A Three-Level Boost Converter With Full-Range Auto-Capacitor-Compensation Pulse Frequency Modulation

A three-level boost converter enables efficient voltage step-up power conversion with high power density by reducing the inductance and blocking voltage requirements in a conventional boost converter. An auto-capacitor-compensation pulse frequency modulation (ACC-PFM) controller, combining peak and...

Full description

Saved in:
Bibliographic Details
Published in:IEEE journal of solid-state circuits 2020-03, Vol.55 (3), p.744-755
Main Authors: Liu, Wen Chuen, Ng, Pei Han, Pilawa-Podgurski, Robert
Format: Article
Language:English
Subjects:
Capacitor balancing
Capacitors
CMOS
Compensation
control
Conversion ratio
Converters
current-mode
Electric potential
Energy conversion efficiency
Frequency modulation
hybrid switched capacitor (SC)
Inductance
Inductors
level shifter (LS)
Power conversion
Pulse frequency modulation
pulse frequency modulation (PFM)
Switches
Voltage
Voltage control
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A three-level boost converter enables efficient voltage step-up power conversion with high power density by reducing the inductance and blocking voltage requirements in a conventional boost converter. An auto-capacitor-compensation pulse frequency modulation (ACC-PFM) controller, combining peak and valley current-mode controls, is proposed to resolve the issue of unbalanced flying capacitor voltage, as well as to regulate the output voltage. The capacitor balance is further strengthened through a delay-equalized level shifter that generates duty ratios with only sub-nanosecond deviations. The step-up power conversion from the input voltage of 0.3-3.0 V to the output voltage of 2.4-5.0 V is demonstrated through a prototype converter implemented in a 65-nm CMOS process with 0.28 mm 2 active area. This converter achieves 96.8% peak efficiency and an 83-mA peak output current, with an 8\times peak step-up conversion ratio.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2019.2959509