Algorithm and voltage monitoring
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From: john1987 on 26 Jul 2010 21:13 It worked for me too. Thanks John
From: Grant on 26 Jul 2010 22:37 On Mon, 26 Jul 2010 20:38:55 -0400, "Martin Riddle" <martin_rid(a)verizon.net> wrote: > > >"Tim Wescott" <tim(a)seemywebsite.com> wrote in message >news:iJKdnWYsC-kvudPRnZ2dnUVZ_i2dnZ2d(a)web-ster.com... >> On 07/26/2010 02:37 PM, john1987 wrote: >>> Hi, >>> >>> I am monitoring the voltage across the resistor and needs to maintain >>> it steady at set point value. Let? 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 ?f >>> else?statements to see whether the voltage is right and make >>> adjustments accordingly. >>> >>> >>> My question is >>> >>> Is this algorithm of using ?f else?algorithm is enough or should I >>> be controlling the voltage using like control algorithm like PID >>> controller etc. >> >> Depending on what "make adjustments accordingly" translates to, you're >> working on something that might work. >> >> Do a PID, get it right, and you'll be working on something that _will_ >> work. Assuming, of course, that all the rest of the system is >> right -- >> but if the rest of the system is screwed up, then some oddball hybrid >> bang-bang controller is going to have less of a chance at it than even >> a simple PID controller. >> >> While it lasts: dpm1480.pbworks.com/f/PID%20without%20a%20PhD.pdf. >> >> eetimes.com has moved things around; they've put all the interesting >> stuff behind an email harvester. Dang!! >> > >Nope, dead link ;( >and not even a half hour. Just worked for me. Email me and I'll forward it. Grant. > >Cheers > >
From: ehsjr on 26 Jul 2010 22:44 Tim Wescott wrote: > On 07/26/2010 02:37 PM, john1987 wrote: > >> Hi, >> >> I am monitoring the voltage across the resistor and needs to maintain >> it steady at set point value. Let�s 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. > > > Depending on what "make adjustments accordingly" translates to, you're > working on something that might work. > > Do a PID, get it right, and you'll be working on something that _will_ > work. Assuming, of course, that all the rest of the system is right -- > but if the rest of the system is screwed up, then some oddball hybrid > bang-bang controller is going to have less of a chance at it than even a > simple PID controller. > > While it lasts: dpm1480.pbworks.com/f/PID%20without%20a%20PhD.pdf. > > eetimes.com has moved things around; they've put all the interesting > stuff behind an email harvester. Dang!! > Nice article. Repeating your link: http://dpm1480.pbworks.com/f/PID%20without%20a%20PhD.pdf Ed
From: Richard Henry on 26 Jul 2010 22:51 On Jul 26, 3:03 pm, john1987 <conphil...(a)hotmail.com> wrote: > 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 wanted to know what controls you had over the power you are controlling - how many, how attached to the power source and the device under control, discrete or analog ocntrols, etc.
From: john1987 on 26 Jul 2010 23:34
Hi, I am controlling the power via H bridge 4081A and four mosfets. Basically controlling the current via PWM using micro. John |