Recent content by Anfo

It makes total sense now! Actually so simple really but if you don't know then you don't know. Brilliant, thanks so much. I will play with this now and see what results I get for the oven temperature.

This is the bit where I got stuck. E is again on the right because To = ko * I and I = E * k1 Maybe I'm taking the substitution level too far?

From this: E = Vd - Vm but Vm = k2 x Vt so E = Vd - (k2 * Vt) but Vt = kt * To so E = Vd -(k2 * kt * To) I have substituted further to: To = ko * I so E = Vd - (k2 * kt * ko * I) and I = E * k1 so final transfer function is E = Vd - (k2 * kt * ko * E * k1) I have worked out E to be = 1 and I...

I see what you mean, so I would need to add another block in the feedback path for the thermocouple. The small signal will then be amplified by the voltage amplifier. I have started to put the transfer function together but am a bit unsure. E = Vd - Vm but Vm = k2 x Vt so E = Vd - (k2 * Vt)...

Needless to say I need to get this part right to be able to work out the transfer function expression. Apologies if a stupid question but any help or guidance will be much appreciated!

I am new to this subject and a bit confused as to where the output will sit. Is that Ko?

Also, I'm a bit confused as to where K2 will be. The power amp is K1 and the oven is Ko?

FIGURE 5 shows an electrically heated oven and its associated control circuitry. The current, I, to the oven's heating element is fed from a voltage-controlled power amplifier such that I = EK1. A voltage, VD, derived from a potentiometer, sets the desired oven temperature, TD. The oven...