If you have an imaginary number, then your voltage is too low for the system to work.
From: Forrest Christian (List Account) Sent: Friday, March 10, 2017 8:21 PM To: af Subject: Re: [AFMUG] Raw Data So here's where my formula breaks down: If Vin^2 < 4*Pload*Rcable, then you end up with a negative number you need to take a square root of.... Somehow I don't think an imaginary number is what we're looking for. I wonder if for instance solving for the total current might solve this problem, then you could use the current to determine the voltage drop. I haven't even started to look at whether this is any simpler or ends up with a non-contiguous function or not. On Fri, Mar 10, 2017 at 8:46 PM, Chuck McCown <[email protected]> wrote: I think you would agree, this is not as simple as it first appears.... From: Forrest Christian (List Account) Sent: Friday, March 10, 2017 7:43 PM To: af Subject: Re: [AFMUG] Raw Data Calculated values, from 16 to 24, using 6.24 as the power, 8 ohms, and 16 through 24 volts in. This is using my formula: 11.75233261 13.22546294 14.57494395 15.85059052 17.07672241 18.26723889 19.43089556 20.57358804 21.69948452 (SQRT(Vin*Vin-4*Pload*Rcable)+Vin)/2 On Fri, Mar 10, 2017 at 6:45 PM, <[email protected]> wrote: This is an SM with and without an 8 ohm series resistance. This data was after boot up. I came down from 24 volts when testing with the 8 ohm because it will not boot with the resistor until you get up to about 18 volts due to high current during booting. Voltage Current Power 8 ohm I 8 Ohm Load V 11 0.56 6.16 12 0.52 6.24 13 0.48 6.24 14 0.45 6.3 15 0.4 6 16 0.39 6.24 0.56 11.52 17 0.35 5.95 0.47 13.24 18 0.34 6.12 0.43 14.56 19 0.32 6.08 0.38 15.96 20 0.3 6 0.35 17.2 21 0.28 5.88 0.33 18.36 22 0.28 6.16 0.31 19.52 23 0.27 6.21 0.3 20.6 24 0.26 6.24 0.28 21.76 Am late for a company dinner celebrating the 10 anniversary of one of our employees. So will analyze tomorrow to see if it matches my quadratic equation. -- Forrest Christian CEO, PacketFlux Technologies, Inc. Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 [email protected] | http://www.packetflux.com -- Forrest Christian CEO, PacketFlux Technologies, Inc. Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 [email protected] | http://www.packetflux.com
