CN213043809U

CN213043809U - Active audio amplifier circuit of USB bluetooth integration

Info

Publication number: CN213043809U
Application number: CN202021608543.9U
Authority: CN
Inventors: 张太武
Original assignee: Iag Group Co ltd
Current assignee: IAG Group Ltd
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2021-04-23
Anticipated expiration: 2030-08-04

Abstract

The utility model provides an active audio amplifier circuit of USB bluetooth integration belongs to audio amplifier circuit field. The utility model discloses a USB interface, bluetooth chip main part, bluetooth power module and storage module, wherein, the output of USB interface links to each other with bluetooth chip main part input, bluetooth power module does bluetooth chip main part and USB interface provide the power, bluetooth chip main part is connected with storage module. The utility model has the advantages that: the USB flash disk can be connected with Bluetooth and a USB (universal serial bus) flash disk, can be connected with a computer through a USB interface, and can adjust various parameters of a Bluetooth chip, and has simple structure and low cost.

Description

Active audio amplifier circuit of USB bluetooth integration

Technical Field

The utility model relates to a speaker circuit especially relates to an active speaker circuit of USB bluetooth integration.

Background

The bluetooth speaker is a speaker that actually uses bluetooth transmission protocol as a carrier to transmit data, and most mobile devices (mobile phones, notebooks, and tablet computers) have bluetooth chips, so that the mobile devices can be quickly identified without data lines or audio lines, and the bluetooth speaker is simple in operation and convenient to connect. The Bluetooth sound box applies the Bluetooth technology to the traditional digital and multimedia sound box, so that a user can avoid annoying wiring stumbling and listen to music freely in various modes.

USB, an abbreviation for Universal Serial Bus (USB), is an external Bus standard used to standardize the connection and communication between computers and external devices. The USB has the advantages of high transmission speed, convenience in use, support for hot plug, flexibility in connection, independent power supply and the like, and can be connected with various peripherals such as a keyboard, a mouse, a large-capacity storage device and the like. USB employs a four-wire cable, two of which are serial channels for transmitting data, and two of which provide power to Downstream (Downstream) devices, and for any peripheral devices that have been successfully connected and that are identified to each other, will transmit data at the highest rate that both devices can support. The USB bus can automatically switch from high speed to low speed dynamically in a compatible transmission mode according to the peripheral condition and is matched and locked at a proper speed.

The active sound box is connected in a wired mode in the early stage, and is connected with a sound source through ports such as RCA/TRS/XLR and the like, along with the development of IT technology, a USB interface appears, and accordingly a computer is generally applied. Due to the adoption of the U disk, the sound source can be connected with the active sound box in a carrier mode, the constraint of wired connection is broken, the USB interface is more convenient to move, and the USB interface is popularized in the application of the active sound box. The appearance of bluetooth, based on low-cost closely wireless connection, connect through the bluetooth, make the connection of sound source and active audio amplifier more convenient. However, the bluetooth module in the prior art cannot be compatible with the USB interface, and needs to set an independent USB processing circuit, so that the structure is complex and the cost is high.

SUMMERY OF THE UTILITY MODEL

For solving the problem among the prior art, the utility model provides an active audio amplifier circuit of USB bluetooth integration.

The utility model discloses a USB interface, bluetooth chip main part, bluetooth power module and storage module, wherein, the output of USB interface links to each other with bluetooth chip main part input, bluetooth power module does bluetooth chip main part and USB interface provide the power, bluetooth chip main part is connected with storage module.

The utility model discloses make further improvement, the bluetooth chip main part includes bluetooth chip U2, bluetooth chip U2 adopts the bluetooth chip BT-2815 of domestic moment power.

The utility model discloses do further improvement, bluetooth chip U2's 9 feet DP connects 2 feet D +,10 feet DM connects the 3 feet D-of USB interface, bluetooth chip U2's 14, 15, 16 feet are SPI serial peripheral interface, external storage module, wherein 1 foot of storage IC AT25Q80 is connected to 14 feet SPI _ SS, is CS chip selection control signal, 15 feet SPI _ MOSI connects 5 feet of storage IC AT25Q80, is the data transmission passageway, 16 feet SPI _ CLK connects 6 feet of storage IC AT25Q80, is clock signal, 24 feet of bluetooth chip U2 pass through the external SW button 101 that triggers of

resistance

5, 25 feet and 26 feet of bluetooth chip U2 are audio output LOUT and ROUT, 23 feet BAT of bluetooth chip U2 connects bluetooth power supply module.

The utility model discloses make further improvement, more than 1 function control button SW1 is still connected to bluetooth chip U2's 20 feet, wherein, function control button SW 1's 1 foot ground connection, 2 feet pass through resistance 34 and link to each other with power and bluetooth chip U2's 20 feet respectively.

The utility model discloses make further improvement, bluetooth power module includes step-down chip U7, step-down chip U7 has 4V-36V's wide input direct current voltage, can bear input direct current voltage 36 and put down, and maximum output current is 3A.

The utility model discloses make further improvement, step-down chip U7's 7 feet are power supply input voltage, 1 foot output voltage, and 4 feet are equipped with parameter adjustment circuit for adjust 1 foot output voltage.

The utility model discloses make further improvement, parameter adjustment circuit includes resistance R55A, R57A, R59A, wherein, resistance R55A, R57A, R59A's one end links to each other with the 7 feet of step-down chip U7 respectively, resistance R55A, R59A's the other end links to each other with 1 foot of step-down chip U7, resistance R57A's other end ground connection.

The utility model discloses do further improvement, still include power amplification module, volume control module, tone processing module, frequency division module and the power amplifier module that sets gradually according to the signal flow direction, wherein, the frequency division module falls into HPF and LPF signal with audio signal, provides the power amplifier module of back level, and the HPF signal after enlarging connects high pitch horn TWEETER, and the LPF signal connects WOOFER WOOFER.

The utility model discloses make further improvement, still include wired signal input interface, the output of wired signal input interface links to each other with power amplification module input.

The utility model discloses make further improvement, wired signal input interface includes INPUTA and INPUTB, wherein, INPUTA is XLR TRS connection port, and INPUTB is TRS RCA connection port.

Compared with the prior art, the beneficial effects of the utility model are that: the Bluetooth is connected with the USB interface compatible with the Bluetooth module, can be connected with Bluetooth and a USB flash disk, can be connected with a computer through the USB interface, and can adjust various parameters of a Bluetooth chip, and has simple structure and low cost.

Drawings

FIG. 1 is a schematic circuit diagram of a USB interface, a Bluetooth chip main body and a memory module;

FIG. 2 is a schematic circuit diagram of a Bluetooth power module;

fig. 3 is a block diagram of the overall circuit of the active speaker.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 3, the utility model discloses the audio amplifier circuit includes signal input module, power amplification module 1, volume control module 6, tone processing module 7, frequency division module 8 and power amplifier module 9 that set gradually according to the signal flow direction, wherein, frequency division module 8 falls into HPF and LPF signal with audio signal, provides the power amplifier module 9 of back level, and the HPF signal after the amplification connects high pitch horn angle EETER, and the LPF signal connects WOOFER WOOFER.

The signal input module of the embodiment comprises a wired connection interface, a Bluetooth chip main body 5 and a USB interface 4 connected with the input end of the Bluetooth chip main body, wherein the wired signal input interface comprises an INPUTA interface 2 and an INPUTB interface 3, the INPUTA interface 2 is an XLR/TRS connection port, and the INPUTB interface is a TRS/RCA connection port. The Bluetooth chip main body 5 provides Bluetooth wireless connection, a BT (Bluetooth) signal is conveniently connected with the sound source in a wireless mode, the USB interface 4 can be connected with a USB (universal serial bus) flash disk to read music signals in the USB flash disk and can also be connected with a computer, and a program edited by the computer can be directly burnt into the USB flash disk conveniently through the USB port.

The working principle of the embodiment is as follows:

the sound source signal received by RCA/TRS/XLR port, the sound source signal received by USB/blue tooth, after the amplification by power amplification module 1, through volume adjustment module 6, tone processing module 7, frequency division module 8, divide into HPF and LPF signal, HPF and HPF signal connect the following high pitch horn TWEETER and WOOFER WOOFER after amplifying respectively by power amplification module 9.

As shown in fig. 1, the USB/bluetooth input module of this embodiment includes a USB interface, a bluetooth chip main body, a bluetooth power module, and a storage module, wherein an output terminal of the USB interface is connected to an input terminal of the bluetooth chip main body, the bluetooth power module provides power for the bluetooth chip main body and the USB interface, and the bluetooth chip main body is connected to the storage module.

The Bluetooth chip main body comprises a Bluetooth chip U2, and the Bluetooth chip U2 adopts a domestic moment Bluetooth chip BT-2815. The 9-pin DP of the Bluetooth chip U2 is connected with the 2-pin D + of the USB interface, and the 10-pin DM is connected with the 3-pin D-of the USB interface, so that the connection is simple and visual.

The 14, 15 and 16 pins of the Bluetooth chip U2 are SPI serial peripheral interfaces and are connected with an SPI interface serial Flash memory IC AT25Q80, wherein the 14 pin SPI _ SS is connected with 1 pin of the memory IC AT25Q80 and is a CS chip selection control signal, the 15 pin SPI _ MOSI is connected with 5 pins of the memory IC AT25Q80 and is a data transmission channel, the 16 pin SPI _ CLK is connected with 6 pins of the memory IC AT25Q80 and is a clock signal, the 24 pin of the Bluetooth chip U2 is externally connected with a trigger key SW101 through a resistor 5, the 23 pin BAT of the Bluetooth chip U2 is connected with the Bluetooth power supply module, the 25 pin and the 26 pin of the Bluetooth chip U2 are audio output ends LOUT and ROUT, output signals are connected to a loudspeaker after being processed, and the loudspeaker can listen to wonderful music.

When connecting the power, press the switch for a long time and trigger more than the button SW 1012 seconds, bluetooth chip U2 triggers, gets into operating condition, and this product core function is: firstly, Bluetooth signals of external equipment such as a mobile phone, a computer and the like can be directly connected with Bluetooth to play music; external equipment such as a USB flash disk can be connected through a USB interface to play music; thirdly, the USB interface can be connected with a computer, and the program and the editing parameters can be revised again through the computer and input into the Flash storage IC AT25Q80, so that the Bluetooth chip can be output in a required mode, and the method is very convenient.

In this example, the 20 pins of the bluetooth chip U2 are further connected to 2 function control keys SW1 and SW2, wherein pins 1 of the function control keys SW1 and SW2 are respectively grounded, and pins 2 are respectively connected to the power supply and the 20 pins of the bluetooth chip U2 through resistors.

As shown in FIG. 2, the Bluetooth power supply module of this embodiment includes a voltage-reducing chip U7, and the voltage-reducing chip U7 employs ETA2822 voltage-reducing IC of Yutai technology, which is selected because it has a wide input DC voltage of 4V-36V, can withstand an input DC voltage of 36V, has a maximum output current of 3A, and employs a general ESOP-8 package.

The pin 7 of the buck chip U7 in this example is the power supply input voltage, pin 1 output voltage, and pin 4 is provided with a parameter adjusting circuit for adjusting the pin 1 output voltage. The parameter adjusting circuit comprises resistors R55A, R57A and R59A, wherein one ends of the resistors R55A, R57A and R59A are respectively connected with a pin 7 of a voltage reduction chip U7, the other ends of the resistors R55A and R59A are connected with a pin 1 of a voltage reduction chip U7, and the other end of the resistor R57A is grounded.

The direct-current voltage output by the pin 1 of the voltage-reducing chip U7 in fig. 1 after passing through the inductor LIA is 4.93 v, and the formula is VOUT ═ 0.8 (R57A + R55A/R59A)/R57A).

The utility model discloses a bluetooth that the user provided connects and is compatible with bluetooth module's USB interface, joinable bluetooth, USB flash disk to can adjust the various parameters of bluetooth module circuit through the USB interface connection computer.

The circuit design is novel, succinct high-efficient small and exquisite, has not only kept traditional RCA/TRS/XLR port and has connected the sound source through wired connection mode, has USB/bluetooth connected mode to put through the sound source moreover, and USB can also be connected with the computer simultaneously, and the programmable characteristic of application memory IC AT25Q80 is revised the procedure, then directly burns in the form through the USB port, and is very convenient.

The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides an active audio amplifier circuit of USB bluetooth integration which characterized in that: the Bluetooth device comprises a USB interface, a Bluetooth chip main body, a Bluetooth power supply module and a storage module, wherein the output end of the USB interface is connected with the input end of the Bluetooth chip main body, the Bluetooth power supply module supplies power to the Bluetooth chip main body and the USB interface, and the Bluetooth chip main body is connected with the storage module.

2. The USB Bluetooth integrated active speaker circuit of claim 1, wherein: the Bluetooth chip main body comprises a Bluetooth chip U2, and the Bluetooth chip U2 adopts a domestic moment Bluetooth chip BT-2815.

3. The USB Bluetooth integrated active speaker circuit of claim 2, wherein: the 9-pin DP of the Bluetooth chip U2 is connected with the 2-pin D + of the USB interface, the 10-pin DM is connected with the 3-pin D-of the USB interface, 14, 15 and 16 pins of the Bluetooth chip U2 are SPI serial peripheral interfaces and are externally connected with a storage module, the storage module comprises a storage IC AT25Q80, wherein the 14-pin SPI _ SS is connected with the 1 pin of the storage IC AT25Q80 and is a CS chip selection control signal, the 15-pin SPI _ MOSI is connected with the 5 pins of the storage IC AT25Q80 and is a data transmission channel, the 16-pin SPI _ CLK is connected with the 6 pins of the storage IC AT25Q80 and is a clock signal, the 24 pin of the Bluetooth chip U2 is externally connected with a trigger key SW101 through a resistor R5, the 25 pin and the 26 pin of the Bluetooth chip U2 are audio output terminals LOUT and ROUT, and the 23-pin BAT of the Bluetooth chip U2 is.

4. The USB Bluetooth integrated active speaker circuit of claim 3, wherein: more than 1 function control key SW1 is also connected to 20 feet of the Bluetooth chip U2, wherein, 1 foot of the function control key SW1 is grounded, and 2 feet are respectively connected with a power supply and 20 feet of the Bluetooth chip U2 through a resistor R34.

5. The USB Bluetooth integrated active speaker circuit of claim 1, wherein: the Bluetooth power supply module comprises a voltage reduction chip U7, wherein the voltage reduction chip U7 has a wide input direct current voltage of 4V-36V, can bear 36V of the input direct current voltage, and has a maximum output current of 3A.

6. The USB Bluetooth integrated active speaker circuit of claim 5, wherein: the 7 th pin of the voltage reduction chip U7 is power supply input voltage, 1 pin output voltage, and 4 pins are provided with a parameter adjusting circuit for adjusting the 1 pin output voltage.

7. The USB Bluetooth integrated active speaker circuit of claim 6, wherein: the parameter adjusting circuit comprises resistors R55A, R57A and R59A, wherein one ends of the resistors R55A, R57A and R59A are respectively connected with a pin 7 of a voltage reduction chip U7, the other ends of the resistors R55A and R59A are connected with a pin 1 of a voltage reduction chip U7, and the other end of the resistor R57A is grounded.

8. The USB Bluetooth integrated active speaker circuit as claimed in any one of claims 1 to 7, wherein: the system also comprises a power amplification module, a volume adjustment module, a tone processing module, a frequency division module and a power amplification module which are sequentially arranged according to the signal flow direction, wherein the frequency division module divides the audio signal into HPF and LPF signals and provides the HPF and LPF signals for the power amplification module at the later stage, the amplified HPF signal is connected with a high-pitch horn TWEETER, and the LPF signal is connected with a WOOFER WOOFER.

9. The USB and bluetooth integrated active speaker circuit of claim 8, wherein: the output end of the wired signal input interface is connected with the input end of the power amplification module.

10. The USB and bluetooth integrated active speaker circuit of claim 9, wherein: the wired signal input interface comprises an INPUTA and an INPUTB, wherein the INPUTA is an XLR/TRS connection port, and the INPUTB is a TRS/RCA connection port.