Converters
AssigneeChloride Group Limited
InventorsDavid Gurwicz, Keith Pacey
Life of this patent
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Abstract
A converter includes a resonant oscillatory tank circuit comprising a capacitor and an inductor, at least one switching circuit including a solid state switching device in parallel with a diode connected to apply a predetermined potential difference from a DV supply to the inductor, and synchronizing means responsive to the oscillation of the oscillatory circuit for switching on the switching means for a fraction of a cycle when the instantaneous value of the oscillatory potential difference across the inductor is already not less than a predetermined value, to delay the fall of the said oscillating potential difference and inject energy from the supply into the oscillatory circuit, and a load circuit coupled or connected to the tank circuit in series with the inductor.
Claims11
A DC-AC converter of push-pull form comprising:
- a direct current (D.C.) input supply having terminals providing a D.C. supply voltage;
- a load circuit including a transformer;
- an oscillatory circuit including at least one capacitor and an inductor connected to a primary winding of the load transformer;
- a solid-state switching circuit including at least one switching device connected in series with said inductor across said D.C. terminals;
- and
- means for synchronizing the operation of the switching circuit to the oscillation of the oscillatory circuit, said synchronizing means rendering said switching circuit non-conductive to allow the oscillatory circuit to oscillate freely for part of a cycle to transfer energy from the inductor to the capacitor to charge the latter to a certain condition in which the voltage across the inductor is substantial relative to that across one of said switching devices, which then has negligible voltage thereacross, and only then actuate said one switching device to a conductive state to connect the inductor across half of the D.C. supply whereupon the inductor receives and stores energy from said supply;
- wherein said load circuit is coupled to the oscillatory circuit in series with said inductor.
Dependencies are inferred from the claim text.