학술논문
Current Balancing Strategy based on Threshold Midpoint Adjustment for Interleaved Constant Frequency Hysteresis Control Buck Converter
Document Type
Conference
Author
Source
2023 IEEE 15th International Conference on ASIC (ASICON) ASIC (ASICON), 2023 IEEE 15th International Conference on. :1-4 Oct, 2023
Subject
Language
ISSN
2162-755X
Abstract
Existing current balancing strategy based on single current threshold adjustment is not suitable for interleaved constant frequency hysteresis (CFH) buck converter with threshold width adjustment (TWA). To address this issue, this paper proposes a threshold midpoint adjustment (TMA) circuit to achieve current balancing. Firstly, hysteresis comparison in the TWA is linearized to precisely design the TWA loop. Secondly, to ensure the steady-state accuracy and stability of TMA loop, a multi-phase coupled small signal model (MPC-SSM) is proposed with consideration of coupling effect among multiple phases. Finally, based on 180nm BCD process, TMA for current balancing is realized on a four-phase interleaved CFH buck converter. FOM for voltage ripple is four times of single-phase buck converter, which means better ripple suppression. Power level is twice of single-phase buck converter.