charging control circuit

Abstract

The application discloses a charging control circuit applied to a first electronic device, which is one of a smart ring and a smart ring charger, and comprises a connecting contact point used for connecting a second electronic device, which is the other of the smart ring and the smart ring charger; a control module electrically connected with the connecting contact point and used for conducting the connecting contact point to transmit electric energy in a charging state and conducting the connecting contact point to transmit communication data in a communication state; thus, the first electronic device is controlled to be in the charging state or the communication state by the control module, the first electronic device is controlled to transmit electric energy through the connecting contact point in the charging state, and the smart ring charger and the smart ring transmit communication data through the connecting contact point in the communication state, so that the charging and communication functions of the two are realized without increasing the connecting contact point, and the internal space of the smart ring is reduced.

Description

Technical Field

[0001] This application belongs to the field of smart rings, specifically relating to a charging control circuit. Background Technology

[0002] The development trend of smart rings is towards a simpler and more compact size, structure, and appearance, while maximizing accuracy in data acquisition and algorithms. Currently, there is no data transmission or protocol communication between the two-point magnetic charger and the smart ring; neither the charger nor the smart ring can know basic information such as the other's current battery level, charging current, and battery health. Adding a communication PIN would increase the internal circuitry of the smart ring, further reducing its internal space and hindering the placement of important components such as sensors and batteries.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this application is to provide a charging control circuit to solve the problems in related technologies, such as occupying internal space of a smart ring or the inability of the charger and the smart ring to communicate.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0006] According to one aspect of the embodiments of this application, a charging control circuit is provided, applied to a first electronic device, the first electronic device being one of a smart ring and a smart ring charger, the charging control circuit comprising: Connecting contact points for connecting a second electronic device, which is another of the smart ring and the smart ring charger; The control module is electrically connected to the connection contact point and is used to conduct electrical energy transmission through the connection contact point in the charging state, and to conduct communication data transmission through the connection contact point in the communication state.

[0007] In one embodiment of this application, the smart ring charger includes: a first communication module, the control terminal of the first communication module being used to receive control signals, a first terminal of the first communication module being connected to a power module; a second terminal of the first communication module being connected to a connection contact; the first communication module being used, in a communication state, to send a first data frame to the smart ring or receive a second data frame sent by the smart ring through the connection contact, the first data frame being used to characterize the working state of the smart ring charger, and the second data frame being used to characterize the working state of the smart ring.

[0008] In one embodiment of this application, the first communication module includes: a first switch unit, a second switch unit, and a first resistor; the control terminal of the first switch unit is used to receive a control signal, the first terminal of the first switch unit is used to receive a working voltage and is connected to one end of the first resistor, and the second terminal of the first switch unit is connected to a connecting contact and the other end of the first resistor; the control terminal of the second switch unit is used to receive a control signal, the first terminal of the second switch unit is connected to the second terminal of the first switch unit, and the second terminal of the second switch unit is grounded; the first switch unit and the second switch unit are controlled by the control signal to be turned on or off, so that the first communication module is in a charging state or a communication state.

[0009] In one embodiment of this application, the smart ring charger further includes: a first detection module; a first end of the first detection module is connected to a connection contact to obtain a first voltage on the connection contact; the first voltage and a second data frame sent by the smart ring have a corresponding relationship; a second end of the first detection module is used to receive a first reference voltage; and an output end of the first detection module is used to output a first comparison result between the first reference voltage and the first voltage.

[0010] In one embodiment of this application, the first detection module includes: a second resistor, a third resistor, and a first comparator; a first terminal of the first comparator is connected to a connection contact; a second terminal of the first comparator is connected to one end of the second resistor and one end of the third resistor, the other end of the second resistor is used to receive the operating voltage, and the other end of the third resistor is grounded; the output terminal of the first comparator is used to output a first comparison result.

[0011] In one embodiment of this application, the smart ring includes: a second communication module, wherein the control terminal of the second communication module is used to receive control signals, the first terminal of the second communication module is connected to a connection contact, and the second terminal of the second communication module is grounded; the second communication module is used to remain disconnected in a charging state so that the smart ring charger charges the smart ring through the connection contact; and in a communication state, to receive a first data frame or send a second data frame through the connection contact.

[0012] In one embodiment of this application, the second communication module includes: a third switch unit and a fourth resistor; the control terminal of the third switch unit is used to receive a control signal, the first terminal of the third switch unit is connected to one end of the fourth resistor, the second terminal of the third switch unit is grounded, and the other end of the fourth resistor is connected to a connection contact; the third switch unit is controlled by the control signal to be turned on or off, so that the second communication module is in a charging state or a communication state.

[0013] In one embodiment of this application, the smart ring further includes: a second detection module; a first end of the second detection module is connected to a connection contact point to obtain a second voltage on the connection contact point, the second voltage and the first data frame having a corresponding relationship; a second end of the second detection module is used to receive a second reference voltage; and an output end of the second detection module is used to output a second comparison result of the second voltage and the second reference voltage.

[0014] In one embodiment of this application, the second detection module includes: a fifth resistor, a sixth resistor, and a second comparator; the first terminal of the second comparator is connected to one end of the fifth resistor and one end of the sixth resistor, the other end of the fifth resistor is connected to a connection contact, and the other end of the sixth resistor is grounded; the second terminal of the second comparator is used to receive a second reference voltage; and the output terminal of the second comparator is used to output a second comparison result.

[0015] In one embodiment of this application, the connection point includes a first contact and a second contact; when the first electronic device is a smart ring charger, the first contact is connected to the second end of the first communication module, and the second contact is grounded; when the first electronic device is a smart ring, the first contact is connected to the first end of the second communication module, and the second contact is grounded.

[0016] In the technical solution of this application, a charging control circuit is applied to a first electronic device, which is one of a smart ring and a smart ring charger. The charging control circuit includes: a connection contact for connecting to a second electronic device, which is the other of the smart ring and the smart ring charger; and a control module electrically connected to the connection contact for conducting power transmission through the connection contact in the charging state and for conducting communication data transmission through the connection contact in the communication state. Thus, the control module controls the first electronic device to be in either a charging state or a communication state. In the charging state, the first electronic device is controlled to transmit power through the connection contact, and in the communication state, the smart ring charger and the smart ring conduct communication data transmission through the connection contact. This achieves the charging and communication functions of the smart ring charger and the smart ring without increasing the number of connection contacts, reducing the space occupied inside the smart ring.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0019] Figure 1 The schematic diagram illustrates the structure of a charging control circuit provided in one embodiment of this application.

[0020] Figure 2a The schematic diagram illustrates the structure of a first data frame provided in an embodiment of this application.

[0021] Figure 2b The schematic diagram illustrates the structure of a second data frame provided in an embodiment of this application.

[0022] Figure 3a A schematic diagram illustrating the communication timing provided in an embodiment of this application is shown.

[0023] Figure 3b A schematic diagram illustrating the communication timing provided in an embodiment of this application is shown.

[0024] Figure 4 The schematic diagram illustrates the structure of a charging control circuit provided in one embodiment of this application.

[0025] Figure 5 The schematic diagram illustrates the structure of a charging control circuit provided in one embodiment of this application.

[0026] Figure 6 The schematic diagram illustrates the structure of a first detection module provided in an embodiment of this application.

[0027] Figure 7 The schematic diagram illustrates the structure of a second detection module provided in one embodiment of this application.

[0028] Figure 8 The schematic diagram illustrates a flowchart of a charging control method provided in an embodiment of this application. Detailed Implementation

[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0030] like Figure 1 As shown, this application provides a charging control circuit 1, which is applied to a first electronic device, namely a smart ring charger 10 and a smart ring 20. The charging control circuit 1 includes a connection contact A and a control module. The connection contact A is used to connect to a second electronic device, which is the other of the smart ring charger 10 and smart ring 20.

[0031] If the first electronic device is a smart ring charger 10, then the control module is a first control module 110. The first control module 110 is electrically connected to the connection contact A. The first control module 110 is used to conduct electrical energy transmission through the connection contact A in the charging state and to conduct communication data transmission through the connection contact A in the communication state.

[0032] If the first electronic device is a smart ring 20, then the control module is a second control module 210. The second control module 210 is electrically connected to the connection contact A. The second control module 210 is used to conduct electrical energy transmission through the connection contact A in the charging state and to conduct communication data transmission through the connection contact A in the communication state.

[0033] The smart ring charger 10 includes a power module 111, which provides charging power to the smart ring 20 when it is charging. Conversely, when it is not charging, the power module 111 cannot provide charging power to the smart ring 20, thereby reducing problems caused by frequent switching of the power circuit.

[0034] The smart ring 20 includes a battery module 212, which receives and stores the charging energy output by the smart ring charger 10 when charging. Conversely, when not charging, the battery module 212 cannot receive the charging energy output by the smart ring charger 10, thereby reducing problems caused by frequent switching of the battery module.

[0035] Specifically, the first control module 110 controls the smart ring charger 10 to enter the charging state, and then connects the circuit between the power module 111 and the connection contact A. The second control module 210 controls the circuit between the battery module 212 and the connection contact A to be connected, thereby controlling the power module 111 to charge the battery module 212.

[0036] Furthermore, the smart ring charger 10 also includes a first communication module 112. If the first electronic device is the smart ring charger 10, the first control module 110 controls the first communication module 112 to perform data transmission in the communication state. The smart ring 20 also includes a second communication module 211. If the first electronic device is the smart ring 20, the second control module 210 controls the second communication module 211 to perform data transmission in the communication state.

[0037] In the technical solution of this application, a charging control circuit is applied to a first electronic device, which is one of a smart ring and a smart ring charger. The charging control circuit includes: a connection contact for connecting to a second electronic device, which is the other of the smart ring and the smart ring charger; and a control module electrically connected to the connection contact for conducting power transmission through the connection contact in the charging state and for conducting communication data transmission through the connection contact in the communication state. Thus, the control module controls the first electronic device to be in either a charging state or a communication state. In the charging state, the first electronic device is controlled to transmit power through the connection contact, and in the communication state, the smart ring charger and the smart ring conduct communication data transmission through the connection contact. This achieves the charging and communication functions of the smart ring charger and the smart ring without increasing the number of connection contacts, reducing the space occupied inside the smart ring.

[0038] In one embodiment of this application, a switch may be provided in the power module 111 and the battery module 212. The switch is turned on when charging and turned off when not charging, thereby controlling whether the power module outputs electrical energy or whether the battery module receives electrical energy.

[0039] In one embodiment of this application, the control terminal of the first communication module 112 is used to receive control signals output by the first control module 110. The first terminal of the first communication module is connected to the power module 111; the second terminal of the first communication module 111 is connected to the connection contact A. The first communication module 112 is used, in a communication state, to send a first data frame to the smart ring 20 or receive a second data frame sent by the smart ring 20 through the connection contact A.

[0040] Specifically, the first data frame is used to characterize the operating status of the smart ring charger 10, such as... Figure 2a As shown, the operating status of the smart ring charger 10 can include information such as the battery voltage, cover status, TYPEC status, whether the charger is fully charged, whether the charger is low on power, real-time charging current, and whether the indicator light is constantly on. This information is represented by at least one bit in the first data frame, and this data is located in the middle of the first data frame. Additionally, the header of the first data frame has a specified number of bits. The header helps the receiver identify the start position of the data frame, ensuring that the receiver can correctly parse subsequent data. The tail of the first data frame also has a specified number of bits for a checksum. A checksum is a technique used to verify data integrity; it detects whether errors have occurred during data transmission or storage by calculating a certain value in the data.

[0041] The second data frame is used to characterize the working status of the smart ring, such as Figure 2bAs shown, the operating status of the smart ring can include the smart ring's battery voltage, charger status, whether the ring is fully charged, whether the ring is low on power, and the ring's charging current. This information is represented by at least one bit in the second data frame, and this data is set in the middle of the second data frame. The second data frame also has a frame header of a specified number of bits at the beginning and a checksum of a specified number of bits at the end.

[0042] For example, such as Figure 3a As shown, in the first and second data frames, 2ms is defined as 1 bit, meaning the bidirectional transmission rate is 500Hz. A logic "1" consists of a 1.5ms high level and a 0.5ms low level, and a logic "0" consists of a 0.5ms high level and a 1.5ms low level. For example... Figure 3b As shown, the charging case header code is equivalent to the frame header, the charging case data code is the specific data located in the middle of the first data frame, and the charging case checksum is the checksum. During the waiting period, the smart ring charger controls the first communication module to switch to data receiving mode to prepare for receiving the second data frame sent by the smart ring, and the smart ring controls the second communication module to switch to data sending mode to prepare for sending the second data frame. After a preset waiting time, the smart ring sends the second data frame, where the ring data code is equivalent to the frame header, the ring data code is the specific data located in the middle of the second data frame, and the ring checksum is the checksum. "End" indicates the end of this communication process.

[0043] In one embodiment of this application, such as Figure 4 As shown, the first communication module 112 includes: a first switch unit 1121, a second switch unit 1122, and a first resistor R1. Connection point A includes a first contact CH1 and a second contact CH2; when the first electronic device is a smart ring charger, the first contact CH1 is connected to the second terminal c of the first communication module; the second contact CH2 can be directly grounded, or it can be grounded after passing through resistors R8 and R9. When the first electronic device is a smart ring, the first contact CH1 is grounded, and the second contact CH2 is connected to the first terminal of the second communication module 211.

[0044] The control terminal b of the first switching unit 1121 is used to receive the control signal P00. The first terminal a of the first switching unit 1121 is used to receive the operating voltage, which can be VCC. The first terminal a of the first switching unit 1121 is connected to one end of the first resistor R1. The second terminal c of the first switching unit can be directly connected to the first contact CH1, or it can be connected to the first contact CH1 through resistor R7. The second terminal c of the first switching unit is also connected to the other end of the first resistor R1. The control terminal d of the second switching unit is used to receive the control signal P01. The first terminal e of the second switching unit 1122 is connected to the second terminal c of the first switching unit 1121, and the second terminal f of the second switching unit is grounded. The first and second switching units are controlled by the control signal to be turned on or off, so that the first communication module is in a charging state or a communication state.

[0045] In another embodiment, the control terminal b of the first switching unit 1121 can receive the control signal P00 through resistor R10, the control terminal d of the second switching unit can receive the control signal P01 through resistor R11, and a resistor R14 is provided between the first terminal e of the second switching unit 1122 and the second terminal c of the first switching unit 1121 to limit the current and stabilize the voltage.

[0046] In one embodiment of this application, the smart ring charger further includes: a first detection module 113; a first terminal of the first detection module 113 is connected to a connection contact A to obtain a first voltage V1 on the connection contact A; when the smart ring is in a data transmission state, the first voltage V1 and the second data frame transmitted by the smart ring have a corresponding relationship. The second terminal of the first detection module is used to receive a first reference voltage CMP+. The output terminal of the first detection module is used to output a first comparison result between the first reference voltage CMP+ and the first voltage V1.

[0047] Specifically, the smart ring controls the third switch unit 2111 on the second communication module 211 to be on or off, changing the resistance value connected in the circuit and causing a voltage change in the charging control circuit, thereby sending logic "1" and logic "0" in the second data frame. Logic "1" and "0" are the smallest units of binary data. By combining multiple bits of 1 and 0, various data can be represented. Typically, a high level is used to represent logic "1" and a low level is used to represent logic "0". That is, the second data frame is determined by judging whether the first voltage V1 is high or low. Therefore, the first voltage V1 and the second data frame sent by the smart ring have a corresponding relationship. For example, when the duration of the first voltage V1 being greater than or equal to the first reference voltage CMP+ is 1.5ms, and the duration of the first voltage V1 being less than the first reference voltage CMP+ is 0.5ms, then the first comparison result indicates that a logic "1" has been identified. Conversely, if the duration of the first voltage V1 being less than the first reference voltage CMP+ is 1.5ms, and the duration of the first voltage V1 being greater than or equal to the first reference voltage CMP+ is 0.5ms, then the first comparison result indicates that a logic "0" has been detected. Assuming the data length of the second data frame is 32 bits, then by using the 32 bits of data starting from and including the frame header, the charger can parse the smart ring's operating information included in the second data frame.

[0048] For example, such as Figure 6 As shown, the first detection module 113 includes: a second resistor R2, a third resistor R3, and a first comparator 1131. The first terminal of the first comparator 1131 is connected to the connection contact A, specifically... Figure 4 The first contact CH1 is shown. The second terminal of the first comparator is connected to one end of the second resistor R2 and one end of the third resistor R3. The other end of the second resistor R2 is used to receive the operating voltage VCC, and the other end of the third resistor R3 is grounded, so that the second terminal of the first comparator obtains the first reference voltage CMP+. The output terminal of the first comparator is used to output the first comparison result.

[0049] In another embodiment, the comparison function of the first comparator 1131 is integrated into the first control module 110. The first control module 110 compares the first voltage V1 and the first reference voltage CMP+ to obtain a first comparison result. Then, the first control module 110 analyzes the data sent by the smart ring based on the first comparison result.

[0050] In one embodiment of this application, such as Figure 1As shown, the control terminal of the second communication module 211 is used to receive control signals sent by the second control module 210. The first terminal of the second communication module 211 is connected to the connection contact A, and the second terminal of the second communication module 211 is grounded. The second communication module remains disconnected in the charging state so that the smart ring charger can charge the smart ring through the connection contact; and in the communication state, it receives a first data frame or sends a second data frame through the connection contact.

[0051] For example, such as Figure 4 As shown, the second communication module 211 includes a third switch unit 2111 and a fourth resistor R4. The control terminal g of the third switch unit 2111 is used to receive the control signal DO-2 sent by the second control module 210. The first terminal i of the third switch unit 2111 is connected to one end of the fourth resistor R4, the second terminal h of the third switch unit 2111 is grounded, and the other end of the fourth resistor R4 is connected to the first contact CH1. The battery module 212 is connected to node B. When the smart ring charger normally outputs power through the connection contact, and the third switch unit is turned off, the charging power enters the battery module 212 from node B without passing through resistor R4. At this time, the second communication module is in a charging state. When the third switch unit is controlled by the control signal DO-2 to be turned on or off for a period of time, for example, the third switch unit being turned off for 0.5ms and then on for 1.5ms within 2ms represents logic "1", or the third switch unit being turned off for 1.5ms and then on for 0.5ms within 2ms represents logic "0", the second communication module 211 is in a communication state.

[0052] In one embodiment of this application, the control terminal of the third switching unit 2111 is first connected to resistor R12, and then receives control signal DO-2. The control terminal of the third switching unit 2111 is also connected to one end of resistor R13, and the other end of resistor R13 is grounded. The main functions of resistors R12 and R13 are to limit current and stabilize voltage.

[0053] In one embodiment of this application, such as Figure 1 and Figure 4 As shown, the smart ring 20 also includes a voltage divider detection module 213; the first terminal of the second detection module 213 is connected to the connection contact A to obtain the second voltage VIN on the connection contact A. When the smart ring charger is in data transmission mode, the second voltage VIN and the first data frame have a corresponding relationship. The second terminal of the second detection module 213 is used to receive the second reference voltage Vb. The output terminal of the second detection module 213 is used to output the second comparison result of the second voltage VIN and the second reference voltage Vb.

[0054] Specifically, the smart ring charger controls the first switching unit 1121 and the second switching unit 1122 on the first communication module 112 to be on or off, changing the resistance value connected in the circuit and causing a voltage change in the charging control circuit, thereby sending logic "1" and logic "0" in the first data frame. Therefore, the second voltage VIN and the first data frame sent by the smart ring charger 10 have a corresponding relationship. For example, when the duration of the second voltage VIN being greater than or equal to the second reference voltage Vb is 1.5ms, and the duration of the second voltage VIN being less than the second reference voltage Vb is 0.5ms, the second comparison result indicates that logic "1" has been identified. Conversely, when the duration of the second voltage VIN being less than the second reference voltage Vb is 1.5ms, and the duration of the second voltage VIN being greater than or equal to the second reference voltage Vb is 0.5ms, the second comparison result indicates that logic "0" has been identified.

[0055] For example, such as Figure 7 As shown, the second detection module 213 includes a fifth resistor R5, a sixth resistor R6, and a second comparator 2131. The first terminal of the second comparator 2131 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6. The other end of the fifth resistor R5 is connected to connection contact A, thereby acquiring the second voltage VIN at connection contact A when the smart ring charger is in data transmission mode. The other end of the sixth resistor R6 is grounded, making the voltage at the first terminal of the second comparator 2131 Va. The second terminal of the second comparator 2131 is used to receive a second reference voltage Vb, which can be preset to 1 / 2 Va. The output terminal of the second comparator 2131 is used to output the second comparison result.

[0056] In one embodiment of this application, the smart ring also includes a bridge rectifier module, which includes a third switch Q3, a fourth switch Q4, a fifth switch Q5, and a sixth switch Q6.

[0057] The control terminals of the third switch Q3 and the fifth switch Q5 are connected to the second contact CH2. The first terminal of the third switch Q3 is connected to the second terminal of the fifth switch Q5. The second terminal of the third switch Q3 is grounded. The first terminal of the fifth switch Q5 is connected to the fourth resistor R4 at node B.

[0058] The control terminals of the fourth switch Q4 and the sixth switch are connected to the first contact CH1. The first terminal of the fourth switch is connected to the second terminal of the sixth switch. The second terminal of the fourth switch is grounded. The first terminal of the sixth switch is connected to the fourth resistor R4 at node B.

[0059] The smart ring charger is configured to output a positive voltage at its first contact CH1 and a negative voltage at its second contact CH2. Figure 5 The diagram shows the case where the two contacts of the smart ring and the two contacts of the smart ring charger are connected in a forward orientation. In this case, the fourth and sixth switches are turned on, while the third and fifth switches are turned off. Conversely, if the two contacts of the smart ring and the two contacts of the smart ring charger are connected in a reverse orientation, the fourth and sixth switches are turned off, while the third and fifth switches are turned on. Thus, regardless of whether the contacts of the smart ring and the smart ring charger are connected in a forward or reverse orientation, the smart ring and the charger can charge and communicate normally.

[0060] The following specific examples illustrate the working principle of the charging control circuit of this application.

[0061] When the smart ring charger and the smart ring are electrically connected via connection contacts, the following steps are performed: Figure 8 The charging control flow is shown below. First, the smart ring charger executes S1 to determine that it is in a charging state. At this time, the first control module 110 controls the first switch unit 1121 to be in the conducting state and the second switch unit 1122 to be in the off state. The second control module 210 controls the third switch unit 2111 to be in the off state. In this way, the charging current output by the power module 111 can pass through the first switch unit 1121, and then through the first contact CH1 to enter the smart ring, without passing through R14 to enter the second switch unit 1122. At the same time, since the third switch unit 2111 is in the off state, the charging current enters the battery module 212 through node B.

[0062] Then, the smart ring charger executes S2, actively initiating one frame of communication code, and then enters S3. The first control module 110 controls the smart ring charger to send data, and the second control module 210 controls the third switch unit 2111 to remain off for data reception. In other words, the third switch unit 2111 remains off when it receives the conduction signal from the second control module 210. For example, in the first 1.5ms of the 2ms representing 1 bit, the first control module 110 controls the first switch unit 1121 to be off and the second switch unit 1122 to be on; in the last 0.5ms, the first control module 110 controls the first switch unit 1121 to be on and the second switch unit 1122 to be off, thereby sending a logic "0". At this time, the smart ring 20 executes S4, and the second control module 210 controls the second detection module 213 to obtain the second voltage VIN on the first contact CH1. The second voltage VIN is compared with the second reference voltage Vb. It can be analyzed that the duration of the second voltage VIN being less than the second reference voltage Vb is 1.5ms, and the duration of the second voltage VIN being greater than or equal to the second reference voltage Vb is 0.5ms. The second comparison result indicates that logic "0" is detected.

[0063] In the first 0.5ms of the 2ms interval representing 1 bit, the first control module 110 controls the first switch unit 1121 to be off and the second switch unit 1122 to be on. In the last 1.5ms, the first control module 110 controls the first switch unit 1121 to be on and the second switch unit 1122 to be off. Since the first switch unit 1121 is connected to VCC when it is on, a logic "1" is sent. By comparing the second voltage VIN with the second reference voltage Vb, it can be analyzed that the duration for which the second voltage VIN is greater than or equal to the second reference voltage Vb is 1.5ms, and the duration for which the second voltage VIN is less than the second reference voltage Vb is 0.5ms. Therefore, the second comparison result indicates that a logic "1" has been detected. It should be understood that by using the frame header, frame tail, and preset data acquisition period, the second control module 210 can determine the specific length of the first data frame, and then cache and record the second comparison results obtained in sequence.

[0064] After the smart ring 20 completes the decoding and parsing of the data frame in S4, it executes S5 to send the second data frame to the smart ring charger 10 so that the smart ring charger 10 can confirm that the communication between the two parties is normal. At this time, the smart ring charger executes S6 to wait for a reply. Before the first control module 110 determines that the second communication module 211 has completed sending, both the first switch unit 1121 and the second switch unit 1122 remain off. If the smart ring 20 does not reply normally, and the number of times the charger actively initiates the communication code has not exceeded the preset number, it can return to execute S2; otherwise, it executes S8 to exit the communication state and enter the charging state. If the smart ring 20 does not reply normally within the timeout period, the charger can execute S7 while the smart ring is executing S5, and the specific process is as follows.

[0065] Assuming the first reference voltage CMP+ < VCC and the first reference voltage CMP+ > 1 / 2 VCC, the second control module 210 controls the third switch unit 2111 to turn off to output logic "1". At this time, the fourth resistor R4 cannot form a voltage divider circuit with the first resistor R1. The first detection module obtains the first voltage CMP- at node C. The other end of the first resistor R1 is connected to the working voltage VCC, so the first voltage CMP- is VCC. This first voltage CMP- is greater than the first reference voltage CMP+, so the first detection module outputs logic "1". The second control module 210 controls the third switch unit 2111 to turn on to output logic "0". At this time, the first resistor R1 and the fourth resistor R4 form a voltage divider circuit. If resistor R7 is not set and the resistance values ​​of the first resistor R1 and the fourth resistor R4 are the same, then the first voltage CMP- is 1 / 2 VCC. This first voltage CMP- is less than the first reference voltage CMP+, so the first detection module outputs logic "0".

[0066] It should be understood that the above correspondence between logic levels and circuits is only one example. When different logic comparators or switching transistors are used, the correspondence between logic levels and circuits will change accordingly.

[0067] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0068] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A charging control circuit applied to a first electronic device, the first electronic device being one of a smart ring and a smart ring charger, characterized in that, The charging control circuit includes: A connection point is provided for connecting a second electronic device, which is another of the smart ring and the smart ring charger; The control module is electrically connected to the connection contact point and is used to conduct electrical energy transmission through the connection contact point in the charging state and to conduct communication data transmission through the connection contact point in the communication state.

2. The charge control circuit according to claim 1, characterized by, The smart ring charger includes: A first communication module, wherein the control terminal of the first communication module is used to receive control signals, the first terminal of the first communication module is connected to the power module, and the second terminal of the first communication module is connected to the connection contact point; The first communication module is used to send a first data frame to the smart ring or receive a second data frame sent by the smart ring through the connection contact point when in communication mode. The first data frame is used to characterize the working state of the smart ring charger, and the second data frame is used to characterize the working state of the smart ring.

3. The charge control circuit according to claim 2, characterized by The first communication module includes: a first switching unit, a second switching unit, and a first resistor; The control terminal of the first switching unit is used to receive control signals, the first terminal of the first switching unit is used to receive operating voltage and is connected to one end of the first resistor, and the second terminal of the first switching unit is connected to the connection contact and the other end of the first resistor. The control terminal of the second switching unit is used to receive control signals. The first terminal of the second switching unit is connected to the second terminal of the first switching unit, and the second terminal of the second switching unit is grounded. The first switching unit and the second switching unit are controlled by a control signal to be turned on or off, so that the first communication module is in a charging state or a communication state.

4. The charge control circuit according to claim 2, characterized by The smart ring charger also includes: a first detection module; The first terminal of the first detection module is connected to the connection contact point to obtain the first voltage on the connection contact point; the first voltage and the second data frame sent by the smart ring have a corresponding relationship. The second terminal of the first detection module is used to receive the first reference voltage; The output of the first detection module is used to output the first comparison result between the first reference voltage and the first voltage.

5. The charge control circuit according to claim 4, characterized by The first detection module includes: a second resistor, a third resistor, and a first comparator; The first terminal of the first comparator is connected to the connection contact point; The second terminal of the first comparator is connected to one end of the second resistor and one end of the third resistor. The other end of the second resistor is used to receive the operating voltage, and the other end of the third resistor is grounded. The output of the first comparator is used to output the first comparison result.

6. The charge control circuit according to claim 1, wherein The smart ring includes: The second communication module has a control terminal for receiving control signals, a first terminal connected to the connection contact, and a second terminal grounded. The second communication module is used to remain disconnected during charging so that the smart ring charger can charge the smart ring through the connection contact; and during communication, to receive a first data frame or send a second data frame through the connection contact.

7. The charge control circuit according to claim 6, characterized by The second communication module includes: a third switching unit and a fourth resistor; The control terminal of the third switch unit is used to receive control signals. The first terminal of the third switch unit is connected to one end of the fourth resistor, the second terminal of the third switch unit is grounded, and the other end of the fourth resistor is connected to the connection contact. The third switching unit is controlled by a control signal to be turned on or off, so that the second communication module is in a charging state or a communication state.

8. The charge control circuit according to claim 6, characterized by The smart ring also includes: a second detection module; The first end of the second detection module is connected to the connection contact point to obtain the second voltage on the connection contact point, and the second voltage has a corresponding relationship with the first data frame; The second terminal of the second detection module is used to receive the second reference voltage; The output of the second detection module is used to output a second comparison result between the second voltage and the second reference voltage.

9. The charge control circuit according to claim 8, characterized by The second detection module includes: a fifth resistor, a sixth resistor, and a second comparator; The first terminal of the second comparator is connected to one end of the fifth resistor and one end of the sixth resistor, the other end of the fifth resistor is connected to the connection contact, and the other end of the sixth resistor is grounded. The second terminal of the second comparator is used to receive the second reference voltage; The output of the second comparator is used to output the second comparison result.

10. The charge control circuit according to claim 1, characterized by, The connection points include a first contact and a second contact; When the first electronic device is a smart ring charger, the first contact is connected to the second end of the first communication module, and the second contact is grounded; When the first electronic device is a smart ring, the first contact is connected to the first end of the second communication module, and the second contact is grounded.

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