Application Notes on DC-DC COnverter, Topology selection Of DC DC converter High Power DC-DC converter Isolation transformer Half-bridge and Full-bridge Converter Single End Vs Double End Converter

1. Indian Institute of Technology, Bombay
Topology Selection for High Power DC-DC Converter
Aakash Lilhore
Roll No- 203079014
Course: Power Electronic-1
(EE-653)
November 4, 2020
Aakash Lilhore Topology Selection for High Power DC-DC Converter 1

2. Indian Institute of Technology, Bombay
Contents
Topology overview
High power typologies
Benefits of isolation transformer
Single ended vs double ended topology
Full bridge vs half bridge topology
Full bridge DC-DC converter
Aakash Lilhore Topology Selection for High Power DC-DC Converter 2

3. Indian Institute of Technology, Bombay
Topology Classifications
Aakash Lilhore Topology Selection for High Power DC-DC Converter 3

4. Indian Institute of Technology, Bombay
Advantage of Isolation Transformer
Provides isolation between primary and secondary.
Wide range of Voltage conversion with maintaining duty cycle at high
efficiency.
Independent ground between primary and secondary .
Multiple output with isolated ground.
Aakash Lilhore Topology Selection for High Power DC-DC Converter 4

5. Indian Institute of Technology, Bombay
Advantage of Isolation Transformer
Provides isolation between primary and secondary.
Wide range of Voltage conversion with maintaining duty cycle at high
efficiency.
Independent ground between primary and secondary .
Multiple output with isolated ground.
Aakash Lilhore Topology Selection for High Power DC-DC Converter 4

6. Indian Institute of Technology, Bombay
Advantage of Isolation Transformer
Provides isolation between primary and secondary.
Wide range of Voltage conversion with maintaining duty cycle at high
efficiency.
Independent ground between primary and secondary .
Multiple output with isolated ground.
Aakash Lilhore Topology Selection for High Power DC-DC Converter 4

7. Indian Institute of Technology, Bombay
Advantage of Isolation Transformer
Provides isolation between primary and secondary.
Wide range of Voltage conversion with maintaining duty cycle at high
efficiency.
Independent ground between primary and secondary .
Multiple output with isolated ground.
Aakash Lilhore Topology Selection for High Power DC-DC Converter 4

8. Indian Institute of Technology, Bombay
Single ended Vs Double ended topology
Single ended Topolgy
Reset circuit required
Third winding.
RCD reset.
Resonant reset.
Active clamp reset.
Double ended topology
Symmetrical operation between
first and third quadrants.
No transformer reset circuitry
required.
Aakash Lilhore Topology Selection for High Power DC-DC Converter 5

9. Indian Institute of Technology, Bombay
Half bridge Vs Full bridge
Half bridge
Advantages
MOSFET voltage stress
limited to Vs.
Half the power compared to
full bridge.
Single winding primary.
Disadvantages
Dual, totem pole primary
gate drive.
Hard switching (Non-ZVT).
Parasitics degrade circuit
performance.
Circuit complexity.
Full bridge
Advantages
High Efficiency ZVS.
Highest single stage
processing power.
MOSFET voltage stress
limited to Vs.
Twice the power compared to
half bridge.
Disadvantages
Dual, high side primary gate
drive.
Circuit complexity.
Loss of ZVS at light load
current.
Aakash Lilhore Topology Selection for High Power DC-DC Converter 6

10. Indian Institute of Technology, Bombay
Full bridge DC-DC Converter
Transfer Function
Vout
Vin
= 2 ×
Ns
Np
× D
Aakash Lilhore Topology Selection for High Power DC-DC Converter 7

11. Indian Institute of Technology, Bombay
High Power Topologies Comparison
Topology Transformer VDS ”Ideal” Application
CCM Boost Inductor VOUT High power PFC > 300 W
(non-isolated) Interleaved PFC > Several kW
BCM Boost Inductor VOUT PFC < 300 W
(non-isolated) Interleaved PFC < 1 kW
Forward Single-end 2 ×VIN < 200 W
universal off-line or telecom
Active Clamp Single-end VIN × 1
1−D < 500 W universal off-line
or telecom, highest efficiency required
2-Switch Forward Single-end VIN < 500 W, universal off-line,
PFC pre-regulator
Half Bridge Double-end VIN < 500 W, EU off-line
Intermediate Bus Converters
Push Pull Double-end 2×VIN < 500 W, telecom or
low VIN(< 200V )
Full Bridge Double-end VIN > 500 W, universal off-line
Aakash Lilhore Topology Selection for High Power DC-DC Converter 8

12. Indian Institute of Technology, Bombay
Reference
Power Electronics: Converter, Applications Design, 3rd Edition,
Mohan, Undeland and Riobbins, Wiley
Power Electronics, M.H. Rashid, Prentice Hall of India, 1994.
Fundamental of Power Electronics, 2nd Edition, Erickson and
Maksimovic, Springer
Power Electronics, Daniel W Hart, McGraw-Hill
10 PSMA PTR 2014-10-02 Power Converter Topology Trends
Mappus Fairchild
Aakash Lilhore Topology Selection for High Power DC-DC Converter 9