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TRC-70
CIRCUIT DESCRIPTION
Protection Circuit Configuration
*
Temperature protection circuit
module (X59-3370-00) is activated, switching transis-
tor Q1 on, and fan motor M11 is driven.
When the heat sink temperature becomes still higher
and the thermistor temperature exceeds 90 degrees
C, comparator
IC1 (a/2) is activated and the output
goes high (approximately 7 V). The power select cir-
cuit is then activated reducing the output power to
approximately 30 W.
.
BV
THi
FOK
ZI: X59-3370-00
Fig. 18 Temperature protection circuit
* Overvoltage protection circuit
When the supply voltage exceeds approximately 20
V, the base of switching transistor Q7 goes high turn-
ing it on; which in turn turns on Q8. As a result, relay
K1 connected to the POWER switch is set off and the
power is switched off.
DH
R27
13.6V DC
B
—t
rt
ro
fopo
ga T
o
O}O O
ot
x
E
q
a7
fe
2
-
Wo
P
E
[oa
Fig. 19 Overvoltage protection circuit
21
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