High-Fidelity 8-Channel Gate Driver Module for Mechatonics Applications
High-Fidelity 8-Channel Gate Driver Module for Mechatonics Applications
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As part of a project on electrical machines, motor control, and inverter design, I designed and manufactured a high-fidelity gate driver module. It can also be utilized for robotics applications. The high-fidelity 8-channel gate driver circuit module is appropriate for IGBT and MOSFET, and is based on the ACPL-A337J isolated gate driver optocoupler IC from Avago Technologies. The features and specifications of the optocoupler are shown below.
Features
Smart Gate Drive Optocoupler
Avago Technologies' optically isolated gate drive devices are optimized to drive IGBT/power MOSFET transistors.
This highly integrated smart gate drive optocoupler incorporates protection features such as active Miller clamp, under-voltage lockout, fault/UVLO status feedback, and desaturation detection.
Besides the protection features, it also includes a DC-DC controller for the floating power supply.
This isolated gate driver optocoupler is ideal for motor control and power conversion applications.
It isolates and protects logic signals from high voltages.
Specifications
Mounting type: Surface mount
Maximum forward voltage: 1.95V
Number of channels: 1
Number of pins: 16
Package type: SO
Input current type: DC
Typical rise time: 80ns
Maximum input current: 400 mA
Isolation voltage: 5 kVrms
Logic output: Yes
Typical fall time: 45ns
The designed system is an isolated gate driver modular system with 8 independent channels. The module provides a breakout section with a 40-pin connector for attaching a DEO-Nano board to the low voltage and current side of the optocouplers.
The high-voltage side of the optocoupler is connected to a DC-DC converter boosting the isolated PWM signal to a +15/-15 V, adequate for driving MOSFET / IGBT switches. The MGJ2D051505SC DC-DC converter is utilized in the implementation. The system architecture illustrating the power distribution in the driver board is shown below.
The Deo-Nano board is based on an Altera Cyclone IV EP4CE22F17C6N FPGA, which is used for PWM signal generation and enhanced control implementation. The conceptual model, showing all subsystems, is presented below. Other PWM signal generation, such as Arduino, Raspberry Pi, STM32 Microcontrollers, etc., can also be connected to the board through the breakout 40-pin section.
The system module was developed with KiCad V.5.0.2. The PCB layout of the board is presented in the figure below. The board is 180x80 mm with all components packed on a two-sided, two-layer implementation.
The design process was completed with the manufacturing and testing of the board. The manufactured system is presented below. The complete subsystems, all assembled, are also shown.
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