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:
Mar. 20, 2012
Filed:
May. 02, 2007
Martin Ochsenbein, Russikon, CH;
Curdin Stäheli, Wetzikon, CH;
Roman Furrer, Fehraltorf, CH;
Belimo Holding AG, Hinwil, CH;
Abstract
A safety drive unit () with a safety circuit () that resets a flap or a valve into a specified safety position for controlling a gas or liquid volumetric flow, in particular in the field of heating, ventilation, and monitoring systems. The safety drive unit () comprises an actuator () with a controllable electric motor (28), a capacitive energy storage unit (), and energy converter () with a power module, and a power supply (). During normal operation, the electric current in the power module of the energy converter () is converted to a lower voltage and stored in the capacitive energy storage unit. If the voltage drops below a predetermined value or if there is a power failure, the stored electrical charge is converted back to a higher voltage by the same power module, and the electric motor () is activated until the specified safety position is reached.