Title :
Isolated current doubler with multiple levels of ripple cancellation
Author_Institution :
Slater & Matsil L.L.P., Dallas, TX
Abstract :
A new ripple-cancellation structure for a switch-mode power converter using a current doubler is described. Three refinements of an isolated current-doubler rectifier topology produce a very low level of output ripple without compromising power conversion efficiency. One refinement selects the turns ratio of the current doubler magnetics as a function of the nominal switching duty cycle to eliminate output current discontinuities. A second selects the magnetizing inductances to produce matched magnetizing current slopes, which produces a ldquoflatrdquo output current pulse. A third utilizes ldquocancellationrdquo of residual output ripple current by injecting a mirror image of the residual ripple current into the output capacitor based on a voltage difference between windings of the magnetics. With these multiple levels of ripple cancellation, a very low level of output ripple is produced without compromising power conversion efficiency.
Keywords :
network topology; power convertors; rectifiers; isolated current doubler rectifier topology; multiple levels; ripple cancellation; switch mode power converter; Capacitors; Inductors; Jacobian matrices; Magnetic devices; Magnetic switching; Power conversion; Rectifiers; Switching converters; Topology; Voltage;
Conference_Titel :
Telecommunications Energy Conference, 2008. INTELEC 2008. IEEE 30th International
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2055-1
Electronic_ISBN :
978-1-4244-2056-8
DOI :
10.1109/INTLEC.2008.4664107