Patent ID: 8174281
Filing Date: 2012-05-08
Classification: H02S,Y02B,Y02E

Abstract:
1. A method for tracking maximum power of a photo-voltaic array, which is suitable for tracking a power of the photo-voltaic array supplied to a load, comprising following steps: detecting an output voltage of said photo-voltaic array before performing an operation of load increase/decrease; performing said operation according to a preset current difference; detecting said output voltage after performing said operation; wherein when said operation is for load increase with said output voltage detected after performing said operation being less than said output voltage before performing said operation with a value not less than a preset voltage difference during a preset time, a next operation is set for load increase; when said operation is for load increase with said output voltage detected after performing said operation being not less than said output voltage before performing said operation during said preset time, or said output voltage detected after performing said operation being less than said output voltage before performing said operation but still not reaching said preset voltage difference after said preset time, said next operation is set for load decrease; when said operation is for load decrease with said output voltage detected after performing said operation being greater than said output voltage before performing said operation with a value not less than said preset voltage difference during said preset time, said next operation is set for load decrease; and when said operation is for load decrease with said output voltage detected after performing said operation being not greater than said output voltage before performing said operation during said preset time, or said output voltage detected after performing said operation being greater than said output voltage before performing said operation but still not reaching said preset voltage difference after said preset time, said next operation is set for load increase.