Zero-voltage-switching quasi-resonant converters with multi- resonant bipolar switch

摘要

A compact, high frequency, zero voltage switching quasi- resonant converter with a multi-resonant, bi-polar switch includes a resonant switch (S), a first diode (D.sub.p) in parallel with the switch (S), a second diode (D.sub.s)in series with the switch (S), first (C.sub. r1) and second (C.sub.r2) resonant capacitors and a resonant inductor (L. sub.r). The first resonant capacitor (C.sub.r1) is operatively connected to the resonant switch (S) such that any voltage change across the first resonant capacitor (C.sub.r1) necessitates a corresponding voltage change across the resonant switch (S). The second resonant capacitor (C.sub.r2) is operatively connected to the second diode (D.sub.s) such that any voltage change across the second resonant capacitor (C.sub.r2) necessitates a corresponding voltage change across the second diode (D. sub.p). The resonant inductor (L.sub.r) is operatively connected in series with the resonant switch (S) such that any current change through the resonant inductor (L.sub.r) necessitates corresponding changes in the sum of currents flowing through the first resonant capacitor (C.sub.r1), first diode (D.sub.p), and the resonant switch (S), and the sum of currents flowing through the second resonant capacitor (C.sub.r2) and the second diode (D.sub.s).