CN201113875Y - DC brushless fan two-way control circuit - Google Patents
DC brushless fan two-way control circuit Download PDFInfo
- Publication number
- CN201113875Y CN201113875Y CNU2007201217853U CN200720121785U CN201113875Y CN 201113875 Y CN201113875 Y CN 201113875Y CN U2007201217853 U CNU2007201217853 U CN U2007201217853U CN 200720121785 U CN200720121785 U CN 200720121785U CN 201113875 Y CN201113875 Y CN 201113875Y
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- mcu
- hall sensing
- circuit
- sensing element
- fan
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Abstract
The utility model discloses a bidirectional control circuit for a direct current brushless fan and particularly relates to a bidirectional control circuit for a direct current brushless fan which consists of an MCU and a Hall sensing element and controls the positive and reverse rotation of a direct current brushless fan. The circuit is provided with one Hall sensing element (1), an electronic switch is arranged in the MCU, and the output end of the Hall sensing element (1) is connected with one end of the electronic switch arranged in the MCU. Only one Hall sensing element is adopted, so the use ratio of the element can be increased further to correspondingly decrease the cost; the Hall sensing element only occupies one or two MCU interfaces, so the demand of the MCU interfaces can be reduced compared with the prior art further to decrease the cost of the MCU; the electronic switch of the MCU and a time-delay circuit are arranged inside the MCU, thereby also decreasing the cost of the circuit and reducing the arrangement space for the circuit.
Description
Technical field
The utility model relates to the two-way control circuit of a kind of brush DC fan, relates in particular to the two-way control circuit of brush DC fan of being made of the positive and negative rotation of control brush DC fan MCU and hall sensing element.
Background technology
Because of science and technology constantly develops, in existing heat dissipation technology, need the hold concurrently radiator fan of the air draught and the dual-use function of drying of a kind of radiating requirements thing relatively.In having the existing brush-less fan technology of this dual-use function,, two hall sensing elements are set in circuit, position of magnetic pole when a detecting turns clockwise, the counterclockwise position of magnetic pole of detecting because of detecting position of magnetic pole needs.
Externally import after the control signal its fan of control clockwise or be rotated counterclockwise.
In the clockwise or counterclockwise method of its control method one is arranged: between two hall sensing elements and external control signal, seal in an electronic switch, by the signal output of two hall sensing elements of external control signal control, and then the rotating of control fan.
Method two: as publication number is the Chinese invention patent of CN1901335 a kind of " two-way single phase fan and motor thereof " by name, send its switch element of a signal controlling after receiving its external direction control signal by a microprocessing unit, and then control one of the two hall sensing elements work of this fan, its the hall sensing element that should work the period sends an induced signal to microprocessing unit and determines this fan direction of rotation, microprocessing unit is exported fans drive signal to a delay cell thereupon, its delay cell is in order to prevent that fan from changing rotation direction and the electric current that is short-circuited, and the drive signal after delayed transfers to drive circuit again.
Drawing the above method according to practical effect has many not enough points, as follows:
As described in method one, control its two hall sensings element work with electronic switch, its electronic switch is many to be formed by transistor fabrication, when it is closed in season, there is a low potential difference at its switch ends place, promptly be difficult to reach thoroughly close, and then make its hall sensing element that should close be in little operating state, so that the mutual interference of two hall sensing interelement phases makes its fan have potential safety hazard.
As after the employing microprocessing unit control switch unit as described in the method two and then control two hall sensing elements, the signal that two hall sensing element is exported after controlling inserts its microprocessing unit.Two hall sensing element inserts microprocessing unit and needs two interfaces at least, needs four interfaces at most, and the interface requirements amount of used microprocessing unit is increased; Because of adopting two hall sensing elements, in its hall sensing element, need establish two signal amplifiers at least, so can strengthen its microprocessing unit memory space demand; In addition, its switch element, delay cell all are located at outside the microprocessing unit, so can increase circuit cost and arrangement space; And adopt two hall sensing elements respectively to its fan clockwise or when being rotated counterclockwise position of magnetic pole detect, the element utilance is reduced; Described before combining, its fan cost is increased.
The utility model content
Above deficiency in view of prior art, the purpose of the utility model design is: provide a kind of brush DC fan two-way control circuit, this control circuit only has a hall sensing element, magnetic pole testing that this hall sensing element can be responsible for clockwise simultaneously and counter clockwise direction turns round, increase the service efficiency of element, and remove the problem that occurs phase mutual interference between two hall sensing elements in the running simultaneously from.
For achieving the above object, the utility model has adopted following technical scheme:
Design the two-way control circuit of a kind of brush DC fan, form by hall sensing element and MCU.The quantity of this hall sensing element is one, is provided with electronic switch in its MCU, and described hall sensing element output is connected with an end of set electronic switch in the MCU.
Also be provided with a time-delay piece in the above-mentioned MCU, this time-delay piece is connected with the electronic switch other end, and this time-delay piece can prevent that fan directional change moment subsequent conditioning circuit from being that drive circuit can't cut out and cause drive circuit and the interior sense of current conflict of coil that drive circuit is damaged immediately.
The two-way control circuit of above-mentioned brush DC fan also comprises an external control signal converting circuit, its external direction control signal is input MCU electronic switch controling end after external control signal converting circuit conversion, external direction control signal after this conversion is controlled the inner set electronic switch of its MCU, and then determines its fan running direction.This external control signal converting circuit can prevent unsettled external control signal, can disturb its inner normal and stable operation when directly adding MCU.
One signal amplifier is set in the above-mentioned MCU, and its hall sensing element output inserts set signal amplifier in the MCU, inserts an end of set electronic switch behind signal amplifier again; Whether this signal amplifier is set, and is to decide according to the size of hall sensing element power, when employed hall sensing element power hour, the hall sensing signal relatively a little less than, signal amplifier then can amplify this induced signal, guarantees signal stabilization, ensures that circuit working is reliable.
The signal of hall sensing element output is through importing a drive signal to the piece of delaying time behind the signal amplifier after external direction control signal control in electronic switch, after drive circuit cuts out fully, its drive signal is transferred to drive circuit, export drive coil to through drive circuit again and carry out electromagnetic conversion, and then drive the rotor rotation.
During use, MCU establishes fan acquiescence rotation direction, promptly when external direction control signal is given tacit consent to or do not had input state its fan is established an acquiescence rotation direction.When its external direction control signal no signal input or extraneous signal were default value, electronic switch was failure to actuate in the MCU, and its fan is along setting in advance the direction rotation.When at external direction control signal input one signal opposite with default value, electronic switch action in its MCU, the signal phase of the drive signal that inputs to drive circuit through MCU during with default direction is opposite, and then current opposite in direction in the drive coil, to rotor is rotated in the opposite direction.
After adopting as above design, the beneficial effects of the utility model are:
Owing to only adopt a hall sensing element, can increase the element utilization rate, and then corresponding reducing cost.Its hall sensing element only takies one or two in the MCU interface, carry compared to existing technology and can reduce MCU interface requirements amount, and then reduced the cost of MCU, as with prior art in use the MCU of same interface quantity, then can increase the function quantity that its fan is realized; Owing to its electronic switch and delay circuit are located at MCU inside, thereby have also reduced circuit cost and reduced the circuit arrangement space.
Description of drawings
Fig. 1 is the utility model circuit block diagram.
Fig. 2 is the circuit diagram of the utility model first embodiment.
Fig. 3 is the circuit diagram of the utility model second embodiment.
Number in the figure is as follows:
1 hall sensing element 2MCU
3 drive circuits, 5 drive coils
The external direction control signal of 4 external control signal converting circuit A
Embodiment
Below in conjunction with accompanying drawing, execution mode of the present utility model is described in further detail.
Embodiment one
As shown in Figure 1, 2.
The utility model circuit comprises a hall sensing element (1), a MCU (2), an external control signal converting circuit (4), one drive circuit (3), a fans drive coil (5);
Also be provided with an electronic switch, a time-delay piece in the MCU (2), a signal amplifier.
Its hall sensing element (1) adopts bipod output induced signal to the interior set signal amplifier of MCU (2), insert an end of set electronic switch behind signal amplifier, its external direction control signal (A) is imported in the MCU (2) after external control signal converting circuit (4) conversion.External direction control signal (A) after this conversion is controlled the inner set electronic switch of its MCU (2), and then determines its fan running direction.
MCU (2) the internal electron switch other end inserts a time-delay piece, and its time-delay piece then is to cause sense of current conflict that drive circuit (3) damaged in the moment of external direction control signal (A) change fan directional because of closing its drive circuit (3) immediately in order to prevent.
The signal of its hall sensing element (1) output is after its internal signal amplifier amplifies its induced signal, after by the external direction control signal (A) of external control signal converting circuit (4) input MCU (2) it being amplified induced signal and controls decision fan running direction, by signal lag again by two output pin output drive signals to drive circuit (3), export drive coil (5) to through drive circuit (3) again and carry out electromagnetic conversion, its fan is turned round according to demand direction.
If external direction control signal (A) is for low level or do not have its default direction running of fan photograph of when input; It is identical with drive signal initial phase angle on two interfaces that exported to drive circuit (3) by MCU (2) by the induced signal initial phase angle that hall sensing element (1) inputs on two interfaces of MCU (2) that other establishes this moment.So when its external direction control signal (A) is high level, its hall sensing element (1) inputs to the initial phase angle of the induced signal on two interfaces of MCU (2) and all corresponding 180 degree that differ of drive signal initial phase angle on two interfaces that exported to drive circuit (3) by MCU (2), and its fan is with the opposite direction running of default direction.
Embodiment two
As shown in Figure 3.
Repeat no more with embodiment one something in common, difference mainly is:
The used hall sensing element of the two-way control circuit of brush DC fan (1) adopts pin output induced signal to MCU (2), by an output pin output drive signal to drive circuit (3) its fan is turned round according to demand direction again by signal lag through the external direction control signal (A) of its external control signal converting circuit (4) input MCU (2) is controlled decision fan running direction to its induced signal after.
If external direction control signal (A) is for low level or do not have its default direction running of fan photograph of when input; It is identical with drive signal initial phase angle on the interface that is exported to drive circuit (3) by MCU (2) by the induced signal initial phase angle that hall sensing element (1) inputs on the interface of MCU (2) that other establishes this moment.So when its external direction control signal (A) is high level, its hall sensing element (1) inputs to the initial phase angle of the induced signal on the interface of MCU (2) and differs 180 degree with drive signal initial phase angle on the interface that is exported to drive circuit (3) by MCU (2), and its fan is with the opposite direction running of default direction.
Certainly, motor drive circuit described in the utility model can be a drive circuit in bi-directional, also can be single-phase drive circuit; In the time of in the utility model as also need increasing other function,, can establish controll block in addition by MCU described in the utility model to realize, also can in control circuit, increase its fan specific IC in addition to be controlled realization as overcurrent protection etc.; All drop among the protection range of the present utility model with up conversion.
Claims (6)
1. two-way control circuit of brush DC fan, form by hall sensing element and MCU, it is characterized in that: the quantity of this hall sensing element (1) is one, is provided with electronic switch in its MCU, and described hall sensing element (1) output is connected with an end of set electronic switch in the MCU.
2. the two-way control circuit of a kind of brush DC fan according to claim 1 is characterized in that: be provided with a time-delay piece in the described MCU, this time-delay piece is connected with the electronic switch other end.
3. the two-way control circuit of a kind of brush DC fan according to claim 1, it is characterized in that: the two-way control circuit of described brush DC fan also comprises an external control signal converting circuit (4), and its external direction control signal is input MCU electronic switch controling end after external control signal converting circuit (4) conversion.
4. the two-way control circuit of a kind of brush DC fan according to claim 1, it is characterized in that: a signal amplifier is set in the described MCU, its hall sensing element (1) output inserts set signal amplifier in the MCU, inserts an end of set electronic switch behind signal amplifier again.
5. the two-way control circuit of a kind of brush DC fan according to claim 2, it is characterized in that: described time-delay piece can be provided in a side of in the MCU, also can be to use the delay circuit that is made of resolution element.
6. the two-way control circuit of a kind of brush DC fan according to claim 4, it is characterized in that: described signal amplifier can be provided in a side of in the MCU, also can be the amplifying circuit that is made of resolution element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201217853U CN201113875Y (en) | 2007-07-27 | 2007-07-27 | DC brushless fan two-way control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201217853U CN201113875Y (en) | 2007-07-27 | 2007-07-27 | DC brushless fan two-way control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201113875Y true CN201113875Y (en) | 2008-09-10 |
Family
ID=39965623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201217853U Expired - Fee Related CN201113875Y (en) | 2007-07-27 | 2007-07-27 | DC brushless fan two-way control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201113875Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012155335A1 (en) * | 2011-05-17 | 2012-11-22 | 中山大洋电机制造有限公司 | Forward-backward rotating circuit for direct-current brushless motor |
-
2007
- 2007-07-27 CN CNU2007201217853U patent/CN201113875Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012155335A1 (en) * | 2011-05-17 | 2012-11-22 | 中山大洋电机制造有限公司 | Forward-backward rotating circuit for direct-current brushless motor |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 Termination date: 20130727 |