Electronic control circuit for a cathodic protection system

Details Electronic control circuit for a cathodic protection system Electronic control circuit for a cathodic protection system

1987-09-11

1988-10-25

Andrews, R. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204228, C25F 1300

Patent

active

047801891

ABSTRACT:
An electronic control circuit for a vehicle cathodic protection system is disclosed. A battery of the vehicle is utilized to supply electrical energy to the circuit. The circuit includes a first voltage comparator which compares the voltage level of the vehicle battery with a predetermined reference level. If the voltage level of the vehicle battery falls below the reference level, the first voltage comparator disables the control circuit so as to prevent an undesirable drain on the vehicle battery form occurring. An oscillator provides a pulsating output signal. When the output pulses from the oscillator are positive, a transistor switch is turned on to cause electric current to flow to one or more sacrificial anodes. When the output pulses are negative, the transistor switch is turned off, thereby preventing electric current from flowing to the sacrificial anodes. Thus, the control circuit is only energized intermittently. A pilot light is responsive to the positive output pulses from the oscillator to generate a visual indication when the control circuit is energized. A temperature regulator is provided to disable the control circuit, by means of a second voltage comparator, when the ambient temperature is too high.

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