| 摘要 |
PROBLEM TO BE SOLVED: To provide a step-up maximum power point tracking device and control method that efficiently implement inexpensive and responsive MPPT control of photovoltaic power generation. SOLUTION: The device and control method control output power at a maximum point without current detection by detecting and comparing the pulse width of a counter electromotive force pulse on a switched coil as an output power parameter for MPPT control. The step-up maximum power point tracking device can implement more precise control by detecting and correcting an anomaly in the control according to the state of the induced pulse during the operation and making the PWM frequency variable to use input electric energy as a power parameter having high resolution in a wide range from small power to large power. The high speed PWM logic control method and step-up maximum power point tracking device can trigger a switching signal when the secondary voltage of the coil rises to a set threshold voltage providing the maximum power point. COPYRIGHT: (C)2009,JPO&INPIT
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