Title :
Embedded capacitance in the PCB of switchmode converters
Author :
Ferreira, J.A. ; Waffenschmidt, E. ; Strydom, J. ; van Wyk, J.D.
Author_Institution :
Electr. Power Process. Group, Delft Univ. of Technol., Netherlands
Abstract :
It is proposed that one or more capacitance layers are included in the multilayer printed circuit boards of switchmode power supplies. This technology makes it possible to integrate the filter and resonance capacitors of high frequency power electronic converters. In addition, control circuit capacitors can also be included in the PCB making it possible reduce the component count of the circuit assembly. Various capacitive layer technologies are presented that makes it possible to get capacitance of up to 10nF/cm2. The capacitance requirements of a typical switch-mode converter are investigated and two case studies are presented. In the first example a ferroelectric ceramic is used and in the second a polymer laminate.
Keywords :
capacitance; capacitors; ferroelectric ceramics; laminates; polymers; power convertors; printed circuits; switched mode power supplies; 20 V; 40 V; PCB; capacitance layers; capacitance requirements; circuit assembly; component count reduction; control circuit capacitors; embedded capacitance; ferroelectric ceramic; high frequency power electronic converters; multilayer printed circuit boards; polymer laminate; resonance capacitors; switch-mode converter; switchmode converters; switchmode power supplies; Capacitance; Capacitors; Filters; Frequency conversion; Nonhomogeneous media; Power supplies; Printed circuits; Resonance; Switching circuits; Switching converters;
Conference_Titel :
Power Electronics Specialists Conference, 2002. pesc 02. 2002 IEEE 33rd Annual
Print_ISBN :
0-7803-7262-X
DOI :
10.1109/PSEC.2002.1023856
