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Recent content by mitz

  1. M

    AC - AC Buck converter for Inductive load

    Could anyone please provide a working schematic for 220v AC - AC Buck converter for Inductive load? A circuit which runs the motor without PWM noise is preferred. Thanks.
  2. M

    AC Phase Control

    Does AC phase control creates 'hum' sound in AC Fan?
  3. M

    AC Frequency conversion in SMPS

    @ ashugtiwari. Thank you very much for the excellent reply.
  4. M

    MOSFET heats during low pulse width in SMPS

    https://www.falstad.com/circuit/#%24+1+5.0E-6+23.47059216675035+51+5.0+50%0Ar+160+272+80+272+0+10000.0%0At+160+272+208+272+0+1+0.5628227334851401+0.6412403660766932+100.0%0Ar+208+320+80+320+0+10000.0%0Aw+80+272+80+320+0%0Ag+208+432+208+480+0%0Ar+256+256+256+160+0+1000.0%0At+432+256+496+256+0+-1+-...
  5. M

    AC Frequency conversion in SMPS

    @phobos1. I'm yet to find the answer. Bit busy with work. You can check this link. Has many useful topics including smps. https://tahmidmc.blogspot.in/p/blog-page.html
  6. M

    AC Frequency conversion in SMPS

    How is High frequency AC (in KHz / MHz) is converted to 50Hz AC in UPS or SMPS? What role does the toroid inductor do in UPS? Am I right that the SMPS converts DC to HF AC then to 50Hz AC? Thanks.
  7. M

    Current limit with constant voltage

    This link would be useful. https://www.tpub.com/neets/book7/27l.htm
  8. M

    [SOLVED] Buck converter frequency correction

    @BradTheRad. Thank you very much for all help. Good day.
  9. M

    [SOLVED] Buck converter frequency correction

    @BradTheRad. Thanks a lot for spending your valuable time helping me immensly. I tried with just 4 turns on a small hand wound inductor and got good results with frequencies above audible range. Does not a very tight wound coil oscillate? These days even if I think of the "Ziing" noise I 'hear'...
  10. M

    [SOLVED] Buck converter frequency correction

    @BradTheRad. Thank you very much for the advice. A hand wound inductor with just 4 turns is almost working with 40KHz. Still there is little HF noise. Does a bigger capasitor like 2200uF, 63V in the output have effect of voltage regulation? Any help would be very much appreciated. Also pls...
  11. M

    [SOLVED] Buck converter frequency correction

    In this buck converter, Voltage reduces with increase in frequency. PWM 1 kHz, DUTY CYCLE 50% - Voltage around 11.5V PWM 10 kHz, DUTY CYCLE 50% - Voltage around 5V PWM is generated with Arduino using tone method (square wave) The inductor is toroid type, taken from a 600VA APC UPS. Of the 4...
  12. M

    adc interference

    Blocking HF interference DC-motors without filters and other devices containing large coils can generate strong high frequency signals. Those can potentially interfere with the LCD display electronics. The result can be funny characters on the display. The microcontroller itself is not so...
  13. M

    circuit that can drive a AC loaded machine..

    @swathi: Hope part of the schematic from the attached file "Capasitor ceiling fan controller" might be of help. But this uses Triac instead of MOSFET
  14. M

    circuit that can drive a AC loaded machine..

    @ Swathi: These values were given by Tahmid. R1 should be between 1k and 5k. I recommend 1k or 2.2k for R2. Hope you suceed agent Bond in his mission.
  15. M

    [SOLVED] Motor control by varying voltage instead of PWM

    @ Zapper : Thank you very much. I am too having similar thought but the life of these capacitors seems short as they fail in an year or two with those found in ceiling fan regulators.
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