Solid state rectifier control unit

A rectifier control circuit comprising a transformer having a primary winding and a secondary winding, a thyristor having anode and gate electrodes connected to the secondary winding and an oscillator coupled with the transformer primary winding, the oscillator comprising a pair of parallel connected alternately conducting transistors, a switching transistor connected with and controlling the energization of the primary winding, the conductive state of the switching transistor being controlled by one of said transistors, and a capacitor timing circuit controlling the conduction of the other of said transistors, the timing circuit comprising a capacitor connected in series with a charging transistor and in parallel with a discharge circuit, the base of said charging transistor being connected to said switching transistor whereby the conductive state of the switching transistor determines the conductive state of the charging transistor.