Differential output inductor for class D amplifier
AssigneeVersatile Power, Inc.
InventorsAlexandr Ikriannikov, David Hoffman, Noah A. Wilson
Life of this patent
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Abstract
A circuit includes a first input terminal for receiving a first pulsed voltage and a second input terminal for receiving a second pulsed voltage. The circuit further includes a load and an LC filter. The LC filter includes a coupled inductor pair that includes a first winding and a second winding magnetically coupled to each other. The first winding is coupled between the first input terminal and the load, and the second winding is coupled between the second input terminal and the load. A frequency of a first current flowing through the first winding is increased by the second pulsed voltage applied to the second winding.
Claims18
A circuit comprising:
- a first input terminal for receiving a first pulsed signal;
- a second input terminal for receiving a second pulsed signal;
- a load;
- and
- a plurality of LC filters connected to each other in series, wherein one of the plurality of LC filters comprises a coupled inductor that comprises a first winding and a second winding that are at least partially magnetically coupled to each other in a manner that both couples the first pulsed signal and the second pulsed signal and presents differential inductance to the first pulsed signal and the second pulsed signal;
- and
- wherein the second pulsed signal is a phase-shifted signal of the first pulsed signal, and wherein the coupling of the first pulsed signal and the second pulsed signal operates to combine the first pulsed signal and the second pulsed signal into one signal with less ripple than either the first pulsed signal and the second pulsed signal have separately.
A method of filtering a signal, said method comprising:
- providing a plurality of LC filters connected to each other in series, wherein one of the plurality of LC filters comprises a coupled inductor that comprises a first winding and a second winding;
- applying a first pulsed signal to the first winding;
- applying a second pulsed signal to the second winding, wherein the first and second windings are at least partially magnetically coupled in a manner that both couples the first pulsed signal and the second pulsed signal and presents differential inductance to the first pulsed signal and the second pulsed signal,
- providing an output current to a load coupled between the first and second windings, the output current being sourced from the first winding and sunk at the second winding,
- wherein the second pulsed signal is a phase-shifted signal of the first pulsed signal, and wherein the coupling of the first pulsed signal and the second pulsed signal operates to combine the first pulsed signal and the second pulsed signal into one signal with less ripple than either the first pulsed signal and the second pulsed signal have separately.
Dependencies are inferred from the claim text.