Battery powered explosive system with relaxation oscillation in charging circuit

Claim 1

Electrical apparatus comprising: a source of electrical energy; a transformer having a primary winding connected to said source and a secondary winding; first diode means and electrical energy storage means connected together in series across said secondary winding to store energy generated by the current flowing through said primary winding; a solid state switch oscillator connected to said source and said transformer to periodically interrupt flow from said source through said primary winding, said oscillator including; a first transistor having collector and emitter terminals in series with said primary winding, said transistor having alternate conductive and nonconductive intervals to periodically interrupt the current flowing from said primary winding; a first voltage divider network connected across said first transistor and said primary winding, said first voltage divider network including second diode means connected from said first voltage divider network to the junction between said primary winding and said first transistor to direct current from said winding iN a predetermined manner; and a second voltage divider network connected across said source of electrical energy, said second voltage divider network including a second transistor having alternate conductive and nonconductive intervals to respectively control the conductive and nonconductive intervals of said first transistor whereby the flow of current from said source to said primary winding is periodically interrupted causing current to flow in an oscillatory manner through said primary winding.