поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

Preview PDF HTML

AN3372 датащи(PDF) 16 Page - STMicroelectronics

номер детали AN3372
подробное описание детали  This note describes digital ballast for 70 W HID lamps
PDF  37 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3372 датащи(HTML) 16 Page - STMicroelectronics

Back Button AN3372 Datasheet HTML 12Page - STMicroelectronics AN3372 Datasheet HTML 13Page - STMicroelectronics AN3372 Datasheet HTML 14Page - STMicroelectronics AN3372 Datasheet HTML 15Page - STMicroelectronics AN3372 Datasheet HTML 16Page - STMicroelectronics AN3372 Datasheet HTML 17Page - STMicroelectronics AN3372 Datasheet HTML 18Page - STMicroelectronics AN3372 Datasheet HTML 19Page - STMicroelectronics AN3372 Datasheet HTML 20Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 16 / 37 page
background image
PFC design rules
AN3372
16/37
Doc ID 018625 Rev 1
6
PFC design rules
The front-end stage of conventional offline converters, typically consisting of a full-wave
rectifier bridge with a capacitor filter, has an unregulated DC bus from the AC mains. The
filter capacitor must be large enough to have a relatively low ripple superimposed on the DC
level. The current from the mains is a series of narrow pulses with very high amplitude. A
consequence of this condition is the distortion of the AC line voltage and a poor utilization of
the power system's energy capability. This can be measured considering two parameters:
1.
the total harmonic distortion (THD)
2.
the power factor (PF)
Two methods of controlling a PFC preregulator are currently widely used:
1.
the fixed frequency average current mode PWM (FF PWM)
2.
the transition mode (TM) PWM (fixed ON-time, variable frequency)
In this application the PFC section is realized with a boost converter working in transition
mode and digitally controlled. Design criteria of the PFC stage power components are
explained.
6.1
Specifications
●
Minimum mains voltage (RMS value): Vacmin = 85 V
●
Maximum mains voltage (RMS value): Vacmin = 265 V
●
Minimum main frequency: fmin = 47 Hz
●
Expected bridge efficiency:
ηbridge = 95%
●
Rated lamp power: Plamp = 70 W
●
Rated out power:
●
Output current:
●
Regulated DC output voltage (DC value): Vout = 410 V
●
Maximum output low-frequency Vout ripple: Voutx = 20 V
●
PFC minimum switching frequency: fmin = 30 kHz
●
Expected PFC efficiency:
ηPFC 96%
●
Expected Input section efficiency:
ηin 99%
●
Expected power factor: 0.99.
6.2
Operating conditions
●
Expected input power:
●
Maximum RMS input current:
Pout
P
lamp
η
bridge
----------------
73.6W
=
=
A
18
.
0
V
P
I
out
out
out
=
=
W
5
.
77
99
.
0
96
.
0
95
.
0
150
P
P
in
PFC
Bridge
lamp
in
=
⋅
⋅
=
η
⋅
η
⋅
η
=
A
92
.
0
99
.
0
85
5
.
77
PF
V
P
I
min
ac
in
in
=
⋅
=
⋅
=



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37


датащи скачать

Go To PDF Page


ссылки URL



Вашему бизинису помогли Аллдатащит?  [ DONATE ] 

Что такое Аллдатащит   |   реклама   |   контакт   |   Конфиденциальность   |   Ссылка на техническое описание    |   обмен ссыками   |   поиск по производителю
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com