⚡ 本页包含 AI 生成的分析内容，仅供参考
本文提出了一种集成80V 45W的D类功率放大器，通过最优效率跟踪的开关频率调节技术，在全输出功率范围内实现高效率。主要解决了压电致动器驱动中高压大功率放大器效率随输出功率变化而下降的问题。
Piezoelectric actuators are widely used in smart materials for vibration and noise control, precision actuators, etc. [1]. These actuators are largely capacitive and the reactive power applied on them can go to several tens of Watts. Highvoltage, high-power class-D amplifiers [2]-[5] are ideal drivers for such loads, because of their high power efficiency. Preferably, efficiency should be high both at maximum power and at average output power. Obtaining high power efficiency over the full output power range of a class-D amplifier is the main focus of this work. Figure 17.1.1 shows a typical high-voltage class-D power stage, where two identical n-type DMOS FETs are used as both high-side (HS) and low-side (LS) power switches with their gate-driver supply voltage VDD being much lower than VDDP [2]-[5]. The three main dissipation sources in the power stage are then: 1) Conduction loss Pcon caused by the output current Iout due to ron switch
Haifeng Ma, Ronan van der Zee, Bram Nauta
University of Twente, Enschede, The Netherlands