The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 08, 2003
Filed:
Aug. 19, 1997
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An electric power conversion unit for driving a pump run by electric power generated by a solar panel , a storage battery connected to the solar panel via the switch , and a controller for controlling the electric power conversion unit and the switch are provided. The controller closes the switch during any period when the amount of insolation is large and performs the maximum power point tracking control of the solar panel , and otherwise, controls the electric power conversion unit to drive at one of plural fixed frequencies in dependence upon an output voltage from the solar panel by closing the switch . Accordingly, it is possible to utilize output from an unstable electric power supply efficiently, such as a solar cell, thereby providing a reliable electric motor driving apparatus having a simple configuration and a control method therefor.