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sharpie7 / circuitjs1

Electronic Circuit Simulator in the Browser
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In the startIteration() method in the LampElm class, how are these formulas and parameters obtained? #855

Open 306Vulcan opened 1 year ago

306Vulcan commented 1 year ago

In the startIteration() method in the LampElm class, how are these formulas and parameters obtained? void startIteration() { // based on http://www.intusoft.com/nlpdf/nl11.pdf double nom_r = nom_v*nom_v/nom_pow; // this formula doesn't work for values over 5390 double tp = (temp > 5390) ? 5390 : temp; resistance = nom_r*(1.26104 - 4.90662*Math.sqrt(17.1839/tp - 0.00318794) - 7.8569/(tp - 187.56)); double cap = 1.57e-4*nom_pow; double capw = cap * warmTime/.4; double capc = cap * coolTime/.4; //System.out.println(nom_r + " " + (resistance/nom_r)); temp += getPower()*sim.timeStep/capw; double cr = 2600/nom_pow; temp -= sim.timeStep*(temp-roomTemp)/(capc*cr); // sim.console("lampsi " + temp + " " + capc + " " + nom_pow); }

306Vulcan commented 1 year ago

can you help me

billcollis commented 1 year ago

looks like it could be similar to a thermistor

306Vulcan commented 1 year ago

looks like it could be similar to a thermistor

Hello, do you have any reference materials?

billcollis commented 1 year ago

maybe try this? https://www.eevblog.com/forum/projects/electrical-model-for-incandescent-lamp/ or search for PTC thermistor graph/model