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PDF BAP1491 Data sheet ( Hoja de datos )
| Número de pieza | BAP1491 | |
| Descripción | IGBT Gate Drive Board | |
| Fabricantes | APPLIED POWER SYSTEMS | |
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Hay una vista previa y un enlace de descarga de BAP1491 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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APPLIED
POWER
SYSTEMS,
INC.
BAP1491 IGBT Gate Drive Board
BAP1491 IGBT Gate Drive Board for
Three Phase and Full Bridge Inverters
Complete IGBT Gate Drive Board with the following feature:
Current sensing and heatsink
temperature sensing capability
Over voltage protection
Includes all power supplies
DC link voltage sensing
Over current protection
Single 26 pin header for all I/O and
input power
Under voltage lock-out
Diagnostic LEDs
Automatic dead time generation
Shoot through protection
Introduction
The BAP1491 Insulated Gate Bipolar Transistor (IGBT) Gate Drive Board (GDB) discussed in
this Datasheet/Application Note provides a safe, reliable, isolated interface between control
logic and an IGBT based power stage. With minimal development time and cost, an effective
inverter can be designed and built using the techniques described below.
Typically, the most unreliable portion of an inverter design is the power stage. In most if not all
cases, this is due to inadequate control of the power semiconductors. The APS IGBT GDB is a
robust design (see Figure 1 Block diagram) offering the necessary protection features to ensure
a reliable power stage including: two forms of over current protection, DC link over voltage
protection, over temperature protection, and under voltage lockout. Also provided as feedback
signals to the control logic are isolated, analog, real-time representations of each phase output
current, the DC link voltage and a temperature sensor interface that can be mounted on a
heatsink.
124 Charlotte Avenue Hicksville, NY 11801 Ph: 516.935.2230 Fax: 516.935.2603 Web: www.appliedps.com
Page 1 of 12
Rev. 082208
1 page  
APPLIED
POWER
SYSTEMS,
INC.
BAP1491 IGBT Gate Drive Board
signals are held low for at least 8 s. When both
control signals are held low for a minimum of 8 s,
the latched fault will be reset. If the cause of the
fault condition is removed, the control signals will
be applied to the gates and the LED will be
extinguished.
Reset Function
This 8s reset feature is the reason that user
generated dead time is neither required nor
desired. If dead time of 8s is supplied with the
control signals, the unit will not properly latch off on
fault event and will continue to fire during fault
conditions. If an over current fault exists, the GDB
will protect itself and the IGBTs on a pulse-by-
pulse basis. However, the IGBTs may not be able
to turn on into this condition indefinitely. Therefore,
the control logic should heed the warning of the
fault signals and inhibit the control signals when a
fault condition is indicated.
Over Current Protection
The first form of over current protection compares
the feedback from each Hall effect sensor to a
predetermined threshold. When the threshold is
exceeded, all gate drive signals are latched off
within 2 s. They remain latched off until the fault
condition is removed and all customer provided
control signals are held low for at least 8 s.
The over current threshold should be set such that
the voltage overshoot, due to the DC link
inductance (see System Considerations), resulting
at turn off does not reach destructive levels for the
IGBTs being used.
The second form of over current protection on the
three-phase GDB is used only with Powerex F-
series IGBTs. When an over current condition is
detected, the gate-emitter voltage is reduced to
limit short circuit current. The APS GDB senses
this condition and performs a soft turn-off of the
IGBT conducting the excessive current. This form
of over current is typically a shoot through with no
load impedance to limit its magnitude. Therefore,
a soft turn off is necessary to limit the voltage
overshoot at turn off to a safe level. Upon
detection of this condition the soft turn off is
performed, all gate drive signals are latched off,
and the associated phase’s LED is illuminated.
The gate signals remain latched off until the fault
condition is removed and all customer provided
control signals are held low for at least 8 s. An
over current or short circuit fault output signal is
annunciated for each phase leg on J1-pins 3, 6
and 9, see page 10 for additional information.
Over Voltage Protection
The over voltage protection senses the DC link
input and compares it to a predetermined
threshold, 910 volts for 1200 volt devices and 450
volts for 600 volt devices. When the threshold is
exceeded for more than 1ms, the gate pulses are
latched off 2 s later, and the over voltage LED is
illuminated. The gate signals remain latched off
until the fault condition is removed and all
customer provided control signals are held low for
at least 8 s. An over voltage fault output signal is
annunciated on J1 pin 11, see page 10 for more
information.
Over Temperature Protection
The over temperature protection uses the
temperature sense input and compares it to a
predetermined threshold, 98 2 C. When the
threshold is exceeded for 1ms, the gate pulses are
latched off 2 s later and the over temperature LED
is illuminated. The gate signals remain latched off
until the temperature sense input goes below 98 C
and all customer provided control signals are held
low for at least 8 s. An over temperature fault
output signal is annunciated on J1 pin 11, see
page 10 for more information.
Under Voltage Lock Out (UVLO)
The UVLO protection monitors the 15-volt logic
supply, latches off the gate pulses and illuminates
the UVLO LED if the 15-volt supply dips below 12
volts.
There is also an UVLO on each gate drive chip.
When the power supply for a gate drive chip
droops to a value that precludes the IGBT from
being driven into saturation, the gate pulses are
latched off and the associated phase’s over current
LED is illuminated. The gate signals remain
latched off until the fault condition is removed and
all customer provided control signals are held low
for at least 8s. A UVLO fault output signal is
annunciated on J1 pin 11, see page 10 for more
information.
124 Charlotte Avenue Hicksville, NY 11801 Ph: 516.935.2230 Fax: 516.935.2603 Web: www.appliedps.com
Page 5 of 12
Rev. 082208
5 Page 
APPLIED
POWER
SYSTEMS,
INC.
BAP1491 IGBT Gate Drive Board
ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND of GDB Power Supply)
Parameter
Unregulated 24 VDC Power Supply
Regulated 15 VDC Power Supply
PWM Input High
PWM Input Low
Fault Output Supply Voltage
Fault Output Current (sink)
DC Link Voltage Input
Switching Frequency
Value
30
15.5
20
-5
30
50
1000
See Figure Below
Units
V
V
V
V
V
mA
V
Hz
ELECTRICAL CHARACTERISTICS
Characteristic
Unregulated 24 VDC Power Supply
Regulated 15 VDC Power Supply
PWM Input ON Threshold*
PWM Input OFF Threshold
Gate Drive Output Voltage High
Gate Drive Output Voltage Low
OverTemp Threshold
OverVoltage Threshold
Temp Sense Feedback
DC Link Voltage Feedback
GDB Power Consumption from 24 or 15 VDC
Min Typ Max
20 24 30
14.5 15 15.5
12 15
02
13 15 18
-6 -5 -3.5
98 100 102
900 910 920
See Figure Below
See Figure Below
See Figure Below
NOTE: The AP-1491 can be modified to accept TTL level PWM control signals. See Fax form at the end of this Datasheet/Application Note.
Unit
V
V
V
V
V
V
C
V
V
V
Watts
124 Charlotte Avenue Hicksville, NY 11801 Ph: 516.935.2230 Fax: 516.935.2603 Web: www.appliedps.com
Page 11 of 12
Rev. 082208
11 Page | ||
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