Transformer with integrated inductor

• US 20020167385A1
• Filed: 04/18/2002
• Published: 11/14/2002
• Est. Priority Date: 04/19/2001
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Ackermann, Bernd
• Granted Patent: US 6,734,773 B2
• Time in Patent Office: Days
• US Class Current: 336/178
• CPC Class Codes: H01F 2038/026 non-linear inductive arrangements for converters, e.g. with additional windings
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings
• CPC Class Codes: H01F 3/10 Composite arrangements of magnetic circuits
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H05B 41/2822 using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations

Abstract

The present invention relates to a transformer with an additional integrated inductor. To this end it is envisaged that the transformer is provided with a first core (1) which has at least a primary winding (5), a second core (2) which has at least a secondary winding (4), and a third core (3), while each core (1, 2, 3) is a separate component.

Claims

1. A transformer provided with a first core (1) which has at least a primary winding (5), a second core (2) which has at least a secondary winding (4), and a third core (3), while each core (1, 2, 3) is a separate component.

2. A transformer as claimed in claim 1, characterized in that the first core (1) is separated from the second core (2) by at least an air gap (6) and the second core (2) is separated from the third core (3) by at least a further air gap (7).

3. A transformer as claimed in claim 2, characterized in that the air gaps (6, 7) are designed so that the first core (1) essentially carries a main flux (Φ

_h), in that the third core (3) essentially carries a stray flux (Φ

_s) and in that the second core essentially carries the difference between the main flux and the stray flux.

4. A transformer as claimed in claim 3, characterized in that the stray flux (Φ

_s) through the third core (3) has the effect of an inductor integrated with the transformer, which inductor is connected in series with the secondary winding (4).

5. A transformer as claimed in any one of claims 1 to 4, characterized in that the first core (1) has a U-shaped design.

6. A transformer as claimed in any one of claims 1 to 5, characterized in that the third core (3) has a U-shaped design.

7. A transformer as claimed in any one of claims 1 to 6, characterized in that the second core (2) has an I-shaped design.

8. A transformer as claimed in any one of claims 1 to 7, characterized in that he first core (1), the second core (2) and the third core (3) each have different sections (A₁, A₂, A₃).

9. A transformer as claimed in any one of claims 1 to 8, characterized in that the first core (1), the second core (2) and the third core (3) each have a standardized section (A₁, A₂, A₃).

10. A switched-mode power supply with a transformer provided with a first core (1) which has at least a primary winding (5), a second core (2) which has at least a secondary winding (4), and a third core (3), while each core (1, 2, 3) is a separate component.