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Type: Posts; User: treez

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  1. Closed: Re: PFC controller datasheets do not tell you that they need to damp LC filter ring

    …thanks, it may well be that, but if it is, then that means it isn’t possible to do a PFC’d Buck converter without getting this ringing…because they will all have LC input filters. There are a...
  2. Closed: Re: Grid tied inverters will result in high mains voltages above 300VAC..do you agre

    Thanks, I actually wonder where the threshold is set for turn OFF of an inverter….i mean, “normal” mains voltage is permitted to go up to 265VAC anyway…that’s 373vpk…..so any inverter would not be...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    woops sorry..here it is
  4. Closed: Re: Grid tied inverters will result in high mains voltages above 300VAC..do you agre

    I believe the overvoltages would be more common over short time ranges of up to 10 milliseconds or so.....because the GTIs would quickly sense the overvoltage and turn off.
  5. Closed: Grid tied inverters will result in high mains voltages above 300VAC..do you agree?

    When a grid tied inverter (from a solar fed battery) is connected to the mains, it senses the mains voltage and disconnects if the mains voltage goes above 250VAC in UK (above 240VAC in Europe)....
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    Closed: Re: convert voltage control to current control

    Please read the attached
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    here is some help with layout, which you also requested
  8. Closed: PFC controller datasheets do not tell you that they need to damp LC filter ringing?

    Hi
    Why is it that PFC controller datasheets don’t tell you that they all have a facility to damp the LC filter ringing near the mains zero crossing?
    The PFC controllers all do this because PFC...
  9. Closed: Flyback SMPS constant off time controller with PIC micro?

    Hi,
    We wish to program the PIC16F176X micro to be a constant off time controller for a Current mode Flyback SMPS.
    Please could you say if this is possible?

    All we wish to do is set up its...
  10. Closed: Re: Opamp buffer with 400nF output capacitance going unstable?

    Thanks, yes I believe there is a real threat of instability here. Please could you check if the following would be unstable? (schematic attached) I have used “out of loop compensation”, as given on...
  11. Closed: Re: Opamp buffer with 400nF output capacitance going unstable?

    Just to note, I’ve just actually wired in 51.7uF of capacitance in parallel with C2, and its still not gone unstable. (11 pieces of 4u7, 0805, 16v, X7R).

    - - - Updated - - -

    Also, I’ve then...
  12. Closed: Re: Opamp buffer with 400nF output capacitance going unstable?

    Thanks, I will read about “in loop compensation” etc, it sounds good.
    Today I actually addressed our contractor, and tried to talk him out of the circuit of the top post. However, also, I actually...
  13. Closed: Re: Opamp buffer with 400nF output capacitance going unstable?

    Thanks, actually there is some requirement for the opamp to sink current some of the time. 15mA was just an average figure.
    What would you say is the maximum capacitive load allowable for an opamp...
  14. Closed: Opamp buffer with 400nF output capacitance going unstable?

    Hi
    We wish to have this 8V3 Regulator. (attached)
    Do you think the amount of output capacitance will make the MIC6211 opamp go unstable?
    MIC6211 opamp...
  15. Closed: Re: Regulating temperature of mains connected heating element: Skipping mains half cy

    Thanks, yes you are right, controlling temperature by controlling the flow rate appears to be the main method....but it is a poor method....just cheaper....

    What I would add is, that I have lived...
  16. Closed: Do you know the efficiency vs output load for this dcdc module?

    https://www.cui.com/product/resource/pds1-m.pdf

    ..the datasheet doesnt say. It only says "up to 82%"

    Its the PDS1-S12-D15-M one


    *..................................
    Also this one doesnt...
  17. Closed: Re: Regulating temperature of mains connected heating element: Skipping mains half cy

    Having re-looked at the shower of post #21, I now agree with your words. It’s the flow rate that is being adjusted to give a wide range of temperature outputs.
    However, there is a very big problem...
  18. Closed: Re: Regulating temperature of mains connected heating element: Skipping mains half cy

    Thanks, I also read the manual.
    There are three flow settings. Then there’s the temperature dial for you to increase/decrease temperature with whatever flow setting. The temperature scale has fine...
  19. Closed: Re: Regulating temperature of mains connected heating element: Skipping mains half cy

    sorry Betwixt, i should have made clear that i am only speaking of "electric showers" here.....you are kindly referring to whats known in shower company marketing departments as a "digital shower"....
  20. Closed: Re: Regulating temperature of mains connected heating element: Skipping mains half cy

    Interestingly, The following electric shower..
    https://www.mirashowers.co.uk/showers/electric-showers/mira-decor-dual-108kw/
    ..has an extremely fine resolution in its temperature setting, so it...
  21. Closed: Re: PIC1F1508 with four PWM outputs operating at different frequency?

    Thanks, oh no, we need some to be slower than others, thats why i was hoping that one of the pwm streams can have like a software flip flop put with it to make it say half the frequency
  22. Closed: PIC1F1508 with four PWM outputs operating at different frequency?

    Page 252 of the PIC16F1508 datasheet suggests that the four PWM outputs of the PIC16F1508 must all be the same frequency.
    However, is their some way that this can be changed?…eg one of the outputs...
  23. Closed: Re: Mains harmonic emissions for dimmable offline LED drivers.

    Thanks i see what you mean and agree.
    This does appear to be a mistake in the regulations though.......i mean, the customer may only need 25W at a certain time, but would have to use 50W...wasting...
  24. Closed: Re: Mains harmonic emissions for dimmable offline LED drivers.

    As discussed, the Class C regulations require conformance all the way down to 25W. However, as I have remarked, its not economically feasible to produce an offline SMPS LED driver of power >100W...
  25. Closed: Re: Mains harmonic emissions for dimmable offline LED drivers.

    OK thanks, ill look into adapting it for opto-isolated feedback.
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