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:
Sep. 10, 2019
Filed:
Nov. 30, 2018
Nxp B.v., Eindhoven, NL;
Joan Wichard Strijker, Wijchen, NL;
NXP B.V., Eindhoven, NL;
Abstract
A switch mode power supply can include a bipolar device (e.g., bipolar junction transistor) connected in series with a capacitor and operable as a bipolar clamp switch where the bipolar device can be turned on by forward biasing a collector-base junction. The capacitor connected in association with the bipolar device can keep the bipolar clamp switch conductive for a limited time based on energy obtained from a transformer primary winding and stored in the capacitor when the base-collector junction bias is reversed. Storage charge properties of the bipolar clamp switch can be used to keep it conductive and working as an active clamp without requiring a high driver circuit.