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Table 2: BP7A Reference Design Component Selection
Designation
R1, R2, R3, R4, R5, R6
R7
R8, R9, R10, R11, R12, R13, R14
R15
R16
C1, C2, C3, C4, C5, C6
C7, C8, C9
C10
C11
D1, D2, D3, D4
D5
IC1, IC2, IC3, IC4, IC5, IC6
IC7, IC9, IC10, IC11
IC8
CN1
CN2
CN3
IC12
IC13, IC14, IC15
Characteristic
15K ? , 0.25W
4.7K ? , 0.25W
180 ? , 0.25W
4.7K ? , 0.25W
1.8K ? , 0.25W
0.1 μ F, 50V Multi-Layer Ceramic
39 μ F, 35V, 105C, Low imp.
150 μ F, 35V, 105C, Low imp.
560 μ F, 50V, 105C, Low imp.
Super bright red LED
Super bright green LED
Fast Opto coupler HCPL 4504
Slow Opto coupler NEC PS2501
Slow Opto coupler NEC PS2501
10 position 0.1” right angle single row header
2mm single row bottom entry header receptacle
2 position 0.1” right angle single row header
Low side isolated DC/DC converter
High side isolated DC/DC converter
Description
Control input pull-up
Brake input pull-up
Input current limiter (15mA@V L =5V)
Fault signal pull-up
Power Indicator Current limiter
High speed opto decoupling capacitor
Control power decoupling capacitor
Control power decoupling capacitor
DC to DC input decoupling capacitor
Fault indicator LED
Control power LED
Control signal isolator
Fault signal isolator
Brake signal isolator
Control signal connector
IPM connector Hirose DF10-31S-2DSA
24VDC Control power connector
Powerex VLA106-24151 or VLA106-24154
Powerex VLA106-24151
pulling the IPM’s brake pin low to activate the brake
IGBT. If the IPM being used does not have the brake
+ -
option then IC8, R7, and R10 can be omitted.
The IPM’s fault output signals are transferred
back to the system controller using low speed
optocoupled transistors (IC7, IC9, IC10, IC11). During
normal operation the fault feedback line (pin 2 of CN1)
is pulled high to the +V L supply by the 4.7K resistor
R15. When a fault condition is detected by the IPM it
will immediately turn off the involved IGBT and pull its
fault output pin low. The IPM’s fault output has an
open collector characteristic with an internal 1.5k ohm
limiting resistor. Current flows from the +15V local
isolated supply through the low speed optocoupler’s
LED to the IPM’s fault pin. The optocoupler’s
transistor turns on and its collector pulls the fault
feedback line low to indicate a fault. If any of the
IPM’s four fault output signals become active its fault
isolation opto will pull the fault feedback line low.
Slow optos are used because they offer the
advantages of lower cost and higher current transfer
ratios. High speed is not necessary because the IPM
disables a faulted device and produces a fault signal
for a minimum of 1ms. The BP7A also includes an
LED in series with each fault output (D1-D4) to
provide a quick visual indication when the IPM’s fault
CMOS
type buffer
must sink
15mA
RC Filter to
remove noise
on fault signal
RC~10us
+V L
W N
V N
U N
Br
W P
V P
U P
FO
GND
CN1
CN3
F O
W N
V N
U N
B R
V N1
V NC
V WP1
W P
WF O
V WPC
V VP1
V P
VF O
V VPC
signal is active. This was included for trouble
shooting purposes only so it can be replaced by a
jumper without affecting the operation of the interface
circuit.
Isolated control power for the IPM is supplied
by Powerex isolated DC to DC converters (IC12,
IC13, IC14, IC15) as described above. Each power
supply is decoupled at the IPM’s pins with a low
impedance electrolytic capacitor (C7-C10). These
capacitors must be low impedance/high ripple current
4
Figure 4: BP7A External Connections
V UP1
U P
UF O
V UPC
CN2
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