Programmable ultrasonic power supply

Details Programmable ultrasonic power supply Programmable ultrasonic power supply

1984-07-17

1987-09-29

Godici, Nicholas P.

Metal fusion bonding

Means to apply vibratory solid-state bonding energy to work

228 45, 228102, 228110, 310317, 323212, 156351, B23K 106, B23K 2010

Patent

active

046964258

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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patent: 4438880 (1984-03-01), Smith et al.
patent: 4606490 (1986-08-01), Chan et al.

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