Basic Circuit Explanation; Power Supply Circuit - Panasonic TC-42P1 Service Manual

Basic Circuit Explanation

1 POWER SUPPLY CIRCUIT

1-1 Power Factor Control (PFC)
1-1-1 Basic operation of the Full wave bridge rectifier
AC in
Feature:
1) Power Factor 0.5 ~ 0.7
2) Spick AC current with high frequency component.
Power Factor control circuit
1-1-2
Feature:
1) Power Factor More than 0.9
2) Automatic Power Factor Control
by OFF period change
3) Lower high frequency noise.
+
VDC
-
VDC
AC in
ON
SWITCH
(sw)
OFF
AC in
0
VDC
0
AC voltage AC current
0
L D
SW
Peak current
- 22 -
+
VDC
-
AC voltage
Average current