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Type: Posts; User: mohsenruz

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  1. Replies
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    253

    Closed: Re: Eurotherm 2604 master password required

    you are right
    it seems it was a problem with my internet service provider.
    now it is okay
    thanks for your answer
  2. Replies
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    253

    Closed: Eurotherm 2604 master password required

    Hi

    Does anyone have "master password" required to download docs from Eurotherm website. furthermore any advise in working with Eurotherm 2604 will be acknowledged.

    Thanks
  3. Closed: mma7260

    I have not work with MMA7260 , but I think you should measure the bias value and subtract it from the result.
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    15,639

    Closed: ultrasonic humidifier circuit

    I suggest you to check the website of apexmicrotech which is a producer of transducer drivers. for example pa241 and pa98 are two candidates.

    www.apexmicrotech.com
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    1,421

    Closed: Re: help me to write program matlab problem

    for fix value of all the parameters except v you may calculate Cp and λ for different value of v. for this purpose you can diffine v as a vector with your specific values. then calculate Cp and λ...
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    Closed: concept of effective mass

    Holes are virtual consept to simplify our model of phenomena. we can say holes are the virtual particles that carry the positive current.
  7. Replies
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    2,157

    Closed: Re: how do we model non linear systems

    Mathematically every system can be modeled linear or nonlinear. for nonlinear systems the relation between output and input or output and states are not linear. there are several way to simplify the...
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    1,915

    Closed: Re: switching made power supply

    To design and build a new power supply with this specification is easier than to change a pc power supply for your purpose. as you know pc supplies are constant power supplies and there is no unique...
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    Closed: Re: Very strange during simulating loop-gain

    High loop gain by itself is not the condition of oscilation, dont forget that the overal system transfer function is equal to A/(1+AB), so when AB>>1 we can say that overall system transfer function...
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    Closed: Re: Vector control theory?

    you can see this article

    https://www.edaboard.com/viewtopic.php?p=405774#405774
  11. Closed: Re: Sampling Time

    If your sampling freq is 1Mhz, so your sampling time is 1e-6, you should use zero order hold after your continuoes signal and then your discrte time integrator.

    for example I have simulated...
  12. Closed: Re: Sampling Time

    you should use zero order hold to discretize your system, therefore the sampling time introduce in the transfer function of your system, for an integrator the discretized system with zero order hold...
  13. Closed: Re: Zeros in FIR filter

    zero on the unit circle means your system (filter) will cancel out any signal with that frequency completly . because the transfer function of filter at that frequency is zero.
    the zeros outside...
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    Closed: Re: DC MOTOR RPM CONTROL

    Hi

    I am not sure that your system can work with fast command change, as the other friend mentioned, the problem of aliasing is the first problem of your system. the second one there is no any...
  15. Closed: pwm dc dc chopper

    In a dc-dc converter, there is a fixed and not very regulated voltage (say the rectifier voltage) in one side, on the other side we want to have a regulated and variable dc voltage which for example...
  16. Closed: Re: Statespace conversion to transfer func. for boost conver

    switching converters esentially are nonlinear and time-varying circuits. so you need linearization about the dc value to decrease the problem to the linear case, and secondly to average the states...
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    Closed: Re: Any document of switching power Design

    from practical point of view, the book of pressman is the best.


    Switching Power Supply Design
    by Abraham I. Pressman

    http://www.amazon.com/exec/obidos/ASIN/0070522367/102-1954873-1167360
    ...
  18. Closed: Re: who can tell me the solution "the fundamental of po

    Did you mean the solution manual of the book "Fundamental of power electronics"?

    you can find the solution of selected problem and some related material
    in the site of author
    ...
  19. Closed: Re: Transient analysis with two independent sources

    I prefer Saber. It is faster than spice. however I am not sure about RF simulation with saber.
  20. Closed: Re: What is the difference between voltage and current feedb

    when you want to control the current you should use current feedback because your refernce also is a current.
    it is depend to the circuit and control strategy to choose one of these methods;...
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    Closed: lm324 vs lm339

    LM324 has wider bandwidth (1MHz). if u want to use it in an ordinary app, LM339 is quite good choice. sometimes to use faster comparator need more task for stabilization.

    application note AN-74...
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