Electric load

204

02:43:28

Simple electric load controlled by MOSFETs. I am currently building this to discharge Li-Ion 18650. A microcontroller will measure the voltage of the cell(s) and stop the discharging once a desired voltage is reached. This will prevent over-discharging. Also will there be a current sensor to ensure that the current never surpasses save usage of the cells. This shall also be controlled via the microcontroller, which will off course controll all the MOSFETs.

The reason for the weird resistor values is, that I got a bucket full of 0.1Ohm/25W resistors I wanna give purpose to. If I wanted to spend money on this project, I‘d off course have used properly weighed resistors.

published 8 years ago

Caldari

8 years ago

Nice man :)

2ctiby

8 years ago

You might be better off sticking to simple circuits for now. This schematic just shows meaningless short circuits.

tune1312

8 years ago

boss

Leicester77

8 years ago

@2ctiby Where are the short circuits?

2ctiby

8 years ago

Turn on just the first left switch on its own.... that lets over 28A flow directly from + to - at the battery via the first left Mosfet. That tiny resistor is not really doing anything worthwhile.....it is as though that resistor (and mosfet) were not there at all....ie a short circuit. Talking about a hypothetical micro control is not what presentations on EC are about. We need to see working circuits, not talk about some hypothetical IC managing a circuit. Plenty guys are here to help....but please step back a little and show something that you think might work on its own, rather than explaining a non-starter being able to work with a hypothetical IC.

Leicester77

8 years ago

@2ctiby Oh now I see where our problem lies. First of all, I made this for myself, then thought why not make it public. I didn't do this for educational purposes. Then the technical part. The 28A are wanted. This is an "electric load", which discharges the battery(s) on the far left. (The six in the middle are pointless though, right). The FETs are properly dimensioned, and the low ohmic resistors in the top row are load resistors with proper cooling. This tool serves me as a simple calculation sheet, no excel table could visualise it this fine. Is there still a problem with my sketch? May I ask you what your education level in electronics design is?

BillyT

8 years ago

I find that those inexperienced with need to exercise batteries, do not understand battery dischargers.

Leicester77

8 years ago

@BillyT I don’t quite get what you’re trying to say, but please tell me what I can do better and what is wrong.

BillyT

8 years ago

@Leicester77, I was commenting to you, not about you.

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