Independent regulation of multiple outputs in a soft-switching multiple-output flyback converter
AssigneeKoninklijke Philips Electronics N.V.
InventorLaurence Bourdillon
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Abstract
A soft-switching multiple output fly-back converter provides output cyclying sequence control. Each of the multiple output circuits includes a bi-directional switching circuit which provides for flexible reconfiguration of the output cycling sequence. Further, the novel circuit allows each of the individual outputs, or any combination thereof, to be independently turned ‘off’ (i.e., removed from the cycling sequence) and re-introduced (i.e., turned ‘on’ again) at a later time as needed.
Claims14
A soft-switching flyback converter having a primary and secondary side for providing output cycling sequence control comprising:
- a power transformer having at least a primary winding and a secondary winding;
- an input circuit on said primary side for coupling an input DC voltage to said power transformer primary winding, said input circuit including a primary side switch;
- and
- a plurality of output channels on said secondary side coupled to said power transformer secondary winding, each of said plurality of output channels including secondary side bi-directional switching means connected to said power transformer secondary winding;
- wherein each of said secondary side bi-directional switching means comprises a pair of sub-switches having corresponding body diodes, said sub-switches being arranged such that the corresponding body diodes are oppositely conductive, and wherein said secondary side bi-directional switching means associated with each of said plurality of output channels controls an output cycling sequence of said plurality of output channels irrespective of an output voltage of each of said plurality of output channels.
A method for providing output cycling sequence control, said method comprising the steps of:
- providing a power transformer having at least a primary winding and a secondary winding;
- providing an input circuit on said primary side for coupling an input DC voltage to said power transformer primary winding, said input circuit including a primary side switch;
- providing a plurality of output channels on said secondary side coupled to said power transformer secondary winding, each of said plurality of output channels including secondary side bi-directional switching means connected to said power transformer secondary winding, each of said bi-directional switching means comprising a pair of sub-switches having corresponding body diodes, said sub-switches being arranged such that the corresponding body diodes are oppositely conductive;
- and
- providing secondary side control means for controlling an output cycling sequence of said plurality of output channels irrespective of an output voltage of each of said plurality of output channels.
Dependencies are inferred from the claim text.