An existing PSU has an input of 110/230 VAC and an output claimed to be 52 VDC at 1.85 amps, but in reality the output is unstable up to 64VDC. The PSU's were purchased to drive a CCTV POE board serving 8 ports to 8 IP CCTV cameras. A component on the POE board cannot tolerate a voltage above 57-58, so at 64 short-circuits and starts a fire. The solution possibe ( perhaps ) is to create a small regulator board with a regulator such as the TL783. This board ( boxed ) could then sit between the PSU and the POE board and by an 8 ohm variable pot hold the voltage down to near 52. The owner of the faulty PSU's has over 1000 in his warehouse and may not be prepared to bother with the above solution, even if it works but will then be in the market for a replacement 52VDC regulated PSU. If he opts for a total safe replacement then my scheme is still viable, for by adding a cheap voltmeter and a cheap ammeter we have a cheap variable bench power supply of about 0 to 60 VDC at 1.85 amps. Depending on the loss across the 783, or whatever regulator is selected. Cheap if the owner will sell the faulty PSU's for peanuts. Apart from the wandering DC output they are fine. I have a test rig set up to test a prototype with an 8 port SOE and eight cameras, but I need a regulator prototype to prove it all works - veroboard is good enough. Will go 50/50 on any potential if either way works.
13 freelancers are bidding on average £212 for this job
If you have a schematic and a unit to test I may be able to determine a point within the circuit where a zener or some such would stabilize it. Bid is just a placeholder to send a message.
Hi, Can we discuss the project further? I have done similar project and understood the project outline. Please give me a chance. A trial will convince you. Looking forward to work with you.