Controller for a high frequency agitation source
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United States of America Patent
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-
Nov 2, 2010
Grant Date -
Jan 29, 2009
app pub date -
Feb 7, 2007
filing date -
Feb 8, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A controller for a high-frequency agitation source includes a signal generator to generate a drive signal having a variable duty cycle. The drive signal is used to drive the high-frequency agitation source. The controller also includes a temperature detector to detect the temperature of the high-frequency agitation source. The controller is configured to vary the duty cycle of the drive signal in response to the temperature of the high-frequency agitation source. By varying the duty cycle of the drive signal, the average power supplied to the piezoelectric crystal can be varied while still maintaining a fixed amplitude of oscillation. This allows the temperature of a high-frequency agitator, for example, a piezoelectric crystal, to be controlled.
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