PC929J00000F Series
Fig.41 Operations of Shortcircuit Protector Circuit
Anode 3
Cathode
1
Cathode
2
TTL, micro computer, etc.
PC929J00000F
Constant voltage circuit
Amp.
VCC
13 VCC
12 O1
Tr. 1
11 O2
Tr. 2
RG
RC
IGBT
VC
Typ. 150kΩ
9C
IGBT protector
circuit
FS
8
CP
14 10 GND
VEE
Feedback to primary side
1. Detection of increase in VCE(sat) of IGBT due to overcurrent by means of C terminal (pin 9 )
2. Reduction of the IGBT gate voltage, and suppression of the collector current
3. Simultaneous output of signals to indicate the shortcircuit condition (FS signal) from FS (pin 8 ) terminal to
the microcomputer
4. Judgement and processing by the microcomputer
In the case of instantaneous shortcircuit, run continues.
At fault, input to the photocoupler is cut off, and IGBT is
turned OFF.
Remarks : Please be aware that all data in the graph are just for reference and not for guarantee.
Sheet No.: D2-A06302EN
15