M57159L-01

BG2B-5015 POWEREX | Alldatasheet

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Publication Date: 02-03-2016 1 Rev. 1 Application Notes BG2B – Universal Gate Drive Prototype Board Description: The BG2B is a two channel gate drive circuit for high power IGBT modules. The BG2B utilizes Powerex hybrid gate drivers and DC-to-DC converters to provide efficient switching of modules rated up to 400A. The hybrid gate drivers include high speed opto-couplers for control signal isolation and desaturation detection to protect the IGBT from short circuit conditions. The hybrid DC-to-DC converters provide fully isolated control power for each driving channel. The BG2B also provides an isolated fault feedback signal. Features: Applications:  1.5A, 3A or 5A Peak Output Current BG2B is designed for use with Powerex NF- and  2500VRMS isolation for control power and signals A- series IGBT modules.  Standard AMP MTA .100” input connector  Use VLA106-15242 DC-to-DC converter for  Operates from a single 15 VDC or 24 VDC supply operation with 15 VDC control power  Wide output voltage swing +15V/-8V  Use VLA106-24242 DC-to-DC converter for  Compact Size 3” x 2.2” (76mm x 56mm) operation with 24 VDC control power BG2B-3015 is a kit with a bare BG2B board, two VLA541-01R and two VLA106-15242 BG2B-5015 is a kit with a bare BG2B board, two VLA542-01R and two VLA106-15242 Gate Driver Part Number Peak Drive Current (IOP) Minimum RG Typical Application* (IGBT Module Rating) DC/DC Converter M57159L-01 +/- 1.5A 4.2 Ω Up to 100A VLA106-15242 For 15VDC Input VLA106-24242 For 24VDC Input VLA541-01R +/- 3A 3.0 Ω Up to 200A VLA542-01R +/- 5A 2.0 Ω Up to 600A * Compatible IGBT module depends on voltage rating, switching frequency and selected RG. Refer to Powerex application notes for details. Note: VLA541-01R and VLA542-01R gate drivers replace older types VLA504 -01, VLA503 -01, M57959L and M57962L. VLA106-15242 replaces the older M57145L-01.

Publication Date: 02-03-2016 3 Rev. 1 Application Notes Component Selection: Designation Typical Value Description Example: Mfg./PN D1, D2, D3, D4 0.5 A, 1000V VCE detection diode – ultra fast recovery ON Semi MUR1100E DZ1, DZ2, DZ4, DZ5 16V, 1W Gate voltage surge protection 1N4745 DZ3, DZ6 30V, 1W Detect input pin surge voltage protection 1N4751 C1, C2, C5, C6 82F, 35V Power supply filter – electrolytic, low Impedance Panasonic EEU-FC1V820 C4, C8 150uF, 35V Control power filter – electrolytic, low impedance Panasonic EEU-FC1V151 R1, R2 4.7kΩ, 0.25W Fault sink current limiting resistor R3 4.7KΩ, 0.25W Fault feedback pull-up resistor OP1, OP2 NEC PS2501 Opto-coupler for fault signal isolation NEC PS2501 CN1** MTA .100” Input and gate drive connectors AMP 640457-6 CN2 ¼” Ring Lug Collector voltage sensing connection AMP 34151 * Not required in all applications. Please see hybrid gate driver application notes/datasheets for details. ** Recommended mating connector AMP CST-100 Housing P/N 770602-6 with crimp contact 770666-2. Figure 3: BG2B Schematic and Component Selection Short-circuit protection is provided by means of desaturation detection. For details on the operation of this circuit consult the hybrid gate driver individual datasheets. The collector voltage of each IGBT is detected through the series connected high voltage blocking diodes D1, D2 and D3, D4. The combined blocking voltage of the series connected diodes must be equal to or greater than the VCES rating of the IGBT. For applications using lower voltage IGBT modules it is possible to use a single detection diode in each channel. DZ3 and DZ6 protect the gate driver’s detect input (Pin 1) from voltage surges during reverse recovery of the high voltage blocking diodes. The capacitors C3 and C7 are used to adjust the driver’s protection circuit trip time. The driver’s default settings are sufficient for many applications so it may be possible to omit these capacitors. For details on the use of C3 and C7 consult the individual gate driver datasheets. If the gate driver’s short-circuit protection is activated, it immediately shuts down the gate drive and pulls Pin 8 low to indicate a fault. Current flows from Vcc (Pin 3 of DC-to-DC converter) through the LED in fault isolation opto (OP1, OP2) to Pin 8. The transistor in the fault isolation opto turns on and pulls the fault signal line (FO) at Pin 4 of CN1 low. This opto isolated signal can now be used by the controller to detect the fault condition.

Publication Date: 02-03-2016 4 Rev. 1 Application Notes Interface Circuit Requirements: A typical interface circuit for the BG2B 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. Figure 4: BG2B External Wiring Diagram A 5V logic supply is connected at Pin 1 of CN1 and shares the same common at Pin 6 of CN1 as the15V control supply. The 5V supply is directly connected to Pin 14 of the hybrid gate driver which is internally connected to the anode of the LED in the high speed opto-coupler. The 5V supply is also used to pull the output side of the fault isolation opto-couplers high. 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 13 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. The fault signal line on Pin 4 of CN1 is active low which means that a fault condition will be indicated by a low level signal. During normal operation Pin 4 is pulled high to the +VL supply by the 4.7K resistor R3. If either of the hybrid gate drivers detects a short circuit condition, its fault isolation opto (OP1, OP2) will turn on and pull Pin 4 of CN1 low. When a fault is detected the hybrid gate drivers disable the output and produce a fault signal for a minimum of 1ms. Any signal on the fault line that is significantly shorter than 1ms cannot be a legitimate fault so it should be ignored. Therefore, for a robust noise immune design, it is recommended that an RC filter with a time constant of approximately 10μs be added between Pin 4 and the controller as shown in Figure 4.

Publication Date: 02-03-2016 5 Rev. 1 Application Notes Component Side Solder Side Figure 5: BG2B Printed Circuit Board Layout Printed Circuit Layout: Figure 5 shows the layout of the BG2B two channel gate driver board. The compact 3” x 2.2” circuit board with only 24 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 M57159L-01, VLA542-01 and VLA-541-01 hybrid gate drivers 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 datasheets. 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 VLA500-01 hybrid gate driver and BG2A reference design. For applications using high frequency optimized NFH series IGBT modules refer to the VLA502-01 application note. 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 your local Powerex representative or Powerex application engineering at (724) 925-7272.