CN100417002C

CN100417002C - Drive device of fan moter

Info

Publication number: CN100417002C
Application number: CNB2005100916409A
Authority: CN
Inventors: 林侑良; 谢宗融; 黄躍龙; 黄文喜
Original assignee: Delta Optoelectronics Inc
Current assignee: Delta Electronics Inc; Delta Optoelectronics Inc
Priority date: 2005-08-11
Filing date: 2005-08-11
Publication date: 2008-09-03
Anticipated expiration: 2025-08-11
Also published as: CN1913333A

Abstract

This invention provides a driving device for a fan motor, which is connected between a pulse width signal generator and a controller including: a converter connected to the pulse width modulation signal generator to output a first reference voltage based on the working period of a signal generated by the generator, a reference voltage generator electrically connected to an exterior supply to generate a second reference voltage, a comparator including a first input end, a second input end and an output end, said first input end is connected with the converter, the second input end is connected with the reference voltage generator, and the output is connected with the controller, when the first reference voltage is higher than the second, the output will output a modulated signal to said controller to control the rotation speed of the fan motor.

Description

The drive unit of fan motor

Technical field

The present invention is about a kind of drive unit, especially a kind of drive unit that is applied to fan motor.

Background technology

See also shown in Figure 1, known technology utilizes a controller 2 to drive a fan motor 1 at present, this controller 2 can be an integrated circuit component (IC) as shown in the figure, it has different pins for a for example Hall element 3, one temperature sensor 4, electronic circuits such as one transducer 5... connect, wherein this Hall element 3 can be obtained a phase signal to input to this controller 2 from this fan motor 1, conversion one voltage signal was to input to this controller 2 after this temperature sensor 4 can utilize a thermistor 41 detected temperatures, and this transducer 5 is then mainly in order to a pulse-width signal (the PULSE WI-DTHMODULATION with the outside input; PWM) be converted to a voltage signal to input to this controller 2.

Above-mentioned controller 2 is behind the voltage signal that receives this transducer 5 and this temperature sensor 4, can produce a drive signal to drive this fan motor 1, please consult shown in Figure 2 in addition, by distinct pulse widths modulation signal under the different temperatures input to this controller the rotation speed relation table that produces of correspondence, obviously, curve shown in this relation table is a linear relationship, so the rotating speed that this pulse-width signal input 0%-100% exported during the work period under any temperature is linearity as can be known, but in the practical application, many occasions need not carried out rotating speed when system's unlatching or system standby lifting changes; In fact, for example being giant brain is just opening or during standby, and its radiator fan promptly improves rotating speed with the rising of work period of this pulse-width signal always, and the noise of its generation makes us feeling to perplex, so necessity of its improvement is arranged.

Summary of the invention

Because the above-mentioned defective of carrying, the present invention proposes a kind of drive unit of fan motor, it can set a reference voltage level earlier for system, and this reference voltage level is corresponding to a work period reference value, magnitude of voltage after the work period conversion of this pulse-width signal of outside input is greater than this reference voltage level, then this controller beginning to after should the outside input work period do increasing on the rotating speed, if the magnitude of voltage after its conversion is less than this reference voltage level, then this controller is kept a fixedly low speed output, have lower rotating speed in the time of so can making system's unlatching or system standby, and the excessive noise of unlikely generation.

According to above-mentioned purpose, the drive unit of a kind of fan motor of the present invention, it includes: a transducer, be electrically connected to a pulse-duration modulation signal generator, this transducer can be according to the work period of the pulse-width signal that this pulse-duration modulation signal generator produced, and exports one first reference voltage; One reference voltage generator is electrically connected to an external power source, and produces one second reference voltage according to this external power source; One comparator, include a first input end, one second input and an output, this first input end is electrically connected this transducer, this second input is electrically connected this reference voltage generator, this output then is electrically connected a controller, after this first reference voltage is higher than this second reference voltage, this output export a drive signal to this controller to control the rotating speed of this fan motor, wherein this transducer is a charge-discharge circuit, and this charge-discharge circuit is made up of one first switch element, a second switch element, one the 3rd resistor and a capacitor.

For above-mentioned and other purposes of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows.

Description of drawings

Fig. 1 is the circuit diagram of known fan motor.

Fig. 2 is the performance diagram during according to the drives of Fig. 1.

Fig. 3 is the calcspar of drive unit of the present invention.

Fig. 4 is the circuit diagram of drive unit of the present invention.

Fig. 5 is the oscillogram of each reference point among Fig. 4.

Fig. 6 is the performance diagram of corresponding diagram 5.

The main element symbol description

1 fan motor, 2 controllers

3 Hall elements, 4 temperature sensors

5 transducers, 6 drive units

61 transducers, 62 reference voltage generators

63 comparators, 631 first input ends

632 second inputs, 633 outputs

7 pulse-duration modulation signal generators, 8 external power sources

S _PwmPulse-width signal V _Ref1First reference voltage

V _Ref2The second reference voltage S _DriDrive signal

R1 first resistor R 2 second resistors

R3 the 3rd resistor R 4 the 4th resistor

R5 the 5th resistor C capacitor

The Q1 first switch element Q2 second switch element

G grid D drain electrode

S source electrode P1 first reference point

The P2 second reference point P3 the 3rd reference point

Embodiment

Please refer to Fig. 3, calcspar for a preferred embodiment of the present invention, drive unit 6 of the present invention shown in the figure, it is connected electrically between a pulse-duration modulation signal generator 7 and the controller 2, and it mainly is made up of a transducer 61, a reference voltage generator 62 and a comparator 63.

This transducer 61 is electrically connected to this pulse-duration modulation signal generator 7, the pulse-width signal S that this transducer 61 can be produced according to this pulse-duration modulation signal generator 7 _PwmWork period (0%-100%), and one first corresponding reference voltage V of output _Ref1

This reference voltage generator 62 is electrically connected to an external power source 8, and it can produce one second reference voltage V according to this external power source 8 _Ref2

This comparator 63 includes a first input end 631, one second input 632 and an output 633, this first input end 631 is electrically connected to this transducer 61, this second input 632 is electrically connected to this

reference voltage generator

62, and 633 of this outputs are electrically connected to this controller 2.

As above-mentioned this first reference voltage V _Ref1Be lower than this second reference voltage V _Ref2The time, the output of the output no signal of this comparator 63, and this controller 2 keeps the fixedly low speed of this fan motor 1 voluntarily according to a low speed set point, and as this first reference voltage V _Ref1Be higher than this second reference voltage V _Ref2After, the output 633 outputs one drive signal S of this comparator 63 _DriTo this controller 2, and this controller 2 is able to according to this drive signal S _DriModulation and control the rotation speed change of this fan motor 1.

Please consult Fig. 4 again, circuit diagram for the present invention's one preferable enforcement, wherein this controller 2 can be embodied as an integrated circuit component (IC), and it has a plurality of pins and connects for electronic circuits such as a Hall element 3, a temperature sensor 4, this drive unit 6..., wherein the function of this Hall element 3 and this temperature sensor 4 in prior art, chatted and, so do not give unnecessary details in addition.

In the present embodiment, the transducer 61 of this drive unit 6 can be embodied as a charge-discharge circuit, it is mainly by one first resistor R 1, one second resistor R 2, one the 3rd resistor R 3, one capacitor C, one first a switch element Q1 and a second switch element Q2 form, wherein this first switch element Q1 and this second switch element Q2 are a transistor in present embodiment, be in particular a metal-oxide semiconductor (MOS) (MOSFET), the grid G of this first switch element Q1 is electrically connected to this pulse-duration modulation signal generator 7, and the grid G of this second switch element Q2 then is electrically connected to the drain D of this first switch element Q1; The one source pole S of the one source pole S of this first switch element Q1 and this second switch element Q2 then is electrically connected to an earth terminal jointly; One first end of this first resistor R 1 is electrically connected to this pulse-duration modulation signal generator 7 and an external power source 8, and one second end of this first resistor R 1 then is electrically connected to the drain D of this first switch element Q1; One first end of this second resistor R 2 is electrically connected to the drain D of this second switch element Q2, and one second end of this second resistance R 2 is electrically connected to one second end of the 3rd resistor R 3, and one first end of the 3rd resistor R 3 is electrically connected to this first end of this first resistor R 1; One first end of this capacitor C is electrically connected to this second end of the 3rd resistor R 3, and one second end of this capacitor C then is electrically connected to this earth terminal.

In the present embodiment, the reference voltage generator 62 of this drive unit 6 can be embodied as a voltage divider, it is made up of one the 4th resistor R 4 and one the 5th resistor R 5, wherein one first end of the 4th resistance R 4 is electrically connected to this first end of the 3rd resistor R 3, to obtain this external power source 8, one second end of the 4th resistor R 4 then is electrically connected to one first end of the 5th resistor R 5, and one second end of the 5th resistor R 5 is to be electrically connected to this earth terminal.

In the present embodiment, the comparator 63 of this drive unit 6 comprises a positive input terminal (+) (i.e. this second input 632), a negative input end (-) (i.e. this first input end 631) and an output 633, this positive input terminal (+) is electrically connected to one the 3rd reference point P3 between the 4th resistor R 4 and the 5th resistor R 5, this negative input end (-) then is electrically connected to one second reference point P2 between the 3rd resistor R 3 and this capacitor C, the output 633 of this comparator 63 then is defined as one first reference point P1 at this, and it is electrically connected to this controller 2.

Please cooperate Fig. 5 and shown in Figure 6, type of drive of the present invention is as described below:

In better embodiment of the present invention, these pulse-duration modulation signal generator 7 inputs one pulse-width signal S _PwmTo this transducer 61, and via the element characteristic of this first switch element Q1 and this second switch element Q2 so that this capacitor C is made a charging operations, and as the charge value of capacitor C (i.e. this first reference voltage level V _Ref1) to surpassing this second reference voltage level V that 62 dividing potential drops of this reference voltage generator produce _Ref2The time (just the value of this negative input end (-) of this comparator 63 is greater than the value of this positive input terminal (+)), this comparator 63 can be by this output 633 outputs one drive signal S _DriTo this fan motor 1, and make this fan motor 1 according to this drive signal S _DriSize and make the high low modulation of rotating speed.

In Fig. 5, list the oscillogram of this first reference point P1, this second reference point P2 and the 3rd reference point P3 among Fig. 4 respectively, and cooperate shown in Figure 6, this pulse-width signal S _PwmWork period by between 0% to 20%, the signal that this comparator 63 is exported is all high potential, just this controller 2 only exports this fan motor 1 to by the fixing low-speed running signal that inside sets, and make this fan motor 1 keep the running of a low speed (also can be described as the running of a base speed), only as this pulse-width signal S _PwmWork period exceeded 20%, then this comparator 63 is exported is electronegative potential, and this moment, this controller 63 can be according to this pulse-width signal S _PwmWork period so that this fan motor 1 is carried out the control of rotation speed change.

It should be noted that in addition, it keeps the output of this low-speed running signal this controller 2 in the present embodiment when high potential, and change the CRANK PULSES of exporting different rotating speeds with the variation of work period during electronegative potential into, only at this also replaceable another controller, above-mentioned control mode is oppositely to implement and make.

Anotherly it should be noted that transducer 62 of the present invention also can be embodied as an A/D conversion circuit, it also can be with this pulse-width signal S _PwmBe converted to the first reference voltage V of a numeral _Ref1, and this second reference voltage V _Ref2Also can be from the oscillating circuit of these controller 2 inside and produce.

Setting via drive unit 6 of the present invention, system end can be earlier via this reference voltage generator 62 to set a magnitude of voltage (corresponding to a predefined work period), and make this system end before the work period of this setting, keep a fixing low-speed running, thus, the rotating speed of system end when unlatching or standby can remain on low speed, and effectively reduce the generation of noise, even can reach the waste that reduces energy, so be a splendid designer.

The above only is exemplary, but not is restricted.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the claim scope that is proposed its equivalent modifications of carrying out or change.

Claims

1. the drive unit of a fan motor, it is connected electrically between a pulse-duration modulation signal generator and the controller, and this drive unit includes:

One transducer is electrically connected to this pulse-duration modulation signal generator, and this transducer is according to the work period of the pulse-width signal that this pulse-duration modulation signal generator produced, and exports one first reference voltage;

One reference voltage generator is electrically connected to an external power source, and produces one second reference voltage according to this external power source; And

One comparator, include a first input end, one second input and an output, this first input end is electrically connected this transducer, this second input is electrically connected this reference voltage generator, this output then is electrically connected this controller, after this first reference voltage is higher than this second reference voltage, this output output one drive signal that can modulate to this controller to control the rotating speed of this fan motor

Wherein this transducer is a charge-discharge circuit, and this charge-discharge circuit is made up of one first switch element, a second switch element, one the 3rd resistor and a capacitor.

2. the drive unit of fan motor as claimed in claim 1, wherein this controller is an integrated circuit.

3. the drive unit of fan motor as claimed in claim 1, wherein this controller also is electrically connected with a Hall element, and it obtains a phase signal to input to this controller from this fan motor.

4. the drive unit of fan motor as claimed in claim 1, wherein this controller also is electrically connected with a temperature sensor, and it changes output one voltage signal to this controller after detected temperatures.

5. the drive unit of fan motor as claimed in claim 1, when wherein this first reference voltage was not higher than this second reference voltage, this controller slowly ran to drive this fan motor according to a low speed set point.

6. the drive unit of fan motor as claimed in claim 1, wherein this first switch element and this second switch element are a transistor.

7. the drive unit of fan motor as claimed in claim 1, wherein a grid of this first switch element is electrically connected to this pulse-duration modulation signal generator, the one drain electrode is electrically connected to a grid of this second switch element, and the one source pole of this first switch element then is electrically connected to an earth terminal.

8. the drive unit of fan motor as claimed in claim 7, wherein one of this second switch element drain electrode is connected electrically between the 3rd resistor and this capacitor, and the one source pole of this second switch element then is electrically connected to this earth terminal.

9. the drive unit of fan motor as claimed in claim 8, wherein second input of this comparator is connected electrically between the 3rd resistor and this capacitor.

10. the drive unit of fan motor as claimed in claim 7, wherein this charge-discharge circuit also includes one first resistor, one first end of this first resistor is electrically connected to this pulse-duration modulation signal generator and this external power source, and one second end of this first resistor then is electrically connected to this drain electrode of this first switch element.

11. the drive unit of fan motor as claimed in claim 8, wherein this charge-discharge circuit also includes one second resistor, one first end of this second resistor is electrically connected to this drain electrode of this second switch element, and one second end of this second resistor then is connected electrically between the 3rd resistor and this capacitor.

12. the drive unit of fan motor as claimed in claim 1, wherein this reference voltage generator is a voltage divider, and this voltage divider is made up of one the 4th resistor and one the 5th resistor.

13. the drive unit of fan motor as claimed in claim 12, wherein one first end of the 4th resistor is electrically connected to this external power source, one second end then is electrically connected to one first end of the 5th resistor and second input of this comparator, and one second end of the 5th resistor is electrically connected to an earth terminal.

14. the drive unit of fan motor as claimed in claim 1, wherein this first input end is the negative input end of this comparator, and the positive input terminal that this second input is this comparator.