Regulating circuit

A regulator circuit provides a constant direct current to a load, for example, a string of batteries. The current is regulated to be independent of the load and supply voltage variations and can be operated under open or short circuited load conditions for an indefinite time without damage. The generator includes a pair of SCRs in a full wave current supply which provide phase angle controlled current through the load and a sensing resistor in series therewith. The voltage drop across the resistor, which is proportional to the output current of the generator, is averaged by an RC network and compared with a reference voltage to develop an error signal which is amplified and conditioned to control the firing angle of the SCRs. Additionally, the regulator functions to supply a constant voltage output across the resistor.