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Just started design work for a project for Burning Man 2013. It involves a central controller which will be a PC, and about 36 remotely scattered microcontroller-based modules that must communicate to the PC wirelessly. Here are the requirements:
1. The maximum distance from PC to module...
Sorry, this doesn't make sense to me. If a triac is a pair of oppositely oriented SCR's with a common gate, then isn't tying the gate to either MT1 or MT2 with a resistor the same as having one of the SCR's on all the time?
This is also a great suggestion. I will try a back-to-back SCR configuration and see if that can allow me to remove the cap. Right now I am not able to power the load off completely when the TRIAC is off, because (obviously) I have a capacitor divider circuit across the power supply and both...
Sorry, I meant to comment about the other thread. Thanks, FvM, for linking to it.
Two important notes, I am not sure either is 100% relevant but here goes:
(1) The snubber circuits for the MOC3011 indicated in the thread are for INDUCTIVE loads, not CAPACITIVE. My understanding of the...
I am not convinced the MOC3023 was self-triggering. By removing the MOC3023 and using the circuit (below) without any trigger (or capacitor), the TRIAC remained on anyways.
I really appreciate everyone's feedback and insight into dv/dt. However, reducing either the voltage OR the...
Genome -
YOU'RE A GENIUS!!
Putting a small C1 across the M1/M2 terminals of the triac did the trick. I didn't even try the resistor yet. I am so thrilled! (And Relieved.)
It is not a 100% solution, as yet, as I have different loads measuring from about 0.002 uF to 0.0213 uF. For the...
This problem has had me pulling my hair out for 2 weeks now... it is wired up on my bench and can't find the right incantation to make it work!
How do I do TTL level switching of a high voltage A/C circuit with the modified sine wave as shown? Should I be using something other than a triac...
If the analog input is an Analog-Digital converter (ADC) or a microcontroller's analog input, check the specs for the chip. It may have a specification for internal resistance or leakage current. You will want a resistance low enough to compensate for the leakage but not so low as to strain...
Subject says it all, really. I am a little out-of-my-league when it comes to triacs and SCRs. The power supply is a square wave and I cannot get the triac to turn off. I suspect it has to do with the fact there is no zero-crossing or that the load is capacitive but don't know how to fix it...
I understand the basic theory behind the snubber network. But the purpose of it is to dissipate power from inductive flyback when the MOSFET turns off, right? I don't see how dissipating power is going to make the circuit more efficient. As an experiment I used a series snubber of 100 ohms...
Where is the R-C connected? Between MOSFET Source and ground? Should I assume the R-C constant is the same as the driver frequency? Or is it some ratio?
This sounds ideal! I'd like to try it. Do you have a snippet of a schematic that depicts how this is configured? I am not sure the...
The following circuit is on a breadboard on my bench, it runs at 40 kHz with approximately 10-15% duty cycle. The end goal is to get 170-200 volts in the output as efficiently as possible.
My Question: How do I tune this Push-Pull circuit to get maximum efficiency? As it is now, most of...
Nevermind. After adjusting the PWM to about 10% duty cycle the circuit is working perfectly. Power supply no longer pegs out and I'm getting 140+ volts effortlessly. I can now adjust the supply voltage to get my target output voltage.
My end goal is to produce 170-200 volts DC at up to 5 watts. The circuit on my bench at the moment is a simple push-pull using a CCFL transfomer I bought off Digikey. However, I cannot seem to tune the circuit. It is drawing too much current and the MOSFETs get warm after a while.
Here's...
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