Author Topic: NiMH Charger Schematic  (Read 314 times)

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Offline girishv

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NiMH Charger Schematic
« on: April 25, 2021, 04:24:12 pm »


This is a NiMH discharge/charge circuit based on NXP application note AN3392, which can be found at https://www.nxp.com/docs/en/application-note/AN3392.pdf.

I have attached the simplified diagram posted found in the above mentioned application note.



Will this work or need any changes?
 

Offline Pineapple Dan

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Re: NiMH Charger Schematic
« Reply #1 on: April 25, 2021, 04:35:15 pm »
You have no significant size capacitor on the input and none on the output. I'd put a few 100uF on both sides, but it depends on frequency of course. What are you using to drive Q1B and what frequency?
 

Offline girishv

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Re: NiMH Charger Schematic
« Reply #2 on: April 25, 2021, 06:27:56 pm »
You have no significant size capacitor on the input and none on the output. I'd put a few 100uF on both sides, but it depends on frequency of course. What are you using to drive Q1B and what frequency?

The original circuit has a 330µF and 0.1µF capacitors on input. None on the output side.

I will add 3 x 47µF capacitors on input. I am planning to use a PIC16 running at 16MHz. The ADC acquisition and conversion time will decide the switching frequency. Probably I can make provision for capacitors on output and decide on values later.
 

Offline girishv

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Re: NiMH Charger Schematic
« Reply #3 on: April 26, 2021, 01:52:26 pm »
I got a email notification saying @Le_Bassiste has posted a reply to this topic. The thread on the forum shows no such reply?

Anyone knows what is going on?
 


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