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ZYNQ-7000® Silicon Carbide 3-Level Inverter


Xilinx at SPS Drives 2014 | Qdesys







We engineered a Multilevel Silicon Carbide converter that provide more than two levels of voltage to achieve smoother and less distorted dc-to-ac power conversion for motor drives and energy applications.


3-Level inverter have the following benefits:

A. Smaller output voltage steps that mitigate motor issues due to long power cables between the inverter and the motor.

B. Reduced surge voltages and rate of voltage rise at the motor terminals and motor shaft bearing currents.

C. Cleaner output waveform providing an effective switching frequency twice that of the actual switching frequency.


3-Levels inverter use Silicon Carbide.






Click images to enlarge




Click images to enlarge




We built this reference design implementing a laptop size 10KW 3-Level TNPC (or NPC2 or also 3LT2C) Silicon Carbide Inverter.



Silicon Carbide (SiC) is a semiconductor comprised of silicon (Si) and carbon (C).
It sustains high voltages with low series resistance and low conduction losses.
SiC allows switching higher voltages and currents at higher temperatures (175°C), larger band-gap, and high voltage breakdown (1200V), fast switching capabilities that can deliver better performances compared to IGBTs for power inverters.


BenefitsSmaller inductors, smaller heat sinks, higher switching frequency than IGBT, smaller capacitors.

TLIMOT THREE LEVEL TNPC STAGE (3L TNPC; T-type Neutral Point Clamped)

is a very efficient inverter configuration. The benefit of 3L TNPC is in its output voltage wave-form while there are no restrictions to the switching scheme as in 3L NPC (especially in emergency shutdown).


BenefitsLow component count, higher efficiency, better fault handling

TLIMOT is a Carrier Board
supporting ZYNQ®-7000 MicroZed and PicoZed SOM. The configuration is ideal as product ready to use for all the markets.


Benefitssmall outline, Industrial Networking (IEC61850, HSR, PRP, EtherCAT, PowerLink, ProfiNet)

TLIMOT RPFM Modulation drives 12 SiC switches allowing extremely low EMI and very low THD.
The power modulator is capable to switch between 2 and 3 Levels on the fly. The SiC high frequency capability is used in combination with the RPFM allowing very effective DC balancing and small DC-Link capacitors.


BenefitsLow EMI, better DC balancing, Industrial Networking (IEC61850, HSR, PRP, EtherCAT, PowerLink, ProfiNet)

TLIMOT 6 Temperature probes can be connected to the carrier to monitor the inverter dissipation.


Benefitstemperature profiling of critical parts, data logging of all temperatures

TLIMOT Hardware-in-the-Loop ZYNQ®-7000 1 Gigabit hardened Ethernet port is used for gateway and control connection toward the National instruments lab-studio graphical user interface, residing in a PC. Lab-view, Matlab, SciLab, Microsoft dot net, C ++, and Visual Basic for applications can also communicate by using this interface allowing investigation and further development.


Benefitsreal-time simulation control, new algorithms, script based control via Ethernet

TLIMOT CONTROL Complete FOC (Field Oriented Control) and SFOC (Sensorless Field Oriented Control) is available in the reference design.


Benefitshardware control (1.6us full Troque Loop), hardware modulator, fast reaction time, Sigma-Delta conversion, Sliding Mode Control.









Hardware Sliding Mode Sensorless Motor Drive - FOC and SFOC


Direct Drive applications can largely benefit from SMC (Sliding mode control).
The sliding mode algorithm is implemented in programmable logic, targeting PMSM (Permanent Magnet Synchronous Motors).
In combination with 3-Level inverter this methodology is used to implement SFOC- Sensorless Field Oriented Control.
Performances of such Sensorless control are extremely good, making possible the Sensorless control almost at 0 speed.


The configuration implements an FMC connector to plug the AVNET ISM-NET daughter card.

With the ISM-NET it is possible to support EtherCAT®, PowerLink, ProfiNET, Ethernet/IP, and all the major industrial networking protocols.




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Application Markets

Market Benefit
Solar Market Lower THD
Automotive Drives Less Weight
Industrial Drives Higher Efficiency



Download a complete presentation of Qdesys 3-LEVELS INVERTER







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