Single-wire two-way communication circuit for Bluetooth earphone and charging box

Abstract

The utility model provides a single-line two-way communication circuit for a Bluetooth earphone and a charging box, which comprises a charging box communication circuit and a Bluetooth earphone communication circuit, the input end of the charging box communication circuit is connected with a charging box control chip, and a charging box built-in power supply is in power supply connection with the charging box communication circuit and the charging box control chip. The output end of the charging box communication circuit is connected with the input end of the Bluetooth headset communication circuit, the output end of the Bluetooth headset communication circuit can be in charging connection with a Bluetooth headset power supply, the input end of the Bluetooth headset communication circuit is further connected with the Bluetooth headset control chip, and the charging box communication circuit is in communication connection with the Bluetooth headset communication circuit. The Bluetooth headset communication circuit can disconnect the charging connection with the Bluetooth headset power supply according to the information fed back by the Bluetooth headset control chip when the Bluetooth headset is fully charged. The beneficial effects of the utility model are that the communication function between the Bluetooth earphone and the charging box during charging and the function of automatically stopping charging after the charging box is fully charged can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, and particularly relates to a single-wire bidirectional communication circuit for a Bluetooth headset and a charging case. Background Art

[0002] A Bluetooth headset is a small device based on Bluetooth technology. By simply hiding this lightweight device near the ear, free calls can be made without directly using communication devices (such as mobile phones, computers, etc.). The Bluetooth headset applies Bluetooth technology to hands-free headsets, allowing users to get rid of the annoyance of wires and make calls easily in various ways. Since the advent of Bluetooth headsets, they have always been a good tool for mobile business people to improve efficiency. However, due to the lack of wire troubles, the internal power supply of Bluetooth headsets often needs to be charged to ensure the normal use of Bluetooth headsets.

[0003] A Bluetooth headset charging case is an essential portable device for Bluetooth headsets, mainly used for storing, protecting, and charging Bluetooth headsets. The Bluetooth headset charging case usually contains one or more charging slots for placing and charging Bluetooth headsets. It usually has a mobile power supply (also known as an internal battery or charging case battery) inside, which can be charged through a USB cable or other charging methods. When the Bluetooth headset is placed in the charging slot, it will connect to the contact points inside the charging case, and then start charging. The charging case not only provides a charging function but also can be used as a portable storage case for Bluetooth headsets to protect the headsets from damage.

[0004] In the prior art, the conventional charging of Bluetooth headsets and charging cases is generally 5V charging without communication. Although the prior art design is simple, in the existing charging technology, when the Bluetooth headset is fully charged in the charging case, the charging case still has voltage output. After the Bluetooth headset is fully charged, the charging case cannot enter the sleep state, which will waste a lot of power of the charging case, reduce the service time and service life of the charging case, and there is no way to interact information between the charging case and the Bluetooth headset, making it impossible for users to better understand the status of the charging case and the Bluetooth headset, resulting in a poor user experience. Content of the Utility Model

[0005] To solve the problems in the prior art, the present utility model provides a single-wire bidirectional communication circuit for a Bluetooth headset and a charging case. By arranging a charging case communication circuit and a Bluetooth headset communication circuit that cooperate with each other in the single-wire bidirectional communication circuit for the Bluetooth headset and the charging case, the Bluetooth headset communication circuit can disconnect the charging connection with the power supply of the Bluetooth headset according to the information fed back by the Bluetooth headset control chip when the Bluetooth headset is fully charged, can realize the communication function between the Bluetooth headset and the charging case during charging, can realize that the charging automatically stops when the Bluetooth headset is fully charged and the charging case automatically enters the sleep state, improves the power utilization rate of the charging case, increases the usage time and service life of the charging case, enables the user to better understand the states of the charging case and the Bluetooth headset, greatly improves the user experience, and solves the problems in the prior art that there is no communication function between the Bluetooth headset and the charging case and the charging case cannot automatically enter the sleep state after the Bluetooth headset is fully charged.

[0006] A single-wire bidirectional communication circuit for a Bluetooth headset and a charging case provided by the present utility model includes a charging case communication circuit and a Bluetooth headset communication circuit. The input end of the charging case communication circuit is connected to the charging case control chip, the built-in power supply of the charging case is electrically connected to the charging case communication circuit and the charging case control chip, the output end of the charging case communication circuit is connected to the input end of the Bluetooth headset communication circuit, the output end of the Bluetooth headset communication circuit can be connected to the power supply of the Bluetooth headset for charging, the input end of the Bluetooth headset communication circuit is further connected to the Bluetooth headset control chip, the power supply of the Bluetooth headset is electrically connected to the Bluetooth headset control chip, the charging case communication circuit and the Bluetooth headset communication circuit are communicatively connected, and the Bluetooth headset communication circuit can disconnect the charging connection with the power supply of the Bluetooth headset according to the information fed back by the Bluetooth headset control chip when the Bluetooth headset is fully charged.

[0007] The present utility model is further improved. The charging case communication circuit is provided with a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q3, a resistor R1, a resistor R4 and a resistor R5. Among them, the gate of the field effect transistor Q1 is connected to the built-in power supply of the charging case through the resistor R1, the drain of the field effect transistor Q1 is connected to the input end of the Bluetooth headset communication circuit, the gate of the field effect transistor Q2 is connected to one end of the resistor R4 and the drain of the field effect transistor Q3, the source of the field effect transistor Q2 is connected to the other end of the resistor R4 and the built-in power supply of the charging case, the drain of the field effect transistor Q2 is connected to the input end of the Bluetooth headset communication circuit, the gate of the field effect transistor Q3 is connected to the charging case control chip through the resistor R5, and the source of the field effect transistor Q3 is grounded.

[0008] For further improvement of the present utility model, the charging box communication circuit further includes a resistor R2, a resistor R3, and a resistor R6. One end of the resistor R2 is connected to one end of the resistor R3 and the source electrode of the field effect transistor Q1. The other end of the resistor R2 and the other end of the resistor R3 are connected to the charging box control chip. One end of the resistor R6 is connected to the gate electrode of the field effect transistor Q3, and the other end of the resistor R6 is grounded.

[0009] For further improvement of the present utility model, the Bluetooth headset communication circuit includes a field effect transistor Q4, a diode D8, and a resistor R7. Among them, the drain electrode of the field effect transistor Q4 is connected to the drain electrode of the field effect transistor Q1, the drain electrode of the field effect transistor Q2, and the positive electrode of the diode D8. The negative electrode of the diode D8 is connected to the Bluetooth headset power supply for charging. The gate electrode of the field effect transistor Q4 is connected to the Bluetooth headset control chip through the resistor R7.

[0010] For further improvement of the present utility model, the Bluetooth headset communication circuit further includes a resistor R8 and a resistor R9. One end of the resistor R8 is connected to one end of the resistor R9 and the source electrode of the field effect transistor Q4. The other end of the resistor R8 and the other end of the resistor R9 are connected to the Bluetooth headset control chip.

[0011] For further improvement of the present utility model, the field effect transistor Q1 and the field effect transistor Q3 are NMOS transistors, and the field effect transistor Q2 is a PMOS transistor.

[0012] For further improvement of the present utility model, the resistance values of the resistor R1, the resistor R5, and the resistor R6 are 1KΩ, the resistance values of the resistor R2 and the resistor R3 are 1.5KΩ, and the resistance value of the resistor R4 is 10KΩ.

[0013] For further improvement of the present utility model, the field effect transistor Q4 is an NMOS transistor.

[0014] For further improvement of the present utility model, the resistance value of the resistor R7 is 1KΩ, and the resistance values of the resistor R8 and the resistor R9 are 100Ω.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: A single - wire bidirectional communication circuit for a Bluetooth headset and a charging case is provided. By arranging a charging case communication circuit and a Bluetooth headset communication circuit that cooperate with each other in the single - wire bidirectional communication circuit for the Bluetooth headset and the charging case, the Bluetooth headset communication circuit can disconnect the charging connection with the power supply of the Bluetooth headset according to the information fed back by the Bluetooth headset control chip when the Bluetooth headset is fully charged, can realize the communication function between the Bluetooth headset and the charging case during charging, can realize that the charging of the Bluetooth headset automatically stops and the charging case automatically enters the sleep state after the Bluetooth headset is fully charged, improves the power utilization rate of the charging case, increases the usage time and service life of the charging case, enables the user to better understand the states of the charging case and the Bluetooth headset, greatly enhances the user experience, and solves the problems in the prior art that there is no communication function between the Bluetooth headset and the charging case and the charging case cannot automatically enter the sleep state after the Bluetooth headset is fully charged. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic block diagram of a single - wire bidirectional communication circuit for a Bluetooth headset and a charging case of the present utility model;

[0018] Figure 2 It is a circuit diagram of the charging case communication circuit of the present utility model;

[0019] Figure 3 It is a circuit diagram of the Bluetooth headset communication circuit of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of the embodiments in this application are only for the purpose of describing specific embodiments, and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above - mentioned drawings are intended to cover non - exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above - mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0021] References to "embodiments" in this specification mean that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0022] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0023] As Figures 1-3 shown, a single-line bidirectional communication circuit for a Bluetooth headset and a charging case provided by the present utility model includes a charging case communication circuit and a Bluetooth headset communication circuit. The input end of the charging case communication circuit is connected to the charging case control chip, the built-in power supply of the charging case is connected to the charging case communication circuit and the charging case control chip for power supply, the output end of the charging case communication circuit is connected to the input end of the Bluetooth headset communication circuit, the output end of the Bluetooth headset communication circuit can be connected to the Bluetooth headset power supply for charging, the input end of the Bluetooth headset communication circuit is also connected to the Bluetooth headset control chip, the Bluetooth headset power supply is connected to the Bluetooth headset control chip for power supply, and the charging case communication circuit and the Bluetooth headset communication circuit are communicatively connected. In this embodiment, the Bluetooth headset communication circuit can disconnect the charging connection with the Bluetooth headset power supply according to the information fed back by the Bluetooth headset control chip when the Bluetooth headset is fully charged, can implement the communication function between the Bluetooth headset and the charging case during charging, can automatically stop charging the Bluetooth headset and the charging case can automatically enter the sleep state after the Bluetooth headset is fully charged, improving the power utilization rate of the charging case, increasing the usage time and service life of the charging case, enabling the user to better understand the states of the charging case and the Bluetooth headset, and greatly enhancing the user experience.

[0024] As Figure 2As shown, the charging case communication circuit is provided with a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q3, a resistor R1, a resistor R4 and a resistor R5. Among them, the gate of the field effect transistor Q1 is connected to the built-in power supply of the charging case through the resistor R1, the drain of the field effect transistor Q1 is connected to the input end of the Bluetooth headset communication circuit, the gate of the field effect transistor Q2 is connected to one end of the resistor R4 and the drain of the field effect transistor Q3, the source of the field effect transistor Q2 is connected to the other end of the resistor R4 and the built-in power supply of the charging case, the drain of the field effect transistor Q2 is connected to the input end of the Bluetooth headset communication circuit, the gate of the field effect transistor Q3 is connected to the charging case control chip through the resistor R5, and the source of the field effect transistor Q3 is grounded; the charging case communication circuit is also provided with a resistor R2, a resistor R3 and a resistor R6. One end of the resistor R2 is connected to one end of the resistor R3 and the source of the field effect transistor Q1, the other end of the resistor R2 and the other end of the resistor R3 are connected to the charging case control chip, one end of the resistor R6 is connected to the gate of the field effect transistor Q3, and the other end of the resistor R6 is grounded; the field effect transistor Q1 and the field effect transistor Q3 are NMOS transistors, the field effect transistor Q2 is a PMOS transistor, the resistance values of the resistors R1, R5 and R6 are 1KΩ, the resistance values of the resistors R2 and R3 are 1.5KΩ, and the resistance value of the resistor R4 is 10KΩ. In this embodiment, the charging case communication circuit is used to provide a charging function and a communication function for the Bluetooth headset communication circuit.

[0025] As Figure 3 shown, the Bluetooth headset communication circuit is provided with a field effect transistor Q4, a diode D8 and a resistor R7. Among them, the drain of the field effect transistor Q4 is connected to the drain of the field effect transistor Q1, the drain of the field effect transistor Q2 and the positive pole of the diode D8, the negative pole of the diode D8 is connected to the Bluetooth headset power supply for charging, and the gate of the field effect transistor Q4 is connected to the Bluetooth headset control chip through the resistor R7; the Bluetooth headset communication circuit is also provided with a resistor R8 and a resistor R9. One end of the resistor R8 is connected to one end of the resistor R9 and the source of the field effect transistor Q4, and the other end of the resistor R8 and the other end of the resistor R9 are connected to the Bluetooth headset control chip; the field effect transistor Q4 is an NMOS transistor, the resistance value of the resistor R7 is 1KΩ, and the resistance values of the resistors R8 and R9 are 100Ω. In this embodiment, the Bluetooth headset communication circuit is used to provide a charging function for the Bluetooth headset power supply and communicate with the charging case communication circuit.

[0026] When the charging case charges the Bluetooth headset: The control chip of the charging case gives a high level to the Vout_EN pin of the communication circuit of the charging case. The field effect transistor Q3 conducts, the field effect transistor Q2 conducts, and the diode D8 conducts. The CHAGE_5V pin of the communication circuit of the Bluetooth headset conducts to charge the power supply of the Bluetooth headset. After the power supply of the Bluetooth headset is fully charged, the control chip of the Bluetooth headset feeds back information through the communication circuit of the Bluetooth headset and the communication circuit of the charging case to the control chip of the charging case. The control chip of the charging case gives a low level to the Vout_EN pin of the communication circuit of the charging case, disconnects the charging connection and the charging case automatically enters the sleep state.

[0027] When the charging case sends information to the Bluetooth headset: The control chip of the charging case gives a low level to the Vout_EN pin of the communication circuit of the charging case. The field effect transistor Q3 is cut off, the field effect transistor Q2 is cut off. The control chip of the charging case sends data to the CDH_TX pin of the communication circuit of the charging case. The control chip of the Bluetooth headset controls the conduction voltage through the gate of the field effect transistor Q4. The control chip of the Bluetooth headset receives data through the BT_RX pin of the communication circuit of the Bluetooth headset.

[0028] When the Bluetooth headset sends information to the charging case: The control chip of the Bluetooth headset controls the conduction voltage through the gate of the field effect transistor Q4. The control chip of the Bluetooth headset sends data to the BT_TX pin of the communication circuit of the Bluetooth headset. The control chip of the charging case gives a low level to the Vout_EN pin of the communication circuit of the charging case. The field effect transistor Q3 is cut off, the field effect transistor Q2 is cut off. The control chip of the charging case receives data through the CDH_RX pin of the communication circuit of the charging case.

[0029] As can be seen from the above, the present invention provides a single-wire bidirectional communication circuit for a Bluetooth headset and a charging case. By setting a communication circuit of the charging case and a communication circuit of the Bluetooth headset that cooperate with each other in the single-wire bidirectional communication circuit for the Bluetooth headset and the charging case, the communication circuit of the Bluetooth headset can disconnect the charging connection with the power supply of the Bluetooth headset according to the information fed back by the control chip of the Bluetooth headset when the Bluetooth headset is fully charged, can realize the communication function between the Bluetooth headset and the charging case during charging, can realize that the charging automatically stops after the Bluetooth headset is fully charged and the charging case automatically enters the sleep state, improves the power utilization rate of the charging case, increases the usage time and service life of the charging case, enables the user to better understand the states of the charging case and the Bluetooth headset, greatly improves the user experience, and solves the problems in the prior art that there is no communication function between the Bluetooth headset and the charging case and the charging case cannot automatically enter the sleep state after the Bluetooth headset is fully charged.

[0030] The above-described specific embodiments are the preferred embodiments of the present invention, and do not limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to this specific embodiment. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. A single - wire bidirectional communication circuit for a Bluetooth headset and a charging case, characterized in that: It includes a charging case communication circuit and a Bluetooth headset communication circuit. The input end of the charging case communication circuit is connected to the charging case control chip. The built-in power supply of the charging case is electrically connected to the charging case communication circuit and the charging case control chip. The output end of the charging case communication circuit is connected to the input end of the Bluetooth headset communication circuit. The output end of the Bluetooth headset communication circuit can be electrically connected to the Bluetooth headset power supply for charging. The input end of the Bluetooth headset communication circuit is also connected to the Bluetooth headset control chip. The Bluetooth headset power supply is electrically connected to the Bluetooth headset control chip. The charging case communication circuit and the Bluetooth headset communication circuit are communicatively connected. The Bluetooth headset communication circuit can disconnect the charging connection with the Bluetooth headset power supply according to the information fed back by the Bluetooth headset control chip when the Bluetooth headset is fully charged.

2. The single-wire bidirectional communication circuit for a Bluetooth headset and a charging case according to claim 1, characterized in that: The charging case communication circuit is provided with a field-effect transistor Q1, a field-effect transistor Q2, a field-effect transistor Q3, a resistor R1, a resistor R4 and a resistor R5. Among them, the gate of the field-effect transistor Q1 is connected to the built-in power supply of the charging case through the resistor R1. The drain of the field-effect transistor Q1 is connected to the input end of the Bluetooth headset communication circuit. The gate of the field-effect transistor Q2 is connected to one end of the resistor R4 and the drain of the field-effect transistor Q3. The source of the field-effect transistor Q2 is connected to the other end of the resistor R4 and the built-in power supply of the charging case. The drain of the field-effect transistor Q2 is connected to the input end of the Bluetooth headset communication circuit. The gate of the field-effect transistor Q3 is connected to the charging case control chip through the resistor R5. The source of the field-effect transistor Q3 is grounded.

3. The single-wire two-way communication circuit for a Bluetooth headset and a charging case according to claim 2, characterized in that: The charging case communication circuit is also provided with a resistor R2, a resistor R3 and a resistor R6. One end of the resistor R2 is connected to one end of the resistor R3 and the source of the field-effect transistor Q1. The other end of the resistor R2 and the other end of the resistor R3 are connected to the charging case control chip. One end of the resistor R6 is connected to the gate of the field-effect transistor Q3. The other end of the resistor R6 is grounded.

4. The single-wire bidirectional communication circuit for a Bluetooth headset and a charging case according to claim 3, characterized in that: The Bluetooth headset communication circuit is provided with a field-effect transistor Q4, a diode D8 and a resistor R7. Among them, the drain of the field-effect transistor Q4 is connected to the drain of the field-effect transistor Q1, the drain of the field-effect transistor Q2 and the positive pole of the diode D8. The negative pole of the diode D8 is electrically connected to the Bluetooth headset power supply for charging. The gate of the field-effect transistor Q4 is connected to the Bluetooth headset control chip through the resistor R7.

5. The single-wire two-way communication circuit for a Bluetooth headset and a charging case according to claim 4, characterized in that: The Bluetooth headset communication circuit is also provided with a resistor R8 and a resistor R9. One end of the resistor R8 is connected to one end of the resistor R9 and the source of the field-effect transistor Q4. The other end of the resistor R8 and the other end of the resistor R9 are connected to the Bluetooth headset control chip.

6. The single-wire two-way communication circuit for a Bluetooth headset and a charging case according to claim 5, wherein: The field-effect transistor Q1 and the field-effect transistor Q3 are NMOS transistors. The field-effect transistor Q2 is a PMOS transistor.

7. The single-wire two-way communication circuit for a Bluetooth headset and a charging case according to claim 6, wherein: The resistance values of the resistor R1, the resistor R5 and the resistor R6 are 1KΩ. The resistance values of the resistor R2 and the resistor R3 are 1.5KΩ. The resistance value of the resistor R4 is 10KΩ.

8. The single-wire two-way communication circuit for a Bluetooth headset and a charging case according to claim 7, characterized in that: The field effect transistor Q4 is an NMOS transistor.

9. The single - wire bidirectional communication circuit for a Bluetooth headset and a charging case according to claim 8, wherein: The resistance value of the resistor R7 is 1 KΩ, and the resistance values of the resistor R8 and the resistor R9 are 100 Ω.

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