CN108999809A - A kind of speed regulation circuit for fan - Google Patents
A kind of speed regulation circuit for fan Download PDFInfo
- Publication number
- CN108999809A CN108999809A CN201811155011.1A CN201811155011A CN108999809A CN 108999809 A CN108999809 A CN 108999809A CN 201811155011 A CN201811155011 A CN 201811155011A CN 108999809 A CN108999809 A CN 108999809A
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- fan
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- 230000033228 biological regulation Effects 0.000 title claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 35
- 239000004065 semiconductor Substances 0.000 claims description 16
- 206010037660 Pyrexia Diseases 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to stage lighting field of radiating, disclose a kind of speed regulation circuit for fan, including Switching Power Supply, compensation circuit, driving circuit, constant-voltage system, regulating system, the Switching Power Supply, compensation circuit, driving circuit, constant-voltage system, regulating system pass through circuit connection.The present invention can reduce component fever, control the fan kind of different size, do not limited by input voltage and fan work voltage, extend fan service life, while reducing noise.
Description
Technical field
The present invention relates to stage lighting field of radiating, and in particular to a kind of speed regulation circuit for fan.
Background technique
As the application of stage lamp is more frequent, the heat dissipation problem of stage lamp is also more prominent.Fan, as one kind
Effective heat dissipation tool, is widely used.
Earliest stage lamp is not no control circuit when using fan cooling, is transported always as long as an energization fan
Turn, it is short to will lead to fan life in this way.Only ON-OFF control circuit is later developed into, i.e. fan can only control two kinds of on or off
State, such case are not able to satisfy actual requirement still, cause noise big due to not can control rotation speed of the fan, influence using
Environment.Recent years, radiator fan have been gradually added speed-regulating function.
There are mainly three types of speed regulation circuit for fan used at present: the first is to add pwm signal to control by single triode, this
Kind circuit is without pressure-keeping functions, and input voltage is not above fan work voltage, voltage instability when no feedback signal will lead to speed regulation
Determine the problems such as error is big；Second of addition comparator and feedback signal add triode analog signal to control, and have obtained voltage surely
It is fixed, but due to analog signal control and linear constant pressure, this circuit efficiency is low and component fever is serious, and input voltage is more efficient
Rate is lower, and fever is more serious, therefore is limited to input voltage and fan work voltage when design；The third is that fan is needed to produce
Producer be added inside fan alignment circuit reserve PWM interface give MCU control, this kind of scheme fan itself without pressure-keeping functions so
Input voltage is not above fan work voltage, and the cost for increasing fan itself, is higher than fan if necessary to input
Voltage then needs that constant voltage circuit is added, and adds additional cost.
Summary of the invention
The present invention provides a kind of speed regulation circuit for fan, solves the problems, such as to be to provide a kind of high efficiency switch type constant pressure PWM wind
Fan speed regulation application scheme, can reduce component fever, the fan kind of different size be controlled, not by input voltage and fan work
Voltage limitation, extends fan service life, while reducing noise.
In order to achieve the above objectives, the present invention proposes a kind of speed regulation circuit for fan, comprising: Switching Power Supply, compensation circuit, driving
Circuit, constant-voltage system, regulating system, the Switching Power Supply, compensation circuit, driving circuit, constant-voltage system, regulating system electrically connect
It connects.
The Switching Power Supply, including DC-DC switching mode constant pressure chip, resistor R5, resistor R5 pass through circuit connection extremely
The FREQ foot of DC-DC switching mode constant pressure chip, for providing adjustable output voltage；
The compensation circuit, including capacitor C3 and resistor R4, capacitor C3 and resistor R4 are connected company by circuit
It is connected to the COMP foot of DC-DC switching mode constant pressure chip, keeps feedback voltage more stable for forming compensation circuit with FB foot；
The driving circuit, including capacitor C1, capacitor C1 pass through circuit connection to DC-DC switching mode constant pressure chip
BST foot provides high side driving voltage for the metal-oxide-semiconductor to chip interior；
The constant-voltage system, including diode, inductance, power capacitor CE2, resistor R1, resistor R3, diode,
Inductance, power capacitor CE2, resistor R1, resistor R3 by circuit connection to DC-DC switching mode constant pressure chip SW foot and
FB foot, for providing constant voltage for fan；
The regulating system, including metal-oxide-semiconductor, resistor R2, metal-oxide-semiconductor, resistor R2 are connected by circuit with constant-voltage system
It connects, for receiving pwm signal control voltage output.
Preferably, the Switching Power Supply further includes power capacitor CE1, capacitor C2, power capacitor CE1, capacitor
C2 is connected to input circuit by circuit in parallel, for filtering out the ripple and peak voltage of power-supply system, provides stabilization for chip
Input source.
The utility model has the advantages that Switching Power Supply can provide adjustable voltage for entire circuit, together in the circuit that the present invention designs
When improve efficiency, reduction is generated heat, compensation circuit improves sensitivity of control system, while improving degree of regulation, make feedback electricity
Press more stable, driving circuit provides high side driving voltage for the metal-oxide-semiconductor of chip interior, and constant-voltage system passes through other each sections
Cooperation provides constant voltage output for fan, improves stability, and regulating system adjusts feedback voltage by pwm signal, makes wind
Fan obtains different output voltage values, to adjust the revolving speed of fan.To obtain a kind of high efficiency switch type constant pressure PWM wind
Fan alignment circuit.The circuit can provide constant-voltage for fan, improve efficiency, and reduce component fever, speed electric essence
Quasi-steady, adjustable voltage range is big, is applicable in the fan of a variety of different sizes.And the circuit can support the PWM of 25KHz to adjust the speed letter
Number, under this frequency signal can inductance and capacitance component generate on fully erased circuit switch noise, fan when speed regulation
The high frequency noise of generation can also be removed.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of speed regulation circuit for fan proposed by the present invention.
Specific embodiment
As shown in Figure 1, a kind of speed regulation circuit for fan disclosed by the invention, is complete high efficiency switch type constant pressure PWM wind
Fan speed regulation application scheme.Including Switching Power Supply 21, compensation circuit 22, driving circuit 23, constant-voltage system 24, regulating system 25, institute
Switching Power Supply 21, compensation circuit 22, driving circuit 23, constant-voltage system 24, regulating system 25 is stated to be electrically connected.
Switching Power Supply 21 includes DC-DC switching mode constant pressure chip U1 and resistor R5, DC-DC switching mode constant pressure chip U1
EN foot 2 it is hanging, GND foot 5 is grounded, and VIN foot 7 accesses input voltage, then is connect by circuit with other components, for conduct
Adjustable out-put supply provides voltage for entire circuit, and DC-DC switching mode constant pressure chip U1 switching frequency is adjustable up to
2MHz, input voltage range DC3.8V~55V export adjustable voltage range DC0.8V~52V；Resistor R5 is connected to DC-
The FREQ foot 6 of DC switching mode constant pressure chip U1, other end ground connection, effect are the switches for adjusting DC-DC switching mode constant pressure chip U1
Frequency, to adjust output voltage size.Switching Power Supply 21 provides adjustable voltage for entire circuit.Switching mode constant pressure chip
Efficiency is higher, generates heat lower, and biggish adjustable output voltage range can make wind of the circuit suitable for different voltages specification
Fan type.
Compensation circuit 22 includes capacitor C3 and resistor R4, and capacitor C3 connects with resistor R4, is connected to DC-DC and opens
The COMP foot 3 of pass type constant pressure chip U1, other end ground connection function as internal error amplifier offset use, in control loop
Middle to amplify error signal, with DC-DC switching mode constant pressure chip U1 the composition compensation of FB foot 4 circuit, to improve control system
Sensitivity improves degree of regulation, keeps feedback voltage more stable.
Driving circuit 23 includes capacitor C1, and capacitor C1 is connected to the BST foot 8 of DC-DC switching mode constant pressure chip U1, is made
Use is to provide high side driving voltage to the metal-oxide-semiconductor inside DC-DC switching mode constant pressure chip U1 as charge pump charging capacitor.
Constant-voltage system 24 include diode D1, inductance L1, power capacitor CE2, resistor R1, resistor R3, inductance L1,
Power capacitor CE2 is connected to the SW foot 1 of DC-DC switching mode constant pressure chip U1, other end ground connection, and inductance L1 effect is storage
Energy inductance, power capacitor CE2 effect is output filter capacitor and voltage energy storage；It is permanent that diode D1 is connected to DC-DC switching mode
The SW foot 1 of chip U1 is pressed, other end ground connection, diode D1 effect is freewheeling diode；Resistor R1, resistor R3 are connected in series
To inductance L1 electric current outflow end, other end ground connection；Circuit is connected between self-resistance device R1, resistor R3 to DC-DC switching mode constant pressure
The FB foot 4 of chip U1；The composition of SW foot 1 of diode D1, inductance L1, power capacitor CE2 and DC-DC switching mode constant pressure chip U1
The reduction voltage circuit of switching regulator, output is with resistor R1 and resistor R3 composition partial pressure feed circuit through DC-DC switching mode constant pressure core
The switch time that the road FB of piece U1 is fed back into chip interior control SW foot 1 makes fan obtain perseverance to obtain constant voltage value
Fixed voltage input.
Regulating system 25 includes metal-oxide-semiconductor Q1 and resistor R2, and metal-oxide-semiconductor Q1 is in parallel with resistor R1, from single-chip microprocessor MCU
Pwm signal realizes that the output voltage for adjusting fan anode FAN+, i.e. PWM are just accounted for by the grid that resistor R2 enters metal-oxide-semiconductor Q1
Empty longer than the turn-on time of more high then metal-oxide-semiconductor Q1, the feedback voltage of the long then FB foot 4 of Q1 turn-on time rises fastly, when feedback electricity
Pressure then turns off SW foot 1 when reaching DC-DC switching mode constant pressure chip U1 internal comparator threshold values, at this time the high FB foot 4 of the positive duty ratio of PWM
The voltage rising fast time that then SW foot 1 is opened shortens, so the voltage of fan anode FAN+ is declined.The positive duty ratio of PWM is got over
The turn-on time of metal-oxide-semiconductor Q1 is shorter when low, and the feedback voltage of the short then FB foot 4 of Q1 turn-on time rises slow, i.e. time for opening of SW foot 1
Increase, so fan anode FAN+ output voltage is risen.Metal-oxide-semiconductor Q1 plays the key effect of control voltage output,
It can also be simply interpreted as the resistance value that metal-oxide-semiconductor Q1 changes resistor R1, that is, change the feedback voltage of FB foot 4, finally reach
Smart metastable speed-regulating function is arrived.
It further includes power capacitor CE1 and capacitor C2 that preferred embodiment, which is in Switching Power Supply 21, power capacitor CE1 and capacitor
C2 is in parallel, is connected to the VIN foot 7 of DC-DC switching mode constant pressure chip U1, and other end ground connection functions as the filter of input power
Wave capacitor filters out the ripple of power-supply system and peak voltage, obtains DC-DC switching mode constant pressure chip U1 more stable defeated
Enter source.
Illustrate technical solution of the present invention in order to clearer, it is proposed that a kind of specific embodiment are as follows: DC-DC switching mode is permanent
The VIN foot 7 of pressure chip U1 will provide the power input of 2V or more higher than fan work voltage, such as fan work voltage is 12V,
So VIN foot 7 just needs the voltage source of 14V or more to input highest no more than 55V, constant voltage output voltage value is then arranged,
Know that FB feedback 4 comparator reference value of foot is 0.8V, so according to formulaThat is resistor R1 resistance
Value=140K, resistor R3 resistance value=10K show that fan anode FAN+ voltage is 12V.To realize speed regulation with regard to needing to come from this time
The pwm signal of single-chip microprocessor MCU enters the grid of metal-oxide-semiconductor Q1 through resistor R2, and the turn-on time of metal-oxide-semiconductor Q1 and PWM are accounted at this time
Sky is than time synchronization, i.e., PWM duty cycle changes from 0-100%, 4 voltage of FB foot of DC-DC switching mode constant pressure chip U1 and then from
0.8V-0V variation, fan anode FAN+ voltage change also with the voltage of FB foot 4 from 12V-0.8V.It is different by adjusting PWM
Duty ratio can be obtained by the arbitrary point voltage between 0.8V-12V, to realize the speed-regulating function of fan.
In conjunction with attached drawing, the embodiments of the present invention are described in detail above, but invention is not limited to described embodiment party
Formula.For a person skilled in the art, do not depart from the principle of the invention and spirit in the case where, to these embodiments into
The a variety of change, modification, replacement and modification of row, still fall in protection scope of the present invention.
Claims (2)
1. a kind of speed regulation circuit for fan, it is characterised in that: including Switching Power Supply, compensation circuit, driving circuit, constant-voltage system, tune
Section system, the Switching Power Supply, compensation circuit, driving circuit, constant-voltage system, regulating system are electrically connected；
The Switching Power Supply, including DC-DC switching mode constant pressure chip, resistor R5, the resistor R5 are connected to the DC-DC
The FREQ foot of switching mode constant pressure chip；
The compensation circuit, including capacitor C3 and resistor R4, the capacitor C3 are connected to the resistor R4
The COMP foot of the DC-DC switching mode constant pressure chip；
The driving circuit, including capacitor C1, the capacitor C1 are connected to the BST of the DC-DC switching mode constant pressure chip
Foot；
The constant-voltage system, including diode, inductance, power capacitor CE2, resistor R1, resistor R3, the diode,
Inductance, power capacitor CE2, resistor R1, resistor R3 are connected to the SW foot and FB of the DC-DC switching mode constant pressure chip
Foot；
The regulating system, including metal-oxide-semiconductor, resistor R2, the metal-oxide-semiconductor, the resistor R2 are connected with the constant-voltage system
It connects.
2. speed regulation circuit for fan according to claim 1, it is characterised in that: the Switching Power Supply further includes power capacitor
CE1, capacitor C2, the power capacitor CE1 and the capacitor C2 are connected in parallel to input circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811155011.1A CN108999809A (en) | 2018-09-30 | 2018-09-30 | A kind of speed regulation circuit for fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811155011.1A CN108999809A (en) | 2018-09-30 | 2018-09-30 | A kind of speed regulation circuit for fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108999809A true CN108999809A (en) | 2018-12-14 |
Family
ID=64589731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811155011.1A Withdrawn CN108999809A (en) | 2018-09-30 | 2018-09-30 | A kind of speed regulation circuit for fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108999809A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116696828A (en) * | 2023-07-26 | 2023-09-05 | 深圳硅山技术有限公司 | A fan speed regulating circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7479753B1 (en) * | 2004-02-24 | 2009-01-20 | Nvidia Corporation | Fan speed controller |
| CN101963150A (en) * | 2009-07-21 | 2011-02-02 | 鸿富锦精密工业（深圳）有限公司 | Fan type detection and speed regulation system |
| CN202628572U (en) * | 2012-02-29 | 2012-12-26 | 浙江师范大学 | Elevator room fan system |
| CN103727047A (en) * | 2012-10-10 | 2014-04-16 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN206329529U (en) * | 2016-12-30 | 2017-07-14 | 深圳市东微智能科技有限公司 | A kind of stepless time adjustment system for adjusting fan voltage |
| CN208793296U (en) * | 2018-09-30 | 2019-04-26 | 广州鹏林照明灯具有限公司 | A kind of speed regulation circuit for fan |
-
2018
- 2018-09-30 CN CN201811155011.1A patent/CN108999809A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7479753B1 (en) * | 2004-02-24 | 2009-01-20 | Nvidia Corporation | Fan speed controller |
| CN101963150A (en) * | 2009-07-21 | 2011-02-02 | 鸿富锦精密工业（深圳）有限公司 | Fan type detection and speed regulation system |
| CN202628572U (en) * | 2012-02-29 | 2012-12-26 | 浙江师范大学 | Elevator room fan system |
| CN103727047A (en) * | 2012-10-10 | 2014-04-16 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN206329529U (en) * | 2016-12-30 | 2017-07-14 | 深圳市东微智能科技有限公司 | A kind of stepless time adjustment system for adjusting fan voltage |
| CN208793296U (en) * | 2018-09-30 | 2019-04-26 | 广州鹏林照明灯具有限公司 | A kind of speed regulation circuit for fan |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116696828A (en) * | 2023-07-26 | 2023-09-05 | 深圳硅山技术有限公司 | A fan speed regulating circuit |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181214 |