Pulse-Width Modulation
(PWM) Technology
Benefits of Delta’s Advance PWM Control:
● Advance soft switching control (available on certain models)
● Wide PWM frequency input range (30Hz-30kHz)
● Flexible speed control
● Prevent current spikes
● Low switching noise
● Low vibration
● High power efficiency
Web:
www.delta-fan.com
Email:
dcfansales.us@deltaww.com
Advanced Cooling Solutions Deliver Superior
Performance with Greater Efficiency
The PWM Advantage
PWM regulates the voltage signal between fully on
and fully off, controlling the speed of a fan. The main
advantage is that power loss in the switching device
is very low. When a switch is off, there is practically no
current, and when it is on, there is almost no voltage drop
across the switch. Therefore, power loss is close to zero.
PWM Saves Energy and Extends the Life of
Delta Fans
Delta’s thermal technology continues to provide
better performance, high reliability, and cost-effective
thermal cooling solutions. PWM is one of the primary
reasons Delta fans have a clear advantage over other
manufacturers.
Delta carries a full line of PWM speed control fans
with dimension ranging from 36x36x28mm up to
280x280x162mm.
PWM Fan Curve – Speed Characteristics
8000
7200
6800
6400
5950
5600
5100
4800
4250
4000
3400
3200
2400
1600
800
0
Speed vs PWM Control Signal:
(at rated voltage 48V; PWM signal with 3.3 VDC TTL;
Frequency: 2K Hz; Temperature: 25C)
Duty Cycle (%)
Speed
(RPM +/-10%)
Current (A)
Noise (dB-A)
100
75
50
25
0
6800
5950
5100
4250
3400
0.14
0.09
0.06
0.03
0.02
46.5
43.5
40.5
36.5
32.0
*
Above referenced part number AFB0648EH-TP27
0
10
20 25 30
40
50
60
DUTY CYCLE (%)
70 75 80
90
100
2
Pulse Width Modulation
(PWM) Technology
PWM Input Signal
Delta Advance PWM Control
Delta internally developed an advanced PWM circuit control utilizing soft switching to regulate resulting in a
smooth current signal to fan, further reducing vibration and noise.
BEFORE
AFTER
P1
P1
P2
P2
CURRENT
CURRENT
3
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