Repeated pulse load

Typically a load current is not constant and varies with time. This power supply is designed to support loads with a higher short-term power demand (extra power). The short-term duration is hardware-controlled by an output power manager and is available repeatedly. If the extra power load lasts longer than the hardware controller allows, the output voltage drops. Extra power is available again after the extra power recovery time has elapsed (see Output chapter).

To avoid this, the following conditions must be met:

Repeated pulse load 1:
Repeated pulse loads, definitions; Max. duty cycle curve

Key

 

P0

Base load (W)

PPEAK

Pulse load (over 100%)

T0

Duration between pulses (s)

TPEAK

Pulse duration (s)

Calculation:

Duty cycle = TPEAK / (TPEAK + T0)

T0 = (TPEAK - (DutyCycle x TPEAK)) / DutyCycle

Example:

A load is operated continuously with 240 W (= 50% of the nominal output load).
From time to time a peak power of 720 W (= 150% of the nominal output load) is required for 1 second.

T0 = (TPEAK - (DutyCycle x TPEAK)) / DutyCycle = (1 s - (0.37 x 1 s)) / 0.37 = 1.7 s

Further examples of pulse load tolerance

PPEAK

P0

TPEAK

T0

720 W

480 W

1 s

>25 s

720 W

0 W

1 s

>1.3 s

600 W

240 W

1 s

> 0.75 s

720 W

240 W

0.1 s

>0.16 s

720 W

240 W

1 s

>1.6 s

720 W

240 W

3 s

>4.9 s