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2. Controlling the Primary Corona Current
Figure 3-521 shows the current that controls the primary corona current, and the circuit has the fol_
lowing functions:
Turns ON/OFF the primary corona current.
l
Executes constant current control.
l
The primary corona current is turned on and off by the primary corona current drive
the mechanism is as follows:
The transformer is driven.
The output of the primary corona current is monitored with reference to its current, and the data is fed
back to the variable width pulse oscillator, thereby ensuring that the primary corona current remains con-
stant. If an overcurrent, because of leakage or example, is detected, the OC signal forces off the pulse out-
put.
When such occurs, the primary corona current will remain OFF for 20 ms and then will return auto-
matically.
Corona current sent to the primary charging assembly.
DC controller
Variable width pulse
oscillator circuit
Figure 3-521
Transformer
CANON CLClWtl REV.1 MAY 1997 PRINTED IN JAPAN (IMPRIME AU
signal (HVPR), and
Corona current
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