SOURCE OF DC VOLTAGE Russian patent published in 2013 - IPC H02H7/12 

FIELD: electricity.

SUBSTANCE: device contains a overvoltage protection unit, switching device, phase current sensor, transformer, rectifier, ripple filter, output current sensor, lightning overvoltage protection unit, power supply transformer for protection units, rectifier for protection units, actuator of protection units, overvoltage protection unit, operating time counter, control unit, power supply transformer for control unit, power supply source, signal amplifying unit, protection unit, current control unit, mode select switch, active filter unit, voltage divisor, voltage follower and low-frequency active filter equipped with current controller, control unit of the current controller and time counter for availability of protection potential (current).

EFFECT: improvement in reliability of cathodic protection for underground metal facility, nonavailability of man-made interference induced by the source, reduction of DC source weight, nonavailability of pulsed current consumption from the supply mains at regulation of output current value, application of a simpler method for regulation of the stabilised output current and a simpler control structure diagram.

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