Hybrid switched capacitor power converters, such as the series-capacitor buck (SCB) converter, have intrinsic LC resonant dynamics that might influence its control stability and transient response. This letter presents a systematic approach to analyzing this intrinsic resonant behavior, which can be classified into output LCoresonance and interphase LCBresonance based on common-mode and differential-mode decomposition. The impacts of coupled inductors on the resonant amplitude, frequency, and settling time during a step line transient are analyzed. The influence of intrinsic resonance on control stability is clarified, providing guidance for controller design. A two-phase SCB prototype was built and tested with discrete and coupled inductors under different operating conditions. All the analyses are verified by simulation or experimental results.
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering
- Averaged model
- LC resonance
- coupled inductor
- multiphase converter
- series-capacitor buck (SCB)