使用陶瓷电容做补偿的直流变换器

DC Converters Using Ceramic Capacitors as Compensating

越来越多的直流电压转换器使用陶瓷电容器作为输出滤波的主要部分。直流电压转换器的瞬态特性是由反馈回路的增益和带宽决定的,而陶瓷电容对其有改善作用。陶瓷电容产生更高的谐振频率以及相位滞后,改善直流电压转换器的稳定运行。电源设计者需在最坏的情况下对不同条件的器件和参数容差进行分析考量。论文对比介绍了使用不同类型输出电容的影响,性能对比和优缺点。

More and more DC converters use ceramic capacitors as the main part of output filtering. The transient characteristics of DC voltage converters are determined by the gain and bandwidth of the feedback loop, and the ceramic capacitors can improve their performance. Ceramic capacitors cause higher resonant frequency of the output filter and phase lag, which is affecting stable operation of a DC converter. In the worst case,the power designer needs to analyze the device and parameter tolerance of different conditions. In this paper, we introduce the effects of different types of output capacitors, performance comparison, advantages and disadvantages.