Resonant switched capacitor converter and power supply system

1 . A converter comprising:

a plurality of second capacitors coupled in series, wherein each of the second capacitors comprises:

a first end; and

a second end;

a first capacitor coupled in series to the second capacitors and comprising:

a third end; and

a fourth end;

a plurality of resonant systems, wherein each resonant system of the plurality of resonant systems corresponds to a respective one of the plurality of the second capacitors, and wherein each of the resonant systems comprises:

a resonant circuit;

a first switch system comprising:

a first connection end coupled to the first end;

a second connection end coupled to the third end; and

a third connection end; and

a second switch system comprising:

a fourth connection end coupled to the second end;

a fifth connection end coupled to the fourth end; and

a sixth connection end coupled to the third connection end through the resonant circuit; and

a control system coupled to the resonant systems and configured to:

control, based on a target output voltage gain switches in each first switch system and each second switch system to be turned on or turned off to enable the converter to obtain an output voltage gain equal to the target output voltage gain;

generate a drive signal for each switch in each resonant system based on the target output voltage gain; and

control, based on at least one different target output voltage gain, switches of the resonant systems to be turned on or turned off to cause the converter to obtain an output voltage gain equal to the at least one different target output voltage gain.

2 . The converter of claim 1 , wherein the first switch system further comprises:

a first switch comprising:

a fifth end configured as the first connection end; and

a sixth end; and

a second switch coupled to the first switch in series at the third connection end and comprising:

a seventh end coupled to the sixth end; and

an eighth end configured as the second connection end.

3 . The converter of claim 2 , wherein the second switch system further comprises:

a third switch comprising:

a ninth end configured as the fourth connection end; and

a tenth end; and

a fourth switch coupled to the third switch in series at the sixth connection end and comprising:

an eleventh end coupled to the tenth end; and

a twelfth end configured as the fifth connection end.

4 . The converter of claim 3 , wherein the resonant circuit comprises:

a resonant inductor; and

a resonant capacitor coupled to the resonant inductor in series,

wherein a first series connection point of the resonant circuit is coupled to a second series connection point of the resonant circuit through the resonant inductor and the resonant capacitor.

5 . The converter of claim 3 , further comprising:

an input end; and

an output end,

wherein the resonant systems comprise n resonant systems, wherein n is a positive integer greater than 1, wherein the second capacitors comprise n second capacitors coupled in series between the input end and the output end, wherein the n second capacitors comprise a first second capacitor coupled to the input end and an n th second capacitor coupled to the output end, and wherein the n resonant systems comprise an i th resonant system coupled in parallel to two ends of an i th second capacitor of the n second capacitors.

6 . The converter of claim 5 , wherein the target output voltage gain is a ratio of 1:1, and wherein the control system is further configured to:

control the first switch and the second switch in a first resonant system to be turned on;

control the third switch and the fourth switch in the first resonant system to be turned off; and

control each switch in each of a second resonant system to an n th resonant system to be turned off.

7 . The converter of claim 5 , wherein the target output voltage gain is a ratio of m:1, wherein m is a positive integer greater than 1 and less than n, and wherein the control system is further configured to:

control the first switch and the third switch in each of a first resonant system to an (m−1) th resonant system to be turned on and control the second switch and the fourth switch in each of the resonant systems to be turned off, or control the first switch and the third switch in each of the resonant systems to be turned off and control the second switch and the fourth switch in each of the resonant systems to be turned on;

control the first switch and the second switch in an m th resonant system to be turned on and control the third switch and the fourth switch in the m th resonant system to be turned off; and

control each switch in each of an (m+1) th resonant system to an n th resonant system to be turned off.

8 . The converter of claim 5 , wherein the target output voltage gain is a ratio of n:1, and wherein the control system is further configured to:

control the first switch and the third switch in each of a first resonant system to an (n−1) th resonant system to be turned on and control the second switch and the fourth switch in each of the resonant systems to be turned off or control the first switch and the third switch in each of the resonant systems to be turned off and control the second switch and the fourth switch in each of the resonant systems to be turned on; and

control the first switch and the second switch in an n th resonant system to be turned on and control the third switch and the fourth switch in the n th resonant system to be turned off.

9 . The converter of claim 5 , wherein the target output voltage gain is a ratio of (n+1):1, and wherein the control system is further configured to:

control the first switch and the third switch in each of the n resonant systems to be turned on and control the second switch and the fourth switch in each of the resonant systems to be turned off; or

control the first switch and the third switch in each of the resonant systems to be turned off and control the second switch and the fourth switch in each of the resonant systems to be turned on.

10 . The converter of claim 5 , wherein the resonant circuit comprises:

a resonant inductor; and

a resonant capacitor coupled to the resonant inductor in series,

wherein a first series connection point of the resonant circuit is coupled to a second series connection point of the resonant circuit through the resonant inductor and the resonant capacitor.

11 . A power supply system, comprising:

a power supply; and

a resonant switched capacitor converter coupled to the power supply and comprising:

a plurality of second capacitors coupled in series, wherein one resonant system corresponds to one second capacitor, and wherein each of the second capacitors comprises:

a first end; and

a second end;

a first capacitor coupled in series to the second capacitors and comprising:

a third end; and

a fourth end; and

a plurality of resonant systems corresponding to the second capacitors, wherein each of the resonant systems comprises:

a resonant circuit;

a first switch system comprising:

a first connection end coupled to the first end;

a second connection end coupled to the third end; and

a third connection end; and

a second switch system comprising:

a fourth connection end coupled to the second end;

a fifth connection end coupled to the fourth end; and

a sixth connection end coupled to the third connection end through the resonant circuit; and

a control system coupled to the resonant systems and configured to:

control, based on a target output voltage gain, switches in each first switch system and each second switch system to be turned on or turned off to enable the converter to obtain an output voltage gain equal to the target output voltage gain;

generate a drive signal for each switch in each resonant system based on the target output voltage gain; and

control, based on at least one different target output voltage gain, switches the resonant systems to be turned on or turned off to cause the converter to obtain an output voltage gain equal to the at least one different target output voltage gain.

12 . The power supply system of claim 11 , wherein the power supply comprises at least one photovoltaic array comprising a plurality of photovoltaic panels coupled in series.

13 . The power supply system of claim 11 , wherein the power supply comprises at least one energy storage system comprising an energy storage battery or a supercapacitor.

14 . The power supply system of claim 11 , wherein the resonant switched capacitor converter further comprises:

a first switch comprising:

a fifth end configured as the first connection end; and

a sixth end; and

a second switch coupled to the first switch in series at the third connection end and comprising:

a seventh end coupled to the sixth end; and

an eighth end configured as the second connection end.

15 . The power supply system of claim 11 , wherein the resonant circuit comprises:

a resonant inductor; and

a resonant capacitor coupled to the resonant inductor in series,

wherein a first series connection point of the resonant circuit is coupled to a second series connection point of the resonant circuit through the resonant inductor and the resonant capacitor.

16 . The power supply system of claim 11 , wherein the resonant switched capacitor converter further comprises:

an input end; and

an output end,

wherein the resonant systems comprise n resonant systems, wherein n is a positive integer greater than 1, wherein the second capacitors comprise n second capacitors coupled in series between the input end and the output end, wherein the n second capacitors comprise a first second capacitor coupled to the input end and an n th second capacitor coupled to the output end, and wherein the n resonant systems comprise an i th resonant system coupled in parallel to two ends of an i th second capacitor of the n second capacitors.

17 . The power supply system of claim 11 , wherein the target output voltage gain is a ratio of 1:1, and wherein the control system is further configured to:

control the first switch and the second switch in a first resonant system to be turned on;

control a third switch and a fourth switch in the first resonant system to be turned off; and

control each switch in each of a second resonant system to an n th resonant system to be turned off.

18 . The power supply system of claim 11 , wherein the target output voltage gain is a ratio of m:1, wherein m is a positive integer greater than 1 and less than n, and wherein the control system is further configured to:

control the first switch and a third switch in each of a first resonant system to an (m−1) th resonant system to be turned on and control the second switch and a fourth switch in each of the resonant systems to be turned off or control the first switch and the third switch in each of the resonant systems to be turned off and control the second switch and the fourth switch in each of the resonant systems to be turned on;

control the first switch and the second switch in an m th resonant system to be turned on and control the third switch and the fourth switch in the m th resonant system to be turned off; and

control each switch in each of an (m+1) th resonant system to an n th resonant system to be turned off.

19 . The power supply system of claim 11 , wherein the target output voltage gain is a ratio of n:1, and wherein the control system is further configured to:

control the first switch and a third switch in each of a first resonant system to an (n−1) th resonant system to be turned on and control the second switch and a fourth switch in each of the resonant systems to be turned off or control the first switch and the third switch in each of the resonant systems to be turned off and control the second switch and the fourth switch in each of the resonant systems to be turned on; and

control the first switch and the second switch in an n th resonant system to be turned on and control the third switch and the fourth switch in the n th resonant system to be turned off.

20 . A power supply system, comprising:

a power supply comprising at least one photovoltaic array and at least one energy storage unit; and

a resonant switched capacitor converter coupled to the power supply and comprising:

a plurality of second capacitors coupled in series, wherein one resonant system corresponds to one second capacitor, and wherein each of the second capacitors comprises:

a first end; and

a second end;

a first capacitor coupled in series to the second capacitors and comprising:

a third end; and

a fourth end; and

a plurality of resonant systems corresponding to the second capacitors, wherein each of the resonant systems comprises:

a resonant circuit;

a first switch system comprising:

a first connection end coupled to the first end;

a second connection end coupled to the third end; and

a third connection end; and

a second switch system comprising:

a fourth connection end coupled to the second end;

a fifth connection end coupled to the fourth end; and

a sixth connection end coupled to the third connection end through the resonant circuit; and

a control system coupled to the resonant systems and configured to:

control, based on a target output voltage gain, switches in each first switch system and each second switch system to be turned on or turned off to enable the converter to obtain an output voltage gain equal to the target output voltage gain;

generate a drive signal for each switch in each resonant system based on the target output voltage gain; and

control, based on at least one different target output voltage gain, switches the resonant systems to be turned on or turned off to enable the converter to obtain an output voltage gain equal to the at least one different target output voltage gain.