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A Capacitor-Cross-Connected Boost Converter With Duty Cycle < 0.5 Control for Extended Conversion-Ratio and Soft Start-Up.
- Source :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers; Oct2022, Vol. 69 Issue 10, p4272-4283, 12p
- Publication Year :
- 2022
-
Abstract
- The series-capacitor boost converter (SCBC) requires a duty cycle ($D) \ge0.5$ control, otherwise has issues of power switch overstress and inductor currents imbalance. Then, we cannot use the SCBC in wide conversion ratio (CR) applications that require CR < 4. Meanwhile, the $D \ge0.5$ control does not allow $D$ to increase smoothly from 0 during start-up, causing severe inrush inductor currents. As a solution, we propose two control schemes on the capacitor-cross-connected (CCC) boost converter, which is the symmetric version of the SCBC. With the proposed hard-charging control, the CCC converter allows $D < 0.5$ without overstress or imbalance issues, thus extending the CR range and facilitating a soft start-up. In addition, we propose a soft-charging control that enhances the efficiency for 3< CR < 4. We study the output impedance and CR expressions under these two types of controls. Finally, we propose a compact centrosymmetric floorplan that reduces the switching nodes’ ringing, verifying the proposed schemes with a 2.8-to-8.4-V input / 24-V output prototype converter. It exhibits a soft start-up with the proposed control. Under an 8-V input voltage and 1.5-A output current, the peak efficiency of the proposed hard-charging and soft-charging control is 94.7% and 96.3%, respectively. [ABSTRACT FROM AUTHOR]
- Subjects :
- DC-to-DC converters
MAXIMUM power point trackers
VOLTAGE control
Subjects
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 69
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 160688634
- Full Text :
- https://doi.org/10.1109/TCSI.2022.3189161