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Forum Index : Electronics : DPS Power Supplies.
| Author | Message | ||||
| Phil23 Guru  Joined: 27/03/2016 Location: AustraliaPosts: 1664 |
Hi All, Looking for feedback on this. Seems like I've killed two of these power supplies within days of assembling them. First a DPH3205, assembled stand alone in a case on Sunday a fortnight ago. Found it had no output two days later. Second was a DPS3205 that I cut into my 30 year old power supply case yesterday. It's dead in under 24 hours. Controls still work, voltage adjustable, but neither of them can supply current. I had a light bulb moment before this post; about what I have done in both cases. Does this sound like a practice that would destroy this type of module? In both cases I've connected the output to a paralleled pair of 18650's & charged them with CV/CC set to 4.2V & 4.0A. Never left them unattended & monitored voltage & current, But, when I finished playing about, in both cases, I turned off the input to the supplies & left the batteries connected to the output overnight.... These are the two I'm referring to. RD Official Store.   |
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| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1664 |
Dickhead alert... Realised a while ago that the second one is still Ok. (DPS5005 Actually). Forgot the fact that when I turned it off last night I moved the alligator clip connecting the batteries to part of the insulation to they weren't powering the output of the module. Still leaves the question of why the 1st one, DPH3205 (Buck-Boost version) failed. It was in a case with a 40mm fan, but the vents on the bottom could have been sealed by the table it was on. It would have been left on with a very low load, so I would not have expected heat to have been an issue, Cheers. |
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poida Guru Joined: 02/02/2017 Location: AustraliaPosts: 1419 |
I tend to view the cheap things from China as a good starting point. We need to burn them in, prove they work, etc. Then I stand back and admire my bargain hunting if it seems to be fine after a few weeks. The profit margins on all this stuff must be tiny. I also think there is a widely held view in China that goes "it doesn't work? OK, throw it away. Get another." Eventually they arrive where things work well enough, and nobody lost much time repairing things. For sure, we stumble upon great little things now and then. The above PS is one of them. Maybe the failed one has a marginal solder joint somewhere.. It's also about how much you value your spare time. My spare time is billed at $50/hr. I don't like to waste hours looking at fixing something that costs $35, for example. Unless I find it educational. I am happy to pay $50/hr for good education. wronger than a phone book full of wrong phone numbers |
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| hary Regular Member  Joined: 15/04/2019 Location: FrancePosts: 89 |
Did you put a diode between the PS and your 18650 ? Or are you sure they are meant to charge without needing a diode ? There are 2 versions : 1 needs diode for charging battery. the other don"t need (might be already included in the circuitry) |
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