Patent ID: 8450883
Filing Date: 2013-05-28
Classification: G05F,Y02E

Abstract:
1. A maximum power point tracking control apparatus for tracking a maximum output power point of a solar battery when supplying electric power, generated by the solar battery, to a load after performing switching control on the electric power by means of a solar-battery output controlling switching element, the maximum power point tracking control apparatus comprising: a voltage detection section for detecting an output voltage of the solar battery; a current detection section for detecting an output current of the solar battery; a storage section storing therein duty cycle values of the solar-battery output controlling switching element that are predefined on the basis of relationship between output voltages and output currents of the solar battery; and a control section for, at a start of maximum power point tracking control, reading out, from the storage section, one of the duty cycle values that corresponds to the output voltage detected by the voltage detection section and controlling a duty cycle of the solar-battery output controlling switching element in accordance with the read-out duty cycle value; wherein, at the start of the maximum power point tracking control, the control section calculates a voltage difference between the output voltage of the solar battery detected by the voltage detection section and an output voltage of the solar battery last detected by the voltage detection section, and, when a voltage-threshold difference between an absolute value of the voltage difference and a predefined voltage threshold value is a positive value, the control section reads out the corresponding duty cycle value from the storage section to control the duty cycle of the solar-battery output controlling switching element in accordance with the read-out duty cycle value.