Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1987-07-27
1988-10-11
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204109, 204278, C25C 100
Patent
active
047769319
ABSTRACT:
In an electrolytic method for removing metal from solution, a "plating" voltage applied to the electrodes is reduced to a lower, "standby" value if the current drawn by the solution falls below a threshold value. This "standby" voltage, however, is periodically restored to its higher, "plating" value for brief intervals so that the current at the higher voltage can periodically be sampled. If it is found that the current drawn by the solution at the higher voltage is once again above the threshold value (indicating that new metal has been added to the solution), the electrode voltage is kept at the higher level until the solution is again depleted of metal to the point that the current drops below the threshold. If, during the brief sampling interval, the current is still below the threshold, the electrode voltage is returned to its lower, "standby" value and another current sample is taken at the next interval. The electroplating power supply desirably provides a well regulated output voltage that is variable over a range of low voltages despite its use of simple conventional regulator circuits which are unable, by themselves, to provide output voltages in this range.
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Fairchild Linear Products Division Data Book, 1982, pp. 2-94-2-101.
Andrews R. L.
Lab Systems, Inc.
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