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:
Nov. 23, 2010
Filed:
Mar. 17, 2005
Kazuhiko Takasaki, Tokyo, JP;
Yukitaka Monden, Tokyo, JP;
Kazuhiko Takasaki, Tokyo, JP;
Yukitaka Monden, Tokyo, JP;
Toshiba Elevator Kabushiki Kaisha, Tokyo, JP;
Abstract
In addition to the construction of a typical elevator control device in which power generated during regenerative operation is dissipated by a resistance chopper (), an elevator control device is newly provided with: an electric double layer capacitor () connected in parallel with the DC capacitor () that smoothes the DC ripple of the rectifier circuit () that rectifies the AC power of the AC power source () and having an electrostatic capacitance that is considerably larger than this DC capacitor; a voltage detection circuit () that detects the terminal voltage of this electric double layer capacitor; and a drive control unit () that uses a voltage in the vicinity of the rated voltage of the electric double layer capacitor as the operating voltage of resistance chopper and, when the terminal voltage detected by a voltage detection circuit reaches the voltage in the vicinity of the rated voltage of the electric double layer capacitor, operates and controls the resistance chopper.