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. 04, 2025
Filed:
Jun. 17, 2022
Toshiba Mitsubishi-electric Industrial Systems Corporation, Tokyo, JP;
TMEIC CORPORATION, Tokyo, JP;
Abstract
A phase synchronization control circuit includes: a phase difference detector that detects a phase difference between AC voltage and an AC signal, a frequency control circuitry that generates a first frequency control value to eliminate the phase difference, a frequency limiter that limits the first frequency control value to fall within a variable limit range to generate a second frequency control value, a limiter control circuitry that sets the variable limit range based on the phase difference and reduces the variable limit range in width in response to the phase difference decreasing, and an oscillator that generates the AC signal with a frequency of a value corresponding to the second frequency control value. This can suppress overshooting of the AC signal in frequency to be small.