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QS3.241 Datasheet(PDF) 20 Page - PULS GmbH

Part No. QS3.241
Description  24V, 3.4A, SINGLE PHASE INPUT
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Maker  PULS [PULS GmbH]
Homepage  http://www.pulspower.com/
Logo PULS - PULS GmbH

QS3.241 Datasheet(HTML) 20 Page - PULS GmbH

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QS3.241
Q-Series
24V, 3.4A, SINGLE PHASE INPUT
23. APPLICATION NOTES
23.1. REPETITIVE PULSE LOADING
Typically, a load current is not constant and varies over time. This power supply is designed to support loads with a
higher short-term power demand (=BonusPower®). The short-term duration is hardware controlled by an output
power manager and is available on a repeated basis. If the BonusPower® load lasts longer than the hardware
controller allows it, the output voltage will dip and the next BonusPower® is available after the BonusPower® recovery
time (see chapter 6) has elapsed.
To avoid this, the following rules must be met:
a)
The power demand of the pulse must be below 150% of the nominal output power.
b)
The duration of the pulse power must be shorter than the allowed BonusPower® time. (see output section)
c)
The average (R.M.S.) output current must be below the specified continuous output current.
If the R.M.S. current is higher, the unit will respond with a thermal shut-down after a period of time. Use the
maximum duty cycle curve (Fig. 23-2) to check if the average output current is below the nominal current.
Fig. 23-1 Repetitive pulse loads, definitions
Fig. 23-2 Max. duty cycle curve
100%
P
PEAK
T
PEAK
P
0
T
0
max.
150%
150%
100
0
0.2
0.4
0.6
0.8
1.0
DutyCycle
110
120
130
140
P
PEAK
P
0 = 10%
P
0 = 50%
P
0 = 75%
P
0 = 100%
P0
Base load (W)
PPEAK Pulse load (above 100%)
T0
Duration between pulses (s)
TPEAK Pulse duration (s)
DutyCycle
T
0 =
Tpeak - (DutyCycle x Tpeak)
Tpeak + T0
Tpeak
DutyCycle =
Example:
A load is powered continuously with 40W (= 50% of the rated output load). From time to time a peak
power of 120W (= 150% of the rated output load) is needed for 1 second.
The question is: How often can this pulse be supplied without overloading the power supply?
- Make a vertical line at PPEAK = 150% and a horizontal line where the vertical line crosses the P0 = 50%
curve. Read the max. duty cycle from the duty cycle-axis (= 0.37)
- Calculate the required pause (base load) length T0:
20/25
- Result: The required pause length = 1.7s
- Max. repetition rate = pulse +pause length = 2.7s
More examples for pulse load compatibility:
PPEAK
P0
TPEAK
T0
PPEAK
P0
TPEAK
T0
120W
80W
1s
>25s
120W
40W
0.1s
>0.16s
120W
0W
1s
>1.3s
120W
40W
1s
>1.6s
100W
40W
1s
> 0.75s
120W
40W
3s
>4.9s
DutyCycle
T
0=
Tpeak - (DutyCycle x Tpeak)
0.37
1s - (0.37 x 1s)
== 1.7s
Nov. 2011 / Rev. 2.1 DS-QS3.241-EN
All parameters are specified at 24V, 3.4A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany


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