Regulating the power supply to electrophoresis cell - using different control modes governed by voltage, current and power readings

摘要

A method of regulating the power supply to an electrophoresis cell, in which the resistance during the process, is as follows: at least three reference voltages are formed, corresponding respectively to the current, voltage and power which should be supplied to the cell, and in addition three other voltages are formed, corresponding respectively to the actual values of these three parameters, each actual is continuously compared with the corresponding reference value to give a difference signal, during a first, predetermined difference signal as the regulating value for this power supply, as soon as one of the difference signals passes through the zero point, an automatic change-over to a second control mode takes place, in which this difference signal is used as the regulating value for the power supply.