CN2472412Y - Speed controller for small fan - Google Patents

Abstract

The utility model relates to a cruise control device of a miniature fan, which comprises a full speed controller and a clock pulse generator; wherein, the full speed controller comprises a timing master pulser, a signal comparator, a driver and a signal generator; the clock pulse generator is arranged on the full speed controller and generates a certain frequency to be compared with the timing signals generated by the timing master pulser and then transferred back to the timing master pulser in order to correct the output signals of the cruise control device, and drive the coils of the fan by the driver to achieve the cruise control of the fan. The utility model can make the small fan have a stable rotational speed, and eliminate the unbalanced states caused by different frictions and temperatures of new and old fans and other reasons.

Description

The control device in constant speed of small-sized fans

The utility model relates to a kind of control device in constant speed of small-sized fans, is meant especially a kind ofly to guarantee that the small-sized fans rotating speed is maintained at the control device in constant speed of stable state all the time.

Small-sized fans is the common used in industry articles for use, the central processing unit heat abstractor of for example various main frame inside, just bound small-sized fans.With heat abstractor, the small-sized fans of its use is higher relatively on every performance requirement, and also there is improved space really in existing small-sized fans on performance, and the technological layer that involves comprises fan loop itself and control circuit part, and relevant problem and shortcoming are as follows:

One. rotation speed of the fan RPM value can't be grasped, that is rotating speed control problem.Main cause is as follows:

1. the frictional force difference between the new and old product of fan: the clean frictional force between new fan shaft and stator bearing is big, causes rotation speed of the fan to be not so good as expection; And old fan causes frictional force to increase because of the lubricating oil volatilization of stator bearing, also influences preset rotation speed.

2. the influence of working temperature: comprise the change of lubricating oil stickiness, coil is subjected to temperatures involved and improves resistance, causes rotating speed to reduce; Temperature also will cause the expansion of rotating shaft and bearing and influence its rotating speed RPM value again, and its mutual influence is very complicated, and be difficult to control.

3. the system impedance of operational environment influence (fine pressure).

Two. fan quantity in stock problem: owing to the requirement difference of different utilization fields for rotation speed of the fan/frequency, and the rotating speed of small-sized fans (RPM) is (sees also following formula shown in) relevant with magnetic pole (POLE) number of poles:

$f=\frac{1}{t}$ T=k * R * C N: electrode number of poles

So different rotating speed requirements, the fan that promptly must make different numbers of poles, different coil turns satisfies, and therefore for the fan producer, promptly causes very big warehousing pressure.

In fact,, still select the wire rod of different labels for use,, also be difficult to constitute the identical fan of rotating speed based on the requirement difference of different wire rods for line footpath error and composition because of each tame manufacturer even with identical number of magnetic poles and identical wire circle.

Three. can't satisfy does not have the requirement that the joint rotating speed is adjusted: existing small-sized fans all only possesses about 5 sections rotating speed adjustment to be selected for the user, can't satisfy and not have the demand that the joint rotating speed is adjusted.

From the above, existing small-sized fans causes the problem that can't grasp the RPM tachometer value because of factors such as change in friction force, working temperature, materials, in addition, also can't effectively satisfy and not have the requirement that joint is adjusted rotating speed, so remain further to be studied, and seek feasible solution.

Main purpose of the present utility model is to provide a kind of and guarantees that the small-sized fans rotating speed is maintained at the control device in constant speed of stable state all the time.

The purpose of this utility model is achieved in that

A kind of control device in constant speed of small-sized fans, be provided with a frequency input on the controller at full speed one, the frequency input is provided with a clock pulse generator, can set to produce a fixed frequency value, to revise the output signal of control device in constant speed, make fan reach the purpose of constant speed control.Wherein controller comprises at full speed:

One timing main pulse device is used for receiving the hall sensing signal, obtains the real-time rotating speed of fan with detection;

One driver is controlled by above-mentioned timing master device output signal, to drive the fan loop that its output is connected;

One signal comparator, its input connects the timing signal that the timing master device is sent, its reference edge is provided with a clock pulse generator, output then tieback to the timing master device, wherein: the reference signal of signal comparator is the fixed frequency value of setting by clock pulse generator, compare in order to timing signal, send the timing master device again back to, so that be located at fan loop on its output by driver drives with timing master device output;

In above-mentioned design, the timing master device exports the timing signal of driver to, be controlled by signal comparator, can make small-sized fans be maintained at the rotation speed operation of setting by this, and get rid of the rotating speed balance phenomenon that is caused because of new and old product fan frictional force difference, temperature and other factor.

Above-mentioned clock pulse generator is to be made of the RC circuit, utilizes the time constant that changes resistance (R), electric capacity (C), and provides signal comparator one reference frequency value.

Above-mentioned clock pulse generator can be made of various oscillator.

Above-mentioned cruise control includes a signal generator (FG), and it is connected in the output of timing master device.

Above-mentioned output end of driver connects two group fan loops.

Above-mentioned output end of driver connects single fan loop.

Above-mentioned full speed controller can be implemented with the integrated circuit form.

The utility model possesses following advantage at least:

1. effectively grasp the rotating speed RPM value of small-sized fans: the utility model can constantly be revised through the fixed frequency value of setting with one when fan running, make its purpose that can reach constant speed, and effectively improve the shortcoming that fan commonly used can't effectively be grasped its rotating speed RPM value.

2. be not subjected to the influence of the new and old product of fan: when rotation speed of the fan changes because of change in friction force,, can make it restore to the rotating speed of setting, and be maintained at this rotation speed operation by above-mentioned correction measure.

3. be not subjected to working temperature or wire rod differentia influence: it changes because of the rotating speed that working temperature or wire rod difference are caused, and still can be improved because of above-mentioned correction measure.

4. reduction warehousing pressure: utilize aforesaid way need only make the fan of single specification, cooperate clock pulse generator to be set in not specific rotation speeds again, can meet different rotating speed requirements, so can reduce warehousing pressure and operation costs.

5. can reach does not have the purpose that joint is adjusted rotating speed: utilize control device in constant speed of the present utility model to reach not have and to save the purpose of adjusting rotating speed by the condition transformation of clock pulse generator.

Below, details are as follows to structure of the present utility model with embodiment with reference to the accompanying drawings:

Fig. 1: circuit square frame johning knot composition of the present utility model.Fig. 2: the user mode reference diagram of the utility model one preferred embodiment.Fig. 3: the user mode reference diagram of another preferred embodiment of the utility model.

Number in the figure explanation: 100: full speed controller 10: timing master device 20: driver 30: signal comparator 40: signal generator 50: clock pulse generator

Relevant full speed controller 100 of the present utility model sees also shown in Figure 1ly, and it includes:

One timing main pulse device 10 for receiving the hall sensing signal, is obtained the real-time rotating speed of fan with detection;

One driver 20 is controlled by the timing signal of above-mentioned timing master device 10 outputs, to drive the fan loop (this is not shown in the figures) that its output connects;

One signal comparator 30, its input are to provide timing signal by timing master device 10, and its reference edge is to provide a fixing frequency signal by the outside, output then tieback to timing master device 10;

One signal generator 40 (FG), its input is connected to the output of timing master device 10, in order to produce a pulse signal, for external detection usefulness, wherein:

Timing master device 10 is to connect a hall sensing assembly with input Hin, utilizes the hall sensing assembly to survey the pole change of fan, and changes it according to this and export driver 20 to, to change pole polarity.Timing master device 10 commonly used is the detectable signals according to the hall sensing assembly, directly change output pulse signal, the utility model then shilling its output signal is delivered to signal comparator 30, compare with the fixed frequency value of setting earlier, and the output signal that produces a process correction according to this is recycled to timing master device 10, produce one group of signal by timing master device 10 again and deliver to driver 20, the rotation speed operation that the fan that its output is connected can be stable to set.

Driver 20 is that oneself of fan control circuitry knows assembly, and its output can be for connecting two groups or small-sized fans that single group coil constituted.

Signal comparator 30 is the primary clusterings as the rotating speed correction, in the present embodiment, its reference edge is to constitute a frequency input Fin, be connected with a clock pulse generator 50 on it, utilize this clock pulse generator 50 to produce one group of fixing frequency values, compare for the timing signal of sending with timing master device 10, as previously described, the timing signal of timing master device 10 outputs is to survey the variation of fan pole polarity according to the hall sensing assembly to produce, it represents the actual speed of fan, the frequency signal that clock pulse generator 50 produces then is the tachometer value of setting or user's expected value, therefore, when the user sets a specific frequency values by clock pulse generator 50, promptly set the specific rotation speeds of fan simultaneously in a correspondence, so when the fan real-world operation, will constantly revise actual speed, and make it keep rotation speed operation to set by signal comparator 30.

In addition, because the output signal of above-mentioned full speed controller 100 is to get by the time constant that changes clock pulse generator 50, so utilizing this characteristic can utilize this signal comparator 30 to cooperate clock pulse generator 50 to change imposes a condition, can reach the purpose that resets rotating speed, and further can reach the purpose of not having joint adjustment rotating speed.

From the above, clock pulse generator 50 is in order to produce a signal relevant with time constant, therefore this clock pulse generator 50 can be made of arbitrary assembly or device that produces timing or oscillator signal, such as RC circuit, quartz (controlled) oscillator, ceramic resonator, SAW surface wave oscillation component and equivalent elements thereof.

Above-mentioned full speed controller 100 can be implemented with the integrated circuit form.

Can find out physical circuit structure of the present utility model by above-mentioned explanation, details are as follows as for its feasible embodiment:

At first see also shown in Figure 2, above-mentioned full speed controller 100 is used in the use embodiment of twisted pair line circle fan, this full speed controller 100 is ends that are connected to two groups of coil L1, L2 with two output O1, O2 respectively, two coil L1, L2 end in addition then connect power supply VCC, in present embodiment, controller 100 external clock pulse generators 50 are to be made of a RC circuit at full speed, by changing the time constant of this RC circuit, can adjust the rotating speed of fan.

And for example shown in Figure 3, be the use embodiment that above-mentioned full speed controller 100 is used in single coil fan, this full speed controller 100 is the two ends that connect a coil L with two output O1, O2 respectively, in the present embodiment, controller 100 external clock pulse generators 50 still are made of a RC circuit at full speed.

Claims (9)

1. the control device in constant speed of a small-sized fans, it is characterized in that being provided with a frequency input on the controller at full speed one, the frequency input is provided with one can set generation one fixed frequency value, to revise the output signal of constant speed control circuit, make fan reach the clock pulse generator of constant speed control purpose.

2. as the control device in constant speed of 1 described small-sized fans of claim the, it is characterized in that described full speed controller comprises:

One is used for receiving the hall sensing signal, obtains the timing master device of the real-time rotating speed of fan with detection;

One controlled by above-mentioned timing master device output signal, to drive the driver of the fan loop that its output connected;

One its input connects the timing signal that timing master device is sent, and its reference edge constitutes a frequency input, connecting clock pulse generator, output then tieback to the signal comparator of timing master device.

3. as the control device in constant speed of 1 described small-sized fans of claim the, it is characterized in that described clock pulse generator is to be made of the RC circuit.

4. as the control device in constant speed of 1 described small-sized fans of claim the, it is characterized in that described clock pulse generator is to be made of oscillator.

5. as the control device in constant speed of 4 described small-sized fanses of claim the, it is characterized in that described oscillator is to be made of quartz (controlled) oscillator, ceramic resonator or SAW surface wave oscillation component.

6. as the control device in constant speed of 1,2 described small-sized fanses of claim the, it is characterized in that the output of described timing master device is connected with a signal generator (FG) again.

7. as the control device in constant speed of 1,2 described small-sized fanses of claim the, it is characterized in that described output end of driver connects two group fan loops.

8. as the control device in constant speed of 1,2 described small-sized fanses of claim the, it is characterized in that described output end of driver connects single fan loop.

9. as the control device in constant speed of 1,2 described small-sized fanses of claim the, it is characterized in that described full speed controller uses integrated circuit.

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