Earphone case, Bluetooth earphones and wireless communication devices

Abstract

This utility model discloses an earphone case, a Bluetooth earphone, and a wireless communication device. The earphone case includes: a charging management chip, a microcontroller, and charging pins; the charging management chip is connected to the Bluetooth earphone via the charging pins, and is also connected to the microcontroller; the charging management chip is used to receive the charging current transmitted by the charging pins and transmit the charging current to the microcontroller; the microcontroller is used to generate a boost switching signal and transmit it to the charging management chip when the amplitude of the received charging current is lower than the amplitude of the light load current; the charging management chip is also used to boost the charging voltage to obtain a target charging voltage when it receives the boost switching signal, and transmit the target charging voltage to the Bluetooth earphone for charging via the charging pins.

Description

Technical Field

[0001] This utility model relates to the field of wireless earphone technology, and in particular to earphone cases, Bluetooth earphones and wireless communication devices. Background Technology

[0002] True Wireless Stereo (TWS) earbuds all use contact charging. The power transfer efficiency of contact charging is directly related to the contact resistance. If there is dust, oil, sweat, hair, or other dirt on the contact surface, the contact resistance will increase sharply, resulting in a significant reduction in the effective current flowing into the earbud battery, thus prolonging the charging time. In severe cases, dirt may cause the contacts to completely disconnect or become "loosely connected," causing frequent charging interruptions and affecting charging efficiency. It will also accelerate contact oxidation, aging of plastic components, and even melting of the insulation layer, leading to safety hazards. Utility Model Content

[0003] The main purpose of this utility model is to provide an earphone case, Bluetooth earphones and wireless communication device, which aims to solve the technical problem that dirt affects the charging efficiency of TWS earphones in the prior art.

[0004] To achieve the above objectives, this utility model proposes an earphone case, comprising:

[0005] Charging management chip, microcontroller, and charging pins;

[0006] The charging management chip connects to the Bluetooth headset via a charging pin, and the charging management chip also connects to the microcontroller.

[0007] The charging management chip is used to receive the charging current transmitted by the charging pins and transmit the charging current to the microcontroller.

[0008] The microcontroller is used to generate a boost switching signal and transmit it to the charging management chip when the amplitude of the received charging current is lower than the amplitude of the light load current.

[0009] The charging management chip is also used to boost the charging voltage to obtain the target charging voltage when a boost switching signal is received, and then transmit the target charging voltage to the Bluetooth headset for charging through the charging pin.

[0010] In addition, to achieve the above objectives, this utility model also proposes a Bluetooth headset, which includes: charging contacts, a power management chip, and a headset battery;

[0011] The power management chip is connected to the earphone case as described above via charging contacts, and the power management chip is also connected to the earphone battery.

[0012] The power management chip is used to receive the target charging voltage transmitted from the charging contacts and use the target charging voltage to charge the earphone battery.

[0013] In addition, to achieve the above objectives, this utility model also proposes a wireless communication device, which includes: the earphone case and Bluetooth earphone as described above. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the headphone case in the first embodiment of the present invention;

[0017] Figure 2 This is a circuit connection diagram of the earphone box in the second embodiment of this utility model;

[0018] Figure 3 This is a schematic diagram of the Bluetooth headset in the third embodiment of the present invention;

[0019] Figure 4 This is a circuit connection diagram of the Bluetooth headset in the third embodiment of this utility model;

[0020] Figure 5 This is a schematic diagram of the logic for detecting dirt in the earphone in the third embodiment of this utility model.

[0021] Explanation of reference numerals in the attached diagram: 1. Earphone case; 2. Bluetooth earphone; 10. Charging management chip; 20. Microcontroller; 30. Charging pin; 40. Charging contact; 50. Power management chip; 60. Earphone battery.

[0022] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0027] Based on this, the present invention provides an earphone case, as shown in the following embodiment. Figure 1 , Figure 1 This is a schematic diagram of the headphone case in the first embodiment of this utility model.

[0028] In this embodiment, the earphone case 1 includes a charging management chip 10, a microcontroller 20, and a charging pin 30. The charging management chip 10 is connected to the Bluetooth earphone 2 via the charging pin 30, and the charging management chip 10 is also connected to the microcontroller 20.

[0029] It should be noted that the charging management chip 10 can be used to receive the charging current transmitted by the charging pin 30 and transmit the charging current to the microcontroller 20. The microcontroller 20 can be used to generate a boost switching signal and transmit it to the charging management chip 10 when the amplitude of the received charging current is lower than the amplitude of the light load current. The charging management chip 10 can also be used to boost the charging voltage to obtain a target charging voltage when it receives the boost switching signal, and transmit the target charging voltage to the Bluetooth headset 2 for charging through the charging pin 30.

[0030] It should be understood that the charging management chip can be a functional chip located inside the earphone case that monitors and controls the current and voltage during the charging process of the Bluetooth earphones. For example, the SY8809 chip can be used to control the power supply from the external power source and the internal battery to charge the Bluetooth earphones. The charging pins can refer to the conductive connectors on the earphone case that physically contact the charging contacts of the Bluetooth earphones, such as spring-loaded pins (pogo pins). The power supplied by the earphone case can be transmitted to the Bluetooth earphones through the charging pins. The microcontroller unit (MCU) can be a miniature functional chip with data acquisition, processing, and signal transmission functions. It has an internal processor and memory, and can process the acquired data information according to the preset software program stored in the memory, generate corresponding processing results, and transmit them. The microcontroller can receive signals transmitted by the charging management chip and generate control commands based on signal analysis.

[0031] Furthermore, the charging current can be the current flowing from the earphone case to the Bluetooth earphone through the charging pins during the Bluetooth earphone charging process. Its amplitude change reflects the charging status, indicating normal charging, light load, and dirt conditions. The light load current can be a pre-set threshold current representing the Bluetooth earphone's condition when it is not dirty. When the charging current amplitude is equal to or slightly greater than the light load current amplitude, it indicates that the Bluetooth earphone is charging normally. When the charging current amplitude is less than the light load current amplitude, it indicates that the charging link between the earphone case and the Bluetooth earphone is dirty, interfering with the link impedance. The microcontroller can judge the amplitude of the charging current collected by the charging management chip. This judgment can be implemented using hardware circuitry or software programs. For example, it can be implemented using a comparator circuit built with an operational amplifier, or by using analog-to-digital conversion to convert the analog signal of the charging current into a digital signal and comparing it with a preset digital signal of the light load current amplitude through software. This embodiment does not impose specific limitations. When the microcontroller determines that the amplitude of the charging current exceeds the amplitude of the light-load current, it generates a boost switching signal, instructing the charging management chip to switch the charging voltage transmitted to the Bluetooth headset to a target charging voltage with a higher amplitude. This ensures the headset receives a higher charging voltage while maintaining the overall number of charging cycles, thereby improving contact impedance tolerance.

[0032] In one possible implementation, the earphone battery is fully charged at 4.4V. By measuring the impedance of the normal charging link, the formula Vbox_boost = Vear_bat + Iear_max × Rpath_max is used, where Vbox_boost is the charging voltage supplied by the earphone case to the Bluetooth earphone, Vear_bat is the earphone battery voltage, Iear_max is the charging current, and Rpath_max is the link impedance. The impedance from the output point of the earphone case's charging voltage to the input point of the Bluetooth earphone's charging voltage is measured using a four-wire method. Adding this to the internal impedance of the device, it can be calculated that the earphones can be fully charged when the charging voltage supplied by the earphone case to the Bluetooth earphone is set to 4.8V. When the earphone case detects a load and the charging current is less than the light load current, it indicates a contamination condition. The charging management chip can boost the charging voltage to obtain a target charging voltage of 5.2V. This achieves an impedance tolerance of 0.4V ÷ 0.16A = 2.5Ω. The above values ​​are for illustrative purposes only and do not represent specific charging voltage settings. During production, the voltage amplitude needs to be adjusted according to the device's physical structure and requirements.

[0033] This embodiment provides an earphone case, which includes a charging management chip, a microcontroller, and a charging pin. The charging management chip is connected to the Bluetooth earphone via the charging pin and is also connected to the microcontroller. The charging management chip receives the charging current transmitted by the charging pin and transmits the charging current to the microcontroller. The microcontroller generates a boost switching signal and transmits it to the charging management chip when the amplitude of the received charging current is lower than the amplitude of the light load current. The charging management chip also boosts the charging voltage upon receiving the boost switching signal to obtain a target charging voltage and transmits the target charging voltage to the Bluetooth earphone via the charging pin for charging. By detecting the charging current and comparing it with the light load current, a higher impedance tolerance is obtained by increasing the charging voltage output, avoiding contamination of the link that could affect the charging efficiency of TWS earphones.

[0034] Based on the first embodiment of this utility model, in the second embodiment of this utility model, the contents that are the same as or similar to those in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 2 , Figure 2 This is a circuit connection diagram of the earphone box in the second embodiment of this utility model.

[0035] In this embodiment, the charging management chip 10 includes: a current sampling pin (xSense), a voltage output pin (VOL, VOR), and a first communication pin (SCL, SDA); the voltage output pin is connected to the Bluetooth headset 2 through the charging pin 30, the first communication pin is connected to the microcontroller 20, and the current sampling pin is connected to the charging pin 30 and the first capacitor U1.

[0036] It should be noted that the charging management chip 10 can be used to acquire the charging current through the current sampling pin and transmit the charging current to the microcontroller 20 through the first communication pin. The charging management chip 10 can also be used to receive the boost switching signal through the first communication pin and transmit the target charging voltage to the Bluetooth headset 2 for charging through the charging pin 30 via the voltage output pin.

[0037] It should be understood that, since the earphone case needs to power both Bluetooth earphones simultaneously, it contains two voltage output pins to power the left and right earphones respectively.

[0038] Furthermore, the charging management chip also includes: a first voltage input pin (VIN), a first battery connection pin (BAT), and a system power supply pin (VSYS). The first voltage input pin is connected to an external input power supply (Vss), the first battery connection pin is connected to the built-in battery (B1) of the earphone case 1, and the system power supply pin is connected to the electrical load (Load) inside the earphone case 1.

[0039] It should be noted that the external power input can be a power source outside the headphone case (such as a power input via a USB interface), providing initial power to the charging management chip and the headphone case system through the first voltage input pin. The built-in battery of the headphone case can be a battery component inside the headphone case used to store electrical energy, connected to the charging management chip through the first battery connection pin. The charging management chip charges the built-in battery of the headphone case when there is an external power input, and the built-in battery of the headphone case can also power the system when there is no external power input. The electrical loads inside the headphone case can include components inside the headphone case that require power to operate (such as microcontrollers, indicator lights, communication modules, etc.).

[0040] In one possible implementation, the charging management chip can also be used to acquire the magnitude of the charging current as 0 when the target charging voltage is output, generate a dirt fault signal and transmit it to the microcontroller.

[0041] It should be understood that when the impedance is greater than a certain threshold (e.g., 41KΩ), the data establishment time between the earphone case and the Bluetooth earphone is insufficient, so the information transmitted from the earphone case to the Bluetooth earphone will be parsed incorrectly, causing the earphone to be unable to obtain the correct information sent by the case. Therefore, when the earphone case detects that the lid is closed and there is a load, the charging management chip will continuously output charging voltage. However, at this time, the charging current collected by the charging management chip is 0, and the communication between the earphone case and the Bluetooth earphone fails. This state lasts for a total of 30 minutes (if the lid is opened in the middle, the current is not 0mA, and the communication is established, the timer is reset and the timing is re-evaluated to determine whether it needs to be timed again). Then, a dirt fault signal is generated and transmitted to the microcontroller. Only after the earphone case and the Bluetooth earphone communicate successfully again will the earphone case inform the Bluetooth earphone that a dirt condition has occurred (when transmitting this fault information, it is necessary to determine whether the earphone has successfully received it). After the fault transmission is successful, the earphone case clears the fault record. The Bluetooth earphone receives the fault transmission information from the earphone case and will inform the earphone case whether it has successfully received it. After the user connects to Bluetooth, it will report the impedance greater than 41KΩ fault and the number of fault occurrences. After the reporting is completed, the corresponding fault information (including the trigger flag and the number of triggers) is cleared.

[0042] In this embodiment, the charging management chip samples the current and boosts the charging voltage output to the Bluetooth headset to achieve higher impedance tolerance. Furthermore, by detecting the charging current, it determines whether a large impedance has caused a charging failure, and notifies the user of the fault via the Bluetooth headset, preventing safety hazards and enabling timely troubleshooting to extend the product's lifespan.

[0043] Based on the first and / or second embodiments of this utility model, in the third embodiment of this utility model, the contents that are the same as or similar to those in the above embodiments can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 3 , Figure 3 This is a schematic diagram of the Bluetooth headset in the third embodiment of the present invention.

[0044] In this embodiment, the Bluetooth headset 2 includes a charging contact 40, a power management chip 50, and a headset battery 60. The power management chip 50 is connected to the headset case 1 via the charging contact 40, and the power management chip 50 is also connected to the headset battery 60.

[0045] It should be noted that the power management chip can be used to receive the target charging voltage transmitted by the charging contacts and use the target charging voltage to charge the earphone battery.

[0046] It should be understood that the power management chip can be a functional chip located inside the Bluetooth headset that manages the headset battery charging process, such as the SY5501 chip. The charging contacts can be conductive components on the Bluetooth headset used for physical contact with the charging pins of the charging case. The headset battery refers to the energy storage component built into the Bluetooth headset, providing it with operating power.

[0047] Reference Figure 4 , Figure 4 This is a circuit connection diagram of the Bluetooth headset in the third embodiment of this utility model. The power management chip 50 includes a second voltage input pin (VIN2) and a second battery connection pin (BAT2). The second voltage input pin is connected to the charging contact 40, and the second battery connection pin is connected to the headset battery 60.

[0048] The power management chip can be used to charge the earphone battery using the target charging voltage when the voltage difference between the second voltage input pin and the second battery connection pin exceeds the start-up charging voltage difference.

[0049] It should be noted that the headphones use a stepped current increase method when charging with high current. The charging start condition of the SY5501 is that the second voltage input pin (VIN2) is adjusted from low to high. The hysteresis voltage difference between the second voltage input pin (VIN2) and the second battery connection pin (BAT2) is designed to be 0.2V, and the actual value can be 0.26V. The charging stop condition of the SY5501 is that the second voltage input pin (VIN2) is adjusted from high to low. The hysteresis voltage difference between the second voltage input pin (VIN2) and the second battery connection pin (BAT2) is designed to be 0.07V, and the measured value can be 0.11V. Reducing the voltage difference when starting high current charging does not meet the charging start condition of the headphones. Therefore, when switching to high current charging, the headphones use a stepped current increase method from 1C & 100ms to 2C & 100ms to 3C.

[0050] It should be understood that 1C, 2C, and 3C refer to the charging rate (C-rate) of the headphones, describing the ratio of charging current to battery capacity, and can be used as an indicator of charging speed. 1C represents a charging current equal to the battery capacity, 2C represents a charging current twice the battery capacity, and 3C represents a charging current three times the battery capacity. This avoids overheating or aging of the battery due to prolonged high-rate charging. Directly starting charging with a high 3C current would cause a significant voltage drop through the link impedance, resulting in a hysteresis voltage difference between the second voltage input pin (VIN2) and the second battery connection pin (BAT2) falling below the charging threshold, preventing the SY5501 from initiating charging. By using a "slow current ramp-up," instantaneous voltage fluctuations are avoided, ensuring that the SY5501 consistently meets the charging start / stop voltage difference requirements throughout the charging process. This achieves 3C high-current fast charging while reducing charging interruptions and hiccups caused by contact impedance and excessive instantaneous current, ensuring charging efficiency and reliability.

[0051] Furthermore, the power management chip 50 also includes a second communication pin (SDA2, SCL2), and the power management chip 50 is also connected to the microcontroller 20 through the second communication pin; the microcontroller 20 is also used to transmit the charging current to the power management chip 50.

[0052] It should be noted that the power management chip can also be used to collect the battery voltage of the earphone battery. When the battery voltage is lower than the charging voltage threshold and the charging current is lower than the abnormal current threshold, the target charging voltage is used to charge the earphone battery, switching from a high charging rate to a low charging rate.

[0053] It should be understood that the MCU communicates with the SY8809 and SY5501 via I2C pins SDA / SCL respectively. Since the headphones actively reduce their charging current at high and low temperatures, and the charging current depends on the device's power supply capacity, the dirt detection proposed in this solution is only applicable to charging scenarios where the headphone case at room temperature supplies Bluetooth headphones (stable headphone charging current scenarios).

[0054] In one possible implementation, when the earphones are charging with a 3C current, the contact impedance increases to approximately 3Ω. Even if the charging case has boosted the voltage to 5.2V, the earphones may still experience a situation where the charging voltage cannot maintain the 3C charging current, thus actively reducing the constant current (CC) charging current. Specifically, during the trickle charging phase, the earphone charging current is too small for dirt detection. During the constant voltage phase, since the constant voltage phase itself involves reducing current, impedance identification cannot be performed by recognizing the current decrease. The earphone case MCU can detect the charging current of the left and right earphones using the Xsense function of the SY8809, and then transmit the earphone charging current to the earphone MCU in real time via a heartbeat (note: the earphone charging current needs to be sampled 10 times and averaged, and abnormal scenarios such as communication issues between the case and the earphone should be disabled). The earphone MCU reads the SY5501 status register via I2C. When the SY5501 is in the CC phase and the battery voltage is ≤4.15V, if the earphones receive a charging current <90mA (abnormal current threshold), the SY8809 detects this and transmits it to the earphones via a heartbeat. The system assumes the headphones are dirty, causing a charging anomaly. Once the user connects via Bluetooth, a pop-up window appears and the charging anomaly record is cleared. Simultaneously, the headphones proactively switch to 1C charging (this switch only occurs after three consecutive current readings below 90mA) to improve contact impedance tolerance. After the headphones are removed from the case and the Bluetooth pop-up appears, 3C charging resumes. Therefore, an impedance tolerance of (5.2V - 4.4V) ÷ 0.05A = 16Ω can be obtained.

[0055] Furthermore, the power management chip can also be used to switch the charging rate of the headphone battery from high to low when the target charging voltage is used to charge the headphone battery to reach a charging time threshold and the battery voltage is lower than a voltage growth threshold.

[0056] It should be noted that when the contact impedance is in the range of (16Ω, 70Ω), the earphones can enter the charging state, but the SY5501 will exhibit continuous hiccups. In a scenario where the earphones are charged from a room-temperature charging case, they enter the charging state after being recognized as being placed in the case and the case is closed. If the continuous charging time exceeds 30 minutes (charging time threshold) but the earphone battery voltage cannot reach 4.18V (voltage increase threshold), where normal charging at a constant current of 106mA for 25 minutes can charge to 4.2V, then the trigger judgment is considered dirty. The earphones actively reduce the charging current to 1C, record the abnormal information, and report it to the cloud. After the earphones recognize the opening and closing of the case, full charge, being placed in and out of the case, and entering the power on / off and reset process, the accumulated time of this mechanism is cleared, and the judgment starts again.

[0057] Furthermore, the power management chip can also be used to receive the remaining battery power of the earphone case via the second communication pin, and when the remaining battery power exceeds the charging capacity and the battery voltage is lower than the charging voltage threshold, generate a dirt fault signal and transmit it to the microcontroller. (Refer to...) Figure 5 , Figure 5 This is a schematic diagram of the logic for detecting dirt in the earphone in the third embodiment of this utility model.

[0058] It should be noted that when the contact impedance is in the range of (70Ω, 41KΩ), the earphones can communicate normally but cannot enter the charging state (IIC reads the SY5501 status register). In the scenario of charging the earphones with the box at room temperature, the earphones are recognized as being placed in the box, the box is closed, the box battery level is greater than 10% (charging capacity), and the earphone voltage is >3.4V & <4.2V (charging voltage threshold). If the earphones are detected as unable to enter charging for a cumulative period of 20 minutes (software debouncing is required when detecting the charging status, for example: checking once per minute, each check takes more than x seconds); after the earphones recognize the opening and closing of the box, full charge, being placed in and out of the box, and entering the power on / off and reset process, the cumulative time of this mechanism is cleared and the judgment starts again.

[0059] It should be understood that the earphone battery voltage is determined using the real-time sampled battery voltage. Dirt detection is disabled when the earphone case is open, and it also needs to be disabled when the earphone enters production line mode or diagnostic mode. The earphone needs to wait for the next restart to enable the dirt detection function. When the earphone is not charging, the charging case needs to send 0xFF information to the earphone.

[0060] Furthermore, this embodiment of the invention also proposes a wireless communication device. The wireless communication device includes the earphone case and Bluetooth earphone as described above.

[0061] Since the electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0062] It should be noted that the above examples are only for understanding this utility model and do not constitute a limitation on the headphone box of this utility model. Any simple modifications based on this technical concept are within the protection scope of this utility model.

[0063] The above description is only a preferred embodiment of the present utility model and does not limit the scope of protection of the present utility model. All equivalent structural transformations made under the concept of the present utility model and based on the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. An earphone case, characterized in that, The earphone case includes: a charging management chip, a microcontroller, and charging pins; The charging management chip is connected to the Bluetooth headset via the charging pin, and is also connected to the microcontroller; The charging management chip is used to receive the charging current transmitted by the charging pin and transmit the charging current to the microcontroller. The microcontroller is configured to generate a boost switching signal and transmit it to the charging management chip when the amplitude of the received charging current is lower than the amplitude of the light load current. The charging management chip is also used to boost the charging voltage to obtain a target charging voltage when it receives the boost switching signal, and transmit the target charging voltage to the Bluetooth headset for charging through the charging pin.

2. The earphone case of claim 1, wherein, The charging management chip includes: a current sampling pin, a voltage output pin, and a first communication pin; The voltage output pin is connected to the Bluetooth headset via the charging pin, the first communication pin is connected to the microcontroller, and the current sampling pin is connected to the charging pin and the first capacitor. The charging management chip is used to collect the charging current through the current sampling pin and transmit the charging current to the microcontroller through the first communication pin. The charging management chip is also used to receive the boost switching signal through the first communication pin, and to transmit the target charging voltage to the Bluetooth headset for charging through the charging pin via the voltage output pin.

3. The earphone case of claim 2, wherein, The charging management chip further includes: a first voltage input pin, a first battery connection pin, and a system power supply pin; The first voltage input pin is connected to an external power supply, the first battery connection pin is connected to the built-in battery of the headphone case, and the system power supply pin is connected to the electrical load inside the headphone case.

4. The earphone case of claim 3, wherein, The charging management chip is also used to collect the charging current when the target charging voltage is output and the magnitude of the charging current is 0, generate a dirt fault signal and transmit it to the microcontroller.

5. A Bluetooth earpiece, characterized in that, The Bluetooth headset includes: charging contacts, a power management chip, and a headset battery; The power management chip is connected to the earphone case as described in any one of claims 1 to 4 via the charging contacts, and the power management chip is also connected to the earphone battery; The power management chip is used to receive the target charging voltage transmitted by the charging contacts and use the target charging voltage to charge the earphone battery.

6. The Bluetooth headset of claim 5, wherein, The power management chip includes: a second voltage input pin and a second battery connection pin; The second voltage input pin is connected to the charging contact, and the second battery connection pin is connected to the earphone battery; The power management chip is used to charge the earphone battery using the target charging voltage when the voltage difference between the second voltage input pin and the second battery connection pin exceeds the start-up charging voltage difference.

7. The Bluetooth headset of claim 6, wherein, The power management chip also includes: a second communication pin; The power management chip is also connected to the microcontroller via a second communication pin; The microcontroller is also used to transmit the charging current to the power management chip; The power management chip is further configured to collect a battery voltage of the earphone battery, and switch the target charging voltage for charging the earphone battery from a high charging rate to a low charging rate when the battery voltage is lower than a charging voltage threshold and the charging current is lower than an abnormal current threshold.

8. The Bluetooth headset of claim 7, wherein, The power management chip is further configured to switch the target charging voltage for charging the earphone battery from a high charging rate to a low charging rate when a charging time threshold is reached in charging the earphone battery using the target charging voltage and the battery voltage is lower than a voltage growth threshold.

9. The Bluetooth headset of claim 7, wherein, The power management chip is further configured to receive a remaining power of an earphone box through the second communication pin, and generate a dirty fault signal and transmit the dirty fault signal to the microcontroller when the remaining power exceeds a charging power and the battery voltage is lower than the charging voltage threshold.

10. A wireless communication device, comprising: The wireless communication device comprises the earphone box according to any one of claims 1-4 and the Bluetooth earphone according to any one of claims 5-9.

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