Apparatus and method for automatically adjusting power output of

Details Apparatus and method for automatically adjusting power output of Apparatus and method for automatically adjusting power output of

1993-02-22

1994-10-18

Smith, Jerry

Boots, shoes, and leggings

318116, 310316, 364477, 364481, 2281101, 228 11, G05B 1302, H01L 21607

Patent

active

053574230

ABSTRACT:
Apparatus and a method for controlling the power output of an ultrasonic generator to a transducer includes a variable impedance network circuit which is interposed between the generator and the transducer. Sensing circuits and a microprocessor are coupled to the input of the transducer so that the total impedance Z.sub.T, the transducer impedance in free air Z.sub.FA and the load impedance Z.sub.L may be calculated and the network impedance Z.sub.NW may be set for a bonding operation to maintain the power level P.sub.L or the impedance Z.sub.L at a desired predetermined level.

REFERENCES:
patent: 4970656 (1990-11-01), Lo et al.
patent: 5046654 (1991-09-01), Yamazaki et al.
patent: 5184605 (1993-02-01), Grzeszykowshi

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