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Type: Posts; User: ljille

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  1. Closed: Re: Sine PWM calculated with pic, instead of using table

    Yes, it generates a sinuidal pulse train, but this needs an LC filter yet, not specifyed here, who convert that pulse train in a smooth pure sine wave signal simmilar to the commercial signal. It...
  2. Closed: Re: Sine PWM calculated with pic, instead of using table

    'This is a version for Sinus wave inverter with hardware PWM module
    ' in uController
    'It alternates pins, each one responsible of a branch on a H bridge
    'half positive cycle on 96 program cycles...
  3. Closed: Re: Sine PWM calculated with pic, instead of using table

    This squema I think can clarify what I am trying to do. I was trying to avoid the logical gates after the PIC, but as I have only one PWM port... The other factor is that I have already a printed...
  4. Closed: Re: Sine PWM calculated with pic, instead of using table

    Yes, the HPWM instruction of PicBasic uses the PWM hardware. I ommited this because I wanted to use two branches (so two pins), one for each branch, but this uController has only one PWM port RB3,...
  5. Closed: Re: Sine PWM calculated with pic, instead of using table

    Well, considering comments, What do you think of this version of program for inverter?:

    'This is a version for Sinus wave inverter without PWM or HPWM instructions
    'It alternates pins, each one...
  6. Closed: Re: Sine PWM calculated with pic, instead of using table

    I was in a confusion: PWM is different than HPWM. PWM is a very slow software based picbasic instruction. HPWM is a pcbasic instruction that handles the hardware based PWM for PICs with this...
  7. Closed: Re: Sine PWM calculated with pic, instead of using table

    The advantage I saw of using PWM function would be not to deal with measuring time and its interruptions.
    * Is there a picbasic document who gives us the time of execution of each instruction in...
  8. Closed: Re: Sine PWM calculated with pic, instead of using table

    >
    16F628A has 128 EEPROM bytes, so I'd have to handle 1/4 of sine cycle and decrement pointer to handle about 100 data table. So it is possible but some tricky, and maybe I liked how short is this...
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    Closed: Re: Sinusoidal PWM Control for PMSM Motor

    see my post "Sine PWM calculating instead of table" or something like that, I don't know exactly if this works but it seem it does. I'm waiting a guru answer. You would have to add a factor in the...
  10. Closed: Sine PWM calculated with pic, instead of using table

    I have seen several posts about PWM in order to make a one phase inverter,

    and most use a long values table calculated to get the sine wave,

    154902

    but what if it calculates the duty value...
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    Closed: Interfacing LM311 and TTL

    This could seem basic, but I have trouble with an LM311 and TTL, please see ‘LM311_y_Shmitt.png’ to see diagram
    With a LM311 comparator I’ve got a squared signal from a ICL8038 sinus signal, the...
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    Closed: Re: IGBTs burned by an unkonwn bad spirit

    Now another thing. I'm securing that the control circuit doesn't emit for any reason a short circuit state. Then next question is if IGBTs gate support to be feeded directly by a CMOS gate who emit...
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    Closed: Re: IGBTs burned by an unkonwn bad spirit

    This time, the forum didn't replaced school but replaced the teacher to which one ask. I studied phisics and digital machines: logic gates, carnaugh maps, microprocessors, programming, but respect...
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    Closed: Re: IGBTs burned by an unkonwn bad spirit

    FvM: Thank you very much. I'm in debt with you and the forum, because with this fault I would have burned several other IGBTs.
    I rated the IGBTs for its current, 70 amps for a max peak load of 30...
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    Closed: IGBTs burned by an unkonwn bad spirit

    I'm trying to do an inverter based on Sine Pulse Width Modulation (SPWM). I did two stages, control and power. The first, done with AmpOp 741 and comparators LM311 generates 4 signals wich would be...
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    Closed: Re: Selecting a capacitor for a bigger voltage

    Thank you. It is not going to be connected to 500 V, the question is if one can use a 500 V rated cap where the voltage is just 5 V, and the 2.2 nF will remain being the same capacitance specified. ...
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    Closed: Re: Selecting a capacitor for a bigger voltage

    In other words: what happen if I have already and use a capacitor rated at 1nF, 500 V, instead of the 1nF 50 V. I supposedly should use, and I use it in a 12 V op amp circuit wich is adding two...
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    Closed: Re: Selecting a capacitor for a bigger voltage

    Voltage will affect as it is the 'strenght' of electrons to be moved, but it is not the question (I don't explained myself enough), who is, if the exagerated difference in the rate of a capacitor...
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    Closed: Selecting a capacitor for a bigger voltage

    Several times I and I think a lot of people have used a capacitor rated for 50 V when the specification is 25 V. But if you have a 500 V rated capacitor, for instance 2.2 nF, for a circuit of 5 or...
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    Closed: Changing package in proteus

    I designed and simulated a circuit with proteus 8, I passed to Ares and the circuit looks good but I made a mistake: I used surface mounting resistors and I don't know how to handle this in the real...
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    Closed: Re: Converting voltage to resistance

    As I told previously, and trying to be grateful I want to share the idea of a digipot who could be used in different scenarios, adjusting input and output to different ranges.

    It selects a digit...
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    Closed: Re: Converting voltage to resistance

    Excuse me, I've got confused, I'm sending the right squematic. Certainly the voltages in the moc are now right.

    - - - Updated - - -

    I suppose you can see the simulation, it looks right.
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    Closed: Re: Converting voltage to resistance

    I did the changes you sugested and then the proteus became emotional so didn't simulate under the claim of " excesive processor load", although the windows monitor doesn't goes up 22%. Then I...
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    Closed: Re: Converting voltage to resistance

    Thank you very much. I'll make the changes listed and will simulate and send the circuit back, but first I'll do some previous tasks.
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    Closed: Re: Converting voltage to resistance

    Hello, here again.
    Although I will post later the circuit with the digipot with basic components that I was doing, the circuit attached, wich I found in another site posted by Lazaridis, seem to...
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