NiMH Charger Schematic

[girishv]

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?

[Pineapple Dan]

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?

[girishv]

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.

[girishv]

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?