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Apologies in advance - I'm a software guy who likes to dabble here and there and my latest project is a little beyond the comfort zone.

I'm building an induction heater (with off-the-shelf parts for most) which will be used to anneal brass.

I'm using a basic 48v 20A PSU, this goes into a DPS5020 which is a fancy buck converter (https://www.banggood.com/RUIDENG-DPS5020-Constant-Voltage-Current-Step-down-Communication-Digital-Power-Supply-p-1181200.html?ID=514816&cur_warehouse=CN) - This means I have current and voltage limiting / protection.

I've then got going via an SSR into a ZVS induction board (like https://www.banggood.com/1000W-20A-ZVS-Induction-Heating-Machine-Cooling-Fan-PCB-Copper-Tube-12-36V-p-1089662.html?rmmds=search&cur_warehouse=CN)

I've tested this basic set up powering on the PSU then the DPS and finally closing the SSR - all works well and metal gets hot.

What I'd like to do is remove the SSR from the circuit, as the DPS has the ability to remotely turn off/on (over serial / USB) which will simplify my project significantly.

Somewhere early on in my research for this, I remember reading that it is important that the supplied power is done so fast, otherwise the induction coil fails to oscillate and (I think) you'll release the magic smoke (hence why I bought a cheap SSR for testing).

What I need to do is figure out if the DPS5020 can power on fast enough to allow the inductor to oscillate, but I have no idea where to start and so far Google has failed me.

I don't have an oscilloscope (but if this is the only way, I'll ask around) and obviously I don't want to just go ahead and try it, if it could fry something!

So how on earth do I work out if the DPS5020 can power it's output fast enough for the induction board to oscillate?

Thanks in advance.

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  • \$\begingroup\$ Does the manufacturer tell you how quickly power must be ramped up, or was that discovered by the user base? Does anyone know how fast it must be ramped up? This may be one of those questions that can only be answered by experiment (which may mean burnt up induction heaters). \$\endgroup\$ – TimWescott Jan 18 at 22:10
  • \$\begingroup\$ If you can't find joy with your actual question, you could either find a controller for the SSR that'll work over USB, or you could make a time-delay circuit that triggers the SSR 1/2 or 1/4 (or something) of a second after it powers up. \$\endgroup\$ – TimWescott Jan 18 at 22:11
  • \$\begingroup\$ Hi Tim, I think it's generally a known thing with these type of induction boards as far as I can tell... but details on the ramp are not apparent (to me at least) - my fallback is an arduino to handle turning on the DPS (via serial) then SSR and it taking care of the timing (it'll power off SSR and DPS after user specified number of seconds) \$\endgroup\$ – Tim Pope Jan 18 at 22:30

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