Earphone charging box and charging control circuit thereof

Abstract

The utility model relates to the technical field of earphone charging, and relates to an earphone charging box and a charging control circuit thereof. The circuit comprises a battery, an interface module, a power management chip, a power switching module and a boost module, the battery is connected with the power management chip and a first voltage input end of the power switching module, and the interface module is connected with a voltage input end of the power management chip and a second voltage input end of the power switching module. The voltage output end of the power switching module is connected with the voltage input end of the boosting module, the power management chip is connected with the enabling end of the boosting module, the voltage output end of the boosting module is used for being connected with the charging end of an external earphone, and the power management chip is used for detecting a first voltage value of the battery and a second voltage value input by the interface module. The first voltage value and the second voltage value are compared with corresponding preset values and then a first level signal is output to the boosting module, and the boosting module carries out boosting output or stops boosting output. According to the invention, the endurance time of the earphone charging box can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to earphone charging technical field, especially earphone charging box and charging control circuit thereof. BACKGROUND

[0002] Wireless earphone is favored by people because it does not need connecting line and is convenient to carry and wear. Wireless earphone needs to be charged by the earphone charging box equipped.

[0003] Generally, the earphone charging box is built-in battery, which can charge the earphone placed in the earphone charging box. In the existing earphone charging box, when the battery is in the low voltage interval, it still boosts output to charge the earphone, and the battery power will be quickly consumed by the earphone. Often, the earphone has power, but the earphone charging box has no power. When the earphone needs to use the earphone charging box to output communication signal to trigger the earphone communication start, the earphone cannot be used because the earphone charging box has no power, the earphone charging box has short endurance time, and the user experience is poor. SUMMARY

[0004] The technical problem to be solved by the embodiment of the utility model is to provide an earphone charging box and a charging control circuit thereof to solve the problem of short endurance time of the earphone charging box and poor user experience in the prior art.

[0005] The utility model discloses an earphone charging box's charging control circuit, including battery, interface module, power management chip, power switch module and boost module, the battery connects the first voltage input end of power management chip and power switch module, interface module connects the voltage input end of power management chip and the second voltage input end of power switch module, the voltage output end of power switch module connects the voltage input end of boost module, power management chip connects the enable end of boost module, the voltage output end of boost module is used for connecting the charging end of external earphone, wherein,

[0006] The power management chip is used for detecting the first voltage value of the battery and the second voltage value input by the interface module, and outputs the first voltage value and the second voltage value to the boost module after comparing the first voltage value and the second voltage value with the corresponding preset value respectively, and the boost module performs boost output or stop boost output based on the first level signal.

[0007] Optionally, the power switch module includes a PMOS tube and a diode, the gate of the PMOS tube is connected with the interface module, the ground terminal and the anode of the diode, the drain is connected with the battery, the source is connected with the voltage input end of the boost module and the cathode of the diode, and the anode of the diode is connected with the interface module.

[0008] Optionally, the voltage boosting module comprises a voltage boosting management chip, an energy storage inductor and an energy storage capacitor, a switch end of the voltage boosting management chip is connected to a first end of the energy storage inductor, a voltage input end of the voltage boosting management chip is connected to one end of the energy storage capacitor, a source of the PMOS tube, a second end of the energy storage inductor and a negative electrode of the diode, a voltage output end of the voltage boosting management chip is used to connect a charging end of an external earphone, and an enable end is connected to the power management chip.

[0009] Optionally, the voltage boosting module further comprises a filtering unit, which is arranged between the voltage output end of the voltage boosting management chip and the charging end of the external earphone.

[0010] Optionally, the filtering unit comprises a first filtering capacitor and a second filtering capacitor, the first filtering capacitor and the second filtering capacitor are connected in parallel, a first parallel node of the first filtering capacitor and the second filtering capacitor is connected to the voltage output end of the voltage boosting management chip and the charging end of the external earphone, and a second parallel node is grounded.

[0011] Optionally, the charging control circuit further comprises an overload protection module, a voltage input end of the overload protection module is connected to the interface module, and a voltage output end of the overload protection module is connected to a second voltage input end of the power switching module and a voltage input end of the power management chip.

[0012] Optionally, the overload protection module comprises an overload protection chip, a resistor and a third filtering capacitor, the resistor and the third filtering capacitor are connected in series, the other end of the resistor is connected to the interface module and a voltage input end of the overload protection chip, the other end of the third filtering capacitor is grounded, and a voltage output end of the overload protection chip is connected to the second voltage input end of the power switching module and the voltage input end of the power management chip.

[0013] Optionally, the charging control circuit further comprises a Hall switch for sensing a magnetic field change and outputting a switch cover signal, the Hall switch is connected to the power management chip, the switch cover signal is transmitted to the power management chip, the power management chip outputs a second level signal to an enable pin of the voltage boosting module based on the switch cover signal, and the voltage boosting module outputs a level communication signal based on the second level signal.

[0014] Optionally, the interface module comprises one or more of a type-C interface, a USB-A interface and a lighting interface, and the type-C interface, the USB-A interface and the lighting interface are all connected to the voltage input end of the power management chip and the second voltage input end of the power switching module.

[0015] The utility model discloses still earphone charging box's charging control circuit, its characterized in that, including casing, circuit board and earphone charging box's charging control circuit as above-mentioned, charging control circuit is located on the circuit board, the circuit board is located in the casing, the casing is provided with the storage bin for placing earphone.

[0016] Compared with the prior art, the earphone charging box charging control circuit has the beneficial effects that: the earphone charging box charging control circuit is provided with a battery, an interface module, a power management chip, a power switching module and a voltage boosting module. The battery and the interface module are respectively connected to the first voltage input end and the second voltage input end of the power switching module. In the case of inputting charging voltage by the interface module, the power switching module switches to input the charging voltage of the interface module as the power supply of the voltage boosting module. The voltage boosting module performs voltage boosting output under the enablement of the first level signal, reduces battery power consumption, or in the case of no voltage input by the interface module, the power management chip detects the first voltage value of the battery, compares the first voltage value with the corresponding preset value, and outputs the first level signal to the voltage boosting module. The voltage boosting module performs voltage boosting output or stops voltage boosting output under the enablement of the first level signal, so as to stop the battery from charging the earphone when the battery is in the low voltage interval, improve the endurance time of the earphone charging box, and improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0017] The technical solutions of the utility model will be further described in detail below with reference to the drawings and embodiments. In the drawings:

[0018] Figure 1 is the module schematic diagram of the earphone charging box charging control circuit embodiment provided by the utility model embodiment;

[0019] Figure 2 is the module schematic diagram of the earphone charging box charging control circuit another embodiment provided by the utility model embodiment;

[0020] Figure 3 is the partial circuit schematic diagram of the power management chip provided by the utility model embodiment;

[0021] Figure 4 is the partial circuit schematic diagram of the power switching module and the voltage boosting module connection provided by the utility model embodiment;

[0022] Figure 5 is the partial circuit schematic diagram of the overload protection module provided by the utility model embodiment;

[0023] Figure 6 is the partial circuit schematic diagram of the interface module provided by the utility model embodiment.

[0024] The reference signs in the drawings are:

[0025] 10, battery; 20, interface module; 30(U1), power management chip; 40, power switching module; 50, boost module; 60, overload protection module; 70, Hall switch;

[0026] Q1, PMOS tube; D1, diode; U2, boost management chip; L1, energy storage inductor; C1, energy storage capacitor; C2, first filter capacitor; C3, second filter capacitor; C4, third filter capacitor; U3, load protection chip; R1, resistor; J1, type-C interface. DETAILED DESCRIPTION

[0027] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. Now, the preferred embodiments of the present application will be described in detail with reference to the drawings.

[0028] The charging control circuit of the earphone charging box provided in the embodiments of the present application can realize control of earphone charging.

[0029] As Figure 1 shown, the charging control circuit of the earphone charging box includes a battery 10, an interface module 20, a power management chip 30(U1), a power switching module 40, and a boost module 50. The battery 10 is connected to a first voltage input end of the power management chip 30(U1) and the power switching module 40. The interface module 20 is connected to a voltage input end of the power management chip 30(U1) and a second voltage input end of the power switching module 40. A voltage output end of the power switching module 40 is connected to a voltage input end of the boost module 50. The power management chip 30(U1) is connected to an enable end EN of the boost module 50. A voltage output end of the boost module 50 is used to connect to a charging end of an external earphone.

[0030] The power management chip 30(U1) is used to detect a first voltage value of the battery 10 and a second voltage value input by the interface module 20. After comparing the first voltage value and the second voltage value with corresponding preset values, respectively, a first level signal is output to the boost module 50. The boost module 50 performs boost output or stops boost output based on the first level signal.

[0031] The charging control circuit of the earphone charging box of the embodiment of the application is configured by the battery 10, the interface module 20, the power management chip 30 (U1), the power switching module 40 and the voltage boosting module 50. The battery 10 and the interface module 20 are respectively connected to the first voltage input end and the second voltage input end of the power switching module 40. In the case that the interface module 20 inputs the charging voltage, the power switching module 40 is switched to input the charging voltage input by the interface module 20 as the power supply of the voltage boosting module 50. The voltage boosting module 50 performs voltage boosting output under the enablement of the first level signal, thereby reducing the power consumption of the battery 10. Or in the case that the interface module 20 does not input the voltage, the power management chip 30 (U1) detects the first voltage value of the battery 10, compares the first voltage value with the corresponding preset value, and then outputs the first level signal to the voltage boosting module 50. The voltage boosting module 50 performs voltage boosting output or stops voltage boosting output under the enablement of the first level signal, thereby stopping the battery 10 from charging the earphone when the battery 10 is in the low voltage interval, improving the endurance time of the earphone charging box and improving the user experience.

[0032] The second voltage value input by the interface module 20 is detected, that is, whether the interface module 20 inputs the charging voltage. In the case that the interface module 20 inputs the charging voltage, the power management module directly outputs the high level signal to enable the voltage boosting module 50 to perform voltage boosting output. In the case that the interface module 20 does not input the charging voltage, the power management module outputs the level signal based on the comparison result of the first voltage value of the battery 10 and the corresponding preset value.

[0033] The power management chip 30 (U1) is internally integrated with a voltage detection circuit, a multi-stage comparator circuit, a charging circuit and the like. The voltage detection circuit can realize the voltage detection of the battery 10 and the detection of the voltage input by the interface module 20. The multi-stage comparator circuit can realize the comparison of the first voltage value of the battery 10 with the corresponding preset value and the comparison of the second voltage value input by the interface module 20 with the corresponding preset value. Based on the two results, the first level signal, that is, the high level signal or the low level signal, is output. The high level signal can enable the voltage boosting module 50 to perform voltage boosting output, and the low level signal can enable the voltage boosting module 50 to stop voltage boosting output. For example, the power management chip 30 (U1) can be a chip with a model number of SS881A, SS880A, SS81E or the like.

[0034] When the first voltage value of the battery 10 is less than the corresponding preset value, it indicates that the battery 10 is in the low voltage interval, and the corresponding preset value of the first voltage value can be set according to the specifications of the battery 10, for example, the standard voltage of the battery 10 is 4.2, and the corresponding preset value can be set to 3.45V or other values, which can be set by the designer according to the needs. When the second voltage value input by the interface module 20 is less than the corresponding preset value, it indicates that the interface module 20 has no charging voltage input, and when the second voltage value input by the interface module 20 is greater than or equal to the corresponding preset value, it indicates that the interface module 20 has charging voltage input. The corresponding preset value of the second voltage value can be set according to the actual needs.

[0035] In an optional embodiment of the present application, referring to Figure 4 The power switching module 40 includes a PMOS tube Q1 and a diode D1, the gate of the PMOS tube Q1 is connected to the interface module 20, the ground end and the anode of the diode D1, the drain is connected to the battery 10, the source is connected to the voltage input end of the boost module 50 and the cathode of the diode D1, and the anode of the diode D1 is connected to the interface module 20. Figure 4 In the figure, BAT+ is marked as the battery 10.

[0036] By setting the PMOS tube Q1 and the diode D1, the drain of the PMOS tube Q1 is used as the first voltage input end of the power switching module 40, and the gate is used as the second voltage input end of the power switching module 40, so as to realize the power supply path of the boost module 50, and the circuit structure is simple, which is conducive to the miniaturization of the overall circuit and the earphone charging box. Specifically, in the case that the interface module 20 has charging voltage input, the gate of the PMOS tube Q1 is pulled high to high level, the PMOS tube Q1 is cut off, the path between the battery 10 and the voltage input end of the boost management chip U2 is disconnected, the charging of the earphone is stopped, the power consumption of the battery 10 is reduced, the earphone charging box can be used with the earphone at the same time, and the safety of the battery 10 is ensured. The charging voltage of the interface module 20 is input to the voltage input end of the boost module 50 through the diode D1, which provides power supply for the boost module 50, so as to automatically switch the charging voltage input by the interface module 20 as the power supply of the boost module 50 in the case that the interface module 20 has charging voltage input, and improve the endurance time of the battery 10 of the earphone charging box.

[0037] Among them, the PMOS tube Q1 is used as the PMOS tube Q1, its input impedance is high, which means that it has low sensitivity to input signals, which can effectively reduce the interference caused by changes in input signals and improve the stability of the circuit; secondly, the driving power of the PMOS tube Q1 is small, which means that less energy is required to drive the PMOS tube Q1, which helps to reduce the energy consumption of the overall circuit.

[0038] In addition, the power management chip 30 (U1) can also charge the battery 10. When the interface module 20 is connected to the charging voltage, the charging voltage is input to the power management chip 30 (U1), and the power management chip 30 (U1) converts the voltage internally to charge the battery 10. The battery 10 is normally charged, and the battery 10 is only charged and not discharged when the interface module 20 is connected to the charging voltage.

[0039] Reference Figure 4 In an optional embodiment of the present application, the boost module 50 includes a boost management chip U2, an energy storage inductor L1, and an energy storage capacitor C1. The switch end of the boost management chip U2 is connected to the first end of the energy storage inductor L1. The voltage input end of the boost management chip U2 is connected to one end of the energy storage capacitor C1, the source of the PMOS tube Q1, the second end of the energy storage inductor L1, and the negative electrode of the diode D1. The voltage output end of the boost management chip U2 is used to connect the charging end of the external earphone. The enable end EN is connected to the power management chip 30 (U1).

[0040] By setting the boost management chip U2 in cooperation with the energy storage inductor L1 and the energy storage capacitor C1, the input voltage is boosted and output to charge the earphone. The circuit structure is simple, which is beneficial to the miniaturization of the circuit structure. The boost management chip U2 realizes boost output by continuously charging and discharging the energy storage inductor L1 and the energy storage capacitor C1 through the switch end.

[0041] In an optional embodiment of the present application, the boost module 50 further includes a filter unit, which is arranged between the voltage output end of the boost management chip U2 and the charging end of the external earphone.

[0042] By arranging the filter unit between the voltage input end of the boost management chip U2 and the charging end of the earphone, the ripple in the circuit can be reduced, the output voltage is smoother, the quality and stability of the output voltage are improved, a smooth charging voltage is provided for the earphone, and the possibility of damaging the earphone is reduced.

[0043] Specifically, with reference to Figure 4 , the filter unit includes a first filter capacitor C2 and a second filter capacitor C3. The first filter capacitor C2 and the second filter capacitor C3 are connected in parallel. The first parallel node of the first filter capacitor C2 and the second filter capacitor C3 is connected to the voltage output end of the boost management chip U2 and the charging end of the external earphone. The second parallel node is grounded.

[0044] By arranging the first filter capacitor C2 and the second filter capacitor C3 connected in parallel as the filter unit, the total capacity of the overall filter capacitor can be increased by connecting the two filter capacitors in parallel, and the overall filtering effect can be improved. A larger total capacity can better filter out high-frequency noise and ripple, making the output voltage more stable.

[0045] In other embodiments, the filter unit can be provided with multiple parallel filter capacitors to filter out the ripple in the voltage signal and provide a stable charging voltage for charging the earphone.

[0046] In optional embodiments of the present application, referring to Figure 2 , the charging control circuit further comprises an overload protection module 60, a voltage input end of the overload protection module 60 is connected to the interface module 20, a voltage output end of the overload protection module 60 is connected to a second voltage input end of the power supply switching module 40 and a voltage input end of the power management chip 30 (U1).

[0047] By providing the overload protection module 60, the current and voltage can be stabilized within a suitable range in the case of overcurrent or overvoltage input by the interface module 20, thereby protecting the subsequent circuit, i.e., the power supply switching module 40 and the power management chip 30 (U1), and improving the safety of the earphone charging box.

[0048] Specifically, referring to Figure 2 and Figure 5 , the overload protection module 60 comprises an overload protection chip U3, a resistor R1 and a third filter capacitor C4, the resistor R1 is connected in series with the third filter capacitor C4, the other end of the resistor R1 is connected to the voltage input end of the overload protection chip U3 and the interface module 20, the other end of the third filter capacitor C4 is grounded, and the voltage output end of the overload protection chip U3 is connected to the second voltage input end of the power supply switching module 40 and the voltage input end of the power management chip 30 (U1).

[0049] By providing the overload protection chip U3, the charging voltage and current input by the interface module 20 can be stabilized within a suitable range, for example, the charging voltage input by the interface module 20 is stabilized within 5V. The resistor R1 and the first filter capacitor C2 are connected in series to form a filter network for smoothing the voltage and current signals input by the interface module 20, thereby providing a relatively stable input voltage for the overload protection chip U3 and improving the stability of the circuit.

[0050] In optional embodiments of the present application, referring to Figure 2 , the charging control circuit further comprises a Hall switch 70 for sensing the change of magnetic field and outputting a switch cover signal, the Hall switch 70 is connected to the power management chip 30 (U1) to transmit the switch cover signal to the power management chip 30 (U1), the power management chip 30 (U1) outputs a second level signal to the enable pin of the boost module 50 based on the switch cover signal, and the boost module 50 outputs a level communication signal based on the second level signal.

[0051] By setting the Hall switch 70, the magnetic field change can be sensed, when the magnetic field changes, the Hall switch 70 will generate the corresponding switch cover signal, the power management chip 30(U1) outputs the second level signal to the enable pin of the boost module 50 based on the switch cover signal, to enable the boost module 50 to output the level communication signal, trigger the earphone to start and the corresponding terminal equipment to be matched. Specifically, the cover of the earphone charging box is provided with a magnet corresponding to the Hall switch 70, and in the process of the cover from closing to opening, the Hall switch 70 will sense the change of the magnetic field, generate the corresponding switch cover signal, and transmit to the power management chip 30(U1), so that the power management chip 30(U1) can output the corresponding second level signal to enable the boost module 50 to output the level communication signal, to trigger the earphone to start when the cover is opened, and communicate with the external terminal equipment.

[0052] In an optional embodiment of the present application, referring to Figure 6 The interface module 20 includes one or more of a type-C interface J1, a USB-A interface and a lighting interface, and the type-C interface J1, the USB-A interface and the lighting interface are connected with the voltage input end of the power management chip 30(U1) and the second voltage input end of the power switching module 40.

[0053] Taking one or more of the type-C interface J1, the USB-A interface and the lighting interface as the interface for accessing the external charging voltage, the voltage output by the external adapter can be transmitted to the inside of the charging control circuit through the above-mentioned interface, to provide power for the charging of the battery 10 or the earphone. For example, the type-C interface J1 is used as the interface module 20, the type-C interface J1 adopts a reversible design, and no matter how the direction of insertion is, it can be correctly inserted into the device, avoiding the difficulty that may be encountered when the traditional USB interface is inserted; and since more and more charging lines use the connector matched with the type-C interface J1 as the output end, using the type-C interface J1 as the interface module 20 can be compatible with the use of more charging lines, and the compatibility is high.

[0054] The utility model further relates to a preferable embodiment of earphone charging box.

[0055] The earphone charging box comprises a shell, a circuit board and a charging control circuit of an earphone charging box as described above, the charging control circuit is arranged on the circuit board, the circuit board is arranged in the shell, and the shell is provided with a storage compartment for placing an earphone.

[0056] The earphone charging box of the embodiment of the application has a charging control circuit which is provided with a battery 10, an interface module 20, a power management chip 30 (U1), a power switching module 40 and a voltage boosting module 50. The battery 10 and the interface module 20 are connected to the first voltage input end and the second voltage input end of the power switching module 40 respectively. When the interface module 20 inputs a charging voltage, the power switching module 40 is switched to use the charging voltage input by the interface module 20 as the power supply of the voltage boosting module 50. The voltage boosting module 50 performs voltage boosting output under the enablement of the first level signal, thereby reducing the power consumption of the battery 10. Alternatively, when the interface module 20 does not input a voltage, the power management chip 30 (U1) detects the first voltage value of the battery 10, compares the first voltage value with a corresponding preset value and then outputs a first level signal to the voltage boosting module 50. The voltage boosting module 50 performs voltage boosting output or stops voltage boosting output under the enablement of the first level signal, thereby stopping the battery 10 from charging the earphone when the battery 10 is in a low voltage interval, improving the endurance time of the earphone charging box and improving the user experience.

[0057] The voltage output end of the voltage boosting module 50 can be connected to the earphone placed in the storage compartment and output electric energy to charge the earphone.

[0058] It should be understood that the above embodiments are only used to illustrate the technical solutions of the application, rather than limit them. For those skilled in the art, the technical solutions recorded in the above embodiments can be modified or some technical features can be replaced equivalently. All these modifications and replacements should belong to the protection scope of the appended claims of the application.

Claims

1. A charging control circuit for an earphone charging case, characterized in that, The device includes a battery, an interface module, a power management chip, a power switching module, and a boost module. The battery is connected to the first voltage input terminal of the power management chip and the power switching module. The interface module is connected to the voltage input terminal of the power management chip and the second voltage input terminal of the power switching module. The voltage output terminal of the power switching module is connected to the voltage input terminal of the boost module. The power management chip is connected to the enable terminal of the boost module. The voltage output terminal of the boost module is used to connect to the charging terminal of an external headset. The power management chip is used to detect the first voltage value of the battery and the second voltage value input by the interface module. After comparing the first voltage value and the second voltage value with the corresponding preset values, it outputs a first level signal to the boost module. The boost module performs boost output or stops boost output based on the first level signal. The power switching module includes a PMOS transistor and a diode. The gate of the PMOS transistor is connected to the interface module, ground, and the positive terminal of the diode. The drain of the PMOS transistor is connected to the battery. The source of the PMOS transistor is connected to the voltage input terminal of the boost module and the negative terminal of the diode. The positive terminal of the diode is connected to the interface module.

2. The charging control circuit according to claim 1, characterized in that, The boost module includes a boost management chip, an energy storage inductor, and an energy storage capacitor. The switching terminal of the boost management chip is connected to the first terminal of the energy storage inductor. The voltage input terminal of the boost management chip is connected to one end of the energy storage capacitor, the source of the PMOS transistor, the second terminal of the energy storage inductor, and the negative terminal of the diode. The voltage output terminal of the boost management chip is used to connect to the charging terminal of an external headset, and the enable terminal is connected to the power management chip.

3. The charging control circuit according to claim 2, characterized in that, The boost module also includes a filtering unit, which is located between the voltage output terminal of the boost management chip and the charging terminal of the external earphone.

4. The charging control circuit according to claim 3, characterized in that, The filtering unit includes a first filtering capacitor and a second filtering capacitor. The first filtering capacitor and the second filtering capacitor are connected in parallel. The first parallel node of the first filtering capacitor and the second filtering capacitor is connected to the voltage output terminal of the boost management chip and the charging terminal of the external earphone. The second parallel node is grounded.

5. The charging control circuit according to claim 1, characterized in that, The charging control circuit also includes an overload protection module. The voltage input terminal of the overload protection module is connected to the interface module, and the voltage output terminal of the overload protection module is connected to the second voltage input terminal of the power switching module and the voltage input terminal of the power management chip.

6. The charging control circuit according to claim 5, characterized in that, The overload protection module includes an overload protection chip, a resistor, and a third filter capacitor. The resistor and the third filter capacitor are connected in series. The other end of the resistor is connected to the voltage input terminal of the interface module and the overload protection chip. The other end of the third filter capacitor is grounded. The voltage output terminal of the overload protection chip is connected to the second voltage input terminal of the power switching module and the voltage input terminal of the power management chip.

7. The charging control circuit according to claim 1, characterized in that, The charging control circuit also includes a Hall switch for sensing changes in the magnetic field and outputting a cover switching signal. The Hall switch is connected to the power management chip and transmits the cover switching signal to the power management chip. The power management chip outputs a second-level signal to the enable pin of the boost module based on the cover switching signal. The boost module outputs a level communication signal based on the second-level signal.

8. The charging control circuit according to claim 1, characterized in that, The interface module includes one or more of a type-C interface, a USB-A interface, and a lighting interface. The type-C interface, USB-A interface, and lighting interface are all connected to the voltage input terminal of the power management chip and the second voltage input terminal of the power switching module.

9. An earphone charging case, characterized in that, The device includes a housing, a circuit board, and a charging control circuit for an earphone charging case as described in any one of claims 1-8. The charging control circuit is disposed on the circuit board, which is located inside the housing. The housing has a storage compartment for holding the earphones.

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