Glitch in AC sine wave interfering with phase cut dimming





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My company installs ZigBee-based phase cut dimmers for bulbs and LEDs (those which support phase cut dimming). Recently, we encountered a site where we faced a flicker issue. The light is slightly flickering. When the same set of LED driver + LED is being tested at our test lab, everything is working fine. This issue seems very site specific.



Site details - Some active construction is still happening at the site. Machinery like stone cutters, drill machines are being used on a continuous basis. It's also possible that the site is being powered by a generator set and not connected to grid at all (I am not sure of this part yet).



Here is the site waveform:



Site AC



I noticed a repetitive glitch in the AC waveform which could be a reason behind the flicker issue.



AC waveform as seen at our test lab:



Lab AC



This one looks different from the site waveform.



What is causing this distortion at the site? Is there a way I can correct it so that dimmers don't cause any flicker?










share|improve this question











$endgroup$










  • 2




    $begingroup$
    Can you put an LDR or photodiode on channel 2 to see when the light triggers? I think you can use an LED as a photodiode if you're stuck. Check the web. (It's hard to be original these days.)
    $endgroup$
    – Transistor
    May 27 at 22:08










  • $begingroup$
    I'll try it out. Alternatively I can hook up the second channel to LED driver output and monitor the waveforms.
    $endgroup$
    – Whiskeyjack
    May 28 at 3:13






  • 3




    $begingroup$
    If you think those ripples are bad, check this guy who noticed that his utility company injects 9% 1 kHz ripple on purpose.
    $endgroup$
    – pipe
    May 28 at 8:03










  • $begingroup$
    I am hoping that different ICs in led drivers will have different response to this glitch. I am planning to test a different matching LED driver. I will post an update once I find something.
    $endgroup$
    – Whiskeyjack
    May 28 at 10:07


















7












$begingroup$


My company installs ZigBee-based phase cut dimmers for bulbs and LEDs (those which support phase cut dimming). Recently, we encountered a site where we faced a flicker issue. The light is slightly flickering. When the same set of LED driver + LED is being tested at our test lab, everything is working fine. This issue seems very site specific.



Site details - Some active construction is still happening at the site. Machinery like stone cutters, drill machines are being used on a continuous basis. It's also possible that the site is being powered by a generator set and not connected to grid at all (I am not sure of this part yet).



Here is the site waveform:



Site AC



I noticed a repetitive glitch in the AC waveform which could be a reason behind the flicker issue.



AC waveform as seen at our test lab:



Lab AC



This one looks different from the site waveform.



What is causing this distortion at the site? Is there a way I can correct it so that dimmers don't cause any flicker?










share|improve this question











$endgroup$










  • 2




    $begingroup$
    Can you put an LDR or photodiode on channel 2 to see when the light triggers? I think you can use an LED as a photodiode if you're stuck. Check the web. (It's hard to be original these days.)
    $endgroup$
    – Transistor
    May 27 at 22:08










  • $begingroup$
    I'll try it out. Alternatively I can hook up the second channel to LED driver output and monitor the waveforms.
    $endgroup$
    – Whiskeyjack
    May 28 at 3:13






  • 3




    $begingroup$
    If you think those ripples are bad, check this guy who noticed that his utility company injects 9% 1 kHz ripple on purpose.
    $endgroup$
    – pipe
    May 28 at 8:03










  • $begingroup$
    I am hoping that different ICs in led drivers will have different response to this glitch. I am planning to test a different matching LED driver. I will post an update once I find something.
    $endgroup$
    – Whiskeyjack
    May 28 at 10:07














7












7








7





$begingroup$


My company installs ZigBee-based phase cut dimmers for bulbs and LEDs (those which support phase cut dimming). Recently, we encountered a site where we faced a flicker issue. The light is slightly flickering. When the same set of LED driver + LED is being tested at our test lab, everything is working fine. This issue seems very site specific.



Site details - Some active construction is still happening at the site. Machinery like stone cutters, drill machines are being used on a continuous basis. It's also possible that the site is being powered by a generator set and not connected to grid at all (I am not sure of this part yet).



Here is the site waveform:



Site AC



I noticed a repetitive glitch in the AC waveform which could be a reason behind the flicker issue.



AC waveform as seen at our test lab:



Lab AC



This one looks different from the site waveform.



What is causing this distortion at the site? Is there a way I can correct it so that dimmers don't cause any flicker?










share|improve this question











$endgroup$




My company installs ZigBee-based phase cut dimmers for bulbs and LEDs (those which support phase cut dimming). Recently, we encountered a site where we faced a flicker issue. The light is slightly flickering. When the same set of LED driver + LED is being tested at our test lab, everything is working fine. This issue seems very site specific.



Site details - Some active construction is still happening at the site. Machinery like stone cutters, drill machines are being used on a continuous basis. It's also possible that the site is being powered by a generator set and not connected to grid at all (I am not sure of this part yet).



Here is the site waveform:



Site AC



I noticed a repetitive glitch in the AC waveform which could be a reason behind the flicker issue.



AC waveform as seen at our test lab:



Lab AC



This one looks different from the site waveform.



What is causing this distortion at the site? Is there a way I can correct it so that dimmers don't cause any flicker?







ac sine dimming






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited May 27 at 20:52









Peter Mortensen

1,5953 gold badges14 silver badges22 bronze badges




1,5953 gold badges14 silver badges22 bronze badges










asked May 27 at 9:38









WhiskeyjackWhiskeyjack

4,7692 gold badges26 silver badges70 bronze badges




4,7692 gold badges26 silver badges70 bronze badges











  • 2




    $begingroup$
    Can you put an LDR or photodiode on channel 2 to see when the light triggers? I think you can use an LED as a photodiode if you're stuck. Check the web. (It's hard to be original these days.)
    $endgroup$
    – Transistor
    May 27 at 22:08










  • $begingroup$
    I'll try it out. Alternatively I can hook up the second channel to LED driver output and monitor the waveforms.
    $endgroup$
    – Whiskeyjack
    May 28 at 3:13






  • 3




    $begingroup$
    If you think those ripples are bad, check this guy who noticed that his utility company injects 9% 1 kHz ripple on purpose.
    $endgroup$
    – pipe
    May 28 at 8:03










  • $begingroup$
    I am hoping that different ICs in led drivers will have different response to this glitch. I am planning to test a different matching LED driver. I will post an update once I find something.
    $endgroup$
    – Whiskeyjack
    May 28 at 10:07














  • 2




    $begingroup$
    Can you put an LDR or photodiode on channel 2 to see when the light triggers? I think you can use an LED as a photodiode if you're stuck. Check the web. (It's hard to be original these days.)
    $endgroup$
    – Transistor
    May 27 at 22:08










  • $begingroup$
    I'll try it out. Alternatively I can hook up the second channel to LED driver output and monitor the waveforms.
    $endgroup$
    – Whiskeyjack
    May 28 at 3:13






  • 3




    $begingroup$
    If you think those ripples are bad, check this guy who noticed that his utility company injects 9% 1 kHz ripple on purpose.
    $endgroup$
    – pipe
    May 28 at 8:03










  • $begingroup$
    I am hoping that different ICs in led drivers will have different response to this glitch. I am planning to test a different matching LED driver. I will post an update once I find something.
    $endgroup$
    – Whiskeyjack
    May 28 at 10:07








2




2




$begingroup$
Can you put an LDR or photodiode on channel 2 to see when the light triggers? I think you can use an LED as a photodiode if you're stuck. Check the web. (It's hard to be original these days.)
$endgroup$
– Transistor
May 27 at 22:08




$begingroup$
Can you put an LDR or photodiode on channel 2 to see when the light triggers? I think you can use an LED as a photodiode if you're stuck. Check the web. (It's hard to be original these days.)
$endgroup$
– Transistor
May 27 at 22:08












$begingroup$
I'll try it out. Alternatively I can hook up the second channel to LED driver output and monitor the waveforms.
$endgroup$
– Whiskeyjack
May 28 at 3:13




$begingroup$
I'll try it out. Alternatively I can hook up the second channel to LED driver output and monitor the waveforms.
$endgroup$
– Whiskeyjack
May 28 at 3:13




3




3




$begingroup$
If you think those ripples are bad, check this guy who noticed that his utility company injects 9% 1 kHz ripple on purpose.
$endgroup$
– pipe
May 28 at 8:03




$begingroup$
If you think those ripples are bad, check this guy who noticed that his utility company injects 9% 1 kHz ripple on purpose.
$endgroup$
– pipe
May 28 at 8:03












$begingroup$
I am hoping that different ICs in led drivers will have different response to this glitch. I am planning to test a different matching LED driver. I will post an update once I find something.
$endgroup$
– Whiskeyjack
May 28 at 10:07




$begingroup$
I am hoping that different ICs in led drivers will have different response to this glitch. I am planning to test a different matching LED driver. I will post an update once I find something.
$endgroup$
– Whiskeyjack
May 28 at 10:07










3 Answers
3






active

oldest

votes


















12














$begingroup$

The first waveform looks fine for mains, it can get much worse.

I suggest you use a rent a power corruptor, or use a lab with an operator, to see how vulnerable your dimmer is.



And work with those results to improve the design of the phase angle dimmer.






share|improve this answer









$endgroup$











  • 1




    $begingroup$
    TIL about "power corruptors". It's like integration testin, but for hardware. Neat!
    $endgroup$
    – Alexander
    May 28 at 2:19



















7














$begingroup$

The distortion is due to diode rectifiers, phase angle rectifiers. The distortion is not such big that should cause any malfunction. Possibly, the LED power supply misinterprets these false glitches with expected phase angle voltage from the dimmer.






share|improve this answer









$endgroup$















  • $begingroup$
    Will active PFC in the LED driver lead to the said misinterpretation?
    $endgroup$
    – Whiskeyjack
    May 27 at 9:51



















2














$begingroup$

Flicker: as dimmed, the LEDs have longer dark time than with full light. The light from the fluorescent material decays more. The human eye can well see the flicker, at least if the LED is a little aside from the center of the field of the vision. It has been the same with fluorescent lights and old CRT televisions.



Another thing: If you have another non-linear load which also distorts the voltage waveform and does it in somehow a complex and different way, the summed distortions can produce mixing results in nonlinear components. Some of them can be in the visible frequency range. Without proper spectral analysis this all is only speculation.






share|improve this answer











$endgroup$

















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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    12














    $begingroup$

    The first waveform looks fine for mains, it can get much worse.

    I suggest you use a rent a power corruptor, or use a lab with an operator, to see how vulnerable your dimmer is.



    And work with those results to improve the design of the phase angle dimmer.






    share|improve this answer









    $endgroup$











    • 1




      $begingroup$
      TIL about "power corruptors". It's like integration testin, but for hardware. Neat!
      $endgroup$
      – Alexander
      May 28 at 2:19
















    12














    $begingroup$

    The first waveform looks fine for mains, it can get much worse.

    I suggest you use a rent a power corruptor, or use a lab with an operator, to see how vulnerable your dimmer is.



    And work with those results to improve the design of the phase angle dimmer.






    share|improve this answer









    $endgroup$











    • 1




      $begingroup$
      TIL about "power corruptors". It's like integration testin, but for hardware. Neat!
      $endgroup$
      – Alexander
      May 28 at 2:19














    12














    12










    12







    $begingroup$

    The first waveform looks fine for mains, it can get much worse.

    I suggest you use a rent a power corruptor, or use a lab with an operator, to see how vulnerable your dimmer is.



    And work with those results to improve the design of the phase angle dimmer.






    share|improve this answer









    $endgroup$



    The first waveform looks fine for mains, it can get much worse.

    I suggest you use a rent a power corruptor, or use a lab with an operator, to see how vulnerable your dimmer is.



    And work with those results to improve the design of the phase angle dimmer.







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered May 27 at 9:49









    Jeroen3Jeroen3

    14.2k20 silver badges53 bronze badges




    14.2k20 silver badges53 bronze badges











    • 1




      $begingroup$
      TIL about "power corruptors". It's like integration testin, but for hardware. Neat!
      $endgroup$
      – Alexander
      May 28 at 2:19














    • 1




      $begingroup$
      TIL about "power corruptors". It's like integration testin, but for hardware. Neat!
      $endgroup$
      – Alexander
      May 28 at 2:19








    1




    1




    $begingroup$
    TIL about "power corruptors". It's like integration testin, but for hardware. Neat!
    $endgroup$
    – Alexander
    May 28 at 2:19




    $begingroup$
    TIL about "power corruptors". It's like integration testin, but for hardware. Neat!
    $endgroup$
    – Alexander
    May 28 at 2:19













    7














    $begingroup$

    The distortion is due to diode rectifiers, phase angle rectifiers. The distortion is not such big that should cause any malfunction. Possibly, the LED power supply misinterprets these false glitches with expected phase angle voltage from the dimmer.






    share|improve this answer









    $endgroup$















    • $begingroup$
      Will active PFC in the LED driver lead to the said misinterpretation?
      $endgroup$
      – Whiskeyjack
      May 27 at 9:51
















    7














    $begingroup$

    The distortion is due to diode rectifiers, phase angle rectifiers. The distortion is not such big that should cause any malfunction. Possibly, the LED power supply misinterprets these false glitches with expected phase angle voltage from the dimmer.






    share|improve this answer









    $endgroup$















    • $begingroup$
      Will active PFC in the LED driver lead to the said misinterpretation?
      $endgroup$
      – Whiskeyjack
      May 27 at 9:51














    7














    7










    7







    $begingroup$

    The distortion is due to diode rectifiers, phase angle rectifiers. The distortion is not such big that should cause any malfunction. Possibly, the LED power supply misinterprets these false glitches with expected phase angle voltage from the dimmer.






    share|improve this answer









    $endgroup$



    The distortion is due to diode rectifiers, phase angle rectifiers. The distortion is not such big that should cause any malfunction. Possibly, the LED power supply misinterprets these false glitches with expected phase angle voltage from the dimmer.







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered May 27 at 9:48









    Marko BuršičMarko Buršič

    12.4k2 gold badges9 silver badges14 bronze badges




    12.4k2 gold badges9 silver badges14 bronze badges















    • $begingroup$
      Will active PFC in the LED driver lead to the said misinterpretation?
      $endgroup$
      – Whiskeyjack
      May 27 at 9:51


















    • $begingroup$
      Will active PFC in the LED driver lead to the said misinterpretation?
      $endgroup$
      – Whiskeyjack
      May 27 at 9:51
















    $begingroup$
    Will active PFC in the LED driver lead to the said misinterpretation?
    $endgroup$
    – Whiskeyjack
    May 27 at 9:51




    $begingroup$
    Will active PFC in the LED driver lead to the said misinterpretation?
    $endgroup$
    – Whiskeyjack
    May 27 at 9:51











    2














    $begingroup$

    Flicker: as dimmed, the LEDs have longer dark time than with full light. The light from the fluorescent material decays more. The human eye can well see the flicker, at least if the LED is a little aside from the center of the field of the vision. It has been the same with fluorescent lights and old CRT televisions.



    Another thing: If you have another non-linear load which also distorts the voltage waveform and does it in somehow a complex and different way, the summed distortions can produce mixing results in nonlinear components. Some of them can be in the visible frequency range. Without proper spectral analysis this all is only speculation.






    share|improve this answer











    $endgroup$




















      2














      $begingroup$

      Flicker: as dimmed, the LEDs have longer dark time than with full light. The light from the fluorescent material decays more. The human eye can well see the flicker, at least if the LED is a little aside from the center of the field of the vision. It has been the same with fluorescent lights and old CRT televisions.



      Another thing: If you have another non-linear load which also distorts the voltage waveform and does it in somehow a complex and different way, the summed distortions can produce mixing results in nonlinear components. Some of them can be in the visible frequency range. Without proper spectral analysis this all is only speculation.






      share|improve this answer











      $endgroup$


















        2














        2










        2







        $begingroup$

        Flicker: as dimmed, the LEDs have longer dark time than with full light. The light from the fluorescent material decays more. The human eye can well see the flicker, at least if the LED is a little aside from the center of the field of the vision. It has been the same with fluorescent lights and old CRT televisions.



        Another thing: If you have another non-linear load which also distorts the voltage waveform and does it in somehow a complex and different way, the summed distortions can produce mixing results in nonlinear components. Some of them can be in the visible frequency range. Without proper spectral analysis this all is only speculation.






        share|improve this answer











        $endgroup$



        Flicker: as dimmed, the LEDs have longer dark time than with full light. The light from the fluorescent material decays more. The human eye can well see the flicker, at least if the LED is a little aside from the center of the field of the vision. It has been the same with fluorescent lights and old CRT televisions.



        Another thing: If you have another non-linear load which also distorts the voltage waveform and does it in somehow a complex and different way, the summed distortions can produce mixing results in nonlinear components. Some of them can be in the visible frequency range. Without proper spectral analysis this all is only speculation.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited May 27 at 20:52









        Peter Mortensen

        1,5953 gold badges14 silver badges22 bronze badges




        1,5953 gold badges14 silver badges22 bronze badges










        answered May 27 at 12:14









        user287001user287001

        10.6k1 gold badge6 silver badges18 bronze badges




        10.6k1 gold badge6 silver badges18 bronze badges


































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Interview With Slayer Guitarist Jeff Hanneman”originalet”Thinking Out Loud: Slayer's Kerry King on hair metal, Satan and being polite””Slayer Lyrics””Slayer - Biography””Most influential artists for extreme metal music””Slayer - Reign in Blood””Slayer guitarist Jeff Hanneman dies aged 49””Slatanic Slaughter: A Tribute to Slayer””Gateway to Hell: A Tribute to Slayer””Covered In Blood””Slayer: The Origins of Thrash in San Francisco, CA.””Why They Rule - #6 Slayer”originalet”Guitar World's 100 Greatest Heavy Metal Guitarists Of All Time”originalet”The fans have spoken: Slayer comes out on top in readers' polls”originalet”Tribute to Jeff Hanneman (1964-2013)””Lamb Of God Frontman: We Sound Like A Slayer Rip-Off””BEHEMOTH Frontman Pays Tribute To SLAYER's JEFF HANNEMAN””Slayer, Hatebreed Doing Double Duty On This Year's Ozzfest””System of a Down””Lacuna Coil’s Andrea Ferro Talks Influences, Skateboarding, Band Origins + More””Slayer - Reign in Blood””Into The Lungs of Hell””Slayer rules - en utställning om fans””Slayer and Their Fans Slashed Through a No-Holds-Barred Night at Gas Monkey””Home””Slayer””Gold & Platinum - The Big 4 Live from Sofia, Bulgaria””Exclusive! Interview With Slayer Guitarist Kerry King””2008-02-23: Wiltern, Los Angeles, CA, USA””Slayer's Kerry King To Perform With Megadeth Tonight! - Oct. 21, 2010”originalet”Dave Lombardo - Biography”Slayer Case DismissedArkiveradUltimate Classic Rock: Slayer guitarist Jeff Hanneman dead at 49.”Slayer: "We could never do any thing like Some Kind Of Monster..."””Cannibal Corpse'S Pat O'Brien Will Step In As Slayer'S Guest Guitarist | The Official Slayer Site”originalet”Slayer Wins 'Best Metal' Grammy Award””Slayer Guitarist Jeff Hanneman Dies””Kerrang! Awards 2006 Blog: Kerrang! Hall Of Fame””Kerrang! Awards 2013: Kerrang! Legend”originalet”Metallica, Slayer, Iron Maien Among Winners At Metal Hammer Awards””Metal Hammer Golden Gods Awards””Bullet For My Valentine Booed At Metal Hammer Golden Gods Awards””Metal Storm Awards 2006””Metal Storm Awards 2015””Slayer's Concert History””Slayer - Relationships””Slayer - Releases”Slayers officiella webbplatsSlayer på MusicBrainzOfficiell webbplatsSlayerSlayerr1373445760000 0001 1540 47353068615-5086262726cb13906545x(data)6033143kn20030215029