Signal transfer device

Patent metadata

Field	Value
Publication number	US-9899146-B2
Application number	US-201514942764-A
Country	US
Kind code	B2
Filing date	Nov 16, 2015
Priority date	Dec 1, 2014
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

In order to transfer a signal for driving a high-side semiconductor power switch, a signal transfer device includes a transmitting circuit, a receiving circuit, and an insulating transformer provided between the transmitting circuit and the receiving circuit. In the insulating transformer, a secondary side of a set transformer part and a secondary side of a reset transformer part are magnetically coupled. The magnetic coupling direction is formed so that a secondary-side terminal of the transformer part and a secondary-side terminal of the transformer part can have polarities reverse to each other. Thus, it is possible to provide a signal transfer device for transferring a signal through an insulating transformer, in which occurrence of common-mode noise can be suppressed and a countermeasure circuit against the noise can be simplified.

First claim

What is claimed is:

1. A signal transfer device which transfers a signal through a transformer to a receiving circuit, the signal transfer device comprising:
a receiving circuit having a set-side input terminal and a reset-side input terminal; and
a transformer having a first transformer part including a secondary-side winding connected to the set-side input terminal of the receiving circuit and having a second transformer part including a secondary-side winding connected to the reset-side input terminal of the receiving circuit,
wherein the first transformer part and the second transformer part are magnetically coupled to each other so densely that a magnetic flux interlinking with one secondary-side winding interlinks with the other secondary-side winding; and the respective secondary-side windings are connected to the receiving circuit so that the set-side input terminal and the reset-side input terminal of the receiving circuit have magnetic polarities that are reverse to each other,
wherein the secondary-side windings of the first transformer part and the second transformer part have respective signal terminals and ground terminals, and
wherein the respective secondary-side windings of the first transformer part and the second transformer part are wound in a direction that is the same direction but the respective signal terminals and the respective ground terminals are reversed to each other so that the set-side input terminal and the reset-side input terminal of the receiving circuit have magnetic polarities that are reverse to each other.

2. The signal transfer device according to claim 1 , wherein the transformer is made up of spiral coils that are rectangular spiral coils, circular spiral coils, elliptical spiral coils, or polygonal spiral coils.

3. The signal transfer device according to claim 1 , wherein the transformer is made up of solenoid coils that are rectangular solenoid coils, circular solenoid coils, elliptical solenoid coils, or polygonal solenoid coils.

4. The signal transfer device according to claim 3 , wherein the solenoid coils are laminated.

5. The signal transfer device according to claim 1 , wherein the transformer includes a primary-side winding formed out of a single coil or a plurality of coils that are connected in series or in parallel.

6. The signal transfer device according to claim 5 , wherein the transformer is made up of spiral coils that are rectangular spiral coils, circular spiral coils, elliptical spiral coils, or polygonal spiral coils.

7. The signal transfer device according to claim 5 , wherein the transformer is made up of solenoid coils that are rectangular solenoid coils, circular solenoid coils, elliptical solenoid coils, or polygonal solenoid coils.

8. The signal transfer device according to claim 7 , wherein the solenoid coils are laminated.

9. The signal transfer device according to claim 1 , wherein the secondary-side windings of the first transformer part and the second transformer part have respective ends for which one respective end of each secondary-side winding is connected to the other to provide a connection point, and have respective another ends for which one respective another end is connected to the set-side input terminal and the other respective another end is connected to the reset-side input terminal of the receiving circuit, and wherein the transformer further comprises an intermediate tap provided at the connection point.

10. A signal transfer device which transfers a signal through a transformer to a receiving circuit, the signal transfer device comprising:
a receiving circuit having a set-side input terminal and a reset-side input terminal; and
a transformer having a first transformer part including a secondary-side winding connected to the set-side input terminal of the receiving circuit and having a second transformer part including a secondary-side winding connected to the reset-side input terminal of the receiving circuit,
wherein the first transformer part and the second transformer part are magnetically coupled to each other so densely that a magnetic flux interlinking with one secondary-side winding interlinks with the other secondary-side winding; and the respective secondary-side windings are connected to the receiving circuit so that the set-side input terminal and the reset-side input terminal of the receiving circuit have magnetic polarities that are reverse to each other, and
wherein the secondary-side winding of the first transformer part and the secondary-side winding of the second transformer part are wound in reverse directions so that the set-side input terminal and the reset-side input terminal of the receiving circuit have magnetic polarities reverse to each other.

11. The signal transfer device according to claim 10 , wherein the transformer is made up spiral coils that are rectangular spiral coils, circular spiral coils, elliptical spiral coils, or polygonal spiral coils.

12. The signal transfer device according to claim 10 , wherein the transformer is made up of solenoid coils that are rectangular solenoid coils, circular solenoid coils, elliptical solenoid coils, or polygonal solenoid coils.

13. The signal transfer device according to claim 12 , wherein the solenoid coils are laminated.

14. The signal transfer device according to claim 10 , wherein the transformer includes a primary-side winding, and wherein the primary-side winding is formed out of a single coil or a plurality of coils that are connected in series or in parallel.

15. The signal transfer device according to claim 14 , wherein the transformer is made up of spiral coils that are rectangular spiral coils, circular spiral coils, elliptical spiral coils, or polygonal spiral coils.

16. The signal transfer device according to claim 14 , wherein the transformer is made up of solenoid coils that are rectangular solenoid coils, circular solenoid coils, elliptical solenoid coils, or polygonal solenoid coils.

17. The signal transfer device according to claim 16 , wherein the solenoid coils are laminated.

18. The signal transfer device according to claim 1 , wherein the transformer includes a primary-side winding having end terminals, wherein the primary-side winding is formed out of one coil, and wherein a signal transmitted to the set-side input terminal of the receiving circuit and a signal transmitted to the reset-side input terminal of the receiving circuit are inputted to opposite end terminals of the primary-side winding.

19. The signal transfer device according to claim 18 , wherein the secondary-side windings of the first transformer part and the second transformer part have respective ends for which one respective end of each secondary-side winding is connected to the other to provide a connection point, and have respective another ends for which one respective another end is connected to the set-side input terminal and the other respective another end is connected to the reset-side input terminal of the receiving circuit, and wherein the transformer further comprises an intermediate tap provided at the connection point.

20. A signal transfer device which transfers a signal through a transformer to a receiving circuit, the signal transfer device comprising:
a receiving circuit having a set-side input terminal and a reset-side input terminal that have respective magnetic polarities that are reverse to each other; and
a transformer having a first transformer part and a second transformer part that are magnetically coupled to each other, the first transformer part i

Assignees

• Fuji Electric Co Ltd

Inventors

• Sugahara Satoshi

Classifications

• H01F27/29

  Terminals; Tapping arrangements {for signal inductances} · CPC title

• H01F2027/2809

  on stacked layers · CPC title

• H01F38/14 Primary

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H01F2038/143

  for signals · CPC title

• H01F27/28

  Coils; Windings; Conductive connections · CPC title