Switched capacitors with inverted break-before-make without external filtering load capacitor

Patent metadata

Field	Value
Publication number	US-9768682-B2
Application number	US-201514821976-A
Country	US
Kind code	B2
Filing date	Aug 10, 2015
Priority date	Aug 10, 2015
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A charge pump circuit using more than one parallel source is described. A flying capacitor of the charge pump maintains a break-before-make time with respect to the switches within a side of the charge pump. A flying capacitor of the charge pump takes advantage of a make-before-break time with respect to the switches between the sides of the charge pump. This results in the shared load of the charge pump always receiving current from a flying capacitor. This slight change of control of the flying capacitor switching phases removes the need for a filtering capacitor within the charge pump.

First claim

The invention claimed is:

1. A switched-capacitor power electronic circuit, comprising:
two or more charge pump circuits connected in parallel, configured to provide an output power;
each of said charge pump circuits having a flying capacitor for providing a current to a load; and
said switched-capacitor power electronic circuit is configured to connect some of said flying capacitors to said load, in make-before break fashion, simultaneously after a charging period of one of said flying capacitors and prior to a charging period of the other said flying capacitor, wherein during a period when said one of said flying capacitors is being charged, and is disconnected from the load, the other said flying capacitor is still connected to the load.

2. The switched-capacitor power electronic circuit of claim 1 , further comprising:
a first plurality of switches of said charge pump circuits, connected to a source, configured to be open(off) to discharge a first of said flying capacitors and to be closed(on) to charge a second of said flying capacitors; and
a second plurality of switches of said charge pump circuits, connected to a load, configured to be closed(on) to discharge said first flying capacitor and to be open(off) to charge said second flying capacitor of said charge pump circuits.

3. The switched-capacitor power electronic circuit of claim 2 , wherein said second plurality of switches are operated in make-before-break fashion.

4. The switched-capacitor power electronic circuit of claim 2 , wherein said first plurality of switches are operated in break-before-make fashion.

5. The switched-capacitor power electronic circuit of claim 1 , where said load is a shared load, connected between said first charge pump circuit and said second charge pump circuit.

6. A method of operating a switched-capacitor power electronic circuit, comprising the steps of:
providing two or more charge pump circuits connected in parallel, to provide an output power;
wherein each of said charge pump circuits has a flying capacitor for providing a current to a load; and
connecting both of said flying capacitors to said load, in make-before break fashion, simultaneously after a charging period of one of said flying capacitors and prior to a charging period of the other said flying capacitor, wherein during a period when said one of said flying capacitors is being charged, and is disconnected from the load, the other said flying capacitor is still connected to the load.

7. The method, of operating a switched-capacitor power electronic circuit of claim 6 , comprising:
closing a first switch, connected to a first source and first flying capacitor, to charge said first flying capacitor;
closing a second switch, connected to a second flying capacitor and load, to discharge said second flying capacitor;
opening said first switch and said second switch, and closing a third switch, connected to said first flying capacitor and load, to discharge said first flying capacitor;
closing a fourth switch, connected to said second flying capacitor and second source, to charge said second flying capacitor; and
producing a load current by said connecting both said flying capacitors to said load simultaneously.

8. The method of claim 7 , wherein said second and third switches make-before-break when switching, with respect to each other.

9. The method of claim 7 , wherein said first and fourth switches break-before-make when switching, with respect to each other.

10. A voltage multiplier electronic circuit, comprising:
two or more charge pump circuits connected in parallel to the same voltage supply, configured to provide an output power;
each of said charge pump circuits having a flying capacitor for providing a current to a load;
said voltage multiplier electronic circuit is configured to connect each of said flying capacitors to said load, in make-before break fashion, simultaneously after a charging period of one of said flying capacitors and prior to a charging period of the other said flying capacitor, wherein during a period when said one of said flying capacitors is being charged, and is disconnected from the load, the other said flying capacitor is still connected to the load;
a first plurality of switches of said voltage multiplier electronic circuit, configured to be open(off) to disconnect the voltage supply; and
a second plurality of switches of said voltage multiplier electronic circuit, configured to be closed(on) to connect the flying capacitors in series.

11. The voltage multiplier electronic circuit of claim 10 , where said flying capacitors connected in series provide a voltage that multiplies the voltage supply.

12. The voltage multiplier electronic circuit of claim 10 , further comprising:
a third plurality of switches, connected to a source, configured to be open(off) to discharge a first of said flying capacitors and to be closed(on) to charge a second of said flying capacitors; and
a fourth plurality of switches, connected to a load, configured to be closed(on) to discharge said first flying capacitor and to be open(off) to charge said second flying capacitor of said charge pump circuits.

13. The voltage multiplier electronic circuit of claim 10 , wherein said fourth plurality of switches are operated in make-before-break fashion.

14. The voltage multiplier electronic circuit of claim 10 , wherein said third plurality of switches are operated in break-before-make fashion.

15. The voltage multiplier electronic circuit of claim 10 , where said load is a shared load, connected between said first charge pump circuit and said second charge pump circuit.

Assignees

• Dialog Semiconductor Uk Ltd

Inventors

• Banag Franck

Classifications

• H02M3/07 Primary

  using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps} · CPC title

• H02M1/0043

  Converters switched with a phase shift, i.e. interleaved (non-isolated DC/DC converters H02M3/1586) · CPC title