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Some Guy
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Only 6-IGBT HVDC converter?
Some Guy   5/2/2014 12:18:43 PM
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IGBTs with 3,000+ Volt breakdown specs is revolutionizing the switchover to HVDC. The previous economic breakeven was for a 600 km (360 mi) distance. The US Department of Energy is actively pursuing dropping that to 300 km (180 mi). AC transmission is done in ~70 mi (112 km) segments, at least in North America. Once HVDC cost gets low enough to be competitive at that distance, it will hit a tipping point and become a no-brainer. With about 5 years of transmission-planning backlog and a 30-year design life, it will probably be 2050 before we see the migration mostly accomplished. Of course in the mean time the entire load base, driven by power semiconductors, is natively DC already. One hundred years from now we'll probably chuckle that we ever used AC.

Finally, my understanding is that no one is still using 6 device conversion as shown above and that 12 device is probably the minimum.

 



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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