Hooker Chemicals & Plastics Corporation

Carmelo J Amato

James H Galloway

An industrial plating system operative from a relatively high voltage, 60 Hz, three phase a-c source for providing a relatively low voltage pulsed d-c for delivering currents above around 1,000 amperes to plating load and including amplitudes of 3,000 to 5,000 amperes, and including a controlled rectifier operative with the a-c source to provide a rectified d-c output voltage of a preselected high amplitude, an inverter operative with the controlled rectifier and situated at substantially the same physical location for providing a pulsed a-c output of a preselected width and a-c frequency, the a-c frequency being from around 300 Hz to 3000 Hz, a high frequency rectifier operative with the inverter for providing plating loads with a rectified pulsed d-c having d-c amplitude and a preselected pulsed d-c frequency, the pulsed d-c frequency being greater than the preselected a-c frequency, the high frequency rectifier having a high frequency step down power transformer and a pair of high speed diodes operative in plating systems where the pulsed a-c has a peak amplitude of around 150 volts to 550 volts to provide the pulsed d-c with an amplitude of around 2 volts to 50 volts, and an a-c bus having lines of opposite polarity connecting the pulsed a-c to the input of the high frequency rectifier the a-c bus having a gauge permitting the lines of opposite polarity to be twisted together to minimize inductive and resistive effects of the a-c bus.

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Cupertino, CA, United States of America

Carmelo J Amato