Cancelled

Solve A PSU regulation problem

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.

Skills: Circuit Design, Electronics

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About the Employer:
( 0 reviews ) United Kingdom

Project ID: #14204389

13 freelancers are bidding on average £212 for this job

seshupower

Hi, I am a post graduate power electronics engineer and having very good industrial experience of 8+ years in R&D and project development. I am excellent welding power supplies design, high frequency transformers desi More

£333 GBP in 3 days
(51 Reviews)
6.5
Davelelievre

I have over 35 years experience as an electronic design engineer, please see my profile for more details The current price and timescales are only place holders to allow me to communicate with you I am afraid I don' More

£250 GBP in 3 days
(22 Reviews)
6.2
microembedded

hi i am an electrical engineer. i have vast experience related to circuit design and pcb design. i have done many power supply system projects. i have hardware experience regarding PSU design and regulator design . let More

£250 GBP in 3 days
(25 Reviews)
5.8
jandle

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.

£250 GBP in 5 days
(7 Reviews)
5.2
£250 GBP in 3 days
(9 Reviews)
5.3
adipdutt

Actually the TL786 can deliver max 700mA of current,, it is better if you use a transistor resistor Zener diode combination to reduce the voltage by 5Volt. and 1.8 A , there is another way use a LDO with boosted ground More

£150 GBP in 3 days
(10 Reviews)
4.2
SantoshKGD

Hi, Please share Power Supply's Model-No/Datasheet/Link. And if you have open one of the unit and share the picture (any free space available), so we can make a small Regulator to fit inside the unit and use the enc More

£277 GBP in 5 days
(5 Reviews)
4.0
Valuesolutions

Hello, how are you? I hope you have a bright day/evening from your side. I have read the details provided, but please contact me so that we can discuss more on the project. I believe I have the required skills in this More

£142 GBP in 3 days
(2 Reviews)
3.3
chyconsl

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.

£150 GBP in 3 days
(0 Reviews)
0.0
wei20170521

it is a very simple problem.i hope that u can take a pic of ur device,and draw a circuit .and i will help u finish ur circuit and make sure i can [login to view URL] i can do a experiment and take pic for [login to view URL] forget that i can More

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0.0
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£250 GBP in 5 days
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0.0
deksarlabs

We have analysed the project and will surely be able to complete it. We have done a lot of work related to circuit design.

£150 GBP in 20 days
(0 Reviews)
0.0