In Progress

Design me a 5V supervisory circuit to cut 3A power

Background:

I'm building a product based around the raspberry pi. Together with all the periphals the product draws a little less than 3A from the same 5V source (switched 5V power supply).

I've solved the problems with blackouts and sudden power losses but having some issues with brownouts.

When power at some point is below specified minimum level [url removed, login to view] the raspberry starts acting incorrectly. Sometimes it results in a kernel panic and sometimes the SD-card gets permanently corrupted.

Both cases are inacceptable since they render the device unusable (In the second case it's forever).

Case:

I would like to have a supervisory circuit between the power supply and my product. If the power is lower than [url removed, login to view] it should be cut and not restored until some time has passed.

Ideas:

I'm thinking that the supervisory components like a MCP1x0-485 from microchip together with appropriate transistors or motsfets can be useful? But I'm a software guy and open to suggestions.

Task:

I want a design of a supervisor circuit that can take 5V DC power on one side and deliver 4,75V or higher on the other end but never less than 4,75V (no upper limit required).

In case of less than 4,75 on the supply side, a stabilization period is requested (open to suggestions based on component selection).

I want a circuit schema layout and a parts list from Farnell, no pcb-layout needed.

If you can find me a solution with few components and/or low cost (but still reliable) I'll hit the bonus button when we're done.

Skills: Electrical Engineering, Electronics, Microcontroller, PCB Layout, Product Design

See more: software component design, schema design, reliable parts, product design of all time, open source pcb layout software, open source pcb layout, find a solution, engineering supervisor, engineering design software, design case find, dc design, pcb design and layout, find power point, product render, POWER SUPPLY, pcb layout design, pcb circuit, panic button, engineering design, electrical product, electrical power, electrical layout, Electrical CIRCUIT, design of pcb, design me

About the Employer:
( 9 reviews ) Täby, Sweden

Project ID: #7400317

Awarded to:

sagradoamicus

hi sir i am an expert electrical engineer I can do it for you. I have almost 4 years of experience in this field. I assure you quality work and ontime delivery Please reply to discuss it further Regards

$50 USD in 1 day
(192 Reviews)
7.5

10 freelancers are bidding on average $49 for this job

geekyexperts

Hello, I am an Electronics and Embedded system developer. I have experience in Digital and Analog electronic design and Matlab. Kindly check my profile. Reply me back and will discuss the details further. Thankyou

$100 USD in 1 day
(59 Reviews)
6.7
shahbaz1980

Hi there, Have a nice day. There are multiple solution to the problem. The main cause for this is due to sudden current drain that causes the board to get reset. Now coming to solution. 1. check if there are som More

$50 USD in 1 day
(45 Reviews)
6.8
bijan01in

Hello sir I am interested to your project. I am familiar with electronics, microcontroller as well as PCB design by eagle. Thanks.

$35 USD in 3 days
(57 Reviews)
5.3
cscinstructor

i have read and understand your requirement............ kindly open chat to proceed it further............................................................................................................................ More

$55 USD in 2 days
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5.2
anatolyzimin

A proposal has not yet been provided

$50 USD in 3 days
(12 Reviews)
5.1
COFL

Hi I am interested to this project. Thanks...............................................................................................

$50 USD in 4 days
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2.9
cpla7

A proposal has not yet been provided

$35 USD in 2 days
(0 Reviews)
0.0
Aloz1

I'm thinking all you'll need is a voltage comparator, a mosfet, some resistors and a reference voltage (a zener diode may be fine for this). The idea is that once your supply voltage goes lower than ~4.8v, the comparat More

$39 USD in 1 day
(0 Reviews)
0.0
effreek

I have experience working on FET shutdown circuits and can provide you a solution using the MCP part listed along with 2 FETs and a couple of resistors. Thanks,

$30 USD in 1 day
(0 Reviews)
1.4