Title :
Analysis and design of an active ripple filter for DC-DC applications
Author :
Hamill, David C. ; Toh, Ong
Author_Institution :
Dept. of Electron. & Electr. Eng., Surrey Univ., Guildford, UK
Abstract :
When low ripple is required from a DC-DC converter, active filters offer an alternative to passive LC and coupled inductor filters. A simple experimental active ripple filter is presented, which employs a pair of current transformers as sensors for feedforward and feedback control and two MOSFETs as cancellation current drivers. Measurements demonstrate good ripple attenuation: more than 70 dB at 100 kHz, and 23 dB at 1 MHz. The overall efficiency was measured as 95%, but could be improved by attention to the auxiliary supplies to around 98%. The filter is suitable for input and output smoothing in aerospace and other critical applications
Keywords :
DC-DC power convertors; MOSFET; active filters; current transformers; driver circuits; electric current control; electric sensing devices; feedback; feedforward; 1 MHz; 100 kHz; 95 to 98 percent; DC-DC converter; MOSFET; active ripple filter; aerospace applications; cancellation current drivers; current transformers; feedback control; feedforward control; input smoothing; low ripple; output smoothing; ripple attenuation; sensors; Active filters; Attenuation measurement; Circuit topology; Couplings; DC-DC power converters; Filtering; Inductors; Passive filters; Switching converters; Voltage;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 1995. APEC '95. Conference Proceedings 1995., Tenth Annual
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2482-X
DOI :
10.1109/APEC.1995.468961
