CN100424987C - Circuit for controlling fan rotating speed - Google Patents
Circuit for controlling fan rotating speed Download PDFInfo
- Publication number
- CN100424987C CN100424987C CNB031560636A CN03156063A CN100424987C CN 100424987 C CN100424987 C CN 100424987C CN B031560636 A CNB031560636 A CN B031560636A CN 03156063 A CN03156063 A CN 03156063A CN 100424987 C CN100424987 C CN 100424987C
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- circuit
- fan
- transistor
- resistance
- speed
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- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The present invention relates to a circuit for controlling the rotary speed of a fan, which comprises a driving circuit, a voltage dividing circuit and a rotary speed regulating circuit, wherein the driving circuit outputs an alternate pulse to excite coils of a fan motor for mutual conduction, the voltage dividing circuit comprises a transistor and a plurality of resistors and is connected between a voltage source and the driving circuit, and a rotary speed regulator composed of a transistor and a plurality of parallel resistors is connected between the voltage dividing circuit and the driving circuit. The fan rotary speed regulating circuit has a first current path under the first input voltage, and due to the change of the conducting state of a transistor, the rotary speed regulating circuit has a second current path under the second input voltage larger than the first input voltage. In the second path, current passes through the parallel resistors to change the conducting quantity of the driving circuit to regulate the rotary speed of a fan to a required value.
Description
Technical field
The invention provides a kind of circuit for controlling speed of fan, particularly a kind of circuit for controlling speed of fan that under each voltage-operated point, all can obtain the rotational speed regulation effect.
Background technology
Figure 1A is for showing the simple functional block diagram of existing radiator fan 100 controls.Shown in Figure 1A, radiator fan 100 is electrically connected to DC motor 102, and one drive circuit 104 is electrically connected to DC motor 102.The operating voltage of drive circuit 104 is provided by a voltage source 106, and drive circuit 104 can feed-ins one rotates signal and rotate with control DC motor 102, and this rotates signal and is generally a current signal.Radiator fan 100 is subjected to the drive of DC motor 102 and rotates, and generally speaking, radiator fan 100 is configured on the DC motor 102, so the rotating speed of radiator fan 100 is the rotating speed of DC motor 102.
In the existing fan rotary speed control system, if not in the mode of external control, just at a fixing input voltage, unique method is exactly the coil winding that changes DC motor 102, and the method is for very inconvenience of an operator.In other words, in a motor winding winding of fixing, have rotating speed and voltage relationship shown in Figure 1B.Shown in Figure 1B, relation between the input voltage of DC motor 102 and its rotating speed is to represent with a characteristic curve, for example, when the input voltage that is received when DC motor 102 was 5 volts (volt), the rotating speed of DC motor 102 runnings was 4000 rev/mins (rpm); And the input voltage that is received when DC motor 102 is when being 3 volts (volt), and the rotating speed of DC motor 102 runnings is 2500 rev/mins (rpm); If a user desires to require the rotating speed of motor to be required to be 3000 rev/mins (rpm) when 4 volts of input voltages, 102 of DC motor can't be reached.
The conventional fan motor can't fixedly further change its rotating speed under the input voltage value one from the above.Therefore, a kind of as if designing at the control circuit that all can change the rotation speed of the fan under this voltage under arbitrary input voltage on demand, can significantly increase the elasticity in the application.
Summary of the invention
Therefore, purpose of the present invention is providing a kind of circuit for controlling speed of fan, and it can be at the rotation speed of the fan that all can change on demand under arbitrary input voltage under this voltage.
According to the present invention, a kind of circuit for controlling speed of fan is characterized in that: described circuit for controlling speed of fan comprises:
One drive circuit, the output alternating impulse is with the mutual conducting of the coil that excites a fan motor;
One bleeder circuit comprises a first transistor and a plurality of resistor, is connected between a voltage source and a speed regulator;
And described speed regulator comprises a transistor seconds and a plurality of resistors in parallel, and it is connected between described bleeder circuit and described drive circuit;
The electric current of described circuit for controlling speed of fan one first path of passing through under one first input voltage of described voltage source wherein, and under one second input voltage greater than described first input voltage, indivedual conducting states of described the first transistor and described transistor seconds change, make the electric current of described circuit for controlling speed of fan one second path of passing through, when described electric current is passed through described second path by described a plurality of resistorss in parallel, the conducting amount that makes described drive circuit changes according to the resistance of described resistors in parallel, uses rotating speed to a requirements of adjusting fan.
The present invention also provides a kind of circuit for controlling speed of fan in addition, it is characterized in that: described circuit for controlling speed of fan comprises:
One drive circuit, the output alternating impulse is with the mutual conducting of the coil that excites a fan motor;
One bleeder circuit comprises a first transistor and a plurality of resistor, be connected between a voltage source and a speed regulator, and described speed regulator comprises a transistor seconds and a variable resistance, and it is connected between described bleeder circuit and described drive circuit;
The electric current of described circuit for controlling speed of fan one first path of passing through under one first input voltage of described voltage source wherein, and under one second input voltage greater than described first input voltage, indivedual conducting states of described the first transistor and described transistor seconds change, make the electric current of described circuit for controlling speed of fan one second path of passing through, when described electric current is passed through described second path by described variable resistance, the conducting amount that makes described drive circuit changes according to the resistance of described variable resistance, uses rotating speed to a requirements of adjusting fan.
Utilize the collocation of bleeder circuit and speed regulator by the present invention, can utilize transistorized conducting or open-circuit condition in the resistance design change bleeder circuit, make electric current pass through different paths to change the characteristic line of voltage to rotating speed, simultaneously utilize speed regulator to make the changing of conducting volume production of fan drive circuit again, and can obtain under each different voltage-operated point, rotation speed of the fan to be adjusted to the multistage speed changing effect of requirements.
Also have, speed regulator also can be a variable resistance, and it is adjustable to change the effect of rotating speed to obtain resistance equally.
Description of drawings
Figure 1A is for showing the simple functional block diagram of existing radiator fan control.
Figure 1B is the input voltage of the general fan motor of demonstration and the graph of a relation of rotating speed.
Fig. 2 is a circuit blocks figure, shows an embodiment of circuit for controlling speed of fan of the present invention.
Fig. 3 shows the physical circuit configuration according to circuit for controlling speed of fan of the present invention.
Fig. 4 is the graph of a relation of an input voltage and motor speed, to show the multistage speed changing effect of circuit for controlling speed of fan of the present invention.
Fig. 5 is a circuit blocks figure, shows the configuration variation example of speed regulator of the present invention.
Fig. 6 is a circuit blocks figure, shows another embodiment of circuit for controlling speed of fan of the present invention.
Embodiment
Fig. 2 is a circuit blocks figure, shows an embodiment of circuit for controlling speed of fan 10 of the present invention.As shown in Figure 2, circuit for controlling speed of fan 10 comprises a bleeder circuit 12, drive IC 14 and a speed regulator 16.Drive IC 14 inside are main framework with the logical circuit, and one input end connects Hall element 20, to trigger the output output alternating impulse of drive IC 14, the coil 18 mutual conductings of energizes motor.
Fig. 3 shows an example of circuit for controlling speed of fan 10 physical circuit configurations of the present invention.As shown in Figure 3, bleeder circuit 12 comprises transistor Q1 and resistance R 1 to R4, and speed regulator 16 is made of transistor Q2 and a plurality of resistors, for example illustrated a plurality of resistors in parallel R5, R6 and R7.Drive IC 14 inside have the logical circuit of H electric bridge and transistor formation, and the input IN of Hall element 20 electrical connection drive IC 14, and drive IC 14 can be detected the pole change of fans by Hall element 20, and drives signal to coil 18 by output output.
As shown in Figure 3, resistance R 1 is connected in voltage source V
CCAnd between the grid of transistor Q1, resistance R 2 is connected between the grid and ground of transistor Q1, and resistance R 3 is connected in voltage source V
CCAnd between the drain electrode of transistor Q1, resistance R 4 is connected between the drain electrode and ground of transistor Q1.Its grid of transistor Q2 of speed regulator 16 is connected to the drain electrode of transistor Q1 and simultaneously via resistance R 4 ground connection, and the source ground of transistor Q2.Resistance R 1, R2 and resistance R 3, R4 constitute the bleeder circuit of the transistor Q2 of the transistor Q1 of bleeder circuit 12 and speed regulator 16 respectively, conducting or the open-circuit condition of its resistance size decision transistor Q1 and Q2.Speed regulator 16 connects the earth terminal GND of drive IC 14 simultaneously.
By this circuit design, the present invention can following mode of operation reach fan multistage speed changing effect.
At first work as voltage source V
CCImport a magnitude of voltage for example 3 volts the time, because of resistance R 1 to R4 size design makes not conducting of transistor Q1 transistor Q2 conducting, this moment, current path was the voltage source V of flowing through
CC, drive IC 14, conducting transistor Q2 after, without a plurality of resistors in parallel R5, R6 and R7 and flow directly into ground.Then, when improving voltage source V
CCRated voltage, for example when the rated voltage that applies reaches 5 volts, the design of original resistance R 1 to R4 size makes transistor Q1 conducting this moment and not conducting of transistor Q2, so current path transfers to by voltage source V
CCAfter drive IC 14, process a plurality of parallel resistance R5, R6 and R7 be inflow surface again.
Please refer to Fig. 4, the above-mentioned different current paths that produce by the transistor turns state variation, make fan motor can have characteristic line T1 and the T2 of different voltage simultaneously to rotating speed, rotation speed of the fan can be changed between different voltage is to the characteristic line T1 of rotating speed and T2, and obtain the effect of multistage speed change.Specifically, when input voltage is 3 volts, the voltage of the current path correspondence of this moment is the T1 line to the characteristic line of rotating speed, make 3 voltaism pressing elements that for example rotation speed of the fan value of 2500 rev/mins (rpm) be arranged, when input voltage increases to 5 volts, make electric current pass through another path because of the transistor turns state variation this moment, the voltage of the current path correspondence of this moment is the T2 line to the characteristic line of rotating speed, makes 5 voltaism pressing elements 5500 rev/mins rotation speed of the fan value (A2 point) for example be arranged but not 4000 rev/mins (A1 points) of T1 line.Then, a therefore current path a plurality of resistorss in parallel of speed regulator 16 of flowing through, speed regulator 16 can be brought into play the effect of regulating rotating speed at this moment, makes rotation speed of the fan be adjusted to a desirable value.According to the way of present embodiment, a plurality of resistorss in parallel are made of parallel resistance R5 for example shown in Figure 3, R6, R7, by the quantity or the resistance size that change resistor, the electric current that enters drive IC is changed and change rotating speed under this voltage.For example, when reducing the quantity of parallel resistance, the whole equivalent resistance of speed regulator promptly increases the electric current that makes the drive IC of flowing through and reduces, and can make rotation speed of the fan produce the variation that reduces by A2 o'clock to a required rotating speed A2 ' as shown in Figure 4.The quantity and the size of parallel resistance do not limit, and are allocated and look required rotation speed of the fan fully.
Therefore, the present invention utilizes the collocation design of bleeder circuit 12 and speed regulator 16, can utilize the resistance design of resistance R 1 to R4 to change the transistor Q1 of bleeder circuit 12 and both conductings of transistor Q2 or the open-circuit condition of speed regulator 16, make electric current pass through different paths to change the characteristic line of voltage to rotating speed, simultaneously utilize a plurality of resistorss in parallel of speed regulator 16 to make the changing of conducting volume production of fan drive circuit again, and can obtain under each different voltage-operated point, rotation speed of the fan to be adjusted to the multistage speed changing effect of requirements.Moreover the resistor of speed regulator is not defined as by a plurality of parallel resistances and is constituted, and it is adjustable to change the effect of rotating speed for example to adopt a variable resistance can obtain resistance equally.
Fig. 6 shows the circuit for controlling speed of fan 30 according to another embodiment of the present invention.The present invention can be used in equally with pulse-width modulation (Pulse Width Modulation; PWM) fan under the voltage control, the pwm signal elder generation that only pwm signal generation unit 22 need be exported is resent to drive IC 14 through speed regulator 16 and gets final product.When drive IC 14 based on pwm signal, output drive signal is during to coil 18, speed regulator 16 can change the conducting amount of drive IC 14 equally and obtain the effect of multistage speed change.
The above only is exemplary, but not is restriction the present invention.Anyly do not break away from spirit of the present invention and category, and, all should be included in appended Shen claims its equivalent modifications of carrying out or change.
Claims (9)
1. circuit for controlling speed of fan, it is characterized in that: described circuit for controlling speed of fan comprises:
One drive circuit is exported an alternating impulse with the mutual conducting of the coil that excites a fan motor;
One bleeder circuit comprises a first transistor and a plurality of resistor, is connected between a voltage source and a speed regulator;
And described speed regulator comprises a transistor seconds and a plurality of resistors in parallel, and it is connected between described bleeder circuit and described drive circuit;
The electric current of described circuit for controlling speed of fan one first path of passing through under one first input voltage of described voltage source wherein, and under one second input voltage greater than described first input voltage, indivedual conducting states of described the first transistor and described transistor seconds change, make the electric current of described circuit for controlling speed of fan one second path of passing through, when described electric current is passed through described second path by described a plurality of resistorss in parallel, the conducting amount that makes described drive circuit changes according to the resistance of described resistors in parallel, uses rotating speed to a requirements of adjusting fan.
2. circuit for controlling speed of fan as claimed in claim 1 is characterized in that: a plurality of resistors of described bleeder circuit comprise:
One first resistance is connected between the grid and a voltage source of described the first transistor;
One second resistance is connected between the grid and ground of described the first transistor;
One the 3rd resistance is connected between the drain electrode and described voltage source of described the first transistor; And
One the 4th resistance is connected between the drain electrode and ground of described the first transistor.
3. circuit for controlling speed of fan as claimed in claim 2 is characterized in that: described transistor seconds is connected between the drain electrode and ground of described the first transistor, and the grid of described transistor seconds connects described the 4th resistance.
4. circuit for controlling speed of fan as claimed in claim 1 is characterized in that: be built in a drive IC in the described drive circuit, described drive IC is provided with a first terminal and connects described voltage source, and one second terminal ground connection.
5. circuit for controlling speed of fan as claimed in claim 4 is characterized in that: described speed regulator is electrically connected on the described the first terminal of described drive IC or described second terminal of described drive IC.
6. circuit for controlling speed of fan as claimed in claim 4 is characterized in that: described drive IC more comprises an input and connects a Hall element, to trigger described drive IC output alternating impulse to excite the mutual conducting of described coil.
7. circuit for controlling speed of fan as claimed in claim 1 is characterized in that: described circuit for controlling speed of fan further comprises a pulse-width modulation signal generation unit, and described pulse-width modulation signal generation unit is electrically connected to described speed regulator.
8. circuit for controlling speed of fan, it is characterized in that: described circuit for controlling speed of fan comprises:
One drive circuit, the output alternating impulse is with the mutual conducting of the coil that excites a fan motor;
One bleeder circuit comprises a first transistor and a plurality of resistor, is connected between a voltage source and a speed regulator,
And described speed regulator comprises a transistor seconds and a variable resistance, and it is connected between described bleeder circuit and described drive circuit;
The electric current of described circuit for controlling speed of fan one first path of passing through under one first input voltage of described voltage source wherein, and under one second input voltage greater than described first input voltage, indivedual conducting states of described the first transistor and described transistor seconds change, make the electric current of described circuit for controlling speed of fan one second path of passing through, when described electric current is passed through described second path by described variable resistance, the conducting amount that makes described drive circuit changes according to the resistance of described variable resistance, uses rotating speed to a requirements of adjusting fan.
9. circuit for controlling speed of fan as claimed in claim 8 is characterized in that: described a plurality of resistors of described bleeder circuit comprise:
One first resistance is connected between the grid and a voltage source of described the first transistor;
One second resistance is connected between the grid and ground of described the first transistor;
One the 3rd resistance is connected between the drain electrode and described voltage source of described the first transistor; And
One the 4th resistance is connected between the drain electrode and ground of described the first transistor;
Wherein said transistor seconds is connected between the drain electrode and ground of described the first transistor, and the grid of described transistor seconds connects described the 4th resistance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031560636A CN100424987C (en) | 2003-08-29 | 2003-08-29 | Circuit for controlling fan rotating speed |
| CNA2006101629247A CN1956315A (en) | 2003-08-29 | 2003-08-29 | Circuit for controlling speed of fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031560636A CN100424987C (en) | 2003-08-29 | 2003-08-29 | Circuit for controlling fan rotating speed |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101629247A Division CN1956315A (en) | 2003-08-29 | 2003-08-29 | Circuit for controlling speed of fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1592082A CN1592082A (en) | 2005-03-09 |
| CN100424987C true CN100424987C (en) | 2008-10-08 |
Family
ID=34598297
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101629247A Pending CN1956315A (en) | 2003-08-29 | 2003-08-29 | Circuit for controlling speed of fan |
| CNB031560636A Expired - Lifetime CN100424987C (en) | 2003-08-29 | 2003-08-29 | Circuit for controlling fan rotating speed |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101629247A Pending CN1956315A (en) | 2003-08-29 | 2003-08-29 | Circuit for controlling speed of fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN1956315A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4588350B2 (en) * | 2004-04-12 | 2010-12-01 | 三菱電機株式会社 | Blower |
| CN102916629B (en) * | 2006-05-23 | 2016-04-06 | 台达电子工业股份有限公司 | Fan system |
| CN101771319B (en) * | 2008-12-31 | 2012-07-04 | 台达电子工业股份有限公司 | Brushless DC motor and drive unit thereof |
| CN102801375B (en) * | 2011-05-23 | 2015-02-25 | 台达电子工业股份有限公司 | Ventilation device with feedback compensation control and operation method thereof |
| TWI472147B (en) * | 2011-08-03 | 2015-02-01 | Sunonwealth Electr Mach Ind Co | Fan speed control circuit |
| TWI554025B (en) * | 2012-04-05 | 2016-10-11 | 立錡科技股份有限公司 | Fan motor driver, pwm duty control method thereof and fan motor control circuit based thereon |
| CN109962662B (en) * | 2017-12-14 | 2020-12-04 | 保音股份有限公司 | Motor rotation speed correcting device and method for water heater |
| CN108562775B (en) * | 2018-04-19 | 2020-11-10 | 阳光电源股份有限公司 | Electric vehicle motor control system and current detection correction method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1236108A (en) * | 1998-05-14 | 1999-11-24 | 谢新茂 | DC brushless fan checking circuit |
| CN2404267Y (en) * | 1999-12-15 | 2000-11-01 | 奇鋐股份有限公司 | Automatic regulating speed driving electric circuit for fan |
-
2003
- 2003-08-29 CN CNA2006101629247A patent/CN1956315A/en active Pending
- 2003-08-29 CN CNB031560636A patent/CN100424987C/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1236108A (en) * | 1998-05-14 | 1999-11-24 | 谢新茂 | DC brushless fan checking circuit |
| CN2404267Y (en) * | 1999-12-15 | 2000-11-01 | 奇鋐股份有限公司 | Automatic regulating speed driving electric circuit for fan |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1956315A (en) | 2007-05-02 |
| CN1592082A (en) | 2005-03-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Delta Electronics (Dongguan) Co.,Ltd. Assignor: DELTA ELECTRONICS, Inc. Contract record no.: 2011990000747 Denomination of invention: Fan rotating speed contral circuit Granted publication date: 20081008 License type: Exclusive License Open date: 20050309 Record date: 20110803 |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081008 |