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Efficiency and maximum power transfer
Owen Duffy wrote in
: .... voltage. Efficiency is OutputPower/InputPower. By varying the grid bias, drive voltage, load impedance and supply voltage for a given triode, different efficiencies will be found, and the maximum could be well over 80%. If you want to explore this approach to design, I have implemented a spreadsheet which in turn implements the methods described in CPI/Eimac's "Care and Feeding of Power Tubes" it is described and can be downloaded at http://www.vk1od.net/RFPATPC/index.htm . The spreadsheet is populated with the example 4CX20000 in Class C from the above publication. The spreadsheet calculates the anode current wave form from an interpolation based on a number of points from the published characteristics, and calculates the fundamental component of anode current using an FFT. It then calculates anode efficiency and overall efficiency given operating parameters. Owen |
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