US Patent 7863879 AC signal producer and method thereof

Patent 7863879 was granted and assigned to Holtek Semiconductor Inc. on January, 2011 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Holtek Semiconductor Inc.

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7863879

Patent Inventor Names

Yi-Chen Lin0

Date of Patent

January 4, 2011

Patent Application Number

12007604

Date Filed

January 14, 2008

Patent Primary Examiner

‌

Gary L Laxton

Patent abstract

An AC signal producer comprises a controlling unit, a Class-D switch circuit, and a low-pass filter. The control unit receives a DC signal and produces a PWM control signal via checking reference tables. The Class-D switch circuit receives the PWM control signal and outputs a square-wave signal. The low-pass filter converts the square-wave signal into the AC signal. Thereby, disadvantages associated with the utilization of an oscillator and a transformer to convert the DC signal to an AC signal could be solved.