Inductive structures with reduced emissions and interference

Patent metadata

Field	Value
Publication number	US-9337905-B2
Application number	US-201314026515-A
Country	US
Kind code	B2
Filing date	Sep 13, 2013
Priority date	Jul 1, 2013
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

An inductive structure includes a power coil and a data coil. The data coil is substantially centered within the power coil. A first portion of the data coil conducts current in a first direction. A second portion of the data coil conducts current in a second direction opposite the first direction. The first portion of the data coil is connected at a node to the second portion of the data coil. The node is coupled to a ground.

First claim

What is claimed is:

1. A device, comprising:
a first inductive structure including a first power coil and a first data coil, wherein: the first data coil is substantially centered within the first power coil; a first portion of the first data coil is for conducting current in a first direction; a second portion of the first data coil is for conducting current in a second direction opposite the first direction; the first portion of the first data coil is connected at a first node to the second portion of the first data coil; and the first node is coupled to a first ground; and
a second inductive structure including a second power coil and a second data coil, wherein: the second data coil is substantially centered within the second power coil; a first portion of the second data coil is aligned with the first portion of the first data coil for conducting current in the first direction; a second portion of the second data coil is aligned with the second portion of the first data coil for conducting current in the second direction; the first portion of the second data coil is connected at a second node to the second portion of the second data coil; and the second node is coupled to a second ground isolated from the first ground;
wherein the first power coil is for: receiving power without data from a transmitter; and outputting the power without data by inductive coupling to the second power coil; and
wherein the second power coil is for: receiving power without data by inductive coupling from the first power coil; and outputting the power without data to a receiver.

2. The device of claim 1 , and comprising:
an isolation barrier between the first and second inductive structures.

3. The device of claim 1 , wherein the first data coil is for: receiving data from a transmitter; and outputting the data by inductive coupling to the second data coil.

4. The device of claim 1 , wherein the second data coil is for: receiving data by inductive coupling from the first data coil; and outputting the data to a receiver.

5. The device of claim 1 , wherein the first and second inductive structures are substantially identical to one another.

6. The device of claim 5 , wherein the first and second portions the first data coil are substantially identical to one another, yet reversed from one another.

7. A method, comprising:
conducting current in a first direction through a first portion of a first data coil of a first inductive structure, wherein the first inductive structure includes a first power coil within which the first data coil is substantially centered;
with the first power coil, receiving power without data from a transmitter, and outputting the power without data by inductive coupling to the second power coil;
conducting current in a second direction through a second portion of the first data coil, wherein: the second direction is opposite the first direction; the first portion of the first data coil is connected at a first node to the second portion of the first data coil; and the first node is coupled to a first ground;
conducting current in the first direction through a first portion of a second data coil of a second inductive structure, wherein: the second inductive structure includes a second power coil within which the second data coil is substantially centered; and the first portion of the second data coil is aligned with the first portion of the first data coil;
with the second power coil, receiving power without data by inductive coupling from the first power coil, and outputting the power without data to a receiver; and
conducting current in the second direction through a second portion of the second data coil, wherein: the second portion of the second data coil is aligned with the second portion of the first data coil; the first portion of the second data coil is connected at a second node to the second portion of the second data coil; and the second node is coupled to a second ground isolated from the first ground.

8. The method of claim 7 , and comprising:
inductive coupling the first inductive structure to the second inductive structure, across an isolation barrier between the first and second inductive structures.

9. The method of claim 7 , and comprising:
with the first data coil, receiving data from a transmitter; and outputting the data by inductive coupling to the second data coil.

10. The method of claim 7 , and comprising:
with the second data coil, receiving data by inductive coupling from the first data coil; and
outputting the data to a receiver.

11. The method of claim 7 , wherein the first and second inductive structures are substantially identical to one another.

12. The method of claim 11 , wherein the first and second portions the first data coil are substantially identical to one another, yet reversed from one another.

13. A device, comprising:
a first inductive structure including a first power coil and a first data coil, wherein the first data coil has a symmetric 8-shape substantially centered within the first power coil;
a second inductive structure including a second power coil and a second data coil, wherein the second data coil has the symmetric 8-shape substantially centered within the second power coil, and wherein the first and second data coils are aligned with one another;
an isolation barrier between the first and second inductive structures;
wherein the first power coil is for: receiving power without data from a transmitter; and outputting the power without data by inductive coupling across the isolation barrier to the second power coil;
wherein the second power coil is for: receiving the power without data by inductive coupling across the isolation barrier from the first power coil; and outputting the power without data to a receiver;
wherein the first data coil is for: receiving data from the transmitter; and outputting the data by inductive coupling across the isolation barrier to the second data coil; and
wherein the second data coil is for: receiving the data by inductive coupling across the isolation barrier from the first data coil; and outputting the data to the receiver.

14. The device of claim 13 , wherein the first and second inductive structures are substantially identical to one another.

15. The device of claim 13 , wherein a center of the symmetric 8-shape of the first data coil is coupled to a first ground; and a center of the symmetric 8-shape of the second data coil is coupled to a second ground isolated from the first ground.

Assignees

• Texas Instruments Inc

Inventors

• Lisi Gianpaolo
• Socci Gerard
• Djabbari Ali
• Subramoniam Rajaram

Classifications

• H04B5/79 Primary

  for data transfer in combination with power transfer · CPC title

• H04B5/263 Primary

  Multiple coils at either side · CPC title

• H04B5/0037

  Electricity · mapped topic

• H04B5/0087 Primary

  Electricity · mapped topic

• H04B5/0031

  Electricity · mapped topic