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US 7,253,683 B2Granted
Method and apparatus for reducing ripple in class D amplifiers
AssigneeRGB Systems, Inc.
InventorEric Mendenhall
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Abstract
Class D amplifiers are used for their high efficiency, but they have some undesirable characteristics, one of these being the residual switching frequency ripple. Embodiments of the present invention comprise methods and apparatuses for reducing the switching frequency ripple using a technique known herein as ripple steering. A secondary output is added to the amplifier for the purpose of steering the switching ripple away from the main output thus substantially relieving the main output from a major artifact of prior art Class D amplifiers.
Claims11
A class D amplifier comprising:
- a first set of switches coupled together to form a first switching node;
- a first core comprising a first coupled inductor circuit having a first primary winding and a first secondary winding, wherein a first end of said first primary winding is coupled to said first switching node, a second end of said first secondary winding is coupled to a second end of said first primary winding, said first secondary winding is back-wound from said second end to a first end of said first secondary winding in said first core;
- a first capacitor coupled to said second end of said first primary winding and to ground;
- and
- an auxiliary output circuit coupled to said first end of said first secondary winding.
2 more elements
Dependencies are inferred from the claim text.