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BP6A Circuit Explanation:
Figure 3: BP6A L-Series IPM Interface Circuit Schematic
A complete circuit
IC6
V WN1
schematic of the BP6A
interface is shown in figure 3
and the bill of materials is
given in Table 2. This circuit
R7
C6
R6
W N
W NFO
V WNC
+ C14
IC18
R14
D7
uses two types of
D6
1 2 3 8 9 10 11
optocoupled transistors to
transfer logic level control
signals between the system
controller and the IPM. The
optocouplers provide
galvanic isolation to
completely separate the
controller from the high
voltage in the power circuit.
The BP6A also provides
isolated control power
supplies to power the IPM’s
built-in gate drive and
R13
IC12
IC5
IC11
IC4
C5
R5
D5
C4
R4
V WP1
W P
W PFO
V WPC
CN5
V VN1
V N
V NFO
V VNC
VLA106-24151
+ C13
IC17
1 2 3 8 9 10 11
VLA106-24151
+ C12
+
C7
IC16
protection circuits.
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
high speed optocoupled
R12
R10
IC10
IC3
D4
C3
R3
V VP1
V P
V PFO
V VPC
1 2 3 8 9 10 11
VLA106-24151
+ C11
IC15
transistors (IC1-IC6). To
maintain noise immunity, high
speed optos generally require
a film or ceramic decoupling
capacitor connected near
their V CC and GND pins (C1-
C6). The IPM’s active low
control inputs are pulled high
(off state) by resistors (R1-
R6). An on signal is
generated by turning on the
opto-coupler to pull the IPM’s
control input pin low. The
resistance of the control input
pull up resistors is selected
low enough to avoid noise
pick up by the IPM’s high
R11
CN1
R9
R8
IC9
IC2
IC8
IC1
IC7
D3
C2
R2
D2
C1
R1
D1
CN4
V UN1
U N
U NFO
V UNC
V UP1
U P
U PFO
V UPC
CN3
1 2 3 8 9 10 11
VLA106-24151
+ C10
+
C8
IC14
1 2 3 8 9 10 11
VLA106-24151
+ C9
IC13
1 2 3 8 9 10 11
VLA106-24151
+V
C
impedance input and high
enough so that the high
+V L W N V N U N
W P V P U P FO GND
CN2
speed opto-transistor with its relatively low current transfer ratio can still pull the IPM’s input low enough to
assure turn on. The high speed optocouplers must have very high common mode transient noise immunity. For
reliable operation in IGBT power circuits optocouplers with internal shielding and a minimum common mode
transient noise immunity of at least 10,000 V/μs should be used. The BP6A is designed to use the Agilent
HCPL4504 opto-coupler which has a minimum common mode transient noise immunity of 15,000V/ μ s.
The IPM’s fault output signals are transferred back to the system controller using low speed optocoupled
transistors (IC7-IC12). 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 supply through the low speed
3
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