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Pulse width modulation fan control

A pulse width modulation, fan control technology, applied in temperature control, control system, motor speed or torque control, etc., can solve problems such as unsatisfactory power consumption, waste, limited number of fans with different speeds, etc.

Inactive Publication Date: 2014-01-22
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

While this solution is feasible, it is not ideal from a power consumption standpoint
Specifically, the described solution is wasteful because the same amount of power is required to drive the fan regardless of the speed at which it is operating
A further disadvantage of the described solution is that the range of operating speeds of the fan is limited under this control scheme and the number of different speeds the fan can operate within said range is also limited

Method used

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  • Pulse width modulation fan control
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Examples

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Embodiment Construction

[0012] As mentioned above, microprocessor control of cooling fans is not ideal for some computer applications. For example, microprocessors may not be suitable for cooling computer power supplies because of the high cost of microprocessors providing such control. Although different solutions exist, such as using power dissipation devices to reduce the voltage applied to the fan, these solutions are also not ideal because they waste power and do not provide high-precision speed control over a wide range. However, as described below, precise fan control over a wide range of speeds can be provided at low cost using pulse width modulation (PWM) controlled fans.

[0013] In one embodiment, a control circuit is used to generate a PWM signal and provide it to a fan controlled by PWM. The control circuit generates PWM signals based on a number of input signals it receives from various components in the fan-equipped computer. More specifically, the control circuitry receives feedback...

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Abstract

Pulse Width Modulation Fan Control In one embodiment, the fan control system (102) includes: a temperature sensor (108) adapted to detect component temperature and output a temperature feedback signal; and a pulse width modulation control circuit (106) that It is configured to receive the temperature feedback signal output by the temperature sensor and the separate fan command signal, and generate a pulse width modulation signal based on these signals, which is sent to the pulse width modulation controlled fan.

Description

technical field [0001] The present invention relates to fan control systems. Background technique [0002] The various components used in a computer generate heat, and in order for the components to function properly, heat must be dissipated. The heat generated by these computer components is typically dissipated by using fans to draw or force ambient air through the components. To reduce power consumption and noise generation, the speed of these fans is adjusted according to the needs of the fan-equipped computer. For example, the speed of a given fan may be controlled based on the temperature of the component that the fan is equipped to cool. In some cases, federal regulations require that a given component not exceed a specified operating temperature. [0003] Some cooling fans used in computers are controlled by microprocessors. While microprocessor control has advantages in terms of precision in regulating fan speed, microprocessor control is not suitable for every ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D23/19G05D23/24H02P7/00H02P5/00G06F1/20
CPCH05K7/20209
Inventor G·F·斯奎布
Owner HEWLETT PACKARD DEV CO LP
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