Switching amplifier circuitry
AssigneeCirrus Logic, Inc.
InventorsMatthew Beardsworth, John L. Melanson
Life of this patent
Estimating the term…
Abstract
Switching amplifier circuitry for driving an inductive load, the switching amplifier circuitry comprising modulator circuitry and output stage circuitry, wherein the switching amplifier circuitry is configured to: while the modulator circuitry is outputting a modulated output signal that gives rise to ripple current in the load: adjust a switching frequency of the modulator circuitry over a predetermined range of frequencies; monitor a power of the switching amplifier circuitry as the switching frequency is adjusted over the predetermined range of frequencies; and select, as an operational switching frequency for the modulator circuitry, a frequency within the predetermined range of frequencies at which the monitored power meets a predefined criterion.
Claims28
Switching amplifier circuitry for driving a load, the switching amplifier circuitry comprising:
- modulator circuitry;
- and
- output stage circuitry, wherein the switching amplifier circuitry is configured to:
- while the modulator circuitry is outputting a modulated output signal that gives rise to ripple current in the load:
- adjust a switching frequency of the modulator circuitry over a predetermined range of frequencies;
- monitor an input power to the switching amplifier circuitry as the switching frequency is adjusted over the predetermined range of frequencies;
- and
- select, as an operational switching frequency for the modulator circuitry, a frequency within the predetermined range of frequencies at which the monitored input power meets a predefined criterion.
Switching amplifier circuitry for driving a load, the switching amplifier circuitry comprising:
- modulator circuitry;
- output stage circuitry;
- and
- power loss comparator circuitry,
- wherein the power loss comparator circuitry is configured to perform a comparison of a power loss associated with a ripple current in the load to a switching loss model for the switching amplifier circuitry,
- wherein the power loss associated with the ripple current in the load is based on a ripple power loss model for the switching amplifier circuitry, wherein the ripple power loss model is configured to generate an estimated ripple power loss measurement for a current operational frequency of the switching amplifier circuitry based on an inductance and/or a resistance of the load,
- and wherein the switching amplifier circuitry is configured to control a switching frequency of the modulator circuitry based on the comparison.
Dependencies are inferred from the claim text.