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:
May. 24, 2011
Filed:
Sep. 11, 2008
Kenneth P. Regan, Beverly, MA (US);
Kenneth P. Regan, Beverly, MA (US);
TEL Epion Inc., Billerica, MA (US);
Abstract
A power supply is provided for an electrostatic chuck. A signal generating circuit of the power supply is configured to generate a square wave signal. An amplifying circuit is electrically connected to the square wave circuit and configured to amplify the square wave signal. A transformer has a primary and a secondary winding. The primary winding is electrically connected to the amplifying circuit and the secondary winding is configured to be electrically connected to the electrostatic chuck. The secondary winding produces a signal for the electrostatic chuck. A voltage divider circuit is electrically connected to the secondary winding and to the amplifying circuit. The voltage divider circuit is configured to reduce the voltage of the signal for the electrostatic chuck and feed back the reduced voltage signal to the amplifying circuit. The signal from the secondary winding is a trapezoidal waveform with approximately flat tops and minimal dead-time between phase reversals.