摘要
在晶体管是理想的情况下推算G类功放的效率曲线,再根据实际情况估算G类功放的大致平均效率,得出G类功放的电源效率随电源组数增加而增大的具体数值关系。利用A/D转换技术原理提出一种数字切换G类功放电源的全新方法,使较少的电源数组合出较多的电源组数,这种方法比常规幅值直接切换电源的G类功放具有更高的效率。对G类功放特有的切换干扰、损耗和速度等细节问题指出了解决方案。
In the case that transistors are ideal, efficiency cure of G-type amplifier is calculated, then its approximate average efficiency according to practical situations is evaluated, and the detailed value relationship between power supply efficiency and group number of power supply in G-type amplifier is figured out. Technical principles of A/D converter is used to raise a brand-new method to switch the power supply of G-type amplifier by digital method. This method can create more power supply groups with less power supplies and show higher efficiency than the G-type amplifiers using routine method to directly switch power supplies. Solutions to the detailed problems of G-type amplifier is proposed such as switching disturbance, loss and speed which are particular to G-type amplifier.
出处
《电声技术》
2009年第8期37-41,59,共6页
Audio Engineering
关键词
G类功放效率
效率曲线
平均效率
数字切换
切换干扰
G--type power amplifier
efficiency curve
average efficiency
digital switch
switching disturbance
