SLIDE 1 Image credits go here
Power electronics in electric cars
- Prof. Dr. Pavol Bauer, Delft University of Technology
SLIDE 2 Learning objectives
- What is a power electronic converter?
- Power converter types:
- AC or DC
- Power flow direction
- Isolation
- Power converters in an electric car
- Four quadrant power converter operation
SLIDE 3
Power electronic converter
io control signals Power flow Vo Vin iin
A power electronic converter is an electronic device made of high power semiconductor switches that uses different switching states to change the magnitude and waveform of the voltage and current between the input and output. INPUT OUTPUT
SLIDE 4 Power electronic switch
Image Source: https://www.vfds.com/blog/switching-it-up-igbt
SLIDE 5 Power converter: AC and DC
Direct Current (DC) Alternating Current (AC)
- 1. DC-DC converter
- 2. DC-AC converter (or) inverter
- 3. AC-DC converter (or) rectifier
- 4. AC-AC converters
SLIDE 6 Power electronic converter
- 1. Unidirectional
- 2. Bidirectional
io control signals Power flow Vo Vin iin io control signals Vo Vin iin Power flow
SLIDE 7 Power electronic converter
Rectifier Inverter
SLIDE 8
Power converter
Type AC or DC AC-DC DC-AC DC-DC AC-AC Magnetic Isolation Isolated Non-isolated Bidirectional power flow Bidirectional Unidirectional
SLIDE 9
On-board charger Motor drive Battery converter
Power converters in electric car
Auxiliary battery converter
SLIDE 10 Power converters in electric car
1 or 3 Phase AC Supply Unidirectional converter for auxiliary On-board charger, Unidirectional converter 12V/48V Auxiliary supply Battery converter, Bidirectional
SLIDE 11
Power converter
Converter AC or DC Isolation Direction On-board charger AC-DC Isolated Unidirectional Battery converter DC-DC Isolated Bidirectional Motor drive DC-AC Isolated / Non-Isolated Bidirectional Auxillary battery converter DC-DC Isolated / Non-Isolated Unidirectional
SLIDE 12
Four quadrant operation
Torque Speed Driving (Forward) Driving (Reverse) Braking (Forward) Braking (Reverse) 1 2 3 4
SLIDE 13
First quadrant operation
Torque Speed Driving (Forward)
1
2 3 4 Torque Rotation speed
SLIDE 14
Third quadrant operation
Torque Speed
3
2 1 4 Driving (Reverse) Torque Rotation speed
SLIDE 15
Third quadrant operation
Torque Speed
2
3 1 4 Braking (Forward) Torque Rotation speed
SLIDE 16
DC Motor and motor drive operation
Current magnitude à Torque magnitude Current direction à Torque direction Voltage magnitude à Rotation speed magnitude Voltage polarity à Rotation speed direction Torque Rotation speed
SLIDE 17 Four quadrant operation
Bidirectional power flow can be achieved by controlling the polarity of voltage and/or current:
Voltage Speed Current Torque Quadrant
+ + + + 1 + +
+ 4
Voltage, Speed 1 2 3 4 Current, Torque
SLIDE 18 AC and motor drive operation
- AC motors more complicated than DC motors
- Reverse rotation by changing the connection of the phases
- Torque and speed control through control of AC voltage
magnitude and frequency Torque Rotation speed
SLIDE 19 Image credits go here
Power electronics in electric cars
- Prof. Dr. Pavol Bauer, Delft university of Technology
