Constant (optimum) power electrophoresis

The electrical field used in electrophoresis can be produced by various types of electrical power supplies. The optimum power supply, with respect to the ratio of migration velocity to heating, produces the maximum voltage gradient consistent with the maximum allowable rate of heating. The voltage and current change only to compensate for changes in the resistance of the electrophoretic system. A circuit is given which produces such constant power and its operation is compared with other types of regulation.