Power Electronics
No.1: Preparation			
Prof. Takeshi Furuhashi	Furuhashi_at_cse.nagoya-u.ac.jp

1What is Power Electronics?	
Electric Energy	
DC or AC 	Power Conversion
Equipment	Electric Energy		
DC or AC	Power electronics circuits convert electric power from one
form to another using electronic devices. They function byusing semiconductor devices by switches, thereby controllingor modifying the voltage or current.	
2

Where are they used?	

Frequency
Converter	AC 60Hz	DC	

http://ja.wikipedia.org/wiki/佐久間周波数変換所	
http://www.toshiba-smartcommunity.com/jp/smart-grid/hvdc	

http://ja.wikipedia.org/wiki/電力系統	

AC 50Hz	3

Where are they used?	

Bullet train (DC to AC)	Linear motor car(DC to AC)	Wind power generation(AC to AC)	Solar power generation(DC to AC)	http://ja.wikipedia.org/wiki/風力発電-竜飛ウィンドファーム1.jpg	 	

http://ja.wikipedia.org/wiki/のぞみ_（列車）	

http://www.linimo.jp/sonota/syaryo/syaryo_050125_04(l)_photo.html	

http://ja.wikipedia.org/wiki/太陽光発電	

Homeappliances https://(AC to AC)	 www.mitsubishielectric.

http://www.toshiba.co.jp/
living/air_conditioners/	

co.jp/home/fan/	

http://panasonic.jp/soji/	

Hybrid car (DC to AC)	http://ja.wikipedia.org/wiki/ファイル:
TOYOTA_Prius.jpg	

Fuel cell car (DC to AC)	http://ja.wikipedia.org/wiki/ファイル:FCX_Clarity.jpg	

http://ja.wikipedia.org/wiki/ロボット	

Robot(DC to AC)	4

http://ja.wikipedia.org/wiki/ファイル:Honda ASIMO(ver. 2011) 2013 Tokyo Motor Show.jpg	

Where are they used?	

Audio amplifier (AC to AC)	http://www.jp.onkyo.com/audiovisual/purecomponents/amplifier/a7vl/img//a7vl_1l.jpg	

Mobile music player (AC to AC)	http://upload.wikimedia.org/wikipedia/commons/archive/1/11/
20090323073303%21IPod_family.png	

D-classamp.	

Television (AC to AC)	http://www.sharp.co.jp/aquos/lineup/index-series.html	

Battery lives of mobile phones	
http://www.cqpub.co.jp/dwm/contents/0068/dwm006801360.pdf	

5Regenerative energy		Solar energy 	
Sunlight 	
Solar heat 	Wind energy
Geothermal energy 	
Hydro-energy 	
Ocean energy	Temperature difference	Tidal energy	
Wave energy	
Salinity difference 	Biomass energy 		Hydrogen energy 	
Fuel cell
Cogeneration

Electric power	

Power electronics equipment	
Different form of electric power	
6Power Electronics	
The key technology for• Energy conservation• Regeneration
7

Lecture Program	
1. Preparation
2. Rectifier circuit
3. Smoothing circuit
4. Step-down chopper	
5. Step-down chopper with smoothing circuit	
6. Step-up/down chopper
7. Operational amplifier	
8. DC motor
9. Motor drive using chopper circuit
10. PI controller
11. Braking circuit
12. Half bridge inverter
13. Full bridge inverter	
14. Three-phase PWM inverter
15. Three-phase PWM inverter II	8

Construction Practice	 STEP1 Rectifier	

D1C1

P1A P1B

D４	

D2

D3

R4510

vo

LED3

0.1µF
PIC12F615
PIC16F615
PIC12F615

6V

A2 A1 A0CS

v10.1µF

VR12kΩ

（A1 A0 = 00）	9

Circuit Construction Practice	 STEP1 Rectifier	

10Construction Practice STEP7 Speed control of DC motor using a step-down chopper	

11Construction Practice STEP10 Audio amplifier using a full bridge inverter	12Parts shop	

Osu-kannon st.	

Yaba-cho st.	

アメ横第２ビル
Ameyoko 2nd building	No.1 exit	

No. 8 exit	

Kamimaezu st.	
Web shops		
http://akizukidenshi.com/
http://www.marutsu.co.jp/user/index.php
http://www.rswww.co.jp/

13Parts list
parts, ratings
DC motor
LEDEar phone plugOpe-amp
Variable Resistor

Capacitor

RE-280RA
RedLM358N
2 kΩ1 00 kΩ
0.001 µF
0.0047 µF
0.01 µF
0.047 µF
0.1 µF0.47 µF
1 µF
4.7 µF

Jumper wire
Diode30 V, 1 ASpeaker
SwitchReactor

Resistor

toggle typepush type
1.5 mH
50 Ω
100 Ω
510 Ω
1 kΩ
2.2 kΩ
5 kΩ
10 kΩ
20 kΩ
50 kΩ
100 kΩ
20 0 kΩquantity unit	 c ost
2200
75
160
120
140
140
110
110
110
110
110
110210110
1150
420
1150
150
130
120
20.5
20.5
70.5
20.5
20.5
20.5
20.5
20.5
20.520.520.5

sum
400
356020404010101010101020
1015080150
5030201
13.5
11111111parts, ratings
10 µF
Electrolytic capacitor 47 µF
470 µF（AA×2）
Battery box（AA×4）
2SA950Transisor
2SC2120
Bread Board
Slotted screwdriver
Micro computer
PIC12F615-I/P

quantity
1
1
12
1221
11unit	 c ost
30
30
30
60
100
1010300
4065

sumAA battery
Parts box
Carrying case
bag8
1
1125
100
100
20200
10010020Total	 sum2353.5303030
1201002020300
4065

14

DC motor	 DC motor symbol	 

Anode	 

Anode	 Longer leg	 Cathode	 

LED symbol	 Cathode	 LED (Light Emitting Diode)15（decomposed）	 	 
Earphone plug	 +Vcc

⑤Appearance	 －+LM358N①⑤－+Vcc⑧⑧④－Vcc

Solid figure	 ①④Pin Connections	 
16

Operational Amplifier (LM358N)-Vcc

Upperasurface	c202= 20×102 Ω= 2 kΩabcccbb

The front	
a bc

a

Under
surface	
Variable resistor (2kΩ)

Pin connections	 

105= 10×105 pF= 1000000 pF= 1 [µF]

Capacitor473= 47×103 pF= 47000 pF= 0.047 µFba

Variable resistor symbol	 

Capacitor symbol	 

17

5 each	 Approx. 50	 
20	 Jumper Wires	 Cathode	The stripe indicates cathode.	 

Cathode	Anode	

Diode symbol	 
Diode (30V, 1A)

18

front	back	Speaker symbol	 

Speaker	 Pins in this figure coincidewith those in the photo.	 

①① ②	 	 	 ③	 Toggle switch	 ③	 ②Toggle switch symbol	 

19

123

1	 3

2	 4

4

Push switch symbol
and pin connections	 

Push switch	 

Reactor symbol	 
Reactor (1.5 mH)

20

5 1 1 gold	 = 51 ×101 ± 5%
= 510Ω ± 5%

Resistor (510Ω)Resistor symbol	 

Color code	 Black: 0
Brown: 1
Red:2Orange: 3
Yellow: 4
Green: 5
Blue:6
Purple: 7
Grey:8White: 9

Gold:±5%Silver: ±10%No color: ±20%

Longer leg＋electrode	+Electrolytic capacitor（47µF,)

Electrolytic capacitor
symbol	 21

AA×4	
AA×２	Power switch	

red	＋	black	－	DC power supply
symbol	 Battery box	 

22Collector (C)Base (B)
E

C

B

E

CCollector (C)Base (B)

B
Emitter (E)Transistor	 
(left：2SC2120(NPN-type)right：2SA950(PNP-type))

NPN-type transistor (2SC2120)

Emitter (E)

PNP-type transistor (2SA950)

23

Holes connected by a blackline are electricallyconnected.	 
Connection inside theboard	 

Bread board	 151－	+510ABC DEABC DE

1060－	+hole	 

F GH I J

F GH I J60+－	－	+Hole connections	 

24

GND
⑧GND ⑧⑤⑤12F615

12F615①+V

Micro computer PIC12F615④Solid figure	 

+V ①

④

Connection of power lines	 

Slotted screwdriver	 
25

How to solder	 ① select jumper wires withlengths of 100mm	 

②solder as shown inthe video	 ③do not stain desk	 

④be careful not toburn yourself．	 
26

DC motor	 Speaker	 

27

Earphone plug	 
There are three terminals.
Two are short and one is long.	 

You can select either of thetwo shorter terminals 	 

Select a wire with a bright color to be soldered to a shorter terminal.	 

Select a wire with a dark color to be soldered to the longer terminal.	 

Completed	 28

Lesson in soldering	 

①

③

②

First, Put a solder on a terminal first.	 

Then, put solder on wire.	 

Finally, solder the wire on theterminal.	 

29One point lesson for battery box	 

Do not forget to switch
the box off when you are
not using the battery.	 
The wires might happen
to touch each other while
you are carrying the box
on the way to/from home.	 	 
→Batteries will become
too hot to touch. You cansustain a burn injury if you
touch them.	 
→Battery box will melt.	 
→Batteries will shut off.	 

These terminals might touch each other.	

30