Power supply device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorWanleng Ang
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Abstract
A ripple current characteristic of a magnetic-coupling-type multi-phase converter includes a local minimum of the ripple current, with respect to a change of the duty ratio. In a region and another region, the ripple current is larger than a predetermined level. In the case where it is necessary to enhance the responsiveness of the multi-phase converter, a control circuit sets a voltage command value for the multi-phase converter, in accordance with the ripple current characteristic, so that the duty ratio is limited to a value that makes the ripple current larger than the predetermined level.
Claims7
A power supply device comprising:
- a multi-phase converter including a plurality of chopper circuits connected in parallel between a power supply line connected to a load and a DC power supply;
- and
- a control circuit controlling operation of said plurality of chopper circuits,
- said plurality of chopper circuits each including at least one switching element and a reactor disposed to pass electric current depending on operation of said switching element,
- respective said reactors of said chopper circuits being arranged to be magnetically coupled to each other, and
- in accordance with a characteristic obtained in advance of a ripple current of said multi-phase converter, with respect to a duty ratio of said switching element, said control circuit limiting said duty ratio so that said duty ratio is included in a specific range in which said ripple current is larger than a predetermined level.
Dependencies are inferred from the claim text.