PC928 Просмотр технического описания (PDF) - Sharp Electronics
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производитель
PC928 Datasheet PDF : 10 Pages
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PC928
Fig. 24 Overcurrent Detecting Voltage
vs. Supply Voltage
25
Ta = 25˚C
IF = 10mA
VCC = 24V
20 RG = 47Ω
CG = 3 000pF
RC = 1k Ω
FS = OPEN
15 CP = 1 000pF
Added resistance=0 Ω
10
0.5k Ω
1k Ω
5
1.5k Ω
0
15
18
21
24
27
30
Supply voltage Vcc (V)
Overcurrent Detecting Voltage -
Supply Voltage Characteristics Test Circuit
Anode
VCC
IF
Cathode
O1
O2
RG
V RC
C
VO2
CP
FS
GND
VCC
CG
V VC
Application Circuit (IGBT Drive for Inverter)
Anode
VCC
Anode
Cathode
O1
+
VCC1= 12V
(+)
O2
RG
IGBT
TTL, microcomputer, etc.
RC
U
V
W
C
FS
+
VCC2 = 12V CP
GND
(-)
Feedback to primary side
s Operations of Shortcircuit Protector Circuit PC928
Anode
Light emitting diode
1
Anode
Cathode
2
Constant voltage circuit
3
Amp.
TTL, microcomputer, etc.
Photodiode
Interface
IGBT protector circuit
14 GND
VCC
13 VCC
12 O1
11 O2
RG
C
9
FS
8
GND
10
IGBT
RC
CP
VEE
Feedback to primary side
1. Detection of increase in VCE(sat) of IGBT due to overcurrent by means of C-terminal ( 9 terminal)
2. Reduction of the IGBT gate voltage, and suppression of the collector current
3. Simultaneous issue of signals to indicate the shortcircuit condition (FS signal) from FS 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.
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