GaN Inverter Reference Design Powers Servo Motors And Robots


New innovative three-phase, gallium nitride (GaN)-based inverter reference design from TI helps engineers build 200V, 2kW AC servo motor drives and next-generation industrial robotics with 99 percent efficiency, more accurate speed and torque control. The reference design can be downloaded here.

The GaN module featured in the reference design is said to allow 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 pulse width modulation (PWM) frequency.

The reference design boasts TI’s newest LMG3410 600-V, 12-A GaN power module with an integrated FET, gate driver and protection, announced last year.

TI emphasises that 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 100 kHz significantly helps improve torque ripple when used with low-inductance motors.

The GaN inverter power stage easily interfaces with microcontrollers (MCU), including TI’s TMS320F28379D drive control system-on-chip to help dynamically adjust voltage frequency and achieve ultra-fast current loop control.

TI has also introduced 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 1 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, according to TI.

The reference design also features TI’s AMC1306 isolated delta-sigma modulators with current sensing to increase motor control performance. The firm’s ISO7831 digital isolator also provides reinforced isolation between the MCU and the design’s six PWMs.

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For further details, view the full Press release.


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