What are the advantages of linear fan control?

The principal advantage of linear control is that it is quiet. However, as we have noted, the speed-control range is limited. For example, a 12-V fan with a control voltage range from 7 V to 12 V could be running at half speed at 7 V. The situation is even worse with a 5-V fan.

Which is the best fan speed control method?

From the standpoints of acoustic noise, reliability, and power efficiency, the most preferable method of fan control is the use of high-frequency (>20 kHz) PWM drive. Besides eliminating the need for noisy pulse stretching and the commutation noise associated with low-frequency PWM, it has a much wider control range than linear control.

What are the different types of fan control?

The methods of fan control to be discussed here include: no fan control. on/off control. linear (continuous dc) control. low-frequency pulse-width modulation (PWM) high-frequency fan control.

When is the tach signal valid on a PWM fan?

With low- frequency PWM, however, the tach signal is valid only when power is applied to the fan—that is, during the on phase of the pulse. When the PWM drive is switched to the off phase, the fan’s internal tach signal-generation circuitry is also off.

What kind of display does a kingwin fan controller have?

Kingwin FPX-007 Performance 5.25” Touchscreen LCD Fan Controller Cooling with Liquid Crystal Display Module. Features Temperature Monitor, RPM Display, and Fan Fail Alarm

The methods of fan control to be discussed here include: no fan control. on/off control. linear (continuous dc) control. low-frequency pulse-width modulation (PWM) high-frequency fan control.

How is the speed of a 2 wire fan controlled?

A 2-wire fan is controlled by adjusting either the dc voltage or pulse width in low-frequency PWM. However, with only two wires, a tach signal is not readily available. This means that there is no indication as to how fast the fan is running—or indeed, if it is running at all. This form of speed control is open-loop.