Patent ID: 7884626
Filing Date: 2011-02-08
Classification: C23F,G08C

Abstract:
1. For a plurality of cathodic protection rectifiers coupled to an underground pipe or storage tank to prevent cathodic erosion thereof, a corresponding plurality of rectifier control circuits electrically connected to respective ones of said cathodic protection rectifiers to control the operation of said rectifiers, each one of said plurality of rectifier control circuits comprising: a central processing unit (CPU); a clock to supply clock control signals to said CPU; and means by which the clock control signals supplied by said clock to said CPU are synchronized with the clock control signals supplied by the clocks of the other ones of said plurality of rectifier control circuits, said CPU generating timed rectifier enable signals that are dependent upon said clock control signals, said rectifier enable signals causing said cathodic protection rectifier to be turned on during a first time period and causing said cathodic protection rectifier to be turned off during a second time period.