Algorithm and voltage monitoring
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From: john1987 on 26 Jul 2010 17:37 Hi, I am monitoring the voltage across the resistor and needs to maintain it steady at set point value. Lets suppose if the set point value is 100 volts peak to peak and if the voltage goes below this value or above this value than I have to make MOSFETS turn ON and OFF using pulse width modulation to keep the voltage steady. Right now, I am reading the voltage across the coil and doing if else statements to see whether the voltage is right and make adjustments accordingly. My question is Is this algorithm of using if else algorithm is enough or should I be controlling the voltage using like control algorithm like PID controller etc. Regards, john
From: Richard Henry on 26 Jul 2010 17:54 On Jul 26, 2:37 pm, john1987 <conphil...(a)hotmail.com> wrote: > Hi, > > I am monitoring the voltage across the resistor and needs to maintain > it steady at set point value. Lets suppose if the set point value is > 100 volts peak to peak and if the voltage goes below this value or > above this value than I have to make MOSFETS turn ON and OFF using > pulse width modulation to keep the voltage steady. > > Right now, I am reading the voltage across the coil and doing if > else statements to see whether the voltage is right and make > adjustments accordingly. > > My question is > > Is this algorithm of using if else algorithm is enough or should I > be controlling the voltage using like control algorithm like PID > controller etc. > > Regards, > > john What capability does you hardware have?
From: john1987 on 26 Jul 2010 18:03 Hi, The microprocessor has an 12 BIT, 400Ksps ADC and four I/O ports available. It's clock is 50MHz. Is that what you wanted to know. Please let me know. Thanks John
From: Martin Riddle on 26 Jul 2010 19:17 "john1987" <conphiloso(a)hotmail.com> wrote in message news:f95370aa-11a6-4567-a611-5099900bd5e0(a)i31g2000yqm.googlegroups.com... > Hi, > > The microprocessor has an 12 BIT, 400Ksps ADC and four I/O ports > available. It's clock is 50MHz. Is that what you wanted to know. > Please let me know. > > > Thanks > John > I did a PID in a cygnal 8051 micro once, It can work. You'll have to figure out what bandwidth you need. Your probably looking at a 2-3 kHz of bandwidth that the PID can work in with a 50 mhz core clock. Get a book on PID algorithms. Cheers
From: john1987 on 26 Jul 2010 19:37
Hi, I guessed that I should have asked this question in the beginning that what advantage the PID would have over just if else implementation? John |