A charging and communication co-line system and earphone product

Abstract

The present invention discloses a charging and communication co-line system and an earphone product, including a charging device and an electrical product; the charging device includes a main charging interface, a power output circuit and a main controller; the power output circuit is connected to the positive pole of the main charging interface through a first switch; the main controller is connected to the positive pole of the main charging interface through a second switch; the electrical product includes a slave charging interface, a charging circuit and a slave controller; the charging circuit is connected to the positive pole of the slave charging interface through a third switch, and is used to receive the charging power output by the charging device to charge the battery in the electrical product; the slave controller is connected to the positive pole of the slave charging interface through a fourth switch. The present invention realizes the dual functions of transmitting charging current and communication signals on a single connection line. When this technology is applied to earphone products, while satisfying the charging function and communication function of the charging box for the earphone, the number of contacts between the earphone and the charging box can also be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of direct current charging, and in particular, relates to a co-linear circuit design of a charging circuit and a communication circuit between a charging device and an electrical product, and an earphone product based on the co-linear circuit design. Background Art

[0002] With the rapid development of headphone technology, dual-ear wireless headphones and neck-wire headphones are becoming more and more popular and smaller in size. Due to the limitation of the size of the headphones themselves, traditional charging interfaces (such as USB interfaces, etc.) cannot be installed and used on dual-ear wireless headphones and neck-wire headphones due to their large size. Therefore, these headphones usually use contact charging interfaces and are used in conjunction with special adapters or charging boxes.

[0003] When using an adapter or charging box to charge binaural wireless headphones or neckline headphones, in order to obtain a better charging control effect, it is necessary to design a charging interface and a communication interface on the headphones and the adapter or charging box respectively, use the charging interface to transmit the charging current, and use the communication interface to exchange control instructions to improve the reliability of the charging process. However, setting up a charging interface and a communication interface on the headphones and the adapter or charging box at the same time will lead to an increase in the number of contacts, and the design cost and reliability risk of the headphones will increase exponentially with the increase in the number of contacts. Therefore, how to design a single contact interface on the headphone product that can both charge and communicate is of great significance. Summary of the invention

[0004] The object of the present invention is to provide a charging and communication co-line system, which can realize the transmission of charging current and communication signals on the same line, so as to reduce the number of interfaces or contacts arranged on the charging device and the electrical product.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] In one aspect, the present invention provides a charging and communication co-line system, comprising a charging device and an electrical product; the charging device comprises a main charging interface, a power output circuit and a main controller; the power output circuit is used to generate charging power and is connected to the positive pole of the main charging interface through a first switch; the main controller is connected to the positive pole of the main charging interface through a second switch; the electrical product comprises a slave charging interface, a charging circuit and a slave controller; the charging circuit is connected to the positive pole of the slave charging interface through a third switch, and is used to receive the charging power output by the charging device to charge the battery in the electrical product; the slave controller is connected to the positive pole of the slave charging interface through a fourth switch; in an initial state, the first switch and the third switch are disconnected, and the second switch and the fourth switch are turned on; when the main charging interface is connected to the slave charging interface, the main controller communicates with the slave controller, determines whether to start the charging process according to the battery power, and if the charging process needs to be started, controls the first switch and the third switch to be turned on, the second switch and the fourth switch to be turned off, and starts the timed communication process until the battery power is full.

[0007] Preferably, the scheduled communication process includes: setting the scheduled communication time; when the charging time reaches the scheduled communication time, controlling the first switch and the third switch to be disconnected, and the second switch and the fourth switch to be turned on, to transmit the battery power information; if the battery is full, ending the charging process; if the battery is not full, restarting the charging process.

[0008] In order to end the charging process as soon as possible when the battery is full, the scheduled communication time is preferably determined according to the battery power, and follows the setting principle that the lower the battery power, the longer the scheduled communication time, and the higher the battery power, the shorter the scheduled communication time.

[0009] Preferably, during the communication between the main controller and the slave controller, the slave controller sends the battery power information to the main controller through the communication line, and the main controller determines whether to start the charging process; if the charging process needs to be started, the main controller sends a charging preparation data packet to the slave controller, and the slave controller replies with a response signal after receiving it, and controls the fourth switch to open and the third switch to close; after receiving the response signal, the main controller controls the second switch to open and the first switch to close, and enters the charging process.

[0010] Preferably, when the charging device detects that a useful electrical product is connected, the main controller compares the received battery power with the charging setting threshold. If it is lower than the charging setting threshold, it determines that the charging process needs to be started; otherwise, it determines that the charging process does not need to be started.

[0011] Furthermore, after the battery is fully charged, if the main charging interface and the slave charging interface remain connected, the main controller communicates with the slave controller regularly and restarts the charging process when the battery power drops below the charging set threshold.

[0012] Preferably, the charging setting threshold is preferably set to 90% of the full charge of the battery.

[0013] In order to accurately detect the access status of the charging device and the electronic product, the present invention further provides a detection circuit in the electrical product, which is connected to the positive pole of the slave charging interface; when the detection circuit detects a level change at the positive pole of the slave charging interface, it notifies the slave controller to generate an interrupt signal to the main controller; after the main controller enters the interrupt, it sends a verification data packet to the slave controller; after receiving the verification data packet, the slave controller returns a response data packet to the main controller, thereby completing the access detection of the charging device to the electrical product.

[0014] Preferably, in the timed communication process, when the main controller controls the first switch to be disconnected and the second switch to be turned on, the detection circuit detects a level change at the positive pole of the slave charging interface, and then notifies the slave controller to control the third switch to be disconnected and the fourth switch to be turned on, so as to cut off the charging line and connect the communication line.

[0015] In another aspect, the present invention also proposes an earphone product, including an earphone body and a charging box or adapter used in conjunction with the earphone body; the charging box or adapter includes a main charging interface, a power output circuit and a main controller; the power output circuit is used to generate charging power and is connected to the positive pole of the main charging interface through a first switch; the main controller is connected to the positive pole of the main charging interface through a second switch; the earphone body includes a slave charging interface, a charging circuit and a slave controller; the charging circuit is connected to the positive pole of the slave charging interface through a third switch, and is used to receive the charging power output by the charging box or adapter to charge the battery in the earphone body; the slave controller is connected to the positive pole of the slave charging interface through a fourth switch; in an initial state, the first switch and the third switch are disconnected, and the second switch and the fourth switch are turned on; when the main charging interface is connected to the slave charging interface, the main controller communicates with the slave controller to determine whether to start the charging process according to the battery power. If the charging process needs to be started, the first switch and the third switch are controlled to be turned on, the second switch and the fourth switch are disconnected, and the timed communication process is started until the battery is full.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: the present invention realizes the dual functions of transmitting charging current and communication signals on a single connection line. The application of this technology in earphone products, especially in binaural wireless earphones or neckline earphones with contact charging interfaces, can significantly reduce the number of contacts between the earphones and the charging box or adapter while satisfying the charging and communication functions of the charging box or adapter for the earphones, which not only improves the reliability of the earphone products and reduces the design cost of the earphone products, but also helps to reduce the product volume and improve the overall appearance of the earphone products.

[0017] Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a circuit principle block diagram of an embodiment of the charging and communication co-line system proposed by the present invention;

[0019] Figure 2 is based on Figure 1 The hardware circuit shown is a flowchart of an embodiment of a charging control method. DETAILED DESCRIPTION

[0020] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] This embodiment is aimed at electrical products with built-in rechargeable batteries, and proposes a common line circuit design that can transmit both charging current and communication signals on a single connection line, such as Figure 1 As shown. The co-linear circuit involves two parts, one part is arranged in the electrical product, and the other part is arranged in the charging device for charging the electrical product. Specifically, a controller, a power output circuit, a first switch S1, a second switch S2 and a charging interface are provided in the charging device. A controller, a charging circuit, a rechargeable battery and a charging interface are provided in the electrical product. In order to clearly distinguish the controller and the charging interface in the charging device and the electrical product, in this embodiment, the controller and the charging interface in the charging device are respectively referred to as the main controller and the main charging interface, and the controller and the charging interface in the electrical product are respectively referred to as the slave controller and the slave charging interface. The main charging interface and the slave charging interface may only include two plug-in terminals or contacts, the positive electrode A+ / B+ and the negative electrode A- / B-, to reduce the interface volume.

[0022] In the charging device, the power output circuit is connected to the positive electrode A+ of the main charging interface through the first switch S1, and the on-off state of the first switch S1 is changed so that the charging power output by the power output circuit can be transmitted to the positive electrode A+ of the main charging interface or the charging power is blocked from being transmitted to the positive electrode A+ of the main charging interface. The communication pin of the main controller is connected to the positive electrode A+ of the main charging interface through the second switch S2, and the on-off state of the second switch S2 is changed to connect or cut off the communication line between the main controller and the positive electrode A+ of the main charging interface.

[0023] As a preferred circuit design of this implementation example, the main controller can select its data pin for transmitting TTL level signals as the communication pin, and connect the second switch S2, specifically including the data receiving pin RX1 and the data sending pin TX1. The main controller uses its data receiving pin RX1 to receive data sent by the slave controller, and uses its data sending pin TX1 to send data to the slave controller. Preferably, the data receiving pin RX1 and the data sending pin TX1 are connected to the second switch S2 through a series resistor R1, and then connected to the positive electrode A+ of the main charging interface through the switch path of the second switch S2.

[0024] The first switch S1 and the second switch S2 are preferably controllable switches, such as transistors, field effect transistors or thyristors, which respectively receive control signals from a main controller and switch their on and off states under the control of the main controller.

[0025] In the electrical product, the positive electrode B+ of the slave charging interface is connected to the positive input terminal of the charging circuit through the third switch S3, and the on-off state of the third switch S3 is changed to transmit the charging power provided by the charging device to the charging circuit, and the battery in the electrical product is charged and stored through the charging circuit, or the charging power is directly blocked from being delivered to the charging circuit to stop the charging process of the electrical product. At the same time, the communication pin of the slave controller is also connected to the positive electrode B+ of the slave charging interface through the fourth switch S4, and the on-off state of the fourth switch S4 is changed to connect or cut off the communication line between the slave controller and the positive electrode B+ of the slave charging interface.

[0026] As a preferred circuit design of this embodiment, when the main controller selects its data pin for transmitting TTL level signals as its communication pin for interacting data with the electrical product, the slave controller should also select its data pin for transmitting TTL level signals as its communication pin for interacting data with the charging device, and respectively connect the fourth switch S4, specifically including the data receiving pin RX2 and the data sending pin TX2. The slave controller uses its data receiving pin RX2 to receive data sent by the main controller, and uses its data sending pin TX2 to send data to the main controller. In this embodiment, it is preferred that the data receiving pin RX2 and the data sending pin TX2 are connected to the fourth switch S4 through a series resistor R2, and then connected to the positive electrode B+ of the slave charging interface via the switch path of the fourth switch S4.

[0027] Similarly, the third switch S3 and the fourth switch S4 are also preferably controllable switches, such as transistors, field effect transistors or thyristors, which respectively receive control signals from the controller and switch their on and off states under the control of the controller.

[0028] In order for the charging device to detect the connection of the useful electrical product when the electrical product is connected to the charging device, a detection circuit is further provided in the electrical product in this embodiment, connected to the positive electrode B+ of the slave charging interface. When the detection circuit detects a level change on the positive electrode B+ of the slave charging interface, a detection signal is generated and sent to the slave controller, and the slave controller communicates with the main controller to further determine whether the cause of the level change is the connection of the useful electrical product to the charging device or the switching of the charging line and the communication line, so as to further improve the reliability of the charging process.

[0029] When the electrical product is connected to the charging device, the positive pole A+ of the main charging interface is connected to the positive pole B+ of the slave charging interface, and the negative pole A- of the main charging interface is connected to the negative pole B- of the slave charging interface.

[0030] Will Figure 1 The co-linear circuit shown is applied in an earphone product, for example, in a binaural wireless earphone or a neckline earphone, with the earphone body being used as the electrical product, and the charging box or adapter for charging the earphone body being used as the charging device. Thus, only one charging interface is required on the earphone body and the charging box or adapter (for binaural wireless earphones or neckline earphones using a contact charging interface, only two contacts are required) to realize the charging and communication control functions, which is conducive to the small-volume design of the earphone body.

[0031] Combine the following Figure 1 The charging and communication co-linear circuit shown in the figure elaborates on the specific charging control process, such as Figure 2 As shown, the following steps are included:

[0032] S201, in an initial state, the first switch S1 and the third switch S3 are disconnected, and the second switch S2 and the fourth switch S4 are turned on;

[0033] In this embodiment, in the default state of the charging device, the main controller controls the first switch S1 in the charging device to be disconnected, and the second switch S2 to be turned on, thereby cutting off the output path of the charging power supply, and connecting the communication pins RX1 and TX1 of the main controller to the positive electrode A+ of the main charging interface. Similarly, in the default state of the electrical product, the slave controller controls the third switch S3 in the electrical product to be disconnected, and the fourth switch S4 to be turned on, thereby cutting off the charging circuit of the charging circuit, and connecting the communication pins RX2 and TX2 of the slave controller to the positive electrode B+ of the slave charging interface.

[0034] S202, connecting the electrical product to the charging device;

[0035] Connect the main charging interface of the charging device with the secondary charging interface of the electrical product, that is, the positive poles A+ and B+ of the two charging interfaces are connected, and the negative poles A- and B- are connected. At this time, the communication line between the electrical product and the charging device is in a connected state, and the charging line is in a disconnected state.

[0036] S203, detecting the access status of the electrical product;

[0037] After the electrical product is connected to the charging device, the detection circuit in the electrical product will detect a level change on the line connected to the positive pole A+ of the slave charging interface, such as a jump from a low level to a certain high level, such as a jump to 1.8V or 3.3V. At this time, the detection circuit outputs a detection signal to the slave controller, and the slave controller sends an interrupt signal to the charging device through its data sending pin TX2 to change the level state of the data receiving pin RX1 of the main controller, so that the main controller enters an interrupt. When the main controller detects that a useful electrical product is connected through an interrupt, it sends a verification data packet to the slave controller through its data sending pin TX1. After the slave controller receives the verification data packet through its data receiving pin RX2, it returns a response data packet to the main controller through its data sending pin TX2 according to the communication protocol. After the main controller receives the response data packet through its data receiving pin RX1, the connection detection process of the electrical product is completed.

[0038] In this embodiment, it is preferred that the battery power information is written into the response data packet.

[0039] S204, judging whether the power-consuming product needs to be charged according to the battery power;

[0040] In this embodiment, a charging setting threshold is set, and the charging setting threshold is preferably set to 90% or more of the full battery power. After receiving the response data packet sent by the slave controller, the main controller extracts the battery power information from the response data packet and compares it with the charging setting threshold. If the battery power is lower than the charging setting threshold, the subsequent charging process is performed; if the battery power is equal to or higher than the charging setting threshold, it means that the battery power is sufficient and there is no need to charge the battery, and the process directly jumps to step S207.

[0041] S205, disconnect the communication line, connect the charging line, and start the charging process;

[0042] When the main controller determines that the electrical product needs to be charged, it first sends a charging preparation data packet to the slave controller; after receiving the data packet, the slave controller replies to the main controller with a response signal, and controls the fourth switch S4 to be disconnected and the third switch S3 to be closed. After receiving the response signal, the main controller controls the second switch S2 to be disconnected and the first switch S1 to be closed. As a result, the charging line between the charging device and the electrical product is connected, the communication line is disconnected, and the charging process begins. During the charging process, the power output circuit in the charging device outputs the charging power (for example, +5V, +9V or other DC power of the required amplitude) through the first switch S1, the positive pole A+ of the main charging interface, the positive pole B+ of the slave charging interface, and the third switch S3 to the charging circuit in the electrical product, and the battery in the electrical product is charged through the charging circuit.

[0043] S206, start the scheduled communication process until the battery is fully charged;

[0044] During the charging process, in order to end the charging process in time after the battery is fully charged and avoid overcharging of the battery, which affects the service life, this embodiment designs a timed communication process. During the charging process, the charging line between the charging device and the power-consuming product is cut off at a fixed time, and the communication line between the two is connected, and whether to continue the charging process is determined according to the battery power.

[0045] The specific process is:

[0046] (1) Set scheduled communication time;

[0047] The scheduled communication time can be a fixed value, which can be pre-written into the device before the charging device leaves the factory, so as to facilitate its use in the later actual use process. However, considering that the remaining power of the battery is different, the charging time required is also different. Therefore, in order to set a more suitable scheduled communication time, the present embodiment preferably adjusts the scheduled communication time adaptively according to the battery power, and follows the principle that the lower the battery power, the longer the set scheduled communication time; the higher the battery power, the shorter the set scheduled communication time. In other words, during the charging process of the battery, as the battery power increases, the scheduled communication time gradually shortens, showing a dynamic change process. In the present embodiment, the correspondence between the battery power and the scheduled communication time can be calculated by a formula, or by looking up a comparison table. The present embodiment is not limited to the above examples.

[0048] (2) Start the timer to monitor the charging time;

[0049] In this embodiment, it is preferred that a main controller in the charging device is used to start a timer to perform the task of monitoring the charging time.

[0050] (3) When the charging time reaches the scheduled communication time, the charging line is cut off, the communication line is connected, and the battery power information is transmitted;

[0051] In this embodiment, when the main controller detects that the charging time reaches the set timed communication time, it first controls the first switch S1 to be disconnected and the second switch S2 to be turned on, thereby blocking the transmission of the charging power to the main charging interface. At this time, the detection circuit in the electrical product will detect that the level on the charging line has changed, such as jumping from 5V to 1.8V, etc., thereby generating a detection signal and sending it to the slave controller to notify the slave controller to control the third switch S3 to be disconnected and the fourth switch S4 to be turned on, thereby connecting the communication line between the charging device and the electrical product, and the slave controller sends a battery power data packet to the main controller.

[0052] (4) Determine whether to end the charging process based on the battery power;

[0053] After receiving the battery power data packet, the main controller parses the battery power data packet and determines whether the battery power is full. If the battery power is full, the charging process ends. If the battery power is not full, the scheduled communication time is re-determined according to the current battery power, and the charging process is restarted. That is, the main controller first sends a charging preparation data packet to the slave controller; after receiving it, the slave controller replies to the main controller with a response signal, and controls the fourth switch S4 to be disconnected and the third switch S3 to be closed. After receiving the response signal, the main controller controls the second switch S2 to be disconnected and the first switch S1 to be closed, and reconnects the charging line between the charging device and the electrical product, disconnects the communication line, and enters the charging process again. Then, return to process (2) and repeat processes (2)-(4) until the battery power is full and the charging process ends.

[0054] S207, running a timed query process to regularly query the battery power of the electric product while the electric product is connected to the charging device;

[0055] Considering that after the charging of an electrical product stops, the battery power will gradually decrease due to the power consumption of the product. When the battery power drops below the charging setting threshold, for example, when it drops below 90% of the full battery power, the charging process should be restarted to replenish the battery. To this end, this embodiment designs a timed query process. When the charging device detects that an electrical product is connected and the charging process is not started, the main controller feeds back the battery power information from the controller according to the set time timing requirements, and determines whether the charging process needs to be started based on the battery power, that is, returns to step S204 for execution.

[0056] When the electrical product is disconnected from the charging device, the entire charging control process ends.

[0057] The above charging control process is applied to binaural wireless earphones (or neckline earphones) and charging boxes (or adapters). Through a single connection line, both the charging function of the charging box and the earphones and the communication function between the two can be realized. This can significantly reduce the number of contacts between the earphones and the charging box, solving the problem of increased earphone design costs and reduced reliability due to increased contacts.

[0058] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A charging and communication co-line system, characterized in that: Including charging devices and electricity-using products; The charging device comprises a main charging interface, a power output circuit and a main controller; the power output circuit is used to generate charging power and is connected to the positive electrode of the main charging interface through a first switch; the main controller is connected to the positive electrode of the main charging interface through a second switch; The electrical product comprises a slave charging interface, a charging circuit and a slave controller; the charging circuit is connected to the positive electrode of the slave charging interface through a third switch, and is used to receive the charging power output by the charging device to charge the battery in the electrical product; the slave controller is connected to the positive electrode of the slave charging interface through a fourth switch; In the initial state, the first switch and the third switch are disconnected, and the second switch and the fourth switch are connected; when the master charging interface is connected to the slave charging interface, the master controller communicates with the slave controller to determine whether to start the charging process according to the battery power. If the charging process needs to be started, the first switch and the third switch are controlled to be turned on, the second switch and the fourth switch are disconnected, and the timed communication process is started until the battery power is full; The timing communication process includes: Set scheduled communication time; When the charging time reaches the scheduled communication time, the first switch and the third switch are controlled to be disconnected, and the second switch and the fourth switch are controlled to be turned on, so as to transmit the battery power information; If the battery is full, the charging process ends; If the battery is not fully charged, restart the charging process.

2. The charging and communication co-line system according to claim 1, characterized in that: The scheduled communication time is determined according to the battery power, and follows the setting principle that the lower the battery power, the longer the scheduled communication time, and the higher the battery power, the shorter the scheduled communication time.

3. The charging and communication co-line system according to claim 1 or 2, characterized in that: During the communication between the master controller and the slave controller, the slave controller sends the battery power information to the master controller through the communication line, and the master controller determines whether to start the charging process; If the charging process needs to be started, the master controller sends a charging preparation data packet to the slave controller, and the slave controller replies with a response signal after receiving it, and controls the fourth switch to be opened and the third switch to be closed; After receiving the response signal, the main controller controls the second switch to open and the first switch to close, and enters the charging process.

4. The charging and communication co-line system according to claim 3, characterized in that: When the charging device detects that a useful electrical product is connected, the main controller compares the received battery power with the charging setting threshold. If it is lower than the charging setting threshold, it determines that the charging process needs to be started; Otherwise, it is determined that there is no need to start the charging process.

5. The charging and communication co-line system according to claim 4, characterized in that: After the battery is fully charged, if the main charging interface and the slave charging interface remain connected, the main controller communicates with the slave controller regularly and restarts the charging process when the battery power drops below the charging set threshold.

6. The charging and communication co-line system according to claim 5, characterized in that: The charging setting threshold is 90% of the full battery power.

7. The charging and communication co-line system according to claim 4, characterized in that: The electrical product also includes a detection circuit connected to the positive electrode of the slave charging interface; when the detection circuit detects a level change at the positive electrode of the slave charging interface, it notifies the slave controller to generate an interrupt signal to send to the master controller; After the master controller enters the interrupt, it sends a verification data packet to the slave controller; After receiving the verification data packet, the slave controller returns a response data packet to the master controller, completing the access detection of the charging device to the electrical product.

8. The charging and communication co-line system according to claim 7, characterized in that: In the timed communication process, when the main controller controls the first switch to be disconnected and the second switch to be turned on, the detection circuit detects a level change at the positive pole of the slave charging interface, and then notifies the slave controller to control the third switch to be disconnected and the fourth switch to be turned on, so as to cut off the charging line and connect the communication line.

9. An earphone product, characterized in that: It comprises a charging and communication co-line system as described in any one of claims 1 to 8, wherein the electrical product is an earphone body, and the charging device is a charging box or an adapter used in conjunction with the earphone body.

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