An analog maximum power point tracking (MPPT) controller integrated circuit (IC) based on open-circuit voltage method was proposed to enhance the photovoltaic conversion efficiency of solar cell. Utilizing the near-linear dependence between the open-circuit voltage of solar cell and its maximum power point (MPP) voltage, the IC samples the open-circuit voltage periodically and deduces the corresponding MPP voltage. The IC is featured by simple structure, low cost and good stability. Besides realizing the precise MPPT of solar cell, the chip can sample the open-circuit voltage and renew the current MPP voltage every interval. The real-time monitoring of solar cell output voltage and fast dynamic response to fluctuations of circumstance conditions are also implemented. The chip consists of basic modules like reference, regulator, oscillator and error amplifier as well as the drivers using bootstrap technique, which boosts the output voltage. The circuit was designed, optimized and fabricated by 1.5 μm BCD (Bipolar-CMOS-DMOS) technology with the chip area of about 3.0 mm×2.6 mm. And the test results showed that all expected functions were realized．
ZHANG Dan-Yan, TUN Xiao-Bei, DIAO Meng-Lian, et al. Integrated circuit design for solar cell maximum power point tracking. J4, 2009, 43(11): 2000-2005.
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