmit a detection signal at regular intervals to detect the electronic device at the other end that is performing human body communication, that is, the touch detection stage of human body communication. At this time, the multi-way switch in the electronic device at this end will switch to channel one, indicating that the electronic device at this end is a signal transmitting end in a series resonant matching working state, and the electronic device at this end will have a larger transmission power; if the multi-way switch of the electronic device at the other end is switched to channel three at this time, the electronic device at the other end will receive the detection signal sent by the electronic device at this end and respond, then the electronic device at this end successfully detects the electronic device at the other end that is performing human body communication. In addition, the electronic device at this end can also control the electronic device at this end to transmit the detection signal by any means such as the human body communication button. For example, when the electronic device at this end detects that the user turns on the human body communication button, the electronic device at this end transmits a detection signal to the surrounding area to detect the electronic device at the other end. The embodiments of the present application do not limit this.

[0160] In some embodiments, after a human body communication connection is established between a local electronic device and a peer electronic device, if the local electronic device sends data to the peer electronic device, the multi-way switch in the local electronic device will switch to channel two, indicating that the local electronic device is in the TX end of a parallel resonant matching working state, and the local electronic device will have a smaller transmission power; if the multi-way switch of the peer electronic device is switched to channel three at this time, the peer electronic device will receive the data sent by the local electronic device, and the local electronic device and the peer electronic device can successfully transmit data.

[0161] In some embodiments, if the local electronic device receives data sent by the opposite electronic device, the multi-way switch in the local electronic device will switch to channel three. For example, if the opposite electronic device sends a detection signal to the surroundings, the detection signal can be received when the multi-way switch of the local electronic device is switched to channel three, so as to respond to the detection signal to establish a human body communication connection. For another example, after the local electronic device establishes a human body communication connection with the opposite electronic device, if the opposite electronic device sends data to the local electronic device, the data can be received when the multi-way switch of the local electronic device is switched to channel three, thereby realizing data transmission.

[0162] In some embodiments, the switching of the multi-way switch may be controlled by an operating system or a processor in the electronic device.

[0163] In some embodiments, Fig. 9 As shown, electronic devices are usually at the RX end of human body communication for a longer period of time, responsible for receiving, decoding and processing signals transmitted from other electronic devices; electronic devices are generally only at the TX end of human body communication for a shorter period of time, sending detection signals to the surroundings or sending data to other electronic devices.

[0164] The following is based on Fig.10 The flow chart shown in FIG. 1 briefly introduces the communication method in the embodiment of the present application. Fig.10 Specifically, the communication method may be performed by an electronic device (or referred to as a local electronic device), and the method includes the following steps:

[0165] S1001: A touch detection instruction is detected.

[0166] It can be understood that in the embodiment of the present application, detecting a touch detection instruction may refer to reaching a detection cycle or receiving a human body communication instruction.

[0167] It can be understood that in the embodiment of the present application, the electronic device can search for the other electronic device to establish human body communication at regular intervals; in addition, the electronic device can also control the activation of human body communication by receiving user instructions. For example, the electronic device can detect the user's operation instruction to activate the human body communication button. The embodiment of the present application does not limit this.

[0168] S1002: Control the human body communication switch to turn on the TX end, power boost module and signal electrode of the human body communication chip.

[0169] It can be understood that in the embodiment of the present application, after the electronic device reaches the detection cycle or receives the human body communication instruction, the electronic device will turn on the TX end, the power boosting module and the signal electrode of the human body communication chip, that is, the multi-way switch of the internal human body communication circuit will be switched to the TX end series resonant matching channel (that is, the channel one mentioned above), indicating that the electronic device is in the signal sending end of the series resonant matching working state.

[0170] In some embodiments, after the electronic device switches the switch of the human body communication circuit to the TX-end series resonant matching channel, the electronic device will have a larger transmission power.

[0171] S1003: Send out a detection signal.

[0172] It can be understood that in the embodiment of the present application, after the electronic device switches the switch in the human body communication circuit to the series resonant matching channel at the TX end, the electronic device can send a detection signal to the surrounding area to detect the other electronic device performing human body communication, that is, the touch detection stage of human body communication.

[0173] S1004: Detecting that a human body communication connection is established with the other electronic device.

[0174] It can be understood that in the embodiment of the present application, after the electronic device sends a detection signal, if the other electronic device receives the detection signal and responds at this time, a human body communication connection can be successfully established.

[0175] S1005: Determine whether data needs to be sent. If yes, proceed to S1006; if no, proceed to S1008.

[0176] It can be understood that in the embodiment of the present application, after the electronic device establishes a human body communication connection with the opposite electronic device, the electronic device needs to determine whether it needs to send data to the opposite electronic device. If data needs to be sent, go to S1006 and switch the switch of the human body communication circuit to the TX-end parallel resonant matching channel; if data does not need to be sent, go to S1008 and switch the switch of the human body communication circuit to the RX-end parallel resonant matching channel.

[0177] S1006: Control the human body communication switch to turn on the TX end, the power reduction module and the signal electrode of the human body communication chip.

[0178] It can be understood that in the embodiment of the present application, when the electronic device needs to send data to the other electronic device, the electronic device will turn on the TX end, the power reduction module and the signal electrode of the human body communication chip, that is, the multi-way switch of the internal human body communication circuit will be switched to the TX end parallel resonant matching channel (that is, the channel two mentioned above), indicating that the electronic device is in the signal sending end of the parallel resonant matching working state.

[0179] In some embodiments, after the electronic device switches the switch of the human body communication circuit to the TX-end parallel resonant matching channel, the electronic device will have a smaller transmission power.

[0180] S1007: Send data to the other electronic device.

[0181] It can be understood that in the embodiment of the present application, after the electronic device switches the switch of the human body communication circuit to the TX-end parallel resonant matching channel, it can send data to the other electronic device.

[0182] S1008: Control the human body communication switch to conduct the RX end, signal receiving module and signal electrode of the human body communication chip.

[0183] It can be understood that in the embodiment of the present application, when the electronic device does not need to send data, the electronic device can turn on the RX end, signal receiving module and signal electrode of the human body communication chip, that is, switch the multi-way switch of the internal human body communication circuit to the RX end parallel resonant matching channel (that is, channel three mentioned above).

[0184] S1009: Waiting to receive data sent by the opposite electronic device.

[0185] It can be understood that in the embodiment of the present application, after the electronic device switches the switch of the human body communication circuit to the RX-end parallel resonant matching channel, the data sent by the opposite electronic device can be received.

[0186] In this way, through the above steps, the human body communication needs with the other electronic device can be achieved.

[0187] It can be understood that the above-mentioned communication circuit and communication method of the present application can be applied to electronic devices, wherein the electronic device can be a mobile phone, a tablet computer, a laptop computer, a wearable device (for example, including: a watch, a smart ring, a bracelet, a pedometer, etc.), a car, an Internet of Things (IoT) device (for example, including: a weight scale, an oven, etc.), a smart door lock, and any other electronic device that can communicate with the human body. The form of the electronic device is not specifically limited in the embodiments of the present application.

[0188] like Fig.11 As shown, a hardware structure diagram of an electronic device 1100 according to an embodiment of the present application is exemplified. Fig.11 As shown, the electronic device 1100 may include a processor 110, a power module 140, a memory 180, a mobile communication module 130, a wireless communication module 120, a sensor module 190, an audio module 150, a camera 170, an interface module 160, a button 210, a display screen 220, a touch screen 230, and the like.

[0189] It is to be understood that the structure illustrated in the embodiment of the present application does not constitute the only possible implementation method for the electronic device 1100. In other embodiments of the present application, the electronic device 1100 may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0190] The processor 110 may include one or more processing units, for example, a processing module or processing circuit including a central processing unit (CPU), a digital signal processor, a microprocessor (MCU), or a field programmable gate array (FPGA). Different processing units may be independent devices or integrated into one or more processors.

[0191] A storage unit may also be provided in the processor 110 for storing instructions and data. In some embodiments, the storage unit in the processor 110 is a cache memory 180, which may store instructions or data that have just been used or are cyclically used by the processor 110. If the processor 110 needs to use the instruction or data again, it may be directly called from the storage unit, thereby avoiding repeated access, reducing the waiting time of the processor 110, and thus improving the efficiency of the system.

[0192] The controller can generate operation control signals according to the instruction operation code and timing signal to complete the control of instruction fetching and execution.

[0193] It can be understood that in the embodiment of the present application, the processor can be used to execute the method steps performed by the local electronic device and the opposite electronic device in the communication method of the present application.

[0194] The power module 140 may include a power source, a power management component, etc. The power source may be a battery. The power management component is used to manage the charging of the power source and the power supply of the power source to other modules. In some embodiments, the power management component includes a charging management module and a power management module. The charging management module is used to receive charging input from the charger; the power management module is used to connect the power source, and the charging management module is connected to the processor 110. The power management module receives input from the power source and / or the charging management module, and supplies power to the processor 110, the display screen 220, the camera 170, and the wireless communication module 120, etc.

[0195] The mobile communication module 130 may include, but is not limited to, an antenna, a power amplifier, a filter, a low noise amplifier (LAN), etc. The mobile communication module 130 may provide a solution for wireless communications including 2G / 3G / 4G / 5G, etc., applied to the electronic device 1100. The mobile communication module 130 may receive electromagnetic waves through an antenna, filter, amplify, etc. the received electromagnetic waves, and transmit them to a modulation and demodulation processor for demodulation.

[0196] The wireless communication module 120 may include an antenna, and transmit and receive electromagnetic waves via the antenna. The wireless communication module 120 may provide wireless communication solutions including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth, global navigation satellite system (GNSS), frequency modulation (FM), near field communication technology (NFC), infrared technology (IR), etc., which are applied to the electronic device 1100. The electronic device 1100 may communicate with the network and other devices through wireless communication technology.

[0197] The display screen 220 is used to display a human-computer interaction interface, images, videos, etc. The display screen 220 includes a display panel. The audio module 150 is used to convert a digital audio signal into an analog audio signal output, or convert an analog audio input into a digital audio signal.

[0198] The sensor module 190 may include a proximity light sensor, a pressure sensor, a gyro sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, a bone conduction sensor, an electromagnetic wave absorption rate sensor, a sound sensor, etc. The interface module 160 includes an external memory interface, a universal serial bus (USB) interface, etc.

[0199] In some embodiments, the electronic device 1100 further includes a button 210, a motor, and an indicator. The button 210 may include a volume button, an on / off button, etc. The motor is used to make the electronic device 1100 produce a vibration effect, and different application scenarios (e.g., time reminder, receiving information, alarm clock, game, etc.) may correspond to different vibration feedback effects. The indicator may include a laser indicator, a radio frequency indicator, a light emitting diode (LED) indicator, etc.

[0200] It is understood that the various embodiments disclosed in the present application can be implemented in hardware, software, firmware, or a combination of these implementation methods. In the accompanying drawings, some structural or method features may be shown in a specific arrangement and / or order. However, it should be understood that such a specific arrangement and / or order may not be required. Instead, in some embodiments, these features may be arranged in a manner and / or order different from that shown in the accompanying drawings of the specification. In addition, the inclusion of structural or method features in a specific figure does not mean that such features are required in all embodiments, and in some embodiments, these features may not be included or may be combined with other features.

[0201] It should be noted that the units / modules mentioned in the various device embodiments of the present application are all logical units / modules. Physically, a logical unit / module can be a physical unit / module, or a part of a physical unit / module, or can be implemented as a combination of multiple physical units / modules. The physical implementation method of these logical units / modules themselves is not the most important. The combination of functions implemented by these logical units / modules is the key to solving the technical problems proposed by the present application. In addition, in order to highlight the innovative part of the present application, the above-mentioned device embodiments of the present application do not introduce units / modules that are not closely related to solving the technical problems proposed by the present application, which does not mean that there are no other units / modules in the above-mentioned device embodiments.

[0202] It should be noted that in the examples and description of this patent, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0203] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the present application.

Claims

1. A communication circuit, characterized in that: include: A communication chip, a power boost module, a power reduction module, a first switch module and a first electrode; wherein the communication chip is a human body communication chip, and the first electrode is a signal electrode in contact with the human body; The first switch module is connected to the first electrode; The power boosting module is connected to the transmitting end of the communication chip and the first switch module respectively. When the first switch module turns on the transmitting end of the communication chip, the power boosting module and the first electrode, the communication circuit works in the touch detection process, and the power boosting module is used to increase the transmission power of the communication circuit; The power reduction module is respectively connected to the transmitting end of the communication chip and the first switch module. When the first switch module turns on the transmitting end of the communication chip, the power reduction module and the first electrode, the communication circuit operates in the data transmission process, and the power reduction module is used to reduce the transmission power of the communication circuit.

2. The circuit according to claim 1, characterized in that The circuit further includes: a signal receiving module; wherein, The signal receiving module is connected to the receiving end of the communication chip and the first switch module respectively, and is used to receive a signal when the first switch module switches on the receiving end of the communication chip, the signal receiving module and the first electrode.

3. The circuit according to claim 1, characterized in that The power boost module includes a first inductor, wherein a first end of the first inductor is connected to a transmitting end of the communication chip, and a second end of the first inductor is connected to the first switch module.

4. The circuit according to claim 1, characterized in that The power reduction module includes a first circuit path and a second circuit path; wherein, The first circuit path is respectively connected to the transmitting end of the communication chip and the first switch module; The second circuit path is respectively connected to a transmitting end of the communication chip and the ground.

5. The circuit according to claim 4, characterized in that The second circuit path includes a second inductor and a second electrode; wherein, The second electrode is a grounding electrode, which is used to connect to the earth; A first end of the second inductor is connected to a transmitting end of the communication chip, and a second end of the second inductor is connected to the second electrode.

6. The circuit according to claim 2, characterized in that The signal receiving module includes a third circuit path and a fourth circuit path; wherein, The third circuit path is connected to the receiving end of the communication chip and the first switch module respectively; The fourth circuit paths are respectively connected to the first switch module and the ground.

7. The circuit according to claim 6, characterized in that The fourth circuit path includes a third inductor and a third electrode; wherein, The third electrode is a grounding electrode, which is used to connect to the earth; A first end of the third inductor is connected to the first switch module, and a second end of the third inductor is connected to the third electrode.

8. The circuit according to claim 1, characterized in that The circuit also includes a second switch module; wherein, The first end of the second switch module is connected to the power reduction module; The second end of the second switch module is used to connect to the transmitting end of the communication chip to increase the transmitting power of the communication circuit, or to connect to the receiving end of the communication chip to receive signals.

9. The circuit according to claim 8, characterized in that The power reduction module includes a fifth circuit path and a sixth circuit path; wherein, The fifth circuit path is used to conduct the transmitting end of the communication chip and the first electrode, or to conduct the receiving end of the communication chip and the first electrode; The sixth circuit path includes a fourth inductor and a fourth electrode, wherein the fourth inductor is connected to the fourth electrode, and the fourth electrode is grounded.

10. The circuit according to any one of claims 1 to 7, characterized in that: The first switch module is used to switch on the transmitting end of the communication chip, the power boosting module and the first electrode when a touch detection instruction is detected; The first switch module is used to switch on the transmitting end of the communication chip, the power reduction module and the first electrode when a data transmission instruction is detected; The first switch module is used to conduct the receiving end of the communication chip, the signal receiving module and the first electrode when a signal receiving instruction is detected.

11. The circuit according to claim 1, characterized in that The first electrode is used to transmit a signal when in contact with a human body.

12. The circuit according to claim 3, characterized in that The first inductor is an adjustable inductor.

13. A communication method, characterized in that: For use in a communication circuit according to any one of claims 1 to 12, the method comprising: When a touch detection instruction is detected, the first switch module is controlled to turn on the transmitting end, the power boosting module and the first electrode of the communication chip to increase the transmitting power of the communication circuit; When a data transmission instruction is detected, the first switch module is controlled to turn on the transmitting end of the communication chip, the power reduction module and the first electrode to reduce the transmission power of the communication circuit.

14. The method according to claim 13, characterized in that The method further comprises: When a signal receiving instruction is detected, the first switch module is controlled to conduct the receiving end of the communication chip, the signal receiving module and the first electrode to receive a signal.

15. An electronic device, characterized in that: The electronic device comprises the communication circuit according to any one of claims 1-12.

16. An electronic device, characterized in that: include: A memory and a processor, wherein the memory is used to store instructions executed by one or more processors of the electronic device, and the processor is one of the one or more processors of the electronic device, and is used to execute the communication method described in claim 13 or 14.

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