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green_is_now
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re: MIT power management spin-off raises funds
green_is_now   1/18/2013 6:42:44 PM
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yes cradle to grave. agree misleading, as if they could effect the lossws in a power plant. The world is so used to BSin and being BS'd that nobody thinks a seond thought about it... Except engineers.

green_is_now
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re: MIT power management spin-off raises funds
green_is_now   1/18/2013 4:48:13 PM
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0.5(ower plant efficiency aprox)*0.8*0.8*0.8 ~=0.2 must include the fuel to elctricity converion loss also.

Simon7382
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re: MIT power management spin-off raises funds
Simon7382   1/18/2013 7:33:38 AM
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Well, this depends on how broadly they meant it. For example if you include incandescent lighting where most of the energy used is wasted as heat instead of the targeted light, or if you include the energy efficiency of all automobiles, etc., then it might be theoretically OK. But, of course, it has nothing whatsoever to do with the topic at hand, i.e. DC/DC power conversion and its efficiency. Hence, for sure it is marketing hubris.

chanj0
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re: MIT power management spin-off raises funds
chanj0   1/14/2013 11:26:49 PM
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Switch mode power supply is known to be high efficiency. As far as I understand DC-DC convertor has efficiency as high as 98%. I guess the 80% means more than power conversion at home and for the devices. It might cover everything end-to-end including through the grid and step down conversion to either 220VAC or 110VAC. 80% still sounds high to me. Love to hear expert from electric company.

krisi
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re: MIT power management spin-off raises funds
krisi   1/14/2013 6:27:14 PM
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"A staggering 80 percent of energy generated worldwide is lost as heat due to power-conversion losses"??? This can't be true



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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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