CN105257579A - Speed governing draught fan - Google Patents
Speed governing draught fan Download PDFInfo
- Publication number
- CN105257579A CN105257579A CN201510753889.5A CN201510753889A CN105257579A CN 105257579 A CN105257579 A CN 105257579A CN 201510753889 A CN201510753889 A CN 201510753889A CN 105257579 A CN105257579 A CN 105257579A
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- fan
- amplifier
- temperature collecting
- temperature
- collecting cell
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- Control Of Positive-Displacement Air Blowers (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The invention relates to a speed governing draught fan. The speed governing draught fan comprises a single-chip microcomputer control unit and a temperature collecting unit. The temperature collecting unit is connected with a draught fan speed adjusting unit. The input of the draught fan speed adjusting unit is connected with the temperature collecting unit. The output of the draught fan speed adjusting unit is connected with the positive terminal and the negative terminal of a draught fan power source so that an output signal of the temperature collecting unit can be loaded on the draught fan power source to control the voltage between the positive terminal and the negative terminal of the draught fan power source. According to the speed governing draught fan, the problem that some heating devices exceed the standard when a colleting point does not reach an over-temperature protection point is solved, and control is simple, convenient and reliable.
Description
Technical field
The present invention relates to a kind of blower fan, carry out speed governing according to temperature.
Background technique
Along with power electronic power device is to the development in high power density direction, the heat in element unit volume is corresponding increase also.In the equipment such as high-power high-frequency communication power supply, the electric energy loss of device for power switching is especially outstanding, this part consumed power can change heat into makes the heating of power device tube core, junction temperature rising, if can not in time, effectively by this thermal release, the service behaviour of device will be had influence on, thus reduce the reliability of system works, even damage device.Therefore thermal design has become key one ring of power electronic product design.Can the effect of thermal design be also directly connected to power electronic equipment and normally, stably work for a long time.
Blower fan is cooling conventional in high frequency switch power, venting gas appliance, if blower fan breaks down and does not have Timeliness coverage in device normal course of operation, device will be not enough due to heat dissipation potential, then power loss will cause device inside chip active region temperature to rise and junction temperature rising.If junction temperature exceedes the maximum temperature of permission, chip performance can be caused to reduce, reliability reduces, cannot safe and reliable work, can fire hazard or other major accidents time serious, and the lighter causes device to be shut down, and severe one can cause device to paralyse.
Under blower fan stall or stop state, device continues maintenance work, and the temperature of the heater members of device can slowly rise, and occurs overheat protector under good situations, then switch back and forth between device busy state and halted state, this situation can cause reduce device lifetime; If under rigor condition, the temperature of temperature acquisition point does not also reach protection point, and generate heat in device serious power device or perceptual device will cause damaging because temperature raises too fast, may cause the fire of device time serious.
Be operated in the situations such as input low-pressure high-power, output big current, output full power load, output high-voltage great-current when device under, the Partial Power device of device inside can send a large amount of heats, if slowly regulate the rotating speed of blower fan according to the temperature of temperature acquisition point, device temperature operating range may be caused wider, cause reduce the working life of device.
Summary of the invention
The object of this invention is to provide a kind of adjustable speed fan, when to be less than overheat protector point in collection point in order to solve, the problem that some heater members have exceeded standard.
For achieving the above object, the solution of the present invention comprises:
A kind of adjustable speed fan, comprise single chip control unit and temperature collecting cell, temperature collecting cell connecting fan speed adjustment unit, described fan speed regulation unit input connects temperature collecting cell, export the positive and negative terminals of connecting fan power supply, temperature collecting cell output signal is carried on fan power, with the voltage between the positive and negative terminals controlling fan power.
The current sense terminal of described adjustable speed fan connects a blower fan stall detection unit, and this blower fan stall detection unit sends into single chip control unit after being used for carrying out level conversion to current sense terminal output signal.
Described temperature collecting cell also connects an over-temperature protection unit, and the signal that temperature collecting cell exports sends into single chip control unit after the comparison and level conversion of over-temperature protection unit.
Described single chip control unit control connection air-blower control unit, this air-blower control unit comprises an electronic switch (Q1), and this electronic switch (Q1) is connected between power positive end and fan power anode.
Described temperature collecting cell comprises an operational amplifier (U2B), fan speed regulation unit comprises a dual-stage amplifier, operational amplifier (U2B) output terminal is connected to the base stage of first order amplifier (V2), the emitter of first order amplifier (V2) is connected with the base stage of second level amplifier (V3), the collector electrode of first order amplifier (V2) is connected with the collector electrode of second level amplifier (V3), and connect power positive end (VCC), the emitter connecting fan power positive end of second level amplifier (V3).
Operational amplifier (U2B) output terminal is connected with ground connection voltage-stabiliser tube.
In the present invention, the temperature of temperature collecting cell extraction apparatus, then be corresponding magnitude of voltage by temperature transition, then deliver to the fan speed regulation unit of rear end, carry out the voltage of linear regulable control rotation speed of fan, and then regulate the rotating speed of blower fan.Certainly, also or several rotation speed of fan point can be set according to temperature voltage value, reach a value, control voltage change one value of rotation speed of fan, realize the object that rotation speed of fan gear regulates.
Further, realize blower fan reach maximum speed by air-blower control unit, solve in the situations such as input low-pressure high-power, output big current, output full power load, output high-voltage great-current, blower fan varies with temperature speed governing problem slowly.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of the embodiment of the present invention;
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fan speed regulation controlling method of the present invention comprises following link: 1) device normally works on power, the temperature of temperature collecting cell extraction apparatus, again by magnitude of voltage that temperature transition is corresponding, then the fan speed regulation unit of rear end is delivered to, carry out the voltage of linear regulable control rotation speed of fan, and then regulate the rotating speed of blower fan.2) if when temperature voltage value exceedes reference point, over-temperature protection unit exports trouble signal, and this Output rusults is sent to single chip control unit, and the work of the arresting stop that then sends instructions down, until Failure elimination returns to working state again.3) if the electric current that blower fan stall detection unit detects is greater than setting reference voltage value, export trouble signal, and this Output rusults is sent to single chip control unit, the work of the arresting stop that then sends instructions down, until Failure elimination returns to working state again.4) if under single chip control unit detects that device is in input low-voltage high-power, exports big current, exports the state such as full power and output HIGH voltage big current, by under send instructions and control air-blower control unit, realize blower fan and reach maximum speed.
Below in conjunction with Fig. 2, the present invention is further elaborated.
Temperature collecting cell: power supply VCC is connected by 2 pin of resistance R1 and J1,1 pin of J1 is connected with electric capacity C1 with resistance R2, and J1 is the temperature value of device sampled point, and the element according to using finally is converted to corresponding resistance value, temperature is different, the resistance value difference that J1 is corresponding; Resistance R2 is divider resistance, and electric capacity C1 strobes, simultaneously their two the other end ground connection be connected with J1.1 pin of J1 is connected with in-phase input end 5 pin of amplifier U2B by resistance R3 simultaneously, the inverting input of amplifier U2B is by resistance R4 ground connection, resistance R5 is amplifier proportional component, and output 7 pin of amplifier U2B is then the point that device sampled point temperature transition is magnitude of voltage, is set to A point.
Fan speed regulation unit: A point is connected with fan speed regulation unit by resistance R15, the other end of R15 is connected with the negative electrode of Z1, the anode of Z1 is connected with the negative electrode of Z2, the minus earth of Z2, Z1 and Z2 is voltage-stabiliser tube, amplitude limit is carried out to the voltage entering triode V2 base stage, the emitter of V2 is connected with the base stage of V3, the collector electrode of V2 is connected with the collector electrode of V3, and be connected with power supply VCC by resistance R16, the emitter of V3 and one end of electrochemical capacitor E1, the negative electrode of diode D1 is connected with 1 pin of J2, 2 pin of J2 and the other end of E1, the anode of diode is connected, herein 1 pin of J2 be fan power just, 2 pin are the negative of fan power, 3 pin are blower fan current detecting pin.The magnitude of voltage of A point is different, and the base current flowing through R15 is different, then the collector current flowing through R16 is different, so 1 pin of J2 is different with the voltage of 2 pin, then and the Control of Voltage voltage of blower fan of A point, and then control blower fan rotating speed.
With in upper type, V2 and V3 is linear unit, thus achieves the linear change of voltage between fan power end.As other mode of executions, also can adopt other linear units to realize.
Fan speed regulation unit will carry out the voltage of linear regulable control rotation speed of fan according to temperature voltage value, and then regulates the rotating speed of blower fan, makes, along with temperature voltage value raises, to realize the object that rotation speed of fan improves; As other mode of executions, also can design corresponding circuit realiration and several rotation speed of fan point is set according to temperature voltage value, reach a value, control voltage change one value of rotation speed of fan, realize the object that rotation speed of fan gear regulates, such as adopt multiple comparator to compare to realize temperature value, realize rotating speed gear with voltage gear circuit.
Over-temperature protection unit: A point is connected with over-temperature protection unit by resistance R6, A point voltage, by R6 and R7 dividing potential drop, then enters in-phase input end 3 pin of amplifier U2A by resistance R8; Resistance R10 and R9 carries out dividing potential drop to power supply VCC, and this partial pressure value, as the reference value of overheat protector point, then enters inverting input 2 pin of amplifier U2A; The output pin 1 of amplifier U2A as comparative result, i.e. OT.During normal work, OT is high voltage, and through the dividing potential drop of resistance R13 and resistance R12, electric capacity C2 filtering, power tube V1 conducting, then OT_FAULT is low level zero.When excess temperature, OT is low level, power tube V1 not conducting, and OT_FAULT is connected with power supply VCC1 by resistance R14, is high level VCC1.
3 pin of blower fan stall detection unit: J2 are blower fan current detecting pin, for giving blowing machine current signal, judge whether stall occurs for single-chip microcomputer.Be connected with power supply VCC by resistance R19, simultaneously through resistance R21 and resistance R20 dividing potential drop, electric capacity C4 filtering, enters the base stage of triode V5, and the emitter of V5 is connected to the ground, and the collector electrode of V5 is connected with power supply VCC1 by resistance R22.If 3 pin of J3 are low level, then V5 not conducting, FAN_FAUL is high level VCC1; If 3 pin of J3 are high level, then V5 conducting, FAN_FAUL is low level ground.
Air-blower control unit: FAN_CON is the control command that single chip control unit issues, if FAN_CON is high level, through resistance R18 and resistance R17 dividing potential drop, electric capacity C3 filtering, triode V4 conducting, the collector electrode of V4 is then zero.Meanwhile, the collector electrode of V4 is connected with power supply VCC by resistance R22, and be connected with power tube Q1 by resistance R23, then Q1 not conducting, is in high-impedance state.If FAN_CON is low level, then triode V4 not conducting, and then power tube Q1 conducting, then the voltage of power supply VCC is all added to 1 pin and 2 pin of blower fan, makes rotation speed of fan reach maximum.
As other mode of executions, namely blower fan, single chip control unit and temperature collecting cell, fan speed regulation unit can be implemented.Over-temperature protection unit, air-blower control unit, blower fan stall detection unit all can add as accessory structure as required.
Be presented above the embodiment that the present invention relates to, but the present invention is not limited to described mode of execution.Under the thinking that the present invention provides; the mode easily expected to those skilled in the art is adopted to convert the technological means in above-described embodiment, replace, revise; and the effect played goal of the invention that is substantially identical with the relevant art means in the present invention, that realize is also substantially identical; the technological scheme of such formation is carried out fine setting to above-described embodiment and is formed, and this technological scheme still falls within the scope of protection of the present invention.
Claims (6)
1. an adjustable speed fan, comprise single chip control unit and temperature collecting cell, it is characterized in that, temperature collecting cell connecting fan speed adjustment unit, described fan speed regulation unit input connects temperature collecting cell, export the positive and negative terminals of connecting fan power supply, temperature collecting cell output signal is carried on fan power, with the voltage between the positive and negative terminals controlling fan power.
2. a kind of adjustable speed fan according to claim 1, it is characterized in that, the current sense terminal of described adjustable speed fan connects a blower fan stall detection unit, and this blower fan stall detection unit sends into single chip control unit after being used for carrying out level conversion to current sense terminal output signal.
3. a kind of adjustable speed fan according to claim 1; it is characterized in that; described temperature collecting cell also connects an over-temperature protection unit, and the signal that temperature collecting cell exports sends into single chip control unit after the comparison and level conversion of over-temperature protection unit.
4. a kind of adjustable speed fan according to claim 1 or 2 or 3, it is characterized in that, described single chip control unit control connection air-blower control unit, this air-blower control unit comprises an electronic switch (Q1), and this electronic switch (Q1) is connected between power positive end and fan power anode.
5. a kind of adjustable speed fan according to claim 1, it is characterized in that, described temperature collecting cell comprises an operational amplifier (U2B), fan speed regulation unit comprises a dual-stage amplifier, operational amplifier (U2B) output terminal is connected to the base stage of first order amplifier (V2), the emitter of first order amplifier (V2) is connected with the base stage of second level amplifier (V3), the collector electrode of first order amplifier (V2) is connected with the collector electrode of second level amplifier (V3), and connect power positive end (VCC), the emitter connecting fan power positive end of second level amplifier (V3).
6. a kind of adjustable speed fan according to claim 5, is characterized in that, operational amplifier (U2B) output terminal is connected with ground connection voltage-stabiliser tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510753889.5A CN105257579B (en) | 2015-11-06 | 2015-11-06 | A kind of adjustable speed fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510753889.5A CN105257579B (en) | 2015-11-06 | 2015-11-06 | A kind of adjustable speed fan |
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| Publication Number | Publication Date |
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| CN105257579A true CN105257579A (en) | 2016-01-20 |
| CN105257579B CN105257579B (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510753889.5A Active CN105257579B (en) | 2015-11-06 | 2015-11-06 | A kind of adjustable speed fan |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109981005A (en) * | 2019-04-02 | 2019-07-05 | 深圳市恩玖科技有限公司 | A kind of DC fan driving circuit and the DC fan using the driving circuit |
| CN112003542A (en) * | 2019-07-18 | 2020-11-27 | 江西瑞华智能科技有限公司 | Fan speed regulation and over-temperature protection circuit based on temperature difference |
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| CN201039383Y (en) * | 2007-01-19 | 2008-03-19 | 青岛海信电器股份有限公司 | Self protection fan failure detection circuit and TV set with this circuit |
| CN201546996U (en) * | 2009-12-04 | 2010-08-11 | 泉州市协高微波电子有限公司 | Control circuit of intelligent fan |
| US20120161674A1 (en) * | 2010-12-23 | 2012-06-28 | Hsiao-Ping Hung | Dc motor speed controller of a range hood |
| CN202811438U (en) * | 2012-08-04 | 2013-03-20 | 谢安军 | Automatic speed control circuit of fan |
| CN203560130U (en) * | 2013-10-30 | 2014-04-23 | 深圳市晶福源电子技术有限公司 | Control circuit for controlling stepless speed regulation of fan in power supply device |
| CN103790845A (en) * | 2012-10-31 | 2014-05-14 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN204738991U (en) * | 2015-05-28 | 2015-11-04 | 深圳怡化电脑股份有限公司 | Fan control and protection circuit |
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2015
- 2015-11-06 CN CN201510753889.5A patent/CN105257579B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201039383Y (en) * | 2007-01-19 | 2008-03-19 | 青岛海信电器股份有限公司 | Self protection fan failure detection circuit and TV set with this circuit |
| CN201546996U (en) * | 2009-12-04 | 2010-08-11 | 泉州市协高微波电子有限公司 | Control circuit of intelligent fan |
| US20120161674A1 (en) * | 2010-12-23 | 2012-06-28 | Hsiao-Ping Hung | Dc motor speed controller of a range hood |
| CN202811438U (en) * | 2012-08-04 | 2013-03-20 | 谢安军 | Automatic speed control circuit of fan |
| CN103790845A (en) * | 2012-10-31 | 2014-05-14 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN203560130U (en) * | 2013-10-30 | 2014-04-23 | 深圳市晶福源电子技术有限公司 | Control circuit for controlling stepless speed regulation of fan in power supply device |
| CN204738991U (en) * | 2015-05-28 | 2015-11-04 | 深圳怡化电脑股份有限公司 | Fan control and protection circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109981005A (en) * | 2019-04-02 | 2019-07-05 | 深圳市恩玖科技有限公司 | A kind of DC fan driving circuit and the DC fan using the driving circuit |
| CN112003542A (en) * | 2019-07-18 | 2020-11-27 | 江西瑞华智能科技有限公司 | Fan speed regulation and over-temperature protection circuit based on temperature difference |
| CN112003542B (en) * | 2019-07-18 | 2024-04-02 | 江西瑞华智能科技有限公司 | Fan speed regulation and over-temperature protection circuit based on temperature difference |
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| Publication number | Publication date |
|---|---|
| CN105257579B (en) | 2017-05-31 |
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