300W gallium nitride belt DSP amplification circuit

Abstract

A 300W gallium nitride belt DSP amplification circuit comprises an input selection circuit, an ADC circuit and a power amplification circuit. The input selection circuit comprises an analog switch chip U02 and an analog switch chip U03, and a line and a DANTE signal convert control voltage through a twelfth pin and a thirteenth pin of the analog switch chip U02 and the analog switch chip U03 to form a truth table to meet switching; the ADC circuit comprises an audio converter chip U2, and the switched analog audio signal is converted into a digital signal through the audio converter chip U2; the power amplifier circuit comprises a monaural gallium nitride D-type power amplifier chip U3, a digital signal is subjected to power amplification after I2S communication through a third pin, a fourth pin and a fifth pin of the monaural gallium nitride D-type power amplifier chip U3, and a ninth pin and a tenth pin of the monaural gallium nitride D-type power amplifier chip U3 are respectively communicated with a PC I2C for DSP tuning.

Description

Technical Field

[0001] This invention relates to the field of audio power amplification technology, specifically to a high-efficiency Class D amplifier circuit based on gallium nitride (GaN) devices and a digital signal processor (DSP), suitable for professional audio systems, broadcasting systems, and other scenarios requiring high power output and intelligent audio processing. Background Technology

[0002] Currently, most digital power amplifiers use Class D, which is a significant improvement in efficiency compared to the previous AB power amplifiers, but the efficiency is still only around 70%. In addition, Class D power amplifiers require sufficient power supply and heat sink support to operate. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a 300W gallium nitride amplifier circuit with DSP, which has a simple peripheral circuit, is easy to debug with DSP, does not require a heat sink, reduces power consumption, and lowers cost.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a 300W gallium nitride (GaN) amplifier circuit with DSP, including an input selection circuit, an ADC circuit, and a power amplifier circuit; the input selection circuit includes analog switch chips U02 and U03, and the line and the DANTE signal are controlled by the voltage transformation through pins 12 and 13 of analog switch chips U02 and U03 to form a truth table to satisfy the switching; the ADC circuit includes an audio converter chip U2, and the switched analog audio signal is converted into a digital signal through the audio converter chip U2; the power amplifier circuit includes a mono GaN Class D power amplifier chip U3, and the digital signal is amplified after I2S communication through pins 3, 4, and 5 of the mono GaN Class D power amplifier chip U3, and pins 9 and 10 of the mono GaN Class D power amplifier chip U3 communicate with PC I2C for DSP tuning.

[0005] As an improvement, the analog switch chip U02 and analog switch chip U03 are model number 14052B, the audio converter chip U2 is model number HT91808, and the mono gallium nitride Class D power amplifier chip U3 is model number ACM8816.

[0006] As an improvement, pin 6 of the mono gallium nitride Class D power amplifier chip U3 is connected to the RCH warning indicator, and pin 7 of the mono gallium nitride Class D power amplifier chip U3 is connected to the RCH fault indicator.

[0007] The beneficial effects of this utility model compared with the prior art are:

[0008] Power amplifier ICs made of gallium nitride (GaN) have a simple peripheral circuit and are easy to debug with DSP. They also eliminate the need for heat sinks, reducing power consumption and lowering costs. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the input selection circuit.

[0010] Figure 2 This is a schematic diagram of an ADC circuit.

[0011] Figure 3 This is a schematic diagram of a power amplifier circuit. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] like Figures 1 to 3 As shown, a 300W gallium nitride (GaN) amplifier circuit with DSP includes an input selection circuit, an ADC circuit, and a power amplifier circuit. The signal flow is: input signal → switching → analog-to-digital conversion → digital power amplifier → output. The input selection circuit includes analog switch chips U02 and U03, model number 14052B. The line signal and the DANTE signal are controlled by the voltage transformation between pins 12 and 13 of analog switch chips U02 and U03, forming a truth table to satisfy the switching. Dual analog switch chips are used to switch between the line signal and the DANTE network audio signal, and the logic selection is completed by generating a truth table through the control voltage. The ADC circuit includes an audio converter chip U2, model number HT91808. The switched analog audio signal is converted into a digital signal by the audio converter chip U2. The power amplifier circuit includes a mono GaN Class D power amplifier chip U3, model ACM8816; digital signals are amplified after I2S communication via pins 3, 4, and 5 of the mono GaN Class D power amplifier chip U3; pins 9 and 10 of the mono GaN Class D power amplifier chip U3 communicate with PC I2C for DSP tuning; pin 6 of the mono GaN Class D power amplifier chip U3 is connected to an RCH warning indicator, and pin 7 of the mono GaN Class D power amplifier chip U3 is connected to an RCH fault indicator.

[0014] Power amplifier ICs made of gallium nitride (GaN) have a simple peripheral circuit and are easy to debug with DSP. They also eliminate the need for heat sinks, reducing power consumption and lowering costs.

Claims

1. A 300W gallium nitride amplifier with DSP amplification circuit, characterized in that: Including input selection circuit, ADC circuit and power amplifier circuit;The input selection circuit includes analog switch chip U02 and analog switch chip U03, and the line is changed control voltage with the 12th foot and the 13th foot of analog switch chip U02 and analog switch chip U03 by DANTE signal, forms truth table, satisfies switching;The ADC circuit includes audio converter chip U2, and the analog audio signal after switching is converted into digital signal by audio converter chip U2;The power amplifier circuit includes single-channel gallium nitride D class power amplifier chip U3, and the digital signal is amplified in power after I2S communication by single-channel gallium nitride D class power amplifier chip U3 3rd foot, 4th foot and 5th foot, and single-channel gallium nitride D class power amplifier chip U3 9th foot and 10th foot are respectively with PC I2C communication and carry out DSP tuning.

2. The 300W gallium nitride amplifier circuit with DSP according to claim 1, characterized in that: The model of analog switch chip U02 and analog switch chip U03 is 14052B, the model of audio converter chip U2 is HT91808, and the model of single-channel gallium nitride D class power amplifier chip U3 is ACM8816.

3. The 300W gallium nitride amplifier circuit with DSP according to claim 1, characterized in that: The 6th foot of single-channel gallium nitride D class power amplifier chip U3 is connected with RCH warning indicator light, and the 7th foot of single-channel gallium nitride D class power amplifier chip U3 is connected with RCH fault indicator light.

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