CN107605778A - A kind of control circuit for being used for the fan for charger cooling - Google Patents
A kind of control circuit for being used for the fan for charger cooling Download PDFInfo
- Publication number
- CN107605778A CN107605778A CN201710608023.4A CN201710608023A CN107605778A CN 107605778 A CN107605778 A CN 107605778A CN 201710608023 A CN201710608023 A CN 201710608023A CN 107605778 A CN107605778 A CN 107605778A
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- CN
- China
- Prior art keywords
- control circuit
- fan
- thermistor
- pins
- charger
- Prior art date
- 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.)
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Abstract
The present invention provides a kind of control circuit for being used for the fan for charger cooling, and the control circuit includes：Thermistor, its resistance and the temperature of the radiator of the charger are inversely proportional；There is source crystal oscillator, its voltage pin couples with external voltage, and output pin exports the square wave of predeterminated frequency；Model PIC16F876A single-chip microcomputer, its clock pins couple with the output pin for having source crystal oscillator, and the voltage end of RA3 pins and the thermistor couples；Transistor, its base stage and the RC4 pins of the single-chip microcomputer couple, and the switch of colelctor electrode and fan couples, emitter grounding.
Description
Technical field
The present invention relates to charger field, more particularly to a kind of control circuit for being used for the fan for charger cooling.
Background technology
At present, air-cooled charger in charging due to that can generate heat, it is necessary to the special fan charger too high to temperature
Cooled.
Fan control is generally to open fan when charger has electric current output using single-chip microcomputer or DSP.In the mistake of charging
Cheng Zhong, only 70% needs to open fan in large current charge state.Also 30% time is in low current charge state,
Fan need not be opened.Fan life and energy waste thus be present.
The content of the invention
For the problem of when the radiator temperature of charger is not high, fan can also be run, the present invention proposes that one kind is used for
, can be according to the switch of the temperature controlled fan of radiator for the control circuit of the fan of charger cooling.
According to above-mentioned purpose, the present invention provides a kind of control circuit for being used for the fan for charger cooling, the control
Circuit includes：Thermistor, its resistance and the temperature of the radiator of the charger are inversely proportional；There is source crystal oscillator, its voltage pin
Coupled with external voltage, output pin exports the square wave of predeterminated frequency；Model PIC16F876A single-chip microcomputer, its clock pins
Coupled with the output pin for having source crystal oscillator, the voltage end of RA3 pins and the thermistor couples；Transistor, its base stage
Coupled with the RC4 pins of the single-chip microcomputer, the switch of colelctor electrode and fan couples, emitter grounding.
In one embodiment, the external voltage is 5V.
In one embodiment, the predeterminated frequency is 16MHz.
In one embodiment, the model MF52D103F3950 of the thermistor, by divider resistance with it is described external
Voltage couples.
In one embodiment, the resistance of the divider resistance is 10K ohms.
The present invention utilizes single-chip microcomputer, can be according to the switch of the temperature automatic control fan of radiator.
Brief description of the drawings
Fig. 1 shows a kind of circuit of the one side for the control circuit for being used for the fan for charger cooling of the present invention
Figure.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the present invention, below in conjunction with of the invention real
The accompanying drawing in example is applied, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described implementation
Example is only part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the common skill in this area
The every other embodiment that art personnel are obtained under the premise of creative work is not made, it should all belong to what the present invention protected
Scope.
Fig. 1 is refer to, Fig. 1 shows an a kind of side of the control circuit for being used for the fan for charger cooling of the present invention
The circuit diagram in face.
Wherein, thermistor TH402 resistance and the temperature of charger radiator are inversely proportional, that is to say, that charger dissipates
The temperature of hot device is higher, and resistance TH402 resistance is smaller.Thermistor TH402 model can select MF52D103F3950's
Model, naturally it is also possible to other thermistors for selecting the temperature of resistance and charger radiator to be inversely proportional.
Thermistor TH402 one end ground connection, the other end are couple to the electricity that external voltage is 5V by divider resistance R346
In pressure.
Thermistor TH402 voltage can be drawn from divider resistance R346 and thermistor TH402 connection end, by heat
Quick resistance TH402 voltage is coupled to model PIC16F876A single-chip microcomputer U15 RA3 pins.
There is the square wave of source crystal oscillator X1 output end OUT output predeterminated frequencies, external clock is provided for single-chip microcomputer U15.
Single-chip microcomputer U15 RC4 pins couple the switch of fan, specifically, the direct coupling of RC4 pins by transistor Q311
Transistor Q311 base stage is connect, base stage can be coupled by resistance R34 4.Transistor Q311 collector is directly coupled to fan
Switch.Transistor Q311 emitter grounding.
In order to provide suitable static parameter, foregoing earth point can also be replaced by -12V voltage.
When charger charges, radiator shell produces heat.This heat by the resistance of thermistor in the form of a voltage
Deliver to single-chip microcomputer U15 RA3 pins.When the temperature of charger is more than 50 DEG C, thermistor TH402 resistances diminish, single-chip microcomputer
U15 RA3 pin mouth voltages taper into, the single-chip microcomputer U15 RC4 pins output high level when voltage is less than 2.5V, now,
Transistor Q311 is turned on, and driving fan rotates.
When charger is in low current charge or floating charge, radiator temperature is less than 50 DEG C.At this moment the resistance of thermistor becomes
Greatly, single-chip microcomputer U15 RA3 pin mouth voltages become larger, when voltage is more than 2.5V.Single-chip microcomputer U15 RC4 pins output is low
Level, transistor Q311 cut-offs, now fan stalling, save the energy, increase fan life, reduce fan noise.
In addition, although the present specification is described in terms of embodiments, not each embodiment is only only comprising one
Vertical technical scheme, this narrating mode of specification only for clarity, those skilled in the art should using specification as
One entirety, the technical solutions in the various embodiments may also be suitably combined, formed it will be appreciated by those skilled in the art that its
His embodiment.
Claims (5)
1. a kind of control circuit for being used for the fan for charger cooling, it is characterised in that the control circuit includes：
Thermistor, its resistance and the temperature of the radiator of the charger are inversely proportional；
There is source crystal oscillator, its voltage pin couples with external voltage, and output pin exports the square wave of predeterminated frequency；
Model PIC16F876A single-chip microcomputer, its clock pins couple with the output pin for having a source crystal oscillator, RA3 pins with
The voltage end coupling of the thermistor；
Transistor, its base stage and the RC4 pins of the single-chip microcomputer couple, and the switch of colelctor electrode and fan couples, emitter grounding.
2. control circuit as claimed in claim 1, it is characterised in that the external voltage is 5V.
3. control circuit as claimed in claim 1, it is characterised in that the predeterminated frequency is 16MHz.
4. control circuit as claimed in claim 1, it is characterised in that the model MF52D103F3950 of the thermistor,
Coupled by divider resistance and the external voltage.
5. control circuit as claimed in claim 4, it is characterised in that the resistance of the divider resistance is 10K ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710608023.4A CN107605778A (en) | 2017-07-24 | 2017-07-24 | A kind of control circuit for being used for the fan for charger cooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710608023.4A CN107605778A (en) | 2017-07-24 | 2017-07-24 | A kind of control circuit for being used for the fan for charger cooling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107605778A true CN107605778A (en) | 2018-01-19 |
Family
ID=61059520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710608023.4A Pending CN107605778A (en) | 2017-07-24 | 2017-07-24 | A kind of control circuit for being used for the fan for charger cooling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107605778A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006196499A (en) * | 2005-01-11 | 2006-07-27 | Sony Corp | Cooling fan control circuit |
| CN203009348U (en) * | 2012-11-22 | 2013-06-19 | 成都卓程科技有限公司 | Fan speed control system based on thermistor design |
| CN103727047A (en) * | 2012-10-10 | 2014-04-16 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN104343714A (en) * | 2014-09-26 | 2015-02-11 | 迈普通信技术股份有限公司 | Circuit and device for controlling rotating speed of fan |
| CN205578327U (en) * | 2016-04-21 | 2016-09-14 | 无锡全裕电子科技有限公司 | Fan speed adjustment circuit of charger |
| CN205646887U (en) * | 2016-04-21 | 2016-10-12 | 无锡全裕电子科技有限公司 | A ambient temperature regulating circuit for charger |
-
2017
- 2017-07-24 CN CN201710608023.4A patent/CN107605778A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006196499A (en) * | 2005-01-11 | 2006-07-27 | Sony Corp | Cooling fan control circuit |
| CN103727047A (en) * | 2012-10-10 | 2014-04-16 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN203009348U (en) * | 2012-11-22 | 2013-06-19 | 成都卓程科技有限公司 | Fan speed control system based on thermistor design |
| CN104343714A (en) * | 2014-09-26 | 2015-02-11 | 迈普通信技术股份有限公司 | Circuit and device for controlling rotating speed of fan |
| CN205578327U (en) * | 2016-04-21 | 2016-09-14 | 无锡全裕电子科技有限公司 | Fan speed adjustment circuit of charger |
| CN205646887U (en) * | 2016-04-21 | 2016-10-12 | 无锡全裕电子科技有限公司 | A ambient temperature regulating circuit for charger |
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180119 |