{TAIL ~ The invention} 2 comprising, in addition, a start up circuit connected in circuit with an input source voltage of the transformer to initially drive the pulse width modulator and {HEAD ~ the main power switch} and which is disabled by said non dissipative snubber means when the stepped down output voltage therefrom reaches a predetermined value 
{ TAIL ~ The invention } 2 comprising , in addition , a start up circuit connected in circuit with an input source voltage of the transformer to initially drive the pulse width modulator and { HEAD ~ the main power switch } and which is disabled by said non dissipative snubber means when the stepped down output voltage therefrom reaches a predetermined value
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