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5.OCP (OVER CURRENT PROTECTION) CIRCUIT
This circuit is designed to protect the circuit from over current due to overload occurred at the rear of 132[V]
line.
1) CONFIGURATION OF OCP CIRCUIT
123 [V] LINE
2) EXPLANATION OF THE OPERATION
¤ There is very little voltage drop at £ R821(1W 0.68) of 123 [V] line.
¤ŁIn case that the overload occurs at the rear of 123[V] line, the increase of the voltage drop at R821 bring
down the base voltage of the Q806 so as to drive the Q806
¤ØBecause of the overload at the rear of the R821, the voltage of the £ point decreases. And this makes Q806
turn on so that a voltage is applied to the #29 of I701.
¤ŒIn case that OCP operates by the #29 of the I701, the set is protected by power off (#32 of I701¡ LOW).
Q806
KSA1013Y
R820
22K
1/4W
+
C
C816
100µ
16V
R822
20K
1/4W
R821
B
A
1W 0.68(F)
R826
D810
20K
UZ-5.1
1/4W
R824
R823
C815
22K
8.2K
4.7µ
1/4W
1/4W
50V
25
I701 #29
(OCP)
FBT
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