Programmable ultrasonic power supply
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United States of America Patent
Stats
-
Sep 29, 1987
Grant Date -
N/A
app pub date -
Jul 17, 1984
filing date -
Jul 17, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ultrasonic generator for providing power to a bonding apparatus having a bonding horn which is brought into contact with respective conductive pads and which carries a wire to be dispensed for interconnection therebetween includes a circuit for applying a voltage at an ultrasonic frequency to the bonding horn to produce a bonding current in the horn, and a monitor for monitoring the bonding current applied to the bonding horn. A circuit is provided for maintaining a zero phase difference between the applied voltage and the monitored current. In addition, a circuit is provided for continuously monitoring and controlling the current which is delivered to the bonding horn to produce a current waveform of a predetermined controllable pattern.
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