公开(公告)号：US10917050B2

公开(公告)日：2021-02-09

申请号：US16194039

申请日：2018-11-16

Applicant: Apple Inc.

Inventor： Roderick B. Hogan ,  Evan D Ragsdale ,  Kavitha Srinivasan

IPC: H03F1/02 ,  H03F3/187 ,  H03F3/217 ,  H03F3/21 ,  H03F3/213 ,  H02M3/158

Abstract: A power converter produces power at a greater voltage than provided by a power source, while drawing power from the power source, wherein the power converter has a variable input current limit or a variable input power limit. One or more audio amplifiers are configured into i) drawing power from the power source bypassing the power converter and ii) drawing power from the power converter, according to audio signal amplitude, during audio playback and in accordance with an audio signal being amplified. A load of each amplifier is determined for when the amplifier is drawing power from the power source bypassing the power converter. The variable input limit of the power converter is adjusted in accordance with the determined load, during the audio playback. Other aspects are also described and claimed.