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DE-102013106184-B4 - Magnetic device and power converter comprising such a magnetic device

DE102013106184B4DE 102013106184 B4DE102013106184 B4DE 102013106184B4DE-102013106184-B4

Abstract

Magnetic device comprising: a first L-core segment with a first leg and a second leg extending from it; a different, opposing second L-core segment with a first leg and a second leg extending therefrom, wherein the first leg of the first L-core segment is connected to the second leg of the second L-core segment and the second leg of the first L-core segment is connected to the first leg of the second L-core segment; a primary winding that is wound around the first leg of the second L-core segment; and a secondary winding provided with a central tap, comprising a first secondary winding and a second secondary winding formed around the first leg of the second L-core segment, wherein the first secondary winding and the second secondary winding are formed above the primary winding around the first leg of the second L-core segment.

Inventors

  • Sriram Chandrasekaran

Assignees

  • POWER SYSTEMS TECHNOLOGIES, LTD.

Dates

Publication Date
20260513
Application Date
20130613
Priority Date
20120716

Claims (7)

  1. A magnetic device comprising: a first L-core segment with a first leg and a second leg extending therefrom; a second L-core segment, distinct from the first, and opposite it, with a first leg and a second leg extending therefrom, wherein the first leg of the first L-core segment is connected to the second leg of the second L-core segment and the second leg of the first L-core segment is connected to the first leg of the second L-core segment; a primary winding wound around the first leg of the second L-core segment; and a secondary winding provided with a central tap, comprising a first secondary winding and a second secondary winding formed around the first leg of the second L-core segment, wherein the first secondary winding and the second secondary winding are formed above the primary winding around the first leg of the second L-core segment.
  2. Magnetic device according to Claim 1 , wherein the second leg of the first L-core segment is perpendicular to the first leg of the first L-core segment and the second leg of the second L-core segment is perpendicular to the first leg of the second L-core segment.
  3. Magnetic device according to Claim 1 or 2 , wherein the length of the first leg of the first L-core segment is greater than the length of the second leg of the first L-core segment and the length of the first leg of the second L-core segment is greater than the length of the second leg of the second L-core segment.
  4. Magnetic device according to one of the Claims 1 until 3 , wherein the thickness of the first leg and the second leg of the first L-core segment is equal, and the thickness of the first leg and the second leg of the second L-core segment is equal.
  5. Magnetic device according to one of the Claims 1 until 4 , wherein the first and second secondary windings are stamped and formed sheets.
  6. Magnetic device according to one of the Claims 1 until 5 , wherein the first and second secondary windings are arranged in contact with the primary winding
  7. Power converter comprising: a main switch coupled to an input of the power converter; a magnetic device according to any of the preceding claims coupled to the main switch; an auxiliary switch coupled to the magnetic device; and an output filter capacitor coupled to the auxiliary switch and an output of the power converter.

Description

Technical field The present invention relates generally to power electronics and in particular to a magnetic device and a power converter comprising such a magnetic device. background A switched-mode power supply (also known as a "power converter" or "regulated power supply") is a power supply circuit that converts an input voltage waveform into a defined output voltage waveform. Magnetic devices, such as transformers and inductors, are often used in power converters to store and/or transfer electrical energy. Because these magnetic devices typically occupy a significant amount of space on the power converter's substrate and consume a disproportionate amount of manufacturing time, it is advantageous to use a compact magnetic device that allows for flexible design. Therefore, there is a need in the field for a component for a less complex magnetic core that can be integrated into compact magnetic devices. In the US 5 283 728 A A voltage control system is described, consisting of a pair of coils nested clockwise and counterclockwise on a portion of a transformer core. The coils have multiple spaced turns forming sets of coplanar, alternating electrical contact pairs. These extend linearly to form a tap system that allows the output voltage of the transformer to be varied. From the US 2001 / 0 043 135 A1 It shows how an inductive resistance is manufactured from a conductor and a flexible, plate-shaped support element. The US 2011 / 0 148 559 A1 This describes a coil with multiple windings, comprising a first foil winding and a second foil winding. One end of the first foil winding extends from a first side of the core and is wound under the core to form a solder lug beneath the core. The US 7 675 764 B2 This document describes a power converter with input and output nodes and a method for its operation. The power converter comprises a switching circuit with a first, a second, and a third active phase line. Each of the first, second, and third active phases includes a first switch coupled to one of the input nodes and a second switch coupled to another of the input nodes, with a common switching node between them. The power converter further comprises a magnetic device with a first, a second, and a third primary winding, and a first, a second, and a third secondary winding. The first, second, and third primary windings are each coupled to the common switching node of the first, second, and third active phase lines. The power converter also includes a rectifier with a first, a second, and a third rectifier element, each arranged between the first, second, and third secondary windings and one of the output nodes. The CN 2 01 196 897 Y This describes an improved transformer comprising a magnetic core and primary and secondary windings mounted onto this core. The magnetic core consists of stacked silicon steel sheets arranged in a hollow square structure. This eliminates waste and saves material, as the sheets are made entirely of sheet metal. The structure simplifies the stamping process, reduces production costs, and is both economical and environmentally friendly. The US 2008 / 0 024 261 A1 This describes a high-voltage transformer with an optimized arrangement of the primary winding relative to the secondary winding. This results in close electromagnetic coupling and improved ease of assembly. Both windings are wound around a coil former, in the cavity of which a magnetic core is inserted. The primary winding consists of resin-coated conductive laminated coils and is arranged around the secondary winding. A positioning device enables flexible and optimal arrangement of the primary winding, thereby modulating the electromagnetic coupling. Summary of the invention Advantageous embodiments of the present invention, which include a magnetic device and a power converter comprising such a magnetic device, generally offer technical advantages. In one embodiment, the magnetic device comprises a first L-core segment with a first leg and a second leg extending therefrom, and a different, opposing second L-core segment with a first leg and a second leg extending therefrom, wherein the first leg of the first L-core segments is connected to the second leg of the second L-core segment and the second leg of the first L-core segment is connected to the first leg of the second L-core segment; a primary winding which is wound around the first leg of the second L-core segment, a secondary winding provided with a central tap, comprising a first secondary winding and a second secondary winding which are formed around the first leg of the second L-core segment, wherein the first secondary winding and the second secondary winding are formed above the primary winding around the first leg of the second L-core segment. Brief description of the drawing For a more comprehensive understanding of the present invention, reference is now made to the following description, which has been made in connection with the accompanying drawing, wherei