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本文提出了一种采用折叠PWM技术的多电平Class-D音频放大器，解决了传统H桥结构在高功率音频系统中电磁干扰严重和效率低下的问题。该放大器在8Ω负载下实现10W输出，效率高达91%，THD+N仅为0.0023%。
Yeunhee Huh, Kye-Seok Yoon, Jong-Beom Baek, Yong-Min Ju, Gibbeum Lee, Homin Park, Hyeon-Min Bae, Gyu-Hyeong Cho KAIST, Daejeon, Korea As the portable device market tries to enhance user experience, high-power audio systems with boosted supply voltage have been the main design focus recently. Several past works have addressed issues related to boosted supply voltages [1,2]. Nevertheless, the power stage retained the classical H-bridge structure in the previous works, which resulted in aggravated electromagnetic interference (EMI) from high switching amplitude and poor efficiency due to voltage boosting. The use of multi-level pulse-width modulation (PWM) shown in Fig. 5.2.1 can naturally eliminate the complications caused by high supply voltages. Since the audio signal has a high crest factor, a multi-level Class-D amplifier draws most power directly from a low-voltage battery source, which in turn improves the
Ji-Hun Lee, Jun-Suk Bang, Ki-Duk Kim, Hui-Dong Gwon, Sang-Hui Park,