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©2002 Fairchild Semiconductor Corporation Application Note 7511 Rev. A1
FIGURE 15A. THIS ALL-ENCOMPASSING PROTECTION SYSTEM PROVIDES THREE INDEPENDENT SHUTDOWN FUNCTONS -
ONE EACH FOR THE UPPER AND LOWER IGTS AND THE HIGH-VOLTAGE SUPPLY.
FIGURE 15B. THIS CIRCUIT PROVIDES CHOPPER DRIVE FOR THE COPPER-WIRE
SENSOR IN FIGURE 15A.
FIGURE 15C. SHOWS THE HIGH-VOLT-
AGE SHUTDOWN CIRCUIT.
50 TO 320V DC
24V
3.9k
750k
3.3k
2.7k
2N5355
470pF
0.01µF
10A
2k
5µF
20V
150
2N5232
15V
5µF
25V
220k
2.2k
0.001
µF
H11F3
H11F3 TO
CONTROL CIRCUIT
39
470
pF
390
20A
2k
2mΩ (1” #24 AWG COPPER)
POWER
SUPPLY
CURRENT
SENSE AND
CHOPPER
AC
AMPLIFIER
LATCHING
FAST
COMPARATOR
10ms
RESET
IGT POWER SWITCHES
A139M
50µH
10k
180k
47k
39k
0.001
µF
1k
2N5306
C203B
0.02
µF
22k
H11AV2 TO PZO SHUTDOWN
H11AV2 TO HI-V SHUTDOWN
22
0.2µF
2
1
TO
DRIVE
DT230F
TO
MOTOR
TIMER
555
13
CHOPPER DRIVE
TO PIEZO
DRIVERS
5V
150150
180
0.002
µF
5.1k
2N5232
H11F3H11F3
100
180
0.002
µF
5.1k
2N5232
0.005µF
150
DT230F
(3)
47k
H11AV2
10µF
10V
ALL OPTOCOUPLERS GO TO PROTECTION CIRCUIT
SG3524
15
16
10
8
HIGH-VOLTAGE SHUTDOWN
24V
TO
CONTRO
L
5V
2.2k
0.005
µF
1M
Application Note 7511