Pulse Width Modulation (PWM) Technology
Pulse Width Modulation (PWM) Technology Advanced Cooling Solutions Deliver Superior Performance and Greater Efficiency 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.
Internal vs. External PWM Control Delta’s internal PWM signal control fans deliver a variety of advantages over external PWMcontrolled devices: • Wide PWM frequency range input (30Hz-30kHz) • Lower vibration at lower duty cycle • Prevent spike current on fan speed control • Better motor efficiency • Lower fan switching noise
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 Control
Internal PWM Fan Curve vs. External PWM Fan Curve 4000
RPM
3500
Full
3000
RPM
2500 2000 1500
0
100% Duty Cycle
1000 500 0
10
Duty cycle (%)
20
30
40
50
60
70
Blue: NEW DESIGN AFB0912VH-SP03 ( 4 wires) Orange: External control AFB0912VH-F00
80
90
100
Wide PWM frequency range input (30Hz-30kHz) means lower vibration and less noise.
Fan Speed Control Function Vcc Red Wire
Tach Signal Input
Control Chip
Blue Wire
(EX: ADT7463)
PWM Signal Output
Yellow Wire
Delta PWM Control Fan
System
Black Wire GND
Delta’s internal PWM signal control delivers a clear advantage over external PWM controls. The PWM function is commonly used in OEM cases. Delta also provides standard PWM through distribution channels. Selected PWM models are available from Delta. If you would like to find out more, please contact your nearest distributor or contact us at [email protected].
4405 Cushing Parkway | Fremont, CA 94538 tel. 1.888.979.9889 | www.delta-americas.com
© 2011 Delta Products Corporation. All Rights Reserved. Delta PWM Technology - 08/11
Internal vs. External PWM Control Delta’s internal PWM signal control fans deliver a variety of advantages over external PWMcontrolled devices: • Wide PWM frequency range input (30Hz-30kHz) • Lower vibration at lower duty cycle • Prevent spike current on fan speed control • Better motor efficiency • Lower fan switching noise
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 Control
Internal PWM Fan Curve vs. External PWM Fan Curve 4000
RPM
3500
Full
3000
RPM
2500 2000 1500
0
100% Duty Cycle
1000 500 0
10
Duty cycle (%)
20
30
40
50
60
70
Blue: NEW DESIGN AFB0912VH-SP03 ( 4 wires) Orange: External control AFB0912VH-F00
80
90
100
Wide PWM frequency range input (30Hz-30kHz) means lower vibration and less noise.
Fan Speed Control Function Vcc Red Wire
Tach Signal Input
Control Chip
Blue Wire
(EX: ADT7463)
PWM Signal Output
Yellow Wire
Delta PWM Control Fan
System
Black Wire GND
Delta’s internal PWM signal control delivers a clear advantage over external PWM controls. The PWM function is commonly used in OEM cases. Delta also provides standard PWM through distribution channels. Selected PWM models are available from Delta. If you would like to find out more, please contact your nearest distributor or contact us at [email protected].
4405 Cushing Parkway | Fremont, CA 94538 tel. 1.888.979.9889 | www.delta-americas.com
© 2011 Delta Products Corporation. All Rights Reserved. Delta PWM Technology - 08/11
