设计了一种基于A/D和D/A相互转换的音频功率放大器。A/D转换后的数字音频信号经电平匹配和隔离驱动后,控制功率D/A转换电路进行音频还原和功率放大。当转换位数足够时,能基本不失真地还原音频信号。对功率D/A转换输出的阶梯波进行逐级分析,得出开关器件工作频率、器件通态损耗和开关损耗的计算式。利用多级自举方法,减少了驱动电源数目。实验结果表明,这是一种效率较高的音频功率放大器。 An audio power amplifier based on A / D conversion and D / A conversion is designed. The A / D converted digital audio signal is level-matched and isolated and driven to control the power D / A conversion circuit for audio reduction and power amplification. When the number of conversion bits is sufficient, the audio signal can be restored without any distortion. Stepped-wave analysis of the power D / A conversion output step-by-step analysis of the operating frequency of the switching device, the device on-state loss and switching losses of the formula. The use of multi-level bootstrap method, reducing the number of drive power. Experimental results show that this is a more efficient audio power amplifier.