Title :
An efficient active ripple filter for use in DC-DC conversion
Author :
Hamill, David C.
Author_Institution :
Dept. of Electron. & Electr. Eng., Surrey Univ., Guildford, UK
fDate :
7/1/1996 12:00:00 AM
Abstract :
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.
Keywords :
DC-DC power convertors; MOSFET circuits; active filters; circuit feedback; current transformers; driver circuits; feedforward; network topology; smoothing circuits; space vehicle electronics; 100 kHz; 5 MHz; 70 dB; 95 percent; DC-DC conversion; MOSFET; aerospace; cancellation current drivers; current transformers; dissipative active filters; efficiency; efficient active ripple filter; feedback control; feedforward control; input smoothing; metal-oxide-semiconductor field-effect transistors; output smoothing; ripple attenuation; switching frequency; Active filters; Active inductors; Current transformers; DC-DC power converters; Driver circuits; FETs; Feedback control; MOSFETs; Passive filters; Switching converters;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
