Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1990-11-09
1992-04-07
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204109, 204228, C25C 100, C25C 700, C25C 706
Patent
active
051025132
ABSTRACT:
The improved power supply is controlled by a microprocessor which operates with instructions stored in software in a programmable read only memory within the unit. As the microprocessor operates, it constantly reads the conditions of the actual voltage, actual current, preset voltage and preset current at the electrodes of the plating system. The microprocessor makes adjustments to maintain the voltage at a preset level by outputting a digital signal to a digital-to-analog converter which changes the digital command into a voltage which is used to adjust an output transistor which controls the voltage to the electrodes. The microprocessor monitors the current draw and displays the current and voltage readings on a digital display. Signals received by the microprocessor are used in a virtually continuous comparison to preset current and voltage settings which are adjustable by variable resistors, and which determine a point at which insufficient metal is contained within the solution to continue the plating operation at which time a lockout condition is triggered. During lockout, no voltage is applied to the electrodes except when sampling is to occur. Frequency of sampling during lockout is determined by the microprocessor's reset function. The microprocessor will attempt to reset by switching on the plating voltage and monitoring the current drawn to determine if sufficient current is present to continue plating. If insufficient current is detected, the lockout condition will continue with the microprocessor resetting after another clock cycle.
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Fournier Eileen
Fournier Guy
Valentine Donald R.
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