| Abstract |
An inductive charging system is a DC-DC converter that is electrically separated by a Loosely Coupled
Inductive Coupler (briefly, LCIC). A LCIC possesses asymmetrical leakage inductance on both the
primary and the secondary side, which cannot be ignored comparing to magnetizing inductance. Basically,
LCIC have two structures: single secondary coil (LCIC) and center-tapped secondary coil (CT-LCIC).
When it is driven by fixed frequency phase-shifted command scheme, the LCIC-based converter behaves
as a soft-switching PWM converter. According to LCIC structure and its corresponding ouput rectifier
topology, the above-mentioned converters can further be classified as ZVS-PWM-FB and ZVS-PWM-CT
converters. Both of them take use of the parasitic capacitors of the switches and the leakage inductances of
LCIC to realize soft-switching.
Apart from large asmmetrical, leakage inductances exist in its primary and seconday side of LCIC, for
CT-LCIC, those two secondary leakage inductances will couple themselves and exhibits “lekage
inductance coupling effect”.
Such large aymmetrical leakage inductances on LCIC and the leakage inductance coupling on CT-LCIC
have strong influence on the behaviors of a PWM converters, and thus, should be investigated. |
