TY - GEN
T1 - Switching Frequency is Not the Limit
T2 - 24th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2023
AU - Zhou, Daniel H.
AU - Chen, Minjie
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - Switching frequency is usually considered the main limiting factor for reducing the passive component size and improving the control bandwidth of power converters. The switching frequencies of semiconductor devices and passive components are usually the same in typical power electronics systems. Multi-level, multi-phase, and magnetically coupled circuits utilize a large number of low-frequency semiconductor devices to drive a few high-frequency passive components, enabling reduced ripple, reduced dc energy storage, miniaturized volume, and improved transient performance. This paper presents a 1 MHz four-phase, five-level coupled inductor flying capacitor multilevel (FCML) converter that tracks signals at and above the switching frequency. Combining multiple voltage levels, multiple phases, and coupled inductors, the effective switching frequency and achievable control bandwidth are multiplied by 16× to 16 MHz. A printed circuit board (PCB) embedded planar coupled inductor is designed to intrinsically balance the flying capacitor voltages, minimize output distortion, minimize output voltage/current ripple, and improve the transient performance. Spread spectrum pulse-width modulation (PWM) is implemented to mitigate high frequency harmonics.
AB - Switching frequency is usually considered the main limiting factor for reducing the passive component size and improving the control bandwidth of power converters. The switching frequencies of semiconductor devices and passive components are usually the same in typical power electronics systems. Multi-level, multi-phase, and magnetically coupled circuits utilize a large number of low-frequency semiconductor devices to drive a few high-frequency passive components, enabling reduced ripple, reduced dc energy storage, miniaturized volume, and improved transient performance. This paper presents a 1 MHz four-phase, five-level coupled inductor flying capacitor multilevel (FCML) converter that tracks signals at and above the switching frequency. Combining multiple voltage levels, multiple phases, and coupled inductors, the effective switching frequency and achievable control bandwidth are multiplied by 16× to 16 MHz. A printed circuit board (PCB) embedded planar coupled inductor is designed to intrinsically balance the flying capacitor voltages, minimize output distortion, minimize output voltage/current ripple, and improve the transient performance. Spread spectrum pulse-width modulation (PWM) is implemented to mitigate high frequency harmonics.
KW - control bandwidth
KW - coupled inductors
KW - flying capacitor multilevel converter
KW - multiphase converters
KW - transient response
KW - voltage balancing
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U2 - 10.1109/COMPEL52896.2023.10221114
DO - 10.1109/COMPEL52896.2023.10221114
M3 - Conference contribution
AN - SCOPUS:85171485470
T3 - 2023 IEEE 24th Workshop on Control and Modeling for Power Electronics, COMPEL 2023
BT - 2023 IEEE 24th Workshop on Control and Modeling for Power Electronics, COMPEL 2023
PB - Institute of Electrical and Electronics Engineers Inc.
Y2 - 25 June 2023 through 28 June 2023
ER -