paper id # 143 a design methodology for class-d resonant...
TRANSCRIPT
u : A New Design Parameter That Yields 2-D Design Curves
• The solution spaces, when plotted against u, can be compressed into 2-D design curves.
• The design curves allow quick selection of circuit parameters.
Experimental Results
Rinn
Xinn
Rin
u
Xin
Analytical solutionsfor input impedance
Rearranged in terms of u 2-D solution curves
|Zin|n
∠Zinn
|Zin|n |Zin|n
∠Zinn ∠Zinn
Final Design curves
Rinn
Xinn
Measured Vin and IinRectifier implementation
Model vs. Implemented rectifier comparison
Experimental data confirming proposed design curves
∠Zinn|Zin|n
Design Example: 500V, 50mA, 25MHz rectifier with resistive Rin =50Ω
Parameter Definitions
A Design Methodology forClass-D Resonant Rectifier with Parallel LC Tank
Sanghyeon Park and Juan Rivas-DavilaStanford University Power Electronics Research (SUPER) Lab
Problem Statement
Schematic of the class-D rectifier
• Class-D resonant rectifier is
suitable for high-voltage high-
frequency ac-to-dc conversion.
• It lacks systematic design
approach.
• Nonlinear diode junction
capacitance makes it difficult to
apply analytical solution.
• Designers have been relying on
time-consuming parametric
sweep.• From design curves, look up Xin and u that correspond
to Rin of 50 Ω
Xin = -262 Ω, u = 1.079
• Calculate effective capacitance C
• Do the math :
Average capacitance
when voltage swings
from 0 to Vo
v
c(v)
Vo
PAPER ID # 143
AcknowledgmentThe authors thank the Energy/Power Management Systems
focus area of the SystemX Alliance for funding this work.
Normalized input resistance
Normalized input reactance
A new design parameter
Three simple design steps to follow
Objectives• To develop a design method
applicable to class-D
rectifiers with nonlinear
capacitanceProject Output
Desired specs description Rectifier designed
20ms later
• Python script developed in this project finishes
rectifier design in a fraction of a second