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Pulse Width Modulation (PWM) fan speed control methodology pulse-width modulates a fan's full-rated power supply voltage at a low frequency, typically 30 Hz. A typical PWM circuit, consisting of a transistor in series with a fan, can be small and inexpensive because it is either fully...

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...of the cooling fan(s) inside the NLX power supply. The NLX specification designates two interface fan control signals: 1. FanM signal is an output from the NLX-compliant power supply. This signal allows the host (typically a system management ASIC) to monitor fan RPM. FanM is an open-collector signal...

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...of a few years, technological and other developments have made thermal cooling necessary for many applications, thus requiring the development of a new system management category: thermal management.This article discusses an integrated fan speed solution that provides sophisticated speed control...

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Brushless DC fan (BDC) speed can be varied using pulse-width modulation (PWM). The typical PWM control scheme inserts a power switch in series with the fan, as shown in Figure 1. In such applications, an increase in the active duty cycle causes a corresponding increase in fan speed (i.e., fan speed...

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Microchip's TC642, TC643, and TC646 are the world's first integrated circuits dedicated for controlling and monitoring fan speed. The new family of fan speed controllers modulate fan speed to compensate for changes in system temperature. This means the fan runs at full speed only when necessary...

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On-off fan controls aren't ideal for all applications. Lift trucks and skid loaders, for example, tend to cycle on-off clutches more frequently because such vehicles always need some amount of engine-fan cooling. Two-speed fan clutches work better in these applications. Such clutches have embedded...

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Fans are typically tested and rated in prescribed test configurations defined by the Air Movement and Control Association. This is. done to ensure standardized procedures and ratings so that system designers can make realistic choices among various manufacturers. Beyond the routine system...

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To access the manual fan speed control, you have to press the Set button three times. The first two button presses bypass the controls for setting the hour and minute on the clock. Because most users will set their clock only once, this is a ridiculous design flaw. And though the GateWatch's front panel...

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speed control dial slides into a free PCI expansion bay. Like most systems we tested, we had to remove the motherboard from the case to install the water block s screw posts. The installation went mostly flawlessly and took approximately 20 minutes. The Aquagate S1 s radiator and fan assembly wouldn...

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AN1175 Sensorless Brushless DC Motor Control with PIC16 MOTOR CONTROL Author: Joseph Julicher Dieter Peter BLDC motor control consists of two parts. Part 1 is Microchip Technology Inc. commutating the motor at the most efficient rate. Part 2 is regulating the speed of the motor within defined...

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