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:
Oct. 12, 2021
Filed:
Oct. 31, 2018
Applicant:
Hatch Ltd., Mississauga, CA;
Inventors:
Assignee:
Hatch Ltd., Mississauga, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 7/148 (2006.01); H02J 3/18 (2006.01); H03K 17/72 (2006.01); H05B 7/18 (2006.01); H02J 3/00 (2006.01);
U.S. Cl.
CPC ...
H02J 3/18 (2013.01); H02J 3/1807 (2013.01); H02J 3/1892 (2013.01); H03K 17/72 (2013.01); H05B 7/18 (2013.01); H02J 3/002 (2020.01);
Abstract
A configuration of switches added to a line control circuit allows for switching back and forth between a configuration featuring a series-connected thyristor switch and reactor and a configuration featuring a parallel-connected thyristor switch and reactor. Connecting the reactor in series with the thyristor switch allows a controlled high-impedance circuit configuration that is particularly well adapted for cold furnace start-ups and furnace idling. In this manner, there is reduced need for such equipment as extra startup transformers, alternate low-voltage power supply configurations and temporary specialty electrical apparatus for cold furnace start-ups.