Use this resource - and many more! - in your textbook!
AcademicPub holds over eight million pieces of educational content for you to mix-and-match your way.
The new electric shielding scheme with comb-shaped wire and its applications in SMPS
By: Qingbin Chen; Wei Chen;
2011 / IEEE / 978-1-4577-1250-0
This item was taken from the IEEE Conference ' The new electric shielding scheme with comb-shaped wire and its applications in SMPS ' Common-mode conduction EMI is a key consideration in switch-mode power supplies. Copper foil electric field shielding is commonly used in the SMPS to shield the transformers or inductors in order to reduce the CM conduction interference. However, the copper foil in the magnetic components not only shield the electric field, but also affect the magnetic field distributions due to high-frequency eddy current effects, resulting in extra eddy current losses in the foil and the change of magnetic parameter of the magnetic components. This paper analyzed these behaviors with copper foil shielding and proposed the new shielding scheme which has good electric field shielding effect, but with no effect on the magnetic field. The new shielding media used comb-shaped wire array to form the shielding sheet, instead of traditional complete copper foil. With the new shielding sheet, the eddy current effect due to AC magnetic field can be avoided. The electric field shielding behaviors with the new shielding scheme was deeply analyzed with different wire densities and compared with traditional copper foil shielding. Finally, the application example of the electric shielding for LLC transformer was demonstrated.
Common-mode Conduction Emi
Switch-mode Power Supplies
Copper Foil Electric Field Shielding Scheme
Cm Conduction Interference
High-frequency Eddy Current Effects
Eddy Current Losses
Comb-shaped Wire Array
Ac Magnetic Field
Wire-mesh Shielding Sheet
Eddy Current Effect
Eddy Current Losses
Magnetic Field Distributions