CN206468568U - Rotation speed of the fan temperature-control circuit - Google Patents
Rotation speed of the fan temperature-control circuit Download PDFInfo
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- CN206468568U CN206468568U CN201720151905.8U CN201720151905U CN206468568U CN 206468568 U CN206468568 U CN 206468568U CN 201720151905 U CN201720151905 U CN 201720151905U CN 206468568 U CN206468568 U CN 206468568U
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- 238000001514 detection method Methods 0.000 claims abstract description 16
- 230000000630 rising effect Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
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- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The utility model discloses a kind of rotation speed of the fan temperature-control circuit, including temperature detection drive circuit and return difference circuit, the return difference circuit provides driving current for temperature detection drive circuit, temperature is prevented to be increased to fan and rise when turning temperature, fan repeatedly starting and stopping, the temperature detection drive circuit includes negative tempperature coefficient thermistor NTC, triode Q1, diode D1, resistance R1~R2, fan FAN, wherein thermistor NTC and resistance R1, R2, which is sequentially connected in series, to be followed by between power supply and ground, resistance R1 and resistance R2 connecting node connecting triode Q1 base stage, triode Q1 grounded emitter, triode Q1 colelctor electrode connects one end of fan, the other end connection power supply of fan, diode D1 is attempted by fan FAN two ends, and diode D1 negative pole connection power supply.When the utility model can prevent that fan low current from starting according to the change of temperature to control the electric capacity in the change of rotation speed of the fan, return difference circuit to make, the problem of possibly can not starting.
Description
Technical field
The utility model belongs to electronic technology field, and in particular to a kind of rotation speed of the fan temperature-control circuit.
Background technology
Existing circuit for controlling speed of fan generally uses temperature sensing circuit, and is controlled using single-chip microcomputer, circuit
Complicated, cost is high.
Utility model content
The utility model technical issues that need to address are to provide the rotation speed of the fan temperature that a kind of circuit structure is simple, cost is low
Degree control circuit.
To solve the above problems, technical solution adopted in the utility model is：
A kind of rotation speed of the fan temperature-control circuit, including temperature detection drive circuit and return difference circuit, the return difference circuit
Driving current is provided for temperature detection drive circuit, prevents temperature to be increased to fan and rise when turning temperature, fan repeatedly starting and stopping is described
Temperature detection drive circuit includes negative tempperature coefficient thermistor NTC, triode Q1, diode D1, resistance R1~R2, fan
FAN, wherein negative tempperature coefficient thermistor NTC and resistance R1, R2, which are sequentially connected in series, to be followed by between power supply and ground, resistance R1
With resistance R2 connecting node connecting triode Q1 base stage, triode Q1 grounded emitter, triode Q1 colelctor electrode connects
One end of wind-receiving fan, the other end connection power supply of fan, diode D1 is attempted by fan FAN two ends, and diode D1's is negative
Pole connects power supply, and resistance R1, R2 value is different, and it is different with temperature is completely turned that the rising of institute's control fan turns temperature.
Further, the return difference circuit includes resistance R3~R6, triode Q2, and three are connected to after resistance R3, R4 series connection
In pole pipe Q2 colelctor electrodes and temperature detection drive circuit between triode Q1 base stage, power supply is connected to after resistance R5, R6 series connection
And in temperature detection drive circuit between triode Q1 colelctor electrode, resistance R5 and resistance R6 connecting node connecting triode Q2
Base stage.
Further, the return difference circuit also includes electric capacity C1, and electric capacity C1 is in parallel with resistance R3.
It is using the beneficial effect produced by above-mentioned technical proposal：
The utility model can control the change of rotation speed of the fan according to the change of temperature, and the rising of fan turns temperature can root
According to needing to be configured, this is new to be provided with return difference circuit, can prevent fan reached turn temperature startup when, opening repeatedly
Stop, and the electric capacity in the return difference circuit is when can also make to prevent that fan low current from starting, the problem of possibly can not starting.
Brief description of the drawings
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
Utility model is described in further detail below in conjunction with the accompanying drawings：
The utility model is a kind of rotation speed of the fan temperature-control circuit.Including negative tempperature coefficient thermistor NTC, NPN tri-
Pole pipe Q1, PNP triode Q2, diode D1, electric capacity C1, C2, resistance R1~R6.The utility model realizes that function is as follows：Work as temperature
When spending relatively low, fan does not turn, when temperature, which has risen to, turns temperature (T_start), and fan starts to rotate, and is raised with temperature, turns
Speed increase, temperature rises to when completely turning temperature (T_full), and fan completely turns.
As shown in figure 1, the utility model includes temperature detection drive circuit and return difference circuit, the return difference circuit is temperature
Detect that drive circuit provides driving current, prevent temperature to be increased to fan and rise when turning temperature, fan repeatedly starting and stopping, the temperature inspection
Survey drive circuit include negative tempperature coefficient thermistor NTC, triode Q1, diode D1, resistance R1~R2, fan FAN, wherein
Negative tempperature coefficient thermistor NTC and resistance R1, R2, which are sequentially connected in series, to be followed by between power supply and ground, resistance R1 and resistance R2
Connecting node connecting triode Q1 base stage, triode Q1 grounded emitter, triode Q1 colelctor electrode connection fan
One end, the other end connection power supply of fan, diode D1 is attempted by fan FAN two ends, and diode D1 negative pole connection electricity
Source, resistance R1, R2 value is different, and it is different with temperature is completely turned that the rising of institute's control fan turns temperature；The return difference circuit includes electricity
R3~R6, triode Q2, electric capacity C1 are hindered, triode Q2 colelctor electrodes are connected to after wherein resistance R3, R4 series connection and temperature detection is driven
In dynamic circuit between triode Q1 base stage, three poles in power supply and temperature detection drive circuit are connected to after resistance R5, R6 series connection
Between pipe Q1 colelctor electrode, resistance R5 and resistance R6 connecting node connecting triode Q2 base stage, electric capacity C1 and resistance R3 is simultaneously
Connection.
Wherein, by setting resistance R1, R2 resistance, accurately control rising for fan and turn temperature and completely turn temperature.Electric capacity
C1 use is：In starting fan, full gear is rotated, when C1 is fully charged, and rotation speed of the fan returns normal.Prevent the small electricity of fan
When stream starts, the problem of possibly can not starting.
Operation principle：
As shown in figure 1, being raised with temperature, negative tempperature coefficient thermistor NTC resistances reduce, and temperature, which has risen to, turns temperature T_
During start, resistance R1 electric currents are flowed through more than during electric current, having electric current stream between triode Q1 base stage and emitter stage on resistance R2
Cross, triode Q1 conductings, resistance R6 has electric current to flow through, and turns on triode Q2.Return difference electric current passes through triode Q2 emitter stages, collection
Electrode, electric capacity C1, resistance R4 to triode Q1 base stage.Now fan completely turns to start.After electric capacity C1 is fully charged, return difference electric current
By triode Q2 emitter stage, colelctor electrode, resistance R3, resistance R4 to triode Q1 base stage.Return difference electric current now reduces,
Fan returns rated speed.When temperature, which continues to rise to, completely turns temperature T_full, fan completely turns.
R1, R2 resistances can determine that by formula (1) and formula (2).
When fan turns, below equation is met：
(12V-Vbe_sat)/(R_ntc_t_start+R1)=Vbe/R2 (1)
When fan completely turns, below equation is met：
(12V-Vbe_sat)/(R_ntc_t_full+R1)-Vbe/R2=I_full/ β (2)
Wherein：Vbe_sat:Q1 triodes Q1 BE poles saturation voltage drop.
R_ntc_t_start：Rise when turning temperature T_start, NTC resistances
R_ntc_t_full：When completely turning temperature T_full, NTC resistances
I_full:Fan completely turns electric current.
β:Triode Q1 Current amplifier digits.
Claims (3)
1. a kind of rotation speed of the fan temperature-control circuit, it is characterised in that：It is described including temperature detection drive circuit and return difference circuit
Return difference circuit provides driving current for temperature detection drive circuit, prevents temperature to be increased to fan and rise when turning temperature, fan is repeatedly
Start and stop, the temperature detection drive circuit include negative tempperature coefficient thermistor NTC, triode Q1, diode D1, resistance R1~
R2, fan FAN, wherein negative tempperature coefficient thermistor NTC and resistance R1, R2 be sequentially connected in series be followed by power supply and ground it
Between, resistance R1 and resistance R2 connecting node connecting triode Q1 base stage, triode Q1 grounded emitter, triode Q1's
Colelctor electrode connects one end of fan, and the other end connection power supply of fan, diode D1 is attempted by fan FAN two ends, and two poles
Pipe D1 negative pole connection power supply, resistance R1, R2 value is different, and it is different with temperature is completely turned that the rising of institute's control fan turns temperature.
2. rotation speed of the fan temperature-control circuit according to claim 1, it is characterised in that the return difference circuit includes resistance
R3~R6, triode Q2, triode in triode Q2 colelctor electrodes and temperature detection drive circuit is connected to after resistance R3, R4 series connection
Between Q1 base stage, resistance R5, R6 series connection after be connected to triode Q1 in power supply and temperature detection drive circuit colelctor electrode it
Between, resistance R5 and resistance R6 connecting node connecting triode Q2 base stage.
3. rotation speed of the fan temperature-control circuit according to claim 2, it is characterised in that the return difference circuit also includes electricity
Hold C1, electric capacity C1 is in parallel with resistance R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720151905.8U CN206468568U (en) | 2017-02-20 | 2017-02-20 | Rotation speed of the fan temperature-control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720151905.8U CN206468568U (en) | 2017-02-20 | 2017-02-20 | Rotation speed of the fan temperature-control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206468568U true CN206468568U (en) | 2017-09-05 |
Family
ID=59707071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720151905.8U Active CN206468568U (en) | 2017-02-20 | 2017-02-20 | Rotation speed of the fan temperature-control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206468568U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925231A (en) * | 2019-11-08 | 2020-03-27 | 漳州科华技术有限责任公司 | Fan failure over-temperature protection method, device and system |
| CN111641239A (en) * | 2020-06-16 | 2020-09-08 | 深圳英飞源技术有限公司 | Charging module over-temperature protection method and device, electronic equipment and storage medium |
| CN119277576A (en) * | 2024-11-27 | 2025-01-07 | 无锡泰博斯电气设备有限公司 | An electric heater control circuit and junction box with drying function |
-
2017
- 2017-02-20 CN CN201720151905.8U patent/CN206468568U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925231A (en) * | 2019-11-08 | 2020-03-27 | 漳州科华技术有限责任公司 | Fan failure over-temperature protection method, device and system |
| CN111641239A (en) * | 2020-06-16 | 2020-09-08 | 深圳英飞源技术有限公司 | Charging module over-temperature protection method and device, electronic equipment and storage medium |
| CN119277576A (en) * | 2024-11-27 | 2025-01-07 | 无锡泰博斯电气设备有限公司 | An electric heater control circuit and junction box with drying function |
| CN119277576B (en) * | 2024-11-27 | 2025-05-16 | 无锡泰博斯电气设备有限公司 | Electric heater control circuit with drying function and junction box |
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