CN205578327U - Fan speed adjustment circuit of charger - Google Patents
Fan speed adjustment circuit of charger Download PDFInfo
- Publication number
- CN205578327U CN205578327U CN201620341821.6U CN201620341821U CN205578327U CN 205578327 U CN205578327 U CN 205578327U CN 201620341821 U CN201620341821 U CN 201620341821U CN 205578327 U CN205578327 U CN 205578327U
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- resistance
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- charger
- fan
- single chip
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Abstract
The utility model discloses a fan speed adjustment circuit of charger, include the charger circuit who is connected with AC input, does charger circuit's output pass through DC the DC circuit is connected with the fan, DC the positive output of DC circuit holds and loops through resistance R1, resistance R2 ground connection, resistance R1 and resistance R2's well node with DC the signal feedback end FB of DC circuit connects, still include triode Q, triode Q's collecting electrode is connected to through resistance R3 resistance R1 and resistance R2's well node, triode Q's the base and the PWM connected signal of single chip circuit, triode Q's emitter ground, the AD sampling end and the thermistor RT of single chip circuit are connected. The utility model discloses the fan that can make the charger always keeps at optimum rotational speed state, the improvement of maximize the utilization ratio of fan, reduced the consumption of charger to the life -span of fan has been improved.
Description
Technical field
This utility model relates to the speed regulation circuit for fan of a kind of charger.
Background technology
Along with the increasing of charger power, the limitation that natural heat dissipation volume is heavy, increasing charger is adopted
Heat extraction is carried out with fan.Air-cooled radiating mode is compared to natural heat dissipation, can be made less by the volume of charger,
Reduce raw-material temperature requirement, improve the heat dispersion of charger.But, the operation principle of fan is
Electric energy is converted to magnetic energy, and magnetic energy is converted to mechanical energy, and changes mechanical energy is the product of wind energy, the use longevity of fan
Life is the load with fan, and the use time is inversely proportional to.The fan of conventional charger does not do and controls or controlling party
Formula is only work and does not works, and need to need not fan regardless of the state that charger is current and open, all without exception by fan
It is opened into maximum quantity of wind, causes fan and done a lot of idle work, in the service life of deep fades fan, more come
The most chargers are scrapped because of the termination of fan life.
Utility model content
This utility model purpose is the fan speed-regulating electricity that the defect existed for prior art provides a kind of charger
Road.
This utility model for achieving the above object, adopts the following technical scheme that the fan speed-regulating electricity of a kind of charger
Road, including the charger circuit being connected with ac input end, the outfan of described charger circuit passes through DC-DC
Circuit is connected with fan；The cathode output end of described DC-DC circuit passes sequentially through resistance R1, resistance R2 ground connection,
The interior joint of described resistance R1 and resistance R2 is connected with the signal feedback end FB of described DC-DC circuit；Also wrap
Including audion Q, the colelctor electrode of described audion Q is connected to described resistance R1 and resistance R2 by resistance R3
Interior joint, the base stage of described audion Q is connected with the pwm signal end of single chip circuit, described audion Q
Grounded emitter；The AD sampling end of described single chip circuit is connected with critesistor RT.
The beneficial effects of the utility model: it is most suitable that this utility model can make the fan of charger always remain at
Rotary regimes, the maximized utilization rate that improve fan, reduce the power consumption of charger, and improve fan
Life-span.
Accompanying drawing explanation
Fig. 1 is circuit theory schematic diagram of the present utility model.
Detailed description of the invention
Shown in Fig. 1, relate to the speed regulation circuit for fan of a kind of charger, including the charging being connected with ac input end
Device circuit 1, the outfan of described charger circuit 1 is connected with fan 3 by DC-DC circuit 2；Described DC-DC
The cathode output end of circuit 2 passes sequentially through resistance R1, resistance R2 ground connection, described resistance R1's and resistance R2
Interior joint is connected with the signal feedback end FB of described DC-DC circuit 2；Also include audion Q, described three poles
The colelctor electrode of pipe Q is connected to described resistance R1 and the interior joint of resistance R2, described audion by resistance R3
The base stage of Q is connected with the pwm signal end of single chip circuit 4, the grounded emitter of described audion Q；Described
The AD sampling end of single chip circuit 4 is connected with critesistor RT.
Its operation principle is: when the temperature of charger is more than 35 degrees Celsius, and critesistor RT resistance diminishes,
Single chip circuit 4 collects temperature value, the positive pulsewidth of the pwm signal output 50% of single chip circuit 4, controls
Audion Q enters magnifying state, changes the voltage sample circuit of resistance R1, resistance R2, resistance R3 composition
Sampling ratio, and the voltage sampling signal of this change is fed back to the signal feedback end FB of DC-DC circuit 2,
DC-DC circuit 2 exports 10V.
When the constant temperature of charger raises, and the resistance of critesistor RT persistently diminishes, and single chip circuit 4 is adopted
Collection is to temperature value, and the pwm signal of single chip circuit 4 exports positive pulsewidth and persistently becomes big.Change resistance R1, electricity
The sampling ratio of the voltage sample circuit of resistance R2, resistance R3 composition, and by the voltage sampling signal of this change
Feed back to the signal feedback end FB of DC-DC circuit 2.DC-DC circuit output is made to uprise, the rotating speed of fan 3
Accelerating, air quantity increases.
When the constant temperature of charger reduces, and the resistance of critesistor RT persistently becomes big, and single chip circuit 4 is adopted
Collection is to temperature value, and the pwm signal of single chip circuit 4 exports positive pulsewidth and persistently diminishes.Change resistance R1, electricity
The sampling ratio of the voltage sample circuit of resistance R2, resistance R3 composition, and by the voltage sampling signal of this change
Feed back to the signal feedback end FB of DC-DC circuit 2.DC-DC circuit 2 is made to export step-down, turning of fan 3
Speed is slack-off, and air quantity reduces.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this
Within the spirit of utility model and principle, any modification, equivalent substitution and improvement etc. made, should be included in
Within protection domain of the present utility model.
Claims (1)
1. the speed regulation circuit for fan of a charger, it is characterised in that include that be connected with ac input end fills
Appliance circuit, the outfan of described charger circuit is connected with fan by DC-DC circuit；Described DC-DC circuit
Cathode output end pass sequentially through resistance R1, resistance R2 ground connection, described resistance R1 and the interior joint of resistance R2 and institute
The signal feedback end FB stating DC-DC circuit connects；Also include that audion Q, the colelctor electrode of described audion Q pass through
Resistance R3 is connected to described resistance R1 and the interior joint of resistance R2, the base stage of described audion Q and single chip circuit
Pwm signal end connect, the grounded emitter of described audion Q；The AD sampling end of described single chip circuit and heat
Quick resistance RT connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620341821.6U CN205578327U (en) | 2016-04-21 | 2016-04-21 | Fan speed adjustment circuit of charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620341821.6U CN205578327U (en) | 2016-04-21 | 2016-04-21 | Fan speed adjustment circuit of charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205578327U true CN205578327U (en) | 2016-09-14 |
Family
ID=56860504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620341821.6U Active CN205578327U (en) | 2016-04-21 | 2016-04-21 | Fan speed adjustment circuit of charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205578327U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107605778A (en) * | 2017-07-24 | 2018-01-19 | 张家港市华为电子有限公司 | A kind of control circuit for being used for the fan for charger cooling |
-
2016
- 2016-04-21 CN CN201620341821.6U patent/CN205578327U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107605778A (en) * | 2017-07-24 | 2018-01-19 | 张家港市华为电子有限公司 | A kind of control circuit for being used for the fan for charger cooling |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |