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1. WO2020112207 - SWITCHED-CAPACITOR POWER CONVERSION SYSTEM AND CONTROL METHOD

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

WHAT IS CLAIMED IS:

1. A system comprising :

a first switched-capacitor converter including a plurality of switches connected in series; a second switched-capacitor converter; and

a third switched-capacitor converter connected in parallel with the second switched-capacitor converter between a common node of two switches of the plurality of switches and a load, the second switched-capacitor converter and the third switched-capacitor converter both including inductors.

2. The system of claim 1, wherein the plurality of switches of the first switched-capacitor converter includes:

a first switch, a second switch, a third switch and a fourth switch connected in series between an input voltage bus and ground, and wherein the first switched-capacitor converter further includes a first flying capacitor connected between a common node of the first switch and the second switch, and a common node of the third switch and the fourth switch, the second switched-capacitor converter and the third switched-capacitor converter being connected in parallel between a common node of the second switch and the third switch, and the load.

3. The system of claim 1, wherein the second switched-capacitor converter includes:

a fifth switch, a sixth switch, a seventh switch and an eighth switch connected in series between an input voltage bus and ground, and wherein the second switched-capacitor converter further includes a second flying capacitor connected between a common node of the fifth switch and the sixth switch, and a common node of the seventh switch and the eighth switch, and a first inductor connected between a common node of the sixth switch and the seventh switch, and the load.

4. The system of claim 1, wherein the third switched-capacitor converter includes:

a ninth switch, a tenth switch, an eleventh switch and a twelfth switch connected in series between an input voltage bus and ground, and wherein the third switched-capacitor converter further includes a third flying capacitor connected between a common node of the ninth switch and the tenth switch, and a common node of the eleventh switch and the twelfth switch, and a second inductor connected between a common node of the tenth switch and the eleventh switch, and the load.

5. The system of claim 1, wherein the second switched-capacitor converter includes:

a fifth switch, a sixth switch, a seventh switch and an eighth switch connected in series between an input voltage bus and ground, and wherein the second switched-capacitor converter further includes a second flying capacitor and a first inductor connected in series between a common node of the fifth switch and the sixth switch, and a common node of the seventh switch and the eighth switch.

6. The system of claim 1, wherein the third switched-capacitor converter includes:

a ninth switch, a tenth switch, an eleventh switch and a twelfth switch connected in series between an input voltage bus and ground, and wherein the third switched-capacitor converter further includes a third flying capacitor and a second inductor connected in series between a common node of the ninth switch and the tenth switch, and a common node of the eleventh switch and the twelfth switch.

7. The system of any one of claims 1-6, wherein the second switched-capacitor converter and the third switched-capacitor converter are configured to operate at 180 degrees out of phase from one another.

8. The system of any one of claims 1-6, wherein each of the first switched-capacitor converter, the second switched-capacitor converter and the third switched-capacitor converter is configured as a 2: 1 step-down power converter.

9. The system of any one of claims 1-6, wherein switches of the first switched-capacitor converter, the second switched-capacitor converter and the third switched-capacitor converter are configured to operate at a duty cycle of approximately 50%.

10. The system of any one of claims 1-6, wherein switches of the second switched-capacitor converter and the third switched-capacitor converter are configured to operate at a duty cycle greater than or equal to 50%, and switches of the first switched-capacitor converter are configured to operate at a duty cycle less than 50%.

11. A system comprising :

a plurality of switched-capacitor power conversion stages connected in cascade between a power source and a load, a first switched-capacitor power conversion stage of the plurality of switched-capacitor power conversion stages directly connected to the load, the first switched-capacitor power conversion stage including a plurality of first switched-capacitor power converters connected in parallel, each of which including an inductor, wherein a second switched-capacitor power conversion stage of the plurality of switched-capacitor power conversion stages is connected to the first switched-capacitor power conversion stage, the second switched-capacitor power conversion stage including a plurality of second switched-capacitor power converters, each of which connected to inputs of two parallel-connected first switched-capacitor power converters.

12. The system of claim 11, wherein the system is a two-stage switched-capacitor power conversion system.

13. The system of claim 12, wherein the second switched-capacitor power conversion stage includes a first switched-capacitor converter comprising a plurality of switches connected in series, and the first switched-capacitor power conversion stage includes a second switched-capacitor converter and a third switched-capacitor converter connected in parallel between the first switched-capacitor converter and the load.

14. The system of claim 13, wherein the first switched-capacitor converter includes:

a first switch, a second switch, a third switch and a fourth switch connected in series between an input voltage bus and ground; and

a first flying capacitor connected between a common node of the first switch and the second switch, and a common node of the third switch and the fourth switch, the second switched-capacitor converter and the third switched-capacitor converter connected in parallel between a common node of the second switch and the third switch and the load.

15. The system of claim 14, wherein the second switched-capacitor converter includes: a fifth switch, a sixth switch, a seventh switch and an eighth switch connected in series between the common node of the second switch and the third switch, and ground;

a second flying capacitor connected between a common node of the fifth switch and the sixth switch, and a common node of the seventh switch and the eighth switch; and

a first inductor connected between a common node of the sixth switch and the seventh switch and the load.

16. The system of claim 13, wherein the first switched-capacitor converter includes:

a first switch, a second switch, a third switch and a fourth switch connected in series between an input voltage bus and ground; and

a first flying capacitor connected between a common node of the first switch and the second switch, and a common node of the third switch and the fourth switch, the second switched-capacitor converter and the third switched-capacitor converter connected in parallel between a common node of the second switch and the third switch and the load.

17. The system of claim 16, wherein the second switched-capacitor converter includes: a fifth switch, a sixth switch, a seventh switch and an eighth switch connected in series between the common node of the second switch and the third switch, and ground; and

a second flying capacitor and a first inductor connected in series between a common node of the fifth switch and the sixth switch, and a common node of the seventh switch and the eighth switch.

18. A method comprising:

configuring a first switched-capacitor converter to operate at a first duty cycle; and configuring a second switched-capacitor converter and a third switched-capacitor converter to operate at a second duty cycle, wherein the second switched-capacitor converter and the third switched-capacitor converter are connected in parallel and operate at 180 degrees out of phase from one another.

19. The method of claim 18, wherein:

the first switched-capacitor converter comprises:

a first switch, a second switch, a third switch and a fourth switch connected in series between an input voltage bus and ground; and

a first flying capacitor connected between a common node of the first switch and the second switch, and a common node of the third switch and the fourth switch, the second switched-capacitor converter and the third switched-capacitor converter connected in parallel between a common node of the second switch and the third switch and a load; and

the second switched-capacitor converter comprises:

a fifth switch, a sixth switch, a seventh switch and an eighth switch connected in series between the common node of the second switch and the third switch, and ground;

a second flying capacitor connected between a common node of the fifth switch and the sixth switch, and a common node of the seventh switch and the eighth switch; and

a first inductor connected between a common node of the sixth switch and the seventh switch and the load.

20. The method of claim 18, wherein:

the first switched-capacitor converter comprises:

a first switch, a second switch, a third switch and a fourth switch connected in series between an input voltage bus and ground; and

a first flying capacitor connected between a common node of the first switch and the second switch, and a common node of the third switch and the fourth switch, the second switched-capacitor converter and the third switched-capacitor converter connected in parallel between a common node of the second switch and the third switch and a load; and

the second switched-capacitor converter comprises:

a fifth switch, a sixth switch, a seventh switch and an eighth switch connected in series between the common node of the second switch and the third switch, and ground; and a second flying capacitor and a first inductor connected in series between a common node of the fifth switch and the sixth switch, and a common node of the seventh switch and the eighth switch.