CN209180092U - A kind of temperature control adjusts the automatic control circuit of rotation speed of the fan - Google Patents
A kind of temperature control adjusts the automatic control circuit of rotation speed of the fan Download PDFInfo
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- CN209180092U CN209180092U CN201821935112.6U CN201821935112U CN209180092U CN 209180092 U CN209180092 U CN 209180092U CN 201821935112 U CN201821935112 U CN 201821935112U CN 209180092 U CN209180092 U CN 209180092U
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Abstract
The utility model relates to the automatic control circuits that a kind of temperature control adjusts rotation speed of the fan, including current sampling circuit, comparator and switching tube, the output end of the current sampling circuit is connected with the inverting input terminal of comparator, the normal phase input end of comparator is connected with the first reference voltage, the control terminal of the output end connection switch pipe of comparator, the switching tube is serially connected in fan circuit, thermistor is additionally provided in the fan circuit, the thermistor and first resistor constitute bleeder circuit, the input terminal of the bleeder circuit is the feeder ear of fan circuit, output end is connected by a Voltage stabilizing module with the switching tube.The utility model is realized using building for pure hardware circuit according to temperature difference automatic adjustment rotation speed of the fan.
Description
Technical field
The utility model relates to a kind of fan control circuitries, and the automatic control of rotation speed of the fan is adjusted more particularly to a kind of temperature control
Circuit processed.
Background technique
Although traditional fan radiating system can play the heat spreading function to other heating devices, machine just starts temperature
When degree is not also very high, fan will be started to work with maximum speed.Fan can generate very big noise in most high speed rotation, and
Temperature be not very higher position at full speed rotation also can power consumption, waste of energy.And traditional speed adjustable fan is also to need manpower is dynamic to go
It adjusts, it is not very convenient, and each gear wind speed differs greatly, and is difficult to meet all kinds of demands.In the fan of another quasi-tradition
Portion is built by integrated circuit, and there are also a special speed regulation lines other than two power supply lines, although tune can also be played
Speed effect, but integrated circuit higher cost.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of temperature control adjust rotation speed of the fan automatic control circuit,
Rotation speed of the fan can be automatically adjusted according to temperature difference.
The technical scheme adopted by the utility model to solve the technical problem is as follows: providing a kind of temperature control adjusts rotation speed of the fan
Automatic control circuit, including current sampling circuit, comparator and switching tube, the output end and comparator of the current sampling circuit
Inverting input terminal be connected, the normal phase input end of comparator is connected with the first reference voltage, the output end connection switch of comparator
The control terminal of pipe, the switching tube are serially connected in fan circuit, and thermistor, the temperature-sensitive are additionally provided in the fan circuit
Resistance and first resistor constitute bleeder circuit, and the input terminal of the bleeder circuit is the feeder ear of fan circuit, and output end passes through
One Voltage stabilizing module is connected with the switching tube.
The output end of the bleeder circuit is connected by plus and minus calculation amplifier with Voltage stabilizing module, the plus and minus calculation amplification
The normal phase input end of device is connected with the output end of bleeder circuit, and inverting input terminal connects the second reference voltage and plus and minus calculation is put
The output end minimum value of big device is 0.
The output end of the plus and minus calculation amplifier is connected by a current-limiting resistance with the end GND of Voltage stabilizing module.
The end GND of the Voltage stabilizing module also passes through a voltage-stabiliser tube ground connection.
The thermistor is PTC resistor.
Beneficial effect
Due to the adoption of the above technical solution, the utility model compared with prior art, has the following advantages that and accumulates
Pole effect: the pure hardware of the circuit of the utility model is built, more accurate and simple, convenient to carry out, is controlled compared to software
System also can be more stable and convenient for safeguarding.The utility model can reduce turning for fan when fan does not need high revolving speed
Speed can mitigate the noise pollution of fan, making an uproar when by fan work by the adjusting of revolving speed to reduce noise well
Sound shadow, which is rung, to be reduced.The utility model reduces the revolving speed of fan when fan does not need to rotate at full speed, has both played fan sheet
The effect of body reduces unnecessary energy consumption again.The utility model, which realizes, follows temperature to carry out linear regulation rotation speed of the fan,
It can make the more smooth of the rotation speed change of fan, be not in that gear is poor, meet various demands.The utility model may be implemented
People are freed from manually adjusting in fan dynamics, fan are enable to be come from according to the variation of temperature by the automation of fan
It is dynamic to adjust wind-force size.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The present invention will be further illustrated below in conjunction with specific embodiments.It should be understood that these embodiments are merely to illustrate this
Utility model rather than limitation the scope of the utility model.In addition, it should also be understood that, in the content for having read the utility model instruction
Later, those skilled in the art can make various changes or modifications the utility model, and such equivalent forms equally fall within this Shen
It please the appended claims limited range.
The embodiments of the present invention is related to a kind of automatic control circuit of temperature control adjusting rotation speed of the fan, as shown in Figure 1,
Including current sampling circuit, comparator and switching tube, the output end of the current sampling circuit and the inverting input terminal of comparator
It is connected, the normal phase input end of comparator is connected with the first reference voltage, the control terminal of the output end connection switch pipe of comparator, institute
Switching tube is stated to be serially connected in fan circuit.
Fixed value is set in one end of comparator, current sampling signal is added in the other end, is less than setting in sample rate current
When fixed value (i.e. the first reference voltage), comparator exports a high level, the PMOS switch pipe shutdown connected below, control
Fan circuit open circuit, fan end are given less than voltage value, and here it is do not allow fan work at light load；When the current signal sampled is big
When fixed value, machine reaches heavy duty, and comparator exports a low level at this time, the PMOS switch pipe connection connected below, control
The fan circuit of system is connected to, and fan is started to work.
Rotation speed of the fan is automatically adjusted according to temperature on the basis of machine when overloaded namely start to work by fan, it is main
If changing the voltage at fan both ends to reach the control to rotation speed of the fan.By thermistor being arranged in fan circuit come real
Existing above-mentioned function.Wherein, thermistor uses PTC resistor, constitutes bleeder circuit with first resistor R1, the bleeder circuit
Input terminal is the feeder ear VCC of fan circuit, and output end is connected by a Voltage stabilizing module LM7805 with PMOS switch pipe.In order to
Ensure output voltage and the linear proportional relationship of PTC resistor, it can be in the output end and Voltage stabilizing module LM7805 of bleeder circuit
Between increase a plus and minus calculation amplifier, the output end phase of the normal phase input end and bleeder circuit of the plus and minus calculation amplifier
Even, the second reference voltage of inverting input terminal connection makes the output end minimum value of plus and minus calculation amplifier be 0, and output end connection is steady
The end GND of die block LM7805.The voltage value of plus and minus calculation amplifier output is positive the sum after reverse side voltage amplification, namely
It is that output voltage is linear proportional relationship with PTC resistor.Reverse phase, which terminates the second reference voltage, can guarantee that plus and minus calculation amplifies
The voltage of device output can change since 0V.Temperature increases, and the resistance value of PTC resistor becomes larger, and plus and minus calculation amplifier is just
Phase terminal voltage becomes larger, and reverse phase terminal voltage value is constant, and the voltage of plus and minus calculation amplifier output will be got higher.
In present embodiment, the output end of plus and minus calculation amplifier passes through the GND of a current-limiting resistance R6 and Voltage stabilizing module
End is connected.The end GND of the Voltage stabilizing module also passes through a voltage-stabiliser tube ZD1 ground connection.The output voltage of plus and minus calculation amplifier passes through
It crosses a current-limiting resistance R6 and then is connected to the end GND of LM7805 Voltage stabilizing module, and terminate a voltage-stabiliser tube ZD1 in GND, so that
The maximum value of the output voltage of plus and minus calculation amplifier is exactly the maximum stable voltage of voltage-stabiliser tube, so ZD1 pairs of this voltage-stabiliser tube
Fan plays the role of limitation protection, limits the ceiling voltage at fan both ends.The output voltage of LM7805 Voltage stabilizing module is
The sum of reference output voltage+5V and plus and minus calculation amplifier output voltage of LM7805, that is to say the defeated of LM7805 Voltage stabilizing module
Voltage and the proportional example variation relation of PTC resistor out, the base that in addition ceiling voltage of LM7805 Voltage stabilizing module output is LM7805
Quasi- output voltage+5 adds the pressure stabilizing value of this voltage-stabiliser tube ZD1, that is, normal working voltage of the fan in maximum speed, protects
The output voltage of card LM7805 does not exceed the normal working voltage of fan, is further ensured that and is not allowing fan two when the temperature is excessively high
End voltage increases always, avoids damaging fan because of overtension.
The difference of fan both end voltage can make fan generate different revolving speeds, so being exported according to plus and minus calculation amplifier
Voltage it is different, the voltage at fan both ends changes in a certain range, the voltage change of plus and minus calculation amplifier output be because
The input resistance of plus and minus calculation amplifier is changed, and the variation of this input resistance is the difference because of temperature and is led to
The variation for the resistance value for crossing PTC resistor to generate, has then just reached and has varied with temperature, the effect of fan automatic speed regulation.And because
Resistance value for thermistor is linear change with temperature change, causes the voltage of plus and minus calculation amplifier out also line
Property variation, output end also has a linear voltage change, and fan end receives the voltage change of a linear smoothing, wind
The revolving speed of fan also, without being mutated, can more be mitigated with voltage changing bit by bit.
Claims (5)
1. a kind of temperature control adjusts the automatic control circuit of rotation speed of the fan, including current sampling circuit, comparator and switching tube, described
The output end of current sampling circuit is connected with the inverting input terminal of comparator, the normal phase input end of comparator and the first reference voltage
It is connected, the control terminal of the output end connection switch pipe of comparator, the switching tube is serially connected in fan circuit, which is characterized in that
Thermistor is additionally provided in the fan circuit, the thermistor and first resistor constitute bleeder circuit, the partial pressure electricity
The input terminal on road is the feeder ear of fan circuit, and output end is connected by a Voltage stabilizing module with the switching tube.
2. the automatic control circuit that temperature control according to claim 1 adjusts rotation speed of the fan, which is characterized in that the partial pressure electricity
The output end on road is connected by plus and minus calculation amplifier with Voltage stabilizing module, the normal phase input end of the plus and minus calculation amplifier and is divided
The output end of volt circuit is connected, and inverting input terminal connects the output end minimum value that the second reference voltage makes plus and minus calculation amplifier
It is 0.
3. the automatic control circuit that temperature control according to claim 2 adjusts rotation speed of the fan, which is characterized in that the plus-minus fortune
The output end for calculating amplifier is connected by a current-limiting resistance with the end GND of Voltage stabilizing module.
4. the automatic control circuit that temperature control according to claim 3 adjusts rotation speed of the fan, which is characterized in that the pressure stabilizing mould
The end GND of block also passes through a voltage-stabiliser tube ground connection.
5. the automatic control circuit that temperature control according to claim 1 adjusts rotation speed of the fan, which is characterized in that the temperature-sensitive electricity
Resistance is PTC resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821935112.6U CN209180092U (en) | 2018-11-22 | 2018-11-22 | A kind of temperature control adjusts the automatic control circuit of rotation speed of the fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821935112.6U CN209180092U (en) | 2018-11-22 | 2018-11-22 | A kind of temperature control adjusts the automatic control circuit of rotation speed of the fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209180092U true CN209180092U (en) | 2019-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821935112.6U Active CN209180092U (en) | 2018-11-22 | 2018-11-22 | A kind of temperature control adjusts the automatic control circuit of rotation speed of the fan |
Country Status (1)
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| CN (1) | CN209180092U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985428A (en) * | 2019-12-14 | 2020-04-10 | 珠海格力电器股份有限公司 | Cooling fan drive circuit and cooking utensil |
-
2018
- 2018-11-22 CN CN201821935112.6U patent/CN209180092U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985428A (en) * | 2019-12-14 | 2020-04-10 | 珠海格力电器股份有限公司 | Cooling fan drive circuit and cooking utensil |
| CN110985428B (en) * | 2019-12-14 | 2020-12-01 | 珠海格力电器股份有限公司 | Cooling fan drive circuit and cooking utensil |
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