I'm trying to figure out if there's a way to convert a triac-generated phase-chopped AC fan speed control signal into a 5V DC PWM signal so I can control a 4-wire DC Delta fan. Specifically, I have an AC induction fan currently controlled via the triac method and I want to switch to a Delta RFB1324SHE-EP 24V DC fan that requires a 5V PWM signal for speed control. Any ideas or solutions would be greatly appreciated!
2 Answers
It sounds like you're trying to tackle a tricky problem, and honestly, there might not be a straightforward off-the-shelf solution for this. Converting AC signals to 5V PWM isn't simple, especially with how phase-cut control works. A bit more context about your setup would definitely help others to give better advice.
As for your project, have you thought about using analog controllers or maybe an AC-to-DC module to create a constant DC signal that could then be converted to PWM? That might be a more viable path.
Just a heads up, it’s crucial to ensure that your Delta fan’s control requirements match what you’re planning to create. Sometimes people mix up 4-wire fans—make sure it’s not a 3-phase AC fan you're dealing with. I thought Delta might just refer to the manufacturer, but it's always good to double-check the specs to avoid confusion.
Right, I think Delta here is the brand. But I guess it never hurts to ask. Better safe than sorry when it comes to wiring these things!
Yeah, I'm actually looking into using an AC-to-DC dimmer module to get a steady voltage from the phase-cut signal. I found an analog scaling module to get that DC output, which I hope will feed into a voltage-to-PWM converter. Fingers crossed it all works out!