TITLE: DC-DC CONVERTER
(BUCK)
ABSTRACT:
To design a DC-DC converter
circuit to modify 100V dc supply to 10V dc.
This can be obtained best by using a Buck converter circuit; this is
because it has a very low power dissipation, and high efficiency.
TASK
1.
Design the
circuit using “ Multisim software” to check if you can get the required output.
2.
Draw a
circuit diagram of the copper circuit based on HCPL3021 (IC), an IGBT/MOSFET, and
one diode: included all other components you require.
3.
Choose
appropriate devices and components .
4.
Prepare an
order sheet to purchase the components, assume you will be building 20
converters and that cost is a factor. Detail of order number, price, and
supplier are essential .
5.
Draw the
layout of the chopper circuit. With components (PCB design).
6.
Write a
report explaining your design, costing and PCB design for 20 pieces.
PROCEDURES
1.
CALCULATIONS
I choose my frequency to be 65kHz, ripple 0.5%, load resistor RL = 150-Ω. And given, voltage input
is 100-V, and expected voltage output is 10-V.
I am using a Buck converter.
Duty Cycle, D= vo/vi=10/100=0.1
Lmin=(1-D)/2f.R=((1-0.1))/(2*65k).150=1.0385m
L=10*Lmin=10.39mH
C=(1-D)/8rL =f^2=(1-0.1)/(8*0.005*0.01039*(65000)^2 )=512.8pf
Checking my calculations
r=(1-D)/8CLf^2=(1-0.1)/[8*0.0000005128*0.01039*(65000)^2 ]=0.005=0.5%
which is correct.
2.
MULTISM
DESIGN
The circuit
Oscillator output.
As we can see, the output at CH03 is not
stable, so in order to stabilize it we need a voltage regulator. Please check
my next blog.
3.
PRINTED
CIRCIUT BOARD (PCB) DESIGN
4.
Order
sheet (In Malaysian Currency)
Description
|
Unit
price (RM)
|
ZVN3306F
MOSFET
|
1.20
|
1N4007GP
DIODE
|
0.20
|
INDUCTOR
10 mH
|
0.30
|
RESISTOR
150 ohm
|
0.20
|
CAPACITOR
512.8 pF
|
1.50
|
VERO
BOARD(small)
|
1.50
|
BOX
XU484
|
2.50
|
WIRE
1M
|
6
|
TOTAL
|
13.4
|
For
the 20 pieces will be 13.4x20 =268 RM
5.
CONCLUSION
DC-DC
converter is more efficient and effective when converting a DC voltage to a DC
voltage, whether reduction or increment. It is simple to design and have few
components to assemble and very low power loss.
[Please do comment, :D]
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