Coil driven switched capacitor and controller for wired and inductive charging
AssigneeApple Inc.
InventorsZhiyuan Hu, Jizhen Fu, Weihong Qiu
Life of this patent
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Abstract
A coil driven switched capacitor (CDSC) converter can include at least one input coil that receives input power; first and second cascades of one or more CDSC cells, an input of each cascade being coupled to the at least one coil, and an output of each cascade being coupled to an output bus of the CDSC converter. The at least one input coil can include a first inductor coupled between a wired input power source and the first cascade of one or more CDSC cells and a second inductor coupled between the wired input power source and the second cascade of one or more CDSC cells. The at least one input coil can further include a wireless power receiver coil.
Claims34
A coil driven switched capacitor (CDSC) converter comprising:
- at least one input coil configured to receive input power;
- a first cascade of two or more CDSC cells, an input of the first cascade being coupled to a first terminal of the at least one input coil, and an output of the first cascade being coupled to an output bus of the CDSC converter;
- and
- a second cascade of two or more CDSC cells coupled to a second terminal of the at least one input coil and an output of the second cascade being coupled to the output bus of the CDSC converter.
A wireless power receiver comprising:
- a wireless power receiver coil configured to have an AC receiver input voltage induced thereacross by a wireless power transmitter;
- a first rectifier having an input coupled to a first terminal of the wireless power receiver coil;
- a second rectifier having an input coupled to a second terminal of the wireless power receiver coil;
- a first cascade of two or more rectifier driven switched capacitor (RDSC) cells coupled between an output of the first rectifier and an output bus, each RDSC cell comprising a flying capacitor and a plurality of associated switching devices;
- and
- a second cascade of two or more RDSC cells coupled between an output of the second rectifier and the output bus;
- each RDSC cell comprising a flying capacitor and a plurality of associated switching devices;
- whereby the first and second cascades of RDSC cells allow selecting a voltage or current conversion ratio to reduce losses.
Dependencies are inferred from the claim text.