Design for a simple power supply with battery backup - Stage 1

$30-250 AUD

In Progress

Posted

about 8 years ago

$30-250 AUD

Paid on delivery

A simple battery backup circuit design required for a Power Supply of which I can then accrue parts to build. Will need to sit inside a weatherproof box with the appropriate externally seated plugs or flying leads coming out. It will have an AC input 90-240V, something like an IEC or other common plug feed to bring power into the box. Then Transform to 9 volts 1.5A coming back out of the box into a DC plug (like a laptop one). If the AC goes off I need to keep delivering 9V output, so need a battery backup, eg. Lead acid, would kick in for at least 3 hours, for periods when the electrical source needs to be unplugged, or the power supply moved around. Will need to be conscious of heat buildup inside the box, if it can be designed that way, to minimize modifications to the weatherproof box for heat dissipation, without going to the expense of using high-end di-casting product, if it can be helped. And should be designed to protect from overloading, short circuits, reverse polarity etc. I am not an expert in these terms so forgive my electro term mis-usage.

Electrical Engineering

Project ID: 9756686

About the project

8 proposals

Remote project

Active 8 yrs ago

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Awarded to:

@angehiderick

I have been developing power supplies and inverters for quite long period of time. your project will require a step donn transformer, rectification and then voltage regulation for the AC part. for the DC part is just an inverter with auto changer switch between AC and DC so that at least one source of power is avaiable.

$155 AUD in 3 days

0.0

(1 review)

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8 freelancers are bidding on average $385 AUD 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 circuits design, Regulated power supplies design with universal input to DC output, SMPS, DC-DC, AC-DC converters design, Battery management system, Battery chargers, UPS design, sine wave Inverters, solar grid tie inverters, Solar battery chargers and street light systems design from few watts to KW range using Buck, Boost, and Buck –boost, Interleaved boost/buck, Fly back Push Pull and H-bridge inverters. I have work experience to design from few watts to KW range meeting all compliances like EMI/EMC and safety standards UL etc.

$555 AUD in 12 days

4.8

(56 reviews)

6.6

@sahanwa23

Hi! Im an electrical and electronic masters student studying in UWE. I have the experience of coding in C/C++/Assembly/Arduino/PIC C/MikroC/MATLAB for more than three years. I also have the knowledge and experience of ELECTRICAL AND ELECTRONICS circuit analysis and design. I also have experience in embedded systems using microcontrollers like PIC, ATMEL, ARDUINO and most of the other types. I have done BCS (British computer society) diploma level. I have the knowledge on PHP/HTML5/mySQL for website development. I have completed many freelancer assignments successfully. If you are interested in hiring me, please send me a message. I have made a lot of reports in the recent past. I have good experience in using Microsoft office softwares like Word, Excel and Powerpoint. I can write reports of any length without mistakes. Thank you!

$166 AUD in 3 days

4.8

(27 reviews)

4.5

@abhijitpotdar21

I have good industrial experience of Design for a simple power supply with battery backup. I already did Design for a simple power supply with battery backup work

$888 AUD in 3 days

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(0 reviews)

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@rlwalker73

I have over 15 years experience in electronic and electrical product design and development. If you give me the maximum ambient temperatures that your circuit needs to function in, I can design you a circuit that will work. My proposal assumes delivery of the design files necessary to build your circuit. If more support is needed, please let me know.

$250 AUD in 7 days

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@eselvaretnam

Hi, To actually consider doing this piece of work I need actually discuss your requirements with you thoroughly. This is such that I can understand the constraints you need to work within and if I am able to help you. Here are a few of the questions I need answered. When is the deadline for this project? What options have you already considered? Does this need to work with both 110V and 240V? What type of load are you driving with 9V ( What are you running with it?) and how much current does it consume? What are the dimensions of the enclosure? What is your materials budget?

$333 AUD in 7 days

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@zhongmingchen

what you need is an UPS back up circuit, we can use simple supervisor circuit to monitor the 9v output from powers supply and call the battery backup if necessary. Rechargeable battery is preffered and you also need to minimize output ripple and harmonic to make battery life longer. I am an expert power electronics engineer holding a master degree and also working on my PhD. program. Have been in this industry for years and got a lot of hands on experience.

$333 AUD in 5 days