Dual converter based single-stage battery charging system and control method
AssigneeHalo Microelectronics International
InventorRui Liu
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Abstract
A single-stage battery charging system includes a hybrid converter comprising a plurality of first power switches connected in series, an inductor and a first flying capacitor, wherein the inductor is connected to a midpoint of the plurality of first power switches, a switched capacitor converter comprising a plurality of second power switches connected in series, and a second flying capacitor, and an isolation switch coupled between the midpoint of the plurality of first power switches and a midpoint of the plurality of second power switches.
Claims26
A single-stage battery charging system comprising:
- a hybrid converter comprising a plurality of first power switches connected in series, an inductor and a first flying capacitor, wherein the inductor is connected to a midpoint of the plurality of first power switches;
- a switched capacitor converter comprising a plurality of second power switches connected in series, and a second flying capacitor;
- and
- an isolation switch comprising two back-to-back connected transistors, wherein the isolation switch is directly coupled to the inductor and the midpoint of the plurality of first power switches, and coupled to a midpoint of the plurality of second power switches.
A method comprising:
- configuring a single-stage battery charging system to provide power for a battery and a plurality of system loads coupled to a system voltage bus, the single-stage battery charging system comprising a hybrid converter, a switched capacitor converter and an isolation switch;
- configuring the hybrid converter as a three-level boost converter in response to a first operating mode;
- configuring the hybrid converter as a three-level buck converter in response to a second operating mode;
- configuring the hybrid converter, the switched capacitor converter and the isolation switch to form a dual-phase switched capacitor converter operating in a 2:1 charge pump mode in response to a third operating mode;
- and
- configuring the hybrid converter, the switched capacitor converter and the isolation switch to form the dual-phase switched capacitor converter operating in a 1:2 charge pump mode in response to a fourth operating mode.
A battery charging system comprising:
- a switched capacitor converter comprising a plurality of first power switches connected in series between a first voltage bus and ground, and a first flying capacitor, wherein and the first voltage bus is coupled to a battery through a switch and coupled to an output of a wireless charging path and an output of a high voltage direct charging path;
- a hybrid converter comprising a plurality of second power switches connected in series between the first voltage bus and the ground, an inductor and a second flying capacitor, wherein the inductor is connected to a midpoint of the plurality of second power switches and coupled to an output of a universal serial bus (USB);
- and
- an isolation switch comprising two back-to-back connected transistors, wherein the isolation switch is directly coupled to the inductor and the midpoint of the plurality of second power switches, and coupled to a midpoint of the plurality of first power switches.
Dependencies are inferred from the claim text.