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An efficient active ripple filter for use in DC-DC conversion

机译:用于DC-DC转换的高效有源纹波滤波器

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When low ripple is required from a switched mode dc-dc converter, dissipative active filters offer an alternative to passive LC and coupled inductor filters. Analytical and experimental results are presented for a simple active ripple filter. The filter employs a pair of current transformers as sensors for feedforward and feedback control and two metal-oxide-semiconductor field-effect transistors (MOSFETs) as cancellation current drivers. Measurements demonstrate good ripple attenuation up to 5 MHz, more than 70 dB being obtained at 100 kHz, the switching frequency of a test converter. The overall efficiency was measured as 95%, with room for further improvement. The filter is suitable for input and output smoothing in dc-dc converters for aerospace and other critical applications.
机译:当开关模式DC-DC转换器需要低纹波时,耗散有源滤波器可替代无源LC和耦合电感器滤波器。给出了一个简单的有源纹波滤波器的分析和实验结果。该滤波器采用一对电流互感器作为前馈和反馈控制的传感器,并使用两个金属氧化物半导体场效应晶体管(MOSFET)作为抵消电流驱动器。测量表明,纹波衰减高达5 MHz,在100 kHz(测试转换器的开关频率)下可获得超过70 dB的衰减。总体效率为95%,还有进一步改进的空间。该滤波器适用于航空航天和其他关键应用的DC-DC转换器中的输入和输出平滑。

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