PRINCIPLES OF OPERATION
REV.-A
When PC1 is activated, the voltage at shunt regulator gap G reaches at least 2.5 V, K-A becomes a conduc-
tor, Q3 goes on, Q2 goes on, and shunt transistor Q1 goes off.
Even if PC1 is not activated, K-A will conduct if current I in the transformer’s primary winding surpasses
a certain value, creating a potential difference of at least 2.5 V across resistance R4. Resistance R4, in other
words, serves as an excess current detector.
NOTE:
Items in parentheses refer to the 220/240 V version.
Figure 2-23. Switching Circuit (During PC1 Operation)
NOTE:
Items in parentheses refer to the 220/240 V version.
Figure 2-24. Over-Current Protection (OCP)
2-20
LQ-510
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