Ballast Design : NTC Effect

[saumya_85]

1. Without putting NTC: while measuring inrush current shows 5.3A
2. Also after NTC mount on PCB : inrush current (5.3A) as before.

There is no effect of NTC after mounting into our board.

NTC is connected in series in between AC mains and Bridge rectifier.

Could anyone suggest how to calculate value for the NTC and How NTC affects for inrush current.

 

[kak111]

These should help you..........

Inrush Current Limiters
Application notes
https://www.epcos.com/web/generator...operty=Data__en.pdf;/PDF_Applicationnotes.pdf

Inrush Current Limiters - Power Thermistors - Home
https://www.ametherm.com/inrush-current/

How To Stop Inrush Current
Use an NTC Power Thermistor
Inrush Current
https://www.ametherm.com/inrush-current/how-to-stop-inrush-current.html

Transformer Inrush Current
Use an Inrush Current Limiter
https://www.ametherm.com/inrush-current/transformer-inrush-current.html