Load control circuit with different input voltages

Claim 1

A control circuit controlling operation of a DC load and comprising; input terminal means that receive any one of a plurality of different input voltage signals including AC or DC signals, control circuit means controlling operation of said DC load from said input voltage signal and including first means responsive only to said input DC voltage signal to control said load, second means responsive only to said input AC voltage signal for controlling said load, said first means comprising a first electrical energizing means and said second means comprising a second electrical energizing means, a transformer and means coupling the transformer to the input terminal means, a rectifier coupled between the transformer and load, means responsive to application of a DC input signal to energize said first electrical energizing means only to in turn energize said DC load directly, and means responsive to application of an AC input signal to energize said second electrical energizing means only to in turn couple the AC signal via the transformer and rectifier to the DC load, said means responsive to application of the DC and AC input signals being operated on a mutually exclusive basis, said second means including one and another electrical energizing means, said one thereof having a delay means at the input thereof, said one and another electrical energizing means being operated at different Ac voltages.