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dhsa_4485611
Level 1
Level 1
10 sign-ins 5 replies posted 5 questions asked

Hi,

We have done lots of research in AC phase cut dimming application, but still getting flickering issue.

Our project file & block diagram is attached here. We want to switch to interrupt enable software, please support us if anyone have done this.

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1 Solution
Vasanth
Moderator
Moderator
Moderator
250 sign-ins 500 solutions authored First question asked

Hi Dharmendra,


The issue is normally found when LED light is used as load. See the following article found on internet.

Why TRIAC Dimmers Often Cause Flickering, Blinking in LED Lamps

Best Regards,
Vasanth

View solution in original post

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6 Replies
Vasanth
Moderator
Moderator
Moderator
250 sign-ins 500 solutions authored First question asked

Hi,

When are you seeing the flickering issue ? Is it present all throughout or only while changing the brightness? If it is happening while dimming, is it happening when you are at a specific range ? What type of load are you using ? Is it an LED light ?

Best Regards,
Vasanth

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odissey1
Level 9
Level 9
First comment on KBA 1000 replies posted 750 replies posted

dhsa,

is zero-crossing input works reliably? What is phase-shift between AC mains and digital signal? Can you post an o-scope screenshot?

/odissey1

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dhsa,

Is rectifier BR1 necessary for optocoupler operation? According to the part number (H11AA2), it is bi-polar.

/odissey1

DIMMER.png

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WhatsApp Image 2020-03-11 at 5.36.03 PM.jpeg

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Yellow is our ZCD signal of 100Hz & Pink is Output AC.

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Vasanth
Moderator
Moderator
Moderator
250 sign-ins 500 solutions authored First question asked

Hi Dharmendra,


The issue is normally found when LED light is used as load. See the following article found on internet.

Why TRIAC Dimmers Often Cause Flickering, Blinking in LED Lamps

Best Regards,
Vasanth

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