New high-voltage three-phase high PWM frequency inverter reference design provides faster, more accurate drive control
Beijing, June 28, 2017— Texas Instruments (TI) has introduced an innovative three-phase gallium nitride (GaN) inverter reference design that helps engineers build 200 V, 2 kW AC servo motor drives and A generation of industrial robots with fast current loop control, higher efficiency, more precise speed and torque control. Download the reference design now.
The three-phase high-frequency GaN inverter reference design uses TI's latest LMG3410 600-V, 12-A GaN power module last year with integrated FET, gate driver and protection. The GaN module allows design switches to be five times faster than silicon FETs, achieves efficiencies above 98% at 100 kHz, and achieves efficiencies above 99% at 24 kHz pulse width modulation (PWM) frequencies. With GaN, designers can optimize switching performance, reduce motor power loss, and reduce heat sink size to save board space. When used with a low-inductance motor, running the inverter at 100kHz greatly improves torque ripple.
Power, speed and performanceThe GaN inverter power stage can be easily interfaced with a microcontroller (MCU), including TI's TMS320F28379D drive control system-on-chip to help dynamically adjust voltage frequencies and achieve ultra-fast current loop control. TI has also introduced the new DesignDRIVE fast current loop software with innovative sub-cycle PWM update technology to help improve the current loop performance in servo drives to less than 1 microsecond, which is three times the motor torque response. This fast current loop software is superior to traditional MCU-based current loop solutions and is free to use controlSUITETM software.
In addition to the GaN module, this reference design relies on TI's AMC1306 isolated delta-sigma modulator with current sensing to improve motor control performance. TI's ISO7831 digital isolator also provides enhanced isolation between the MCU and the six PWMs of the design.
Key benefits of TI's new three-phase inverter design· High efficiency power stage: 98% at 100kHz PWM and 99% at 24kHz PWM, reducing heat sink size
· High Pulse Width Modulation (PWM) frequency: High PWM switching frequency enables low inductance motors to be driven with very small current ripple
· Fast switching conversion: less than 25ns, no switching node voltage ringing, reducing electromagnetic interference
· 600V and 12A LMG3410 GaN FET power stages with more than 7 million device reliability hours: for fast and easy PCB layout and small form factor design.
Other design resources· Read the new white paper "High-Precision Motor Drive Control for Industrial Progress."
· Learn more about the LMG3410 module, "Optimizing GaN performance with integrated drivers."
· Get ​​more information about TI motor drives and smart grid infrastructure systems.
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