GaN power design drives servo drives and robotics with extremely high efficiency

Texas Instruments has introduced an innovative three-phase, GaN-based inverter reference design that helps engineers build 200V, 2kW AC servo motor drives and next-generation industrial robotics with fast current-loop control, higher efficiency, more accurate speed, and torque control. Download the reference design today. Three-phase, GaN-based inverter reference design helps engineers design 200V, 2kW AC servo motor drives and next-generation industrial robotics with fast, more precise torque control and 99 percent efficiency. The reference design features their newest LMG3410 600V, 12A GaN power module with an integrated FET, gate driver and protection, announced last year. The GaN module allows the design to switch up to 5x faster than silicon FETs, while achieving efficiency levels greater than 98 percent at 100 kHz and greater than 99 percent at 24 kHz PWM frequency. With GaN, designers can optimize switch performance to reduce power loss in the motor, and downsize the heat sink to save board space. Operating the inverter at 100kHz significantly helps improve torque ripple when used with low-inductance motors. The GaN inverter power stage easily interfaces with MCU, including their TMS320F28379D drive control system-on-chip to help dynamically adjust voltage frequency and achieve ultra-fast current loop control. TI also introduced today its new DesignDRIVE Fast Current Loop software with innovative sub-cycle PWM update techniques that help push current-loop performance in servo drives to less than one microsecond, potentially tripling motor torque response. The Fast Current Loop software outperforms traditional MCU-based current-loop solutions, and is available free with controlSUITE software. In addition to the GaN module, the reference design relies on the company’s AMC1306 isolated delta-sigma modulators with current sensing to increase motor control performance. Their ISO7831 digital isolator also provides reinforced isolation between the MCU and the design's six PWMs.