American Megatrends MegaPro Driver
AMI provides a number of support options for its BIOS products, both for its Developer Customers and End Users of AMI's BIOS and UEFI firmware g: MegaPro. Recent AMI MegaPro Motherboard questions, problems & answers. Free expert DIY tips, support, troubleshooting help & repair. Award/AMI BIOS numbers with their corresponding motherboards manufacturers. Total Peripherals MegaPro D (produced by Veridata).
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American Megatrends MegaPro Driver
There is no rotating commutator or brush assembly as with traditional DC motors.
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Consequently, much fewer dust particles are generated which, if shed, may contaminate the equipment. There are fewer parts to wear out, and there is much less ignition noise than with a brush assembly. Furthermore, the magnetic coils of a BLDC motor are mounted on a rigid frame which improves the thermal dissipation of the motor and provides for greater American Megatrends MegaPro integrity of the motor.
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BLDC fan motors are also much more electrically quiet than other kinds of motors previously used. Despite all of these advantages, BLDC motors typically still wear out faster than the electronic systems they are included to protect. Mainly, such wear-out is caused by a failure of the bearings supporting the rotor assembly. Also, American Megatrends MegaPro fan generates acoustic noise which may be ergonomically displeasing to an operator of equipment incorporating such a fan.
Likewise, as with all fans, the fan may become blocked by foreign matter, or filters included in the air flow path generated by the fan may become increasingly clogged with particulate matter which American Megatrends MegaPro in a higher strain on the motor driving the fan, and ultimately, an inability of the fan to American Megatrends MegaPro the air flow for which the system was designed. To reduce the detrimental aspects of using BLDC fans, fan-speed management has proven useful to drive such fans only when needed and only at a speed sufficiently useful to cool the system within which the fan is incorporated.
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Such fan-speed management results in less acoustic noise, either because the fan is totally off at certain times or is throttled to a American Megatrends MegaPro lower speed for a typical operation than its maximum speed which is only driven in a worst-case cooling demand. By throttling back the power of a BLDC fan, significant power dissipation is also saved, which is particularly important in battery-powered systems.
In its simplest implementation, such fans may be turned fully on or fully off. This technique is effective when the fan is unnecessary for American Megatrends MegaPro operating conditions and may, therefore, be left off except in the most unusual circumstances. Nonetheless, such control has its drawbacks.
For example, when the fan is on, it usually runs at full speed, in which case the acoustic noise is at its worst. Furthermore, if the temperature of the system hovers near the threshold temperatures, a displeasing frequent cycling of the fan may occur as the temperature is driven below the second threshold and allowed to rise above the first threshold with frequent cycling of the power to the fan. In many systems, a temperature proportional cooling method has been devised to variably increase the speed of a cooling fan as a function of the heat generation or the temperature of American Megatrends MegaPro system to be protected.
One method of controlling the speed of a brushless DC motor is to regulate the voltage powering the motor to a lower voltage than the nominal operating voltage that the motor is normally specified to require. Referring now to FIG. A variable control voltage, indicated in the figure as a variable voltage 44, is applied to the control terminal of transistor 41 and the American Megatrends MegaPro is amplified by transistor 42, and yet again, by transistor 43, to provide on the power terminal 45 of the BLDC motor 40 a substantially fixed voltage which is a function of the control voltage Raising the control voltage 44 similarly raises the voltage applied to terminal 45, which is usually about 1.
The current drawn through BLDC motor 40 is generally proportional to the voltage applied across the motor. For example, if the American Megatrends MegaPro drawn by BLDC motor 40 at 12 volts is milliamps, the current drawn through the BLDC motor 40 will usually be approximately milliamps if terminal 45 is instead controlled to a 6-volt level.
The linear voltage regulator circuit shown in FIG. It provides for a fan speed decrease which is almost linear with decreasing voltage. However, the power dissipation in the voltage regulator itself is substantial. At low fan speeds, the American Megatrends MegaPro dissipation of the regulator circuit may actually exceed the power consumed by the fan.
This suggests large transistors may be necessary, and external heat sinks may need to be provided to dissipate the heat generated by such a large amount of current flowing through a circuit with a large voltage drop across the same circuit. Generating all of American Megatrends MegaPro additional heat seems counter-productive to the purpose of having the fan incorporated within the system in the first place.
Consequently, such a linear voltage regulator fan-speed control has found decreasing use in recent years. Nonetheless, such a circuit does extend fan life if the system is designed to rarely require the fan to operate at full speed. Likewise, American Megatrends MegaPro the fan in this fashion may reduce acoustic noise typically generated by the system.
Another method of controlling the speed of a brushless DC motor involves chopping the power to intermittently apply full power to the motor at certain times, and applying no power to the motor at other times. This is usually accomplished with a relatively low-frequency Hz pulse-width-modulated PWM signal. One terminal of the BLDC motor may be connected to one power supply, and the other terminal may be connected to ground through a power switching device which is driven appropriately by the PWM signal. The American Megatrends MegaPro of transistor 50 is generated by a pulse-width-modulated signal generator 51, which is responding to a control signal for controlling the speed of the BLDC motor
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