Power supply circuit with integrated magnetic components

• US 5,335,163 A
• Filed: 05/13/1993
• Issued: 08/02/1994
• Est. Priority Date: 11/14/1990
• Status: Expired due to Term

• Current Assignee: ScanPower Co.
• Original Assignee: ScanPower Co.
• Inventors: Seiersen, Ole S.
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): Han, Y. Jessica
• Application Number:
  US08/050,499
• Time in Patent Office: 446 Days
• Field of Search: 363/44-48, 363/82, 363/90, 363/91, 363/126, 363/16-26, 323/355, 323/356, 323/357, 323/358, 323/359, 323/362, 323/363, 336/178, 336/184, 336/212
• US Class Current: 363/126
• CPC Class Codes: H01F 2003/106 Magnetic circuits using combinations of different magnetic materials
• CPC Class Codes: H01F 30/10 Single-phase transformers H01F30/16 takes precedence
• CPC Class Codes: H02M 7/068 mounted on a transformer

Abstract

A magnetic circuit with several magnetic components integrated on one or more common magnet cores is utilized in a current supply circuit known per se. The circuit comprises a transformer, the secondary winding ends of which are connected to uniform electrodes of a pair of rectifier diodes, the second electrodes of which are connected to one output terminal of the power supply circuit. Additionally, it includes two reactive components, and the first electrodes of the diodes are connected to the second output terminal of the power supply circuit via one of the reactive components. The number of turns of the two reactive components is essentially chosen to equal the number of secondary turns on the transformer. The two reactive components are positioned on each separate core part so that the resulting magnetic flux in common core parts substantially equals the difference between the magnetic flux of the two core parts, and the secondary winding of the transformer is positioned on the common core parts.

Claims

1. A magnetic circuit having several magnetic components integrated on one or more common magnet cores of a power supply circuit comprising:

a transformer, secondary winding ends of which are connected to uniform, first electrodes of a pair of rectifier diodes, second electrodes of which are connected to one output terminal of the power supply circuit, and further including two reactive components, and the first electrodes of the diodes further being connected to a second output terminal of the power supply circuit via a respective one of the reactive components, where a number of turns of the two reactive components substantially is selected so as to equal a number of secondary turns on the transformer, the two reactive components are positioned on each separate core part so that resulting magnetic flux in common core parts substantially equals a difference between magnetic flux of the core parts, and a primary winding and the secondary winding of the transformer are positioned on the common core parts.

5. A power supply circuit according to claim 1, comprising two common core parts, wherein the magnetic components are positioned on two common toroid cores, two reactive components being positioned on each separate toroid core, and a primary winding and the secondary winding of the transformer being wound through both cores.

2. A power supply circuit comprising:

a transformer having secondary winding ends which are connected to uniform, first electrodes of a pair of rectifier diodes, second electrodes of which are connected to one output terminal of the power supply circuit, and further including two reactive components, and the first electrodes of the diodes further being connected to a second output terminal of the power supply circuit via a respective one of the reactive components, wherein all magnetic components are integrated on one or more common magnet cores, where a number of turns of the two reactive components substantially equals a number of secondary turns on the transformer, and the two reactive components are positioned on each separate core part such that resulting magnetic flux in common core parts, on which a primary winding and the secondary winding of the transformer are positioned, essentially equals a difference between magnetic flux of those core parts.

3. A power supply circuit according to claim 2 comprising a common core part, wherein the magnetic components are integrated on a common E-type magnet core, the two reactive components being positioned on outer legs of the core, and the common core part being constituted by a central leg of the core.

4. A power supply circuit according to claim 3, wherein the outer legs are composed of an amorphous tape wound material, wherein the central leg is composed of a ferrite material and wherein air gaps are provided at locations where two materials adjoin.