Patent ID: 11888410
Assignee: APPLE INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A method for power conversion, comprising:
measuring a voltage level of an electrical load connected between terminals of a rectifier that connects the electrical load to secondary windings of a transformer;
selecting a modulation scheme from among two or more modulation schemes based on the measured voltage level of the electrical load, wherein each of the two or more modulation schemes is a periodic sequence of multiple modulation states with a period that corresponds to a whole number of periods of a multilevel voltage signal on the transformer, wherein a modulation state specifies which of the plurality of switching devices is in an on state, and wherein a first modulation scheme of the two or more modulation schemes includes at least one modulation state that is different than the modulation states of a second modulation scheme of the two or more modulation schemes; and
controlling a set of switches of the rectifier to rectify the multilevel voltage signal on the transformer using the selected modulation scheme.