Page 119 - Power Quality in Electrical Systems

102 Chapter Seven

i s

υ s L
+
C R L V O
–

(a)

AC 90 V to 268 V

100 k
1.0 m
1.4 V 28 V 8
3 k
Zero current
Detector 5.3 V 5
1.6 V/1.4 V +
2.5 V
POR
reference
UVL 100 m
0 400 V/0.44 A
Timer
16 V
7
TSD
330 m
+ Current 5 k
One-shot sensor 4
2p 0.1
+
V 1.6 M
Over voltage 1.067 V ref 1.5 V ref
1.3 M +
comparator Multiplier
Err Amp 1
3 10 k
0.01 12 k Quickstart
6 2
0.47 m
(b)
Figure 7.3 An offline boost converter. (a) A basic circuit. (b) Implementation using the On
Semiconductor MC33232 Power Factor Controller [7.3].
[© 2005, On Semiconductor, reprinted with permission]