Solution of power consumption reduction for inverter covered by metal case

• US 8,080,864 B2
• Filed: 12/15/2008
• Issued: 12/20/2011
• Est. Priority Date: 04/25/2006
• Status: Active Grant

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Huang, Wen-Hung, Kuo, Ming-Chu, Lin, Hsien Tsung
• Primary Examiner(s): NGUYEN, CUONG QUANG
• Application Number:
  US12/334,940
• Publication Number:
  US 20090091415A1
• Time in Patent Office: 1,100 Days
• Field of Search: 257659-663, 257/E25.009
• US Class Current: 257/659
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05K 1/18 Printed circuits structurally associated with non-printed electric components H05K1/0201, H05K1/023, H05K1/0243, and H05K1/16 take precedence
• CPC Class Codes: H05K 2201/086 for inductive purposes, e.g. printed inductor with ferrite core
• CPC Class Codes: H05K 2201/1003 Non-printed inductor
• CPC Class Codes: H05K 2201/10371 Shields or metal cases
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

For improving efficiency of a power device having an exposed surface capable of radiating energy, a shielding layer is disposed in between the exposed surface and a conductive layer. The shielding layer causes at least a portion of the energy to be directed back into the power device, thereby substantially preventing the energy from inducing eddy currents in the conductive layer. The conductive layer is fabricated from a metal foil for compliance with electromagnetic energy leakage regulations.

Claims

1. A power supply system comprising:

a transformer having a plurality of windings and a physical core that are operable to convert a DC input to an alternating current (AC) output that is sufficient to power an IHS display panel, wherein the transformer includes an energy radiating outer surface that is operable to radiate energy in response to the plurality of windings and the physical core in the transformer converting the DC input to the AC output in order to power the IHS display panel;

a conductive layer that is adjacent to and spaced apart from the transformer; and

a magnetic shielding layer located between the energy radiating outer surface of the transformer and the conductive layer, wherein the magnetic shielding layer is operable to direct energy radiated from the energy radiating outer surface of the transformer back towards the transformer, and wherein the directing of the energy back towards the transformer limits that energy from inducing an eddy current in the conductive layer.

2. The power supply system of claim 1, wherein the conductive layer is fabricated from a metal foil, wherein the metal foil is an aluminum foil.

3. The power supply system of claim 1, wherein the shielding layer is fabricated from at least one of a ferrite sheet and a ferrite core.

4. The power supply system of claim 3, wherein the ferrite sheet is approximately 0.25 millimeters thick.