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公开(公告)号:US10283989B1
公开(公告)日:2019-05-07
申请号:US15884092
申请日:2018-01-30
Applicant: Apple Inc.
Inventor: Roderick B. Hogan , Evan D. Ragsdale , Nathan A. Johanningsmeier
Abstract: A power converter provides a first output voltage and a second output voltage in accordance with a control input, wherein the first output voltage is higher than the second output voltage. A switch that is series coupled between i) an energy reservoir node and ii) a power supply node or a power return node. A charge maintenance circuit is coupled to the energy reservoir node, and when the switch is closed can maintain a selected amount of charge in or a selected voltage across an energy reservoir element that may be coupled to the energy reservoir node. Other aspects are also described and claimed.