BG2C – Universal Gate Drive Prototype Board
Application Notes
Description: The BG2C is a two channel gate drive circuit designed for use with high frequency optimized IGBT
modules. The BG2C utilizes Powerex VLA513-01R hybrid gate drivers and VLA106 series DC- to- DC converters
to provide efficient switching of modules rated up to 300A. The hybrid gate drivers include high speed opto-couplers
with typical propagation delay times as short as 200ns for control signal isolation. The hybrid DC-to-DC converters
provide fully isolated control power for each driving channel.
Features:
3A or 5A Peak Output Current
2500VRMS isolation for control power and signals
Standard AMP MTA .100” input connector
Operates from a single 15 VDC or 24 VDC supply
Wide output voltage swing +15V/-8V
Low parts count – only 17 parts for two channels
Compact Size 2.7” x 2.4” (69mm x 61mm)
Applications:
BG2C is designed for use with Powerex NFH series
and CM***DUS-12F high frequency IGBT
modules.
Use VLA106-15242 DC-to-DC converter for
operation with 15 VDC control power
Use VLA106-24242 DC-to-DC converter for
operation with 24 VDC control power
Ordering Information: BG2C-5015 is a kit with a bare BG2C board, two VLA513 and two VLA106-15242s
BG2C is a bare PCB only
BG2C Application Guide
Gate Driver
Part Number
VLA513-01R
Peak Drive
Current (IOP)
+/- 5A
Minimum
RG
2.0 Ω
Typical Application*
(IGBT Module Rating)
Up to 600A
DC/DC
Converter
VLA106-15242
For 15VDC Input
VLA106-24242
For 24VDC Input
* Compatible IGBT module depends on voltage rating, switching frequency and selected RG. Refer to Powerex application notes for details.
Note: For high frequency applications using modules with current ratings larger than 300A, the Powerex VLA502-01 driver is recommended.
Publication Date: 02-03-2016
Rev. 1
1
Figure 1: VLA513-01R Block Diagram
Figure 2: VLA106-15242, VLA106-24242
Block Diagram
Application Notes
Circuit Explanation: The BG2C is a basic two channel gate driver designed around the recommended application
circuits for the Powerex VLA513-01R hybrid IGBT gate drivers in combination with either VLA106-15242 or
VLA106-24242 isolated DC-to-DC converters.
A functional block diagram of the VLA513-01R hybrid gate drivers is shown for reference in Figure 1. These gate
drivers are optimized for use with Powerex NFH series and CM**DUS-12F IGBT modules. The drivers use a
high speed open collector type opto-coupler to provide 2500VRMS isolation of control signals. The output stage is
designed to provide high current gate drive with the appropriate on- and off-state bias voltages for large IGBT
modules. For additional detailed information on the characteristics and operation of these gate drivers please
refer to the individual device datasheets.
Figure 2 shows a block diagram of the VLA106-15242 and VLA106-24242 hybrid DC-to-DC converters. These two
devices are identical except that VLA106-15242 is designed to operate from a 15 VDC input and the VLA106-24242
is designed to operate from a 24 VDC input. These DC-to-DC converters use a transformer to provide 2500VRMS
isolation for gate drive power. The converter’s regulated 24VDC output is split using a resistor and zener diode
to provide +15.8V and -8.2V for the hybrid gate driver. For additional detailed information on the operation of the
hybrid DC-to-DC converters please see the individual device datasheets.
A complete schematic and component selection guide for the BG2C is shown in Figure 3. The board will
normally be operated with two input voltage sources. A 5V logic source (+V L) provides drive for the high speed
opto-couplers inside the hybrid gate drivers. A control power supply (+VS) provides power for the gate driver and
is connected to the primary side of the DC-to-DC converters at Pins 8, 9 and 10, 11. The +VS source is decoupled
with a low impedance electrolytic capacitor C1. The capacitor is connected close to the input pins of the DC-to-DC
converters to provide a stable, well-filtered DC source. A 390µF capacitor was selected for C1 to provide the
required ripple current and filtering assuming a maximum driven load and a significant distance to the main filter
capacitor of the +VS supply. These capacitors will be larger than necessary if the driven load is smaller or the VS
supply main filter capacitors are nearby. The DC-to-DC converters provide isolated gate drive power which
consists of +15.8V (VCC) at Pin 3 and -8.2 (VEE) at Pin 1 with respect to common at Pin 2. The gate drive power
supplies are decoupled using the low impedance electrolytic capacitors C2, C3, C4, and C5. It is very important
that these capacitors have low enough impedance and sufficient ripple current capability to provide the
required high current gate drive pulses. The 390µF low impedance capacitors used on the BG2C are sized to
supply 5A gate pulses at a 60 KHz rate. If the application is operating at lower frequency or lower peak current it
may be possible to reduce the size of these capacitors.
The isolated VEE and VCC supplies provided by the DC-to-DC converters are connected to the hybrid gate
drivers at Pins 6 and 8 to provide gate drive power. The hybrid gate driver amplifies the control input signal and
produces high current gate drive at Pin 7. The gate drive current is adjusted by selecting the appropriate series
gate resistance (RG). RG will normally be adjusted to provide suitable drive for the module being used
considering dynamic performance, losses and switching noise. For more information on selecting R G see Powerex
IGBT module application notes. Protection against gate voltage surges is provided by Z1, Z2, Z3, and Z4. These
zener diodes also help to control short circuit currents by shunting miller current away from the gate.
Publication Date: 02-03-2016
Rev. 1
2
Application Notes
Component Selection:
Designation
Z1, Z2, Z3, Z4
C1, C2, C3, C4, C5
CN1, CN2**
Typical Value
16V, 1W
390µF, 35V
MTA .100”
Description
Gate voltage surge protection
Power supply filter – Electrolytic, low Impedance
Input and gate connections
Example: Mfg./PN
1N4745
Panasonic EEU-FC1V391S
AMP 640457-6
**Recommended mating connector AMP CST-100 Housing P/N 770602-6 with crimp contact 770666-2.
Figure 3: BG2C Schematic and Component Selection
Interface Circuit Requirements: A typical interface circuit for the BG2C is shown in Figure 4. A single control
power supply (+VS) is connected to Pin 5 of CN1 with its common at Pin 6. This supply provides all of the gate drive
power for both channels via the hybrid DC-to-DC converters. The current drawn from the +VS supply will vary from
less than 100mA to more than 500mA depending on the switching frequency and size of IGBT being driven.
Consult the hybrid gate driver application notes for details on determining the required supply current for the gate
driver. The gate driver supply current can then be converted into current drawn from the +VS supply using the
efficiency specification on the DC-to-DC converter datasheet.
A 5V logic supply is connected at Pin 1 of CN1 and shares the same common at Pin 6 of CN1 as the 15V control
supply. The 5V supply is directly connected to Pin 2 of the hybrid gate driver which is internally connected
to the anode of the LED in the high speed opto-coupler.
Figure 4: BG2C External Wiring Diagram
Publication Date: 02-03-2016
Rev. 1
3
The control signal interface is designed for use with standard 5V CMOS logic. The control input signals at Pins 2
and 3 of connector CN1 are used to turn the IGBTs on and off. These signals are active low which means that the
gate driver output will be high (IGBT on) when they are pulled low. These control pins are connected directly to
Pin 1 of the hybrid gate driver which is connected internally through a 180Ω limiting resistor to the cathode of the
LED in the high speed opto-coupler (see Figure 1). When the control signal is pulled low, current flows from the 5V
logic supply through the LED to turn the gate driver’s output on. The control pins must be pulled low with a buffer
that is capable of sinking at least 16mA in order to turn on the high speed opto-coupler inside the hybrid gate driver.
A CMOS buffer that actively pulls its output high in the off state (74HC04 or similar) is recommended for
maintaining good common mode noise immunity. Open collector drive that allows IN1 and IN2 to float will degrade
common mode noise immunity and is therefore not recommended.
Application Notes
Printed Circuit Layout: Figure 5 shows the layout of the BG2C two channel gate driver board. The compact
2.7” x 2.4” circuit board with only 17 components clearly demonstrates the advantage of using hybrid gate
drivers and DC-to-DC converters. One important feature is the use of three ground plane islands for the regions of
the PCB having high voltage differences. Two of the islands are tied to the IGBT emitter/circuit common (Pin 2 of
the DC-to-DC converters) of each output channel. The third island is connected to logic interface common at Pin 6
of CN1. This layout provides shielding to help prevent undesirable coupling of noise between the control side and
the gate drive channels.
Additional Information: Detailed information about the operation and electrical characteristics of the
VLA513-01R hybrid gate driver can be found on the individual device datasheets. Electrical characteristics
such as input voltage range, efficiency, and output voltage regulation of the VLA106-15242 and VLA106-24242
DC-to-DC converters can also be found on the individual device data sheets. Information about calculating gate
drive current and selection of series gate resistors (RG) can be found in the general IGBT module and gate drive
application notes. For applications using higher current IGBT modules refer to the application notes for the
VLA502-01 hybrid gate driver and BG2A reference design. All of these documents are available on the Powerex
website at www.pwrx.com. For design assistance with any of the products covered in this application note
contact Powerex at (724) 925-7272 and request application engineering. For product pricing and availability call the
Power Line: 1-800-451-1415
SOLDER SIDE
COMPONENT SIDE
Figure 5: BG2C Printed Circuit Board Layout
Publication Date: 02-03-2016
Rev. 1
4
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