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PRECISION TIG 185
THEORY OF OPERATION
E-4 E-4
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HIGH VOLTAGE / HIGH
FREQUENCY CIRCUIT
The control board passes the 115VAC voltage to the
primary of the high voltage transformer. The sec-
ondary of the high voltage transformer is coupled to a
spark gap generator and also to the high frequency
transformer. The high frequency transformer transfers
the high frequency “spark” to the electrode terminal
which is coupled to the TIG torch.
FIGURE E.4 High Voltage/High Frequency Circuit.
INPUT
POWER
SWITCH
MAIN
TRANSFORMER
POLARITY
SWITCH
SCR
BRIDGE
X1
X2
AC
AC
DC+
DC-
CONTROL
BOARD
18VAC
18VAC
115VAC
FAN
REMOTE
RECEPTACLE
H1
H2
H3
SHUNT
115VAC
HIGH VOLTAGE
TRANSFORMER
CIRCUIT
BY-PASS
BOARD
HI-FREQUENCY
TRANSFORMER
C
H
O
K
E
THERMAL
LIGHT
GAS
VALVE
THERMO-
STATS
OUTPUT
CONTROL
MODE
SWITCH
POWER
"ON"
DIGITAL
DISPLAY
F
E
E
D
B
A
C
K
BYPASS
ASBLY
NOTE: Unshaded areas of block logic diagrams are the subject of discussion.