Charging box circuit, charging box and earphone equipment

Abstract

The utility model brings forward a charging box circuit, a charging box and an earphone device, the charging box circuit comprises a first contact, a charging circuit, a controller and a communication switch circuit, the first contact is connected with a second contact of an earphone, the controller respectively outputs a charging control signal and a communication control signal, and the communication switch circuit is connected with the charging circuit. The charging control signal is used for controlling the charging circuit to charge the earphone, the communication control signal is used for controlling the communication switch circuit to be switched on, and when the communication switch circuit is switched on, the controller can communicate with the earphone through the communication switch circuit and the first contact, so that charging and communication between the charging box and the earphone are realized. And communication switching can be realized by adopting one communication switch circuit, so that the structure of the charging box is simplified, and the design cost of the charging box is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of charging box technology, and in particular relates to a charging box circuit, a charging box, and an earphone device. Background Technology

[0002] Headphone devices typically consist of earbuds and a charging case. When not in use, the earbuds are placed in the charging case and connected via contacts for charging and communication. There are various communication methods between the earbuds and the charging case, including power line communication and electromagnetic communication.

[0003] Conventional communication methods require additional carrier circuits, electromagnetic conversion circuits, and other structures to be added to the charging case and earphones, which increases costs. Utility Model Content

[0004] The purpose of this invention is to provide a charging case circuit that addresses the high cost of communication between traditional earphones and charging cases.

[0005] A first aspect of this utility model provides a charging box circuit, comprising:

[0006] The first contact is used to connect to the second contact of the earphone for charging or communication.

[0007] A charging circuit is connected to the first contact, and the charging circuit outputs charging power to the first contact in response to a charging control signal.

[0008] A controller, wherein the first control terminal of the controller is connected to the control terminal of the charging circuit, and the controller is used to output the charging control signal and the communication control signal respectively;

[0009] A communication switch circuit, wherein a first terminal of the communication switch circuit is connected to the first contact, a second terminal of the communication switch circuit is connected to the communication signal terminal of the controller, a control terminal of the communication switch circuit is connected to the second control terminal of the controller, and the communication switch circuit is triggered to conduct by the communication control signal.

[0010] Optionally, the first contact includes a first sub-contact and a second sub-contact;

[0011] The communication switch circuit includes:

[0012] A first switching circuit, wherein a first terminal of the first switching circuit is connected to the first sub-contact, a second terminal of the first switching circuit is connected to the first communication signal terminal of the controller, a control terminal of the first switching circuit is connected to the second control terminal of the controller, and the first switching circuit is triggered to conduct by the communication control signal;

[0013] The second switching circuit has a first terminal connected to the second sub-contact, a second terminal connected to the second communication signal terminal of the controller, and a control terminal connected to the second control terminal of the controller. The second switching circuit is triggered to conduct by the communication control signal.

[0014] Optionally, the first switching circuit includes a first resistor, a second resistor, and a first electronic switch transistor;

[0015] The first end of the first resistor constitutes the first end of the first switching circuit. The second end of the first resistor is connected to the first end of the first electronic switch. The second end of the first electronic switch and the first end of the second resistor are connected to form the second end of the first switching circuit. The control end of the first electronic switch and the second end of the second resistor are connected to form the control end of the first switching circuit.

[0016] Optionally, the second switching circuit includes a third resistor, a fourth resistor, and a second electronic switch.

[0017] The first end of the third resistor constitutes the first end of the second switching circuit. The second end of the third resistor is connected to the first end of the second electronic switch. The second end of the second electronic switch and the first end of the fourth resistor are connected to constitute the second end of the second switching circuit. The control end of the second electronic switch and the second end of the fourth resistor are connected to constitute the control end of the second switching circuit.

[0018] Optionally, the charging box circuit further includes:

[0019] A unidirectional conduction circuit, wherein the input terminal of the unidirectional conduction circuit is connected to the second control terminal of the controller, and the output terminal of the unidirectional conduction circuit is connected to the control terminal of the communication switch circuit.

[0020] Optionally, the unidirectional conduction circuit includes a diode;

[0021] The anode of the diode forms the input terminal of the unidirectional conduction circuit, and the cathode of the diode forms the output terminal of the unidirectional conduction circuit.

[0022] Optionally, the charging circuit includes a battery and a charging chip;

[0023] The charging chip is connected to the battery, the controller, and the first contact, respectively.

[0024] Optionally, the charging box circuit further includes a push-button switch, which is connected to the signal terminal of the controller.

[0025] A second aspect of this utility model provides a charging box, including a housing and a charging box circuit as described above, wherein the charging box circuit is disposed within the housing.

[0026] A third aspect of this utility model provides an earphone device, including earphones and a charging case as described above.

[0027] The beneficial effects of this utility model embodiment compared with the prior art are as follows: The charging case circuit mentioned above includes a first contact, a charging circuit, a controller, and a communication switch circuit. The first contact is connected to the second contact of the earphone. The controller outputs a charging control signal and a communication control signal respectively. The charging control signal is used to control the charging circuit to charge the earphone, and the communication control signal is used to control the communication switch circuit to be turned on. When the communication switch circuit is turned on, the controller can communicate with the earphone through the communication switch circuit, the first contact, and the communication switch circuit, thereby realizing the charging and communication work between the charging case and the earphone. Furthermore, communication switching can be achieved by using a single communication switch circuit, which simplifies the structure of the charging case and reduces the design cost of the charging case. Attached Figure Description

[0028] Figure 1 A schematic diagram of the first structure of the charging box circuit provided in this embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram of a second structure of the charging box circuit provided in an embodiment of the present utility model;

[0030] Figure 3 A first circuit diagram of the charging box circuit provided in this embodiment of the utility model;

[0031] Figure 4 A schematic diagram of a third structure of the charging box circuit provided in an embodiment of this utility model;

[0032] Figure 5 A second circuit diagram of the charging box circuit provided in this embodiment of the utility model;

[0033] Figure 6 A fourth structural schematic diagram of the charging box circuit provided in this embodiment of the utility model;

[0034] Figure 7 A fifth structural schematic diagram of the charging box circuit provided in this embodiment of the utility model;

[0035] Figure 8 A schematic diagram of the charging case and earphone device provided in an embodiment of this utility model. Detailed Implementation

[0036] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] The first aspect of this utility model provides a charging case circuit 100. The charging case circuit 100 is disposed in a charging case and is compatible with an earphone 200. When the earphone 200 is not in use, it is placed in the accommodating space of the charging case. The charging case is provided with contacts in the accommodating space. The contacts are connected to the contacts of the earphone 200 to realize charging or communication. The earphone 200 is provided with a corresponding Bluetooth chip, control module, battery module, etc. The Bluetooth chip is used for compatibility and connection with other Bluetooth devices. The control module is used for communication with the charging case through the contacts of the earphone 200. The battery module is charged and stores power through the contacts of the earphone 200 and the charging case. The control module can also be used to control the start / stop and working status of the Bluetooth chip and the battery module.

[0039] To simplify the communication structure between the charging case and the earphones 200, in an optional embodiment, such as Figure 1 As shown, the charging case circuit 100 includes:

[0040] The first contact P1 is used to connect to the second contact P2 of the earphone 200 for charging or communication.

[0041] Charging circuit 10 is connected to the first contact P1. Charging circuit 10 outputs charging power to the first contact P1 in response to charging control signal Ctr1.

[0042] Controller 20, the first control terminal of controller 20 is connected to the control terminal of charging circuit 10, and controller 20 is used to output charging control signal Ctr1 and communication control signal Ctr2 respectively;

[0043] The communication switch circuit 30 has a first end connected to the first contact P1, a second end connected to the communication signal terminal of the controller 20, and a control terminal connected to the second control terminal of the controller 20. The communication switch circuit 30 is triggered to conduct by the communication control signal Ctr2.

[0044] In this embodiment, the controller 20 controls the operating states of the charging circuit 10 and the communication switch circuit 30 respectively. When the charging case and the earphone 200 switch to communication mode, the controller 20 outputs a communication control signal Ctr2 to the communication switch circuit 30 and cuts off the output of the charging control signal Ctr1. The charging circuit 10 stops working, and the communication switch circuit 30 is triggered to conduct. The communication signal terminal of the controller 20 is connected through the communication switch circuit 30, the first contact P1, and the second contact P2 of the earphone 200. Communication is also achieved through the second contact P2 of the earphone 200 with the control module of the earphone 200, and relevant data information is exchanged. The controller 20 can obtain information such as the operating status and battery level of the earphone 200. Thus, the charging case and the earphone 200 can be charged and communicated. Furthermore, communication switching can be achieved using only a communication switch circuit 30, eliminating the need for additional carrier circuits, electromagnetic conversion circuits, and other structures, simplifying the structure of the charging case and reducing its design cost.

[0045] When the charging case and earphones 200 switch to charging mode, the controller 20 outputs a charging control signal Ctr1 to the charging circuit 10 and cuts off the output communication control signal Ctr2. At this time, the communication switch circuit 30 is triggered to turn off, and the charging circuit 10 is triggered to start. The charging circuit 10 discharges to the first contact P1 and outputs charging power to the battery module of the earphones 200 through the first contact P1 and the second contact P2 to charge the battery module.

[0046] The charging circuit 10 can employ a corresponding charging chip, buck-boost circuit, etc. In an optional embodiment, such as... Figure 6 As shown, the charging circuit 10 includes a battery 11 and a charging chip 12, which is connected to the battery 11, the controller 20 and the first contact P1 respectively.

[0047] Battery 11 is used to output power to charging chip 12. When the charging case and earphone 200 switch to charging mode, controller 20 outputs charging control signal Ctr1 to charging chip 12 and cuts off communication control signal Ctr2. At this time, communication switch circuit 30 is triggered to turn off and charging chip 12 is triggered to start. Charging chip 12 performs step-up and step-down conversion, voltage regulation and other processing on the power supply and outputs power supply. The power supply is output to the battery module of earphone 200 through first contact P1 and second contact P2 and charges the battery module.

[0048] When the charging case and earphone 200 switch to communication mode, the controller 20 outputs a communication control signal Ctr2 to the communication switch circuit 30 and cuts off the output of the charging control signal Ctr1. The charging chip 12 is turned off, and there is no charging power output. The communication switch circuit 30 is triggered to conduct. The communication signal terminal of the controller 20 is connected through the communication switch circuit 30, the first contact P1 and the second contact P2 of the earphone 200, and communicates with the control module of the earphone 200 through the second contact P2 of the earphone 200 to achieve communication and exchange relevant data information.

[0049] The number of first contacts P1 can be set according to the number of earphones 200. Correspondingly, the communication switch circuit 30 can be equipped with one or more switches.

[0050] In an alternative embodiment, such as Figure 2 As shown, the earphone 200 includes a first earphone 210 and a second earphone 220, which are the left and right earphones, respectively. To enable separate charging and communication for the first earphone 210 and the second earphone 220, the first contact P1 includes a first sub-contact P11 and a second sub-contact P12, and the second contact P2 includes a third sub-contact P21 disposed on the first earphone 210 and a fourth sub-contact P22 disposed on the second earphone 220. When the earphone 200 is placed in the charging case, the first sub-contact P11 abuts against the third sub-contact P21 of the first earphone 210, and the second sub-contact P12 abuts against the fourth sub-contact P22 of the second earphone 220. The third sub-contact P21 is connected to the corresponding battery module, control module, and other modules in the first earphone 210, and the fourth sub-contact P22 is connected to the corresponding battery module, control module, and other modules in the second earphone 220.

[0051] Correspondingly, the communication switch circuit 30 includes:

[0052] The first switch circuit 31 has a first terminal connected to the first sub-contact P11, a second terminal connected to the first communication signal terminal IO1 of the controller 20, and a control terminal connected to the second control terminal of the controller 20. The first switch circuit 31 is triggered to conduct by the communication control signal Ctr2.

[0053] The second switch circuit 32 has its first end connected to the second sub-contact P12, its second end connected to the second communication signal terminal IO2 of the controller 20, and its control terminal connected to the second control terminal of the controller 20. The second switch circuit 32 is triggered to conduct by the communication control signal Ctr2.

[0054] In this embodiment, the controller 20 controls the working state of the first switch circuit 31 and the second switch circuit 32 of the charging circuit 10 and the communication switch circuit 30, respectively.

[0055] The power supply terminal of the charging circuit 10 is connected to the first sub-contact P11 and the second sub-contact P12, respectively.

[0056] When the charging case and earphone 200 switch to communication mode, the controller 20 outputs a communication control signal Ctr2 to the first switch circuit 31 and the second switch circuit 32, and cuts off the output of the charging control signal Ctr1. The charging circuit 10 stops working and there is no charging power output. The first switch circuit 31 and the second switch circuit 32 are triggered to conduct. The first communication signal terminal IO1 of the controller 20 is connected through the first switch circuit 31, the first sub-contact P11 and the third sub-contact P21 of the first earphone 210, and communicates with the control module of the first earphone 210 through the third sub-contact P21 of the first earphone 210 to exchange relevant data information. The second communication signal terminal IO2 of the controller 20 is connected through the second switch circuit 32, the second sub-contact P12 and the fourth sub-contact P22 of the second earphone 220, and communicates with the control module of the second earphone 220 through the fourth sub-contact P22 of the second earphone 220 to exchange relevant data information. The controller 20 can obtain information such as the working status and battery level of the first earphone 210 and the second earphone 220.

[0057] When the charging case and earphones 200 switch to charging mode, the controller 20 outputs a charging control signal Ctr1 to the charging circuit 10 and a communication control signal Ctr2 to cut off. At this time, the first switch circuit 31 and the second switch circuit 32 are triggered to turn off, and the charging circuit 10 is triggered to start. The charging circuit 10 discharges to the first sub-contact P11 and the second sub-contact P12, and outputs charging power to the battery module of the first earphone 210 through the first sub-contact P11 and the third sub-contact P21, and outputs charging power to the battery module of the second earphone 220 through the second sub-contact P12 and the fourth sub-contact P22, thus charging the battery modules of the first earphone 210 and the second earphone 220.

[0058] The switching circuit can employ switching devices or switching modules with controlled on / off states. In one optional embodiment, such as... Figure 3 As shown, the first switching circuit 31 includes a first resistor R1, a second resistor R2, and a first electronic switch Q1;

[0059] The first end of the first resistor R1 forms the first end of the first switching circuit 31. The second end of the first resistor R1 is connected to the first end of the first electronic switch Q1. The second end of the first electronic switch Q1 and the first end of the second resistor R2 are connected to form the second end of the first switching circuit 31. The control end of the first electronic switch Q1 and the second end of the second resistor R2 are connected to form the control end of the first switching circuit 31.

[0060] The second switching circuit 32 includes a third resistor R3, a fourth resistor R4, and a second electronic switch Q2;

[0061] The first end of the third resistor R3 forms the first end of the second switch circuit 32. The second end of the third resistor R3 is connected to the first end of the second electronic switch Q2. The second end of the second electronic switch Q2 and the first end of the fourth resistor R4 are connected to form the second end of the second switch circuit 32. The control end of the second electronic switch Q2 and the second end of the fourth resistor R4 are connected to form the control end of the second switch circuit 32.

[0062] In this embodiment, when the charging case and earphone 200 switch to communication mode, the controller 20 outputs a first-level communication control signal Ctr2 to the first electronic switch Q1 and the second electronic switch Q2, and cuts off the output of the charging control signal Ctr1. The charging circuit 10 stops working, and there is no charging power output. After receiving the first level, the first electronic switch Q1 and the second electronic switch Q2 are triggered to conduct. The first communication signal terminal IO1 of the controller 20 is connected through the first electronic switch Q1, the first resistor R1, the first sub-contact P11, and the third sub-contact P21 of the first earphone 210. Communication between the charging case and the earphone 200 is achieved through the third sub-contact P21 of the first earphone 210, which connects to the control module of the first earphone 210 and exchanges relevant data information. Similarly, the second communication signal terminal IO2 of the controller 20 is connected through the second electronic switch Q2, the third resistor R3, the second sub-contact P12, and the fourth sub-contact P22 of the second earphone 220, and also communicates with the control module of the second earphone 220 through the fourth sub-contact P22, exchanging relevant data information. The controller 20 can obtain information such as the operating status and battery level of the first and second earphones 210 and 220. This enables charging and communication between the charging case and the earphone 200. Furthermore, communication switching is achieved using only four resistors and two electronic switches, eliminating the need for additional carrier circuits, electromagnetic conversion circuits, and other structures, thus simplifying the charging case structure and reducing design costs.

[0063] When the charging case and earphones 200 switch to charging mode, the controller 20 outputs a charging control signal Ctr1 to the charging circuit 10, and outputs a second level to the first electronic switch Q1 and the second electronic switch Q2. At this time, the first electronic switch Q1 and the second electronic switch Q2 are triggered to turn off, and the charging circuit 10 is triggered to start. The charging circuit 10 discharges to the first sub-contact P11 and the second sub-contact P12, and outputs charging power to the battery module of the first earphone 210 through the first sub-contact P11 and the third sub-contact P21, and outputs charging power to the battery module of the second earphone 220 through the second sub-contact P12 and the fourth sub-contact P22, thus charging the battery modules of the first earphone 210 and the second earphone 220.

[0064] The first level and the second level are high and low levels respectively, and their specific level types can be determined according to the types of the first electronic switch Q1 and the second electronic switch Q2.

[0065] The first electronic switch Q1 and the second electronic switch Q2 can be appropriate switching transistors, such as MOSFETs or transistors. In an optional embodiment, the first electronic switch Q1 and the second electronic switch Q2 are NMOS transistors. When the charging case and the earphone 200 switch to communication mode, the controller 20 outputs a high level to control the first electronic switch Q1 and the second electronic switch Q2 to turn on. When the charging case and the earphone 200 switch to charging mode, the controller 20 outputs a low level to control the first electronic switch Q1 and the second electronic switch Q2 to turn off.

[0066] Furthermore, to prevent the control terminal of the communication switch circuit 30 from being output in reverse to the controller 20, in an optional embodiment, such as... Figure 4 As shown, the charging case circuit 100 also includes:

[0067] The unidirectional conduction circuit 40 has its input terminal connected to the second control terminal of the controller 20 and its output terminal connected to the control terminal of the communication switch circuit 30. The unidirectional conduction circuit 40 is used to transmit the communication control signal Ctr2 to the communication switch circuit 30 in one direction and cut off the reverse level to prevent the level of the control terminal of the communication switch circuit 30 from being output in reverse to the controller 20, thereby improving the working stability of the controller 20.

[0068] The unidirectional conduction circuit 40 can adopt structures such as optocouplers and diodes D1. In an optional embodiment, for example... Figure 5 As shown, in order to simplify the circuit structure of the charging box circuit 100, the unidirectional conduction circuit 40 includes a diode D1;

[0069] The anode of diode D1 forms the input terminal of the unidirectional conduction circuit 40, and the cathode of diode D1 forms the output terminal of the unidirectional conduction circuit 40. The communication control signal Ctr2 output by controller 20 can be transmitted unidirectionally to the control terminal of communication switch circuit 30 and achieve reverse cutoff to prevent the level of the control terminal of communication switch circuit 30 from flowing back.

[0070] Furthermore, in order to achieve control over the operating state of the charging case, in an optional embodiment, such as... Figure 7 As shown, the charging box circuit 100 also includes a push-button switch 50, which is connected to the signal terminal of the controller 20. The controller 20 can control the working state of the charging circuit 10 and the communication switch circuit 30 according to the status information such as the number of times the push-button switch 50 is pressed and the duration. For example, if the controller detects that the push-button switch 50 is pressed for a long time, the controller 20 can control the charging circuit 10 and the communication switch circuit 30 to be turned off at the same time, thereby realizing the power-off operation of the charging box circuit 100.

[0071] The beneficial effects of this utility model embodiment compared with the prior art are as follows: The charging box circuit 100 includes a first contact P1, a charging circuit 10, a controller 20, and a communication switch circuit 30. The first contact P1 is connected to the second contact P2 of the earphone 200. The controller 20 outputs a charging control signal Ctr1 and a communication control signal Ctr2 respectively. The charging control signal Ctr1 is used to control the charging circuit 10 to charge the earphone 200, and the communication control signal Ctr2 is used to control the communication switch circuit 30 to be turned on. When the communication switch circuit 30 is turned on, the controller 20 can communicate with the earphone 200 through the communication switch circuit 30, the first contact P1, and the communication switch circuit 30, thereby realizing the charging and communication work between the charging box and the earphone 200. Furthermore, communication switching can be achieved by using only one communication switch circuit 30, which simplifies the structure of the charging box and reduces the design cost of the charging box.

[0072] This utility model also proposes a charging box, such as Figure 8As shown, the charging case includes a housing 300 and a charging case circuit 100. The specific structure of the charging case circuit 100 is as described in the above embodiments. Since this charging case adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described in detail here. The charging case circuit 100 is disposed within the housing 300, which has an accommodating space. The charging case is compatible with the earphones 200. When not in use, the earphones 200 are placed in the accommodating space of the charging case. The charging case has contacts within the accommodating space, which connect with the contacts of the earphones 200 to achieve charging or communication. The earphones 200 contain a corresponding Bluetooth chip, control module, battery module, etc. The Bluetooth chip is used for compatibility and connection with other Bluetooth devices. The control module is used for communication with the charging case through the contacts of the earphones 200. The battery module is used for charging and storing power through the contacts of the earphones 200. The control module can also be used to control the start / stop and working status of the Bluetooth chip and the battery module.

[0073] The housing 300 includes an upper cover 310 and a lower cover 320, which are adapted to each other and can be opened and closed.

[0074] This utility model also proposes an earphone device, such as... Figure 8 As shown, the headphone device includes earphones 200 and a charging case. The specific structure of the charging case is as described in the above embodiments. Since this headphone device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0075] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A charging box circuit, characterized in that, include: The first contact is used to connect to the second contact of the earphone for charging or communication. A charging circuit is connected to the first contact, and the charging circuit outputs charging power to the first contact in response to a charging control signal. A controller, wherein the first control terminal of the controller is connected to the control terminal of the charging circuit, and the controller is used to output the charging control signal and the communication control signal respectively; A communication switch circuit, wherein a first terminal of the communication switch circuit is connected to the first contact, a second terminal of the communication switch circuit is connected to the communication signal terminal of the controller, a control terminal of the communication switch circuit is connected to the second control terminal of the controller, and the communication switch circuit is triggered to conduct by the communication control signal.

2. The charging box circuit as described in claim 1, characterized in that, The first contact includes a first sub-contact and a second sub-contact; The communication switch circuit includes: A first switching circuit, wherein a first terminal of the first switching circuit is connected to the first sub-contact, a second terminal of the first switching circuit is connected to the first communication signal terminal of the controller, a control terminal of the first switching circuit is connected to the second control terminal of the controller, and the first switching circuit is triggered to conduct by the communication control signal; The second switching circuit has a first terminal connected to the second sub-contact, a second terminal connected to the second communication signal terminal of the controller, and a control terminal connected to the second control terminal of the controller. The second switching circuit is triggered to conduct by the communication control signal.

3. The charging box circuit as described in claim 2, characterized in that, The first switching circuit includes a first resistor, a second resistor, and a first electronic switch transistor; The first end of the first resistor constitutes the first end of the first switching circuit. The second end of the first resistor is connected to the first end of the first electronic switch. The second end of the first electronic switch and the first end of the second resistor are connected to form the second end of the first switching circuit. The control end of the first electronic switch and the second end of the second resistor are connected to form the control end of the first switching circuit.

4. The charging box circuit as described in claim 2, characterized in that, The second switching circuit includes a third resistor, a fourth resistor, and a second electronic switch. The first end of the third resistor constitutes the first end of the second switching circuit. The second end of the third resistor is connected to the first end of the second electronic switch. The second end of the second electronic switch and the first end of the fourth resistor are connected to constitute the second end of the second switching circuit. The control end of the second electronic switch and the second end of the fourth resistor are connected to constitute the control end of the second switching circuit.

5. The charging box circuit as described in any one of claims 1 to 4, characterized in that, The charging box circuit also includes: A unidirectional conduction circuit, wherein the input terminal of the unidirectional conduction circuit is connected to the second control terminal of the controller, and the output terminal of the unidirectional conduction circuit is connected to the control terminal of the communication switch circuit.

6. The charging box circuit as described in claim 5, characterized in that, The unidirectional conduction circuit includes a diode; The anode of the diode forms the input terminal of the unidirectional conduction circuit, and the cathode of the diode forms the output terminal of the unidirectional conduction circuit.

7. The charging box circuit as described in any one of claims 1 to 4, characterized in that, The charging circuit includes a battery and a charging chip; The charging chip is connected to the battery, the controller, and the first contact, respectively.

8. The charging box circuit as described in any one of claims 1 to 4, characterized in that, The charging box circuit also includes a push-button switch, which is connected to the signal terminal of the controller.

9. A charging case, characterized in that, It includes a housing and a charging box circuit as described in any one of claims 1 to 8, wherein the charging box circuit is disposed within the housing.

10. A headphone device, characterized in that, Includes earphones and the charging case as described in claim 9.

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