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. 07, 2025
Filed:
Oct. 23, 2024
Hong Kong Applied Science and Technology Research Institute Company Limited, Hong Kong, HK;
Abstract
A Switched-Mode Power Supply uses a primary winding of a transformer rather than an inductor. The secondary winding of the transformer is driven with a current generated by a negative inductance circuit. When the reverse current flows it can increase the equivalent inductance value of the primary windings. A steady-state detector activates a steady signal and closes a switch to turn on the reverse current from an op amp when the output voltage remains within predetermined limits, causing the inductance to increase thus reducing ripple during steady state. When an output transient occurs, the steady signal is deactivated and the switch opened to stop the current from flowing through the transformer secondary, reducing primary inductance to allow for current to flow faster to the output to suppress the transient. Resistor and capacitor networks around the op amp allow for tuning the inductance modulation.