期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 30, 期 12, 页码 7230-7244出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2015.2395813
关键词
Analog integrated circuits; current-mode control; dc-dc power conversion; energy harvesting; integrated circuit design; photovoltaic power systems; power converter; power electronics
资金
- NXP Semiconductors
- Natural Sciences and Engineering Research Council of Canada
- Canada Foundation for Innovation
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.
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