Outdoor bluetooth sound box control circuit structure

Abstract

The application relates to the technical field of Bluetooth sound box control, and particularly discloses an outdoor Bluetooth sound box control circuit structure which comprises a Bluetooth master control module, a power supply and charging management module, an audio module and a fast charging module; the power supply and charging management module and the audio module are electrically connected with the Bluetooth master control module respectively; the fast charging module is electrically connected with the power supply and charging management module and is used for providing an interface for realizing reverse fast charging of the Bluetooth sound box; the Bluetooth master control module comprises a Bluetooth master control chip U1 and a voltage division detection unit; the model of the Bluetooth master control chip U1 is BP1048B2; the Bluetooth master control chip U1 is used for realizing interconnection and synchronous sound emission of multiple Bluetooth sound boxes; the power supply and charging management module and the audio module are electrically connected with the Bluetooth master control chip U1 respectively; and the voltage division detection unit is arranged between the power supply and charging management module and the Bluetooth master control chip U1; the outdoor Bluetooth sound box control circuit structure can realize interconnection and synchronous sound emission of multiple Bluetooth sound boxes and can realize the reverse fast charging function of the Bluetooth sound box on an external intelligent terminal.

Description

Technical Field

[0001] This invention relates to the field of Bluetooth speaker control technology, and in particular to a control circuit structure for an outdoor Bluetooth speaker. Background Technology

[0002] Most existing outdoor Bluetooth speakers use a traditional one-to-one Bluetooth connection circuit architecture, which has a single function and only supports a single smart terminal to connect to a single Bluetooth speaker to play audio. It cannot realize the interconnection and synchronous sound output of multiple Bluetooth speakers, has poor network scalability, and does not integrate reverse fast charging function for external smart terminals. Its outdoor power supply adaptability is extremely poor, making it difficult to meet the needs of outdoor multi-area, stereo distributed playback and outdoor power supply.

[0003] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide an outdoor Bluetooth speaker control circuit structure that can realize the interconnection and synchronous sound output of multiple Bluetooth speakers, and also realize the reverse fast charging function of the Bluetooth speaker to external smart terminals.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This application proposes a control circuit structure for an outdoor Bluetooth speaker, comprising a Bluetooth main control module, a power supply and charging management module, an audio module, and a fast charging module. The power supply and charging management module and the audio module are electrically connected to the Bluetooth main control module, and the fast charging module is electrically connected to the power supply and charging management module. The fast charging module provides an interface for reverse fast charging of the Bluetooth speaker. The Bluetooth main control module includes a Bluetooth main control chip U1 and a voltage divider detection unit. The Bluetooth main control chip U1 is a BP1048B2, used to enable multiple Bluetooth speakers to interconnect and emit sound synchronously. The power supply and charging management module and the audio module are electrically connected to the Bluetooth main control chip U1. The voltage divider detection unit is located between the power supply and charging management module and the Bluetooth main control chip U1, and is used to detect the charging level of the Bluetooth speaker and whether it is under fast charging load.

[0007] In the outdoor Bluetooth speaker control circuit structure, the Bluetooth main control module further includes an audio input MIC socket CN2, a button interface socket CN3, and a USB interface socket CN4. Pins 1, 2, and 5 of the audio input MIC socket CN2 are connected to pins 40, 41, and 39 of the Bluetooth main control chip U1, respectively. Pins 2 and 5 of the button interface socket CN3 are connected to pins 5 and 21 of the Bluetooth main control chip U1, respectively. Pins 2 and 3 of the USB interface socket CN4 are connected to pins 26 and 27 of the Bluetooth main control chip U1, respectively.

[0008] In the outdoor Bluetooth speaker control circuit structure, the Bluetooth main control module further includes a power on / off control unit, which is electrically connected to the Bluetooth main control chip U1. The power on / off control unit is used to turn the Bluetooth speaker on and off.

[0009] In the outdoor Bluetooth speaker control circuit structure, the voltage divider detection unit includes a first voltage divider detection unit, a second voltage divider detection unit, and a third voltage divider detection unit. The first voltage divider detection unit, the second voltage divider detection unit, and the third voltage divider detection unit are electrically connected to the Bluetooth main control chip U1, respectively. The first voltage divider detection unit is used to detect the battery level of the Bluetooth speaker, the second voltage divider detection unit is used to detect whether the built-in battery of the Bluetooth speaker is powered on, and the third voltage divider detection unit is used to detect whether the Bluetooth speaker is connected to an external charger.

[0010] In the aforementioned outdoor Bluetooth speaker control circuit structure, the power supply and charging management module includes a charging input unit, a charging management unit, and a transformer power supply unit. The charging management unit, the transformer power supply unit, and the fast charging module are all electrically connected to the charging input unit, and the charging management unit and the fast charging module are electrically connected to each other. The transformer power supply unit is electrically connected to the Bluetooth main control chip U1. The charging input unit is used to provide a stable external input power to the charging management unit, the transformer power supply unit, and the fast charging module. The transformer power supply unit is used to process the voltage output by the charging management unit and then input it to the Bluetooth main control chip U1. The charging management unit is used to manage the charging and discharging of the Bluetooth speaker's built-in battery.

[0011] In the outdoor Bluetooth speaker control circuit structure, the fast charging module includes a fast charging control chip U6, model IP6525T. Pin 7 of the fast charging control chip U6 serves as the power input terminal. Pin 7 of the fast charging control chip U6 is connected to a third diode D3. A forty-seventh capacitor CD47 and a forty-eighth capacitor CD48 are connected in parallel between the third diode D3 and pin 7 of the fast charging control chip U6. The forty-seventh capacitor CD47 and the forty-eighth capacitor CD48 are grounded after being connected in parallel to achieve input power filtering. Pin 8 of the fast charging control chip U6 is the VOUT fast charging output terminal, used to output fast charging energy to the outside.

[0012] In the outdoor Bluetooth speaker control circuit structure, the audio module includes a power amplifier output unit and a power amplifier power supply unit. The power amplifier output unit and the power amplifier power supply unit are electrically connected to the Bluetooth main control chip U1, and the power amplifier power supply unit is electrically connected to the charging management unit. The power amplifier power supply unit is used to transform and convert the input power of the charging management unit and output it to the power amplifier output unit. The power amplifier output unit is used to amplify the audio signal of the Bluetooth main control chip U1 to drive the built-in speaker of the Bluetooth speaker.

[0013] In the outdoor Bluetooth speaker control circuit structure, the audio module further includes an operational amplifier unit, which is connected between the power amplifier output unit and the Bluetooth main control chip U1. The operational amplifier unit is used to acquire audio signals from the built-in microphone of the Bluetooth speaker.

[0014] In the outdoor Bluetooth speaker control circuit structure, the audio module further includes a mute circuit unit, which is connected between the power amplifier output unit and the Bluetooth main control chip U1. The mute circuit unit is used to isolate the electrical load between the Bluetooth main control module and the power amplifier output unit.

[0015] Beneficial effects:

[0016] This invention provides a control circuit structure for an outdoor Bluetooth speaker. By setting a voltage divider detection unit between the power supply and charging management module and the Bluetooth main control chip U1 of the Bluetooth main control module, the speaker's battery level and the load access status for external fast charging can be detected in real time. The Bluetooth main control module uses the BP1048B2 Bluetooth main control chip U1 to achieve interconnection of multiple Bluetooth speakers, enabling the audio modules of multiple Bluetooth speakers to drive their speakers to emit sound synchronously, expanding the networking capability of Bluetooth speakers, and meeting the usage requirements of outdoor multi-area stereo playback. At the same time, a fast charging module is integrated to realize reverse fast charging of external smart terminals, effectively improving the power supply adaptability in outdoor scenarios. The various modules of the overall circuit work closely together, adapting to the integrated design of outdoor Bluetooth speaker products, and are highly practical and reliable. Attached Figure Description

[0017] Figure 1 A circuit block diagram of the outdoor Bluetooth speaker control circuit structure provided by the present invention;

[0018] Figure 2 This is a partial circuit schematic diagram of the Bluetooth master control chip U1 provided by the present invention;

[0019] Figure 3 The circuit schematic diagram of the voltage divider detection unit provided by the present invention;

[0020] Figure 4 The circuit schematic diagram of the power on / off control unit provided by the present invention;

[0021] Figure 5 A circuit schematic diagram of the charging input unit provided by the present invention;

[0022] Figure 6 A circuit schematic diagram of the charging management unit provided by the present invention;

[0023] Figure 7 The circuit schematic diagram of the transformer power supply unit provided by the present invention;

[0024] Figure 8 The circuit schematic diagram of the fast charging module provided by the present invention;

[0025] Figure 9 The circuit schematic diagram of the power amplifier output unit provided by the present invention;

[0026] Figure 10 The circuit schematic diagram of the power amplifier power supply unit provided by the present invention;

[0027] Figure 11 The circuit schematic of the operational amplifier unit provided by this invention;

[0028] Figure 12 The circuit diagram of the silent circuit unit provided by the present invention.

[0029] Key component symbols: 1000 - Bluetooth main control module, 1010 - Voltage divider detection unit, 1011 - First voltage divider detection section, 1012 - Second voltage divider detection section, 1013 - Third voltage divider detection section, 1020 - Power on / off control unit, 2000 - Power supply and charging management module, 2010 - Charging input unit, 2020 - Charging management unit, 2030 - Transformer power supply unit, 3000 - Audio module, 3010 - Power amplifier output unit, 3020 - Power amplifier power supply unit, 3030 - Operational amplifier unit, 3040 - Mute circuit unit, 4000 - Fast charging module. Detailed Implementation

[0030] To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention 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 and not intended to limit the scope of this application.

[0031] In the description of this invention, it should be understood that the terms "inner" and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. 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 indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0032] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Please see Figures 1 to 12 This invention provides a control circuit structure for an outdoor Bluetooth speaker, comprising a Bluetooth main control module 1000, a power supply and charging management module 2000, an audio module 3000, and a fast charging module 4000. The power supply and charging management module 2000 and the audio module 3000 are electrically connected to the Bluetooth main control module 1000, and the fast charging module 4000 is electrically connected to the power supply and charging management module 2000. The fast charging module 4000 provides an interface for reverse fast charging of the Bluetooth speaker. The Bluetooth main control module 1000 includes a Bluetooth main control chip U1 and a voltage divider detection module. The U1 Bluetooth main control chip is model BP1048B2. The BP1048B2 chip is a 32-bit DSP Bluetooth audio processor that supports Bluetooth multi-device networking protocol and can realize the interconnection and synchronous sound output of multiple Bluetooth speakers. The power supply and charging management module 2000 and the audio module 3000 are electrically connected to the Bluetooth main control chip U1. The voltage divider detection unit 1010 is set between the power supply and charging management module 2000 and the Bluetooth main control chip U1. The voltage divider detection unit 1010 is used to detect the charging power of the Bluetooth speaker and whether it is under fast charging load.

[0034] In practical applications, by setting a voltage divider detection unit 1010 between the power supply and charging management module 2000 and the Bluetooth main control chip U1 of the Bluetooth main control module 1000, the speaker battery level and the load access status of external fast charging can be detected in real time. The Bluetooth main control module 1000 adopts the BP1048B2 model Bluetooth main control chip U1 to realize the interconnection of multiple Bluetooth speakers, so that the audio modules 3000 of multiple Bluetooth speakers drive their speakers to emit sound synchronously, expand the networking capability of Bluetooth speakers, meet the usage needs of outdoor multi-area stereo playback, and integrate a fast charging module 4000 to realize reverse fast charging of external smart terminals, effectively improving the power supply adaptability in outdoor scenarios. The modules of the overall circuit are closely coordinated, adapting to the integrated design of outdoor Bluetooth speaker products, with strong practicality and good reliability.

[0035] Optional, such as Figure 2 As shown, in some embodiments, the Bluetooth master control module 1000 further includes an audio input MIC jack CN2, a button interface jack CN3, and a USB interface jack CN4. Pins 1, 2, and 5 of the audio input MIC jack CN2 are connected to pins 40, 41, and 39 of the Bluetooth master control chip U1, respectively. Pins 2 and 5 of the button interface jack CN3 are connected to pins 5 and 21 of the Bluetooth master control chip U1, respectively. Pins 2 and 3 of the USB interface jack CN4 are connected to pins 26 and 27 of the Bluetooth master control chip U1, respectively.

[0036] Further optional, such as Figure 4As shown, in some embodiments, the Bluetooth master control module 1000 further includes a power-on / off control unit 1020. The power-on / off control unit 1020 is electrically connected to the Bluetooth master control chip U1 and is used to power on and off the Bluetooth speaker. The power-on / off control unit 1020 includes a seventh diode D7, an eighth diode D8, a ninth diode D9, a fifth transistor Q5, an eighth power MOSFET U8, sixtieth resistors R60, sixty-first resistor R61, sixty-second resistor R62, sixty-third resistor R63, a fifth fuse FB5, and a second battery terminal block VH2. The PWR_KEY pin of the Bluetooth master control module 1000 is connected to the seventh diode D7 to receive the button power-on trigger signal, and the KW pin of the Bluetooth master control module 1000 is connected to the ninth diode D9 to output a self-locking sustain signal. The PWR_KEY signal passes through the seventh diode D7... Diode D7 and the eighth diode D8 are input to the fifth transistor Q5. The KW signal drives the fifth transistor Q5 through the ninth diode D9 and the sixty-first resistor R61. The fifth transistor Q5 controls the gate level of the eighth power MOSFET U8 through the sixtieth resistor R60 and the sixty-third resistor R63, that is, controls the eighth power MOSFET U8 to be turned on or off. When the eighth power MOSFET U8 is turned on, the BAT_+V main power supply is output through the fifth fuse FB5. The Bluetooth main control module 1000 maintains the fifth transistor Q5 on through the KW pin level, which can realize the power-on self-locking function of the Bluetooth speaker. In addition, the second battery terminal block VH2 is connected to the source S of the eighth power MOSFET U8. The second battery terminal block VH2 is used to connect an external 12V lithium battery pack, and the power of the 12V lithium battery pack is connected to the power-on control unit 1020 to provide the original power input for the Bluetooth main control module 1000.

[0037] like Figure 3As shown, in some embodiments, the voltage divider detection unit 1010 includes a first voltage divider detection unit 1011, a second voltage divider detection unit 1012, and a third voltage divider detection unit 1013. The first voltage divider detection unit 1011, the second voltage divider detection unit 1012, and the third voltage divider detection unit 1013 are electrically connected to the Bluetooth main control chip U1. The first voltage divider detection unit 1011 is used to detect the battery level of the Bluetooth speaker's built-in battery, the second voltage divider detection unit 1012 is used to detect whether the built-in battery of the Bluetooth speaker is powered on, and the third voltage divider detection unit 1013 is used to detect whether the Bluetooth speaker is connected to an external charger. The first voltage divider detection unit 1011 includes a forty-ninth resistor R49 and a fifty-fourth resistor R54. The BAT battery terminal is connected to the resistor R49 and the fifty-fourth resistor R54. The voltage divider circuit formed by resistor R54 divides the voltage to obtain the BAT_DET detection signal, which is input to pin 29 of the Bluetooth main control chip U1. The second voltage divider detection unit 1012 includes the fiftieth resistor R50 and the fifty-fifth resistor R55. The BAT_+V main power supply terminal is connected to the voltage divider circuit formed by the fiftieth resistor R50 and the fifty-fifth resistor R55, which divides the voltage to obtain the SW_DET detection signal, which is input to pin 20 of the Bluetooth main control chip U1. The third voltage divider detection unit 1013 includes the fifty-first resistor R51 and the fifty-sixth resistor R56. The DC_15V external charging input terminal is connected to the voltage divider circuit formed by the fifty-first resistor R51 and the fifty-sixth resistor R56, which divides the voltage to obtain the DC_DET detection signal, which is input to pin 19 of the Bluetooth main control chip U1.

[0038] In some embodiments, the power supply and charging management module 2000 includes a charging input unit 2010, a charging management unit 2020, and a transformer power supply unit 2030. The charging management unit 2020, the transformer power supply unit 2030, and the fast charging module 4000 are all electrically connected to the charging input unit 2010, and the charging management unit 2020 and the fast charging module 4000 are electrically connected to each other. The transformer power supply unit 2030 is electrically connected to the Bluetooth main control chip U1. The charging input unit 2010 is used to provide a stable external input power to the charging management unit 2020, the transformer power supply unit 2030, and the fast charging module 4000. The transformer power supply unit 2030 is used to process the voltage output by the charging management unit 2020 and input it to the Bluetooth main control chip U1. The charging management unit 2020 is used to implement the charging and discharging management of the built-in battery of the Bluetooth speaker.

[0039] Among them, such as Figure 5As shown, the charging input unit 2010 includes a first connector CN1, a third fuse FB3, a second common-mode inductor ET2, a fourteenth-seventh resistor R47, a thirty-fifth capacitor CD35, an eighth capacitor C8, a thirty-sixth capacitor CD36, an eleventh capacitor C11, a sixth capacitor C6, a fortieth capacitor CD40, a thirty-first capacitor CD31, and a forty-fourth capacitor CD44. The first connector CN1 is an external power input interface. The external adapter output power is input as DC15V through pin 6 of the first connector CN1. The PGND pin of the first connector CN1 is the power ground, realizing the electrical connection between the external power supply and this circuit. One end of the DC15V input node is connected to one end of the thirty-fifth capacitor CD35 and the eighth capacitor C8, and the other end of the thirty-fifth capacitor CD35 and the eighth capacitor C8 is connected to GND, forming the first stage of filtering at the input end to suppress high-frequency interference introduced by the external power supply. The DC15V is then connected to the input end of the third fuse FB3. The third fuse FB3 provides overcurrent protection. When a short circuit or overload fault occurs in the downstream circuit, the third fuse... When FB3 blows, it cuts off the power supply path, protecting all downstream circuit components. The output of the third fuse FB3 receives 15V. At the 15V node, capacitors CD36 (36th), C11 (11th), and C6 (6th) are connected in parallel as a multi-channel filter capacitor to complete the second stage of power supply filtering and suppress voltage ripple. One end of resistor R47 (14th-17th) is connected to the 15V node, and the other end is connected to pin 2 of the second common-mode inductor ET2. Pin 4 of the second common-mode inductor ET2 is grounded. Pins 1 and 3 of the second common-mode inductor ET2 are the output side. The second common-mode inductor ET2 performs EMI electromagnetic filtering on the power line to reduce external radiated interference and suppress external electromagnetic noise. The output side of the second common-mode inductor ET2 is connected in parallel with the 40th capacitor CD40, the 31st capacitor CD31, and the 44th capacitor CD44 for output filtering and voltage regulation, ultimately outputting a stable DC_15V voltage signal. The output DC_15V supplies power to the subsequent charging management unit 2020, the transformer power supply unit 2030, and the fast charging module 4000.

[0040] In addition, such as Figure 6 As shown, the charging management unit 2020 includes a charging management chip U5, model QFN32_SC8803. The QFN32-packaged SC8803 chip is a bidirectional synchronous buck-boost charging and discharging management chip, which has the advantages of strong wide and narrow voltage adaptability, high integration, excellent heat dissipation, high charging and discharging accuracy, and high conversion efficiency. It can adapt to the 15V high voltage input and 12V lithium battery charging and discharging conditions of this embodiment, and is suitable for complex outdoor working environments, ensuring overall power supply stability and battery life. Pin 4 of the charging management chip U5 is electrically connected to pin 35 of the Bluetooth main control chip U1.

[0041] In addition, such as Figure 7 As shown, the transformer power supply unit 2030 includes a transformer power supply chip U9, model CX8824. The CX8824 chip supports a wide range of voltage inputs and features automatic power path selection, high conversion efficiency, few external components, and stable output voltage. It can stably output +5V voltage under both external adapter power supply of the charging input unit 2010 and battery power supply of the charging management unit 2020, providing reliable power supply for the Bluetooth main control chip U1. Pin 1 of the transformer power supply chip U9 is the +5V voltage output terminal, and pin 4 of the transformer power supply chip U9 is the input terminal for the external adapter power supply DC_15V of the charging input unit 2010 and the battery power supply BAT_+V of the charging management unit 2020.

[0042] Specifically, such as Figure 8As shown, in some embodiments, the fast charging module 4000 includes a fast charging control chip U6, which is model IP6525T. Pin 7 of the fast charging control chip U6 serves as the power input terminal. Pin 7 of the fast charging control chip U6 is connected to a third diode D3. A forty-seventh capacitor CD47 and a forty-eighth capacitor CD48 are connected in parallel between the third diode D3 and pin 7 of the fast charging control chip U6. The forty-seventh capacitor CD47 and the forty-eighth capacitor CD48 are grounded after being connected in parallel to achieve input power filtering. Pin 8 of the fast charging control chip U6 is the VOUT fast charging output terminal, which is used to output fast charging energy to the outside. Specifically, pin 2 of the fast charging control chip U6 is connected to the fifth power inductor L5, which is connected to the 5V power network. A forty-sixth capacitor CD46 is connected between pins 2 and 3 of the fast charging control chip U6. Pin 4 of the fast charging control chip U6 is connected to the negative terminal of the first light-emitting diode LED1. The positive terminal of the first light-emitting diode LED1 is connected to the fifty-second resistor R52 and then connected to the fifth power inductor L5 and pin 2 of the fast charging control chip U6, thus driving the fast charging status indicator light. Pins 6 and 5 of the fast charging control chip U6 are respectively connected to the fifty-seventh pull-down resistor R57 and the fifty-ninth pull-down resistor R59 and then grounded for USB fast charging protocol identification. Simultaneously, the output of the power supply and charging management module 2000 is connected to the third common-mode inductor ET3, and the output of the third common-mode inductor ET3 is connected to the fast charging... The control chip U6 provides 5V power to the fast charging module 4000. The fast charging module 4000 also includes a fifth diode D5, a sixth diode D6, a fourth ferrite bead FB4, a fifty-sixth capacitor CD56, and a fifty-seventh capacitor CD57. These diodes are connected to form a PVCC, 15V reverse connection protection input circuit, providing auxiliary power to the fast charging module 4000. The fast charging module 4000 is also connected to a twelfth capacitor C12, a fiftieth capacitor CD50, a fifty-third capacitor CD53, and a fifty-fifth capacitor CD55. These capacitors are all 5V power supply network filter capacitors, enabling 5V power supply filtering.

[0043] More specifically, in some embodiments, the audio module 3000 includes a power amplifier output unit 3010 and a power amplifier power supply unit 3020. The power amplifier output unit 3010 and the power amplifier power supply unit 3020 are electrically connected to the Bluetooth master control chip U1, and the power amplifier power supply unit 3020 is electrically connected to the charging management unit 2020. The power amplifier power supply unit 3020 is used to transform and convert the input power of the charging management unit 2020 and output it to the power amplifier output unit 3010. The power amplifier output unit 3010 is used to amplify the audio signal of the Bluetooth master control chip U1 to drive the built-in speaker of the Bluetooth speaker.

[0044] Among them, such as Figure 9 As shown, the power amplifier output unit 3010 includes a power amplifier output chip U2, which is a TPA3116D2. The TPA3116D2 chip is a dual-channel Class D power amplifier chip with high output power, low audio distortion, integrated multiple fault protections, and flexible peripheral configuration, which can meet the outdoor use needs of Bluetooth speakers for high-power audio amplification to drive speakers.

[0045] In addition, such as Figure 10 As shown, the power amplifier power supply unit 3020 includes a power amplifier power supply chip U3, which is model FP5207. The FP5207 chip has strong driving capability, large output current, supports wide voltage input, and has a simple peripheral circuit. It can stably provide high-power power to the TPA3116D2 chip after boosting, and is suitable for the high-volume working conditions of outdoor Bluetooth speakers.

[0046] like Figure 11 As shown, in some embodiments, the audio module 3000 further includes an operational amplifier unit 3030, which is connected between the power amplifier output unit 3010 and the Bluetooth main control chip U1. The operational amplifier unit 3030 is used to acquire audio signals from the built-in microphone of the Bluetooth speaker.

[0047] like Figure 12 As shown, in some embodiments, the audio module 3000 further includes a mute circuit unit 3040, which is connected between the power amplifier output unit 3010 and the Bluetooth master control chip U1. The mute circuit unit 3040 is used to isolate the electrical load between the Bluetooth master control module 1000 and the power amplifier output unit 3010.

[0048] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A control circuit structure for an outdoor Bluetooth speaker, characterized in that, The system includes a Bluetooth main control module, a power supply and charging management module, an audio module, and a fast charging module. The power supply and charging management module and the audio module are electrically connected to the Bluetooth main control module, and the fast charging module is electrically connected to the power supply and charging management module. The fast charging module provides an interface for reverse fast charging of the Bluetooth speaker. The Bluetooth main control module includes a Bluetooth main control chip U1 and a voltage divider detection unit. The Bluetooth main control chip U1 is a BP1048B2, used to enable simultaneous sound output from multiple Bluetooth speakers. The power supply and charging management module and the audio module are electrically connected to the Bluetooth main control chip U1. The voltage divider detection unit is located between the power supply and charging management module and the Bluetooth main control chip U1, and is used to detect the charging level of the Bluetooth speaker and whether it is under fast charging load.

2. The outdoor Bluetooth speaker control circuit structure according to claim 1, characterized in that, The Bluetooth master control module also includes an audio input MIC jack CN2, a button interface jack CN3, and a USB interface jack CN4. Pins 1, 2, and 5 of the audio input MIC jack CN2 are connected to pins 40, 41, and 39 of the Bluetooth master control chip U1, respectively. Pins 2 and 5 of the button interface jack CN3 are connected to pins 5 and 21 of the Bluetooth master control chip U1, respectively. Pins 2 and 3 of the USB interface jack CN4 are connected to pins 26 and 27 of the Bluetooth master control chip U1, respectively.

3. The outdoor Bluetooth speaker control circuit structure according to claim 2, characterized in that, The Bluetooth master control module also includes a power on / off control unit, which is electrically connected to the Bluetooth master control chip U1 and is used to power on and off the Bluetooth speaker.

4. The outdoor Bluetooth speaker control circuit structure according to claim 1, characterized in that, The voltage divider detection unit includes a first voltage divider detection unit, a second voltage divider detection unit, and a third voltage divider detection unit. The first voltage divider detection unit, the second voltage divider detection unit, and the third voltage divider detection unit are electrically connected to the Bluetooth main control chip U1, respectively. The first voltage divider detection unit is used to detect the power level of the Bluetooth speaker's built-in battery, the second voltage divider detection unit is used to detect whether the Bluetooth speaker's built-in battery is powered on, and the third voltage divider detection unit is used to detect whether the Bluetooth speaker is connected to an external charger.

5. The outdoor Bluetooth speaker control circuit structure according to claim 1, characterized in that, The power supply and charging management module includes a charging input unit, a charging management unit, and a transformer power supply unit. The charging management unit, the transformer power supply unit, and the fast charging module are all electrically connected to the charging input unit, and the charging management unit and the fast charging module are electrically connected to each other. The transformer power supply unit is electrically connected to the Bluetooth main control chip U1. The charging input unit is used to provide a stable external input power to the charging management unit, the transformer power supply unit, and the fast charging module. The transformer power supply unit is used to process the voltage output by the charging management unit and then input it to the Bluetooth main control chip U1. The charging management unit is used to manage the charging and discharging of the Bluetooth speaker's built-in battery.

6. The outdoor Bluetooth speaker control circuit structure according to claim 5, characterized in that, The fast charging module includes a fast charging control chip U6, model IP6525T. Pin 7 of the fast charging control chip U6 serves as the power input terminal. Pin 7 of the fast charging control chip U6 is connected to a third diode D3. A forty-seventh capacitor CD47 and a forty-eighth capacitor CD48 are connected in parallel between the third diode D3 and pin 7 of the fast charging control chip U6. The forty-seventh capacitor CD47 and the forty-eighth capacitor CD48 are grounded after being connected in parallel to achieve input power filtering. Pin 8 of the fast charging control chip U6 is the VOUT fast charging output terminal, used to output fast charging energy to the outside.

7. The outdoor Bluetooth speaker control circuit structure according to claim 5, characterized in that, The audio module includes a power amplifier output unit and a power amplifier power supply unit. The power amplifier output unit and the power amplifier power supply unit are electrically connected to the Bluetooth main control chip U1, and the power amplifier power supply unit is electrically connected to the charging management unit. The power amplifier power supply unit is used to transform and convert the input power of the charging management unit and output it to the power amplifier output unit. The power amplifier output unit is used to amplify the audio signal of the Bluetooth main control chip U1 to drive the built-in speaker of the Bluetooth speaker.

8. The outdoor Bluetooth speaker control circuit structure according to claim 7, characterized in that, The audio module also includes an operational amplifier unit, which is connected between the power amplifier output unit and the Bluetooth main control chip U1. The operational amplifier unit is used to acquire audio signals from the built-in microphone of the Bluetooth speaker.

9. The outdoor Bluetooth speaker control circuit structure according to claim 7, characterized in that, The audio module also includes a mute circuit unit, which is connected between the power amplifier output unit and the Bluetooth master control chip U1. The mute circuit unit is used to isolate the electrical load between the Bluetooth master control module and the power amplifier output unit.

Images