CN2533611Y - Rotating speed control circuit for DC brushless motor of fan - Google Patents
Rotating speed control circuit for DC brushless motor of fan Download PDFInfo
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- CN2533611Y CN2533611Y CN02230310U CN02230310U CN2533611Y CN 2533611 Y CN2533611 Y CN 2533611Y CN 02230310 U CN02230310 U CN 02230310U CN 02230310 U CN02230310 U CN 02230310U CN 2533611 Y CN2533611 Y CN 2533611Y
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Abstract
A rotational speed control circuit of a motor with a direct current brushless fan is characterized in that the rotational speed control circuit comprises a voltage switching circuit and a voltage detecting circuit, and the voltage switching circuit is connected with the direct current power supply to control the high and low driving voltage from the output of power supply to a motor driving circuit, and the voltage detecting circuit controls the switched and output high and low driving voltage of the voltage switching circuit to a driving circuit and different conversions of rotational speed of the fan motor can be made according to different voltages of the power supply.
Description
Technical field
The utility model relates to a kind of rotating-speed control circuit of brush DC fan motor, particularly relevant for the rotating speed that utilizes voltage commutation circuit and voltage detection circuit conversion fan motor, so that look the supply voltage scope of supply and the rotary speed property scope of required rotating speed decision brush DC fan motor.
Background technology
At present fan is applied in the heat abstractor of information products such as central processing unit (CPU) on switched power supplier and the computer, presentation card.Presented a trend in recent years, the rotating speed that is exactly fan must be adjusted according to the high and low of ambient temperature.Promptly the fan under hot environment must be got rid of the heat of electronic component with high rotating speed, guaranteeing the electronic component normal operation, even avoids high temperature to destroy electronic component.In addition must reduce rotating speed at the next fan of low temperature environment, it has the saving energy on the one hand, has on the other hand to reduce electric and wind is cut noise.
Referring to Fig. 1, for commonly using the circuit diagram of drive circuit of single-phase DC brushless fan motor.Single-phase DC brushless fan motor drive circuit comprises a coil windings L1, a Hall element IC1, a driving element IC2 and a capacitor C 1.The pole change of being detected the permanent magnet of rotor by this Hall element IC1 forms faint Hall voltage, exporting this Hall voltage to driving element IC2 is also amplified, produce the square-wave signal of alternate by output 01 and 02, this signal produces the switch start and alternately changes the sense of current the motor coil winding drive circuit, so that the rotation of the rotor of excitatory CD-ROM drive motor.
Referring to Fig. 2, for commonly using the circuit diagram of drive circuit of two-phase brush DC fan motor.The drive circuit of two-phase brush DC fan motor comprises the first coil windings L1, the second coil windings L2, capacitor C 1, Hall driving element IC3, first resistance R 1, second resistance R 2 and a transistor Q1.This first resistance R 1, second resistance R 2 and transistor Q1 form the tach signal detecting circuit.The pole change of the permanent magnet of this Hall driving element IC3 detecting rotor forms faint Hall voltage, this Hall voltage is amplified through Hall driving element inside, produce the square-wave signal of alternate by output 01 and 02, this square-wave signal produces the switch start and alternately changes the sense of current at the first coil windings L1 and the second coil windings L2, so that the rotation of the rotor of the excitatory CD-ROM drive motor of coil windings.
Manufacturer utilizes two different electrical power voltage control rotation speeds of the fan usually when the design fan control circuitry.For example utilize 12V to supply with fan power supply voltage, the control rotation speed of the fan is at 3000rpm; Utilize 6V control rotation speed of the fan at 1500rpm again.Rotation speed of the fan be not both different heat radiation purpose and noise content because of system.
Referring to Fig. 3, for commonly using the rotating speed of brush DC fan motor and the schematic diagram of mains voltage variations characteristic.Between two specific high and low voltage, 12V to 6V for example, the rotating speed of brush DC fan motor and mains voltage variations characteristic belong to non-linear, and when the input supply voltage 12V of system, the stator framework of motor is set rotating speed 3000rpm; When if system changes input low supply voltage 6V, to 2000rpm, so fan motor can't be reduced to the slow-speed of revolution of 1500rpm really according to rotating speed and voltage response speed drop, also can't the required rotating speed of compliance with system.
Commonly use fan motor and be subjected to the restriction of stator framework and non-linear winding characteristic, its rotation speed change scope really the elasticity adjustment with the demand of adaptive system.In order to improve the suffered restriction of fan motor, development and Design meets the motor framework of demand rotating speed again, so then increases the development and Design cost.
Summary of the invention
The utility model main purpose provides a kind of rotating-speed control circuit of brush DC fan motor, the rotary speed property scope that it utilizes a voltage commutation circuit and a voltage detection circuit conversion fan motor makes to the utlity model has the effect that changes different motor rotary speeds.
The commentaries on classics that the utility model secondary objective provides a kind of brush DC fan motor connects control circuit, and it utilizes voltage commutation circuit decision slow-speed of revolution characteristic range, makes to the utlity model has elasticity and adjust slow-revving effect.
The utility model is achieved through the following technical solutions: a kind of rotating-speed control circuit of brush DC fan motor, it is characterized in that: this rotating-speed control circuit comprises a voltage commutation circuit and a voltage detection circuit, this voltage commutation circuit links to each other with DC power supply, and the control power supply exports the high and low driving voltage of motor drive circuit to; This voltage detection circuit is controlled the high and low driving voltage of switching output of this voltage commutation circuit to drive circuit according to high and low input supply voltage.Wherein:
This rotating-speed control circuit links to each other with single-phase DC brushless fan motor drive circuit.
This rotating-speed control circuit comprises the first transistor Q2, first resistance R 3, position resistance R 4 is formed voltage commutation circuit surely, and this rotating-speed control circuit comprises transistor seconds Q3, second resistance R 5, the 3rd resistance R 6 compositions one voltage detection circuit in addition; When transistor seconds Q3 conducting, this first transistor Q2 conducting, to motor drive circuit, motor is in high-speed state to power supply through this first transistor Q2 output high driving voltage; When this transistor seconds Q3 ended, this first transistor Q2 ended, and power supply is exported low driving voltage to motor drive circuit after these standard position resistance R 4 step-downs, and motor is in low speed state.
This second resistance R 5 and the 3rd resistance R 6 are formed bleeder circuits, and when supply voltage is increased to when fixing in advance, this transistor seconds of mat conducting Q3 switches this first transistor Q2 conducting; Reduce to when fixing in advance when supply voltage, mat switches this first transistor Q2 by this transistor seconds Q3 to be ended.
This rotating-speed control circuit links to each other with two-phase brush DC fan motor drive circuit.
This rotating-speed control circuit comprises a transistor Q2 and position resistance R 4 is as voltage commutation circuit surely, and this rotating-speed control circuit comprises second resistance R 5 in addition and the 3rd resistance R 6 is formed voltage detection circuit; When this transistor Q2 ends, the Hall driving element of this drive circuit is ground connection after these standard position resistance R 4 step-downs, and this motor is in low speed state, when this transistor Q2 conducting, this Hall driving element is ground connection behind the collection utmost point of this transistor Q2 and emitter-base bandgap grading, and this motor is in high-speed state.
This second resistance R 5 and the 3rd resistance R 6 are formed bleeder circuits, and when supply voltage is increased to when fixing in advance, this this transistor of bleeder circuit conducting Q2 makes this Hall driving element form ground connection through this transistor Q2; Reduce to when fixing in advance when supply voltage, this bleeder circuit makes this Hall driving element form ground connection behind this standard position resistance drop by this transistor Q2.
The utility model has the advantages that: the rotating-speed control circuit of this brush DC fan motor, on the basis of motor drive circuit, connect a rotating-speed control circuit, this rotating-speed control circuit comprises: a voltage commutation circuit and a voltage detection circuit; When this voltage detection circuit detecting input supply voltage was a high-tension electricity, then voltage commutation circuit was directly exported high driving voltage to this motor drive circuit, makes motor rotary speed be in fast state; When the supply voltage of this voltage detection circuit detecting input is a low-voltage, then Shu Ru power supply switches output one low driving voltage to this motor drive circuit through voltage commutation circuit, make motor rotary speed be in lower-speed state, therefore has the effect that changes different motor rotary speeds, and can utilize voltage commutation circuit decision slow-speed of revolution characteristic range, make to the utlity model has elasticity and adjust slow-revving effect.
Description of drawings
In order to allow above-mentioned purpose of the present utility model, feature and advantage understand by clearer and more definite quilt, hereinafter will be especially exemplified by the utility model preferred embodiment, and conjunction with figs. is described in detail below:
Fig. 1, for commonly using the circuit diagram of single-phase DC brushless fan motor drive circuit.
Fig. 2, for commonly using the circuit diagram of two-phase brush DC fan motor drive circuit.
Fig. 3, for commonly using the schematic diagram of brush DC fan motor rotating speed and mains voltage variations characteristic.
Fig. 4, be the framework calcspar of the utility model rotating-speed control circuit.
Fig. 5, be the rotating speed of rotating-speed control circuit of the utility model brush DC fan motor and the schematic diagram of mains voltage variations characteristic.
Fig. 6, be the circuit diagram of rotating-speed control circuit of the single-phase DC brushless fan motor of the utility model first preferred embodiment.
Fig. 7, be the circuit diagram of rotating speed control Driver Circuit of the two-phase brush DC fan motor of the utility model second preferred embodiment.
Embodiment
Referring to Fig. 4, be the framework calcspar of the utility model rotating-speed control circuit.
This rotating-speed control circuit 10 comprises a voltage commutation circuit 11 and a voltage detection circuit 12, this voltage commutation circuit 11 is in order to control the high and low driving voltage that power supply exports motor drive circuit 1 to, and 12 of this voltage detection circuits are complied with high and low input supply voltage and exported high and low driving voltage to drive circuit 1 in order to the switching of this voltage commutation circuit 11 of control start.
Fig. 5, be the rotating speed of the utility model brush DC fan motor and the schematic diagram of mains voltage variations characteristic.
Shown in Fig. 4,5, when the input high power supply voltage 12V of system, export motor drive circuit 1 to for high voltage 12V, make motor be in the high-speed state that rotating speed is 3000rpm; If when system reduces input low supply voltage X, then directly switch output LOW voltage 6V to motor drive circuit 1, make motor rotary speed reduce to 1500rPm through voltage commutation circuit 11.
Referring to Fig. 6, be applied to the circuit diagram of single-phase DC brushless fan motor for the rotating-speed control circuit of the brush DC fan motor of the utility model first preferred embodiment.Corresponding being arranged at of the single-phase DC motor driven element of this first preferred embodiment commonly used single-phase DC motor driven element, thereby adopts same reference numbers to indicate at the element same section, be easy to understand the utility model preferred embodiment and commonly use between difference.
What the part technology contents of first preferred embodiment had been disclosed in Fig. 1 commonly uses the motor drive circuit description, incorporates reference in this, will not give unnecessary details in detail.
Referring to shown in Figure 6, first preferred embodiment connects a rotating-speed control circuit 10 again on the basis of single-phase DC brushless fan motor drive circuit 1, this rotating-speed control circuit 10 comprises a transistor Q2, a resistance R 3, a resistance R 4 compositions one voltage commutation circuit 11, and this resistance R 4 belongs to position resistance (RX) surely.When this transistor Q2 ended, power supply VCC exported fan motor drive circuit 1 to after resistance R 4 step-downs.
This rotating-speed control circuit 10 comprises a transistor Q3, a resistance R 5, a resistance R 6 compositions one voltage detection circuit 12 in addition.When this transistor Q3 conducting, the base bias electric current of this transistor Q2 forms the forward bias voltage drop electric current by power supply VCC through resistance R 3 to the collection utmost point and the emitter-base bandgap grading of this transistor Q3, make this transistor Q2 conducting, therefore power supply VCC exports high driving voltage to drive circuit 1 through the emitter-base bandgap grading and the collection utmost point of this transistor Q2, at this moment, high driving voltage inputs to this drive circuit 1 and makes motor be in high-speed state (as shown in Figure 5).When this transistor Q3 ends, the collection electrode potential of this transistor Q3 raises, make the bias current of this transistor Q2 present cut-off state, cause between the emitter-base bandgap grading and the collection utmost point, opening circuit, power Vcc is exported low driving voltage to drive circuit 1 after resistance R 4 step-downs, make motor be in low speed state (as shown in Figure 5)
This resistance R 5 and R6 form bleeder circuit, and when power supply VCC voltage was increased to the accurate position of X, this bleeder circuit reached the forward accurate position (0.6V to 0.7V) of conducting of transistor Q3, and mat is controlled the conducting that this transistor Q2 is switched in this transistor Q3 conducting; Otherwise when power Vcc voltage was reduced to the accurate position of X, this bleeder circuit was lower than the forward accurate position of conducting of transistor Q3, and mat is controlled this transistor Q3 by switching ending of this transistor Q2.
Commonly use two-phase d.c. motor drive circuit referring to Fig. 7, for corresponding being arranged at of the two-phase d.c. motor drive circuit of the utility model second a preferred embodiment part, thereby adopt same reference numbers to indicate at the element same section, be easy to understand the utility model preferred embodiment and commonly use between difference.The part technology contents of second preferred embodiment has been disclosed in the description of commonly using of Fig. 2, incorporates reference in this, will not give unnecessary details in detail.
On the basis of two-phase brush DC fan motor drive circuit 1, connect a rotating-speed control circuit 10 again, this rotating-speed control circuit 10 comprises a transistor Q2 and a resistance R 4 as a voltage commutation circuit 11, this resistance R 4 belongs to position resistance [RX] surely, when this transistor Q2 ends, this Hall driving element IC3 ground connection after resistance R 4 step-downs, this drive circuit 1 makes fan motor be in low speed state (as shown in Figure 5).When this transistor Q2 conducting, this Hall driving element IC3 is ground connection behind the collection utmost point of this transistor Q2 and emitter-base bandgap grading, and this drive circuit 1 makes motor be in high-speed state (as shown in Figure 5).
This rotating-speed control circuit 10 comprises a resistance R 5 in addition, a resistance R 6 is formed a voltage detection circuit 12.This resistance R 5 and R6 form bleeder circuit, and when power supply VCC voltage is increased to certain surely during the position, this this transistor of bleeder circuit conducting Q2 makes Hall driving element IC3 form ground connection through this transistor Q2; Otherwise, reducing to certain when position surely when power supply VCC voltage, this bleeder circuit "off" transistor Q2 makes Hall driving element IC3 form ground connection after these resistance R 4 pressure drops.
Claims (7)
1, a kind of rotating-speed control circuit of brush DC fan motor, it is characterized in that: this rotating-speed control circuit comprises a voltage commutation circuit and a voltage detection circuit, this voltage commutation circuit links to each other with DC power supply, and the control power supply exports the high and low driving voltage of motor drive circuit to; This voltage detection circuit is controlled the high and low driving voltage of switching output of this voltage commutation circuit to drive circuit according to high and low input supply voltage.
2, the rotating-speed control circuit of brush DC fan motor according to claim 1 is characterized in that: this rotating-speed control circuit links to each other with single-phase DC brushless fan motor drive circuit.
3, the rotating-speed control circuit of brush DC fan motor according to claim 2, it is characterized in that: this rotating-speed control circuit comprises the first transistor Q2, first resistance R 3, position resistance R 4 is formed voltage commutation circuit surely, and this rotating-speed control circuit comprises transistor seconds Q3, second resistance R 5, the 3rd resistance R 6 compositions one voltage detection circuit in addition; When transistor seconds Q3 conducting, this first transistor Q2 conducting, to motor drive circuit, motor is in high-speed state to power supply through this first transistor Q2 output high driving voltage; When this transistor seconds Q3 ended, this first transistor Q2 ended, and power supply is exported low driving voltage to motor drive circuit after these standard position resistance R 4 step-downs, and motor is in low speed state.
4, the rotating-speed control circuit of brush DC fan motor according to claim 3, it is characterized in that: this second resistance R 5 and the 3rd resistance R 6 are formed bleeder circuit, when supply voltage is increased to when fixing in advance, this transistor seconds of mat conducting Q3 switches this first transistor Q2 conducting; Reduce to when fixing in advance when supply voltage, mat switches this first transistor Q2 by this transistor seconds Q3 to be ended.
5, the rotating-speed control circuit of brush DC fan motor according to claim 1 is characterized in that: this rotating-speed control circuit links to each other with two-phase brush DC fan motor drive circuit.
6, the rotating-speed control circuit of brush DC fan motor according to claim 5, it is characterized in that: this rotating-speed control circuit comprises a transistor Q2 and position resistance R 4 is as voltage commutation circuit surely, and this rotating-speed control circuit comprises second resistance R 5 in addition and the 3rd resistance R 6 is formed voltage detection circuit; When this transistor Q2 ends, the Hall driving element of this drive circuit is ground connection after these standard position resistance R 4 step-downs, and this motor is in low speed state, when this transistor Q2 conducting, this Hall driving element is ground connection behind the collection utmost point of this transistor Q2 and emitter-base bandgap grading, and this motor is in high-speed state.
7, the rotating-speed control circuit of brush DC fan motor according to claim 6, it is characterized in that: this second resistance R 5 and the 3rd resistance R 6 are formed bleeder circuit, when supply voltage is increased to when fixing in advance, this this transistor of bleeder circuit conducting Q2 makes this Hall driving element form ground connection through this transistor Q2; Reduce to when fixing in advance when supply voltage, this bleeder circuit makes this Hall driving element form ground connection behind this standard position resistance drop by this transistor Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02230310U CN2533611Y (en) | 2002-03-29 | 2002-03-29 | Rotating speed control circuit for DC brushless motor of fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02230310U CN2533611Y (en) | 2002-03-29 | 2002-03-29 | Rotating speed control circuit for DC brushless motor of fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2533611Y true CN2533611Y (en) | 2003-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02230310U Expired - Lifetime CN2533611Y (en) | 2002-03-29 | 2002-03-29 | Rotating speed control circuit for DC brushless motor of fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2533611Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832867A (en) * | 2011-06-14 | 2012-12-19 | 半导体元件工业有限责任公司 | Single-phase brushless motor drive circuit |
| CN105186934A (en) * | 2014-12-23 | 2015-12-23 | 西南交通大学 | Single-phase brushless direct current motor counter-rotating and counter-rotating starting control circuit |
-
2002
- 2002-03-29 CN CN02230310U patent/CN2533611Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832867A (en) * | 2011-06-14 | 2012-12-19 | 半导体元件工业有限责任公司 | Single-phase brushless motor drive circuit |
| CN102832867B (en) * | 2011-06-14 | 2015-03-11 | 半导体元件工业有限责任公司 | Single-phase brushless motor drive circuit |
| CN105186934A (en) * | 2014-12-23 | 2015-12-23 | 西南交通大学 | Single-phase brushless direct current motor counter-rotating and counter-rotating starting control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20120329 Granted publication date: 20030129 |