Table of Contents
Advertisement
6. DC power circuit
(1) Block diagram
This power circuit is composed of the main section and the copy lamp
section. The AC power is rectified by the main section, and switching-
transformed by the DC/DC convertor, and rectified and smoothed
again to provide DC power voltages of the loads. The copy lamp
section directly rectifies the AC power, which is then switching-trans-
formed by the DC/DC convertor to provide the output voltage to
change the lamp light quantity.
Noise filter
ACin
circuit
Full-wave
rectifying
circuit
Invertor circuit
Rectifying/
Rush current
(Forward
smoothing
limit circuit
convertor)
Overcurrent
protection
circuit
Convertor
Rectifying/
smoothing
transformer
(T701)
Rectifying/
smoothing
Control
circuit
(PC701)
Overcurrent
protection
(PC702)
circuit
(PC703)
9 – 22
Chopper
circuit
Chopper
circuit
Rectifying/
Regulator
smoothing
circuit
Rectifying/
Regulator
smoothing
circuit
FW circuit
38V
24V
5V
12V
-5.2V
-20V
FW
Advertisement
Table of Contents
