Polyphase inductive filter

Patent metadata

Field	Value
Publication number	US-11448678-B2
Application number	US-202016732991-A
Country	US
Kind code	B2
Filing date	Jan 2, 2020
Priority date	Jan 4, 2019
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

A device including at least two transformers, wherein: each winding of a transformer is electrically in series with a winding of another transformer, and the transformers have a transformation ratio different from one.

First claim

What is claimed is:

1. A device comprising at least two transformers and at least two electric paths, wherein:
each electric path comprises at least two windings electrically connected in series;
each winding of one of the at least two transformers is electrically connected in series with a winding of another one of the at least two transformers;
an input terminal of a first winding of each electric path is connected to an input terminal of said path;
an output terminal of a last winding of each electric path is connected to an output terminal of said path; and
the transformers have a transformation ratio different from one,
wherein the input terminal of each electric path is coupled to the output terminal of said electric path via windings exclusively.

2. The device of claim 1 , wherein at least two windings of a same transformer have different numbers of spirals.

3. The device of claim 1 , wherein the coupling coefficient of each transformer is greater than 0.9.

4. The device of claim 1 , wherein phase points of the windings are magnetically opposite.

5. The device of claim 1 , comprising at least two paths, each of which comprises at least two windings in series of different transformers.

6. The device of claim 5 , wherein phase points of at least two windings of a same path are magnetically opposite.

7. The device of claim 5 , wherein the number of transformers is equal to the number of paths.

8. The device of claim 5 , wherein the number of windings in series per path is equal to the number of windings per transformer.

9. The device of claim 5 , wherein each path represents a phase of an AC voltage.

10. The device of claim 1 , wherein each transformer comprises a toroidal magnetic circuit.

11. The device of claim 1 , comprising a PCB-type substrate having magnetic circuits of the transformers included therein.

12. The device of claim 11 , wherein said windings are each defined by conductive tracks located on the opposite surfaces of the substrate and series-coupled by vias.

13. A polyphase inductive filter comprising the device of claim 1 .

14. A switched-mode converter comprising at least one device of claim 1 .

Assignees

• Commissariat Energie Atomique

Inventors

• Lefevre Guillaume

Classifications

• H01F17/0006 Primary

  Printed inductances (printed coils for dynamo-electric machines H02K3/26; printed circuits H05K) · CPC title

• H02M3/33576

  having at least one active switching element at the secondary side of an isolation transformer · CPC title

• H02M3/003

  Constructional details, e.g. physical layout, assembly, wiring or busbar connections · CPC title

• G01R35/02

  of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating · CPC title

• H01F27/2804

  Printed windings · CPC title