Bluetooth sound box with dynamic voltage regulation

Abstract

A kind of Bluetooth sound with dynamic voltage regulation, including BOOST boost module and power amplifier, the output voltage of BOOST boost module supplies power amplifier, BOOST boost module includes synchronous boost controller U8, between the power amplifier and synchronous boost controller is equipped with inverter U9, the power amplifier detects audio input in real time, according to the signal swing to be output, the 5th foot output of power amplifier supplies voltage regulation signal BOOST_PWM, according to the voltage regulation signal BOOST_PWM received, the 18th foot of synchronous boost controller U8 dynamically adjusts output voltage by the feedback voltage detected.

Description

Technical Field

[0001] This utility model relates to the field of audio technology, and in particular to a Bluetooth speaker that uses dynamic voltage regulation. Background Technology

[0002] Many Bluetooth speakers on the market currently use boost circuits to increase battery voltage in order to boost power. When the battery voltage hasn't reached low-voltage protection, the boost circuit maintains a fixed output voltage. Some are even software-controlled, reducing the boost circuit's output voltage to a certain level when the battery voltage drops below a certain threshold. These designs cannot flexibly adjust the boost output voltage in real-time according to the amplifier's volume. Since the amplifier's efficiency decreases as the supply voltage increases, the boost circuit's efficiency also decreases with increasing output voltage, thus reducing battery efficiency. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a Bluetooth speaker that adopts dynamic voltage regulation, which can flexibly adjust the boost voltage in real time, save power, and extend battery life.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a Bluetooth speaker with dynamic voltage regulation, including a BOOST boost module and a power amplifier. The output voltage of the BOOST boost module supplies the power amplifier. The BOOST boost module includes a synchronous boost controller U8. An inverter U9 is provided between the power amplifier and the synchronous boost controller U8. The power amplifier detects the audio input in real time. According to the desired signal swing, the power amplifier outputs a power supply voltage adjustment signal BOOST_PWM at pin 5. The synchronous boost controller U8 dynamically adjusts the output voltage at pin 18 based on the received voltage adjustment signal BOOST_PWM and the detected feedback voltage.

[0005] As an improvement, the synchronous boost controller U8 is model LM5123-Q1, and the inverter U9 is model 74HC1G14.

[0006] As an improvement, pin 2 of inverter U9 is connected to pin 5 of power amplifier, and pin 4 of inverter U9 is connected to pin 18 of synchronous boost controller U8.

[0007] As an improvement, the positive terminal of the battery BAT outputs voltage through the MOSFET Q7, and pin 5 of the synchronous boost controller U8 is connected to the gate of the MOSFET Q7.

[0008] The beneficial effects of this utility model compared with the prior art are: By dynamically tracking the audio signal to adjust the power amplifier's supply voltage, the power amplifier always operates at near-optimal efficiency, greatly reducing power loss at medium and low volumes, thereby significantly extending the battery's single-charge usage time. Due to the increased efficiency, the heat generated by the power amplifier and power supply circuits is significantly reduced, improving the reliability and lifespan of the product, while also enhancing the user experience. At high volume or high dynamic range signals, the system can quickly boost the voltage to ensure that the power amplifier has sufficient voltage margin, avoid clipping distortion, and guarantee the quality of audio output. Complex functions can be achieved using the PWM signal generated by the power amplifier itself and standard boost controllers and inverters, without the need for additional dedicated dynamic voltage regulation chips. The circuit implementation is simple and the cost is controllable. Attached Figure Description

[0009] Figure 1 This is the circuit diagram for the BOOST boost module.

[0010] Figure 2 This is the circuit diagram for the power amplifier. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings.

[0012] like Figure 1 , 2 As shown, a Bluetooth speaker employing dynamic voltage regulation includes a BOOST boost module and a power amplifier. The output voltage of the BOOST boost module supplies the power amplifier. The BOOST boost module includes a synchronous boost controller U8, model LM5123-Q1. To improve stability, an inverter U9 is provided between the power amplifier and the synchronous boost controller U8 to adjust the timing; the inverter U9 is model 74HC1G14. Pin 2 of the inverter U9 is connected to pin 5 of the power amplifier, and pin 4 of the inverter U9 is connected to pin 18 of the synchronous boost controller U8. Power amplifiers U2 and U3 detect the audio input in real time. Based on the desired signal swing, pin 5 of the power amplifier outputs a supply voltage adjustment signal BOOST_PWM. The positive terminal of the battery BAT outputs voltage through a MOSFET Q7, and pin 5 of the synchronous boost controller U8 is connected to the gate of the MOSFET Q7.

[0013] The synchronous boost controller U8 dynamically adjusts the output voltage based on the received voltage adjustment signal BOOST_PWM and the detected feedback voltage at pin 18. Since audio signals typically have a high peak factor, the average power is only 40% or less of the peak power. BOOST_PWM enables dynamic tracking of the BOOST output voltage to the audio output amplitude, ensuring the BOOST output (i.e., the power amplifier supply voltage) remains at a precise level. This prevents clipping distortion due to insufficient boost output voltage while also avoiding reduced system efficiency due to excessively high boost output voltage, ensuring the entire audio system always operates at its optimal efficiency.

Claims

1. A Bluetooth speaker employing dynamic voltage regulation, comprising a BOOST boost module and a power amplifier, wherein the output voltage of the BOOST boost module supplies the power amplifier, characterized in that: The BOOST boost module includes a synchronous boost controller U8. An inverter U9 is provided between the power amplifier and the synchronous boost controller U8. The power amplifier detects the audio input in real time. According to the desired signal swing, the power amplifier outputs a power supply voltage adjustment signal BOOST_PWM at pin 5. The synchronous boost controller U8 dynamically adjusts the output voltage at pin 18 based on the received voltage adjustment signal BOOST_PWM and the detected feedback voltage.

2. A Bluetooth speaker employing dynamic voltage regulation according to claim 1, characterized in that: The synchronous boost controller U8 is model LM5123-Q1, and the inverter U9 is model 74HC1G14.

3. A Bluetooth speaker employing dynamic voltage regulation according to claim 2, characterized in that: Pin 2 of the inverter U9 is connected to pin 5 of the power amplifier, and pin 4 of the inverter U9 is connected to pin 18 of the synchronous boost controller U8.

4. A Bluetooth speaker employing dynamic voltage regulation according to claim 2, characterized in that: The positive terminal of the battery BAT outputs voltage through the MOSFET Q7, and pin 5 of the synchronous boost controller U8 is connected to the gate of the MOSFET Q7.

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