Wireless bluetooth earphone charging case system and communication method thereof

Abstract

A wireless Bluetooth earphone charging case system includes: a wireless Bluetooth earphone, comprising: an earphone controller, a first switch coupled to and controlled by the earphone controller, and a second switch coupled to the first switch; and a charging case removably coupled to the wireless Bluetooth earphone, the charging case comprising: a charging case controller, a third switch coupled to and controlled by the charging case controller, and a fourth switch coupled to the third switch, coupled to a voltage divider circuit to divide a voltage source to generate a node voltage. In a charging state, the first switch, the second switch, the third switch, and the fourth switch are on, and the node voltage is a first voltage value. In a communication state, the first switch, the second switch, the third switch, and the fourth switch are off, and the node voltage is a second voltage value, the first voltage value being higher than the second voltage value.

Description

[0001] This application is a divisional application. The original application was filed on February 4, 2020; the application number is 202010079644.X; and the invention title is: Wireless Bluetooth Earphone Charging Case System and Communication Method Thereof. Technical Field

[0002] This invention relates to a Bluetooth headset charging case system and its communication method. Background Technology

[0003] With social progress and the improvement of people's living standards, headphones have become an indispensable part of daily life. Traditional wired headphones can restrict the wearer's movement, which is especially inconvenient during exercise. Although ordinary Bluetooth headphones eliminate the connection between the headphones and smart devices, a connection still exists between the left and right earpieces. Wireless Bluetooth headphones communicate with each other via Bluetooth, achieving true wireless connectivity.

[0004] However, due to the extremely small size of wireless Bluetooth earbuds, only very small-capacity lithium-ion batteries can be placed inside. Because of this battery capacity limitation, manufacturers typically include a dedicated charging case to extend the battery life of the wireless Bluetooth earbuds.

[0005] The charging case and the wireless Bluetooth earbuds need to communicate with each other to exchange information. Therefore, this invention provides a wireless Bluetooth earbud charging case system and its communication method to improve communication between the charging case and the wireless Bluetooth earbuds. Summary of the Invention

[0006] This invention relates to a wireless Bluetooth earphone charging case system and its communication method, which utilizes a time-division two-way half-duplex mode to improve the communication speed and accuracy between the charging case and the wireless Bluetooth earphone, while also reducing the hardware cost of the charging case and the wireless Bluetooth earphone.

[0007] Based on an example of this case, a communication method for a wireless Bluetooth earphone charging case system is proposed, comprising: a charging case actively entering a communication mode; temporarily ending a charging mode of the charging case and allowing the charging case to wait for a period of time; when a wireless Bluetooth earphone determines that a charging stop event has been detected and determines that a node voltage between the charging case and the wireless Bluetooth earphone is equal to a predetermined value, temporarily ending a charging mode of the wireless Bluetooth earphone and allowing the wireless Bluetooth earphone to enter a communication mode; and after the communication between the charging case and the wireless Bluetooth earphone ends, causing the charging case and the wireless Bluetooth earphone to return to the charging mode, so that the charging case can charge the wireless Bluetooth earphone.

[0008] Based on an example of this case, a communication method for a wireless Bluetooth earphone charging case system is proposed, comprising: a wireless Bluetooth earphone actively entering a communication mode; the wireless Bluetooth earphone causing a charging current to be less than a current threshold; when a charging case detects that the charging current is less than the current threshold, temporarily ending a charging mode of the charging case and causing the charging case to wait for a period of time; when the wireless Bluetooth earphone determines that a charging stop event has been detected and determines that a node voltage between the charging case and the wireless Bluetooth earphone is equal to a predetermined value, temporarily ending a charging mode of the wireless Bluetooth earphone; and after the communication between the charging case and the wireless Bluetooth earphone ends, causing the charging case and the wireless Bluetooth earphone to return to the charging mode, so that the charging case can charge the wireless Bluetooth earphone.

[0009] According to an example of this case, a wireless Bluetooth headset charging case system is proposed, comprising: a wireless Bluetooth headset, including: a headset controller, a first switch coupled to and controlled by the headset controller, and a second switch coupled to the first switch; and a charging case, removably coupled to the wireless Bluetooth headset, the charging case including: a charging case controller, a third switch coupled to and controlled by the charging case controller, and a fourth switch coupled to the third switch, coupled to a voltage divider circuit to divide a voltage source to generate a node voltage. In a charging state, the first switch, the second switch, the third switch, and the fourth switch are on, and the node voltage is a first voltage value. In a communication state, the first switch, the second switch, the third switch, and the fourth switch are off, and the node voltage is a second voltage value, the first voltage value being higher than the second voltage value.

[0010] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description

[0011] Figure 1 This is a circuit diagram of a wireless Bluetooth earphone charging case system according to an embodiment of the present invention.

[0012] Figure 2 This is a schematic diagram of the charging mode of a wireless Bluetooth earphone charging case system according to an embodiment of this case.

[0013] Figure 3 This is a schematic diagram of the communication mode of a wireless Bluetooth earphone charging case system according to an embodiment of this case.

[0014] Figure 4 This is a flowchart of a charging case active communication method for a wireless Bluetooth headset charging case system according to an embodiment of this case.

[0015] Figure 5 This is a flowchart of a wireless Bluetooth earphone active communication method for a wireless Bluetooth earphone charging case system according to an embodiment of the present invention.

[0016] In the attached figures, the following labels are used:

[0017] 100: Wireless Bluetooth Earphone Charging Case System

[0018] 110: Wireless Bluetooth Earphones

[0019] 120: Charging case

[0020] 111: Headphone Controller

[0021] Q1-Q7: Switches

[0022] R1-R4, Rsense: Resistors

[0023] Cin: Capacitance

[0024] P1-P4: Pin connections

[0025] 121: Charging Case Controller

[0026] 122: Voltage divider circuit

[0027] 410-460, 510-565: Steps Detailed Implementation

[0028] The structural and working principles of the present invention will be described in detail below with reference to the accompanying drawings:

[0029] The technical terms used in this specification refer to those commonly used in the field. Where this specification provides explanations or definitions for certain terms, the interpretation of those terms shall be based on the explanations or definitions provided in this specification. Each embodiment of the present invention has one or more technical features. Where feasible, those skilled in the art may selectively implement some or all of the technical features in any embodiment, or selectively combine some or all of the technical features in these embodiments.

[0030] Figure 1 This diagram shows a circuit diagram of a wireless Bluetooth earphone charging case system according to an embodiment of the present invention. Figure 1 As shown, the wireless Bluetooth earphone charging case system 100 includes a wireless Bluetooth earphone 110 and a charging case 120. The coupling between the wireless Bluetooth earphone 110 and the charging case 120 is removable. In this embodiment, the wireless Bluetooth earphone 110 can be either the left or right earphone, and the left and right earphones communicate with each other via Bluetooth.

[0031] The wireless Bluetooth headset 110 includes: a headset controller 111, switches Q1, Q2, Q6, a resistor R1, a capacitor Cin, a first charging and communication pin P1, and a first grounding pin P2.

[0032] The charging case 120 includes: a charging case controller 121, switches Q3, Q4, Q5, Q7, a voltage divider circuit 122, resistor R4 and sensing resistor Rsense, a second charging and communication pin P3 and a second ground pin P4. The voltage divider circuit 122 includes, for example, resistors R2 and R3.

[0033] In the following description, switches Q2 and Q4 are PMOS transistors, while switches Q1, Q3, and Q5-Q7 are NMOS transistors. Of course, this case is not limited to this.

[0034] Switch Q1 includes: a gate coupled to node N1 of the headphone controller 111; a source grounded; and a drain coupled to resistor R1 and the gate of switch Q2. The gate of switch Q1 receives a control signal CN1 output from node N1 of the headphone controller 111. When the wireless Bluetooth headset 110 is in a charging state, the control signal CN1 controls switch Q1 to be on; and when the wireless Bluetooth headset 110 is in a communication state, the control signal CN1 controls switch Q1 to be off.

[0035] Switch Q2 includes: a gate coupled to the drain of switch Q1 and resistor R1; a source coupled to the headphone controller 111; and a drain coupled to the node voltage VBUS. Switch Q2 is on when the wireless Bluetooth headset 110 is charging; and off when the wireless Bluetooth headset 110 is in communication mode. Furthermore, switch Q2 can also disconnect the effect of capacitor Cin on the node voltage VBUS in communication mode. The node voltage VBUS is the node voltage between the first charging and communication pin P1 and the second charging and communication pin P3.

[0036] Switch Q6 includes: a gate coupled to signal VIO1; a source coupled to nodes N2 and N3 of the headphone controller 111; and a drain coupled to the node voltage VBUS. Switch Q6 acts as a level shifter, converting between the high-level node voltage VBUS and the low-level UART signal. That is, the wireless Bluetooth headset 110 and the charging case 120 can send or receive UART signals; the low-level UART signal is converted to the higher-level node voltage VBUS by switches Q6 and Q7. Nodes N2 and N6 can be UART signal input terminals, while nodes N3 and N7 can be UART signal output terminals. In other words, switch Q6 remains on, whether in charging or communication mode.

[0037] Resistor R1 is coupled between the gate and source of switch Q2. Capacitor Cin is coupled between node N4 of headphone controller 111 and ground.

[0038] Switch Q3 includes: a gate coupled to node N5 of the charging case controller 121; a source coupled to ground; and a drain coupled to the gate of switch Q4. The gate of switch Q3 receives a control signal CN2 output from node N5 of the charging case controller 121. When the charging case 120 is in a charging state, the control signal CN2 controls switch Q3 to be turned on; and when the charging case 120 is in a charging state, the control signal CN2 controls switch Q3 to be turned off.

[0039] Switch Q4 includes: a gate coupled to the drain of switch Q3; a source coupled to a voltage source VDD (e.g., but not limited to 5V); and a drain coupled to a node voltage VBUS. Switch Q4 is on when the charging case 120 is in a charging state; and off when the charging case 120 is in a charging state.

[0040] Switch Q5 includes: a gate coupled to a voltage source VDD via resistor R4; a source coupled to ground; and a drain coupled to voltage divider circuit 122. When the charging case 120 is in a charging state, switch Q5 is off; and when the charging case 120 is in a charging state, switch Q5 is on. Switch Q5 is a selective element, allowing the charging case 120 to save power.

[0041] Switch Q7 includes: a gate coupled to signal VIO2; a source coupled to nodes N6 and N7 of the charging case controller 121; and a drain coupled to the node voltage VBUS. Switch Q7 acts as a level shifter to convert the high-level node voltage VBUS to a low-level voltage. That is, switch Q7 remains on, whether in charging or communication mode.

[0042] Voltage divider circuit 122 includes resistors R2 and R3. Resistor R2 is coupled between the voltage source VDD and the node voltage VBUS. Resistor R3 is coupled between the node voltage VBUS and the drain of switch Q5. Voltage divider circuit 122 can divide the voltage source VDD into the node voltage VBUS. For example, when resistors R2 and R3 have the same resistance value, if the voltage source VDD is 5V, then the node voltage VBUS is 2.5V. It should be noted that this invention is not limited to this.

[0043] Resistor R4 is coupled between voltage source VDD and gate of switch Q5.

[0044] The sensing resistor Rsense is coupled between node GND and ground, and is also coupled to the charging case controller 121. The charging case controller 121 can detect the voltage across the resistor Rsense to determine whether the wireless Bluetooth headset 110 is placed inside the charging case 120; and to determine whether the wireless Bluetooth headset 110 emits an active communication signal.

[0045] Based on the charging current IBUS, the charging case controller 121 can determine whether the left or right earbud is placed in the charging case 120. After determining which earbud is in the charging case 120, the charging case controller 121 decides how to communicate. Alternatively, based on the charging current IBUS, the charging case controller 121 can determine whether the wireless Bluetooth earbuds 110 are almost fully charged, and then the charging case controller 121 communicates with the wireless Bluetooth earbuds 110 to confirm whether the wireless Bluetooth earbuds 110 are truly fully charged.

[0046] The wireless Bluetooth earphone 110 and the charging case 120 are physically and electrically connected via four pins P1-P4. When the wireless Bluetooth earphone 110 is placed inside the charging case 120, the first charging and communication pin P1 and the second charging and communication pin P3 are electrically connected, and the charging case 120 charges the wireless Bluetooth earphone 110 through the contacting first charging and communication pins P1 and P3. Furthermore, the charging case 120 and the wireless Bluetooth earphone 110 also communicate through the contacting first charging and communication pins P1 and P3. In other words, the communication signals transmitted and received between the earphone controller 111 and the charging case controller 121 are transmitted through: switch Q6, the first charging and communication pins P1 and P3, and switch Q7.

[0047] The communication between the charging case 120 and the wireless Bluetooth earphones 110 includes time-division two-way and half-duplex communication.

[0048] Figure 2 This diagram illustrates the charging mode of the wireless Bluetooth headset charging case system according to an embodiment of this case. In charging mode, control signal CN1 controls switch Q1 to be on, and control signal CN2 controls switch Q3 to be on. Since switch Q1 is on, the gate of switch Q2 is grounded, therefore switch Q2 is on. Similarly, since switch Q3 is on, the gate of switch Q4 is grounded, therefore switch Q4 is on. Since switch Q3 is on, the gate of switch Q5 is grounded, therefore switch Q5 is off. When charging, the node voltage VBUS is approximately equal to the potential of the voltage source VDD (because switch Q4 is on).

[0049] Figure 3This diagram illustrates the communication mode of the wireless Bluetooth earphone charging case system according to an embodiment of this case. In communication mode, control signal CN1 controls switch Q1 to be open and control signal CN2 controls switch Q3 to be open. Since switch Q1 is open, the VGS of switch Q2 is insufficient to turn it on, thus switch Q2 is open. Similarly, since switch Q3 is open, the gate voltage of switch Q5 is almost equal to the voltage source VDD, so switch Q5 is on. Since switch Q3 is open, almost no current flows through resistor R4, so the gate voltage of switch Q4 is almost equal to the voltage source VDD, thus switch Q4 is open. Therefore, in communication mode, the node voltage VBUS = VDD * R3 / (R2 + R3) because switch Q5 is on. If we assume VDD is 5V and resistors R2 and R3 have equal resistance values, then in communication mode, the node voltage VBUS = VDD * R3 / (R2 + R3) = 2.5V.

[0050] Therefore, the headphone controller 111 can determine whether it is in charging mode or communication mode by detecting the node voltage VBUS.

[0051] Please refer to this case. Figure 4 The diagram shows a flowchart of a charging case active communication method for a wireless Bluetooth headset charging case system according to an embodiment of this invention. In step 410, the charging case 120 actively enters a communication mode. In step 415, the switch Q4 of the charging case 120 (for ease of explanation, Q4 can also be referred to as a charging switch) is turned off to temporarily end the charging mode of the charging case 120, and the charging case controller 121 waits for a period of time. In step 420, the headset controller 111 determines whether a "charging stop event" is detected and whether the node voltage VBUS is a predetermined value. Here, a "charging stop event" means that when the headset controller 111 detects that the node voltage VBUS is lower than a threshold (if VDD is 5V, then the threshold is, for example, but not limited to, 4V), the headset controller 111 recognizes it as a "charging stop event". When the headset controller 111 recognizes it as a "charging stop event", the headset controller 111 further determines whether the node voltage VBUS is a predetermined value. Here, a predetermined value means, for example, ... Figure 3When in communication mode, the node VBUS value is (e.g., but not limited to 2.5V). If the wireless Bluetooth headset 110 is actually removed from the charging case 120, the node voltage VBUS detected by the headset controller 111 will be 0V. That is, in step 420, when the headset controller 111 determines that a "charging stop event" has been detected, the headset controller 111 will decide whether the wireless Bluetooth headset 110 is removed from the charging case 120 (node ​​voltage VBUS is below 0.5V) or whether the charging case 120 intends to communicate with the wireless Bluetooth headset 110 (node ​​voltage VBUS is 2.5V) based on whether the detected node voltage VBUS is below a real exit threshold. When the detected node voltage VBUS is below a real exit threshold, the headset controller 111 decides that the wireless Bluetooth headset 110 is removed from the charging case 120 (i.e., a real exit event occurs).

[0052] If step 420 is true (headphone controller 111 detects a "stop charging event" and the node voltage VBUS is the predetermined value), headphone controller 111 controls the wireless Bluetooth headset 110 to enter communication mode. Therefore, in step 425, switch Q2 (for ease of explanation, Q2 can also be called a charging switch) is turned off to temporarily end the charging mode of the wireless Bluetooth headset 110.

[0053] In step 430, the charging case 120 transmits and receives communication signals. In step 435, the wireless Bluetooth earphone 110 enters communication mode to transmit and receive communication signals. That is, in steps 430 and 435, the charging case 120 and the wireless Bluetooth earphone 110 communicate with each other.

[0054] In step 440, the charging case 120 determines whether the communication has ended. In step 445, the wireless Bluetooth earphone 110 determines whether the communication has ended. If the communication has not ended, the charging case 120 and the wireless Bluetooth earphone 110 continue to communicate. If the communication has ended, in step 450, control switch Q4 is turned on to allow the charging case 120 to return to charging mode; and in step 455, control switch Q2 is turned on to allow the wireless Bluetooth earphone 110 to return to charging mode. In step 460, both the charging case 120 and the wireless Bluetooth earphone 110 are in charging mode, so that the charging case 120 charges the wireless Bluetooth earphone 110.

[0055] In this embodiment, the charging case 120 initiates active communication, for example, when it determines that the wireless Bluetooth earphone 110 is nearing full charge. The charging case 120 and the wireless Bluetooth earphone 110 can then communicate to confirm this. Once the wireless Bluetooth earphone 110 is fully charged, through communication between the charging case 120 and the earphone 110, to save power, the charging case 120 can turn off the voltage source VDD, and the wireless Bluetooth earphone 110 can also enter a very deep sleep mode to save power.

[0056] Please refer to this case. Figure 5 The diagram shows a flowchart of a wireless Bluetooth earphone active communication method according to an embodiment of the present invention's wireless Bluetooth earphone charging case system. In step 510, the wireless Bluetooth earphone 110 actively enters a communication mode. In step 515, the earphone controller 111 sets the charging current IBUUS to be less than a current threshold (e.g., but not limited to 1mA). In step 520, when the charging case controller 121 detects that the charging current IBUUS is less than the current threshold (the charging case 120 may determine that the wireless Bluetooth earphone 110 is fully charged via fast charging, but this is not the case at this time), the charging case controller 121 controls the switch Q4 of the charging case 120 to be turned off to temporarily end the charging mode of the charging case 120, and the charging case controller 121 waits for a period of time.

[0057] In step 525, the headphone controller 111 determines whether a "charging stop event" has been detected and whether the node voltage VBUS is the predetermined value. The details of step 525 may be the same as or similar to those of step 420, so the details are omitted here.

[0058] If step 525 is true (headphone controller 111 detects a "stop charging event" and the node voltage VBUS is the predetermined value), in step 530, headphone controller 111 sets switch Q2 to off to temporarily end the charging mode of wireless Bluetooth headphones 110.

[0059] In step 535, the charging case 120 enters communication mode to transmit and receive communication signals. In step 540, the wireless Bluetooth earphone 110 transmits and receives communication signals. That is, in steps 535 and 540, the charging case 120 and the wireless Bluetooth earphone 110 communicate with each other.

[0060] In step 545, the charging case 120 determines whether the communication has ended. In step 550, the wireless Bluetooth earphone 110 determines whether the communication has ended. If the communication has not ended, the charging case 120 and the wireless Bluetooth earphone 110 continue to communicate. If the communication has ended, in step 555, control switch Q4 is turned on to allow the charging case 120 to return to charging mode; and in step 560, control switch Q2 is turned on to allow the wireless Bluetooth earphone 110 to return to charging mode. In step 565, both the charging case 120 and the wireless Bluetooth earphone 110 are in charging mode, so that the charging case 120 charges the wireless Bluetooth earphone 110.

[0061] In this embodiment, the premise for the wireless Bluetooth headset 110 to initiate communication may be that the wireless Bluetooth headset 110 is connected to a mobile phone (or other smart device), and the mobile phone wants to know the remaining battery level of the charging case 120. After communication between the charging case 120 and the wireless Bluetooth headset 110, the wireless Bluetooth headset 110 informs the mobile phone of the remaining battery level of the charging case 120 via Bluetooth, and the remaining battery level of the charging case 120 can be displayed on the mobile phone.

[0062] As can be seen from the above, in this embodiment, since the number of communication / charging receptions between the charging case 120 and the wireless Bluetooth headset 110 can be reduced, the hardware cost of the charging case 120 and the wireless Bluetooth headset 110 can be reduced.

[0063] Furthermore, as shown in the communication method of this embodiment, the communication time is relatively fast and the accuracy of communication can be improved. This is because the charging case 120 and the wireless Bluetooth headset 110 are relatively accurate in determining whether to enter the communication mode.

[0064] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A method for communication between a wireless Bluetooth earphone charging case system, characterized in that, The charging case actively enters a communication mode. temporarily ending a charging mode of the charging case and making the charging case wait for a period of time; temporarily ending a charging mode of the wireless Bluetooth earphone when the wireless Bluetooth earphone judges that a stop charging event is detected and that a node voltage between the charging case and the wireless Bluetooth earphone is equal to a predetermined value; and after the charging case and the wireless Bluetooth earphone end the communication, making the charging case and the wireless Bluetooth earphone return to the charging mode to charge the wireless Bluetooth earphone by the charging case, wherein the wireless Bluetooth earphone detects the node voltage to judge whether in the charging mode or the communication mode; the wireless Bluetooth earphone decides that the wireless Bluetooth earphone is removed from the charging case or that the charging case wants to communicate with the wireless Bluetooth earphone according to the detected node voltage being lower than a real ejection threshold or the predetermined value; wherein the node voltage VBUS of the communication mode is VDD*R3 / (R2+R3), wherein VDD is a voltage source, R2 and R3 are resistors of a voltage dividing circuit, and if the wireless Bluetooth earphone is removed from the charging case, the detected node voltage VBUS will be 0; wherein the wireless Bluetooth earphone includes a first switch, the charging case is removably coupled to the wireless Bluetooth earphone, includes a second switch, and is coupled to a voltage source to generate the node voltage, in the charging mode, the first switch and the second switch are turned on, and the node voltage is a first voltage value; and in the communication mode, the first switch and the second switch are turned off, and the node voltage is a second voltage value, the first voltage value being higher than the second voltage value. controlling a charging switch of the charging case to be turned off to temporarily end the charging mode of the charging case.

2. The method of claim 1, wherein the wireless Bluetooth earpiece charging case system is a Bluetooth earpiece charging case system. controlling a charging switch of the wireless Bluetooth earphone to be turned off to temporarily end the charging mode of the wireless Bluetooth earphone. 3.The method of claim 1, wherein, 4. The communication method of the wireless Bluetooth earphone charging case system of claim 1, wherein the wireless Bluetooth earphone judges that the stop charging event is detected when the wireless Bluetooth earphone detects that the node voltage is lower than a threshold value; and the wireless Bluetooth earphone judges that a real ejection event is detected when the wireless Bluetooth earphone detects that the node voltage is lower than the real ejection threshold value. controlling a charging switch of the charging case to be turned on to make the charging case return to the charging mode. controlling a charging switch of the wireless Bluetooth earphone to be turned on to make the wireless Bluetooth earphone return to the charging mode.

5. The method of claim 1, wherein the wireless Bluetooth earpiece charging case system is a Bluetooth earpiece charging case system. The wireless Bluetooth earphone actively enters a communication mode.

6. The method of claim 1, wherein the wireless Bluetooth earpiece charging case system is a Bluetooth earpiece charging case system. The wireless Bluetooth earphone makes a charging current less than a current threshold value.

7. A method for communication of a wireless Bluetooth earpiece charging case system, the method comprising: temporarily ending a charging mode of the charging case when the charging case detects that the charging current is less than the current threshold value and making the charging case wait for a period of time; temporarily ending a charging mode of the wireless Bluetooth earphone when the wireless Bluetooth earphone judges that a stop charging event is detected and that a node voltage between the charging case and the wireless Bluetooth earphone is equal to a predetermined value; and after the charging case and the wireless Bluetooth earphone end the communication, making the charging case and the wireless Bluetooth earphone return to the charging mode to charge the wireless Bluetooth earphone by the charging case, wherein the wireless Bluetooth earphone detects the node voltage to judge whether in the charging mode or the communication mode; the wireless Bluetooth earphone decides that the wireless Bluetooth earphone is removed from the charging case or that the charging case wants to communicate with the wireless Bluetooth earphone according to the detected node voltage being lower than a real ejection threshold or the predetermined value; wherein the node voltage VBUS of the communication mode is VDD*R3 / (R2+R3), wherein VDD is a voltage source, R2 and R3 are resistors of a voltage dividing circuit, and if the wireless Bluetooth earphone is removed from the charging case, the detected node voltage VBUS will be 0; wherein the wireless Bluetooth earphone includes a first switch, the charging case is removably coupled to the wireless Bluetooth earphone, includes a second switch, and is coupled to a voltage source to generate the node voltage, in the charging mode, the first switch and the second switch are turned on, and the node voltage is a first voltage value; and in the communication mode, the first switch and the second switch are turned off, and the node voltage is a second voltage value, the first voltage value being higher than the second voltage value. after the charging case and the wireless Bluetooth earphone end the communication, the charging case and the wireless Bluetooth earphone return to the charging mode, so that the charging case charges the wireless Bluetooth earphone, wherein the wireless Bluetooth earphone detects the node voltage to determine whether in the charging mode or the communication mode; the wireless Bluetooth earphone determines that the wireless Bluetooth earphone is removed from the charging case or the charging case wants to communicate with the wireless Bluetooth earphone according to the detected node voltage being lower than a real ejection threshold value or the predetermined value; wherein the node voltage of the communication mode is VBUS=VDD*R3 / (R2+R3), wherein VDD is a voltage source, R2 and R3 are resistors of a voltage dividing circuit, and if the wireless Bluetooth earphone is removed from the charging case, the detected node voltage VBUS will be 0; wherein, the wireless Bluetooth earphone includes a first switch, the charging case is removably coupled to the wireless Bluetooth earphone, the charging case includes a second switch, and is coupled to a voltage source to generate the node voltage, in the charging mode, the first switch and the second switch are turned on, and the node voltage is a first voltage value; and in the communication mode, the first switch and the second switch are turned off, and the node voltage is a second voltage value, the first voltage value being higher than the second voltage value.

8. The method of claim 7, wherein the wireless Bluetooth earpiece charging case system is a Bluetooth earpiece charging case system. The charging switch of the charging case is controlled to be turned off to temporarily end the charging mode of the charging case.

9. The method of claim 7, wherein the wireless Bluetooth earpiece charging case system is a Bluetooth earpiece charging case system. The charging switch of the wireless Bluetooth earphone is controlled to be turned off to temporarily end the charging mode of the wireless Bluetooth earphone.

10. The communication method of the wireless Bluetooth earphone charging case system of claim 7, wherein, when the wireless Bluetooth earphone detects that the node voltage is lower than a threshold value, the wireless Bluetooth earphone determines that the stop charging event is detected; and when the wireless Bluetooth earphone detects that the node voltage is lower than the real ejection threshold value, the wireless Bluetooth earphone determines that a real ejection event is detected.

11. The method of claim 7, wherein the wireless Bluetooth earpiece charging case system is configured to communicate via Bluetooth Low Energy (BLE) protocol. The charging switch of the charging case is controlled to be turned on to make the charging case return to the charging mode.

12. The method of claim 7, wherein the wireless Bluetooth earpiece charging case system is configured to communicate via Bluetooth Low Energy (BLE) protocol. The charging switch of the wireless Bluetooth earphone is controlled to be turned on to make the wireless Bluetooth earphone return to the charging mode.

13. A wireless Bluetooth earpiece charging case system, characterized in that, including: a wireless Bluetooth earphone, including: an earphone controller, a first switch coupled and controlled by the earphone controller; and a charging case, removably coupled to the wireless Bluetooth earphone, the charging case including: a charging case controller, a second switch coupled and controlled by the charging case controller, and coupled to a voltage source to generate a node voltage, wherein in a charging mode, the first switch and the second switch are turned on, and the node voltage is a first voltage value; and in a communication mode, the first switch and the second switch are turned off, and the node voltage is a second voltage value, the first voltage value being higher than the second voltage value, wherein the wireless Bluetooth earphone detects the node voltage to determine whether in the charging mode or the communication mode; The wireless Bluetooth earphone determines that the wireless Bluetooth earphone is removed from the charging case or that the charging case intends to communicate with the wireless Bluetooth earphone according to the detected node voltage being lower than a real ejection threshold value or a predetermined value; Wherein, the node voltage VBUS of the communication mode = VDD*R3 / (R2+R3), wherein VDD is a voltage source, R2 and R3 are resistors of a voltage dividing circuit, and if the wireless Bluetooth earphone is removed from the charging case, the detected node voltage VBUS will be 0.

14. The wireless Bluetooth earphone charging case system of claim 13, wherein, The earphone controller detects the node voltage to determine whether in the charging mode or the communication mode; When the earphone controller detects that the node voltage is lower than a threshold value, the earphone controller determines that a stop charging event is detected; And When the earphone controller detects that the node voltage is lower than the real ejection threshold value, the earphone controller determines that a real ejection event is detected.

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