Thank you very much for your interestHi,
snubbers often are used for reducing the dV/dt problem that may cause false trigger.
A varistor can´t do this.
If you just want to limit the voltage (spikes) you may go for a varistor.
I successfully did this in some of my applications:
The benefit is:
* in my opinion they give better protection against high voltage on a high energy pulse
(in my case primary cut off while a transformer is involved)
* the are high ohmic in normal situations.
Klaus
I had completely removed it from my mind when I first heard it, thinking that snubberless versions could not replace the real snubber. Thank you very much for reminding me and for your interest.But to reduce leakage current getting to the load, you may use X caps to Neutral to bypass some of the leakage current and some resistance on Vgc to reduce input leakage.
I apologize for not being as knowledgeable about the subject as you are, and for not being able to understand anything from your conceptual explanations, considering the losses during translation.Leakage and false triggering are design tradeoffs. You cannot eliminate shunt capacitance but you can embed it into the chip and still add more snubbing externally.
It all depends on your transient noise environment requirements with switched inductance spikes and line noise filtering to what is best suited for you application. False trigger consequences or leakage current consequences.
A TVS or MOV is a good solution current limited, with a Snubberless Triac. Line filters are also a good solution which also have Y cap leakage to ground.
I chose a triac with high dv/dt value, BTB12-800CW's dv/dt level is 500V/uSFalse triggering of opto-triac or main triac can be caused by high voltage and dV/dt. Varistor doesn't reduce dV/dt.
If you decide for ZCD opto-triac, as you apparently do, high dV/dt at zero crossing can also cause skipping of half cycles when the voltage rises too fast to trigger ZCD. The effect is particularly dangerous for AC motor and coil loads.
This is the key pointIf you have a high dV/dt solution, how much is your tolerance to leakage current? Bypassing the line current to ground Y-caps in a line filter is a possibility, yet you now have 5€ cost rise limits. So until these specs are all defined, I don't see a possible solution.
It is necessary to put approximately 9W resistor for 310V peak voltage and 30mA current. I will keep it in mind to give an idea about an alternative solution or solution.Bypass to Neutral , not ground. But ground leakage is permitted to say 3 mA. for residential and 30 mA commercial in some locations.
It is necessary to put approximately 9W resistor for 310V peak voltage and 30mA current. I will keep it in mind to give an idea about an alternative solution or solution.Bypass to Neutral , not ground. But ground leakage is permitted to say 3 mA. for residential and 30 mA commercial in some locations.
It is necessary to put approximately 9W resistor for 310V peak voltage and 30mA current. I will keep it in mind to give an idea about an alternative solution or solution.Bypass to Neutral , not ground. But ground leakage is permitted to say 3 mA. for residential and 30 mA commercial in some locations.
It is necessary to put approximately 9W resistor for 310V peak voltage and 30mA current. I will keep it in mind to give an idea about an alternative solution or solution.Bypass to Neutral , not ground. But ground leakage is permitted to say 3 mA. for residential and 30 mA commercial in some locations.
It is necessary to put approximately 9W resistor for 310V peak voltage and 30mA current. I will keep it in mind to give an idea about an alternative solution or solution.Bypass to Neutral , not ground. But ground leakage is permitted to say 3 mA. for residential and 30 mA commercial in some locations.
It is necessary to put approximately 9W resistor for 310V peak voltage and 30mA current. I will keep it in mind to give an idea about an alternative solution or solution.Bypass to Neutral , not ground. But ground leakage is permitted to say 3 mA. for residential and 30 mA commercial in some locations.
Only "edaboard.com" has been very slow in my browser and computer for a long time. I have no problems with other pages.More likely it is your PC browser that is slow. Perhaps Windows is doing a backup, or update or something else. But latency does cause duplicates with edits.
>"It is necessary to put approximately 9W resistor for 310V peak voltage and 30mA current. "
NO.
It is common for LED Lamps to not turn off from Triac leakage, so in the past, an 8W tungsten lamp was used to make a dimmer work better. But Philips and others have solved that problem with integrated dimmable LED lamps with sufficient capacitance load.
Even though I clicked the post reply button many times after writing my message, it didn't seem to do anything. After a while, thinking that it had crashed, I copied what I wrote and reloaded the page. When the page reloaded I noticed that I had sent my message with each of my previous clicks and the "edit" button at the bottom of the page was no longer visible.Hi,
edaboard currently is having some delay problems.
Sorry for this inconvenience.
You still have limited time to review and edit your post.
Klaus
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