CN205594473U - Take fan protection circuit of control by temperature change and soft start function - Google Patents
Take fan protection circuit of control by temperature change and soft start function Download PDFInfo
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- CN205594473U CN205594473U CN201520996936.4U CN201520996936U CN205594473U CN 205594473 U CN205594473 U CN 205594473U CN 201520996936 U CN201520996936 U CN 201520996936U CN 205594473 U CN205594473 U CN 205594473U
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- blower fan
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- 239000003990 capacitor Substances 0.000 claims abstract description 37
- 238000007599 discharging Methods 0.000 claims description 28
- 206010034719 Personality change Diseases 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model provides a take fan protection circuit of control by temperature change and soft start function, its characterized in that, outside DC power supply is connected to voltage stabilizing circuit's input, and its output is connected to soft start circuit, and it provides stable power supply voltage to soft start circuit when externally DC power supply power supply characteristic changes to have guaranteed, the capacitor discharge circuit is connected to soft start circuit's output to realize the soft start of fan, reduce its pick -up current, the incoming signal who takes the switching on and shutting down circuit of control by temperature change is ambient temperature signal and switching on and shutting down signal, and output signal is enable signal, takes the output of the switching on and shutting down circuit of control by temperature change to connect voltage stabilizing circuit and capacitor discharge circuit, adds control by temperature change circuit and switching on and shutting down circuit and can realize that fan switch is independent of outside DC power supply to receive temperature control, the capacitor discharge circuit passes through the capacitor discharge circuit and give capacitor discharge when fan (5) cuts off the power supply to prevent that electric capacity voltage feedback from giving outside DC power supply.
Description
Technical field
This patent relates to a kind of control method protecting blower fan normally to work in aircraft electrical power supply system, belongs to power electronic conversion
Category.
Background technology
In aircraft electrical power supply system, the power supply of DC fan is mostly by 28V powered by direct current, and the galvanic power supply characteristic of 28V
The most highly desirable, if input voltage range can be 22-30V, electric voltage over press is 40V, under-voltage for 16V etc..
For the power supply mode of blower fan, typically powered directly to blower fan by 28V unidirectional current, or 28V unidirectional current presses down through surge
Circuit fan processed is powered.
Directly the mode of power supply the most easily realizes, but for poor supplied character, there is the hidden danger that blower fan damages.Meanwhile, wind
The system that the switch of machine can not be powered independent of other uses 28V.
Mainly consider suppression 28V to again the mode of aviation power supply through surge restraint circuit and input surge, the electricity so that blower fan is powered
Within pressure is limited in safe voltage.This kind of method can only control the maximum of supply voltage, it is impossible to the supply voltage making blower fan is stable
A preferable value, the life-span of blower fan is had a certain impact.Meanwhile, if maximum suppression relatively low, when the most normally working
The loss of surge restraint circuit will be the biggest.
In order to suppress pulsation of current when blower fan works, typically in blower fan front end and a bulky capacitor, due to the existence of bulky capacitor,
After power-off, capacitance voltage can feed back in 28V current supply circuit, may have influence on other systems using 28V to power.
Investigating the operating characteristic of blower fan, on startup, the electric current during work of its starting current compared with normal is much larger；Further, flying
In the actual working environment of machine, there is the impact of high/low temperature.As when low temperature-55 DEG C, the starting current of blower fan will become more
Greatly, there is the hidden danger of fan starting transient breakdown.
Meanwhile, in pole low-temperature zone, the ambient temperature of whole cabinet is the lowest, and now natural cooling is enough, and blower fan is in always
Duty, not only have lost energy, the life-span of blower fan has also been lost.
Summary of the invention
This patent mainly solves problems with: on the basis of aircraft 28V power supply characteristic, protect blower fan so that it is can be steady
Surely work in a certain input voltage, and the switch of blower fan is independently controlled；Realize the soft start of blower fan, reduce starting current, with
Time, after blower fan power-off, it is provided that electric capacity discharge loop；In pole low-temperature zone, disconnect blower fan, it is to avoid blower fan is under severe conditions
Work long hours, extend its life-span.
The invention provides the blower fan protection circuit of a kind of band temperature control and soft start function, it is characterised in that include mu balanced circuit (1),
On/off circuit (2), soft starting circuit (3) and capacitor discharging circuit (4) with temperature control,
The input of mu balanced circuit connects external dc power, and its outfan is connected to soft starting circuit, it is ensured that at external dc
Stable supply voltage is provided to soft starting circuit during the change of power supply supplied character；
The outfan of soft starting circuit connects capacitor discharging circuit, to realize the soft start of blower fan, reduces its starting current；
The input signal of the on/off circuit with temperature control is ambient temperature signal and switching on and shutting down signal, and output signal is enable signal,
The outfan of the on/off circuit with temperature control connects mu balanced circuit and capacitor discharging circuit, adds temperature control circuit and on/off circuit can
Realize fan switch independent of external dc power and temperature controlled；
Capacitor discharging circuit is discharged to electric capacity when blower fan (5) power-off by capacitor discharging circuit, to prevent capacitance voltage from feeding back to
External dc power.
Further,
On/off circuit with temperature control includes the first resistance (R1), the second resistance (R2), the first optocoupler (U1), the second optocoupler (U2)、
First diode (D1), the first stabilivolt (Z1), the first audion (Q1), the first electric capacity (C1) and the first electric capacity (C2), switching on and shutting down
The positive terminal of signal is to the first diode (D1) anode, the first diode (D1) negative electrode connects the first resistance (R1) first
End and the first audion (Q1) colelctor electrode, the first audion (Q1) base stage connect the first resistance (R respectively1) the second end and
One stabilivolt (Z1) cathode terminal, the first audion (Q1) emitter stage connect the second resistance (R2) the first end and the first electric capacity (C1)
The first end, the second resistance (R2) the second end connect the first optocoupler (U1) anode, switching on and shutting down signal negative pole end connects the
One stabilivolt (Z1) anode, the first electric capacity (C1) the second end and the first optocoupler (U1) negative electrode, the first optocoupler (U1) collection
Electrode output switch machine enables signal, the first optocoupler (U1) emitter stage connect the second optocoupler (U2) colelctor electrode, the second light
Coupling (U2) anode, negative electrode and the second electric capacity (C2) and Temperature Controlling Chip (2-1) parallel connection, the second optocoupler (U2) emitter stage connect
Ground.
Further,
Described soft starting circuit includes the 3rd resistance (R3), the 4th resistance (R4), the second stabilivolt (Z2), the second power tube (Q2) and the
Three electric capacity (C3), the 4th resistance (R4) one end connection, capacitor discharging circuit, capacitive load (CLoad) and the input of blower fan positive pole, separately
One end connects the second stabilivolt (Z2) negative electrode, the 3rd electric capacity (C3) the first end, the second power tube (Q2) grid, the second power
Pipe (Q2) source electrode connect the second stabilivolt (Z2) anode, the 3rd electric capacity (C3) the second end, the 3rd resistance (R3) the first end and steady
The negative pole output of volt circuit, the second power tube (Q2) drain electrode connect the 3rd resistance (R3) the second end, capacitor discharging circuit (4),
Capacitive load (CLoad) and the input of blower fan (5) negative pole.
Further,
Described capacitor discharging circuit includes the 5th resistance (R5), the 6th resistance (R6), the 3rd stabilivolt (Z3), the 3rd power tube
(Q3), the 4th electric capacity (C4) and the 3rd optocoupler (U3), the 3rd optocoupler (U3) anode input connect start enable signal,
3rd optocoupler (U3) minus earth, the 3rd optocoupler (U3) drain electrode connect the 5th resistance (R5) the first end, the 3rd merit
Rate pipe (Q3) grid, the 4th electric capacity (C4) the first end and the 3rd stabilivolt (Z3) negative electrode, the 3rd optocoupler (U3)
Source electrode connect the 3rd stabilivolt (Z3) anode the 4th electric capacity (C4) the second end, the 3rd power tube Q3Source electrode, electric capacity
Load CLoadInput with blower fan negative pole, the 3rd power tube (Q3) drain electrode connect the 6th resistance (R6) the first end, the 6th electricity
Resistance (R6) second end connect the 5th resistance (R5) the second end, capacitive load (CLoad) and the input of blower fan (5) positive pole.
By adding mu balanced circuit, this utility model patent ensure that energy fan provides when 28V DC source supplied character changes
Stable supply voltage；Mu balanced circuit is controlled, to realize fan switch independent of 28V power supply by on/off circuit；Add soft
Start-up circuit, to realize the soft start of blower fan, reduces its starting current；By capacitor discharging circuit when blower fan power-off to electric capacity
Electric discharge, to prevent capacitance voltage from feeding back to 28V power supply；Avoid blower fan by temperature control circuit to work at extremely low temperature mal-condition.
This utility model patent improves performance when blower fan normally works, it is to avoid feedback influence to 28V power supply, effectively extends
Life-span of blower fan.
It is applicable to the protection circuit of DC fan.
Accompanying drawing explanation
Accompanying drawing 1 is the structured flowchart of this utility model patent；
Accompanying drawing 2 is the schematic diagram of the on/off circuit of band temperature control in this utility model patent；
Accompanying drawing 3 is the schematic diagram of soft starting circuit in this utility model patent；
Accompanying drawing 4 is the schematic diagram of capacitor discharging circuit in this utility model patent；
Symbol C in above-mentioned accompanying drawingLoadFor bulky capacitor in parallel before blower fan, V1For stabilized circuit outputting voltage, VoFor blower fan two ends
Voltage, IoFor flowing through the electric current of blower fan, U1, U2, U3For optocoupler, Q1For audion, Q2, Q3For power tube, R1、R2、
R3、R4、R5、R6For power resistor, D1For diode, (Z1), Z2, Z3For stabilivolt, C1, C2, C3, C4For electric capacity.
Detailed description of the invention
In order to illustrate technical solutions of the utility model, below in conjunction with the accompanying drawings and embodiment, this utility model is described in detail.
Should be appreciated that embodiment described herein is only to explain this utility model, but not as restriction of the present utility model.
Seeing Fig. 1, the blower fan protection circuit logic chart of a kind of band temperature control of this utility model embodiment and soft start function, it includes
Mu balanced circuit 1, the on/off circuit 2 of band temperature control, soft starting circuit 3 and capacitor discharging circuit 4.Wherein, mu balanced circuit is defeated
Entering end and connect external dc power, its outfan is connected to soft starting circuit, it is ensured that change at external dc power supplied character
Time provide stable supply voltage to soft starting circuit；The outfan of soft starting circuit connects capacitor discharging circuit, to realize blower fan
Soft start, reduce its starting current；The input signal of the on/off circuit with temperature control is ambient temperature signal and switching on and shutting down signal,
The outfan of the on/off circuit with temperature control connects mu balanced circuit and capacitor discharging circuit, adds temperature control circuit and on/off circuit can
Realize fan switch independent of external dc power and temperature controlled；Capacitor discharging circuit passes through capacitor discharging circuit at blower fan
Discharge to electric capacity during power-off, to prevent capacitance voltage from feeding back to external dc power.
See Fig. 2, the on/off circuit schematic diagram of this utility model embodiment a kind of band temperature control.The on/off circuit of this band temperature control
Including the first resistance R1, the second resistance R2, the first optocoupler U1, the second optocoupler U2、First diode D1, the first stabilivolt Z1、
First audion Q1, the first electric capacity C1With the first electric capacity C2, the positive terminal of switching on and shutting down signal to the first diode D1Anode, the
One diode D1Negative electrode connects the first resistance R1The first end and the first audion Q1Colelctor electrode, the first audion Q1Base
Pole connects the first resistance R respectively1The second end and the first stabilivolt Z1Cathode terminal, the first audion Q1Emitter stage connect the
Two resistance R2The first end and the first electric capacity C1The first end, the second resistance R2The second end connect the first optocoupler U1Anode,
Switching on and shutting down signal negative pole end connects the first stabilivolt Z1Anode, the first electric capacity C1The second end and the first optocoupler U1Negative electrode,
First optocoupler U1Colelctor electrode output switch machine enable signal, the first optocoupler U1Emitter stage connect the second optocoupler U2Colelctor electrode,
Second optocoupler U2Anode, negative electrode and the second electric capacity C2In parallel with Temperature Controlling Chip 2-1, the second optocoupler U2Grounded emitter.
See Fig. 3, this utility model embodiment one soft starting circuit schematic diagram.This soft starting circuit includes the 3rd resistance R3,
4th resistance R4, the second stabilivolt Z2, the second power tube Q2, the 3rd electric capacity C3, the 4th resistance R4One end connects, electric capacity is put
Electricity circuit, capacitive load CLoadInputting with blower fan positive pole, the other end connects the second stabilivolt Z2Negative electrode, the 3rd electric capacity C3's
First end, the second power tube Q2Grid, the second power tube Q2Source electrode connect the second stabilivolt Z2Anode, the 3rd electric capacity
C3The second end, the 3rd resistance R3The first end and mu balanced circuit negative pole output, the second power tube Q2Drain electrode connect the 3rd
Resistance R3The second end, capacitor discharging circuit, capacitive load CLoadInput with blower fan negative pole.
See Fig. 4, this utility model embodiment one capacitor discharging circuit schematic diagram.This capacitor discharging circuit includes the 5th resistance
R5, the 6th resistance R6, the 3rd stabilivolt Z3, the 3rd power tube Q3, the 4th electric capacity C4With the 3rd optocoupler U3, the 3rd optocoupler
U3Anode input connect start enable signal, the 3rd optocoupler U3Minus earth, the 3rd optocoupler U3Drain electrode connect the 5th electricity
Resistance R5The first end, the 3rd power tube Q3Grid, the 4th electric capacity C4The first end and the 3rd stabilivolt Z3Negative electrode, the 3rd
Optocoupler U3Source electrode connect the 3rd stabilivolt Z3Anode the 4th electric capacity C4The second end, the 3rd power tube Q3Source electrode, electricity
Hold load CLoadInput with blower fan negative pole, the 3rd power tube Q3Drain electrode connect the 6th resistance R6The first end, the 6th resistance R6
Second end connect the 5th resistance R5The second end, capacitive load CLoadInput with blower fan positive pole.
Operation principle of the present utility model is:
After external dc power is opened, blower fan is standby；Receive starting-up signal, blower fan under temperature control circuit judges Current Temperatures simultaneously
Work, on/off circuit output start enables signal to mu balanced circuit.It is the on/off circuit of a kind of band temperature control as shown in Figure 2,
When switching on and shutting down signal and temperature all meet condition, optocoupler U1, U2Simultaneously turning on, start enables signal and links ground, makes voltage stabilizing electricity
Start working in road.And when one of them is unsatisfactory for condition, one of them optocoupler disconnects, it is unsettled that start enables signal, makes voltage stabilizing
Circuit quits work.
Mu balanced circuit starts, with the voltage V set1Output.By regulation voltage V1Realize the reliable work of safety and stability of blower fan
Make.
The voltage V of mu balanced circuit output1Being powered by soft starting circuit fan, wherein, soft starting circuit on startup, makes wind
The voltage V at the two ends of machineoSlowly set up, to reduce the starting current of blower fan.It is a kind of soft starting circuit as shown in Figure 3,
Blower fan current supply circuit gone here and there a power tube Q1, and at power tube at a power resistor R in parallel1.As voltage V1Just set up
Time, power tube Q1Do not turn on, blower fan and power resistor R1Distribution output voltage V1, so flow through the electric current I of blower fanoWith on blower fan
Voltage VoBecome negative feedback relation, limit the electric current I flowing through blower fano, i.e. starting current；Voltage V1After foundation, to power tube
Q1Gate capacitance charging, make gate voltage slowly set up, slowly open power tube Q1, make power resistor R1On the voltage got
It is gradually reduced, blower fan both end voltage VoIt is gradually increasing, until blower voltage VoReach normal value, complete to start.
Capacitor discharging circuit, when blower fan power-off, receives " shutdown " signal of on/off circuit, star t-up discharge circuit, gives electricity
Discharge capacitor.Being a kind of capacitor discharging circuit as shown in Figure 4, when off signal arrives, blower fan power-off, now, electric capacity discharges
Circuit have received off signal also by on/off circuit, makes optocoupler U3Disconnect, then the voltage V on electric capacityoPower tube will be given
Q2Gate capacitance charging, after gate voltage reaches to open threshold values, power tube Q2Conducting, provides discharge loop to electric capacity.
The present embodiment under-voltage protecting circuit element is few, and circuit is simple, adds circuit reliability, is practically applicable to volume, reliability
Require higher military demand.
These are only preferred embodiment of the present utility model, for those skilled in the art, this utility model is permissible
There are various modifications and variations.On the premise of without departing from this utility model principle, any amendment, the equivalent made substitute and change
Enter, within should be included in right of the present utility model.
Claims (4)
1. a band temperature control and the blower fan protection circuit of soft start function, it is characterised in that include mu balanced circuit (1), the on/off circuit (2) of band temperature control, soft starting circuit (3) and capacitor discharging circuit (4),
The input of mu balanced circuit connects external dc power, and its outfan is connected to soft starting circuit, it is ensured that provide stable supply voltage when external dc power supplied character changes to soft starting circuit；
The outfan of soft starting circuit connects capacitor discharging circuit, to realize the soft start of blower fan, reduces its starting current；
The input signal of the on/off circuit with temperature control is ambient temperature signal and switching on and shutting down signal, output signal is for enabling signal, the outfan of the on/off circuit with temperature control connects mu balanced circuit and capacitor discharging circuit, it is independent of external dc power and temperature controlled that addition temperature control circuit and on/off circuit can realize fan switch；
Capacitor discharging circuit is discharged to electric capacity when blower fan (5) power-off by capacitor discharging circuit, to prevent capacitance voltage from feeding back to external dc power.
Band temperature control the most according to claim 1 and the blower fan protection circuit of soft start function, it is characterised in that
On/off circuit with temperature control includes the first resistance (R1), the second resistance (R2), the first optocoupler (U1), the second optocoupler (U2), the first diode (D1), the first stabilivolt (Z1), the first audion (Q1), the first electric capacity (C1) and the first electric capacity (C2), the positive terminal of switching on and shutting down signal to the first diode (D1) anode, the first diode (D1) negative electrode connects the first resistance (R1) the first end and the first audion (Q1) colelctor electrode, the first audion (Q1) base stage connect the first resistance (R respectively1) the second end and the first stabilivolt (Z1) cathode terminal, the first audion (Q1) emitter stage connect the second resistance (R2) the first end and the first electric capacity (C1) the first end, the second resistance (R2) the second end connect the first optocoupler (U1) anode, switching on and shutting down signal negative pole end connects the first stabilivolt (Z1) anode, the first electric capacity (C1) the second end and the first optocoupler (U1) negative electrode, the first optocoupler (U1) colelctor electrode output switch machine enable signal, the first optocoupler (U1) emitter stage connect the second optocoupler (U2) colelctor electrode, the second optocoupler (U2) anode, negative electrode and the second electric capacity (C2) and Temperature Controlling Chip (2-1) parallel connection, the second optocoupler (U2) grounded emitter.
Band temperature control the most according to claim 1 and the blower fan protection circuit of soft start function, it is characterised in that described soft starting circuit includes the 3rd resistance (R3), the 4th resistance (R4), the second stabilivolt (Z2), the second power tube (Q2) and the 3rd electric capacity (C3), the 4th resistance (R4) one end connection, capacitor discharging circuit, capacitive load (CLoad) and the input of blower fan positive pole, the other end connects the second stabilivolt (Z2) negative electrode, the 3rd electric capacity (C3) the first end, the second power tube (Q2) grid, the second power tube (Q2) source electrode connect the second stabilivolt (Z2) anode, the 3rd electric capacity (C3) the second end, the 3rd resistance (R3) the first end and mu balanced circuit negative pole output, the second power tube (Q2) drain electrode connect the 3rd resistance (R3) the second end, capacitor discharging circuit (4), capacitive load (CLoad) and the input of blower fan (5) negative pole.
Band temperature control the most according to claim 1 and the blower fan protection circuit of soft start function, it is characterised in that described capacitor discharging circuit includes the 5th resistance (R5), the 6th resistance (R6), the 3rd stabilivolt (Z3), the 3rd power tube (Q3), the 4th electric capacity (C4) and the 3rd optocoupler (U3), the 3rd optocoupler (U3) anode input connect start enable signal, the 3rd optocoupler (U3) minus earth, the 3rd optocoupler (U3) drain electrode connect the 5th resistance (R5) the first end, the 3rd power tube (Q3) grid, the 4th electric capacity (C4) the first end and the 3rd stabilivolt (Z3) negative electrode, the 3rd optocoupler (U3) source electrode connect the 3rd stabilivolt (Z3) anode the 4th electric capacity (C4) the second end, the 3rd power tube (Q3)Source electrode, capacitive load (CLoad) and the input of blower fan negative pole, the 3rd power tube (Q3) drain electrode connect the 6th resistance (R6) the first end, the 6th resistance (R6) second end connect the 5th resistance (R5) the second end, capacitive load (CLoad) and the input of blower fan (5) positive pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520996936.4U CN205594473U (en) | 2015-12-03 | 2015-12-03 | Take fan protection circuit of control by temperature change and soft start function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520996936.4U CN205594473U (en) | 2015-12-03 | 2015-12-03 | Take fan protection circuit of control by temperature change and soft start function |
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| Publication Number | Publication Date |
|---|---|
| CN205594473U true CN205594473U (en) | 2016-09-21 |
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ID=56926734
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520996936.4U Expired - Fee Related CN205594473U (en) | 2015-12-03 | 2015-12-03 | Take fan protection circuit of control by temperature change and soft start function |
Country Status (1)
| Country | Link |
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| CN (1) | CN205594473U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257192A (en) * | 2017-05-19 | 2017-10-17 | 苏州汇川联合动力系统有限公司 | A kind of passive electric discharge device and electric machine controller |
| CN111030436A (en) * | 2019-12-02 | 2020-04-17 | 上海移远通信技术股份有限公司 | A discharge protection circuit |
| TWI790104B (en) * | 2022-01-24 | 2023-01-11 | 神雲科技股份有限公司 | Soft-start discharging circuit |
-
2015
- 2015-12-03 CN CN201520996936.4U patent/CN205594473U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257192A (en) * | 2017-05-19 | 2017-10-17 | 苏州汇川联合动力系统有限公司 | A kind of passive electric discharge device and electric machine controller |
| CN111030436A (en) * | 2019-12-02 | 2020-04-17 | 上海移远通信技术股份有限公司 | A discharge protection circuit |
| CN111030436B (en) * | 2019-12-02 | 2021-09-14 | 上海移远通信技术股份有限公司 | Discharge protection circuit |
| TWI790104B (en) * | 2022-01-24 | 2023-01-11 | 神雲科技股份有限公司 | Soft-start discharging circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160921 Termination date: 20211203 |
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| CF01 | Termination of patent right due to non-payment of annual fee |