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1. 发明申请

WO2015059471A1 CLASS-D AMPLIFIER CIRCUITS 审中-公开
标题翻译： CLASS-D放大器电路
公开(公告)号：WO2015059471A1
公开(公告)日：2015-04-30
申请号：PCT/GB2014/053150
申请日：2014-10-22
申请人： WOLFSON MICROELECTRONICS LTD
发明人： LESSO, John Paul , IDO, Toru
IPC分类号： H03F3/217
CPC分类号： H03F3/2171 , H03F1/0211 , H03F3/187 , H03F3/217 , H03F2200/165 , H03F2200/171 , H03F2200/333 , H03F2200/351 , H03G1/0088
摘要： This application describes methods and apparatus for Class-D amplifier circuits (300) with improved power efficiency. The circuit has an output stage (102) with at least first and second switches and a modulator (104) that receives an input signal to be amplified, S IN , and a first clock signal f SW . The modulator controls the duty cycles of the first and second switches, within a switching cycle based on the input signal, wherein the switching cycle has a switching frequency based on the first clock signal. A frequency controller (301) controls the frequency of the first clock signal in response to an indication of the amplitude of the input signal so as to provide a first switching frequency at a first input signal amplitude and a second, lower, switching frequency at a second, lower, input signal amplitude. A lower switching frequency can be tolerated at low signal amplitudes and varying the switching frequency in this way thus maintains stability whilst reducing switching power losses.
摘要翻译：本申请描述了具有改善的功率效率的D类放大器电路（300）的方法和装置。电路具有至少具有第一和第二开关的输出级（102）和接收待放大的输入信号SIN和第一时钟信号fSW的调制器（104）。调制器基于输入信号在开关周期内控制第一和第二开关的占空比，其中开关周期具有基于第一时钟信号的开关频率。频率控制器（301）响应于输入信号的幅度的指示来控制第一时钟信号的频率，以便在第一输入信号幅度和第二输入信号的第二开关频率第二，较低的输入信号幅度。在低信号幅度下可以容忍较低的开关频率，并且以这种方式改变开关频率，从而在降低开关功率损耗的同时保持稳定性。

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