CN201639524U - Positive and negative rotation control circuit of fan - Google Patents
Positive and negative rotation control circuit of fan Download PDFInfo
- Publication number
- CN201639524U CN201639524U CN201020102473XU CN201020102473U CN201639524U CN 201639524 U CN201639524 U CN 201639524U CN 201020102473X U CN201020102473X U CN 201020102473XU CN 201020102473 U CN201020102473 U CN 201020102473U CN 201639524 U CN201639524 U CN 201639524U
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- control unit
- positive
- reverse rotation
- resistance
- fan
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Abstract
A positive and negative rotation control circuit of a fan comprises a driving control unit and a steering switching control unit. The driving control unit is used for being electrically connected with a fan motor, the steering switching control unit consists of a plurality of analog type circuit elements, the steering switching control unit is electrically connected with the driving control unit, and the steering switching control unit can generate a positive and negative rotation switching signal group to control the fan motor to rotate at certain time along a preset rotary direction when started and then rotate oppositely.
Description
Technical field
The utility model is the rotation control circuit about a kind of fan, especially a kind of control circuit of may command one fan motor rotating.
Background technology
For the heat that electronic product is produced when operating disperses effectively, prior art is operated by the heat of driving of a radiator fan usually, to reach the purpose of this electronic product quick heat radiating.Driving in the heat operation of this radiator fan, this radiator fan forward rotation enters this electronic product inside with the guiding outer gas stream, so that being carried out heat, disperses thermal source, yet owing to this outer gas stream is imported in this electronic product in a large number, so that easily at the inner laying dust of this electronic product; Therefore, at the beginning of this electronic product starts running, can control this radiator fan backward rotation a period of time (for example 5 seconds) usually, so that this radiator fan can be guided out the outside with the inner laying dust of this electronic product, to carry out the dedusting operation of this electronic product inside; Thereafter, control this radiator fan forward rotation again, with the operation of dispelling the heat.
For reaching the control purpose of dispelling the heat after existing this radiator fan elder generation dedusting, as shown in Figure 1, the positive and reverse rotation control circuit that it discloses existing fan comprises a driver element 91 and a microcontroller 92.This driver element 91 and this microcontroller 92 connect a voltage source V CC respectively, so that this voltage source V CC can supply the required power supply of this driver element 91 and this microcontroller 92; This driver element 91 is electrically connected this microcontroller 92, and this driver element 91 is electrically connected a fan motor 8 in addition.
When startup should have fan now, this microcontroller 92 was sent a turn signal, and imports in this driver element 91, rotated along a preset rotating direction so that this driver element 91 can be controlled this fan motor 8 according to this, to carry out the dedusting operation.
After this existing fan dedusting a period of time, 92 of this microcontrollers are sent one and are the backward rotation signal of antilogical mutually with this turn signal, so that this fan motor 8 of these driver element 91 may command is along rotating in contrast to this preset rotating direction, with the operation of dispelling the heat.
Yet, generally speaking, the positive and reverse rotation control circuit of above-mentioned existing fan will have following shortcoming: this existing fan need utilize this microcontroller 92 to produce this turn signal and backward rotation signal, to control its rotating, because this microcontroller 92 is the element of a high unit price, therefore this fan uses this this fan motor 8 of microcontroller 92 controls to rotate, and certainly will cause circuit cost to increase.For these reasons, be necessary further to improve the positive and reverse rotation control circuit of above-mentioned existing fan.
The utility model content
The utility model purpose provides a kind of positive and reverse rotation control circuit of fan, only is made of several matching test circuit elements, avoids using a microprocessor controls one fan motor rotating, to reduce circuit cost is set.
Positive and reverse rotation control circuit according to the utility model fan comprises: a driving control unit and turns to switch control unit, and this driving control unit is that power supply connects a fan motor; This turns to switch control unit only to be made of several matching test circuit elements, this turns to switch control unit to be electrically connected this driving control unit, and this turns to switch control unit to produce a rotating switching signal group, control this fan motor and rotate a period of time along a preset rotating direction earlier when starting, back this fan motor of control rotates along the direction opposite with this preset rotating direction.
The beneficial effects of the utility model are: the utility model this turn to switch control unit only by the setting of several analogy elements, to export this rotating switching signal group, and then control this fan motor and when starting, rotate a period of time along a preset rotating direction earlier, back this fan motor of control rotates along the direction opposite with this preset rotating direction, need utilize the running of this this fan motor of microprocessor controls, the utility model to have compared to the positive and reverse rotation control circuit of existing fan and reduce the effect that circuit is provided with cost.
Description of drawings
Fig. 1: the positive and reverse rotation control circuit schematic diagram of existing fan.
Fig. 2: the positive and reverse rotation control circuit schematic diagram of the fan of the utility model first embodiment.
Fig. 3 a: the charging voltage waveform schematic diagram that turns to switch control unit to produce of the utility model first embodiment.
Fig. 3 b: the charging voltage waveform schematic diagram of driving control unit corresponding conversion Fig. 3 a of the utility model first embodiment.
Fig. 4: the positive and reverse rotation control circuit schematic diagram of the fan of the utility model second embodiment.
Fig. 5: the positive and reverse rotation control circuit schematic diagram of the fan of the utility model the 3rd embodiment.
Fig. 6: the positive and reverse rotation control circuit schematic diagram of the fan of the utility model the 4th embodiment.
Fig. 7: the positive and reverse rotation control circuit schematic diagram of the fan of the utility model the 5th embodiment.
Fig. 8: the positive and reverse rotation control circuit schematic diagram of the fan of the utility model the 6th embodiment.
Fig. 9: the positive and reverse rotation control circuit schematic diagram of the fan of the utility model the 7th embodiment.
Figure 10: the positive and reverse rotation control circuit schematic diagram of the fan of the utility model the 8th embodiment.
[main element symbol description]
1 driving control unit 2 turns to switch control unit 21 resistance
22 electric capacity 2 ' turn to switch control unit 21 ' resistance
22 ' electric capacity 3 turns to switch control unit 31 resistance
32 electric capacity, 33 discharge loop diodes 3 ' turn to switch control unit
31 ' resistance, 32 ' electric capacity, 33 ' discharge loop diode
4 turn to switch control unit 41 resistance 42 electric capacity
43 discharge loop diodes, 44 transistor switches 4 ' turn to switch control unit
41 ' resistance, 42 ' electric capacity, 43 ' discharge loop diode
44 ' transistor switch 5 turns to switch control unit 51 resistance
52 electric capacity, 53 discharge loop diodes, 54 first divider resistances
55 second divider resistances, 56 comparators, 561 inputs
562 negative input ends 5 ' turn to switch control unit 51 ' resistance
52 ' electric capacity, 53 ' discharge loop diode, 54 ' first divider resistance
55 ' second divider resistance, 56 ' comparator, 561 ' positive input terminal
562 ' negative input end, 6 fan motors, 8 fan motors
91 driver elements, 92 microcontrollers
Embodiment
For above-mentioned and other purpose of the present utility model, feature and advantage can be become apparent, preferred embodiment of the present utility model cited below particularly, and cooperate figure attached, be described in detail below:
Please refer to shown in Figure 2, it discloses the positive and reverse rotation control circuit of the fan of the utility model first embodiment, it comprises a driving control unit 1 and and turns to switch control unit 2, and this driving control unit 1 and this turn to switch control unit 2 to be connected to a power supply VCC jointly.This driving control unit 1 is for connecting a fan motor 6; This turns to switch control unit 2 only to be made of several matching test circuit elements, a charge-discharge circuit for example, and this turns to switch control unit 2 to be electrically connected these driving control unit 1; In addition, the utility model has a storage capacitor C in addition, in order to store electrical energy, so that this power supply VCC when interrupting, can provide the power supply of this fan.This turns to switch control unit 2 can produce a rotating switching signal group, receive for this driving control unit 1, and then control this fan motor 6 and when starting, rotate a period of time along a preset rotating direction earlier, control this fan motor 6 in back rotates along the direction opposite with this preset rotating direction.
Referring again to shown in Figure 2, further say it, this rotating switching signal group comprises a forward rotation control signal and a backward rotation control signal, this driving control unit 1 can receive this forward rotation control signal and this backward rotation control signal, and conversion produces a low-level logic signal and a high level logic signal respectively, and after this forward rotation control signal is kept one scheduled time of output, switch this backward rotation control signal of output, rotate a period of time along this preset rotating direction earlier to reach this fan motor 6, after again along the requirement of the control of rotating in contrast to this preset rotating direction.
Referring again to shown in Figure 2, the switch control unit 2 that turns to of the utility model first embodiment comprises resistance 21 and an electric capacity 22.This resistance 21 and this electric capacity 22 form this charge-discharge circuit, the place of being connected in series of this resistance 21 and this electric capacity 22 is a signal output part, this signal output part is coupled to this driving control unit 1, and promptly this electric capacity 22 is connected in parallel with the signal input part and the earth terminal of this driving control unit 1.
Please refer to shown in Fig. 2,3a and the 3b, when starting fan of the present utility model, this power supply VCC is to these electric capacity 22 chargings, its charging voltage curve is shown in Fig. 3 a, wherein the charging voltage of this electric capacity 22 of the utility model first embodiment promptly can be used as this rotating switching signal group, receives for this driving control unit 1.
Further say it, please be simultaneously with reference to shown in Fig. 3 b, after this driving control unit 1 receives this charging voltage, will be with a low threshold voltage VL (as 1V) and a high threshold voltage VH (as 4V) as basis for estimation, so that this charging voltage is converted to a low-level logic signal or a high level logic signal.For example, when the charging voltage signal that is received did not reach the low threshold voltage VL of this driving control unit 1, this driving control unit 1 was converted to the low-level logic signal with charging voltage at this moment; Relative, when the charging voltage signal level that is received was higher than this high threshold voltage VH, then this driving control unit 1 was converted to the high level logic signal with charging voltage.
In other words, charge in the process of this low threshold voltage VL by 0V at this electric capacity 22, this driving control unit 1 will be looked this section charging interval T1 and will be this forward rotation control signal, and this moment, this driving control unit 1 this fan motor 6 of control rotated a period of time (this section rotation time is consistent with this charging interval T1) along this preset rotating direction in advance; Relative, if when the charging voltage of this electric capacity 22 surpasses the high threshold voltage VH of this driving control unit 1, then be judged as this backward rotation control signal, and by this this fan motor 6 of driving control unit 1 control along rotating in contrast to this preset rotating direction.Wherein, by the resistance of this resistance 21 of suitable design and the appearance value of this electric capacity 22, can adjust the length of this section charging interval T1.
In addition, the driving control unit 1 of the utility model first embodiment is higher than this low threshold voltage VL in this charging voltage of reception, but when not reaching the intermediate potential between this high threshold voltage VH, because this driving control unit 1 can't be judged as high level logic signal or low-level logic signal, therefore, in the charging interval of this section intermediate potential T2, this fan motor 6 will stop operating, when this charging voltage was higher than this high threshold voltage VH, this fan motor 6 was replied rotary state.
Please refer to shown in Figure 4, it discloses the positive and reverse rotation control circuit of the fan of the utility model second embodiment, compared to first embodiment, one of the utility model second embodiment turns to switch control unit 3 to include a resistance 31, an electric capacity 32 and a discharge loop diode 33.This resistance 31 and this electric capacity 32 form this charge-discharge circuit, and this electric capacity 32 becomes to be connected in parallel with the signal input part and the earth terminal of this driving control unit 1; 31 one-tenth reverse parallel connections of this discharge loop diode 33 and this resistance are connected, and promptly an anode of this discharge loop diode 33 is signal output parts that connect this charge-discharge circuit.
Whereby, when this fan shut down, the charging voltage of this electric capacity 32 can be by a discharge path repid discharge of this resistance 31 and this discharge loop diode 33 formations.In other words, if only utilize this electric capacity 32 to discharge, need long discharge time, so the utility model second embodiment is by being provided with this discharge path shortening discharge time, and then improves this fan starts running once more in the short time smoothness.
Please refer to shown in Figure 5, it discloses the positive and reverse rotation control circuit of the fan of the utility model the 3rd embodiment, compared to second embodiment, one of the utility model the 3rd embodiment turns to switch control unit 4 to include a resistance 41, an electric capacity 42, a discharge loop diode 43 and a transistor switch 44.The circuit form of this resistance 41, this electric capacity 42 and this discharge loop diode 43 and effect are identical with this resistance 31, this electric capacity 32 and this discharge loop diode 33 of second embodiment, seldom give unnecessary details in this.
Referring again to shown in Figure 5, the input of this transistor switch 44 of the utility model the 3rd embodiment is electrically connected the signal output part that this resistance 41 and this electric capacity 42 are connected to form, so that the conducting of this transistor switch 44 of charging voltage may command of this electric capacity 42 or close; Moreover the signal input part and the earth terminal of the collection utmost point of this transistor switch 44, emitter-base bandgap grading and this driving control unit 1 are connected in parallel, and promptly an output of this transistor switch 44 (collector terminal or emitter-base bandgap grading end) is electrically connected this driving control unit 1.Wherein this transistor switch 44 can be selected from a N transistor npn npn, as a NPN transistor or a nmos pass transistor.
Further say it, when this charging voltage did not reach a conducting voltage of this transistor switch 44, this transistor switch 44 formed open circuit, and this driving control unit 1 receives the voltage of this power supply VCC, and is judged as the high level logic signal; Otherwise, when this charging voltage surpasses this conducting voltage of this transistor switch 44, this transistor switch 44 conductings and ground connection, this driving control unit 1 receives the low-level logic signal at this moment.
From the above, compared to first embodiment and second embodiment, because the transistor switch 44 of the utility model the 3rd embodiment only operates in turned on or off, therefore this turns to switch control unit 4 can carry out the handover operation of logic signal levels rapidly, with the problem of avoiding causing this fan to shut down, so can further improve this fan running smoothness because of intermediate potential.
Moreover the switch control unit 4 that turns to of the utility model the 3rd embodiment also can operate under omission is provided with the situation of this discharge loop diode 43, and then reduces circuit and cost is set and simplifies circuit and connect complexity.
Please refer to shown in Figure 6, it discloses the positive and reverse rotation control circuit of the fan of the utility model the 4th embodiment, compared to the 3rd embodiment, one of the utility model the 4th embodiment turns to switch control unit 5 to include a resistance 51, an electric capacity 52, a discharge loop diode 53, one first divider resistance 54, one second divider resistance 55 and a comparator 56.The circuit form of this resistance 51, this electric capacity 52 and this discharge loop diode 53 and effect are identical with this resistance 31, this electric capacity 32 and this discharge loop diode 33 of second embodiment, seldom give unnecessary details in this.
Referring again to shown in Figure 6, this first divider resistance 54 of the utility model the 4th embodiment and this second divider resistance 55 are connected mutually to form a bleeder circuit, it has a dividing potential drop output, and this bleeder circuit is to be connected between this power supply VCC and the earth terminal, so that the dividing potential drop output at this bleeder circuit is set up a comparative voltage, this comparative voltage is the cross-pressure of this second divider resistance 55.
This comparator 56 has a positive input terminal 561 and a negative input end 562.The signal output part that this resistance 51 and this electric capacity 52 are connected to form is electrically connected to the positive input terminal 561 of this comparator 56; The dividing potential drop output of this bleeder circuit then is electrically connected to the negative input end 562 of this comparator 56, so, the comparative voltage of the charging voltage of this electric capacity 52 and this second divider resistance 55 can be imported these comparator 56 inside and compare, so that this comparator 56 is judged output high level logic signal or output low level logical signal, that is, when this charging voltage does not reach this comparative voltage (promptly less than this comparative voltage), these comparator 56 output low level logical signals; Otherwise, when this charging voltage surpasses this comparative voltage (promptly greater than this comparative voltage), these comparator 56 output high level logic signals.This comparator 56 has an output in addition, and this output connects the signal input part of this driving control unit 1.
The comparative voltage of the utility model the 4th embodiment can be by the respective resistances value of adjusting this first divider resistance 54 and this second divider resistance 55, to set the magnitude of voltage of this comparative voltage.For example: this power supply VCC is 5V, if the ratio of the resistance value of this first divider resistance 54 and the resistance value of this second divider resistance 55 is 1: 4 o'clock, then this comparative voltage then is 4V.
Moreover, because the output of this comparator 56 equally only has the switching state of high level logic and low-level logic, therefore, compared to first embodiment and second embodiment turn to switch control unit 2, the utility model the 4th embodiment also can avoid the problem that causes this fan to shut down because of intermediate potential.
In addition, because the utility model the 4th embodiment can improve the magnitude of voltage of this comparative voltage by the design of this two divider resistance 54 and 55, and this comparative voltage can design the low threshold voltage VL greater than this driving control unit 1, so turn to switch control unit 2 compared to first embodiment and second embodiment, under the condition of keeping identical charging interval T1, this electric capacity 52 of the utility model the 4th embodiment can be selected less specified electric capacity for use.
Again, the switch control unit 5 that turns to of the utility model the 4th embodiment also can operate under omission is provided with the situation of this discharge loop diode 53, and then reduces circuit and cost is set and simplifies circuit and connect complexity.
The positive and reverse rotation control circuit of the fan of above-mentioned first embodiment to the of the utility model four embodiment is as this rotating switching signal group, to control this fan motor 6 rotations with this charging voltage.Opposite, this positive and reverse rotation control circuit equally can also a discharge voltage as this rotating switching signal group, to carry out the control of antilogical.
Please refer to shown in Figure 7, it discloses the positive and reverse rotation control circuit of the fan of the utility model the 5th embodiment, compared to first embodiment, the switch control unit 2 ' that turns to of the utility model the 5th embodiment is to form this charge-discharge circuit by resistance 21 ' and an electric capacity 22 ', and this resistance 21 ' becomes to be connected in parallel with the signal input part and the earth terminal of this driving control unit 1.This turns to the operation of switch control unit 2 ' by the discharge voltage of this resistance 21 ', makes 1 pair of the driving control unit of this second embodiment switch to a low-level logic signal by a high level logic signal by discharge voltage.
Please refer to shown in Figure 8, it discloses the positive and reverse rotation control circuit of the fan of the utility model the 6th embodiment, compared to second embodiment, the switch control unit 3 ' that turns to of the utility model the 6th embodiment comprises a resistance 31 ', an electric capacity 32 ' and a discharge loop diode 33 '.This discharge loop diode 33 ' this resistance 31 ' that is connected in parallel, and a negative electrode of this discharge loop diode 33 ' is a signal output part that connects this charge-discharge circuit.By this, this driving control unit 1 can be to switching to a low-level logic signal by a high level logic signal by discharge voltage.
Please refer to shown in Figure 9, it discloses the positive and reverse rotation control circuit of the fan of the utility model the 7th embodiment, compared to the 3rd embodiment, the switch control unit 4 ' that turns to of the utility model the 7th embodiment comprises a resistance 41 ', an electric capacity 42 ', a discharge loop diode 43 ' and a transistor switch 44 '.This transistor switch 44 ' is electrically connected the signal output part that this resistance 41 ' and this electric capacity 42 ' is connected to form, so that the conducting of this transistor switch 44 ' of discharge voltage may command of this resistance 41 ' or close.Wherein this transistor switch 44 ' can be selected from a P transistor npn npn, as a PNP transistor or a PMOS transistor.
Please refer to shown in Figure 10, it discloses the positive and reverse rotation control circuit of the fan of the utility model the 8th embodiment, compared to the 4th embodiment, the switch control unit 5 ' that turns to of the utility model the 8th embodiment comprises a resistance 51 ', an electric capacity 52 ', a discharge loop diode 53 ', one first divider resistance 54 ', one second divider resistance 55 ' and a comparator 56 '.By this resistance 51 ' and this electric capacity 52 ' formed signal output part is a negative input end 562 ' that is connected to this comparator 56 '; A dividing potential drop output that is formed by this two divider resistance 54 ' and 55 ' then is a positive input terminal 561 ' that is connected to this comparator 56 '.Whereby, this driving control unit 1 can be carried out the rotation control of this fan motor 6 by a corresponding discharge voltage.This comparator 56 ' has an output in addition, and this output connects the signal input part of this driving control unit 1.
In sum, the utility model this turn to switch control unit 2,2 ', 3,3 ', 4,4 ', 5 and 5 ' only by the setting of several analogy elements, to export this rotating switching signal group, and then control this fan motor 6 and when starting, rotate a period of time along a preset rotating direction earlier, control this fan motor 6 in back is along rotating in contrast to this preset rotating direction, positive and reverse rotation control circuit compared to existing fan need utilize this microcontroller 92 to control the running of these fan motors 8, and the utility model will have the effect that the reduction circuit is provided with cost.
Claims (13)
1. the positive and reverse rotation control circuit of a fan is characterized in that, it comprises:
A driving control unit is electrically connected a fan motor; And
One turns to switch control unit, constitute by at least one charge-discharge circuit, this turns to switch control unit to be electrically connected this driving control unit, and this charge-discharge circuit produces a rotating switching signal group, control this fan motor and rotate a period of time along a preset rotating direction earlier when starting, back this fan motor of control rotates along the direction opposite with this preset rotating direction.
2. the positive and reverse rotation control circuit of fan according to claim 1, it is characterized in that: this turns to switch control unit to comprise a resistance and an electric capacity, this resistance and this capacitances in series form this charge-discharge circuit, and the place of being connected in series of this resistance and this electric capacity is a signal output part, and this signal output part is coupled to this driving control unit.
3. the positive and reverse rotation control circuit of fan according to claim 2 is characterized in that: the signal input part and the earth terminal of this electric capacity and this driving control unit are connected in parallel.
4. the positive and reverse rotation control circuit of fan according to claim 2, it is characterized in that: this turns to switch control unit to comprise a discharge loop diode in addition, this discharge loop diode reverse this resistance that is connected in parallel.
5. according to the positive and reverse rotation control circuit of claim 2 or 4 described fans, it is characterized in that: this turns to switch control unit to comprise a transistor switch in addition, and this transistor switch is electrically connected this signal output part.
6. the positive and reverse rotation control circuit of fan according to claim 5, it is characterized in that: an output of this transistor switch connects a signal input part of this driving control unit.
7. the positive and reverse rotation control circuit of fan according to claim 5, it is characterized in that: this transistor switch is a N transistor npn npn.
8. according to the positive and reverse rotation control circuit of claim 2 or 4 described fans, it is characterized in that: this turns to switch control unit to comprise a comparator in addition, this comparator has a positive input terminal, a negative input end and an output, the signal output part that this resistance and this electric capacity was connected to form is electrically connected to this positive input terminal, and this turns to switch control unit to comprise one first divider resistance and one second divider resistance in addition, this first divider resistance and this second divider resistance are connected mutually to form a bleeder circuit, it has a dividing potential drop output, the dividing potential drop output of this bleeder circuit is electrically connected to this negative input end, and the output of this comparator connects a signal input part of this driving control unit.
9. the positive and reverse rotation control circuit of fan according to claim 8, it is characterized in that: this bleeder circuit is to be connected between this power supply and the earth terminal.
10. the positive and reverse rotation control circuit of fan according to claim 2 is characterized in that: the signal input part and the earth terminal of this resistance and this driving control unit are connected in parallel.
11. the positive and reverse rotation control circuit of fan according to claim 5 is characterized in that: this transistor switch is a P transistor npn npn.
12. positive and reverse rotation control circuit according to claim 2 or 4 described fans, it is characterized in that: this turns to switch control unit to comprise a comparator in addition, this comparator has a negative input end and a positive input terminal and an output, the signal output part that this resistance and this electric capacity was connected to form is electrically connected to this negative input end, and this turns to switch control unit to comprise one first divider resistance and one second divider resistance in addition, this first divider resistance and this second divider resistance are connected mutually to form a bleeder circuit, this bleeder circuit has a dividing potential drop output, the dividing potential drop output of this bleeder circuit is electrically connected to this positive input terminal, and the output of this comparator connects a signal input part of this driving control unit.
13. the positive and reverse rotation control circuit of fan according to claim 12 is characterized in that: this bleeder circuit is connected between this power supply and the earth terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020102473XU CN201639524U (en) | 2010-01-27 | 2010-01-27 | Positive and negative rotation control circuit of fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020102473XU CN201639524U (en) | 2010-01-27 | 2010-01-27 | Positive and negative rotation control circuit of fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201639524U true CN201639524U (en) | 2010-11-17 |
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ID=43084030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020102473XU Expired - Lifetime CN201639524U (en) | 2010-01-27 | 2010-01-27 | Positive and negative rotation control circuit of fan |
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| Country | Link |
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| CN (1) | CN201639524U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136816B (en) * | 2010-01-27 | 2013-05-29 | 建准电机工业股份有限公司 | Positive and negative rotation control circuit for fan |
| CN112187986A (en) * | 2020-09-29 | 2021-01-05 | 努比亚技术有限公司 | Heat dissipation control circuit, heat dissipation back splint and mobile terminal |
-
2010
- 2010-01-27 CN CN201020102473XU patent/CN201639524U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136816B (en) * | 2010-01-27 | 2013-05-29 | 建准电机工业股份有限公司 | Positive and negative rotation control circuit for fan |
| CN112187986A (en) * | 2020-09-29 | 2021-01-05 | 努比亚技术有限公司 | Heat dissipation control circuit, heat dissipation back splint and mobile terminal |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20101117 Effective date of abandoning: 20100127 |
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| RGAV | Abandon patent right to avoid regrant |