Bluetooth earphone charging circuit and Bluetooth earphone

Abstract

The utility model relates to the technical field of Bluetooth earphones, and discloses a Bluetooth earphone charging circuit and a Bluetooth earphone, the Bluetooth earphone charging circuit comprises a Bluetooth chip, a charging module and a battery, the battery comprises a thermistor, the Bluetooth chip is respectively connected with the charging module and the battery, and the charging module is connected with the battery. The Bluetooth chip is used for detecting the battery temperature of the battery through the thermistor, when the battery temperature is in a first preset interval, the Bluetooth chip is used for applying first charging current to the battery, and the charging module stops charging the battery. When the battery temperature is in a second preset interval, the charging module is used for applying second charging current to the battery, the Bluetooth chip stops charging the battery, and the first charging current is smaller than the second charging current. The temperature of the battery is detected through the thermistor, and low-current charging or high-current charging is carried out when the temperature of the battery is in different temperature intervals. And the battery can be protected without a chip with temperature control, so that the cost of the Bluetooth earphone is reduced.

Description

Technical Field

[0001] This application relates to the field of Bluetooth headset technology, and more particularly to a Bluetooth headset charging circuit and a Bluetooth headset. Background Technology

[0002] Bluetooth headsets are earphones that utilize Bluetooth technology, freeing users from the constraints of wires. Bluetooth headsets are powered by a built-in battery, thus requiring charging. During charging, the charging current needs to be controlled based on the battery temperature to protect it. Current technologies employ dedicated charging chips with temperature control to detect battery temperature and adjust the charging current accordingly. However, these temperature-controlled chips require built-in temperature detection circuitry and complex algorithms to achieve precise current control based on battery temperature, resulting in higher costs for Bluetooth headsets. Therefore, reducing the cost of Bluetooth headsets while protecting the battery has become a pressing technical challenge. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a Bluetooth headset charging circuit and a Bluetooth headset that reduces the cost of the Bluetooth headset while protecting the battery.

[0004] In a first aspect, this application proposes a Bluetooth headset charging circuit, which includes a Bluetooth chip, a charging module, and a battery. The battery includes a thermistor. The Bluetooth chip is connected to both the charging module and the battery. The charging module is connected to the battery.

[0005] The Bluetooth chip is used to detect the battery temperature of the battery through the thermistor;

[0006] When the battery temperature is in a first preset range, the Bluetooth chip applies a first charging current to the battery, and the charging module stops charging the battery.

[0007] When the battery temperature is in the second preset range, the charging module applies a second charging current to the battery, and the Bluetooth chip stops charging the battery; wherein, the first charging current is less than the second charging current.

[0008] In some embodiments, when the battery temperature is less than a first preset threshold or greater than a second preset threshold, the Bluetooth chip and the charging module stop charging the battery; wherein, the first preset threshold is equal to the lower limit of the first preset range, and the second preset threshold is equal to the upper limit of the second preset range.

[0009] In some embodiments, the charging circuit further includes a charging interface, which is electrically connected to the Bluetooth chip and the charging module respectively.

[0010] In some embodiments, the charging module includes a charging chip, a first resistor, a second resistor, a third resistor, and a fourth resistor;

[0011] The first pin of the charging chip is grounded, the second pin of the charging chip is grounded through the first resistor, the third pin of the charging chip is connected to the first resistor and ground respectively, the fourth pin of the charging chip is connected to the charging interface, the fifth pin of the charging chip is connected to the battery, the seventh pin of the charging chip is connected to the Bluetooth chip through the second resistor, the eighth pin of the charging chip is connected to the Bluetooth chip through the third resistor, and the eighth pin of the charging chip is grounded through the fourth resistor.

[0012] In some embodiments, the charging circuit further includes a charging interface and an overvoltage and overcurrent protection circuit, wherein the charging interface is electrically connected to the overvoltage and overcurrent protection circuit, and the overvoltage and overcurrent protection circuit is electrically connected to the Bluetooth chip and the charging module, respectively.

[0013] In some embodiments, the overvoltage and overcurrent protection circuit is used to detect the input voltage and input current of the charging interface, and disconnect the connection between the charging interface and the Bluetooth chip, and disconnect the connection between the charging interface and the charging module when the input voltage is greater than a preset voltage and / or the input current is greater than a preset current.

[0014] In some embodiments, the charging module includes a charging chip, a first resistor, a second resistor, a third resistor, and a fourth resistor;

[0015] The first pin of the charging chip is grounded, the second pin of the charging chip is grounded through the first resistor, the third pin of the charging chip is connected to the first resistor and ground respectively, the fourth pin of the charging chip is connected to the overvoltage and overcurrent protection circuit, the fifth pin of the charging chip is connected to the battery, the seventh pin of the charging chip is connected to the Bluetooth chip through the second resistor, the eighth pin of the charging chip is connected to the Bluetooth chip through the third resistor, and the eighth pin of the charging chip is grounded through the fourth resistor.

[0016] In some embodiments, when the battery temperature is within the first preset range, the Bluetooth chip applies a first charging current to the battery and sends a first enable signal to the eighth pin of the charging chip, and the charging chip stops charging the battery according to the first enable signal;

[0017] When the battery temperature is within the second preset range, the Bluetooth chip stops charging the battery and sends a second enable signal to the eighth pin of the charging chip. The charging chip then applies a second charging current to the battery according to the second enable signal.

[0018] In some embodiments, the Bluetooth chip is a microcontroller unit with integrated Bluetooth communication function, and the charging chip in the charging module is a microcontroller unit with battery charging control function.

[0019] Secondly, embodiments of this application provide a Bluetooth headset, including the Bluetooth headset charging circuit described in the first aspect.

[0020] The Bluetooth headset charging circuit proposed in this application includes a Bluetooth chip, a charging module, and a battery. The battery includes a thermistor. The Bluetooth chip is connected to both the charging module and the battery, and the charging module is connected to the battery. The Bluetooth chip detects the battery temperature using the thermistor. When the battery temperature is within a first preset range, the Bluetooth chip applies a first charging current to the battery, and the charging module stops charging the battery. When the battery temperature is within a second preset range, the charging module applies a second charging current to the battery, and the Bluetooth chip stops charging the battery. The first charging current is less than the second charging current. By detecting the battery temperature using the thermistor and applying either a small or large current when the battery temperature is within different temperature ranges, battery protection is achieved without the need for a temperature-controlled chip, reducing the cost of the Bluetooth headset.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic diagram of the Bluetooth headset charging circuit provided in the first embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the Bluetooth headset charging circuit provided in the second embodiment of this application;

[0025] Figure 3 This is a circuit connection diagram of the charging module provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of a Bluetooth headset charging circuit provided in the second embodiment of this application. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0031] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] During the charging process of Bluetooth headsets, the charging current needs to be controlled based on the battery temperature to protect the battery. Related technologies employ dedicated charging chips with temperature control to detect the battery temperature and adjust the charging current accordingly. However, these temperature-controlled charging chips require built-in temperature detection circuitry and complex algorithms to achieve precise control of the charging current based on battery temperature, resulting in higher costs for Bluetooth headsets.

[0033] Based on this, this application provides a Bluetooth headset charging circuit, which is applied to a Bluetooth headset, and is described in detail through the following embodiments.

[0034] Figure 1 This is a schematic diagram of the Bluetooth headset charging circuit provided in the first embodiment of this application, as shown below. Figure 1 As shown, the Bluetooth headset charging circuit provided in this application embodiment includes a Bluetooth chip 10, a charging module 11, and a battery 12. The battery 12 includes a thermistor 121. The Bluetooth chip 10 is connected to the charging module 11 and the battery 12, respectively. The charging module 11 is connected to the battery 12.

[0035] The Bluetooth chip 10 is used to detect the battery temperature of the battery 12 via the thermistor 121. The resistance of the thermistor 121 changes with temperature; as the temperature rises, the resistance decreases, and the voltage across the thermistor 121 changes accordingly. After detecting the voltage value of the thermistor 121, the Bluetooth chip 10 converts the voltage value into a temperature value using a temperature characteristic curve or a lookup table, thereby enabling the detection of the battery temperature.

[0036] It should be noted that when the battery temperature is within [0℃, 10℃), the chemical reaction rate of battery 12 decreases, and the charging efficiency also decreases. Within this temperature range, the charging current needs to be limited to a low level to prevent the internal pressure of battery 12 from increasing and crystallization from occurring inside battery 12; therefore, low-current charging is required. When the battery temperature is within [10℃, 45℃], the chemical reaction inside battery 12 is normal and stable, and the charging efficiency is highest, allowing for high-current charging. Therefore, the first preset range can be [0℃, 10℃), and the second preset range can be [10℃, 45℃].

[0037] Specifically, when the battery temperature is within the range of [0℃, 10℃), the Bluetooth chip 10 applies a first charging current to the battery 12 and controls the charging module 11 to stop charging the battery 12. When the battery temperature is within a second preset range, the Bluetooth chip 10 controls the charging module 11 to apply a second charging current to the battery 12, and the Bluetooth chip 10 stops charging the battery 12; wherein, the first charging current is less than the second charging current. For example, the first charging current can be 0.2C, and the second charging current can be 2C (C refers to the total capacity of the battery 12).

[0038] The Bluetooth headset charging circuit proposed in this application includes a Bluetooth chip 10, a charging module 11, and a battery 12. The battery 12 includes a thermistor 121. The Bluetooth chip 10 is connected to both the charging module 11 and the battery 12, and the charging module 11 is connected to the battery 12. The Bluetooth chip 10 detects the battery temperature of the battery 12 through the thermistor 121. When the battery temperature is within a first preset range, the Bluetooth chip 10 applies a first charging current to the battery 12, and the charging module 11 stops charging the battery 12. When the battery temperature is within a second preset range, the charging module 11 applies a second charging current to the battery 12, and the Bluetooth chip 10 stops charging the battery 12. The first charging current is less than the second charging current. By detecting the battery temperature through the thermistor 121 and performing small-current or large-current charging when the battery temperature is within different temperature ranges, battery protection is achieved without the need for a temperature-controlled chip, reducing the cost of the Bluetooth headset.

[0039] In some embodiments, when the battery temperature is lower than a first preset threshold or higher than a second preset threshold, the Bluetooth chip 10 and the charging module 11 stop charging the battery 12. The first preset threshold is equal to the lower limit of a first preset range, and the second preset threshold is equal to the upper limit of a second preset range.

[0040] Specifically, when the first preset range is [0℃, 10℃], the first preset threshold is 0℃; when the second preset range is [10℃, 45℃], the second preset threshold is 45℃. When the battery temperature is below 0℃, the chemical reaction inside the battery 12 is inhibited, causing the battery 12 to fail to charge normally. When the battery temperature is above 45℃, the chemical reaction inside the battery 12 intensifies, causing the battery 12 to overheat, affecting its lifespan or causing safety issues. Therefore, when the battery temperature is below 0℃ or above 45℃, both the Bluetooth chip 10 and the charging module 11 stop charging the battery 12.

[0041] In some embodiments, such as Figure 2 As shown, the charging circuit also includes a charging interface 20, which is electrically connected to both the Bluetooth chip 10 and the charging module 11. In one example, the charging interface 20 can be a USB interface. During charging, the power supply and the USB interface are connected via USB to provide power to the Bluetooth headset. After the current enters through the USB interface, it is split into two paths, one to the Bluetooth chip 10 and the other to the charging module 11, enabling either the Bluetooth chip 10 or the charging module 11 to charge the battery 12.

[0042] In some embodiments, such as Figure 3 As shown, the charging module 11 includes a charging chip U2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4.

[0043] The first pin of the charging chip U2 is grounded, the second pin of the charging chip U2 is grounded through the first resistor R1, the third pin of the charging chip U2 is connected to the first resistor R1 and ground respectively, the fourth pin of the charging chip U2 is connected to the charging interface 20 (USB_VBUS), the fifth pin of the charging chip U2 is connected to the battery 12 (VBAT), the seventh pin of the charging chip U2 is connected to the Bluetooth chip 10 (CHG_STAT) through the second resistor R2, the eighth pin of the charging chip U2 is connected to the Bluetooth chip 10 (CHG_EN) through the third resistor R3, and the eighth pin of the charging chip U2 is also grounded through the fourth resistor R4.

[0044] Specifically, the current flows into the fourth pin of the charging chip U2 through the charging interface 20, and then into the battery 12 through the fifth pin of the charging chip U2, thereby charging the battery 12.

[0045] In order to prevent the voltage input to the charging interface 20 from exceeding the maximum rated voltage that the Bluetooth chip 10 or the charging module 11 can withstand, and to prevent the current input to the charging interface 20 from exceeding the maximum rated current that the Bluetooth chip 10 or the charging module 11 can withstand, overvoltage and overcurrent protection needs to be provided between the charging interface 20 and the Bluetooth chip 10, and between the charging interface 20 and the charging module 11.

[0046] Therefore, in some embodiments, such as Figure 4 As shown, the charging circuit also includes a charging interface 20 and an overvoltage and overcurrent protection circuit 40. The charging interface 20 is electrically connected to the overvoltage and overcurrent protection circuit 40, and the overvoltage and overcurrent protection circuit 40 is electrically connected to the Bluetooth chip 10 and the charging module 11, respectively.

[0047] Specifically, the overvoltage and overcurrent protection circuit 40 is used to detect the input voltage and input current of the charging interface 20. When the input voltage exceeds the preset voltage (maximum rated voltage) and / or the input current exceeds the preset current (maximum rated current), it disconnects the connection between the charging interface 20 and the Bluetooth chip 10, as well as the connection between the charging interface 20 and the charging module 11. This prevents excessive voltage or current from burning out the Bluetooth chip 10 and the charging chip U2.

[0048] In some embodiments, when the charging circuit includes an overvoltage and overcurrent protection circuit 40, please refer to [link / reference needed]. Figure 3The first pin of the charging chip U2 is grounded, the second pin of the charging chip U2 is grounded through the first resistor R1, the third pin of the charging chip U2 is connected to the first resistor R1 and ground respectively, the fourth pin of the charging chip U2 is connected to the overvoltage and overcurrent protection circuit 40 (USB_VBUS), the fifth pin of the charging chip U2 is connected to the battery 12 (VBAT), the seventh pin of the charging chip U2 is connected to the Bluetooth chip 10 (CHG_STAT) through the second resistor R2, the eighth pin of the charging chip U2 is connected to the Bluetooth chip 10 (CHG_EN) through the third resistor R3, and the eighth pin of the charging chip U2 is also grounded through the fourth resistor R4.

[0049] Specifically, the current flows through the charging interface 20 into the overvoltage and overcurrent protection circuit 40, then into the fourth pin of the charging chip U2, and finally into the battery 12 through the fifth pin of the charging chip U2, thereby charging the battery 12.

[0050] In some embodiments, when the battery temperature is in a first preset range, the Bluetooth chip 10 applies a first charging current to the battery 12 and sends a first enable signal to the eighth pin of the charging chip U2. The charging chip U2 then stops charging the battery 12 according to the first enable signal. When the battery temperature is in a second preset range, the Bluetooth chip 10 stops charging the battery 12 and sends a second enable signal to the eighth pin of the charging chip U2. The charging chip U2 then applies a second charging current to the battery 12 according to the second enable signal.

[0051] Specifically, after detecting the battery temperature, the Bluetooth chip 10 determines whether low-current or high-current charging is needed based on the temperature range. If the battery temperature is within the first preset range, low-current charging is used, and a first enable signal is sent to the charging chip U2 to turn it off, stopping charging the battery 12. In this case, only the Bluetooth chip 10 provides low-current charging to the battery 12. If the battery temperature is within the second preset range, high-current charging is used, and a second enable signal is sent to the charging chip U2 to turn it on. In this case, only the charging chip U2 provides high-current charging to the battery 12.

[0052] In some embodiments, Bluetooth chip 10 is a microcontroller unit with integrated Bluetooth communication function, for example, Bluetooth chip 10 is model AB1585. Charging chip U2 is a microcontroller unit with battery charging control function, for example, charging chip U2 is model ETA40543E8A. Both AB1585 and ETA40543E8A are low-cost chips.

[0053] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A Bluetooth headset charging circuit, characterized in that, The Bluetooth headset charging circuit includes a Bluetooth chip, a charging module, and a battery. The battery includes a thermistor. The Bluetooth chip is connected to both the charging module and the battery. The charging module is connected to the battery. The Bluetooth chip is used to detect the battery temperature of the battery through the thermistor; When the battery temperature is in a first preset range, the Bluetooth chip applies a first charging current to the battery, and the charging module stops charging the battery. When the battery temperature is in the second preset range, the charging module applies a second charging current to the battery, and the Bluetooth chip stops charging the battery; wherein, the first charging current is less than the second charging current.

2. The Bluetooth headset charging circuit according to claim 1, characterized in that, When the battery temperature is less than a first preset threshold or greater than a second preset threshold, the Bluetooth chip and the charging module stop charging the battery; wherein, the first preset threshold is equal to the lower limit of the first preset range, and the second preset threshold is equal to the upper limit of the second preset range.

3. The Bluetooth headset charging circuit according to claim 1, characterized in that, The charging circuit also includes a charging interface, which is electrically connected to the Bluetooth chip and the charging module respectively.

4. The Bluetooth headset charging circuit according to claim 3, characterized in that, The charging module includes a charging chip, a first resistor, a second resistor, a third resistor, and a fourth resistor; The first pin of the charging chip is grounded, the second pin of the charging chip is grounded through the first resistor, the third pin of the charging chip is connected to the first resistor and ground respectively, the fourth pin of the charging chip is connected to the charging interface, the fifth pin of the charging chip is connected to the battery, the seventh pin of the charging chip is connected to the Bluetooth chip through the second resistor, the eighth pin of the charging chip is connected to the Bluetooth chip through the third resistor, and the eighth pin of the charging chip is grounded through the fourth resistor.

5. The Bluetooth headset charging circuit according to claim 1, characterized in that, The charging circuit also includes a charging interface and an overvoltage and overcurrent protection circuit. The charging interface is electrically connected to the overvoltage and overcurrent protection circuit, and the overvoltage and overcurrent protection circuit is electrically connected to the Bluetooth chip and the charging module, respectively.

6. The Bluetooth headset charging circuit according to claim 5, characterized in that, The overvoltage and overcurrent protection circuit is used to detect the input voltage and input current of the charging interface. When the input voltage is greater than a preset voltage and / or the input current is greater than a preset current, the circuit disconnects the connection between the charging interface and the Bluetooth chip, and disconnects the connection between the charging interface and the charging module.

7. The Bluetooth headset charging circuit according to claim 5, characterized in that, The charging module includes a charging chip, a first resistor, a second resistor, a third resistor, and a fourth resistor; The first pin of the charging chip is grounded, the second pin of the charging chip is grounded through the first resistor, the third pin of the charging chip is connected to the first resistor and ground respectively, the fourth pin of the charging chip is connected to the overvoltage and overcurrent protection circuit, the fifth pin of the charging chip is connected to the battery, the seventh pin of the charging chip is connected to the Bluetooth chip through the second resistor, the eighth pin of the charging chip is connected to the Bluetooth chip through the third resistor, and the eighth pin of the charging chip is grounded through the fourth resistor.

8. The Bluetooth headset charging circuit according to claim 4 or 7, characterized in that, When the battery temperature is within the first preset range, the Bluetooth chip applies a first charging current to the battery and sends a first enable signal to the eighth pin of the charging chip. The charging chip then stops charging the battery according to the first enable signal. When the battery temperature is within the second preset range, the Bluetooth chip stops charging the battery and sends a second enable signal to the eighth pin of the charging chip. The charging chip then applies a second charging current to the battery according to the second enable signal.

9. The Bluetooth headset charging circuit according to claim 1, characterized in that, The Bluetooth chip is a microcontroller unit with integrated Bluetooth communication function, and the charging chip in the charging module is a microcontroller unit with battery charging control function.

10. A Bluetooth headset, characterized in that, Includes the Bluetooth headset charging circuit as described in any one of claims 1 to 9.

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