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:
Aug. 21, 2018
Filed:
Jan. 12, 2017
Treehouse Design, Inc., Colorado Springs, CO (US);
Curtis J. Dicke, Colorado Springs, CO (US);
Treehouse Design, Inc., Colorado Springs, CO (US);
Abstract
A high-voltage filter for an alternating-current (AC) to direct current (DC) power adapter of the type having a rectifier providing an internal ground and a high voltage DC, the high voltage DC coupled to drive a DC-DC converter providing a power adapter output, the high voltage filter coupled to filter the high voltage DC, has a first capacitor coupled between the high-voltage DC and an intermediate node. A second capacitor is coupled between the intermediate node and the internal ground. A source follower transistor has a drain coupled to the high-voltage and a source coupled to the intermediate node, with gate coupled to a reference supply. In a particular embodiment, the reference supply has a resistor coupled between the high voltage DC and the gate of the source follower, and at least one zener diode coupled between the gate of the source follower and internal ground.