CN107182184B - Fan device with brake - Google Patents
Fan device with brake Download PDFInfo
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- CN107182184B CN107182184B CN201610136722.9A CN201610136722A CN107182184B CN 107182184 B CN107182184 B CN 107182184B CN 201610136722 A CN201610136722 A CN 201610136722A CN 107182184 B CN107182184 B CN 107182184B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/2019—Fan safe systems, e.g. mechanical devices for non stop cooling
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- Stopping Of Electric Motors (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
A fan device with a brake comprises a fan motor, a brake unit and a control unit. The fan motor is provided with a first end and a second end, and when the brake unit does not receive the brake inhibition signal output by the control unit, the brake is started, so that the first end and the second end of the fan motor are grounded to generate a short-circuit brake effect; and when the brake unit receives the brake inhibiting signal, the first end and the second end of the fan motor are not grounded, so that the short-circuit brake effect is not generated.
Description
Technical Field
The present invention relates to a fan device, and more particularly, to a fan device with a brake.
Background
As the performance and processing speed of electronic devices are increased, and the integration of electronic components is increased, the heat dissipation requirement is increased, but in the past, fans are often installed in electronic devices for heat dissipation. The existing fan comprises a brake circuit, so as to provide a brake mechanism for decelerating or stopping in real time when the fan runs by inertia; however, the conventional braking circuit has the disadvantage that the braking function of the braking circuit cannot be performed when the transistor (such as mosfet) of the driving circuit of the fan is damaged or when the micro-control unit is damaged.
In particular, the related art server system mostly employs multiple fans to help cool; when one of the fans is damaged, the damaged fan is easily blown to be reversely rotated by other fans which normally work, so that the server system generates air leakage and the heat dissipation effect is poor; therefore, it is an important subject to continuously provide a braking function when the fan is damaged, for example, to prevent the server system from generating air leakage.
Disclosure of Invention
To overcome the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a fan device with a brake, which includes: a fan motor having a first end and a second end; a driving unit electrically connected to the first end and the second end of the fan motor for driving the fan motor according to a driving signal; a brake unit electrically connected to the driving unit and the first end and the second end of the fan motor, respectively; and a control unit, electrically connected to the driving unit and the braking unit, respectively, for outputting the driving signal and a braking suppressing signal; when the brake unit receives the brake inhibiting signal, the first end and the second end are not grounded, and the brake is not started; otherwise, when the brake unit does not receive the brake inhibiting signal, the first end and the second end are grounded to start braking.
Furthermore, in an embodiment, the fan device with braking further includes a power unit electrically connected to the braking unit, the power unit provides a dc voltage to the braking unit, and when the braking unit does not receive the braking suppressing signal, the dc voltage grounds the first end and the second end to start braking.
Furthermore, in an embodiment, the fan apparatus with brake as described above, wherein the control unit does not transmit the brake suppressing signal to the brake unit when the control unit is damaged.
In an embodiment, the fan device with brake further includes a detecting unit electrically connected to the control unit to detect a rotation state of the fan motor and generate a first detecting signal to be transmitted to the control unit, and when the control unit knows that the fan motor does not rotate according to the first detecting signal, the control unit does not transmit the brake inhibiting signal to the brake unit.
Furthermore, in an embodiment, the fan apparatus with brake as described above, wherein the detecting unit includes: the first Hall element is electrically connected to the control unit so as to detect the rotation state of the fan motor and generate a first detection signal to be transmitted to the control unit; and the second Hall element is electrically connected to the control unit so as to detect the rotation state of the fan motor and generate a second detection signal to be transmitted to the control unit.
Furthermore, in an embodiment, in the fan device with brake as described above, the first hall element and the second hall element are respectively disposed at different positions relative to the fan motor, so that the first detection signal and the second detection signal generate a phase difference, and the control unit determines whether the fan motor is in forward operation or reverse operation according to the phase difference; when the fan motor runs reversely, the control unit does not transmit the suppression brake signal to the brake unit.
Furthermore, in an embodiment, the fan apparatus with brake as described above, wherein the phase difference is between 30 ° and 90 °.
Furthermore, in an embodiment, the fan apparatus with brake as described above, wherein when the fan motor is running forward, the first detection signal leads the second detection signal; when the fan motor runs reversely, the first detection signal lags behind the second detection signal.
In another embodiment, in the fan device with brake described above, the control unit transmits the brake inhibiting signal to the brake unit to release the braking effect of the brake unit on the fan motor, and then outputs the driving signal to the driving unit to drive the fan motor to start to operate.
In another embodiment, in the fan device with brake described above, when the braking action of the fan motor is started, the control unit stops outputting the driving signal to the driving unit to stop the fan motor, and then stops outputting the braking inhibiting signal to the braking unit to brake the fan motor.
In an embodiment, in the fan apparatus with brake as described above, the driving unit includes a first driving switch, a second driving switch, a third driving switch and a fourth driving switch, and the first driving switch, the second driving switch, the third driving switch and the fourth driving switch are respectively electrically connected to the control unit.
Furthermore, in an embodiment, the fan apparatus with brake as described above, wherein the brake unit includes: a first brake switch, a second brake switch, a first resistor, a second resistor, a third brake switch, a fourth brake switch, a third resistor and a fourth resistor; the control unit is electrically connected with the first end of the first brake switch and the first end of the second brake switch respectively; one end of the first resistor is electrically connected to the second end of the first brake switch, the other end of the first resistor is electrically connected to one end of the third resistor and the first end of the third brake switch, and the other end of the third resistor is electrically connected to the power supply unit; one end of the second resistor is electrically connected to the first end of the second brake switch, the other end of the second resistor is electrically connected to one end of the fourth resistor and the first end of the fourth brake switch, and the other end of the fourth resistor is electrically connected to the power supply unit.
Furthermore, in an embodiment, in the fan device with brake as described above, a second end of the third brake switch is electrically connected to the first end of the fan motor and the first driving switch and the second driving switch of the driving unit; a second end of the fourth brake switch is electrically connected to the second end of the fan motor and the third and fourth driving switches of the driving unit; and the third end of the first brake switch, the third end of the second brake switch, the third end of the third brake switch and the third end of the fourth brake switch are all grounded respectively.
Furthermore, in an embodiment, the fan apparatus with brake as described above, wherein the brake unit includes: the control unit is electrically connected with a first end of the first brake switch and a first end of the second brake switch respectively; the second end of the first brake switch is electrically connected with the third end of the first relay, one end of the first resistor is electrically connected with the second end of the first relay, and the other end of the first resistor is electrically connected with the power supply unit; the second end of the second brake switch is electrically connected to the third end of the second relay, one end of the second resistor is electrically connected to the second end of the second relay, and the other end of the second resistor is electrically connected to the power supply unit.
Furthermore, in an embodiment, in the fan device with brake as described above, a first end of the first relay is electrically connected to the first end of the fan motor and the first driving switch and the second driving switch of the driving unit; the first end of the second relay is electrically connected with the second end of the fan motor and the third driving switch and the fourth driving switch of the driving unit; and the third end of the first brake switch, the third end of the second brake switch, the first end of the first relay and the first end of the second relay are respectively grounded.
The invention has the technical effect that when the fan motor is damaged, the brake effect on the fan motor can be continuously generated.
Drawings
FIG. 1 is a block diagram of a fan apparatus according to the present invention.
Fig. 2 is a schematic diagram illustrating relative positions of the first hall element and the second hall element in the fan motor.
FIG. 3 is a timing diagram of the first and second detection signals when the fan motor is running in the forward direction.
FIG. 4 is a timing diagram of the first and second detection signals when the fan motor is running in reverse.
FIG. 5 is a timing diagram of the suppressing brake signal and the driving signal outputted from the control unit according to the present invention.
FIG. 6 is a circuit diagram of a fan apparatus according to a first embodiment of the present invention.
FIG. 7 is a circuit diagram of a fan apparatus according to a second embodiment of the present invention.
Description of reference numerals:
1 … fan device
10 … fan motor
11 … first end
12 … second end
20 … drive unit
21 … first driving switch
22 … second drive switch
23 … third driving switch
24 … fourth drive switch
30 … control unit
31 … suppressing brake signal
32 … drive signal
40 … brake unit
401 … first brake switch
402 … second brake switch
403 … third brake switch
404 … fourth brake switch
405 … first resistor
406 … second resistor
407 … third resistor
408 fourth resistor 408 …
409 … first relay
410 … second relay
50 … Power supply Unit
51 … DC voltage
60 … detection cell
61 … first Hall element
611 … first detection signal
62 … second Hall element
621 … second detection signal
Detailed Description
For a detailed description and technical contents of the present invention, reference is made to the following detailed description and accompanying drawings, which are provided for illustrative purposes only and are not intended to limit the present invention.
Please refer to fig. 1, which is a block diagram of a fan apparatus according to the present invention. The fan apparatus 1 includes a fan motor 10, a driving unit 20, a control unit 30 (such as a Microcontroller, MCU), a braking unit 40, a power supply unit 50, and a detecting unit 60. Wherein the driving unit 20 is electrically connected to the fan motor 10, the control unit 30, the braking unit 40 and the power supply unit 50; the braking unit 40 is electrically connected to the control unit 30 and the power supply unit 50 respectively; the control unit 30 is electrically connected to the detection unit 60.
The fan motor 10 includes at least one coil (not shown) having a first end 11 and a second end 12, the first end 11 and the second end 12 being electrically connected to two ends of the driving unit 20, respectively; when the first end 11 and the second end 12 are short-circuited, the fan motor 10 generates a braking effect; when the first end 11 and the second end 12 are both grounded (corresponding to the short circuit between the first end 11 and the second end 12), the fan motor 10 also generates the short circuit brake effect. The braking unit 40 of the present invention is used to make the first terminal 11 and the second terminal 12 grounded or not grounded to generate or not generate short-circuit braking.
The detecting unit 60 includes a first hall element 61 and a second hall element 62, please refer to fig. 2, fig. 2 is a schematic diagram of relative positions of the first hall element 61 and the second hall element 62 on the fan motor 10, wherein the first hall element 61 is electrically connected to the control unit 30 for detecting a rotation state of the fan motor 10 and generating a first detecting signal 611 to be transmitted to the control unit 30; the second hall element 62 is also electrically connected to the control unit 30 for detecting the rotation state of the fan motor 10 and generating a second detection signal 621 to be transmitted to the control unit 30. The first detection signal and the second detection signal can be phase signals, and in order to generate a phase difference between the first detection signal 611 and the second detection signal 621, the fan motor 10 can be determined to be in forward operation or reverse operation by the phase difference of the detection signals, therefore, the first hall element 61 and the second hall element 62 are respectively disposed at different positions relative to the fan motor 10, and the phase difference can be designed to be between 30 ° and 90 °.
The driving unit 20 includes a bridge circuit, which may be a full-bridge circuit, and in this embodiment includes a first driving switch 21, a second driving switch 22, a third driving switch 23 and a fourth driving switch 24, and the driving switches may be MOSFETs; the first driving switch 21, the second driving switch 22, the third driving switch 23 and the fourth driving switch 24 are electrically connected to the control unit 30, and the control unit 30 outputs at least one driving signal 32 to control the first driving switch 21, the second driving switch 22, the third driving switch 23 and the fourth driving switch 24 to be turned on and off in turn to drive the fan motor 10 to operate.
The power unit 50 is used for transmitting a DC voltage 51 to the braking unit 40 and the driving unit 20; the two ends of the braking unit 40 are electrically connected to the first end 11 and the second end 12 of the coil of the fan motor 10, respectively, and when the braking unit 40 does not receive the braking suppressing signal 31 sent by the control unit 30, the braking mechanism is started by the direct-current voltage 51, so that the first end 11 and the second end 12 of the coil are grounded due to short circuit, and a braking effect is generated on the fan motor 10; on the contrary, when the control unit 30 transmits a brake inhibiting signal 31 to the brake unit 40, the first end 11 and the second end 12 of the coil are not grounded because the brake unit 40 is not operated, i.e. the brake effect is not generated; the brake-suppressing signal 31 can be, for example, a high (high) level signal for releasing the braking effect of the braking unit 40 on the coil of the fan motor 10.
When the control unit 30 can transmit the brake inhibiting signal 31 to the brake unit 40, it represents that the whole system is in a normal state, i.e. the fan motor 10 does not need to brake; in addition, the control unit 30 transmits the suppression braking signal 31 to the braking unit 40 under the following three conditions:
1. the control unit 30 operates normally.
2. The control unit 30 detects the normal operation of the fan motor 10 through the first hall element 61.
3. The control unit 30 detects the rotation of the fan motor 10 by the first hall element 61 and the second hall element 62.
On the contrary, when the control unit 30 does not transmit the suppression brake signal 31 to the brake unit 40, it represents that the fan motor 10 is in an abnormal state, and therefore, the braking effect of the fan motor 10 needs to be provided through the brake unit 40; that is, control unit 30 will not transmit inhibit brake signal 31 to brake unit 40 when one of the following three conditions occurs:
1. the control unit 30 cannot work normally; such as a defective control unit 30.
2. The control unit 30 detects that the fan motor 10 is not normally operated through the first hall element 61; for example, the first driving switch 21, the second driving switch 22, the third driving switch 23 or the fourth driving switch 24 is broken so that the fan motor 10 does not operate.
3. The control unit 30 detects the reverse rotation of the fan motor 10 through the first hall element 61 and the second hall element 62; for example, the fan motor 10 is inoperable and is blown into reverse operation by other fans located within the same system.
The brake circuit of the related art fan has a disadvantage that when the transistor (or MOSFET) of the fan driving circuit is damaged or the control unit is damaged, the brake circuit has no brake function; however, as described above, the present invention can still make the fan motor 10 generate a braking effect when the control unit 30 is damaged or the transistor (or MOSFET) (i.e., the first driving switch 21, the second driving switch 22, the third driving switch 23, or the fourth driving switch 24) is damaged, which skillfully utilizes that the control unit 30 transmits the suppression braking signal 31 to suppress braking (no braking is required) when the system is normal, and the control unit 30 does not transmit (or cannot transmit) the suppression braking signal 31 to activate braking (braking is required) when the system is abnormal.
Please refer to fig. 3, which is a timing chart of the first hall element 61 and the second hall element 62 informing the control unit 30 of the first detection signal 611 and the second detection signal 621 when the fan motor 10 is operating in the forward direction; when the fan motor 10 is running in the forward direction, the first detection signal 611 detected and transmitted by the first hall element 61 leads the second detection signal 621 detected and transmitted by the second hall element 62. Please refer to fig. 4, which is a timing chart of the first hall element 61 and the second hall element 62 informing the control unit 30 of the first detection signal 611 and the second detection signal 621 when the fan motor 10 runs in the reverse direction; when the fan motor 10 runs in the reverse direction, the first detection signal 611 detected and transmitted by the first hall element 61 lags behind the second detection signal 621 detected and transmitted by the second hall element 62.
As shown in fig. 3, the forward rotation sequence is, for example: the first detection signal 611 detected by the first hall element 61 is high (high), and the second detection signal 621 detected by the second hall element 62 is low (low); next, the first detection signal 611 detected by the first hall element 61 is high (high), and the second detection signal 621 detected by the second hall element 62 is high (high); next, the first detection signal 611 detected by the first hall element 61 is low (low), and the second detection signal 621 detected by the second hall element 62 is high (high); next, the first detection signal 611 detected by the first hall element 61 is low (low), and the second detection signal 621 detected by the second hall element 62 is low (low); next, the first detection signal 611 detected by the first hall element 61 is high (high), and the second detection signal 621 detected by the second hall element 62 is low (low); and the rest can be analogized. If the time sequence is not the above time sequence, the inversion is determined. Therefore, the control unit 30 can know whether the fan motor 10 is in the forward operation or the reverse operation by the phase difference between the first detection signal 611 and the second detection signal 621 detected by the first hall element 61 and the second hall element 62, respectively, and activate the brake when the fan motor is in the reverse operation.
Furthermore, when the fan motor 10 is not operated due to the damage of the first driving switch 21, the second driving switch 22, the third driving switch 23 or the fourth driving switch 24, the control unit 30 can know that the fan motor 10 enters the lock mode (lockmode) through the first detection signal 611 detected by the first hall element 61, and then the brake is activated, and the brake is released when the fan motor 10 tries to restart (restart). When the fan motor 10 tries to restart (restart), the brake is released, so that the fan motor 10 may be blown by other fans in the same system to rotate reversely, and the second hall element 62 is used to detect whether the fan motor 10 is rotating reversely; and the brake is activated when the fan motor 10 is detected to be operated reversely.
Please refer to fig. 5, which is a timing chart of the brake suppressing signal 31 and the control unit 30 controlling the first driving switch 21, the second driving switch 22, the third driving switch 23 and the fourth driving switch 24 according to the present invention. As shown in fig. 5, after the control unit 30 transmits the suppression braking signal 31 (for example, a high level (HI) signal in fig. 5) to the braking unit 40 to release the braking action of the braking unit 40 on the fan motor 10, the control unit 30 outputs at least one driving signal 32 to the driving unit 20 to drive the fan motor 10 to start and operate; in addition, if the braking action of the fan motor 10 needs to be started, the control unit 30 stops outputting the driving signal 32 to the driving unit 20, so that the fan motor 10 stops operating and stops rotating slowly due to inertia, and then stops outputting the suppressing braking signal 31 to the braking unit 40, so that the braking unit 40 starts the braking action on the fan motor 10. Therefore, it is possible to prevent the fan motor 10 or the driving unit 20 from being protected by the braking action of the quick-start braking unit 40.
The following is a description of the principle of brake control of the brake unit 40 of the fan apparatus 1 according to the present invention. Please refer to fig. 6, which is a circuit diagram of a fan device according to a first embodiment of the present invention. The elements shown in fig. 6 are the same as those shown in the previous figures, and are not described herein again for brevity. Brake unit 40 includes a first brake switch 401, a second brake switch 402, a first resistor 405, a second resistor 406, a third brake switch 403, a fourth brake switch 404, a third resistor 407, and a fourth resistor 408.
Control unit 30 is electrically connected to a first end of first brake switch 401 and a first end of second brake switch 402 respectively; one end of the first resistor 405 is electrically connected to the second end of the first brake switch 401, the other end is electrically connected to one end of the third resistor 407 and the first end of the third brake switch 403, and the other end of the third resistor 407 is electrically connected to the power unit 50; one end of the second resistor 406 is electrically connected to the first end of the second brake switch 402, the other end is electrically connected to one end of the fourth resistor 408 and the first end of the fourth brake switch 404, and the other end of the fourth resistor 408 is further electrically connected to the power unit 50; a second end of the third brake switch 403 is electrically connected to the first end 11 of the fan motor 10 and the first driving switch 21 and the second driving switch 22 of the driving unit 20; a second end of the fourth brake switch 404 is electrically connected to the second end 12 of the fan motor 10 and the third driving switch 23 and the fourth driving switch 24 of the driving unit 20; the third terminal of first brake switch 401, the third terminal of second brake switch 402, the third terminal of third brake switch 403, and the third terminal of fourth brake switch 404 are all grounded, respectively.
When the control unit 30 transmits a high-level (HI) braking suppression signal 31 to the first brake switch 401 and the second brake switch 402 of the brake unit 40, the first brake switch 401 and the second brake switch 402 are grounded, so that the first resistor 405 and the third resistor 407 cannot conduct the third brake switch 403 (the first brake switch 403 cannot be conducted because the voltage after voltage division is not high enough) through the voltage obtained by dividing the dc voltage 51 output by the power supply unit 50, and the third brake switch 403 is not grounded because of non-conduction; furthermore, the second resistor 406 and the fourth resistor 408 are also unable to conduct the fourth brake switch 404 by the divided voltage of the dc voltage 51 outputted from the power supply unit 50 (the divided voltage is not high enough to conduct), and the fourth brake switch 404 is not conducted and not grounded, so that the brake unit 40 is unable to activate the braking function for the fan motor 10.
When the control unit 30 does not transmit the suppression brake signal 31 to the first brake switch 401 and the second brake switch 402, the first brake switch 401 and the second brake switch 402 are not connected to ground, so that the first resistor 405 is connected to the third brake switch 403 by the divided voltage of the dc voltage 51 output by the power supply unit 50 (the divided voltage is sufficiently high to be connected), and the third brake switch 403 is connected to ground; furthermore, the second resistor 406 and the fourth resistor 408 are also turned on the fourth brake switch 404 by the divided voltage of the dc voltage 51 outputted from the power unit 50 (the divided voltage is high enough to turn on), and the fourth brake switch 404 is turned on and grounded, so that the first end 11 and the second end 12 of the coil of the fan motor 10 are respectively short-circuited to ground to start the braking action on the fan motor 10.
Please refer to fig. 7, which is a circuit diagram of a fan apparatus according to a second embodiment of the present invention. The elements shown in FIG. 7 are the same as those shown in the previous figures, and therefore are not described herein again for brevity. The brake unit 40 includes a first brake switch 401, a second brake switch 402, a first resistor 405, a second resistor 406, a first relay 409 and a second relay 410. Control unit 30 is electrically connected to a first end of first brake switch 401 and a first end of second brake switch 402 respectively; a second end of the first brake switch 401 is electrically connected to a third end of the first relay 409, one end of the first resistor 405 is electrically connected to a second end of the first relay 409, and the other end is electrically connected to the power unit 50; a second end of the second brake switch 402 is electrically connected to a third end of the second relay 410, one end of the second resistor 406 is electrically connected to a second end of the second relay 410, and the other end is electrically connected to the power unit 50; a first end of the first relay 409 is electrically connected to the first end 11 of the fan motor 10 and the first and second driving switches 21 and 22 of the driving unit 20; a first end of the second relay 410 is electrically connected to the second end 12 of the fan motor 10 and the third and fourth driving switches 23 and 24 of the driving unit 20; the third terminal of first brake switch 401, the third terminal of second brake switch 402, the first terminal of first relay 409 and the first terminal of second relay 410 are all grounded, respectively.
When the control unit 30 transmits a high level (HI) suppression brake signal 31 to the first brake switch 401 and the second brake switch 402 of the brake unit 40, the first brake switch 401 and the second brake switch 402 are grounded, so that the first relay 409 and the second relay 409 are not grounded and the braking action of the fan motor 10 is not activated.
When the control unit 30 does not transmit the suppression brake signal 31 to the first brake switch 401 and the second brake switch 402, the first brake switch 401 and the second brake switch 402 are not conducted and are not grounded, so that the first relay 409 and the second relay 409 are grounded, and the first end 11 and the second end 12 of the coil of the fan motor 10 are respectively short-circuited to ground to start the braking action on the fan motor 10.
The invention has the technical effect that when the fan motor is damaged, the brake effect on the fan motor can be continuously generated.
However, the above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited by the above-mentioned embodiments, and all equivalent changes and modifications made by the claims of the present invention should be covered by the protection scope of the present invention. The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. In summary, it is understood that the present invention has industrial applicability, novelty and advancement, and the structure of the present invention is not disclosed in the similar products and applications, which completely conform to the requirements of the patent application and are filed by the patent application.
Claims (14)
1. A fan device with brake includes:
a fan motor having a first end and a second end;
a driving unit electrically connected to the first end and the second end of the fan motor for driving the fan motor according to a driving signal;
a brake unit electrically connected to the driving unit and the first end and the second end of the fan motor, respectively; and
a control unit, electrically connected to the driving unit and the braking unit, respectively, for outputting the driving signal and a braking suppressing signal;
the detection unit is electrically connected to the control unit to detect the rotation state of the fan motor and generate a first detection signal to be transmitted to the control unit, and when the control unit knows that the fan motor does not rotate through the first detection signal, the control unit does not transmit the brake inhibiting signal to the brake unit;
when the brake unit receives the brake inhibiting signal, the first end and the second end are not grounded, and the brake is not started; otherwise, when the brake unit does not receive the brake inhibiting signal, the first end and the second end are grounded to start braking.
2. The fan apparatus with brake of claim 1, further comprising a power unit electrically connected to the brake unit, the power unit providing a dc voltage to the brake unit, and the dc voltage grounding the first terminal and the second terminal when the brake unit does not receive the brake-suppressing signal, thereby activating braking.
3. The fan apparatus with brake of claim 1, wherein the control unit does not transmit the brake suppression signal to the brake unit when the control unit is damaged.
4. The fan apparatus with brake of claim 1, wherein the detecting unit comprises:
the first Hall element is electrically connected to the control unit so as to detect the rotation state of the fan motor and generate a first detection signal to be transmitted to the control unit; and
and the second Hall element is electrically connected to the control unit so as to detect the rotation state of the fan motor and generate a second detection signal to be transmitted to the control unit.
5. The fan apparatus with brake as claimed in claim 4, wherein the first hall element and the second hall element are respectively disposed at different positions relative to the fan motor, so that the first detection signal and the second detection signal generate a phase difference, and the control unit determines whether the fan motor is operating in forward direction or reverse direction according to the phase difference; when the fan motor runs reversely, the control unit does not transmit the suppression brake signal to the brake unit.
6. The fan apparatus with brake of claim 5, wherein the phase difference is 30°To 90°In the meantime.
7. The fan apparatus with brake of claim 5, wherein the first detection signal leads the second detection signal when the fan motor is running in a forward direction; when the fan motor runs reversely, the first detection signal lags behind the second detection signal.
8. The fan apparatus with brake of claim 1, wherein the control unit transmits the brake suppressing signal to the brake unit to release the braking effect of the brake unit on the fan motor, and then the control unit outputs the driving signal to the driving unit to drive the fan motor to start and operate.
9. The fan apparatus with brake of claim 7, wherein when the braking action of the fan motor is activated, the control unit stops outputting the driving signal to the driving unit to stop the fan motor, and then stops outputting the braking inhibiting signal to the braking unit to brake the fan motor.
10. The fan apparatus with brake as claimed in claim 1, wherein the driving unit includes a first driving switch, a second driving switch, a third driving switch and a fourth driving switch, and the first driving switch, the second driving switch, the third driving switch and the fourth driving switch are electrically connected to the control unit respectively.
11. The fan apparatus with brake of claim 10, wherein the brake unit comprises: a first brake switch, a second brake switch, a first resistor, a second resistor, a third brake switch, a fourth brake switch, a third resistor and a fourth resistor; the control unit is electrically connected with the first end of the first brake switch and the first end of the second brake switch respectively; one end of the third resistor is electrically connected to the second end of the first brake switch, the other end of the third resistor is electrically connected to one end of the first resistor and the first end of the third brake switch, and the other end of the first resistor is electrically connected to the power supply unit; one end of the fourth resistor is electrically connected to the first end of the second brake switch, the other end of the fourth resistor is electrically connected to one end of the second resistor and the first end of the fourth brake switch, and the other end of the second resistor is electrically connected to the power supply unit.
12. The fan apparatus with brake of claim 11, wherein the second end of the third brake switch is electrically connected to the first end of the fan motor and the first and second driving switches of the driving unit; a second end of the fourth brake switch is electrically connected to the second end of the fan motor and the third and fourth driving switches of the driving unit; and the third end of the first brake switch, the third end of the second brake switch, the third end of the third brake switch and the third end of the fourth brake switch are all grounded respectively.
13. The fan apparatus with brake of claim 10, wherein the brake unit comprises: the control unit is electrically connected with a first end of the first brake switch and a first end of the second brake switch respectively; the second end of the first brake switch is electrically connected with the third end of the first relay, one end of the first resistor is electrically connected with the second end of the first relay, and the other end of the first resistor is electrically connected with the power supply unit; the second end of the second brake switch is electrically connected to the third end of the second relay, one end of the second resistor is electrically connected to the second end of the second relay, and the other end of the second resistor is electrically connected to the power supply unit.
14. The fan apparatus with brake of claim 13, wherein a first end of the first relay is electrically connected to the first end of the fan motor and the first driving switch and the second driving switch of the driving unit; the first end of the second relay is electrically connected with the second end of the fan motor and the third driving switch and the fourth driving switch of the driving unit; and the third end of the first brake switch, the third end of the second brake switch, the first end of the first relay and the first end of the second relay are respectively grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610136722.9A CN107182184B (en) | 2016-03-11 | 2016-03-11 | Fan device with brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610136722.9A CN107182184B (en) | 2016-03-11 | 2016-03-11 | Fan device with brake |
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| CN107182184A CN107182184A (en) | 2017-09-19 |
| CN107182184B true CN107182184B (en) | 2020-06-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TW475104B (en) * | 1998-12-28 | 2002-02-01 | Foxconn Prec Components Co Ltd | Computer heat dissipating system |
| CN1988360B (en) * | 2005-12-19 | 2010-04-28 | 台达电子工业股份有限公司 | Fan system and its braking method |
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