Power Electronics Overview - CURENT Education & Outreach

YSP Power Electronics Overview

Prof. Daniel Costinett June 10, 2014

Voltage Levels

1V 10V 100V 10kV 1MV

The War of the Currents

AC + Simple control of

power flow + Zero-crossings + Easy to step

convert voltage + Used by motors,

generators, heaters ° Can kill an

elephant ‒ Increased losses in

transmission ‒ Requires

synchronization ‒ 3-wire transmission

DC + Low-loss

transmission + Asynchronous + Used by

electronics, batteries, PV

+ 2-wire transmission ° Can kill an

elephant ‒ Difficult to control

power flow ‒ Requires power

electronics for voltage conversion !

Introduction to Power Conversion

Example Server Power Distribution

3Φ 16kVac

3Φ 400Vac 3Φ

400Vac

380Vdc48Vdc 12Vdc

A High Efficiency Converter

US Energy Usage

Power Loss in an Ideal Switch

Buck Converter: Basic SMPS Operation

9

Loa d

Ts

Buck Converter: Basic SMPS Operation

10

Vs

Vs

D0 1

Vg !!!!

0

Low-Pass Filter

Loa d

Implementation of Power Electronics

11

!Low-Pass

Filter

!!

SPDT Switch

Interfacing AC

12

0 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016 0.018

0 2dcV

2dcV

sf1

aov

Low-Pass Filter

Loa d

Control System for Voltage Regulation

Switch ImplementationRealization of switch requires consideration of: • Magnitude and polarity

of current and voltage • Frequency of switching

actions • Operating temperature • Cost • Control circuitry

SMPS Topologies

Power Electronics Overview

Design of Power Electronics

• To meet the demands of future applications, power electronics need to be designed with multi-objective tradeoffs and multi-function operation in mind

• Two example applications in Evs: • Drivetrain DC-DC converter • Battery management system

J.W. Kolar et al, “Extreme efficiency power electronics,” IEEE CIPS 2012

Inverter Systems

Rectifier Systems

Applications of Power Electronics

Grid Applications of Power Electronics

AC SST

Wind Photovoltaic

Energy Storage

HVDC

STATCOM

$63.5B Industry 2009 with 25% AAGR last 5 years

Wind Power

Airborne Wind Turbines

Kolar, J.W.; et al. "Conceptualization and multi-objective optimization of the electric system of an Airborne Wind Turbine,"

Solar Photovoltaic

Earth Orbiting Spacecraft

Future EVs

EV Power and Drive System

Example: 2010 Prius

Power electronics (2 inverters and a boost DC-DC)

HEV drive train

ICE vs. Electric Motor

Conventional Vs. Electric VehicleTank + Internal Combustion

EngineElectric Vehicle (EV)

Battery + Inverter + AC machine

Regenerative braking

NO YES

Tank-to-wheel efficiency

≈ 20%

1.2 kWh/mile, 28 mpg

≈ 85%

0.17 kWh/mile, 200 mpg equiv.

Energy storage Gasoline energy content 12.3 kWh/kg, 36.4 kWh/gallon

LiF0.1 kWh/kg, 0.8 kWh/gallon

Refueling 5 gallons/minute 11 MW, 140 miles/minute

Level I (120Vac): 1.5 kW, <8 miles/hour Level II (240Vac): 6 kW, <32 miles/hour Level III (DC): 100 kW, <9 miles/minuteCost 12 ¢/mile [$3.50/gallon] 2 ¢/mile [$0.12/kWh]

C(tailpipe, total)

≈ ( !(0![current U.S. electricity mix]

(Prius-sized vehicle example)

A Vision: Renewable Sources + Battery Electric Vehicles

• Zero GHG emissions, no petroleum • High efficiencies are feasible: 80% grid-to-wheel • Challenges

• Battery technology: cost, cycle life, power and energy density • Efficient, reliably and cost-effective drivetrain components • Need for charging infrastructure • Limited charging power, long charge-up times

Future Applications: Hyperloop

Proposed Power Conversion Architecture

Power management in mobile electronics

µP/DSP core

Antenna

I/OAudio

Interface

A/D

D/ALO

Baseband digital Analog/RF

PA

LNA

Display

PS PS PS PS

PS

PS PS PS

Battery ChargerBattery example: single-cell Lithium-Ion Power distribution: Vbat = 2.7-4.5 V

1 V 0.5-Vbat

2.5 V 2.5 V 2.5 V

2.5 V

2.7-4.5 V

3.6 V

• Major power consumers: baseband digital, display, multiple radio channels

• Power supply demands: small footprint area & integration, high efficiency over wide range of loads, power management interface

IPhone 5 Internal Circuitry

33

RFPA, LNA

Power Mgmt IC

Power Semiconductors, Inductors

Lighting Technologies

HID Lighting Ballast

Energy Harvesting

EnergyTransducer

DC-DCAC-DC

DC-DCDC-DC

SensorLoad

Energy Storage

Power Monitoring and Control

Power Management

Goal – Enable long life, low maintenance, wireless operation and miniaturization where not possible before

Application – medical & military devices, structural & industrial monitoring, ubiquitous remote devices; Power range: 1 µW – 1 mW

Implantable Biomedical Sensor

~40 mm

~15 mm

Integrated Energy

Harvesting

Integrated Sensor

Electronics

System is powered entirely from commercial 2.4 GHz WiFi Adapter

• RF energy harvesting used as an enabling technology for long lifetime, low power, high data throughput implantable devices ! Pincident

(µW/cm2)Pin(µW)

Vin(mV)

Rem(Ω)

Pout(µW)

ηboost(%)

1.29 0.89 20.90 489 0.16 18.05

1.74 1.48 26.85 489 0.52 35.13

2.51 2.73 36.45 488 1.29 47.36

3.55 4.80 48.40 487 2.57 53.58

6.92 13.51 81.60 493 8.81 65.16

12.9 33.54 132.4 523 23.86 71.14

24.6 80.13 202.7 513 60.66 75.70

41.6 156.3 283.9 516 123.6 79.06

Pincident(µW/cm2)

Pin(µW)

Vin(mV)

Rem(Ω)

Pout(µW)

ηboost(%)

1.29 0.89 20.90 489 0.16 18.05

1.74 1.48 26.85 489 0.52 35.13

2.51 2.73 36.45 488 1.29 47.36

3.55 4.80 48.40 487 2.57 53.58

6.92 13.51 81.60 493 8.81 65.16

12.9 33.54 132.4 523 23.86 71.14

24.6 80.13 202.7 513 60.66 75.70

41.6 156.3 283.9 516 123.6 79.06

Power Electronics Applications

1µW 1 W 1 kW 1 MW

RF Energy Harvesting Laptop Power Supply

Drivetrain Power Electronics

Future EVs