Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2005-02-28
2008-08-05
San Martin, Jaydi A (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S314000, C310S316010, C310S316030, C310S317000, C310S323190
Reexamination Certificate
active
07408290
ABSTRACT:
The present invention is directed to a high-powered (e.g., >500 W) ultrasonic generator for use especially for delivering high-power ultrasonic energy to a varying load including compressible fluids. The generator includes a variable frequency triangular waveform generator coupled with pulse width modulators. The output from the pulse width modulator is coupled with the gates of an Isolated Gate Bipolar Transistor (IGBT), which amplifies the signal and delivers it to a coil that is used to drive a magnetostrictive transducer. In one embodiment, high voltage of 0-600 VDC is delivered across the collector and emitter of the IGBT after the signal is delivered. The output of the IGBT is a square waveform with a voltage of +/−600V. This voltage is sent to a coil wound around the ultrasonic transducer. The voltage creates a magnetic field on the transducer and the magnetorestrictive properties of the transducer cause the transducer to vibrate as a result of the magnetic field. The use of the IGBT as the amplifying device obviates the need for a Silicon Controlled Rectifier (SCR) circuit, which is typically used in low powered ultrasonic transducers, and which would get overheated and fail in such a high-powered and load-varying application.
REFERENCES:
patent: 6897628 (2005-05-01), Gunnerman et al.
patent: 7211928 (2007-05-01), Puskas
patent: 2004/0227414 (2004-11-01), Gunnerman et al.
patent: 2005/0017599 (2005-01-01), Puskas
patent: 2006/0101919 (2006-05-01), Gunnerman et al.
patent: 2006/0196915 (2006-09-01), Gunnerman
patent: 2006/0238068 (2006-10-01), May et al.
patent: 2006/0260405 (2006-11-01), Gunnerman et al.
Gunnerman Rudolf W.
May Jason
Richman Charles I.
Martin Jaydi A San
SulphCo, Inc.
Townsend and Townsend / and Crew LLP
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