Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2008-08-14
2010-12-28
Berhane, Adolf (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S906000
Reexamination Certificate
active
07859241
ABSTRACT:
A photovoltaic power generation controller, in which minute power change is detected even with a low-resolution AD converter, thereby being capable of performing maximum power point tracking control with high accuracy, is provided. In the photovoltaic power generation controller of the invention, a control circuit44shifts switches41to respective output A sides of a voltage detector8and a current detector9; gives a low-frequency ripple component to an operating voltage of a solar cell1while increasing modulation factor D by predetermined variation width d, to start maximum power point search from an open circuit voltage side; confirms a maximum power point passage when: an operating point oscillates in the vicinity of the maximum power point; and a power value, which is output by a power detector43, after update of the modulation factor becomes smaller than a power value before update of the modulation factor; and switches the switches41to respective output sides of amplifiers23and24to continue the maximum power point tracking control.
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Ohniwa Katsumi
Ohtsubo Michio
Yoshida Toshiya
Berhane Adolf
Foley & Lardner LLP
Tokyo Denki University
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