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. 12, 2019
Filed:
Sep. 07, 2016
Kyosan Electric Mfg. Co., Ltd., Yokohama-shi, Kanagawa, JP;
Itsuo Yuzurihara, Yokohama, JP;
Ryosuke Ohma, Yokohama, JP;
KYOSAN ELECTRIC MFG. CO., LTD., Yokohama-shi, JP;
Abstract
In frequency control where impedance matching is performed by frequency sweep in an RF power supply device, a frequency sweep direction is specified, allowing a reflection coefficient and/or reflected power to move to a minimum, whereby it is possible to reduce a time length required until detecting the frequency that enables the reflection coefficient and/or the reflected power to be minimized. The frequency control for impedance matching in the RF power supply device is performed according to the following two-stage control; A) phase control that specifies the frequency sweep direction that allows the reflection coefficient and/or the reflected power to move to a minimum, based on the phase state of oscillating frequency, and that starts increasing or decreasing the frequency in thus specified sweep direction; and B) reflected power control where the reflection coefficient or the reflection amount is used as a control end condition for completing the frequency control.