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BP7B Circuit Explanation:
J2
IC6
VLA106-24154/VLA106-24151
VLA106-24154
40
39
38
R3
R2
IC1
1 2 3
IC12
8 9 10 11
16 17
37
36
35
LED4
F O
W N
+
C5
LED5
R4
+V
34
33
32
V N
U N
B R
J1
VLA106-24151
27
IC2
R1
V N1
V N
+
IC5
Figure 2: Isolated DC to DC
Converters for IPM Control Power
26
25
24
23
22
V WP1
C4
A complete schematic of the
BP7B interface circuit is shown in figure
3 and the bill of materials is given in
Table 2. This circuit uses the VLA606-
01R to transfer logic level control signals
between the system controller and the
IPM. The internal optocouplers provide
galvanic isolation to completely separate
the controller from the high voltage in
the power circuit. The BP7B also
18
17
16
15
11
10
9
8
4
3
LED3
LED2
W P
WF O
V WPC
V VP1
V P
VF O
V VPC
+
C
+
C2
IC4
provides isolated control power supplies
to power the IPMs built-in gate drive and
protection circuits.
2
1
The six main IGBT on/off control
signals (U P ,V P ,W P ,U N ,V N ,W N ) are
transferred from the system controller to
the IPM using the VLA606-01R. The
IPM’s active low control inputs are
LED1
V UP1
U P
UF O
V UPC
+
C1
IC3
pulled high by the VLA606-01R. An on
signal is generated by turning on the
internal optocoupler to pull the IPM’s
J3
L-Series IPM
Connector
control input pin low.
The brake IGBT control signal (BR) is transferred from the controller to the IPM using a low speed opto-
coupler (IC1). The active low brake input pin on the IPM is normally pulled high by R1. When the BR control line
(Pin 6 of CN1) is pulled low, current flows in the LED of the brake isolation optocoupler turning on its output and
pulling the IPM’s brake pin low to activate the brake IGBT. If the IPM being used does not have the brake option
then IC1, R1, and R2 can be omitted.
The IPM’s fault output signals are transferred back to the system controller using low speed optocoupled
transistors internal to the VLA606-01R. During normal operation the fault feedback line (pin 9 of J2) is pulled
high to the +V L supply by the 4.7K resistor R3. 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 to the
low speed optocoupler LED (inside the VLA606-01R) and then to the IPM’s fault pin. The optocoupler’s
3
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