power converter for an electric vehicleee.bradley.edu/projects/proj2013/evpc/papers/ppt.pdf ·...
TRANSCRIPT
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Power Converters For
An Electric Vehicle
Students Jacob Anderson
Sam Emrie
Advisor Dr. Woonki Na
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Why the electric car?
Improves fuel economy
Reduces carbon emissions
HEV vs PHEV
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Electric Car Examples
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Outline
Brief Summary of Project
Functional Description
• System Block Diagram
• Performances Specifications
Battery Testing and DSP
Results
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Project Summary
PFC Circuit (Power Factor Correction)
Bidirectional Converter
Battery Testing Circuit
DSP Programming
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System Block Diagram
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Why do we need PFC?
Improves the efficiency of the system
PHEV should control PFC
Increase the amount of real power and reduce reactive power
Use switch-mode boost converter
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Power Factor Waveforms
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Designing The PFC Circuit
Re-made PFC Circuit
Modified power diode to MOSFET
Replaced Bridge Rectifier
Circuit was tested using a IR2110
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Control PFC Circuit
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Transfer Function (PFC)
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Power Factor Correction
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PFC PSIM Results
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PFC Simulink Model
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PFC Results
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Why use a gate driver?
Used as a medium between PWM output from the
DSP and input from the high power circuit DSP does not supply enough voltage
Gate driver physically switches the transistor
Has it’s own power supply to effectively output at a higher voltage
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IR2110 Gate Driver Layout
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Testing With IR2110
Previous group recommended IR2110
Used to test battery, bi-directional, and PFC
No Isolation
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Testing With IR2181
Similar problems to the IR2110
The high side would not properly output
Was hard to isolate circuit
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HCPL-3180 Gate Driver
Easier to use due to being optically isolated
Ideally suited for high frequency driving of power MOSFETS (2.5Amp)
One gate driver is used per MOSFET
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MOSFET
IRFP460A N-Type
V_DS = 500V
I_D = 20A
55ns Rise Time
High speed power switching
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Bi-directional Converter
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Designing The Bi-Directional Converter
Redesigned from previous group’s project
Replaced the power diode with a MOSFET
Circuit was tested using a HCPL-3180
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L equations and C equations
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Buck Transfer Function
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Buck Transfer Function Response
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7
7
1002.27.309
6.60601004.4
SS
S
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Buck Voltage Controller Equations
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Buck Voltage Controller Equations
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Buck Current Controller Equations
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Buck Voltage Controller Equations
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Battery Specs for Low and High Voltage
7.4V
3000 MilliWatt Hours
51.8V
10Amp-Hours
Max Discharge Rate 40A
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Battery Model
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Battery Discharging Rate
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Battery Testing Circuit
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Battery Testing Circuit
IR2110 used as gate driver
G4PC30UD IGBT used
20ohm resistor used for small scale
100ohm resistor used for large scale
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IGBT
G4PC30UD IGBT used
V_CES = 600V
V_CE(on) = 1.95V
@V_ge = 15V, I_c = 12A
Optimized for high operating frequencies
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Battery Testing Small Scale
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Small Scale Results
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Comparison of Discharging Rate
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Discharging Rate of 51.8V Battery
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Equations
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Saft Model
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Saft Model
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Charging
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Flow Chart with buck
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Output PWMCurrent PI
Controller
Voltage PI
ControllerReference
VoltageDecay Duty Cycle OutputStart
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Simulink Model
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Full Buck System
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Designing the Voltage Sensing Circuit
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Current Sensor
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DSP Board Specs
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Why use DSP?
Fast, reliable, and Ideal for controlling
Generates a pulse width modulated signal
Voltage values are calculated by DSP algorithms
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Overall System Design
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Results
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Completed Work
Battery Testing
Bi-directional and PFC Redesigned
Buck Charging model
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Future Work
PCB Designing
Discharge the battery through an inverter
to run a variable load
Build a protective structure for the battery
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References
[1] N. Mohan. First Course on Power Electronics. Minneapolis: MNPERE, 2009.
[2] Daly, et. Al. “Electric Vehicle Charger for Plug-In Hybrid Electric Vehicles.” PHEV: Plug-in Hybrid Electric Vehicle Charger. 26 Sept. 2011. Web, 24 Sept. 2012.
[3] B. Bagci. “Programming and use of TMS320F2812 DSP to control and regulate power electronic converters.” Master Thesis, Fachochschule Koln University of Applied Sciences, Cologne, Germany, 2003.
[4] G. Mathieu, “Design of an on-board charger for plug-in hybrid electrical vehicle (PHEV), “Master Thesis, Chalmers University of Technology, Goteborg, Sweden, 2009.
[5] L. Zhou, “Evaluation and DSP based implementation of PWM approaches for single-phased DC-AC converters,” Master Thesis, Florida State University, Tallahassee, Florida, United States 2005.
[6] M. Hedlund, “Design and construction of a bidirectional DCDC converter for an EV application,” Master Thesis, Uppsala University, Uppsala, Sweden, 2010.
[7] Y. Tian, “Analysis, simulation and DSP based implementation of asymmetric three-level single phase inverter in solar power system,” Master Thesis, Florida State University, Tallahassee, Florida, United States, 2007.
[8] Application Note AN-978, http://www.irf.com/technical-info/appnotes/an-978.pdf
[9] http://www.nrel.gov/vehiclesandfuels/energystorage/pdfs/evs17paper2.pdf
[10] M. Chen, “Accurate Electrical Battery Model Capable of Predicting Runtime and I-V Performance, “ IEEE Transaction, Vol. 21, No. 2, June 2006.
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Questions?