Recent content by Anfo

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    Oven controller block diagram, transfer function and temperature calcs

    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.
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    Oven controller block diagram, transfer function and temperature calcs

    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?
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    Oven controller block diagram, transfer function and temperature calcs

    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...
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    Oven controller block diagram, transfer function and temperature calcs

    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)...
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    Oven controller block diagram, transfer function and temperature calcs

    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!
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    Oven controller block diagram, transfer function and temperature calcs

    I am new to this subject and a bit confused as to where the output will sit. Is that Ko?
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    Oven controller block diagram, transfer function and temperature calcs

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    Oven controller block diagram, transfer function and temperature calcs

    Also, I'm a bit confused as to where K2 will be. The power amp is K1 and the oven is Ko?
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    Oven controller block diagram, transfer function and temperature calcs

    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...
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