High efficiency switching boost converter with reduced inductor current ripple

Patent metadata

Field	Value
Publication number	US-9559589-B2
Application number	US-201514965981-A
Country	US
Kind code	B2
Filing date	Dec 11, 2015
Priority date	Jul 1, 2015
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A voltage or current regulated power converter is presented. The power converter is configured to derive electrical power at an output voltage V out at an output of the power converter from electrical power at an input voltage V in at an input of the power converter, wherein the output voltage V out is greater than or equal to the input voltage V in . The power converter comprises an inductor, a plurality of capacitors and a plurality of switches. The input and output unit are coupled via an intermediate point, wherein the output unit comprises a first output or second output arrangement, and wherein the input unit comprises a first input or a second input arrangement. The power converter comprises a controller configured to control the plurality of switches such that a commutation cycle of the power converter comprises a plurality of different operation phases.

First claim

What is claimed is:

1. A voltage or current regulated power converter, wherein
the power converter is configured to derive electrical power at an output voltage V out at an output of the power converter from electrical power at an input voltage V in at an input of the power converter;
the output voltage V out is greater than or equal to the input voltage V in ;
the power converter comprises an inductor (L), a plurality of capacitors (C 1 , C 2 , C 3 , C out ) and a plurality of switches (S 1 , S 2 , S 3 , S 4 , S 5 , S 6 , S 7 ), which are arranged within an input unit and an output unit of the power converter;
the input unit and the output unit are coupled via an intermediate point;
the output unit comprises a first output arrangement;
the input unit comprises a first input arrangement;
the power converter comprises a controller configured to control the plurality of switches such that a commutation cycle of the power converter comprises a plurality of different operation phases;
the first output arrangement comprises
a second capacitor (C 2 ) and a third capacitor (C 3 ) which are arranged in series, wherein the serial arrangement of the second and third capacitor are arranged in parallel to a positive and a negative contact of the output of the power converter;
a fifth switch (S 5 ) configured to couple the intermediate point to the positive contact of the output;
a fourth switch (S 4 ) configured to couple the intermediate point to a midpoint between the second capacitor and the third capacitor;
a seventh switch (S 7 ) configured to couple the midpoint to ground; and
a sixth switch (S 6 ) configured to couple the negative contact of the output to ground; and

the first input arrangement comprises
a first capacitor (C 1 ) and the inductor (L);
a first switch (S 1 ) configured to couple a second end of the inductor to the intermediate point; wherein a first end of the inductor is coupled to a positive contact of the input of the power converter; wherein a first end of the first capacitor is coupled to the intermediate point;
a second switch (S 2 ) configured to couple the second end of the inductor to the second end of the first capacitor; and
a third switch (S 3 ) configured to couple a second end of the first capacitor to ground; wherein a negative contact of the input of the power converter is coupled to ground.

2. The power converter of claim 1 , wherein the plurality of operation phases comprise
a first phase during which the inductor is arranged in parallel between the positive contact and the negative contact of the input; and
a second phase during which a serial arrangement of the inductor and the first capacitor is arranged in parallel between the positive contact and the negative contact of the Input.

3. The power converter of claim 1 , wherein the plurality of operation phases comprise a third phase during which one or more capacitors of the output unit are arranged in parallel to a serial arrangement of the inductor and the first capacitor.

4. The power converter of claim 3 , wherein during the second phase the first capacitor has an orientation with respect to the inductor which is reversed compared to an orientation during the third phase.

5. The power converter of claim 1 , wherein the plurality of operation phases comprise a fourth phase during which
the one or more capacitors of the output unit are arranged in series with the inductor; and
the first capacitor is decoupled from the input and the output of the power converter.

6. The power converter of claim 1 , wherein the plurality of operation phases is such that prior to an operation phase during which the inductor is coupled to the output unit, the power converter is operated in an operation phase during which the inductor is magnetized or de-magnetized, depending on the ratio of the output voltage Vout to the input voltage Vin.

7. The power converter of claim 1 , wherein the plurality of operation phases is such that prior to an operation phase during which the inductor is arranged in series to the first capacitor, the power converter is operated in an operation phase during which the inductor is magnetized or de-magnetized, depending on the ratio of the output voltage Vout to the input voltage Vin.

8. The power converter of claim 1 , wherein
the input unit comprises a plurality of first input arrangements or a plurality of second input arrangements; and
the controller is configured to operate the plurality of first and/or second input arrangements in an interleaved manner.

9. The power converter of claim 1 , wherein
the input unit comprises a plurality of first input arrangements or a plurality of second input arrangements; and
the plurality of first input arrangements and/or the plurality of second input arrangements each comprise a joint single inductor.

10. The power converter of claim 1 , wherein
the output unit comprises the second output arrangement;
the second output arrangement comprises a third capacitor and an eighth switch;
the eighth switch is configured to couple a first end of the third capacitor to the second end of the second capacitor;
a second end of the third capacitor is coupled to ground; and
the controller is configured to operate the power converter in
a phase during which the second capacitor and the third capacitor are arranged in series, and parallel to the output capacitor; and
a phase during which the second capacitor and the third capacitor are arranged in parallel to one another and each in series to a serial arrangement of the inductor and the first capacitor.

11. The power converter of claim 1 , wherein
the input unit comprises a plurality of second input arrangements;
the output unit comprises a plurality of second output arrangements;
the controller is configured to operate the plurality of second input arrangements and/or the plurality of second output arrangements in an interleaved manner.

12. The power converter of claim 1 , wherein a switch comprises a metaloxide semiconductor transistor.

13. The power converter of claim 1 , wherein the controller is configured to set the duration of each of the plurality of operation phases such that the output voltage is regulated to a pre-determined reference voltage; wherein the pre-determined reference voltage is an integer multiple of the input voltage.

14. The power converter of claim 1 , wherein the output of the power converter is coupled to a serial arrangement of a plurality of solid state lighting, referred to as SSL, devices.

15. A voltage or current regulated power converter, wherein
the power converter is configured to derive electrical power at an output voltage V out at an output of the power converter from electrical power at an input voltage V in at an input of the power converter;
the output voltage V out is greater than or equal to the input voltage V in ;
the power converter comprises an inductor (L), a plurality of capacitors (C 1 , C 2 , C 3 , C out ) and a plurality of switches (S 1 , S 2 , S 3 , S 4 , S 5 , S 6 , S 7 ), which are arranged within an input unit and an output unit of the power converter;
the input unit and the output unit are coupled via an intermediate point;
the output unit comprises a second output arrangement;
the input unit comprises a first input arrangement;
the power converter comprises a controller configured to control the plurality of switches such that a commutation cycle of the power converter comprises a plurality of different operation phases;
the second output arrangement comprises
an output capacitor (C out ) which is arranged in parallel between

Assignees

• Dialog Semiconductor Uk Ltd

Inventors

• Petersen Holger

Classifications

• H02M1/14

  Arrangements for reducing ripples from DC input or output · CPC title

• H02M3/07

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

• H02M3/158 Primary

  including plural semiconductor devices as final control devices for a single load · CPC title

• H05B33/0815

  Electricity · mapped topic

• H05B33/083

  Electricity · mapped topic