Texas Instruments (TI) introduced a three-phase, gallium nitride (GaN)-based inverter reference design that helps build 200-V, 2-kW AC servo motor drives and next-generation industrial robots. According to TI, the inverter reference design offers higher efficiency, fast current-loop control, and greater efficiency as well as more accurate speed, and torque control.
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Three-phase inverter GaN power stage The Three-Phase High-Frequency GaN Inverter Reference Design features the company’s newest LMG3410 600-V, 12-A GaN power module, which the company introduced last year. The design includes an integrated FET as well as gate driver and protection. The company says that the GaN module enables the design to switch up to 5x faster than silicon FETs. At the same time, the module achieves efficiency levels above 98 percent at 100 kHz and greater than 99 percent at 24 kHz pulse width modulation (PWM) frequency.
In addition to using the GaN module, the reference design relies on TI’s AMC1306 isolated delta-sigma modulators. These delta sigma modulators have current sensing to increase motor control performance. TI’s ISO7831 digital isolator also offers reinforced isolation between the MCU and the design’s six PWMs.
The use of GaN allows designers to optimize switch performance to reduce the motor’s power loss and downsize the heat sink to save board space. When used with low-inductance motors, operating the inverter at 100 kHz helps improve torque ripple.Reference Design Power,
Reference Design Power, Speed, and Performance
TI says that the GaN inverter power stage easily interfaces with microcontrollers (MCU), including the company’s TMS320F28379D drive control system-on-chip that helps dynamically adjust voltage frequency and achieves very fast current loop control.