CIRCUIT FOR DETERMINING AND CONTROLLING THE CURRENT SUPPLIED TO AN ADJUSTABLE RESISTANCE LOAD

摘要

A bridge circuit with a current switch connected to the output terminals thereof. The current switch is connected to two current paths, one of which acts to develop a voltage in accordance with the rate of electrical conduction of the current switch. The last mentioned path has a variable resistor therein which can be set to vary the rate of the voltage development. A second current switch is connected to be responsive to the voltage developed but in being so connected the second current switch can be made to fire at the same time with respect to each applied half cycle of power, irrespective of what rate the first current switch conducts. A further current switch is coupled to the second current switch to connect in a heating load when the second current switch conducts.