Method for improving the start up of an ultrasonic system under zero load conditions
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United States of America Patent
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-
Nov 12, 2002
Grant Date -
Apr 25, 2002
app pub date -
May 25, 2001
filing date -
Oct 20, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The start up performance of an ultrasonic system under zero load conditions is improved by setting a phase set point in a frequency control loop such that, at start up under zero load conditions, the phase set point intersects a point on a phase-frequency response curve which has a low positive slope. This intersection point on the phase-frequency response curve changes as the load is increased and the system Q is decreased. The controller 'seeks' a target 0.degree. impedance phase angle. The frequency of the ultrasonic generator is set to an off-resonance frequency which is lower than the resonance of any known hand piece/blade combination. In order for the drive voltage to not exceed the physical limit of the system, the drive current is set to a low level. The drive frequency is then smoothly increased in steps until the target 0.degree. impedance phase delta is located.
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