CN219012942U - Intelligent fan driving circuit - Google Patents
Intelligent fan driving circuit Download PDFInfo
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- CN219012942U CN219012942U CN202222626191.5U CN202222626191U CN219012942U CN 219012942 U CN219012942 U CN 219012942U CN 202222626191 U CN202222626191 U CN 202222626191U CN 219012942 U CN219012942 U CN 219012942U
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- switching tube
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- 239000003990 capacitor Substances 0.000 claims description 35
- 230000017525 heat dissipation Effects 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model provides an intelligent fan driving circuit which comprises a signal input end, a first control component and a second control component, wherein the signal input end is used for outputting a signal, and the first control component is connected with the signal input end and is used for outputting a control signal according to the output signal. The second control assembly is connected with the power supply, the fan and the output end of the first control assembly, the second control assembly is connected between the power supply and the fan, and the second control assembly is used for changing the power supply voltage of the fan according to the control signal, so that the rotating speed of the fan is changed, and the wind noise of the fan is changed. The rotating speed of the fan is controlled according to the actual output power of the power amplifier, so that wind noise is controlled, the working stability of the power amplifier can be ensured, long-time wind noise can be avoided, and the use experience sense of a customer is improved.
Description
Technical Field
The utility model relates to the technical field of power amplification, in particular to an intelligent fan driving circuit.
Background
High power amplifiers typically require the use of fans to dissipate heat to ensure proper and stable operation of the machine. Currently, most of the power amplifier products in the market use a constant voltage mode to drive a fan for heat dissipation. This way of driving with constant voltage has major drawbacks. The heat dissipation is ensured to be good, but the wind noise is overlarge, or the wind noise is reduced, but the heat dissipation is poor, and only one can be selected.
In view of this, how to reduce wind noise while ensuring heat dissipation is a technical problem that needs to be solved in the art.
Disclosure of Invention
The utility model aims to provide an intelligent fan driving circuit.
The utility model aims to solve the problem that the heat dissipation of a fan and wind noise of the existing power amplifier cannot be balanced.
In order to solve the problems, the utility model is realized by the following technical scheme:
an intelligent fan drive circuit, comprising:
the signal input end is used for outputting a signal;
the first control component is connected with the signal input end and is used for outputting a control signal according to the output signal;
the second control assembly is connected with a power supply, a fan and the output end of the first control assembly, the second control assembly is connected between the power supply and the fan, and the second control assembly is used for changing the power supply voltage of the fan according to the control signal.
Further, the first control component comprises a sixth resistor, a first diode, a ninth resistor, a first switch tube and a first filter component connected between the first diode and the ninth resistor, wherein the sixth resistor, the first diode, the ninth resistor and the first switch tube are sequentially connected with the signal input end in series, the other end of the first filter component is grounded, the anode of the first diode is connected with the sixth resistor, and the second control component is connected with the first switch tube.
Further, the first switching tube is an NPN triode, the ninth resistor is connected with the base electrode of the first switching tube, and the emitter electrode of the first switching tube is grounded and the collector electrode of the first switching tube is connected with the second control assembly.
Further, the first filtering component comprises an eighth resistor and a fourth capacitor which are connected in parallel, the fourth capacitor is an electrolytic capacitor, and the negative electrode of the fourth capacitor is grounded.
Further, the second control assembly comprises a second switch tube connected with the first control assembly, a first resistor connected in parallel with two ends of the second switch tube, and a second filter assembly connected between the power supply and the second switch tube, wherein the other end of the second filter assembly is connected with the first control assembly.
Further, the second switch tube is a PMOS tube, a source electrode of the second switch tube is connected with the power supply, a grid electrode of the second switch tube is connected with the first control component, and a drain electrode of the second switch tube is connected with the fan; the first resistor is connected in parallel between the drain electrode and the source electrode of the second switching tube.
Further, the second filter assembly comprises a second resistor, a second capacitor and a second diode which are connected in parallel, and the anode of the second diode is connected with the first control assembly.
Further, the second control assembly further comprises a third capacitor and a fifth resistor, wherein the third capacitor and the fifth resistor are connected to the drain electrode of the second switching tube, the third capacitor is an electrolytic capacitor, the negative electrode of the third capacitor is grounded, and the other end of the fifth resistor is connected with the fan.
Further, a first capacitor is further connected between the power supply and the second control component, and the negative electrode of the first capacitor is grounded.
Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:
(1) According to the utility model, the control signal of the first control component is controlled through the output signal of the signal input end, so that the second control component is controlled to change the power supply voltage of the fan, and then the rotating speed of the fan is changed, namely the wind noise of the fan is changed, and the rotating speed of the fan is controlled according to the actual output power of the power amplifier, so that the wind noise is controlled, the working stability of the power amplifier can be ensured, the long-time wind noise can be avoided, and the use experience sense of a customer is improved.
(2) The utility model controls the on-off of the second switching tube through the on-off of the first switching tube, and amplifies the signal current of the signal input end through the first switching tube, thereby rapidly filling the parasitic capacitance of the second switching tube and further rapidly controlling the on-off of the second switching tube.
Drawings
Fig. 1 is a schematic diagram of an intelligent fan driving circuit according to an embodiment of the present utility model.
Illustration of:
signal input terminal-100; a first control component-200; a first filtering component-210; a second control assembly-300; a second filtering component-320; a power supply-400; fan-500.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, an intelligent fan driving circuit includes a signal input end 100, a first control component 200 and a second control component 300, wherein the signal input end 100 is used for outputting a signal, and the first control component 200 is connected with the signal input end 100 and is used for outputting a control signal according to the output signal. The second control assembly 300 is connected to the power supply 400, the fan 500 and the output end of the first control assembly 200, the second control assembly 300 is connected between the power supply 400 and the fan 500, and the second control assembly 300 is used for changing the power supply voltage of the fan 500 according to the control signal, so as to change the rotation speed of the fan 500 and further change the wind noise of the fan 500.
The first control component 200 includes a sixth resistor R6, a first diode D1, a ninth resistor R9, a first switching tube Q1, and a first filter component 210 connected between the first diode D1 and the ninth resistor R9, where the other end of the first filter component 210 is grounded, the anode of the first diode D1 is connected to the sixth resistor R6, and the second control component 300 is connected to the first switching tube Q1.
In this embodiment, the first switching tube Q1 is an NPN transistor, the ninth resistor R9 is connected to the base of the first switching tube Q1, the emitter of the first switching tube Q1 is grounded, and the collector of the first switching tube Q1 is connected to the second control assembly 300.
The second control assembly 300 includes a second switching tube Q2 connected to the first control assembly 200, a first resistor R1 connected in parallel to both ends of the second switching tube Q2, and a second filter assembly 310 connected between the power supply 400 and the second switching tube Q2, and the other end of the second filter assembly 310 is connected to the first control assembly 200. In this embodiment, the second switching tube Q2 is a PMOS tube, the source of the second switching tube Q2 is connected to the power supply 400, the gate is connected to the first control component 200, the drain is connected to the fan 500, and the first resistor R1 is connected in parallel between the drain and the source of the second switching tube Q2.
When the power amplifier has no output or low output power, the signal input terminal 100 has a low output level, which is insufficient to drive the first switching tube Q1 to conduct. When the first switching tube Q1 is turned off, the second switching tube Q2 is thereby turned off. At this time, the power supply of the fan 500 is provided after the current is limited by the first resistor R1, and the fan 500 is in the low rotation speed mode, so as to achieve the effect of reducing wind noise. The fan rotating speed in the static state can be controlled by adjusting the resistance value of R1.
When the output power of the power amplifier is relatively large, the temperature of the power amplifier module begins to rise. At the same time, as the output power increases, the output level of the signal input terminal 100 increases. When the output level reaches a set value, the first switching tube Q1 starts to be conducted, so that the second switching tube Q2 is conducted, the first resistor R1 is bypassed, the fan supply voltage is the power supply voltage, the fan enters a high-speed running mode, the effect of rapid heat dissipation is achieved, and therefore the stability of the power amplifier is improved.
The rotating speed of the fan is controlled according to the input power of the power amplifier, so that the fan enters a low rotating speed when the power amplifier outputs low power, wind noise is reduced, the rotating speed of the fan is increased only when the power amplifier outputs high power, the working stability of the power amplifier is maintained, meanwhile, long-time wind noise is avoided as much as possible, and the use experience of a customer is improved. For example, when the fan driving circuit is applied to a music player, the high-speed running of the fan can generate larger wind noise due to larger output power of the power amplifier, but the wind noise can be completely covered by music at the moment, so that the wind noise generated by the fan is not easy to be perceived by human ears. When the output power is reduced, namely the music sound is reduced, the fan immediately shifts to a low-rotation-speed mode, and wind noise is basically not generated.
The first filter assembly 210 of the present embodiment includes an eighth resistor R8 and a fourth capacitor C4 connected in parallel, the fourth capacitor C4 is an electrolytic capacitor, the negative electrode of the fourth capacitor C4 is grounded, and the first filter assembly 210 filters the output signal.
The second filtering component 310 includes a second resistor R2, a second capacitor C2 and a second diode D2 connected in parallel, where an anode of the second diode D2 is connected to the first control component 200, and the second filtering component 310 filters the power.
The second control component 300 further includes a third capacitor C3 and a fifth resistor R5 connected to the drain of the second switching tube Q2, where the third capacitor C3 is an electrolytic capacitor, the negative electrode of the third capacitor C3 is grounded, and the other end of the fifth resistor R5 is connected to the fan 500.
A first capacitor C1 is further connected between the power supply 400 and the second control component 300, a negative electrode of the first capacitor C1 is grounded, and the first capacitor C1 stabilizes the voltage of the power supply.
While the foregoing description illustrates and describes the preferred embodiments of the present utility model, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, but is capable of use in various other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept, either as described above or as a matter of skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.
Claims (9)
1. An intelligent fan drive circuit, comprising:
the signal input end is used for outputting a signal;
the first control component is connected with the signal input end and is used for outputting a control signal according to the output signal;
the second control assembly is connected with a power supply, a fan and the output end of the first control assembly, the second control assembly is connected between the power supply and the fan, and the second control assembly is used for changing the power supply voltage of the fan according to the control signal.
2. The intelligent fan driving circuit according to claim 1, wherein the first control component comprises a sixth resistor, a first diode, a ninth resistor, a first switching tube and a first filter component connected between the first diode and the ninth resistor, the other end of the first filter component is grounded, the anode of the first diode is connected with the sixth resistor, and the second control component is connected with the first switching tube.
3. The intelligent fan drive circuit according to claim 2, wherein the first switching tube is an NPN transistor, the ninth resistor is connected to the base of the first switching tube, and the emitter and collector of the first switching tube are connected to the ground and the second control assembly.
4. The intelligent fan drive circuit according to claim 2, wherein the first filter assembly comprises an eighth resistor and a fourth capacitor connected in parallel, the fourth capacitor is an electrolytic capacitor, and a negative electrode of the fourth capacitor is grounded.
5. The intelligent fan drive circuit according to claim 1, wherein the second control assembly comprises a second switching tube connected with the first control assembly, a first resistor connected in parallel with two ends of the second switching tube, and a second filter assembly connected between the power supply and the second switching tube, and the other end of the second filter assembly is connected with the first control assembly.
6. The intelligent fan drive circuit according to claim 5, wherein the second switching tube is a PMOS tube, a source of the second switching tube is connected to the power supply, a gate of the second switching tube is connected to the first control component, and a drain of the second switching tube is connected to the fan; the first resistor is connected in parallel between the drain electrode and the source electrode of the second switching tube.
7. The intelligent fan drive circuit according to claim 5, wherein the second filter assembly comprises a second resistor, a second capacitor and a second diode connected in parallel, wherein an anode of the second diode is connected to the first control assembly.
8. The intelligent fan driving circuit according to claim 6, wherein the second control assembly further comprises a third capacitor and a fifth resistor connected to the drain of the second switching tube, the third capacitor is an electrolytic capacitor, the negative electrode of the third capacitor is grounded, and the other end of the fifth resistor is connected to the fan.
9. The intelligent fan drive circuit according to claim 1, wherein a first capacitor is further connected between the power supply and the second control assembly, and a negative electrode of the first capacitor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222626191.5U CN219012942U (en) | 2022-10-08 | 2022-10-08 | Intelligent fan driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222626191.5U CN219012942U (en) | 2022-10-08 | 2022-10-08 | Intelligent fan driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219012942U true CN219012942U (en) | 2023-05-12 |
Family
ID=86246315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222626191.5U Active CN219012942U (en) | 2022-10-08 | 2022-10-08 | Intelligent fan driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219012942U (en) |
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2022
- 2022-10-08 CN CN202222626191.5U patent/CN219012942U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An Intelligent Fan Driver Circuit Granted publication date: 20230512 Pledgee: Xiamen Bank Co.,Ltd. Pledgor: XIAMEN AKS ELECTRONICS CO.,LTD. Registration number: Y2024980000840 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |