CN202468483U - Secondary voltage circuit for lowering fan noise - Google Patents
Secondary voltage circuit for lowering fan noise Download PDFInfo
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- CN202468483U CN202468483U CN2011205671220U CN201120567122U CN202468483U CN 202468483 U CN202468483 U CN 202468483U CN 2011205671220 U CN2011205671220 U CN 2011205671220U CN 201120567122 U CN201120567122 U CN 201120567122U CN 202468483 U CN202468483 U CN 202468483U
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- transistor
- secondary voltage
- voltage circuit
- fan
- resistance
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Abstract
The utility model discloses a secondary voltage circuit for lowering fan noise. The secondary voltage circuit comprises a power supply, a voltage division component, a switch component and a control unit. The voltage division component is in parallel connection with the switch component. The control unit which controls on and off of the switch component is connected between the power supply and the switch component. An output end of the switch component is connected to a fan. By the secondary voltage circuit, the on and off of the switch component is controlled through the control unit so as to change voltage applied by the power supply to the fan, power supply voltage applied to the fan after the fan is started is reduced, and the fan noise is lowered.
Description
Technical field
The utility model relates to circuit control field, relates more specifically to a kind of secondary voltage circuit that is used to reduce the secondary voltage circuit of fan noise.
Background technique
Fan is usually used in the electronic equipment now so that good thermolysis to be provided, yet in actual use, fan noise is bigger, and it becomes the performance deficiency that the electronic product that fan is set is arranged usually.And at present, fan noise processing mode commonly used is, serial connection one tens Europe resistance on the fan line reduce fan voltage, thereby reduces rotation speed of the fan and reach the reduction fan noise.But there is the starting fan problem in this mode, some fan promptly can occur because of starting torque is not enough, can not rotate.
In order to address the aforementioned drawbacks, be necessary to provide a kind of fan that can make normally to start, the secondary voltage mode that fan noise is reduced reduces fan noise.
The model utility content
The purpose of the utility model provides a kind of fan that can make and normally starts, and secondary voltage mode that fan noise is reduced reduces fan noise.
To achieve these goals; The utility model provides a kind of secondary voltage circuit that is used to reduce fan noise; The secondary voltage circuit comprises power supply, sectional pressure element, switching element and control unit; Said sectional pressure element and said switching element are in parallel, and said control unit is connected in conducting or the disconnection to control said switching element between said power supply and the said switching element, and the output terminal of said switching element is connected to said fan.
Its further technological scheme is: said switching element is a first transistor, and said power supply is connected to the emitter of said the first transistor, and said fan is connected to the collector electrode of said the first transistor.
Its further technological scheme is: said switching element is a metal oxide semiconductor field effect tube; Said power supply is connected to the source electrode of said metal oxide semiconductor field effect tube, and said fan is connected to the drain electrode of said metal oxide semiconductor field effect tube.
Its further technological scheme is: said sectional pressure element comprises first divider resistance, and said first divider resistance is parallel between the collector and emitter of said the first transistor or is parallel between the source electrode and drain electrode of said metal oxide semiconductor field effect tube.
Its further technological scheme is: said sectional pressure element also comprises second divider resistance, and said first divider resistance and second divider resistance are parallel with one another.
Its further technological scheme is: said control unit comprises RC integration circuit and Darlington transistor; Said RC integration circuit is made up of the charging capacitor and the charging resistor of mutual series connection; Said Darlington transistor is made up of transistor seconds and the 3rd transistor; Said charging resistor links to each other with the base stage of said the first transistor; The collector electrode of said transistor seconds is connected to the emitter of said the first transistor or the source electrode of metal oxide semiconductor field effect tube through a resistance, and the said the 3rd transistorized collector electrode is connected to the base stage of said the first transistor or the grid of metal oxide semiconductor field effect tube through a resistance.
Its further technological scheme is: be connected with one second earth resistance between said charging resistor and the said transistor seconds.
Its further technological scheme is: said control unit also comprises protective circuit, and said protective circuit comprises the mutual diode in series and first earth resistance, and said diode is connected between said charging capacitor and the charging resistor.
Its further technological scheme is: said control unit comprises microcontroller and the 4th transistor; The general input of said microcontroller links to each other with the said the 4th transistorized base stage through a resistance, and the said the 4th transistorized collector electrode is connected to the base stage of said the first transistor or the grid of metal oxide semiconductor field effect tube through a resistance.
Compared with prior art, the secondary voltage circuit that is used for reducing fan noise that the utility model provides, the secondary voltage circuit comes the break-make of control switch element and to fan secondary voltage is provided through control module; When switching element is in open mode; Realize that total head control fan normally starts, and when switching element is in closed condition, under the dividing potential drop effect of sectional pressure element; The voltage that imposes on fan reduces, thereby reaches the purpose that reduces fan noise.
Through following description and combine accompanying drawing, it is more clear that the utility model will become, and these accompanying drawings are used to explain the embodiment of the utility model.
Description of drawings
Fig. 1 is used to reduce the schematic block circuit diagram of the secondary voltage circuit of fan noise for the utility model.
Fig. 2 is the circuit diagram that is used to reduce secondary voltage circuit first embodiment of fan noise shown in Figure 1.
Fig. 3 is the circuit diagram that is used to reduce secondary voltage circuit second embodiment of fan noise shown in Figure 1.
Fig. 4 is the circuit diagram that is used to reduce secondary voltage circuit the 3rd embodiment of fan noise shown in Figure 1.
Each description of reference numerals is following among the figure:
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technological scheme among the embodiment is carried out clear, intactly description, similar assembly label is represented similar assembly in the accompanying drawing.Obviously, below only be the utility model part embodiment with the embodiment who describes, rather than whole embodiments.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment who is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
With reference to Fig. 1; The secondary voltage circuit 10 of the utility model comprises power supply 11, sectional pressure element 12, switching element 13 and control unit 14; Said sectional pressure element 12 is in parallel with said switching element 13; Said control unit 14 is connected in conducting or the disconnection to control said switching element 13 between said power supply 11 and the said switching element 13; The input end of said switching element 13 is connected to power supply 11; Its output terminal is connected to a fan 20 to be driven to realize that fan 20 is carried out the classification power supply, and this secondary voltage circuit 10 can change the driving voltage that fan 20 is applied, and is guaranteeing that the fan 20 normal backs that start are through reducing the noise that driving voltage reduces fan 20.
Specify the multiple physical circuit of realizing the utility model secondary voltage circuit 10 below in conjunction with Fig. 2 to Fig. 4.
Fig. 2 has showed the utility model first embodiment's circuit diagram; With reference to Fig. 2, in the present embodiment, the magnitude of voltage of power supply 11 is 12V; Switching element 13 is selected the first transistor Q1 for use; Sectional pressure element 13 is selected the first divider resistance R1 parallel with one another and the second divider resistance R2 for use, and control unit comprises charging capacitor C1, charging resistor R3 and the second and the 3rd transistor Q2 and Q3, wherein; Said the first transistor Q1 is the PNP transistor; Its emitter and collector meets power supply J1 and the fan J2 of 12V respectively, and said first, second divider resistance R1 and R2 are connected in parallel on the emitter and collector two ends of the first transistor Q1, and the said second and the 3rd transistor Q2 and Q3 are NPN transistor; Its common Darlington transistor of forming with high β value; And said charging capacitor C1 and charging resistor R3 form the RC integration circuit, and the two ends of this RC integration circuit link to each other with the base stage of transistor seconds Q2 in 12V power supply and the Darlington transistor respectively, and the collector electrode of said transistor seconds Q2 and Q3 is connected to emitter and the base stage of said the first transistor Q1 respectively through resistance R 4 and R5.In addition, it is chargeable to 12V with said charging capacitor C1 after guaranteeing said RC integration circuit integration to be connected with earth resistance R6 between said charging resistor R3 and the said transistor seconds Q2.In this preferred embodiment, said control unit 14 also comprises the protective circuit of being connected and being formed each other by diode D1 and earth resistance R7, and said diode D1 is connected between said charging capacitor C1 and the charging resistor R3.Design based on this protective circuit; When fan is in the shutdown off-position; Electric weight among the charging capacitor C1 can be bled off fast; (shutdown for the first time is too short with the blanking time of starting shooting for the second time) can't not make switching element Q1 be switched on because of the electric weight among the charging capacitor C1 bleeds off when preventing to carry out starting shooting the second time in the short time, causes starting fan voltage on the low side and influence the proper functioning of fan.Wherein, the setting of earth resistance R7 is to be damaged for the electric current that sparks that prevents charging capacitor C1 is excessive.
Based on the foregoing circuit structure Design; When secondary voltage circuit 10 is activated; Power supply 11 provides the voltage of 12V that the RC integration circuit is charged, and can form the little base current of a period of time this moment on the Darlington transistor that second, third transistor Q2 and Q3 are constituted, and this base current is through the high β amplification of Darlington transistor; Collector electrode at this Darlington transistor forms big electric current; Make the first transistor Q1 state (being that switching element is on state) that reaches capacity, thereby the voltage of the 12V that said power supply J1 provides then is loaded into fan 20 two ends fully, and fan 20 is normally started up.Holding time of starting fan voltage (12V) depended on the intergration time of charging capacitor C1 and charging resistor R3; For example; When the resistance value of getting 100uF and charging resistor R3 when the charging capacitor value of charging capacitor C1 was got 1M ohm, then starting fan voltage (12V) was held time and is about 80 seconds.
After charging capacitor C1 was full of electricity, after promptly the starting fan holding time of voltage arrived, Darlington transistor was closed; Then the first transistor Q1 also can stopping; The 12V voltage that provides of power supply 11 is depressed at the branch of divider resistance R1 and R2 so, and the driving voltage that is loaded into fan 20 two ends is lowered, and for example is reduced to 9.5V; Thereby make the fan reduction of speed, reach the purpose that reduces fan noise.
When equipment shuts down, 10 outages of secondary voltage circuit, then this circuit is inoperative, and fan does not have electric stall.The electric weight of storing among the charging capacitor C1 can bleed off through diode D1 fast, when starting shooting immediately after the equipment that prevents shuts down, does not make this circuit inoperative because of charging capacitor C1 bleeds off electricity again.
Fig. 3 has showed the circuit diagram in the utility model second embodiment, in this embodiment, is compared to first embodiment's main difference point: switching element 13 select for use metal oxide semiconductor field effect tube M1 for example PMOS manage to substitute the first transistor Q1.Correspondingly, select for use more powerful resistance R 8 and R9 to be used as divider resistance, because the saturation voltage drop of PMOS pipe is littler than transistor, this circuit improves the back and carries out secondary voltage control applicable to the DC fan to big electric current.
Fig. 4 has showed the circuit diagram in the utility model the 3rd embodiment; In this embodiment; Main difference point compared to first embodiment is: control unit 14 is used instead by original pure hardware circuit and is software and hardware combining; It is mainly realized by microcontroller (figure does not show) and the 4th transistor Q4; The general input GPIO of said microcontroller links to each other with the base stage of said the 4th transistor Q4 through resistance R 10, and the collector electrode of said the 4th transistor Q4 is connected to the base stage (when switching element is the source electrode that then is connected to metal oxide semiconductor field effect tube when adopting metal oxide semiconductor field effect tube) of the first transistor Q1 through resistance R 5.Said microcontroller can be opened transistor Q4 through general input GPIO is exported high level, thereby opens the first transistor Q1, realizes total head control starting fan; When the stipulated time then, microcontroller then can cut out general input GPIO, thereby closes transistor Q4 and Q1, this moment, fan obtained low voltage under the effect of divider resistance, thereby reduced fan noise.
As stated; The secondary voltage circuit that the utility model is used to reduce fan noise comes the break-make of control switch element and to fan secondary voltage is provided through control module, when switching element is in open mode, realizes that total head control fan normally starts; And when switching element is in closed condition; Under the dividing potential drop effect of sectional pressure element, the voltage that imposes on fan reduces, thereby reaches the purpose that reduces fan noise.
More than combine most preferred embodiment that the utility model is described, but the utility model is not limited to the embodiment of above announcement, and should contains various modification, equivalent combinations of carrying out according to the essence of the utility model.
Claims (8)
1. secondary voltage circuit that is used to reduce fan noise; It is characterized in that: the secondary voltage circuit comprises power supply, sectional pressure element, switching element and control unit; Said sectional pressure element and said switching element are in parallel; Said control unit is connected in conducting or the disconnection to control said switching element between said power supply and the said switching element, and the output terminal of said switching element is connected to said fan.
2. the secondary voltage circuit that is used to reduce fan noise as claimed in claim 1; It is characterized in that: said switching element is the first transistor or metal oxide semiconductor field effect tube; Said power supply is connected to the emitter of said the first transistor or the source electrode of said metal oxide semiconductor field effect tube, and said fan is connected to the drain electrode of the collector electrode or the said metal oxide semiconductor field effect tube of said the first transistor.
3. the secondary voltage circuit that is used to reduce fan noise as claimed in claim 2; It is characterized in that: said sectional pressure element comprises first divider resistance, and said first divider resistance is parallel between the collector and emitter of said the first transistor or is parallel between the source electrode and drain electrode of said metal oxide semiconductor field effect tube.
4. the secondary voltage circuit that is used to reduce fan noise as claimed in claim 3, it is characterized in that: said sectional pressure element also comprises second divider resistance, said first divider resistance and second divider resistance are parallel with one another.
5. the secondary voltage circuit that is used to reduce fan noise as claimed in claim 2; It is characterized in that: said control unit comprises RC integration circuit and Darlington transistor; Said RC integration circuit is made up of the charging capacitor and the charging resistor of mutual series connection; Said Darlington transistor is made up of transistor seconds and the 3rd transistor; Said charging resistor links to each other with the base stage of said the first transistor; The collector electrode of said transistor seconds is connected to the emitter of said the first transistor or the source electrode of metal oxide semiconductor field effect tube through a resistance, and the said the 3rd transistorized collector electrode is connected to the base stage of said the first transistor or the grid of metal oxide semiconductor field effect tube through a resistance.
6. the secondary voltage circuit that is used to reduce fan noise as claimed in claim 5 is characterized in that: be connected with one second earth resistance between said charging resistor and the said transistor seconds.
7. the secondary voltage circuit that is used to reduce fan noise as claimed in claim 5; It is characterized in that: said control unit also comprises protective circuit; Said protective circuit comprises the mutual diode in series and first earth resistance, and said diode is connected between said charging capacitor and the charging resistor.
8. the secondary voltage circuit that is used to reduce fan noise as claimed in claim 2; It is characterized in that: said control unit comprises microcontroller and the 4th transistor; The general input of said microcontroller links to each other with the said the 4th transistorized base stage through a resistance, and the said the 4th transistorized collector electrode is connected to the base stage of said the first transistor or the grid of metal oxide semiconductor field effect tube through a resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205671220U CN202468483U (en) | 2011-12-30 | 2011-12-30 | Secondary voltage circuit for lowering fan noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205671220U CN202468483U (en) | 2011-12-30 | 2011-12-30 | Secondary voltage circuit for lowering fan noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202468483U true CN202468483U (en) | 2012-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205671220U Expired - Fee Related CN202468483U (en) | 2011-12-30 | 2011-12-30 | Secondary voltage circuit for lowering fan noise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202468483U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840538A (en) * | 2015-01-13 | 2016-08-10 | 技嘉科技股份有限公司 | Fan system and fan control method |
| CN108953182A (en) * | 2018-06-14 | 2018-12-07 | 珠海格力电器股份有限公司 | Control device, method and the warm-air drier using the device of starting fan |
-
2011
- 2011-12-30 CN CN2011205671220U patent/CN202468483U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840538A (en) * | 2015-01-13 | 2016-08-10 | 技嘉科技股份有限公司 | Fan system and fan control method |
| CN105840538B (en) * | 2015-01-13 | 2018-08-03 | 技嘉科技股份有限公司 | Fan system and control method for fan |
| CN108953182A (en) * | 2018-06-14 | 2018-12-07 | 珠海格力电器股份有限公司 | Control device, method and the warm-air drier using the device of starting fan |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20161230 |