Apparatus and method for automatically adjusting power output of an ultrasonic generator

摘要

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 ZT, the transducer impedance in free air ZFA and the load impedance ZL may be calculated and the network impedance ZNW may be set for a bonding operation to maintain the power level PL or the impedance ZL at a desired predetermined level.