Wireless charging circuit for Bluetooth sound equipment

Abstract

The utility model discloses a wireless charging circuit used for Bluetooth sound equipment, and relates to the technical field of Bluetooth sound equipment, the wireless charging circuit comprises a wireless charging seat, a wireless charging module and a lithium battery charging circuit, the wireless charging seat and the wireless charging module supply power, the wireless charging module is used for providing charging voltage for the 5V Bluetooth sound equipment, or the lithium battery charging circuit is used for charging the 5V Bluetooth sound equipment. The lithium battery charging circuit provides charging voltage for the 7.4 V Bluetooth sound equipment, the lithium battery charging circuit comprises a voltage reduction unit and a self-adaptive boost charging unit, and the voltage reduction unit is connected with the output end of the wireless charging module and the input end of the self-adaptive boost charging unit. When the wireless charging module provides charging voltage for the 5V Bluetooth sound equipment, the lithium battery charging circuit does not work, and when the lithium battery charging circuit works, the self-adaptive boost charging unit can adjust charging current in a self-adaptive manner, so that the charger is prevented from being damaged due to overpower.

Description

Technical Field

[0001] This utility model relates to the field of Bluetooth speaker technology, and in particular to a wireless charging circuit for Bluetooth speakers. Background Technology

[0002] A 7.4V Bluetooth speaker is a wireless audio device powered by a 7.4V voltage. Compared to common 3.7V or 5V speakers, it can provide stronger power output, resulting in greater volume and fuller low-frequency performance, making it suitable for playing music with a wide dynamic range, such as pop and electronic music.

[0003] Most existing 7.4V Bluetooth speakers use buck charging circuits, which can easily lead to over-power damage to the charger. Utility Model Content

[0004] The main purpose of this utility model is to provide a wireless charging circuit for Bluetooth speakers, aiming to solve the technical problem that most charging circuits for 7.4V Bluetooth speakers use step-down charging circuits, which can easily lead to over-power damage to the charger.

[0005] To achieve the above objectives, this utility model proposes a wireless charging circuit for Bluetooth speakers, comprising a wireless charging base, a wireless charging module, and a lithium battery charging circuit. The wireless charging base is powered by the wireless charging module, which provides charging voltage to a 5V Bluetooth speaker, or provides charging voltage to a 7.4V Bluetooth speaker via the lithium battery charging circuit. The lithium battery charging circuit includes a buck unit and an adaptive boost charging unit, wherein the buck unit is connected to the output terminal of the wireless charging module and the input terminal of the adaptive boost charging unit, respectively.

[0006] In one embodiment of this utility model, the wireless charging module is a 15W wireless charging module, and the output voltage of the 15W wireless charging module is 5V or 9V.

[0007] In one embodiment of this utility model, the step-down unit includes a step-down chip, resistors RS6, RS7, RS4, RS12, RS14, capacitors CS6, CS7, CS8, CS9, CS10, CS11, CS15, CS17, CS19, inductors LS2 and LS4; the EN pin of the step-down chip is connected to one end of resistors RS6 and RS7 respectively, and the other end of resistor RS6 is connected to the DC_EN pin of the wireless charging module; the IN pin of the step-down chip is connected to the BVBUSC pin of the wireless charging module via capacitors CS6, CS7, and CS15 respectively; capacitors CS6, CS7, and CS15 are connected to the DC_EN pin of the wireless charging module. The other ends of S7, capacitor CS15, and resistor RS7 are grounded; the SW pin of the buck converter is connected to one end of resistor RS14, resistor RS12, and inductor L2 respectively. The other end of resistor RS14 is grounded through capacitor CS17. The other end of resistor RS12 is connected to the BS pin of the buck converter through capacitor CS8. The other end of inductor LS2 is connected to inductor LS4, resistor RS4, capacitor CS11, and capacitor CS9 respectively. Resistor RS4 and capacitor CS11 are connected to the FB pin of the buck converter and resistor RS5 respectively. The other end of resistor RS5 is grounded. Capacitor CS9 is grounded. Inductor LS4 is connected to one end of capacitor CS10 and capacitor CS19 respectively, and is connected to the boost charging unit through the CH_5V pin.

[0008] In one embodiment of this utility model, the withstand voltage of the step-down chip is greater than or equal to 30V.

[0009] In one embodiment of this utility model, the adaptive boost charging unit includes an adaptive boost chip and a vertical patch connected to the output terminal of the adaptive boost chip, wherein the output terminal of the vertical patch is connected to the battery of a 7.4V Bluetooth speaker.

[0010] In one embodiment of this utility model, both the wireless charging module and the adaptive boost charging unit are equipped with indicator lights.

[0011] The present invention proposes a wireless charging circuit for Bluetooth speakers. The wireless charging module provides charging voltage to the 5V Bluetooth speaker, or provides charging voltage to the 7.4V Bluetooth speaker via the lithium battery charging circuit. When the wireless charging module provides charging voltage to the 5V Bluetooth speaker, the lithium battery charging circuit does not work. When the lithium battery charging circuit works, the adaptive boost charging unit can adaptively adjust the charging current to avoid overpowering and damaging the charger. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0013] Figure 1 This is a schematic block diagram of an embodiment of the wireless charging circuit for Bluetooth speakers according to this utility model;

[0014] Figure 2 Circuit diagram of the wireless charging dock and wireless charging module provided by this utility model;

[0015] Figure 3 The circuit diagram of the step-down unit provided by this utility model;

[0016] Figure 4 The circuit diagram of the adaptive boost charging unit provided by this utility model is shown in the figure.

[0017] In the diagram, 100 is the wireless charging dock, 200 is the wireless charging module, 300 is the lithium battery charging circuit, 310 is the buck unit, and 320 is the adaptive boost charging unit.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] Figure 1 This is a schematic block diagram of an embodiment of the wireless charging circuit for Bluetooth speakers according to this utility model, as shown below. Figure 1 As shown, this utility model proposes a wireless charging circuit for Bluetooth speakers, including a wireless charging base 100, a wireless charging module 200, and a lithium battery charging circuit 300. The wireless charging base 100 and the wireless charging module 200 are powered by each other. The wireless charging module 200 is used to provide charging voltage to a 5V Bluetooth speaker, or to provide charging voltage to a 7.4V Bluetooth speaker via the lithium battery charging circuit 300. The lithium battery charging circuit 300 includes a step-down unit 310 and an adaptive boost charging unit 320. The step-down unit 310 is connected to the output terminal of the wireless charging module 200 and the input terminal of the adaptive boost charging unit 320, respectively. The adaptive boost charging unit 320 powers the battery of the Bluetooth speaker.

[0024] Optional, such as Figure 2As shown, the wireless charging module 200 is a 15W wireless charging module 200, and its output voltage is 5V or 9V. The maximum charging power of the 15W wireless charging module 200 can reach 15 watts. The specific rules of the fast charging protocol adopted by the 15W wireless charging module 200 are as follows: when the output voltage is 5V, the wireless charging module 200 works, and the lithium battery charging circuit 300 does not work; when the output voltage of the wireless charging module 200 is 9V, the lithium battery charging circuit 300 starts to work; when the output voltage of the wireless charging module 200 is 9V or 12V, the power of the wireless charging module 200 is sufficient for the lithium battery charging circuit 300 to work, and the wireless charging module 200 and the lithium battery charging circuit 300 can work simultaneously. It can be adapted to various chargers, avoiding damage to the charger due to overpowering.

[0025] The Wireless Charging Stand 100 uses TYPE CF 16P upright mounting, four legs with posts, and H6.83A3MD stainless steel braided tape.

[0026] Optional, such as Figure 3 As shown, the step-down unit 310 includes a step-down chip, resistors RS6, RS7, RS4, RS12, RS14, capacitors CS6, CS7, CS8, CS9, CS10, CS11, CS15, CS17, CS19, inductors LS2 and LS4. The EN pin of the step-down chip is connected to one end of resistors RS6 and RS7, respectively. The other end of resistor RS6 is connected to the DC_EN pin of the wireless charging module 200. The IN pin of the step-down chip is connected to the BVBUSC pin of the wireless charging module 200 via capacitors CS6, CS7, and CS15, respectively. 7. The other ends of capacitor CS15 and resistor RS7 are grounded; the SW pin of the buck converter is connected to one end of resistor RS14, resistor RS12 and inductor L2 respectively. The other end of resistor RS14 is grounded through capacitor CS17. The other end of resistor RS12 is connected to the BS pin of the buck converter through capacitor CS8. The other end of inductor LS2 is connected to inductor LS4, resistor RS4, capacitor CS11 and capacitor CS9 respectively. Resistor RS4 and capacitor CS11 are connected to the FB pin of the buck converter and resistor RS5 respectively. The other end of resistor RS5 is grounded. Capacitor CS9 is grounded. Inductor LS4 is connected to one end of capacitor CS10 and capacitor CS19 respectively, and is connected to the boost charging unit through the CH_5V pin.

[0027] Optionally, the voltage withstand value of the step-down chip is greater than or equal to 30V, and the step-down chip solves the problem of voltage incompatibility between the wireless charging module 200 and the lithium battery charging circuit 300.

[0028] Optional, such as Figure 4As shown, the adaptive boost charging unit 320 includes an adaptive boost chip and a vertical patch connected to the output terminal of the adaptive boost chip. The output terminal of the vertical patch is connected to the battery of the 7.4V Bluetooth speaker. Specifically, the adaptive boost chip refers to a chip that can adaptively adjust the charging current to avoid over-power damage to the charger.

[0029] Optionally, both the wireless charging module 200 and the adaptive boost charging unit 320 are equipped with indicator lights. The indicator lights are used to indicate the respective operating status of the wireless charging module 200 and the adaptive boost charging unit 320.

[0030] In summary, this utility model provides charging voltage to a 5V Bluetooth speaker via the wireless charging module 200, or to a 7.4V Bluetooth speaker via the lithium battery charging circuit 300. When the wireless charging module 200 provides charging voltage to the 5V Bluetooth speaker, the lithium battery charging circuit 300 does not operate. When the lithium battery charging circuit 300 operates, the adaptive boost charging unit 320 can adaptively adjust the charging current to avoid overpowering and damaging the charger.

[0031] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A wireless charging circuit for Bluetooth speakers, characterized in that, The device includes a wireless charging dock, a wireless charging module, and a lithium battery charging circuit. The wireless charging dock is powered by the wireless charging module. The wireless charging module is used to provide charging voltage to a 5V Bluetooth speaker, or to provide charging voltage to a 7.4V Bluetooth speaker via the lithium battery charging circuit. The lithium battery charging circuit includes a buck unit and an adaptive boost charging unit. The buck unit is connected to the output terminal of the wireless charging module and the input terminal of the adaptive boost charging unit, respectively. The step-down unit includes a step-down chip, resistors RS6, RS7, RS4, RS12, RS14, capacitors CS6, CS7, CS8, CS9, CS10, CS11, CS15, CS17, CS19, inductors LS2 and LS4. The EN pin of the step-down chip is connected to one end of resistors RS6 and RS7, respectively. The other end of resistor RS6 is connected to the DC_EN pin of the wireless charging module. The IN pin of the step-down chip is connected to the BVBUSC pin of the wireless charging module via capacitors CS6, CS7, and CS15, respectively. 15 and the other end of resistor RS7 are grounded; the SW pin of the buck chip is connected to one end of resistor RS14, resistor RS12 and inductor L2 respectively. The other end of resistor RS14 is grounded through capacitor CS17. The other end of resistor RS12 is connected to the BS pin of the buck chip through capacitor CS8. The other end of inductor LS2 is connected to inductor LS4, resistor RS4, capacitor CS11 and capacitor CS9 respectively. Resistor RS4 and capacitor CS11 are connected to the FB pin of the buck chip and resistor RS5 respectively. The other end of resistor RS5 is grounded. Capacitor CS9 is grounded. Inductor LS4 is connected to one end of capacitor CS10 and capacitor CS19 respectively, and is connected to the boost charging unit through the CH_5V pin. The adaptive boost charging unit includes an adaptive boost chip and a vertical patch connected to the output terminal of the adaptive boost chip. The output terminal of the vertical patch is connected to the battery of a 7.4V Bluetooth speaker.

2. The wireless charging circuit for Bluetooth speakers according to claim 1, characterized in that, The wireless charging module is a 15W wireless charging module, and the output voltage of the 15W wireless charging module is 5V or 9V.

3. The wireless charging circuit for Bluetooth speakers according to claim 1, characterized in that, The voltage withstand value of the step-down chip is greater than or equal to 30V.

4. The wireless charging circuit for Bluetooth speakers according to claim 1, characterized in that, Both the wireless charging module and the adaptive boost charging unit are equipped with indicator lights.

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