O a load circuit arrangements for supplying an alternating current potential t

Claim 1

A circuit for supplying electric power to an inductive load which comprises a gate controlled electronic valve and a switch both connected in series with the load to deliver thereto electric current from an electric power source when said switch is in a closed state and said electronic valve is in a conducting state, and means defining a pulse-forming network energized by said electric power source and connected to the gate of said electronic valve to generate and apply thereto a pulse signal in the form of a sequence of electrical pulses of predetermined polarity operable to trigger said electronic valve into a conducting state when said switch is closed to allow current flow through the valve, said pulse-forming network being operable to generate said sequence of pulses independently of the state of said switch, said pulse-forming network including circuit elements operable to derive a square wave signal from a sinusoidal alternating current source, and circuit elements connected to define a differentiator network to which said square wave signal is applied, said differentiator network being operable to derive from said square wave signal a pulse signal corresponding to the differentiated wave shape of the square wave signal and constituting said sequence of pulses applied to the gate of the electronic valve.