Control circuit of earphone charging cabin and earphone charging cabin

Abstract

The embodiment of the utility model provides a control circuit of an earphone charging bin and the earphone charging bin, and belongs to the technical field of Bluetooth earphones. The control circuit of the earphone charging bin comprises a data processing module, a charging control chip and an earphone load detection module, the input end of the earphone load detection module is detachably connected with the earphone, and the output end of the earphone load detection module is electrically connected with the charging control chip. The earphone load detection module detects earphone load current formed by load change brought by the earphone and outputs the earphone load current to the charging control chip; the charging control chip generates an interrupt signal according to the earphone load current and sends the interrupt signal to the data processing module; the data processing module generates a control signal based on the interrupt signal and performs power consumption mode control according to the control signal. Therefore, according to the embodiment of the invention, the control circuit of the earphone charging bin can perform power consumption mode control without depending on a Hall element, and the accuracy of power consumption mode control of the control circuit is improved.

Description

Technical Field

[0001] This application relates to the field of Bluetooth headset technology, and in particular to a control circuit for a headset charging case and a headset charging case. Background Technology

[0002] Existing headphone charging case control circuits rely on Hall effect sensors for power consumption mode control. Specifically, a magnet is embedded in a specific location on the Bluetooth earbuds, and a Hall effect sensor is placed in a specific location on the charging case. When the earbuds are placed in the charging case, the magnet approaches the Hall effect sensor, which senses the change in the magnetic field and converts it into an electrical signal. This signal is then transmitted to the charging case's control circuit, which controls the power consumption mode based on the received signal. However, Hall effect sensors are susceptible to temperature changes, which can reduce the accuracy of power consumption mode control. Furthermore, they are easily affected by external magnetic fields, causing the charging case's control circuit to operate in an incorrect power consumption mode. Therefore, improving the accuracy of power consumption mode control in headphone charging case control circuits has become a pressing technical problem. Utility Model Content

[0003] The main objective of this application is to provide a control circuit and a charging case for earphones, aiming to improve the accuracy of power consumption mode control by the control circuit of the earphone charging case.

[0004] To achieve the above objectives, a first aspect of this application provides a control circuit for an earphone charging case, the control circuit comprising: a data processing module, a charging control chip, and an earphone load detection module;

[0005] The input terminal of the headphone load detection module can be detachably connected to the headphone, and the output terminal of the headphone load detection module is electrically connected to the charging control chip. The headphone load detection module is used to detect the current formed by the load change brought by the headphone to obtain the headphone load current, and output the headphone load current to the charging control chip.

[0006] The charging control chip generates an interrupt signal based on the headphone load current and sends the interrupt signal to the data processing module.

[0007] The data processing module generates a control signal based on the interrupt signal, and controls the earphone charging case to enter a low-power mode or a high-power mode according to the control signal.

[0008] In some embodiments, the headphone load current includes the left headphone load current and the right headphone load current, the headphone includes a left headphone and a right headphone, and the headphone load detection module includes:

[0009] The left ear load detection circuit is used to detect the current formed by the load change brought by the left earphone to obtain the load current of the left earphone. The input terminal of the left ear load detection circuit is detachably connected to the left earphone, and the output terminal of the left ear load detection circuit is electrically connected to the charging control chip.

[0010] The right ear load detection circuit is used to detect the current formed by the load change brought by the right earphone to obtain the load current of the right earphone. The input terminal of the right ear load detection circuit is detachably connected to the right earphone, and the output terminal of the right ear load detection circuit is electrically connected to the charging control chip.

[0011] In some embodiments, the left ear load detection circuit includes: a left positive spring pin, a second electrostatic discharge protection device, and a left negative spring pin connected in sequence;

[0012] The left earphone power terminal of the charging control chip is electrically connected to the left positive spring pin and the second electrostatic discharge protection device.

[0013] The second electrostatic discharge protection device and the left negative spring pin are grounded.

[0014] In some embodiments, the right ear load detection circuit includes: a right positive spring pin, a third electrostatic discharge protection device, and a right negative spring pin connected in sequence;

[0015] The right earphone power terminal of the charging control chip is electrically connected to the right positive spring pin and the third electrostatic discharge protection device.

[0016] The third electrostatic discharge protection device and the right negative spring pin are grounded.

[0017] In some embodiments, the control circuit further includes: a charging module, a charging switching module, an input voltage detection module, and a charging current control module;

[0018] The charging switching module is electrically connected to the charging module, the data processing module and the charging control chip. The charging switching module is used to output wireless charging voltage to the data processing module.

[0019] The input voltage detection module is electrically connected to the charging switching module, the adapter input terminal of the charging control chip, and the data processing module. The input voltage detection module is used to output the adapter voltage to the data processing module.

[0020] The charging current control module is electrically connected to the data processing module and the charging control chip;

[0021] The data processing module determines the charging mode of the control circuit of the earphone charging case based on the wireless charging voltage and the adapter voltage, and outputs a segmented current control signal according to the charging mode.

[0022] The charging current control module sets the charging current of the earphones according to the current segmentation control signal output by the data processing module.

[0023] In some embodiments, the charging current control module includes: a fifth NMOS transistor, a tenth resistor, a sixteenth resistor, a thirty-fifth resistor, a fourteenth resistor, and a sixty-seventh capacitor;

[0024] The source of the fifth NMOS transistor is grounded, the gate of the fifth NMOS transistor is electrically connected to the tenth resistor, the tenth resistor is grounded, and the sixth port of the data processing module is electrically connected to the gate of the fifth NMOS transistor and the tenth resistor.

[0025] The sixteenth resistor is electrically connected to the drain of the fifth NMOS transistor and the thirty-fifth resistor, and the thirty-fifth resistor is electrically connected to the charging current setting terminal of the charging control chip.

[0026] One end of the fourteenth resistor is connected to the charging current setting terminal, and the other end of the fourteenth resistor is grounded.

[0027] One end of the sixty-seventh capacitor is electrically connected to the sixteenth resistor and the thirty-fifth resistor, and the other end of the sixty-seventh capacitor is grounded.

[0028] In some embodiments, the input voltage detection module includes: a twentieth resistor and a twenty-second resistor;

[0029] The adapter input terminal of the charging control chip and the charging switching module are electrically connected to the 22nd resistor, the 22nd resistor is electrically connected to the 20th resistor, and the 20th resistor is grounded.

[0030] The fourteenth port of the data processing module is electrically connected to the twentieth resistor and the twenty-second resistor.

[0031] In some embodiments, the control circuit further includes a data processing reset circuit;

[0032] The data processing reset circuit is electrically connected to the charging switching module and the data processing module;

[0033] When the control circuit of the earphone charging case is in the low-power mode, the data processing module detects the adapter voltage through the data processing reset circuit, and controls the control circuit of the earphone charging case to switch from the low-power mode to the high-power mode according to the adapter voltage.

[0034] In some embodiments, the control circuit further includes: a battery and a battery access circuit;

[0035] The battery access circuit includes: a third inductor, a seventieth capacitor, and a seventy-second capacitor;

[0036] The switch output terminal of the charging control chip is electrically connected to the third inductor, and the third inductor is electrically connected to the positive terminal of the battery;

[0037] The positive input terminal of the charging control chip is electrically connected to the positive terminal of the battery.

[0038] One end of the seventieth capacitor is electrically connected to the positive terminal of the battery and the third inductor, and the other end of the seventieth capacitor is grounded;

[0039] The seventy-second capacitor and the seventieth capacitor are connected in parallel.

[0040] To achieve the above objectives, a second aspect of the present application provides an earphone charging case, which includes the control circuit proposed in the first aspect of the present application.

[0041] The control circuit and charging case of the earphones proposed in this application, by setting a data processing module, a charging control chip, and an earphone load detection module in the control circuit, allows the earphones to be detachably connected through the input terminal of the earphone load detection module, and the output terminal of the earphone load detection module to be electrically connected to the charging control chip. This enables the earphone load detection module to obtain the earphone load current by detecting the current generated by the load changes brought by the earphones, and output the earphone load current to the charging control chip. Then, the charging control chip generates an interrupt signal based on the earphone load current and sends the interrupt signal to the data processing module. Finally, the data processing module generates a control signal based on the interrupt signal, and controls the earphone charging case to enter a low-power mode or a high-power mode according to the control signal. Therefore, the control circuit and charging case of the earphone charging case shown in this application embodiment, by setting a data processing module, a charging control chip, and an earphone load detection module, enable the control circuit of the earphone charging case to obtain the earphone load current by detecting the current formed by the load change brought by the earphone, and control the power consumption mode of the earphone charging case according to the load current. This eliminates the need for the control circuit of the earphone charging case to rely on Hall elements for power consumption mode control, reduces the impact of factors such as temperature changes and external magnetic field interference on Hall elements and power consumption mode control of the earphone charging case, and improves the accuracy of power consumption mode control by the control circuit of the earphone charging case. Attached Figure Description

[0042] Figure 1This is a block diagram of the control circuit of the earphone charging case provided in an embodiment of this application;

[0043] Figure 2 This is another implementable module block diagram of the control circuit of the earphone charging case provided in the embodiments of this application;

[0044] Figure 3 This is an implementable circuit diagram of the control circuit for the earphone charging case provided in an embodiment of this application;

[0045] Figure 4 This is a circuit diagram of the data processing module provided in an embodiment of this application;

[0046] Figure 5 This is a circuit diagram of the charging switching module provided in an embodiment of this application;

[0047] Figure 6 This is a module block diagram of the charging module provided in the embodiments of this application;

[0048] Figure 7 This is a circuit diagram of the wireless charging sub-module provided in an embodiment of this application;

[0049] Figure 8 This is an implementable circuit diagram of a wired charging submodule provided in an embodiment of this application;

[0050] Figure 9 This is another implementable circuit diagram of the wired charging sub-module provided in the embodiments of this application;

[0051] Figure 10 This is a circuit diagram of the voltage conversion module provided in the embodiments of this application;

[0052] Figure 11 This is a circuit diagram of the battery power detection circuit provided in an embodiment of this application;

[0053] Figure 12 This is a circuit diagram of the data processing reset circuit provided in the embodiments of this application;

[0054] Figure 13 This is a circuit diagram of the communication control circuit provided in the embodiments of this application. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0056] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0058] Figure 1 This is an optional module block diagram of the control circuit for the earphone charging case provided in this application embodiment. The earphone charging case is a device that provides charging and storage functions for earphones. The charging case has a dedicated charging slot inside for holding the earphones. When the earphones are placed in the charging slot, the charging case charges the earphones through its built-in control circuit. The earphone charging case can be an Open Wireless Stereo (OWS) earphone charging case, a True Wireless Stereo (TWS) earphone charging case, or other earphone charging cases. The earphones can be any of the following: Bluetooth earphones, sports earphones, ear-hook earphones, open-back Bluetooth earphones, bone conduction Bluetooth earphones, clip-on Bluetooth earphones, noise-canceling earphones, wireless stereo earphones, Dolby Bluetooth earphones, or other earphones.

[0059] like Figure 1As shown, the control circuit includes: an earphone load detection module 100, a charging control chip 200, and a data processing module 300. The input terminal of the earphone load detection module 100 is detachably connected to the earphone, and the output terminal of the earphone load detection module 100 is electrically connected to the charging control chip 200. The charging control chip 200 is communicatively connected to the data processing module 300. The earphone load detection module 100 detects the current generated by the load change brought by the earphone to obtain the earphone load current and outputs the earphone load current to the charging control chip 200. The charging control chip 200 generates an interrupt signal based on the earphone load current and sends the interrupt signal to the data processing module 300. The data processing module 300 generates a control signal based on the interrupt signal and controls the earphone charging case to enter either a low-power mode or a high-power mode according to the control signal. Therefore, the control circuit and charging case of the earphone charging case shown in this application embodiment, by setting a data processing module, a charging control chip, and an earphone load detection module, enable the control circuit of the earphone charging case to obtain the earphone load current by detecting the current formed by the load change brought by the earphone, and control the power consumption mode of the earphone charging case according to the load current. This eliminates the need for the control circuit of the earphone charging case to rely on Hall elements for power consumption mode control, reduces the impact of factors such as temperature changes and external magnetic field interference on Hall elements and power consumption mode control of the earphone charging case, and improves the accuracy of power consumption mode control by the control circuit of the earphone charging case.

[0060] It should be noted that the current generated by the load change caused by the headphones specifically refers to the following: when the headphones are connected to the control circuit, the charging circuit on the headphones is connected to the headphone load detection module 100; or when the headphones are disconnected from the control circuit, the charging circuit on the headphones is disconnected from the headphone load detection module 100. In both cases, the load of the headphones causes a change in the total load in the headphone load detection module 100, thereby causing a change in the current in the headphone load detection module 100. Specifically, in this embodiment, when the headphones are connected to the control circuit, the charging circuit of the headphones is connected to the circuit of the headphone load detection module 100, resulting in a current in the headphone load detection module 100, i.e., the headphone load current. When the headphones are disconnected from the control circuit, the connection between the charging circuit on the headphones and the headphone load detection module 100 is interrupted, causing the circuit of the headphone load detection module 100 to disconnect, thus causing the headphone load current to disappear.

[0061] In some embodiments, as the headphone battery level increases during headphone charging, the headphone load gradually decreases, and the load current in the headphone load detection module 100 gradually decreases. Therefore, the charging control chip 200 can send an interrupt signal to the data processing module 300 based on the received load current and the charging start / stop current threshold. The interrupt signal includes: a headphone insertion signal, a headphone removal signal, and a charging end signal. The headphone insertion signal indicates that the headphone is connected to the headphone load detection module 100; the headphone removal signal indicates that the headphone is disconnected from the headphone load detection module 100; and the charging end signal indicates that the headphone is fully charged. When the headphone is connected to the headphone load detection module 100, the charging control chip 200 sends a headphone insertion signal to the data processing module 300; when the headphone is disconnected from the headphone load detection module 100, the charging control chip 200 sends a headphone removal signal to the data processing module 300; if the load current is lower than the charging start / stop current threshold and the charging control chip 200 is in a high-power mode, the charging control chip 200 sends a charging end signal to the data processing module 300.

[0062] In some embodiments, the data processing module 300 generates a control signal based on the received interrupt signal and sends the control signal to the charging control chip 200. The control signal includes a high-power switching signal and a low-power switching signal. The high-power switching signal indicates that the earphone charging case needs to enter a high-power mode, and the low-power switching signal indicates that the earphone charging case needs to enter a low-power mode. Upon receiving an earphone insertion signal, the data processing module 300 generates a high-power switching signal and sends it to the charging control chip 200, causing the charging control chip 200 to enter a high-power mode. Upon receiving a charging completion signal or an earphone removal signal, the data processing module 300 generates a low-power switching signal and sends it to the charging control chip 200, causing the charging control chip 200 to enter a low-power mode. In addition, the low-power switching signals include: an earphone in-charge lock signal and an earphone out-of-charge lock signal. When the data processing module 300 receives a charging end signal, it generates an earphone in-charge lock signal and sends it to the charging control chip 200, so that the charging control chip 200 locks the earphone in-charge state according to the earphone in-charge lock signal. When the data processing module 300 receives an earphone out-of-charge signal, it generates an earphone out-of-charge lock signal and sends it to the charging control chip 200, so that the charging control chip 200 performs earphone access detection according to the earphone out-of-charge lock signal to detect whether the earphone is connected to the earphone load detection module 100.

[0063] like Figure 2As shown, the control circuit also includes: a charging module 400, a charging switching module 500, an input voltage detection module 600, a charging current control module 700, a voltage conversion module 800, and a battery 900.

[0064] In some embodiments, the charging switching module 500 is electrically connected to the charging module 400, the data processing module 300, and the charging control chip 200. The charging switching module 500 is used to output wireless charging voltage to the data processing module 300 and to supply power to the charging control chip 200.

[0065] In some embodiments, the input voltage detection module 600 is electrically connected to the charging switching module 500, the charging control chip 200, and the data processing module 300. The input voltage detection module 600 is used to output adapter voltage to the control circuit to power the control circuit.

[0066] In some embodiments, the charging current control module 700 is electrically connected to the data processing module 300 and the charging control chip 200. The data processing module 300 determines the charging mode of the earphone charging case control circuit based on the wireless charging voltage and the adapter voltage, and outputs a segmented current control signal according to the charging mode. The charging current control module 700 sets the charging current of the earphones according to the segmented current control signal output by the data processing module 300.

[0067] In some embodiments, the voltage conversion module 800 is electrically connected to the data processing module 300, the charging switching module 500, and the battery 900.

[0068] In some embodiments, the battery 900 is electrically connected to the data processing module 300 and the charging control chip 200.

[0069] like Figure 3 As shown, in some embodiments, the headphone load current includes the left headphone load current and the right headphone load current. The headphones include a left headphone and a right headphone. The charging control chip 200 can be model SY8803-CEQLR. The headphone load detection module 100 includes a left ear load detection circuit and a right ear load detection circuit. The left ear load detection circuit detects the current generated by the load change brought by the left headphone to obtain the left headphone load current. The input terminal of the left ear load detection circuit is detachably connected to the left headphone, and the output terminal is electrically connected to the charging control chip 200. The right ear load detection circuit detects the current generated by the load change brought by the right headphone to obtain the right headphone load current. The input terminal of the right ear load detection circuit is detachably connected to the right headphone, and the output terminal is electrically connected to the charging control chip 200.

[0070] In some embodiments, the charging control chip 200 has a left earphone power terminal VOL, and the left ear load detection circuit includes: a left positive spring pin L+, a second electrostatic discharge (ESD) protection device E2, and a left negative spring pin L- connected in sequence. The input terminals of the left ear load detection circuit are the left positive spring pin L+ and the left negative spring pin L-. The left positive spring pin L+ is detachably connected to the positive terminal of the charging circuit of the left earphone, and the left positive spring pin L- is detachably connected to the negative terminal of the charging circuit of the left earphone. The second ESD protection device E2 and the left negative spring pin L- are grounded. The left earphone power terminal VOL of the charging control chip 200 is electrically connected to the left positive spring pin L+ and the second ESD protection device E2. The second ESD protection device E2 may be of model NC / ESD5V5DG100B. Therefore, when the earphone is connected to the left ear load detection circuit, the left ear load detection circuit can form a circuit through the left positive spring pin L+, the charging circuit of the left earphone and the left negative spring pin L-, and transmit the load of the left earphone to the left earphone power terminal VOL of the charging control chip 200 in the form of load current.

[0071] In some embodiments, the left ear load detection circuit further includes a thirteenth electrostatic discharge (ESD) protection device E13. One end of the thirteenth ESD protection device E13 is electrically connected to the second ESD protection device E2 and the left load detection terminal VOL, and the other end of the thirteenth ESD protection device E13 is grounded. The model of the thirteenth ESD protection device E13 can be NC / ESD5V5DG100B.

[0072] In some embodiments, the charging control chip 200 also has a right earphone power terminal VOL. The right ear load detection circuit includes: a right positive spring pin R+, a third electrostatic discharge protection device E3, and a right negative spring pin R- connected in sequence. The input terminals of the right ear load detection circuit are the right positive spring pin R+ and the right negative spring pin R-. The right positive spring pin R+ is detachably connected to the positive terminal of the right earphone's charging circuit, and the right negative spring pin R- is detachably connected to the negative terminal of the right earphone's charging circuit. The third electrostatic discharge protection device E3 and the right negative spring pin R- are grounded. The right earphone power terminal VOL of the charging control chip 200 is electrically connected to the right positive spring pin R+ and the third electrostatic discharge protection device E3. The third electrostatic discharge protection device E3 can be of model NC / ESD5V5DG100B. Therefore, when the earphone is connected to the right ear load detection circuit, the right ear load detection circuit can form a circuit through the left positive spring pin R+, the charging circuit of the right earphone and the right negative spring pin R-. The right ear load detection circuit can then transmit the load of the right earphone to the right earphone power terminal VOR of the charging control chip 200 in the form of load current.

[0073] In some embodiments, the right ear load detection circuit further includes a twelfth electrostatic discharge (ESD) protection device E12. One end of the twelfth ESD protection device E12 is electrically connected to the right positive spring pin R+ and the third ESD protection device E3, and the other end of the twelfth ESD protection device E12 is grounded. The twelfth ESD protection device E12 may be of model NC / ESD5V5DG100B.

[0074] Please refer to Figure 3 and Figure 4 In some embodiments, the charging control chip 200 has a serial data terminal SDA, a serial clock terminal SCL, and an interrupt output terminal IRQ. The serial data terminal SDA and the serial clock terminal SCL are used to receive control signals, and the interrupt output terminal IRQ is used to send an interrupt signal to the data processing module 300. Specifically, the serial data terminal SDA is connected to the eighth port C_I2C_SDA of the data processing module 300 via a serial data line. The serial clock terminal SCL of the charging control chip 200 is connected to the seventh port C_I2C_SCL of the data processing module 300 via a serial time line. The interrupt output terminal IRQ is communicatively connected to the tenth port C_IRQ of the data processing module 300. Therefore, when the left earphone power terminal VOL or the right earphone power terminal VOR receives load current, the charging control chip 200 can send an interrupt signal to the data processing module 300 according to the load current and receive the control signal sent by the data processing module 300, so as to enter a low-power mode or a high-power mode according to the control signal.

[0075] In some embodiments, the control circuit further includes a battery access circuit 1000. The battery access circuit 1000 includes a third inductor L3, a 70th capacitor C70, and a 72nd capacitor C72. The switching output terminal LX of the charging control chip 200 is electrically connected to the third inductor L3, which is electrically connected to the positive terminal BAT+ of the battery 900. The battery positive input terminal BAT of the charging control chip 200 is electrically connected to the positive terminal BAT+ of the battery 900. One end of the 70th capacitor C70 is electrically connected to both the positive terminal BAT+ of the battery 900 and the third inductor L3, while the other end of the 70th capacitor C70 is grounded. The 72nd capacitor C72 and the 70th capacitor C70 are connected in parallel. Therefore, the charging control chip 200 can charge the headphones through the connected battery 900. It is understandable that the model of the third inductor L3 is HMD4040R332MJCC0, and the specific value of the third inductor L3 can be 3.3uH. The specific value of the seventieth capacitor C70 can be 10nF / 25V, and the specific value of the seventy-second capacitor C72 can be 100nF / 50V.

[0076] In some embodiments, the eighteenth port PCK of the data processing module 300 is connected to the programming power supply and the sixty-fifth resistor R65 for clock control. The specific value of the sixty-fifth resistor R65 can be 10 kΩ. The twenty-second and twenty-fifth ports of the data processing module 300 are grounded.

[0077] Understandably, the data processing module 300 is a microcontroller chip with the model number MC9904B0ZG.

[0078] It should be noted that when the charging control chip 200 is in high-power mode, it will charge the headphones connected to the headphone load detection module 100. In this mode, the voltage across the headphone charging circuit is the charging voltage, specifically 5V. When the charging control chip 200 is in low-power mode, it will not charge the headphones connected to the headphone load detection module 100. In this mode, the voltage across the headphone charging circuit is the battery voltage, which can be 3.7V. Furthermore, the charging control chip 200 continuously monitors the load current output by the headphone load detection module 100 in both high-power and low-power modes.

[0079] In some embodiments, the charging control chip 200 has a light-load shutdown current setting terminal IOFF, which is electrically connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded. The light-load shutdown current setting terminal IOFF is used to set the charging start-stop current threshold. For example, the specific value of the twelfth resistor R12 can be 100 kΩ, and the specific value of the charging start-stop current threshold can be 5 mA.

[0080] Please refer to Figure 3 , Figure 5 , Figure 6 and Figure 7In some embodiments, the charging module 400 includes a wired charging submodule 410 and a wireless charging submodule 420. It is understood that the wireless charging submodule 420 is a wireless charging control chip 200 of model number CWR-0526Q, and the wireless charging submodule 420 has a wireless charging enable terminal ENB and a wireless voltage output terminal VOUT. The charging switching module 500 also has a wired charging input terminal USB_VBUS and a wireless charging input terminal WIRELESS_5V. The output terminal of the wired charging submodule 410 is electrically connected to the wired charging input terminal USB_VBUS of the charging switching module 500; the wireless voltage output terminal VOUT of the wireless charging submodule 420 is electrically connected to the wireless charging input terminal WIRELESS_5V of the charging switching module 500; the output terminal USB_IN_5V of the charging switching module 500 is electrically connected to the adapter input terminal VIN of the charging control chip 200; and the adapter input terminal VIN is electrically connected to the seventy-third capacitor C73. When the earphone charging case is being charged via the wired charging submodule 410 and the wireless charging submodule 420, the charging switching module 500 will output a 5V voltage. The specific value of the seventy-third capacitor C73 can be 4.7uF / 50V.

[0081] In some embodiments, the charging switching module 500 includes: a first electrostatic discharge (ESD) protection device E1, a fourteenth ESD protection device E14, a switch Q6, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a sixty-third resistor R63, a sixty-fourth resistor R64, and a thirty-second capacitor C32. The first ESD protection device E1 and the fourteenth ESD protection device E14 are of model NC / ESD5V5DG100B, the switch Q6 is of model YJS2301A, the specific value of the twenty-fifth resistor R25 can be 5.1 kΩ, the specific value of the twenty-sixth resistor R26 can be 100 kΩ, the specific value of the twenty-seventh resistor R27 can be 10 kΩ, the specific value of the twenty-eighth resistor R28 can be 10 kΩ, the specific value of the sixty-third resistor R63 can be 5.1 kΩ, the specific value of the sixty-fourth resistor R64 can be 100 kΩ, and the specific value of the thirty-second capacitor C32 can be 100 nF / 50V. Specifically, switch Q6 includes two PMOS transistors with their sources connected; the wired charging input terminal USB_VBUS is electrically connected to the first electrostatic discharge protection device E1, the twenty-fifth resistor R25, the twenty-seventh resistor R27 and the first drain D1 of switch Q6, the electrostatic discharge protection device E1 is grounded, the twenty-fifth resistor R25 is electrically connected to the sixty-fourth resistor R64, the sixty-fourth resistor R64 is grounded, the thirty-second capacitor C32 is connected in parallel with the sixty-fourth resistor R64, the twenty-seventh resistor R27 is electrically connected to the twenty-eighth resistor R28, the twenty-eighth resistor R28 is grounded, and the second gate G2 of switch Q6 is electrically connected to the twenty-fifth resistor R25, the thirty-second capacitor C32 and the sixty-fourth resistor R64. The wireless charging input terminal WIRELESS_5V is electrically connected to the fourteenth electrostatic discharge protection device E14, the sixty-third resistor R63, and the second drain D2 of switch Q6. The fourteenth electrostatic discharge protection device E14 is grounded. The sixty-third resistor R63 is electrically connected to the twenty-sixth resistor R26. The twenty-sixth resistor R26 is grounded. The first gate G1 of switch Q6 is electrically connected to the sixty-third resistor R63 and the twenty-sixth resistor R26.

[0082] In some embodiments, the wireless charging enable terminal ENB of the wireless charging submodule 420 is electrically connected to the enable output terminal WIRELESS_FULL_EN1 of the charging switching module 500, and electrically connected to the twenty-seventh resistor R27 and the twenty-eighth resistor R28. This allows the wired charging submodule 410 and the wireless charging submodule 420 to charge the earphone charging case simultaneously, so that when the wired charging input terminal USB_VBUS inputs a high level, the level of the enable output terminal WIRELESS_FULL_EN1 will be pulled high, causing the enable output terminal WIRELESS_FULL_EN1 to control the wireless charging submodule 420 to stop charging the earphone charging case. This achieves priority charging of the earphone charging case by the wired charging submodule 410.

[0083] In some embodiments, the wireless charging input terminal WIRELESS_5V is connected to the wireless charging detection circuit 1100, and the output terminal of the wireless charging detection circuit 1100 is electrically connected to the data processing module 300, enabling the data processing module 300 to detect whether the charging mode of the earphone charging case is wireless charging mode or not. Specifically, the wireless charging input terminal WIRELESS_5V is connected to the wireless charging detection circuit 1100. The wireless charging detection circuit 1100 includes a 57th resistor R57 and a 58th resistor R58. One end of the 57th resistor R57 is grounded, and the other end of the 57th resistor R57 is electrically connected to one end of the 58th resistor R58. The other end of the 58th resistor R58 is electrically connected to the wireless charging input terminal WIRELESS_5V. The 15th port W_IN_DET of the data processing module 300 is electrically connected to the 57th resistor R57 and the 58th resistor R58. For example, the specific value of the 57th resistor R57 can be 10 kΩ, and the specific value of the 58th resistor R58 can be 100 kΩ.

[0084] Please refer to Figure 3 , Figure 4 and Figure 5 In some embodiments, the input voltage detection module 600 includes a twentieth resistor R20 and a twenty-second resistor R22. The adapter input terminal VIN of the charging control chip 200 and the charging switching module 500 are electrically connected to one end of the twenty-second resistor R22, the other end of the twenty-second resistor R22 is electrically connected to one end of the twentieth resistor R20, and the other end of the twentieth resistor R20 is grounded. The fourteenth port 5V_IN_DET of the data processing module 300 is electrically connected to both the twentieth resistor R20 and the twenty-second resistor R22. The specific value of the twentieth resistor R20 can be 10 kΩ, and the specific value of the twenty-second resistor R22 can be 100 kΩ.

[0085] In some embodiments, the fifteenth port W_IN_DET of the data processing module 300 detects the output voltage of the wireless charging detection circuit 1100, and the fourteenth port 5V_IN_DET of the data processing module 300 detects the adapter voltage output by the charging switching module 500, enabling the data processing module 300 to determine the charging mode of the earphone charging case. Specifically, if neither the fifteenth port W_IN_DET nor the fourteenth port 5V_IN_DET detects an output voltage, it indicates that the earphone charging case is not in charging mode; if both the fifteenth port W_IN_DET and the fourteenth port 5V_IN_DET detect an output voltage, it indicates that the earphone charging case is in wireless charging mode; if the fifteenth port W_IN_DET does not detect an output voltage, but the fourteenth port 5V_IN_DET detects an output voltage, it indicates that the earphone charging case is in wired charging mode.

[0086] Please refer to Figure 3 and Figure 4 In some embodiments, the charging current control module 700 includes: a fifth NMOS transistor Q5, a tenth resistor R10, a sixteenth resistor R16, a thirty-fifth resistor R35, a fourteenth resistor R14, and a sixty-seventh capacitor C67. Specifically, the source of the fifth NMOS transistor Q5 is grounded, the gate of the fifth NMOS transistor Q5 is electrically connected to the tenth resistor R10, the tenth resistor R10 is grounded, and the sixth port CH-ICH of the data processing module 300 is electrically connected to the gate of the fifth NMOS transistor Q5 and the tenth resistor R10. The sixteenth resistor R16 is electrically connected to the drain of the fifth NMOS transistor Q5 and the thirty-fifth resistor R35, and the thirty-fifth resistor R35 is electrically connected to the charging current setting terminal of the charging control chip 200. One end of the fourteenth resistor R14 is connected to the charging current setting terminal ICH, and the other end of the fourteenth resistor R14 is grounded. One end of the sixty-seventh capacitor C67 is electrically connected to the sixteenth resistor R16 and the thirty-fifth resistor R35, and the other end of the sixty-seventh capacitor C67 is grounded.

[0087] Please refer to Figure 3 and Figure 4 In some embodiments, the battery temperature detection terminal BAT_NTC of the battery 900 is electrically connected to the thirteenth port C_BAT_NTC of the data processing module 300, enabling the data processing module 300 to detect the battery temperature.

[0088] In some embodiments, the data processing module 300 can set the maximum value of the charging current based on the detected battery temperature and the charging mode of the earphone charging case. When the data processing module 300 detects a battery temperature of 0 to 12 degrees Celsius, the sixth port CH-ICH of the data processing module 300 will output a low level, and the fifth NMOS transistor Q5 will be turned off. At this time, the sixteenth resistor R16 and the thirty-fifth resistor R35 in the charging current control module 700 will not be conducting, only the fourteenth resistor R14 will be conducting, and the maximum charging current at the charging current setting terminal ICH is 82mA. When the data processing module 300 detects a battery temperature of 13 to 45 degrees Celsius, if the earphone charging case is in wired charging mode, the sixth port CH-ICH of the data processing module 300 will output a high level, and the fifth NMOS transistor Q5 will be turned on. At this time, the fourteenth resistor R14, the sixteenth resistor R16, and the thirty-fifth resistor R35 in the charging current control module 700 will be conducting, and the maximum charging current at the charging current setting terminal ICH is 460mA. If the earphone charging case is in wireless charging mode, the maximum charging current of the charging current setting terminal ICH is set to 280mA.

[0089] In some embodiments, the charging control chip 200 further includes a temperature detection input terminal NTC, an enable terminal EN, and a BOOST output terminal VSYS. The temperature detection input terminal NTC is electrically connected to the forty-third resistor R43, which is grounded. The NTC is used to detect the ambient temperature of the earphone compartment. The enable terminal EN is electrically connected to the forty-eighth resistor R48, which is grounded. The BOOST output terminal VSYS is electrically connected to the sixty-fourth capacitor, which is grounded. For example, the specific value of the forty-third resistor R43 could be 10 kΩ, the specific value of the forty-eighth resistor R48 could be 1 kΩ, and the specific value of the sixty-fourth capacitor could be 10uF / 25V. It should be noted that the forty-third resistor R43 can be a thermistor to convert the ambient temperature of the earphone compartment into an input current or input voltage for the temperature detection input terminal NTC.

[0090] Please refer to Figure 8 and Figure 9 In some embodiments, the wired charging submodule 410 includes a USB access circuit, an overvoltage protection circuit, a filtering circuit, a surge protection circuit, an internal interface J1, an external interface J2, and a display module 1200. The USB access circuit includes a TYPE-C interface J3, which has a bus power terminal VBUS. The model number of the TYPE-C interface J3 is 8.94-7.35-3.16-16P.

[0091] In some embodiments, the surge protection circuit includes a surge protector D9, model ESD401J24FUP. The first and second terminals of surge protector D9 are electrically connected to the bus power supply terminal VBUS of the TYPE-C interface J3 and the filter circuit. The third terminal of surge protector D9 is grounded. The voltage protection level of surge protector can be set to 120V. When the voltage of the bus power supply terminal VBUS exceeds 120V, the surge protector will provide surge protection for the control circuit.

[0092] In some embodiments, one end of the filter circuit is electrically connected to the overvoltage protection circuit, and the other end of the filter circuit is grounded. The filter circuit includes an 84th capacitor C84 and an 85th capacitor C85 connected in parallel. The specific value of the 84th capacitor C84 can be 4.7uF 50V, and the specific value of the 85th capacitor C85 can be 100uF 50V.

[0093] In some embodiments, the overvoltage protection circuit includes a first resistor R1, a second resistor R2, an overvoltage protector U11, a thirty-ninth resistor R39, and a one-twenty-sixth capacitor C126. The input terminal IN of the overvoltage protector U11 is electrically connected to the first resistor R1 and the eighty-fifth capacitor C85. The overvoltage lockout terminal OVLO of the overvoltage protector U11 is electrically connected to the first resistor R1 and the second resistor R2, with the second resistor R2 grounded. The current limiting terminal ILIM of the overvoltage protector U11 is electrically connected to the thirty-ninth resistor R39, with the thirty-ninth resistor R39 grounded. The output terminal of the overvoltage protector U11 is electrically connected to the internal interface J1 and the one-twenty-sixth capacitor C126. The overvoltage protector U11 is model WSPD2602. The specific value of the first resistor R1 can be 180 kΩ, the specific value of the second resistor R2 can be 47 kΩ, and the overvoltage protection threshold voltage can be set to 5.8V; the specific value of the thirty-ninth resistor R39 can be 4.7 kΩ, and the overcurrent protection threshold current can be set to 950mA; the specific value of the one hundred and twenty-sixth capacitor C126 can be 4.7uF / 50V.

[0094] In some embodiments, due to the encapsulation of the wired charging submodule 410, it is necessary to connect the wired charging submodule 410 and the control circuit through an internal interface J1 provided on the wired charging submodule 410 and an external interface J2 provided on the control circuit. Specifically, the first and second ports of the internal interface J1 are electrically connected to the output terminal of the overvoltage protector U11, the third and fourth ports of the internal interface J1 are grounded, the fifth and sixth ports of the internal interface J1 are electrically connected to the display module 1200, and the seventh and eighth ports of the internal interface J1 are grounded. The display module 1200 includes a first LED U_LED1_Y and a second LED U_LED1_W, wherein the positive terminal of the first LED U_LED1_Y is electrically connected to the fifth port of the internal interface J1, and the negative terminal of the first LED U_LED1_Y is grounded; the positive terminal of the second LED U_LED1_W is electrically connected to the sixth port of the internal interface J1, and the negative terminal of the second LED U_LED1_W is grounded. The first and second ports of external interface J2 are connected to the first and second ports of internal interface J1 and the wired charging input terminal USB_VBUS of charging switching module 500. The third and fourth ports of external interface J2 are grounded. The fifth port of external interface J2 is connected to the fifth port of internal interface J1 and the sixtieth resistor R60. The sixtieth resistor R60 is electrically connected to the nineteenth port CASE_LED1_Y of data processing module 300. The sixth port of external interface J2 is connected to the sixth port of internal interface J1 and the sixty-first resistor R61. The sixty-first resistor R61 is electrically connected to the twentieth port CASE_LED1_W of data processing module 300. The seventh and eighth ports of external interface J2 are grounded. The specific value of the sixtieth resistor R60 can be 1 kΩ, and the specific value of the sixty-first resistor R61 can be 820 Ω.

[0095] In some embodiments, during the charging process of the earphones in the charging case, the data processing module 300 controls the display module 1200 to display the battery level based on the detected battery level. Specifically, if the current battery level of the earphones is 0-40% of its full capacity, the data processing module 300 controls the second LED U_LED1_W to flash. The flashing frequency can be once every 5 seconds, once every 10 seconds, or can be set according to the specific needs of those skilled in the art. If the current battery level of the earphones is 40-90% of its full capacity, the data processing module 300 controls the second LED U_LED1_W to turn on and off at a specific frequency. For example, the on / off state of the second LED U_LED1_W can be switched every 5 seconds, i.e., the second LED U_LED1_W first stays on for 5 seconds, then turns off for 5 seconds, then stays on for 5 seconds again, and so on. If the current battery level of the headphones is 90-100% of the full battery level, the data processing module 300 will control the first LED U_LED1_Y to turn on and off at a specific frequency. For example, the on / off state of the first LED U_LED1_Y can be switched every 5 seconds. That is, the first LED U_LED1_Y will first be on for 5 seconds, then off for 5 seconds, then on for 5 seconds again, and so on.

[0096] It is understandable that the model number of display module 1200 is YLS1615 / 2Y1W / 21 / 04A-2MA-H, and the models of internal interface J1 and external interface J2 are HC503_06R_GF.

[0097] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 10In some embodiments, the charging input terminal of the voltage conversion module 800 is electrically connected to the output terminal USB_IN_5 of the charging switching module 500, the battery input terminal of the voltage conversion module 800 is electrically connected to the positive terminal BAT+ of the battery 900, and the output terminal VDD_3V0 of the voltage conversion module 800 is electrically connected to the twenty-first port VDD of the data processing module 300. The twenty-first port VDD is electrically connected to the sixteenth capacitor C16 and the thirtieth capacitor C30. The voltage conversion module 800 is used to convert the voltage output by the charging switching module 500 and the battery 900 into the operating voltage of the data processing module 300. Specifically, one end of the fifteenth resistor R15 is electrically connected to the serial clock terminal SCL and the seventh port of the data processing module 300, and the other end of the fifteenth resistor R15 is electrically connected to the output terminal VDD_3V0 of the voltage conversion module 800. One end of the seventeenth resistor R17 is electrically connected to the serial data terminal SDA and the eighth port of the data processing module 300, and the other end of the seventeenth resistor R17 is electrically connected to the output terminal VDD_3V0 of the voltage conversion module 800. One end of the eleventh resistor R11 is electrically connected to the interrupt output terminal IRQ and the tenth port C_IRQ of the data processing module 300, and the other end of the eleventh resistor R11 is electrically connected to the output terminal VDD_3V0 of the voltage conversion module 800. For example, the specific value of the eleventh resistor R11 can be 4.7 kΩ, the specific value of the fifteenth resistor R15 can be 4.7 kΩ, the specific value of the seventeenth resistor R17 can be 4.7 kΩ, the specific value of the sixteenth capacitor C16 can be 10uF / 25V, and the specific value of the thirtieth capacitor C30 can be 100nF / 50V.

[0098] Please refer to Figure 3 , Figure 4 and Figure 11The control circuit also includes a battery power detection circuit. The input of the battery power detection circuit is electrically connected to the positive terminal (BAT+) of the battery 900, and the output is electrically connected to the eleventh port (BAT-AD) of the data processing module 300. This circuit converts the voltage at the positive terminal (BAT+) of the battery 900 into a voltage detectable by the eleventh port (BAT-AD) of the data processing module 300. The data processing module 300 can then detect the real-time battery power of the battery 900 based on the voltage received from the eleventh port (BAT-AD). Specifically, the battery power detection circuit includes a twenty-third resistor (R23), a fifty-sixth resistor (R56), and a sixty-fifth capacitor (C65). The twenty-third resistor (R23) is electrically connected to the positive terminal (BAT+) of the battery 900 and the fifty-sixth resistor (R56). One end of the fifty-sixth resistor (R56) is electrically connected to the eleventh port (BAT-AD) of the data processing module 300, and the other end is grounded. The sixty-fifth capacitor (C65) and the fifty-sixth resistor (R56) are connected in parallel. The specific value of the twenty-third resistor R23 can be 330 kΩ, the specific value of the fifty-sixth resistor R56 can be 1 MΩ, and the specific value of the sixty-fifth capacitor C65 can be 100 nF / 50 V. Therefore, when the control circuit is in high-power mode, the data processing module 300 will detect the battery power level of the battery 900 through the battery power detection circuit; while when the control circuit is in low-power mode, the data processing module 300 will not detect the battery power level of the battery 900 through the battery power detection circuit.

[0099] Please refer to Figure 4 , Figure 5 , Figure 10 and Figure 12The control circuit also includes a data processing reset circuit, which is electrically connected to the output terminal USB_IN_5V of the charging switching module 500, the output terminal VDD_3V0 of the voltage conversion module 800, and the fourth port MCU_RST of the data processing module 300. The data processing reset circuit is used to reset the data processing module 300 based on the output voltage of the charging switching module 500. Specifically, the data processing reset circuit includes a 31st resistor R31, a 41st resistor R41, a 42nd resistor R42, a 162nd capacitor C162, and a 7th switch Q7. It can be understood that the 7th switch Q7 is a transistor. The output terminal USB_IN_5V of the charging switching module 500 is electrically connected to the 31st resistor R31. The 31st resistor R31 is electrically connected to the 162nd capacitor C162. The 162nd capacitor C162 is electrically connected to the base of the 7th switch Q7 and the 41st resistor R41, which is grounded. The emitter of the 7th switch Q7 is grounded, and the collector of the 7th switch Q7 is electrically connected to the 42nd resistor R42 and the fourth port MCU_RST of the data processing module 300. The 42nd resistor R42 is electrically connected to the output terminal VDD_3V0 of the voltage conversion module 800. The specific value of the 31st resistor R31 can be 1 kΩ, the specific value of the 41st resistor R41 can be 100 kΩ, the specific value of the 42nd resistor R42 can be 100 kΩ, and the specific value of the 162nd capacitor C162 can be 2.2 uF.

[0100] In some embodiments, when the control circuit of the earphone charging case is in an abnormal operating mode, the control circuit of the earphone charging case is switched from the abnormal operating mode to the normal operating mode. The abnormal operating mode refers to an operating mode of the control circuit other than a preset operating mode, including but not limited to any of the following: the earphone charging case being in an incorrect power consumption mode due to program errors, abnormal temperature, external magnetic field interference, or power fluctuations. The normal operating mode refers to the control circuit being in a preset operating mode. Furthermore, when the control circuit is in a low-power mode, the data processing module 300 can detect the adapter voltage through the data processing reset circuit, and then control the earphone charging case to switch from a low-power mode to a high-power mode based on the adapter voltage.

[0101] Please refer to Figure 3 , Figure 4 and Figure 13In some embodiments, the control circuit further includes a communication control circuit electrically connected to the left load detection terminal VOL, the right load detection terminal VOR, and the data processing module 300. Therefore, the data processing module 300 can initiate or deactivate communication with the left earphone via the communication control circuit and the left ear load detection circuit, and similarly, it can initiate or deactivate communication with the right earphone via the communication control circuit and the right ear load detection circuit. Specifically, the communication control circuit includes resistors R72 (72nd), R73 (73rd), R74 (74th), and R75 (75th), switch Q9 (9th), switch Q10 (10th), and diode D11. It is understood that switches Q9 and Q10 are 2N7002 NMOS transistors, diode D11 is RB521S-30, and the specific values ​​of resistors R72, R73, R74, and R75 can all be 100 ohms, 10,000 ohms, and 10,000 ohms respectively. Specifically, the right load detection terminal VOR is electrically connected to the 72nd resistor R72, which is electrically connected to the drain of the 9th switch Q9. The source of the 9th switch Q9 is electrically connected to the first port TX / RX_R of the data processing module 300 and the 81st resistor R81. The 81st resistor R81 is electrically connected to the 24th port of the data processing module 300. The 74th resistor R74 is electrically connected to the base and source of the 9th switch Q9. The left load detection terminal VOL is electrically connected to the 73rd resistor R73, which is electrically connected to the drain of the 10th switch Q10. The source of the 10th switch Q10 is electrically connected to the 17th port TX / RX_L of the data processing module 300 and the 37th resistor R37. The 37th resistor R37 is electrically connected to the 16th port of the data processing module 300. The 75th resistor R75 is electrically connected to the base and source of the 10th switch Q10. The 23rd port TDI / COM_C of the data processing module 300 is electrically connected to the positive terminal of diode D11. The negative terminal of diode D11 is electrically connected to the 74th resistor R74, the 75th resistor R75, the base of the 9th switch Q9, and the base of the 10th switch Q10.

[0102] In other embodiments, the eighty-first resistor R81 may have a specific value of 0 ohms, meaning that the source of the ninth switch Q9 is electrically connected to the first port TX / RX_R of the data processing module 300 and the twenty-fourth port of the data processing module 300. Similarly, the thirty-seventh resistor R37 may have a specific value of 0 ohms, meaning that the source of the tenth switch Q10 is electrically connected to the seventeenth port TX / RX_L of the data processing module 300 and the sixteenth port of the data processing module 300.

[0103] This application also provides an earphone charging case, which includes the control circuit of the earphone charging case.

[0104] The control circuit and charging case of the earphones provided in this application embodiment are configured with a data processing module, a charging control chip, and an earphone load detection module in the control circuit. The earphone load detection module is detachably connected to the earphones through its input terminal and electrically connected to the charging control chip through its output terminal. This allows the earphone load detection module to obtain the earphone load current by detecting the current generated by the load changes brought by the earphones and output the earphone load current to the charging control chip. Then, the charging control chip generates an interrupt signal based on the earphone load current and sends the interrupt signal to the data processing module. Finally, the data processing module generates a control signal based on the interrupt signal and controls the earphone charging case to enter either a low-power mode or a high-power mode according to the control signal. Therefore, the control circuit and charging case of the earphone charging case shown in this application embodiment, by setting a data processing module, a charging control chip, and an earphone load detection module, enable the control circuit of the earphone charging case to obtain the earphone load current by detecting the current formed by the load change brought by the earphone, and control the power consumption mode of the earphone charging case according to the load current. This eliminates the need for the control circuit of the earphone charging case to rely on Hall elements for power consumption mode control, reduces the impact of factors such as temperature changes and external magnetic field interference on Hall elements and power consumption mode control of the earphone charging case, and improves the accuracy of power consumption mode control by the control circuit of the earphone charging case.

[0105] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0106] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0107] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0108] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0109] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0110] In the several embodiments provided in this application, it should be understood that the disclosed devices and circuits can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0111] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0112] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0113] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0114] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A control circuit for an earphone charging case, characterized in that, The control circuit includes: a data processing module, a charging control chip, and an earphone load detection module; The input terminal of the headphone load detection module can be detachably connected to the headphone, and the output terminal of the headphone load detection module is electrically connected to the charging control chip. The headphone load detection module is used to detect the current formed by the load change brought by the headphone to obtain the headphone load current, and output the headphone load current to the charging control chip. The charging control chip generates an interrupt signal based on the headphone load current and sends the interrupt signal to the data processing module. The data processing module generates a control signal based on the interrupt signal, and controls the earphone charging case to enter a low-power mode or a high-power mode according to the control signal.

2. The control circuit for an earphone charging case according to claim 1, characterized in that, The headphone load current includes the load current of the left headphone and the load current of the right headphone. The headphone includes a left headphone and a right headphone. The headphone load detection module includes: The left ear load detection circuit is used to detect the current formed by the load change brought by the left earphone to obtain the load current of the left earphone. The input terminal of the left ear load detection circuit is detachably connected to the left earphone, and the output terminal of the left ear load detection circuit is electrically connected to the charging control chip. The right ear load detection circuit is used to detect the current formed by the load change brought by the right earphone to obtain the load current of the right earphone. The input terminal of the right ear load detection circuit is detachably connected to the right earphone, and the output terminal of the right ear load detection circuit is electrically connected to the charging control chip.

3. The control circuit for an earphone charging case according to claim 2, characterized in that, The left ear load detection circuit includes: a left positive spring pin, a second electrostatic discharge protection device, and a left negative spring pin connected in sequence. The left earphone power terminal of the charging control chip is electrically connected to the left positive spring pin and the second electrostatic discharge protection device. The second electrostatic discharge protection device and the left negative spring pin are grounded.

4. The control circuit for an earphone charging case according to claim 3, characterized in that, The right ear load detection circuit includes: a right positive spring pin, a third electrostatic discharge protection device, and a right negative spring pin connected in sequence. The right earphone power terminal of the charging control chip is electrically connected to the right positive spring pin and the third electrostatic discharge protection device. The third electrostatic discharge protection device and the right negative spring pin are grounded.

5. The control circuit for an earphone charging case according to claim 1, characterized in that, The control circuit also includes: a charging module, a charging switching module, an input voltage detection module, and a charging current control module; The charging switching module is electrically connected to the charging module, the data processing module and the charging control chip. The charging switching module is used to output wireless charging voltage to the data processing module. The input voltage detection module is electrically connected to the charging switching module, the adapter input terminal of the charging control chip, and the data processing module. The input voltage detection module is used to output the adapter voltage to the data processing module. The charging current control module is electrically connected to the data processing module and the charging control chip; The data processing module determines the charging mode of the control circuit of the earphone charging case based on the wireless charging voltage and the adapter voltage, and outputs a segmented current control signal according to the charging mode. The charging current control module sets the charging current of the earphones according to the current segmentation control signal output by the data processing module.

6. The control circuit for an earphone charging case according to claim 5, characterized in that, The charging current control module includes: a fifth NMOS transistor, a tenth resistor, a sixteenth resistor, a thirty-fifth resistor, a fourteenth resistor, and a sixty-seventh capacitor; The source of the fifth NMOS transistor is grounded, the gate of the fifth NMOS transistor is electrically connected to the tenth resistor, the tenth resistor is grounded, and the sixth port of the data processing module is electrically connected to the gate of the fifth NMOS transistor and the tenth resistor. The sixteenth resistor is electrically connected to the drain of the fifth NMOS transistor and the thirty-fifth resistor, and the thirty-fifth resistor is electrically connected to the charging current setting terminal of the charging control chip. One end of the fourteenth resistor is connected to the charging current setting terminal, and the other end of the fourteenth resistor is grounded. One end of the sixty-seventh capacitor is electrically connected to the sixteenth resistor and the thirty-fifth resistor, and the other end of the sixty-seventh capacitor is grounded.

7. The control circuit for an earphone charging case according to claim 6, characterized in that, The input voltage detection module includes: a twentieth resistor and a twenty-second resistor; The adapter input terminal of the charging control chip and the charging switching module are electrically connected to the 22nd resistor, the 22nd resistor is electrically connected to the 20th resistor, and the 20th resistor is grounded. The fourteenth port of the data processing module is electrically connected to the twentieth resistor and the twenty-second resistor.

8. The control circuit for an earphone charging case according to claim 6, characterized in that, The control circuit further includes: a data processing reset circuit; The data processing reset circuit is electrically connected to the charging switching module and the data processing module; When the control circuit of the earphone charging case is in the low-power mode, the data processing module detects the adapter voltage through the data processing reset circuit, and controls the control circuit of the earphone charging case to switch from the low-power mode to the high-power mode according to the adapter voltage.

9. The control circuit for an earphone charging case according to claim 1, characterized in that, The control circuit also includes: a battery and a battery access circuit; The battery access circuit includes: a third inductor, a seventieth capacitor, and a seventy-second capacitor; The switch output terminal of the charging control chip is electrically connected to the third inductor, and the third inductor is electrically connected to the positive terminal of the battery; The positive input terminal of the charging control chip is electrically connected to the positive terminal of the battery. One end of the seventieth capacitor is electrically connected to the positive terminal of the battery and the third inductor, and the other end of the seventieth capacitor is grounded; The seventy-second capacitor and the seventieth capacitor are connected in parallel.

10. An earphone charging case, characterized in that, The earphone charging case includes the control circuit according to any one of claims 1 to 9.

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