Taper type of battery charger

An automatic taper charging battery charger comprising, a pair of input terminals for connection to a source of a.c. voltage, a transformer having a primary and a pair of secondary windings, a d.c. controlled variable reactor having controlled and control windings, said primary and controlled windings connected in series to said pair of input terminals, a first rectifier coupled to one of said pair of secondary windings and a second rectifier coupled to the other of said pair of secondary windings, a pair of output terminals connected to said first rectifier, and a control circuit connected to said second rectifier, said control circuit having a voltage sensing network coupled to said output terminals and having an output circuit coupled to said control winding for controlling the impedance of said d.c. controlled variable reactor, said control circuit including a linear operational amplifier for controlling the current in said output circuit by proportionally varying the impedance of a semiconductive impedance device in accordance with the voltage appearing on said output terminals, and switching means for normally establishing a float charging rate and for selectively establishing an equalizing charging rate for reconditioning a seldom used battery and for conditioning a new battery.