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Table 2: BP7B Reference Design Component Selection
Designation
R1
R2
R3
R4
C1, C2, C3
C4
C5
LED1, LED2, LED3, LED4
LED5
IC1
J1
J2
J3
IC2
IC3, IC4, IC5
IC6
Characteristic
4.7K Ω , 0.25W
180 Ω , 0.25W
4.7K Ω , 0.25W
1.8K Ω , 0.25W
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
Slow Opto coupler NEC PS2501
2 position 0.1” right angle single row header
10 position 0.1” right angle single row header
2mm single row bottom entry header receptacle
Powerex VLA606-01R
Powerex VLA106-24151
Powerex VLA106-24151 or VLA106-24154
Description
Brake input pull-up
Input current limiter (15mA@V L =5V)
Fault signal pull-up
Power Indicator Current limiter
Control power decoupling capacitor
Control power decoupling capacitor
DC to DC input decoupling capacitor
Fault indicator LED
Control power LED
Brake signal isolator
24VDC Control power connector
Control signal connector
IPM connector Hirose DF10-31S-2DSA
Control and Fault signal isolator
High side isolated DC/DC converter
Low side isolated DC/DC converter
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; pin 39 of the VLA606-01R
will be pulled 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 BP7B also includes an LED in series
with each fault output (LED1-LED4) to provide a quick
visual indication when the IPM’s fault 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
J1
GND FOU P V P W P Br U N V N W N +V L
F O
W N
V N
U N
B R
V N1
V NC
J2
Powerex isolated DC to DC converters (IC3, IC4, IC5, IC6)
as described above. Each power supply is decoupled at
the IPM’s pins with a low impedance electrolytic capacitor
(C1-C4). These capacitors must be low impedance/high
ripple current types because they are required to supply the
high current gate drive pulses to the IPM’s internal gate
driving circuits. The DC to DC converters are powered
from a single 24VDC supply connected at CN3. The
24VDC supply is decoupled by the electrolytic capacitor C5
to maintain a stable well filtered source for the DC to DC
converters. The current draw on the 24V supply will range
from about 75mA to 200mA depending on the module
being driven and switching frequency. For a more accurate
estimate it is necessary to use the IPM’s circuit current (I D )
versus f C characteristic to obtain the current required by the
IPM being used. The IPM current draw can then be
adjusted using the DC to DC converter efficiency
specification to arrive at the current draw on the 24V
supply. Refer to the general IPM application notes for
detailed information. A power indicator consisting of an
LED (LED5) in series with current limiting resistor (R4) is
provided to show that the 24VDC supply is present.
V WP1
W P
WF O
V WPC
V VP1
V P
VF O
V VPC
V UP1
U P
UF O
V UPC
J3
Figure 5: Interface Circuit PCB layout
Figure 4: BP7B External Connections
4
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