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. 25, 2025
Filed:
Dec. 20, 2022
Kabushiki Kaisha Toshiba, Tokyo, JP;
Yuusuke Kouno, Tokyo, JP;
Toshiyuki Baba, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An auxiliary power supply device according to an embodiment includes a high-frequency transformer; a chopper to convert a DC power; an inverter to convert output power of the chopper into AC power and supply the AC power to the high-frequency transformer; a DC capacitor connected to a DC end of the inverter; a resonant capacitor to generate a resonance according to switching of the inverter; a rectifier to convert, into DC power, the AC power supplied from the inverter via the high-frequency transformer; and a controller to calculate a resonant frequency of a resonant circuit including the resonant capacitor based on a value supplied from a detector and detect a decrease in capacity of the resonant capacitor using the resonant frequency and the value of the DC input current.