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. 19, 2019
Filed:
Nov. 20, 2017
Ademco Inc., Golden Valley, MN (US);
David Mulhouse, Minnetonka, MN (US);
Mohammad Aljabari, Booklyn Park, MN (US);
Tracy Lentz, Minneapolis, MN (US);
Petr Adamik, Jihlava, CZ;
Tarik Khoury, Brno, CZ;
Steven J. McPherson, Richfield, MN (US);
Arnold Kalla, Maple Grove, MN (US);
Eugene J. Takach, Maple Grove, MN (US);
Ademco Inc., Golden Valley, MN (US);
Abstract
A surge protection circuit for an electronic device such as an HVAC controller. In one example, the surge protection circuit may include a first voltage clamp, a second voltage clamp, a resistor, and an output port. The first voltage clamp may provide a first clamping voltage between a power input terminal and a common terminal. The second voltage clamp may provide a second clamping voltage that is less than the first clamping voltage. The resistor may be connected in series with the second voltage clamp, and the series connected resistor and second voltage clamp may be connected in parallel with the first voltage clamp. As such, a surge current at the power input terminal may be split between the first voltage clamp and the second voltage clamp. The amount of surge current that is provided to the second voltage clamp may be set by the value of the resistor.