| US 7,595,669 B2 | ||
| Method and apparatus for producing clean, undistorted variable voltage 50-60 Hz sine wave | ||
| Ricky Curl, Pinson, Ala. (US); and Frederick Howell von Herrmann, Homewood, Ala. (US) | ||
| Assigned to The Von Corporation, Birmingham, Ala. (US) | ||
| Filed on Jul. 26, 2007, as Appl. No. 11/828,681. | ||
| Prior Publication US 2009/0027092 A1, Jan. 29, 2009 | ||
| Int. Cl. H03B 28/00 (2006.01) | ||
| U.S. Cl. 327—129 | 14 Claims |
| 1. An apparatus use in an AC circuit for producing a clean, undistorted variable voltage sine wave comprising:
A first AC solid state switch driven at a switching frequency substantially greater than a low frequency input voltage;
A second AC solid state switch driven at said switching frequency;
A microprocessor, generating said switching frequency, operatively coupled to said AC switches such that said first AC switch
can be iteratively turned on for a variable period and such that second AC solid state switch is turned on at a selected time
after said first AC switch has been turned off and turned off a selected time before said first AC switch is turned on; and,
A transformer having a primary operatively coupled to said first switch and said second switch such that the voltage at a
secondary of said transformer varies with the period of time said first AC switch is turned on.
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