What is an input inrush current?
An input inrush current is a current surge at the input of a power supply that occurs when the input capacitors are charged after the input voltage is applied. The inrush current must be kept to a minimum.
There are several methods of restricting the input inrush current in industrial power supplies:
- NTC thermistors
- Fixed resistors
- Trailing edge phase control
- Pulse charging of the input capacitor
In power supplies with an NTC input inrush current limiter, this current pulse can be very high and may cause fuses and circuit breakers to trip. PULS uses trailing edge phase control in many of its DIMENSION C series power supplies and pulse charging in the DIMENSION Q series.
