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:
Jun. 22, 2010
Filed:
Nov. 10, 2004
Ari Kattainen, Hyvinkää, FI;
Timo Syrman, Hyvinkää, FI;
Ari Kattainen, Hyvinkää, FI;
Timo Syrman, Hyvinkää, FI;
Kone Corporation, Helsinki, FI;
Abstract
A control circuit for controlling an electromechanical elevator brake is disclosed. The control circuit includes at least one brake coil (L), a direct-voltage source (BR), a semiconductor switch arrangement, a current measuring unit, at least two semiconductor switches, and a control unit (CO) for controlling operation of the circuit. The current measuring unit (Lm) produces current data that is passed to the control unit (CO). The at least two semiconductor switches (SW, SW) are controlled by the control unit (CO) such that operation is alternated between the two so that the working condition of each switch can be checked in its turn on the basis of feedback data obtained from the current measuring unit.