Hey Fellows, I have designed a NiCd battery charger for 3.6v 1900mAh flashlight cell. I have took Chatgpt help for that but now the design is not clear to me. can you guyz please check if the circuit is ok?
here are some of the pre requisites-
input 5v USB
over charge protection
over discharge protection
thermal protection
charging and full charge LED indicators
reverse polarity protection now required .

thank you in advance.

 

It is not clear to me how this is supposed to work. I would expect a NiCd battery charger to be able to set the charging current to (typically) I/10 or 190mA for a 1.9 Ah (1900 mAh)) battery, which will then be fully charged in 16 hours.. A more sophisticated charger would monitor the battery voltage and reduce charging current as the battery terminal voltage approaches the manufacturers declared voltage (typically 1.2 - 1.35 volts per cell, to prevent overcharging. a fully charged state can be maintained with a trickle charge of no more than the I/100 rate.

 

The circuit, in particular the NE555 connections and the use of the TL431, is baffling. As you designed it, please explain its intended operation, i.e. which parts are meant to do what.
In the absence of component values and correct numbering it's dificult to check if the circuit meets your pre-requisites.

 

I believe this is a prime example of an absurd AI-generated schematic, full of absolute nonsense.
It is hopeless. Can’t be fixed.

 

I believe this is a prime example of an absurd AI-generated schematic

I'm inclined to agree.

 

I'm inclined to agree.

Me too!

 

Rube Goldberg would be proud of that circuit.

 

Charging a nominally 3.6V NiCd battery (i.e.3 cells in series) may be a bit tricky with just a 5.0V supply as the fully charged voltage can be up to 4.2V which doesn't give you much headroom. There must be a trick to limit the current to say 100mA (rather than push the limit to 190mA) and to limit again to a trickle current when the voltage reaches say 3.9V. And there must be dedicated ICs for battery charging circuits although maybe you have to boost the 5.0V to something higher which adds complexity. I fancy using an ATtiny85 processor to control the process, including checking the temperature of the battery with a thermistor for safety. By turning off the charge current briefly every few seconds you can check the battery voltage to know where you are.

 

First 10-pin NE555 I've ever come across. Since when has the 555 had a ChipSelect or Current Sense?

 

First 10-pin NE555 I've ever come across. Since when has the 555 had a ChipSelect or Current Sense?

That is only one of about a dozen glaring errors.

 

First 10-pin NE555 I've ever come across. Since when has the 555 had a ChipSelect or Current Sense?

Well, I guess Chatgpt is so smart it just invented one.

 

Well, we've all had fun making a mockery of the TS with this one. Personally, I favour posts that stay on subject and try to be helpful. There is no such thing as stupid questions, just stupid answers

 

Well, we've all had fun making a mockery of the TS with this one. Personally, I favour posts that stay on subject and try to be helpful. There is no such thing as stupid questions, just stupid answers

He asked us to check his circuit and we did.
He didn't ask for alternative circuits.

But you are more than welcome to post what you feel is a more appropriate post.

 

Well, we've all had fun making a mockery of the TS with this one. Personally, I favour posts that stay on subject and try to be helpful. There is no such thing as stupid questions, just stupid answers

I don't think it's so much the TS as ChatGPT that's being mocked. This should be a learning experience for the TS, though, as this is a good example of a hallucination, where ChatGPT makes up an answer when it has no idea what the #$^* it's talking about. Want a real engineering answer? Skip the AI, and ask real engineers.

 

But you are more than welcome to post what you feel is a more appropriate post.

I already had a go with #8 hoping someone would critique it or build on it

 

Jerry;
Yes indeed you did.
But as Cruts mentioned, it is the AI-generated schematic we are criticizing here, not the OP.
Apologies to the OP.

Unfortunately AI has become a de facto standard for newbies to obtain answers. It is not only electronics, there are several documented cases where legal assistants have “researched” legal cases and presented the false facts in court.
The AI hallucinations are very real, and newbies should become aware that unless one knows exactly what and how to formulate a question, the results may very well be incorrect.

 

Like others, I also do not understand how the circuit works. I suggest asking the chat robot to explain.
AND, I DID NOT see any criticism of the TS, only making fun of the AI entity that pretended to be able to crate a design.
There are charging schemes for charging Ni-Cad batteries that are for easier to understand, plus, they would actually correctly charge a battery group.
BUT you will probably not find those circuits on the cartoon channel!! I sincerely hope that last comment offends the folks in charge.