CN205841285U - A kind of fan speed regulation control circuit - Google Patents
A kind of fan speed regulation control circuit Download PDFInfo
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- CN205841285U CN205841285U CN201620693268.2U CN201620693268U CN205841285U CN 205841285 U CN205841285 U CN 205841285U CN 201620693268 U CN201620693268 U CN 201620693268U CN 205841285 U CN205841285 U CN 205841285U
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Abstract
This utility model is disclosed that a kind of fan speed regulation control circuit, including the pwm control circuit being automatically adjusted by detection variations in temperature, also includes the BUCK reduction voltage circuit regulating rotation speed of fan by controlling the change of blower fan supply voltage.Pwm control circuit feeds back to integrated circuit U1 by the change of temperature and resistance RT1 detection ambient temperature, sample temperature detection signal TEM, the pwm control signal PWM FAN that output pulse width is automatically adjusted；The PWM FAN control signal that BUCK reduction voltage circuit is exported by U1 controls conducting and the cut-off of switch triode Q1, thus regulates the size of blower fan supply voltage, reaches to realize the function of blower fan FAN1 stepless time adjustment.This utility model circuit is simple, easy to control, and response speed is fast, and reliability is high.
Description
Technical field
This utility model relates to fan speed regulation control circuit.
Background technology
In various Power Management Design manufacturing enterprises, in order to ensure the functional reliability of power supply product, at various middle low powers
In power module, or even powerful power-supply system rack, the heat dissipation problem solving product is essential, and for heat dissipation problem
Solution, the solution of more than 80% is to use blower fan to carry out the radiating mode of air blast cooling.
Dispelled the heat by blower fan, need the problem solved mainly to include noise problem and energy consumption problem.International and domestic
Under overall background to environmental issue pay attention to day by day, manufacturing green power supply becomes the common objective that each power supply enterprise is pursued, and power supply produces
Product quiet and energy-conservation thus become the research direction of each power supply enterprise.And the noise of blower fan to be solved and energy consumption problem, best
Way be to realize automatization's speed governing of blower fan, by the condition monitoring to environmental change, timely adjustment rotation speed of fan, thus
The effective utilization of high efficiency raising blower fan.
Current domestic and international each power supply manufacturing enterprise controls and the method for regulation rotation speed of fan is predominantly exported by single-chip microcomputer
Pwm signal is adjusted.The advantage of this method is easy to control, it is only necessary to peopleware enrolls blower fan in Single Chip Microcomputer (SCM) program
Signal controls function write chip, but owing to single-chip microcomputer is relatively costly, the performance requirement aspect to used blower fan simultaneously
Comparing and be also improved, blower fan price is of a relatively high, therefore is suitable only for entering in some carry the high cost power supply product of single-chip microcomputer
Exercise and use.But at some both without Single-chip Controlling, again cost is had the high performance-price ratio power supply product of high requirement simultaneously
Fan speed regulation controls, it is clear that the most applicable.
Utility model content
In order to meet the green energy conservation of miscellaneous high performance-price ratio power supply product and low noise requirement, this practicality on market
Novel providing a kind of fan speed regulation control circuit, when ambient temperature raises, the temperature and resistance resistance of negative temperature coefficient diminishes,
Sampled voltage signal reduces, and after pwm chip is modulated, the width of the PWM-FAN control signal pulse of output will increase,
Switch triode ON time increases so that the supply voltage of blower fan raises, and rotation speed of fan is accelerated, and air quantity increases, so that
Ambient temperature reduces.
This utility model the technical scheme is that a kind of fan speed regulation control circuit for realizing the requirement of above technology,
Control blower fan high-speed rotation when fan action regional temperature height, control blower fan low velocity when fan action regional temperature is low and turn
Dynamic, including the temperature sensing circuit of detection fan action regional temperature, control circuit and fan drive circuit, described control electricity
Road is connected with temperature sensing circuit and fan drive circuit respectively；Described temperature sensing circuit includes that reference power source, temperature are adopted
Sample resistance RT1 and divider resistance R1；Described temperature sampling resistance RT1 and divider resistance R1 be connected in reference power source outfan with
Between ground, temperature sampling resistance RT1 and divider resistance R1 junction form the detection signal output part of temperature sensing circuit；Described
Control circuit include pwm signal control chip, the detection signal output part of described temperature sensing circuit connects described PWM letter
The signal input part of number control chip U1, the outfan of pwm signal control chip U1 produces pwm signal, described pwm signal
Dutycycle increases with temperature and increases；Described fan drive circuit is connected between fan power and blower fan, drops including BUCK
Volt circuit and switch triode Q1；Described BUCK reduction voltage circuit includes storage capacitor E1, energy storage inductor L1 and fly-wheel diode
D1, described storage capacitor C1 are electrochemical capacitor, the anode of storage capacitor C1 and negative electrode respectively with power anode and the electricity of blower fan
Source negative electrode is connected, and the negative electrode of storage capacitor C1 is connected with one end of energy storage inductor L1, continuing described in another termination of energy storage inductor
The anode of stream diode D1, the negative electrode of sustained diode 1 connects the anode of storage capacitor E1；Fan power VCC gives a dinner for a visitor from afar the power supply of machine
Anode；The base stage of described switch triode Q1 connects described pwm signal, grounded emitter, and colelctor electrode connects described afterflow two
The anode of pole pipe D1.
This utility model circuit is simple, easy to control, and response speed is fast, and reliability is high.
Further, in above-mentioned fan speed regulation control circuit: described temperature sampling resistance RT1 is negative temperature coefficient
Temperature and resistance, one end of reference power source output termination divider resistance R1, the other end jointing temp sampling resistor RT1 of divider resistance R1
One end, the other end ground connection of temperature sampling resistance RT1.
Further, in above-mentioned fan speed regulation control circuit: described pwm chip U1 model is TL494, also wraps
Include current-limiting resistance R2, described current-limiting resistance R2 and be connected to the 1st pin and the inspection of described temperature of described pwm chip U1
Between the output of slowdown monitoring circuit.
Further, in above-mentioned fan speed regulation control circuit: also include current-limiting resistance R3 and current-limiting resistance R4, described
Current-limiting resistance R3 is connected between outfan and the base stage of switch triode Q1 of pwm signal control chip U1, current-limiting resistance R4
It is connected between outfan and the emitter stage of switch triode Q1 of pwm signal control chip U1.
Compared with other speed-regulating control circuit of market, this utility model has the advantage that
1, economical, low cost.
Due to application of the present utility model so that fan speed regulation control circuit can achieve wind on the basis of low cost
The stepless time adjustment of machine, not only reduces the Single-chip Controlling of high cost, and need not the speed governing using special price higher
Blower fan, can realize with two common line blower fans, greatly reduce the hardware cost of product.
2, simple, practical and reliable.
This utility model is simple and convenient, and device is few, and pure hardware circuit controls, and response speed is fast, and product is reliable, practicality
By force.
Below with reference to drawings and Examples, this utility model is described in detail.
Accompanying drawing explanation
Fig. 1 is this utility model embodiment schematic diagram.
Detailed description of the invention
As it is shown in figure 1, the present embodiment is a outdoor communication power source system, this power-supply system is equal due to power rectifier module
Sealing is placed in outdoor cabinet, and therefore outdoor cabinet needs to install blower fan specially in enclosure top and carry out air draft, and power supply is whole
During flow module work, produced heat emits in time.Temperature within outdoor cabinet is by outdoor ambient temperature and electricity
The impact of the factors such as source module workload condition, may time height time low, in order to ensure that blower fan does not turns when cabinet temperature is low
Or turn at a slow speed, turning soon when cabinet temperature height or turn at full speed, the most effectively save electric energy also reduces noise, and spy employs this practicality
Novel a kind of fan speed regulation control circuit, as it is shown in figure 1, to meet this outdoor communication power source system specifications.
As it is shown in figure 1, in the present embodiment, control blower fan high-speed rotation when power supply cabinet temperature height, make the temperature in rack
Degree quickly reduces, and controls blower fan low velocity when the temperature in rack is low and rotates, as it is shown in figure 1, this circuit includes detecting power supply
The temperature sensing circuit of machine in-cabinet temperature, control circuit and fan drive circuit, control circuit respectively with temperature sensing circuit and
Fan drive circuit is connected；In the present embodiment, temperature sampling resistance RT1 is the temperature and resistance of negative temperature coefficient, and reference power source is defeated
Go out to terminate one end of divider resistance R1, one end of other end jointing temp sampling resistor RT1 of divider resistance R1, temperature sampling resistance
The other end ground connection of RT1.
Control circuit includes pwm signal control chip, and the detection signal output part of temperature sensing circuit connects described PWM letter
The signal input part of number control chip U1, the outfan of pwm signal control chip U1 produces pwm signal, described pwm signal
Dutycycle increases with temperature and increases.
Fan drive circuit is connected between fan power and blower fan, including BUCK reduction voltage circuit and switch triode Q1；
BUCK reduction voltage circuit includes storage capacitor E1, energy storage inductor L1 and sustained diode 1, and described storage capacitor C1 is electrolysis electricity
Holding, the anode of storage capacitor C1 is connected with power anode and the power cathode of blower fan respectively with negative electrode, the negative electrode of storage capacitor C1
It is connected with one end of energy storage inductor L1, the anode of another sustained diode 1 described in termination of energy storage inductor, fly-wheel diode
The negative electrode of D1 connects the anode of storage capacitor E1；Fan power VCC gives a dinner for a visitor from afar the power anode of machine；The base stage of switch triode Q1 meets institute
The pwm signal stated, grounded emitter, colelctor electrode connects the anode of described sustained diode 1.
Put into practice in use process as it is shown in figure 1, temperature sensing circuit includes divider resistance R1, temperature sampling resistance RT1, limit
Leakage resistance R2, temperature sampling resistance RT1 are the temperature and resistance of negative temperature coefficient, its one end and divider resistance R1 and current limliting electricity
Resistance R2 is connected, other end ground connection；Another termination REF reference voltage of divider resistance R1；The current-limiting resistance R2 other end controls core with PWM
Sheet U1 the 1st foot is connected, to pwm chip input temp signal.Here, when machine in-cabinet temperature height, temperature sampling resistance RT1
Reducing, outfan TEM voltage reduces inside, and pwm chip U1 uses model to be TL494, its first pin input voltage
Time low, produce the pwm signal of relatively big space rate, when its first pin input voltage is higher, export the PWM letter of less dutycycle
Number.9th foot output PWM-FAN control signal of pwm chip.
BUCK reduction voltage circuit includes current-limiting resistance R3 and current-limiting resistance R4, switch triode Q1, energy storage inductor L1, energy storage electricity
Hold C1 and afterflow diode D1；The input of current-limiting resistance R3 is connected with one end of PWM-FAN control signal and resistance R4,
The other end is connected with the base stage of switch triode Q1；The grounded emitter of switch triode Q1, colelctor electrode and sustained diode 1
Positive pole and energy storage inductor L1 one end be connected；The negative pole of sustained diode 1 is electric with power supply together with the positive pole of storage capacitor
Source VCC is connected, and the power supply positive terminal of blower fan FAN1 is also connected on VCC simultaneously；The other end of energy storage inductor L1 and storage capacitor
Negative pole be connected on together on the negative terminal of blower fan power supply.
A kind of fan speed regulation control circuit in embodiment, its control principle is described below:
When ambient temperature raises or power module load is bigger, interior of equipment cabinet operating temperature increases, subzero temperature
The temperature and resistance RT1 resistance of degree coefficient will diminish so that the sampled voltage signal on temperature and resistance RT1 reduces, through PWM control
After chip U1 modulation, the width of the PWM-FAN control signal pulse of output will increase, and the ON time of switch triode Q1 increases
Adding so that the supply voltage VCC of blower fan FAN1 raises, rotation speed of fan is accelerated, and air quantity increases, so that interior of equipment cabinet work temperature
Degree reduces.
When ambient temperature reduces or power module load is lighter, interior of equipment cabinet operating temperature decreases, subzero temperature
The temperature and resistance RT1 resistance of degree coefficient will increase so that the sampled voltage signal on temperature and resistance RT1 raises, through PWM control
After chip U1 modulation, the width of the PWM-FAN control signal pulse of output will reduce, and the ON time of switch triode Q1 subtracts
Little so that the supply voltage VCC of blower fan FAN1 reduces, and rotation speed of fan slows down, air quantity reduces, it is achieved thereby that this power-supply system joint
Can be with the performance specification reducing noise.
In sum, this utility model one fan speed regulation control circuit passes through above example, it is achieved that power supply product
Energy-conservation with reduce noise performance specification, reached the control purpose of this utility model circuit.
Claims (4)
1. a fan speed regulation control circuit, controls blower fan high-speed rotation, fan action district when fan action regional temperature height
Control blower fan low velocity when territory temperature is low to rotate, including the temperature sensing circuit of detection fan action regional temperature, control circuit
And fan drive circuit, described control circuit is connected with temperature sensing circuit and fan drive circuit respectively；It is characterized in that:
Described temperature sensing circuit includes reference power source, temperature sampling resistance RT1 and divider resistance R1；Described temperature sampling
Resistance RT1 and divider resistance R1 is connected between reference power source outfan and ground, and temperature sampling resistance RT1 and divider resistance R1 is even
Meet place and form the detection signal output part of temperature sensing circuit；
Described control circuit includes pwm signal control chip, and the detection signal output part of described temperature sensing circuit meets institute
The signal input part of the pwm signal control chip U1 stated, the outfan of pwm signal control chip U1 produces pwm signal, described
The dutycycle of pwm signal increases with temperature and increases；
Described fan drive circuit is connected between fan power and blower fan, including BUCK reduction voltage circuit and switch triode
Q1；
Described BUCK reduction voltage circuit includes storage capacitor E1, energy storage inductor L1 and sustained diode 1, described storage capacitor
C1 is electrochemical capacitor, and the anode of storage capacitor C1 is connected with power anode and the power cathode of blower fan respectively with negative electrode, energy storage electricity
The negative electrode holding C1 is connected with one end of energy storage inductor L1, the anode of another diode D1 described in termination of energy storage inductor, afterflow
The negative electrode of diode D1 connects the anode of storage capacitor E1；Fan power VCC gives a dinner for a visitor from afar the power anode of machine；
The base stage of described switch triode Q1 connects described pwm signal, grounded emitter, and colelctor electrode meets described diode D1
Anode.
Fan speed regulation control circuit the most according to claim 1, it is characterised in that: described temperature sampling resistance RT1 is
The temperature and resistance of negative temperature coefficient, one end of reference power source output termination divider resistance R1, another termination temperature of divider resistance R1
Degree one end of sampling resistor RT1, the other end ground connection of temperature sampling resistance RT1.
Fan speed regulation control circuit the most according to claim 2, it is characterised in that: described pwm chip U1 model
For TL494, also include current-limiting resistance R2, described current-limiting resistance R2 be connected to the 1st pin of described pwm chip U1 with
Between the output of described temperature sensing circuit.
4. according to the fan speed regulation control circuit described in claim 1 or 2 or 3, it is characterised in that: also include current-limiting resistance R3 and
Current-limiting resistance R4, described current-limiting resistance R3 are connected to the outfan of pwm signal control chip U1 and the base of switch triode Q1
Between pole, current-limiting resistance R4 is connected between outfan and the emitter stage of switch triode Q1 of pwm signal control chip U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620693268.2U CN205841285U (en) | 2016-07-01 | 2016-07-01 | A kind of fan speed regulation control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620693268.2U CN205841285U (en) | 2016-07-01 | 2016-07-01 | A kind of fan speed regulation control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205841285U true CN205841285U (en) | 2016-12-28 |
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ID=58149631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620693268.2U Active CN205841285U (en) | 2016-07-01 | 2016-07-01 | A kind of fan speed regulation control circuit |
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| CN (1) | CN205841285U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109185212A (en) * | 2018-11-09 | 2019-01-11 | 厦门拓宝科技有限公司 | A kind of DC fan alignment circuit |
| CN111963469A (en) * | 2019-05-20 | 2020-11-20 | 鸿富锦精密工业(武汉)有限公司 | Fan control circuit and electronic device |
| CN115585155A (en) * | 2022-11-07 | 2023-01-10 | 东方博沃（北京）科技有限公司 | Fan rotating speed control device |
-
2016
- 2016-07-01 CN CN201620693268.2U patent/CN205841285U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109185212A (en) * | 2018-11-09 | 2019-01-11 | 厦门拓宝科技有限公司 | A kind of DC fan alignment circuit |
| CN109185212B (en) * | 2018-11-09 | 2024-04-09 | 厦门拓宝科技有限公司 | Speed regulating circuit of direct current fan |
| CN111963469A (en) * | 2019-05-20 | 2020-11-20 | 鸿富锦精密工业(武汉)有限公司 | Fan control circuit and electronic device |
| CN115585155A (en) * | 2022-11-07 | 2023-01-10 | 东方博沃（北京）科技有限公司 | Fan rotating speed control device |
| CN115585155B (en) * | 2022-11-07 | 2023-08-29 | 东方博沃（北京）科技有限公司 | Fan rotating speed control device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 518000 Floors 1-3 and 1-5 of Block A, Block B2, Jinweiyuan Industrial Plant, Longshan District, Pingshan New District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Gold Power Technology Co., Ltd. Address before: 518000 Shenzhen, Guangdong, Pingshan new industrial zone, poly dragon hill area Jinwei Industrial Zone A 1 floor. Patentee before: Shenzhen Gold Power Technology Co., Ltd. |
|
| CP02 | Change in the address of a patent holder |