| Abstract |
The resonant converters are not transparent. With the introduction of LCIC or CT-LCIC, the
SRCs will be too complicated to be analytically solved. When operating above the resonant
frequency, the SRCs behave similar to their PWM counterparts. The resonant capacitor can be
considered as “negative inductance” that can be combined the leakage inductance of the resonant
tank; thus, SRC (fs>1) is simplified as PWM converter.
When it is driven by fixed frequency phase-shifted command scheme, the SRC (fs>1) may
operate under DCM mode, where two resonant frequencies affect the converter’s behavior. The
concept of “Switching frequency shift” can equivalent such two resonant frequencies effect with
higher switching frequency under one resonant frequency.
By deploying those two concepts, the steady-state characteristics of SRCs (fs>1) can be well
approximated. The results are experimentally verified. |
