| 摘要 |
PURPOSE:To find the state of the maximum electric power of a solar battery accurately irrelevantly to load variation without using a solar battery for a sensor by finding the voltage which provides the maximum electric power from the temperature and illuminance of the solar battery. CONSTITUTION:Characteristics of the relation between the open voltage and maximum electric power point voltage of the solar battery 1 and the relation of a short-circuit current and the maximum electric power point voltage are previously stored in an electric power arithmetic comparator 9. When the maximum electric power point voltage is found in an inverted state, an open switch 8 is momentarily opened to enters an unloaded state, or a short-circuit state generated with a short-circuit switch 7; and the open voltage and short-circuit current at this time are detected by a voltage detector 5 and a current detector 6 and inputted to the electric power arithmetic comparator 9. The voltage arithmetic comparator 9 finds an approximate value of the maximum electric power point voltage from the relation with temperature or illuminance and inputs it to an electric power setter 11 to control an electric power controller 3 so that the solar battery outputs the maximum electric power. |
