Gw. Moon et al., SWITCHED SLIDING-MODE CONTROL FOR ZCS SERIES-RESONANT AC DC CONVERTER/, IEE proceedings. Electric power applications, 142(5), 1995, pp. 297-307
A combined buck and boost zero-current-switched series-resonant AC/DC
converter for DC output voltage regulation with a high power factor is
proposed. The proposed single-phase AC/DC converter enables a zero-cu
rrent switching operation of all the power devices, allowing the circu
it to operate at high switching frequencies and high power levels. A d
ynamic model for this AC/DC converter is developed in a discrete-time
domain and an analysis for the internal operational characteristics is
explored. Based on this analysis, a switched sliding-mode control tec
hnique is investigated with its advantages over the other type of curr
ent-control technique are discussed. With the proposed control techniq
ues, unity power factor without current overshoot and a wide output vo
ltage range can be obtained.