Digital power amplifier powered by single power supply

Abstract

The utility model discloses a digital power amplifier powered by a single power supply, and relates to the field of electronic equipment. The utility model relates to a power amplifier, which is composed of a digital signal input module, a pulse width modulation module, a power amplification module, a power conversion module, an output module and a load, the digital signal input module is connected with the pulse width modulation module, the pulse width modulation module is connected with the power amplification module, the power amplification module is connected with the output module, and the load is connected with the power conversion module. The power supply conversion module is connected with the pulse width modulation module and the power amplification module, and the output module processes signals after power amplification through a filter circuit and outputs the signals to load equipment. A single-power-supply power supply structure simplifies power supply management and reduces design complexity and cost; through a class D amplification technology and PWM control signal output, the energy utilization rate can be effectively improved, and power consumption can be reduced; as only a single power supply is needed for power supply and the circuit structure is simplified, the amplifier can be designed to be more compact and is suitable for portable and small equipment.

Description

Technical Field

[0001] The utility model relates to the field of electronic equipment, in particular to a digital power amplifier powered by a single power supply. Background Art

[0002] In existing technology, power amplifiers typically require dual power supplies, using positive and negative power supplies to provide different operating voltages for the amplifier circuitry. This complicates circuit design and increases costs. Dual-power supply systems typically require additional power management circuitry, which not only increases circuit complexity but also leads to increased size and energy loss. Therefore, simplifying power amplifier power supply design and improving efficiency has become a technical challenge in this field. Summary of the Invention

[0003] The purpose of this utility model is to design a digital power amplifier powered by a single power supply, which can achieve efficient and stable amplification under single power supply conditions by rationally designing the circuit structure, thus overcoming the complexity of dual power supply in the prior art.

[0004] The technical solution proposed in the utility model is implemented as follows: a digital power amplifier powered by a single power supply includes a digital signal input module, a pulse width modulation module, a power amplifier module, a power conversion module, an output module and a load, wherein the digital signal input module is connected to the pulse width modulation module, the pulse width modulation module is connected to the power amplifier module, the power amplifier module is connected to the output module, and the power conversion module is connected to the pulse width modulation module and the power amplifier module respectively; the power amplifier module includes a low-side driver, a field-effect transistor Q1, and a field-effect transistor Q2, wherein output 1 and output 2 of the low-side driver are connected to the G pole of the field-effect transistor Q1 and the G pole of the field-effect transistor Q2 respectively, the positive output end of the power conversion module is connected to the S pole of the field-effect transistor Q1, the ground of the power conversion module is connected to the S pole of the field-effect transistor Q2, and the D pole of the field-effect transistor Q1 is connected to the D pole of the field-effect transistor Q2. The pulse width modulation module includes an FPGA module, a Flash module, and an isolation module. The FPGA is connected to the Flash storage module that stores its modulation function and control logic program. The IO output terminal of the FPGA that outputs two switching signals is connected to the input terminal of the isolation module. Output 1 and output 2 of the isolation module are respectively connected to input 1 and input 2 of the low-side driver in the power amplifier module. The power conversion module includes a 220V AC power input terminal, an AC / DC module for converting the 220V input AC power into a positive output, an LDO module connected to the positive power, and a ground terminal. The positive output terminal is connected to the S pole of the field effect transistor Q1 in the power amplifier module. The output terminal of the LDO module is connected to the working power input terminal of the FPGA in the pulse width modulation module, and the ground terminal is connected to the S pole of the field effect transistor Q2. The digital signal input module includes an I / O module for receiving and pre-processing external digital audio signals or serial digital stream signals. 2 S module, I 2 The output of the S module is connected to the IO input of the FPGA in the pulse-width modulation module, which manages the data flow and control logic of the entire system. The output module includes inductor L1 and capacitor C1. One end of inductor L1 is connected to the D terminals of field-effect transistors Q1 and Q2, and the other end is connected to capacitor C1. The other end of capacitor C1 is grounded. The connection between inductor L1 and capacitor C1 serves as the output terminal and is connected to the load.

[0005] The single-power-supply digital power amplifier provided by the utility model simplifies power supply design and power management, does not require a negative voltage circuit, and reduces design complexity and cost; achieves efficient energy utilization: through Class-D amplification technology and PWM control signal output, it can effectively improve energy utilization and reduce power consumption; and is adaptable to miniaturized design: because it only requires a single power supply and simplifies the circuit structure, the amplifier can be designed to be more compact and suitable for portable and small devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 Block diagram of a digital power amplifier design operating from a single supply.

[0007] Figure 2 This is a connection diagram of the digital signal input, pulse width modulation circuit and power conversion module.

[0008] Figure 3 This is a connection diagram of the power amplifier circuit, output module, load and power conversion module.

[0009] In the figure: 100: digital signal input module; 200: pulse width modulation module, 300: power amplifier module, 400: power conversion module, 500: output module, 600: load. FPGA: field programmable gate array; Flash: flash memory; LDO: low dropout linear regulator; I 2 S module: meet I 2 S protocol digital audio conversion module; AC-DC: a power conversion module that converts 220V input AC power into DC positive output; Q1, Q2: field-effect transistors; L1: inductor; C1: capacitor. DETAILED DESCRIPTION

[0010] The technical solutions and advantages of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0011] like Figure 1 FIG. 1 is a block diagram of a single-power-supply digital power amplifier of this embodiment, comprising a digital signal input module 100 , a pulse width modulation module 200 , a power amplification module 300 , a power conversion module 400 , an output module 500 , and a load device 600 (such as a speaker or a signal receiver).

[0012] The digital signal input module 100 is connected to the pulse width modulation module 200 and is used to receive an external digital audio signal or serial digital stream signal. After the preprocessing module performs noise elimination and signal enhancement, an input signal suitable for amplification is generated. The pulse width modulation module 200 is connected to the power amplifier module 300 and is used to convert the preprocessed digital signal into a pulse width modulation signal (PWM). The PWM module adjusts the width of the output pulse according to the amplitude change of the input signal to achieve the corresponding power amplification effect. The power amplifier module 300 is connected to the output module 500 and is used to amplify the PWM signal and increase the signal power to the target level. This module adopts an efficient switching mode design and uses low-power components such as field-effect transistors (FETs) to reduce switching loss and conduction loss. The output module 500 processes the power-amplified signal through a filtering circuit to eliminate high-frequency noise and interference, ensure the purity and stability of the output signal, and finally output it to the load device 600.

[0013] In one embodiment, Figure 2 As shown, a method for implementing the digital signal input module 100, the pulse width modulation module 200, and the power conversion module 400 includes: I 2 S module, FPGA module, Flash module, isolation module, and power conversion module, I 2 The output of the S module is connected to the IO inside the FPGA to realize the transmission and processing of audio data. The input of the FPGA is connected to the I 2 The output of the S module is connected, the FPGA is connected to the Flash module and the isolation module, the working power input of the FPGA is connected to the power conversion module, and the FPGA is responsible for managing the data flow and control logic of the entire system. 2 The digital audio signal output by the S module is modulated to generate a corresponding switching signal. The Flash module is connected to the FPGA module and is responsible for storing the FPGA modulation function and control logic program. The isolation module is connected to the FPGA module and is used to receive the two switching signals output by the internal IO of the FPGA and output the corresponding isolated output 1 and output 2. The input end of the power conversion module 400 is connected to the 220V AC, and the positive power is converted by the AC / DC module. The output end of the positive power is connected to the LDO module, and the output end of the LDO is connected to the FPGA to provide the power supply required by the FPGA.

[0014] In one embodiment, Figure 3 As shown, a method for implementing a power amplifier circuit composed of the power amplifier module 300, the power conversion module 400, and the output module 500 is provided, which includes a low-side driver, a field-effect transistor Q1, a field-effect transistor Q2, an inductor L1, and a capacitor C1. The low-side driver module includes an input 1 and an input 2, which are respectively connected to the output 1 and the output 2 of the isolation module; the low-side driver module provides corresponding output 1 and output 2, and output 1 and output 2 are a pair of square wave signals in the same direction with dead time. Output 1 is connected to the G pole of the field-effect transistor Q1, and output 2 is connected to the G pole of the field-effect transistor Q2. The positive output terminal of the power conversion module 400 is connected to the S pole of the power tube Q1 to provide single power supply; the ground of the power conversion module 400 is connected to the S pole of the field-effect transistor Q2. The G terminal of field-effect transistor Q1 is connected to output 1 of the low-side driver, the S terminal is connected to the positive output terminal of the power module, and the D terminal is connected to the D terminal of field-effect transistor Q2. The G terminal of field-effect transistor Q2 is connected to output 2 of the low-side driver, the D terminal is connected to the D terminal of field-effect transistor Q1, and the S terminal is connected to the ground of the power conversion module. One end of inductor L1 is connected to the D terminals of field-effect transistors Q1 and Q2, and the other end is connected to one end of capacitor C1. One end of the capacitor is connected to one end of inductor L1, and the other end is connected to ground. The connection between inductor L1 and capacitor C1 serves as an output terminal and is connected to load 600.

Claims

1. A single-power-supply digital power amplifier, comprising a digital signal input module, a pulse width modulation module, a power amplification module, a power conversion module, an output module, and a load, characterized in that: The digital signal input module is connected to the pulse width modulation module, the pulse width modulation module is connected to the power amplifier module, the power amplifier module is connected to the output module, and the power conversion module is connected to the pulse width modulation module and the power amplifier module respectively; the power amplifier module includes a low-side driver, a field-effect transistor Q1, and a field-effect transistor Q2, the output 1 and output 2 of the low-side driver are connected to the G pole of the field-effect transistor Q1 and the G pole of the field-effect transistor Q2 respectively, the positive output end of the power conversion module is connected to the S pole of the field-effect transistor Q1, the ground of the power conversion module is connected to the S pole of the field-effect transistor Q2, and the D pole of the field-effect transistor Q1 is connected to the D pole of the field-effect transistor Q2.

2. The single-power-supply digital power amplifier according to claim 1, wherein: The pulse width modulation module includes an FPGA module, a Flash module, and an isolation module. The FPGA is connected to the Flash storage module that stores its modulation function and control logic program. The IO output terminal of the FPGA outputting two switching signals is connected to the input terminal of the isolation module. Output 1 and output 2 of the isolation module are respectively connected to input 1 and input 2 of the low-side driver in the power amplifier module.

3. The single-power-supply digital power amplifier according to claim 1, wherein: The power conversion module includes a 220V AC power input terminal, an AC / DC module for converting the 220V input AC power into a positive power output, an LDO module connected to the positive power, and a ground terminal. The positive power output terminal is connected to the S pole of the field effect transistor Q1 in the power amplifier module. The output terminal of the LDO module is connected to the working power input terminal of the FPGA in the pulse width modulation module, and the ground terminal is connected to the S pole of the field effect transistor Q2.

4. The single-power-supply digital power amplifier according to claim 1, wherein: The digital signal input module includes an I / O module for receiving an external digital audio signal or a serial digital stream signal and performing pre-processing. 2 S module, I 2 The output of the S module is connected to the IO input of the FPGA in the pulse width modulation module, which manages the data flow and control logic of the entire system.

5. The single-power-supply digital power amplifier according to claim 1, wherein: The output module includes an inductor L1 and a capacitor C1. One end of the inductor L1 is connected to the D electrodes of the field effect transistor Q1 and the field effect transistor Q2, and the other end is connected to the capacitor C1. The other end of the capacitor C1 is grounded. The connection end of the inductor L1 and the capacitor C1 is connected to the load as the output end.

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