CN207004886U - A kind of circuit for controlling speed of fan for projection mobile phone - Google Patents
A kind of circuit for controlling speed of fan for projection mobile phone Download PDFInfo
- Publication number
- CN207004886U CN207004886U CN201720628147.4U CN201720628147U CN207004886U CN 207004886 U CN207004886 U CN 207004886U CN 201720628147 U CN201720628147 U CN 201720628147U CN 207004886 U CN207004886 U CN 207004886U
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- China
- Prior art keywords
- fan
- pressure difference
- low pressure
- voltage regulator
- linear voltage
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Cooling Or The Like Of Electrical Apparatus (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The utility model discloses a kind of circuit for controlling speed of fan for projection mobile phone, control circuit includes controller, digital regulation resistance, adjustable low pressure difference linear voltage regulator, temperature sensor and fan, temperature sensor is connected with controller, digital regulation resistance is connected with controller, digital regulation resistance is connected with adjustable low pressure difference linear voltage regulator, input power is connected with adjustable low pressure difference linear voltage regulator, and fan is connected on adjustable low pressure difference linear voltage regulator.The utility model dynamically adjusts rotation speed of the fan according to the real time temperature of system so that product noise and temperature rise are all in a preferable controllable levels, so as to greatly improve the reliability of product and user experience.
Description
Technical field
The utility model discloses a kind of projection mobile phone, particularly a kind of circuit for controlling speed of fan for projection mobile phone,
Belong to projection mobile phone technical field.
Background technology
In view of mobile phone have the characteristics that it is thin, light, after such product adds projecting function, because power consumption increase, temperature liter
Height, system radiating become a thorny problem, are an effective solutions by fan cooling.In traditional design
In method, the temperature of whole system can be reduced by directly improving the terminal voltage of two line fans, but this method can cause
Fan is constantly in the state of high-speed rotation, while the noise that fan high-speed rotation is brought can give people to carry out using projection mobile phone
Very big trouble is brought during call.
When therefore carrying out heat dissipation design to this kind of product, under the premise of two low line fans of small volume, cost are paid the utmost attention to,
How the rotating speeds of two line fans being controlled while reducing noise becomes one of key of projection mobile phone design.
The content of the invention
For the temperature of the prior art conducted according to temperature sensor mentioned above, pass through MCU controller logarithms
Word potentiometer is controlled the feedback resistance for changing adjustable low pressure difference linear voltage regulator LDO, so as to adjust LDO output voltage,
The rotating speed for reaching control fan balances projection mobile phone noise purpose to realize.
The utility model solves the technical scheme that its technical problem uses：A kind of rotation speed of the fan control for projection mobile phone
Circuit processed, control circuit include controller, digital regulation resistance, adjustable low pressure difference linear voltage regulator, temperature sensor and fan, temperature
Degree sensor is connected with controller, and digital regulation resistance is connected with controller, digital regulation resistance and adjustable low pressure difference linear voltage regulator
Connection, input power are connected with adjustable low pressure difference linear voltage regulator, and fan is connected on adjustable low pressure difference linear voltage regulator.
The technical scheme that the utility model solves the use of its technical problem further comprises：
Described digital regulation resistance uses model MAX5461 tunable digital potentiometer U2, adjustable type low pressure difference linearity
Voltage-stablizer uses model ME6221 adjustable type low pressure difference linear voltage regulator U1.
Described input power is connected on adjustable type low pressure difference linear voltage regulator U1 power input pin, and fan is connected to
On adjustable type low pressure difference linear voltage regulator U1 power supply output pin, one of tunable digital potentiometer U2 controlled adjustable resistance Ra
Pin is grounded, and another pin is connected to adjustable type low pressure difference linear voltage regulator U1 feedback voltage input pin.
The beneficial effects of the utility model are：The utility model dynamically adjusts fan according to the real time temperature of system and turned
Speed so that product noise and temperature rise all in a preferable controllable levels, so as to greatly improve the reliability of product and
User experience.
The utility model is described further below in conjunction with the drawings and specific embodiments.
Brief description of the drawings
Fig. 1 is the utility model circuit block diagram.
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
The present embodiment is the utility model preferred embodiment, and other all its principle and basic structure are identical with the present embodiment
Or it is approximate, within scope of protection of the utility model.
Accompanying drawing 1 and accompanying drawing 2 are refer to, the utility model mainly includes controller, digital regulation resistance, adjustable low pressure difference linearity
Voltage-stablizer, temperature sensor and fan, temperature sensor are connected with controller, and input temp information is to controller, digital current potential
Device is connected with controller, and controller output control signal is to digital regulation resistance, and to change its resistance, digital regulation resistance is with that can turn down
Pressure difference linear voltage regulator connects, and digital regulation resistance resistance value gives adjustable low pressure difference linear voltage regulator, and input power is with that can turn down
Pressure difference linear voltage regulator connects, and input power gives adjustable low pressure difference linear voltage regulator, and it is steady that fan is connected to adjustable low pressure difference linearity
On depressor, adjustable low pressure difference linear voltage regulator out-put supply is powered, i.e., input power passes through adjustable low voltage difference to fan to fan
Linear voltage regulator is powered to fan.
In the present embodiment, digital regulation resistance uses model MAX5461 tunable digital potentiometer U2, and its PIN1 is power supply
Input pin, PIN2 grounding legs, PIN4 and PIN3 are resistance sizes control signal pins, controlled equivalent to one between PIN5 and PIN6
Adjustable resistance Ra, its scope is between 0 Ω m-100K Ω.In the present embodiment, adjustable type low pressure difference linear voltage regulator uses model
Adjustable type low pressure difference linear voltage regulator U1, its PIN1 for ME6221 are power input pin, and PIN2 grounding legs, PIN3 is enabled control
Pin processed, PIN4 are feedback voltage input pins, and PIN5 is power supply output pin.Tunable digital potentiometer U2 PIN5 pins ground connection, can
Digital regulation resistance U2 PIN6 pins are adjusted to be connected with adjustable type low pressure difference linear voltage regulator U1 feedback voltage input pin.
VIN is input voltage, and input voltage is connected on the power input pin of adjustable type low pressure difference linear voltage regulator,
VOUT_FAN is the control voltage for being carried in fan both ends, the power supply output pin out-put supply of adjustable type low pressure difference linear voltage regulator
To fan, RES_EN and RES_UD signals come from MCU controllers and are used to increasing or reducing tunable digital potentiometer U2's
Resistance Ra sizes between PIN5 and PIN6, then
VOUT_FAN=1.25* (1+R1/ (R2+Ra)), i.e. the control reference voltage at fan both ends is about 2.2V-5V.
When MCU controllers detect that temperature is too high by temperature sensor, then RES_EN signals are dragged down, simultaneously will
RES_UD signals are dragged down by height, and MAX5460 PIN5 and PIN6 resistance Ra can reduce, and be carried in the voltage VOUT_ at fan both ends
FAN will become big, can be improved so as to the rotating speed of fan, so as to can more preferably reduce the temperature of system；
When MCU controllers detect that temperature is too low by temperature sensor, RES_EN signals are dragged down, while by RES_
UD signals are drawn high by low, and MAX5460 PIN5 and PIN6 resistance Ra can increase, and the voltage VOUT_FAN for being carried in fan both ends will
It can reduce, can slow down so as to the rotating speed of fan, so as to can more preferably reduce the noise of system.
In the utility model, according to the actual conditions of system temperature, R2 resistance size is adjusted, thus it is possible to vary fan end electricity
Press VOUT_FAN magnitude range；It can also be realized by changing more powerful adjustable type linear voltage regulator U1 to higher electricity
The requirement that pressure rotation speed of the fan is controlled.
The utility model passes through the temperature that is obtained to temperature sensor from the angle of adjustment fan voltage, MCU controllers
Degree carries out processing judgement, then changes adjustable low pressure difference linear voltage regulator LDO feed back input resistance using digital regulation resistance
Reach and change fan both end voltage, control rotation speed of the fan to realize the purpose of dynamic equilibrium projection mobile phone noise.
For the utility model according to the characteristics of mobile phone projection small product size is small, heat power consumption is larger, the line of small size two of selection is straight
Flow fan power consumption can change in 0.5W or so, its rotating speed according to the both end voltage size of loading.Accordingly, made an uproar caused by fan
Sound can also change according to its rotation speed change.When the voltage for being carried in fan both ends is excessive, its caused noise and vibration
Also the user experience of product can be had a strong impact on.
When the temperature that MCU controllers are obtained by temperature sensor exceedes the warning line of setting, can be added by its I/O port
The resistance of big digital regulation resistance improves LDO feedback voltage, and the rotating speed of fan is improved so as to improve LDO output voltage；
On the contrary, when the temperature that MCU controllers are obtained by temperature sensor is relatively low, the resistance of digital regulation resistance can be reduced by its I/O port
Value reduces LDO feedback voltage, so as to reduce LDO output voltage and reduce the rotating speed of fan.
The utility model dynamically adjusts rotation speed of the fan according to the real time temperature of system so that product noise and temperature rise are all
In a preferable controllable levels, so as to greatly improve the reliability of product and user experience.
Claims (3)
1. a kind of circuit for controlling speed of fan for projection mobile phone, it is characterized in that：Described control circuit includes controller, number
Word potentiometer, adjustable low pressure difference linear voltage regulator, temperature sensor and fan, temperature sensor are connected with controller, numeral electricity
Position device is connected with controller, and digital regulation resistance is connected with adjustable low pressure difference linear voltage regulator, input power and adjustable low voltage difference line
Property voltage-stablizer connection, fan is connected on adjustable low pressure difference linear voltage regulator.
2. the circuit for controlling speed of fan according to claim 1 for projection mobile phone, it is characterized in that：Described numeral electricity
Position device uses model MAX5461 tunable digital potentiometer U2, and adjustable type low pressure difference linear voltage regulator uses model
ME6221 adjustable type low pressure difference linear voltage regulator U1.
3. the circuit for controlling speed of fan according to claim 1 for projection mobile phone, it is characterized in that：Described input electricity
Source is connected on the power input pin of adjustable type low pressure difference linear voltage regulator, and fan is connected to adjustable type low pressure difference linear voltage regulator
Power supply output pin on, the controlled adjustable resistance Ra of tunable digital potentiometer pin ground connection, another pin is connected to
The feedback voltage input pin of adjustable type low pressure difference linear voltage regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720628147.4U CN207004886U (en) | 2017-06-01 | 2017-06-01 | A kind of circuit for controlling speed of fan for projection mobile phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720628147.4U CN207004886U (en) | 2017-06-01 | 2017-06-01 | A kind of circuit for controlling speed of fan for projection mobile phone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207004886U true CN207004886U (en) | 2018-02-13 |
Family
ID=61445900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720628147.4U Expired - Fee Related CN207004886U (en) | 2017-06-01 | 2017-06-01 | A kind of circuit for controlling speed of fan for projection mobile phone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207004886U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111323948A (en) * | 2020-04-07 | 2020-06-23 | 深圳市爱图仕影像器材有限公司 | Drive circuit of liquid crystal light valve, liquid crystal light valve and LED lamp |
| CN114421833A (en) * | 2022-03-29 | 2022-04-29 | 浙江齐安信息科技有限公司 | Control device for two-wire DC fan |
-
2017
- 2017-06-01 CN CN201720628147.4U patent/CN207004886U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111323948A (en) * | 2020-04-07 | 2020-06-23 | 深圳市爱图仕影像器材有限公司 | Drive circuit of liquid crystal light valve, liquid crystal light valve and LED lamp |
| CN111323948B (en) * | 2020-04-07 | 2021-11-05 | 深圳市爱图仕影像器材有限公司 | Drive circuit of liquid crystal light valve, liquid crystal light valve and LED lamp |
| CN114421833A (en) * | 2022-03-29 | 2022-04-29 | 浙江齐安信息科技有限公司 | Control device for two-wire DC fan |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180213 Termination date: 20200601 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |