A Cell-Level Differential Power Processing IC for Concentrating-PV Systems With Bidirectional Hysteretic Current-Mode Control and Closed-Loop Frequency Regulation

作者：Zaman Mohammad Shawkat^*; Wen Yue; Fernandes Ryan; Buter Berry; Doorn Toby; Dijkstra Marcel; Bergveld Henk Jan; Trescases Olivier

来源：IEEE Transactions on Power Electronics, 2015, 30(12): 7230-7244.

DOI：10.1109/TPEL.2015.2395813

• Analog integrated circuits
• current-mode control
• dc-dc power conversion
• energy harvesting
• integrated circuit design
• photovoltaic power systems
• power converter
• power electronics

This paper describes an integrated power management IC with bidirectional current capability, aimed at compensating differences in output current between series-connected cells in concentrating photovoltaic (CPV) systems. The integrated 3.6-MHz power stage allows building a small-form-factor converter per cell. Ahysteretic current-mode controller regulates the bidirectional converter's current to equalize neighboring cell voltages. A phase-locked loop controls the inductor current ripple around the average value to stabilize the switching frequency. The use of hysteretic current-mode control with a novel bidirectional senseFET scheme provides inherent current protection and high reliability. The converter can operate from an input voltage as low as 1.8 V and with an inductor current up to +/- 1.5 A, while achieving a system efficiency above 90% for current mismatches between cells up to 60%. Measurement results show that the converter maximizes the output power of series-connected CPV cells with mismatched output currents.

• 出版日期2015-12