⚡ 本页包含 AI 生成的分析内容，仅供参考
该论文提出了一种智能扬声器驱动系统，集成Class-D音频放大器、DC-DC升压转换器、电流感测ADC和DSP，以在便携设备中最大化声学输出同时保护扬声器免受损坏。通过自适应算法监测音圈温度和振膜偏移，实现了4Ω负载下2.3W的输出功率。
higher audio output power. This can be achieved by lowering the speaker impedance or increasing the voltage swing at the amplifier output by boosting the supply voltage [1-4]. Typical speakers in portable devices are quite fragile and can be damaged easily when the voice coil temperature or membrane excursion exceeds the rated limits. This work presents a smart speaker driver system that maximizes acoustic output while ensuring the speaker is not damaged. Figure 10.5.1 shows a block diagram. A digital interface that translates I2S audio input into digital PWM is followed by an accurate DAC and a high-efficiency BDmodulated class-D audio amplifier with a 2nd-order closed-loop direct-PWM architecture [5]. For maximum output power the class-D amplifier is supplied by
DC-DC Boost Converter, Current-Sensing ADC and, DSP for Adaptive Speaker Protection
Marco Berkhout, Lutsen Dooper, Benno Krabbenborg, John Somberg NXP Semiconductors, Nijmegen, The Netherlands The trend in portable devices such as smart phones and tablets is towards