CN207424135U - The fault detection circuit of DC fan and DC fan system - Google Patents
The fault detection circuit of DC fan and DC fan system Download PDFInfo
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- CN207424135U CN207424135U CN201721469866.2U CN201721469866U CN207424135U CN 207424135 U CN207424135 U CN 207424135U CN 201721469866 U CN201721469866 U CN 201721469866U CN 207424135 U CN207424135 U CN 207424135U
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Abstract
The utility model provides a kind of fault detection circuit and DC fan system of DC fan, and the fault detection circuit includes the sample circuit, amplifying circuit and the fault judging circuit that are sequentially connected in series；Sample circuit is used to the current signal of DC fan being converted to first voltage signal；Amplifying circuit is used to carry out first voltage signal the amplification of preset multiple, obtains second voltage signal, and by second voltage signal output to fault judging circuit；Fault judging circuit is used for according to second voltage signal and default first threshold and second threshold, judge DC fan whether failure.Fault detection circuit provided by the utility model, it can be realized with common base chip, and it is patch encapsulation, so that fault detection circuit occupies little space, it is at low cost, and circuit is simple, for ease of maintenaince, so as to solve the problems, such as that the applicability being detected in the prior art using current sensor to the electric current of DC fan is low.
Description
Technical field
The utility model is related to fan failure detection technique field more particularly to a kind of fault detection circuits of DC fan
With DC fan system.
Background technology
Electronic device being widely used in all trades and professions is general.Caloric value is big at work for usual electronic device, if
It radiates not in time, electronic device temperature can be caused to raise, the service life that long-term work can influence electronic device even damages electronics device
Part.It is a kind of effective heat dissipation to carry out heat dissipation to electronic device using DC fan.However also can during DC fan work
It breaks down, if the failure of DC fan cannot be detected in time, unnecessary loss may be brought to electronic device, because
This, the detection carried out promptly and accurately for the failure of DC fan is particularly important.
At present, a kind of method for fault detect being carried out to DC fan is to detect DC fan using current sensor
Electric current, such as：Then Hall sensor etc. judges above-mentioned testing result or by processor program by setting
Meter circuit analyzes above-mentioned testing result, so as to obtain the working condition of DC fan.
However, although the above method can accurately detect electric current using current sensor, current sense
The occupied space of device is big, and for the field that some space requirements are stringenter, applicability is low.
Utility model content
The utility model provides a kind of fault detection circuit and DC fan system of DC fan, can be to DC fan
Fault detect is carried out, has the characteristics that occupy little space, is at low cost and for ease of maintenaince, solving in the prior art using electric current biography
The problem of applicability of sensor progress current detecting is low.
In a first aspect, the fault detection circuit of DC fan provided by the utility model, including：Sample circuit, amplification electricity
Road and fault judging circuit；
The sample circuit, the amplifying circuit and the fault judging circuit are sequentially connected in series；
The sample circuit, for the current signal of the DC fan to be converted to first voltage signal, and by described in
First voltage signal output gives the amplifying circuit；
The amplifying circuit for carrying out the amplification of preset multiple to the first voltage signal, obtains second voltage letter
Number, and give the second voltage signal output to the fault judging circuit；
The fault judging circuit, for according to the second voltage signal and default first threshold and the second threshold
Value, judge the DC fan whether failure, and will determine that result is exported to the interface of external circuit.
Optionally, the fault judging circuit includes：First comparison circuit, the second comparison circuit and logical AND gate circuit,
After first comparison circuit and the second comparison circuit parallel connection with the logical AND gate circuit connected in series；
First comparison circuit, for by the second voltage signal compared with the default first threshold,
The first comparative result is obtained, and first comparative result is exported to the logical AND gate circuit；
Second comparison circuit, for by the second voltage signal compared with the default second threshold,
The second comparative result is obtained, and second comparative result is exported to the logical AND gate circuit；
The logical AND gate circuit, for first comparative result and second comparative result to be carried out logical AND fortune
It calculates, obtains the 3rd comparative result, and the 3rd comparative result is exported to the interface of the external circuit.
Optionally, the fault judging circuit further includes pull-up circuit, the pull-up circuit and the logical AND gate circuit
Connection；
The pull-up circuit, under predetermined condition, comparing knot by the described 3rd of the logical AND gate circuit output the
Fruit is arranged to high level, and the high level output is given to the interface of the external circuit, wherein, the high level is used to indicate
DC fan is in non-faulting state.
Optionally, the fault detection circuit further includes optical coupling isolation circuit, the primary side of the optical coupling isolation circuit and institute
Fault judging circuit connection is stated, the secondary of the optical coupling isolation circuit is connected with the external circuit.
Optionally, the fault detection circuit further includes current foldback circuit, the input terminal of the current foldback circuit with
DC fan connects, and the output terminal of the current foldback circuit is connected with the sample circuit.
Optionally, the sample circuit is additionally operable to be filtered the current signal of the DC fan.
Optionally, the fault judging circuit further includes：First threshold sets circuit and second threshold sets circuit, described
First threshold sets circuit to be connected with first comparison circuit, and the second threshold sets circuit and second comparison circuit
Connection；
The first threshold sets circuit for setting the first threshold；
The second threshold sets circuit for setting the second threshold.
Optionally, first comparison circuit, if being more than the first threshold specifically for the second voltage signal,
To the logical AND gate circuit output low level, otherwise, to the logical AND gate circuit output high level；
Second comparison circuit, if being less than the second threshold specifically for the second voltage signal, to described
Logical AND gate circuit output low level, otherwise, to the logical AND gate circuit output high level；
Wherein, the low level is used to indicate the DC fan and is in malfunction, and the high level is used to indicate institute
It states DC fan and is in non-faulting state.
Optionally, the current foldback circuit includes fuse.
Second aspect, DC fan system provided by the utility model, including DC fan and as described in relation to the first aspect
DC fan fault detection circuit.
DC fan fault detection circuit provided by the utility model, including sample circuit, amplifying circuit and breakdown judge
Circuit, sample circuit, amplifying circuit and fault judging circuit are sequentially connected in series, and sample circuit is used for the current signal of DC fan
First voltage signal is converted to, and by first voltage signal output to amplifying circuit；Amplifying circuit is used for first voltage signal
The amplification of preset multiple is carried out, obtains second voltage signal, and by second voltage signal output to fault judging circuit；Failure is sentenced
Deenergizing is used for according to second voltage signal and default first threshold and second threshold, to judge whether DC fan is former
Barrier, and will determine that result is exported to the interface of external circuit, carry out fault detect so as to fulfill to DC fan.The utility model
The DC fan fault detection circuit of offer, sample circuit therein, amplifying circuit and fault judging circuit can be selected common
Base chip realize, and be patch encapsulation so that the fault detection circuit occupies little space, at low cost, and electricity
Road is simple, for ease of maintenaince, low so as to solve the applicability being detected in the prior art using current sensor to electric current
Problem；Further, in fault judging circuit, carried out according to second voltage signal and default first threshold and second threshold
Compare, come judge DC fan whether failure so that the fault detection circuit can both detect the excessive situation of electric current, example
Such as：DC fan stall or DC fan short circuit etc. can also detect the too small situation of electric current, such as：DC fan open circuit,
DC fan is not in place or DC fan reversal connection etc., so as to improve the fault detection accuracy of DC fan.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the structure diagram of DC fan fault detection circuit embodiment one provided by the utility model；
Fig. 2 is the structure diagram of DC fan fault detection circuit embodiment two provided by the utility model；
Fig. 3 is the structure diagram of DC fan fault detection circuit embodiment three provided by the utility model；
Fig. 4 is the structure diagram of DC fan system embodiment provided by the utility model.
Reference sign：
10：DC fan fault detection circuit；
11：Sample circuit；
12：Amplifying circuit；
13：Fault judging circuit；
14：Optical coupling isolation circuit；
15：Current foldback circuit；
20：DC fan；
131：First comparison circuit；
132：Second comparison circuit；
133：Logical AND gate circuit；
134：Pull-up circuit；
135：First threshold sets circuit；
136：Second threshold sets circuit.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained shall fall within the protection scope of the present invention.
Term " first " in the specification and claims of the utility model and above-mentioned attached drawing, " second ", " the 3rd "
(if present)s such as " the 4 " are the objects for distinguishing similar, without being used to describe specific order or precedence.It should
The data that the understanding so uses can exchange in the appropriate case.In addition, term " comprising " and " having " and their times
What deform, it is intended that cover it is non-exclusive include, for example, contain the process of series of steps or unit, method, system,
Product or equipment are not necessarily limited to those steps or unit clearly listed, but may include not list clearly or for
The intrinsic other steps of these processes, method, product or equipment or unit.
DC fan refers to through input direct-current electric energy, makes dc motor rotation so that draught fan impeller to be driven to rotate, so as to
Realize wind turbine of the direct current energy to mechanical energy transfer process.As previously mentioned, carrying out heat dissipation to electronic device using DC fan is
A kind of common heat dissipation, can also break down when being worked due to DC fan, if DC fan cannot be detected in time
Failure, may bring unnecessary loss to electronic device, therefore, be carried out promptly and accurately for the failure of DC fan
Detection is particularly important.
At present, a kind of method for fault detect being carried out to DC fan is to detect DC fan using current sensor
Electric current, such as：Then Hall sensor etc. judges above-mentioned testing result or by processor program by setting
Meter circuit analyzes above-mentioned testing result, so as to obtain the working condition of DC fan.However, the above method uses electric current
Although sensor can accurately detect electric current, the occupied space of current sensor is big, of high cost, and electricity
The power supply circuit of flow sensor is complicated, and maintenance difficulty is big, causes for the not high field of some required precisions, the above method is fitted
It is low with property.
DC fan fault detection circuit provided by the utility model, including sample circuit, amplifying circuit and breakdown judge
Circuit, sample circuit, amplifying circuit and fault judging circuit are sequentially connected in series, and sample circuit is used for the current signal of DC fan
First voltage signal is converted to, and by first voltage signal output to amplifying circuit；Amplifying circuit is used for first voltage signal
The amplification of preset multiple is carried out, obtains second voltage signal, and by second voltage signal output to fault judging circuit；Failure is sentenced
Deenergizing is used for according to second voltage signal and default first threshold and second threshold, to judge whether DC fan is former
Barrier, and will determine that result is exported to the interface of external circuit, carry out fault detect so as to fulfill to DC fan.The utility model
The DC fan fault detection circuit of offer, sample circuit therein, amplifying circuit and fault judging circuit can be selected common
Base chip realize, and be patch encapsulation so that the fault detection circuit occupies little space, at low cost, and electricity
Road is simple, for ease of maintenaince, low so as to solve the applicability being detected in the prior art using current sensor to electric current
Problem；Further, in fault judging circuit, sentenced according to second voltage signal and default first threshold and second threshold
Disconnected DC fan whether failure so that the fault detection circuit can both detect the excessive situation of electric current, such as：Direct current wind
Machine stall or DC fan short circuit etc. can also detect the too small situation of electric current, such as：DC fan open circuit, DC fan
Not in place or DC fan reversal connection etc., so as to improve the fault detection accuracy of DC fan.
The technical solution of the utility model is described in detail with specific embodiment below.These are specific below
Embodiment can be combined with each other, and may be repeated no more for the same or similar concept or process in some embodiments.
DC fan fault detection circuit provided by the utility model is applicable to carry out all types of DC fans
Fault detect, such as：In the common 24V DC fans of track transportation industry.
Fig. 1 is the structure diagram of DC fan fault detection circuit embodiment one provided by the utility model, such as Fig. 1 institutes
Show, DC fan fault detection circuit 10 provided in this embodiment, including：Sample circuit 11, amplifying circuit 12 and breakdown judge
Circuit 13；Sample circuit 11, amplifying circuit 12 and fault judging circuit 13 are sequentially connected in series；Sample circuit 11 is used for DC fan
The current signal of (not shown) is converted to first voltage signal, and by first voltage signal output to amplifying circuit 12；Amplification electricity
Road 12 is used to carry out first voltage signal the amplification of preset multiple, obtains second voltage signal, and second voltage signal is defeated
Go out to fault judging circuit 13；Fault judging circuit 13 is used for according to second voltage signal and default first threshold and second
Threshold value, judge DC fan whether failure, and will determine that result exports and give external circuit interface (not shown).
Specifically, the input terminal of sample circuit 11 is connected with DC fan (not shown), the output terminal of sample circuit 11 with
The input terminal connection of amplifying circuit 12, the output terminal of amplifying circuit 12 are connected with the input terminal of fault judging circuit 13, and failure is sentenced
The output terminal of deenergizing 13 is connected with external circuit interface (not shown).
It should be understood that specific element and its connection relation inside sample circuit 11, the utility model do not limit specifically
It is fixed, the current signal of DC fan is converted into voltage signal as long as can realize.Specific element inside amplifying circuit 12
And its connection relation, the utility model are also not especially limited, and preset multiple is carried out to first voltage signal as long as can realize
Amplification obtains second voltage signal.Specific element and its connection relation inside fault judging circuit 13, the utility model
Also be not especially limited, if can realize according to amplifying circuit 12 export second voltage signal and default first threshold and
Relation between second threshold, judge DC fan whether failure.
It should be noted that the amplification that amplifying circuit 12 carries out first voltage signal preset multiple obtains second voltage letter
Number, specific amplification factor is that setting is adjusted according to default first threshold and second threshold in fault judging circuit 13,
So that can by by second voltage signal compared with first threshold and second threshold, come judge DC fan whether therefore
Barrier.
It should be understood that first threshold is more than second threshold, first threshold is used to judge whether second voltage signal is more than
The first threshold, second threshold are used to judge whether second voltage signal is less than the second threshold.Fault judging circuit 13
Be according to the relation between second voltage signal and first threshold and second threshold come judge DC fan whether failure.Specifically
Determination methods can there are many, be not especially limited herein.The possible determination methods of one of which are exemplified below：In reality
When designing circuit, first threshold is arranged to the corresponding voltage threshold of current upper limit value of DC fan, second threshold is arranged to
The corresponding voltage threshold of floor level of electric current of DC fan.Fault judging circuit 13 is when being judged, if second voltage signal
Between first threshold and second threshold, then it is assumed that DC fan is in non-faulting state；If second voltage signal is more than the
One threshold value, then it is assumed that DC fan is in malfunction, and the failure can so that the electric current of DC fan is more than upper current limit
Value, such as：DC fan locked rotor condition or DC fan short-circuit condition etc.；If second voltage signal is less than second threshold, recognize
Malfunction is in for DC fan, and the failure can cause the electric current of DC fan to be not up to floor level of electric current, such as：Directly
Flow fan open circuit, DC fan output power deficiency, DC fan is not in place or DC fan reversal connection etc..It should be noted that
The current upper limit value and floor level of electric current is configured according to the actual index of DC fan, for example, upper current limit
Value could be provided as the value near the rated current or rated current of DC fan, and floor level of electric current could be provided as being not enough to
Make the current value that DC fan works together.
In the present embodiment, DC fan fault detection circuit 10 includes the sample circuit 11, the amplifying circuit 12 that are sequentially connected in series
With fault judging circuit 13, wherein, be used to the current signal of DC fan being converted to first voltage signal using circuit 11, and
By first voltage signal output to amplifying circuit 12；Amplifying circuit 12 is used to put first voltage signal progress preset multiple
Greatly, second voltage signal is obtained, and by second voltage signal output to fault judging circuit 13；Fault judging circuit 13 is used for root
According to second voltage signal and default first threshold and second threshold, come judge DC fan whether failure, and will determine that knot
Fruit, which exports, gives external circuit interface, and fault detect is carried out so as to fulfill to DC fan.DC fan provided by the utility model
Common basis can be selected in fault detection circuit 10, sample circuit 11 therein, amplifying circuit 12 and fault judging circuit 13
Chip is realized, and is patch encapsulation so that fault detection circuit 10 occupies little space, at low cost, and circuit is simple, easily
In repair, so as to solve the problems, such as that the applicability being detected in the prior art using current sensor to electric current is low；Into one
Step, in fault judging circuit 13, direct current is judged according to second voltage signal and default first threshold and second threshold
Wind turbine whether failure so that the fault detection circuit 10 can both detect the excessive situation of electric current, such as：DC fan blocks up
Turn or DC fan short circuit etc., can also detect the too small situation of electric current, such as：DC fan open circuit, DC fan do not exist
Position, DC fan reversal connection or DC fan output power deficiency etc., so as to improve the fault detection accuracy of DC fan.
Fig. 2 be DC fan fault detection circuit embodiment two provided by the utility model structure diagram, this implementation
The DC fan fault detection circuit 10 that example provides is shown in Fig. 1 on the basis of embodiment, to the knot of fault judging circuit 13
Structure is refined, and provides the optional embodiment of one of which of fault judging circuit 13.As shown in Fig. 2, breakdown judge
Circuit 13 includes：First comparison circuit 131, the second comparison circuit 132 and logical AND gate circuit 133,131 He of the first comparison circuit
It connects after second comparison circuit, 132 parallel connection with logical AND gate circuit 133.First comparison circuit 131, for by second voltage signal
Compared with default first threshold, the first comparative result is obtained, and the first comparative result is exported and gives logical AND gate circuit
133；Second comparison circuit 132 compares knot for second voltage signal compared with default second threshold, to be obtained second
Fruit, and the second comparative result is exported to logical AND gate circuit 133；Logical AND gate circuit 133, for by the first comparative result and
Second comparative result carries out logic and operation, obtains the 3rd comparative result, and the 3rd comparative result is exported and is connect to external circuit
Mouthful.
Specifically, the input terminal of the first comparison circuit 131 and the second comparison circuit 132 and the output terminal of amplifying circuit 12 connect
It connects, the input terminal of the output terminal after 132 parallel connection of the first comparison circuit 131 and the second comparison circuit and logical AND gate circuit 133 connects
It connects.
Optionally, the first comparison circuit 131, if being more than first threshold specifically for second voltage signal, to logical AND
Gate circuit 133 exports low level, otherwise, high level is exported to logical AND gate circuit 133；Second comparison circuit 132, is specifically used for
If second voltage signal is less than second threshold, low level is exported to logical AND gate circuit 133, otherwise, to logical AND gate circuit
133 output high level.
Wherein, low level is used to indicate DC fan and is in malfunction, and high level is used to indicate DC fan and is in non-
Malfunction.
Optionally, fault judging circuit 13 further includes：First threshold sets circuit 135 and second threshold to set circuit 136,
First threshold sets circuit 135 to be connected 131 with the first comparison circuit, and second threshold sets 136 and second comparison circuit 132 of circuit
Connection；First threshold sets circuit 135 for setting first threshold, and first threshold is exported to the first comparison circuit 131；The
Two threshold values set circuit 136 for setting second threshold, and second threshold is exported to the second comparison circuit 132.
In the present embodiment, for fault judging circuit 13 whether there are two comparison circuits, it is more than on electric current that can be carried out at the same time
Limit value and the judgement for whether being not up to two kinds of fault conditions of floor level of electric current improve the fault detect accuracy rate of DC fan.
Since electric current meeting of the circuit in startup stage, circuit is there are one the fluctuation phase, the unstable of electric current may result in
Fault detection circuit is mistaken for DC fan failure.In order to solve this problem, optionally, as shown in Fig. 2, fault judging circuit 13
In further include pull-up circuit 134, the input terminal of pull-up circuit 134 is connected with the output terminal of logical AND gate circuit 133, pull-up circuit
134 output terminal is connected with external circuit interface (not shown)；Pull-up circuit 134 is used under predetermined condition, by logical AND gate
The 3rd comparative result that circuit 133 exports is arranged to high level, and the high level output is given to the interface of the external circuit.
Wherein, the high level is used to indicate DC fan and is in non-faulting state, and the predetermined condition includes circuit in startup stage
The unstable situation of caused electric current.
In the present embodiment, by increasing pull-up circuit 134 in fault judging circuit 13, avoid since circuit is starting
The situation of DC fan failure is mistaken for caused by the current fluctuation in stage, so as to further improve the inspection of the failure of DC fan
Survey accuracy rate.
In above-described embodiment, the first comparison circuit 131, the second comparison circuit 132, logical AND gate in fault judging circuit 13
Circuit 133, pull-up circuit 134, first threshold set circuit 135 and second threshold sets circuit 136, and common base can be selected
Plinth chip is realized, and is patch encapsulation so that fault detection circuit 10 occupies little space, at low cost, and circuit is simple,
For ease of maintenaince, so as to solving the problems, such as that the applicability being detected to electric current using current sensor in the prior art is low.
Fig. 3 is the structure diagram of DC fan fault detection circuit embodiment three provided by the utility model, such as Fig. 3 institutes
Show, shown in Fig. 1 on the basis of embodiment, DC fan fault detection circuit 10 provided in this embodiment, further include optocoupler every
From circuit 14, the primary side of optical coupling isolation circuit 14 is connected with fault judging circuit 13, secondary and the outside of optical coupling isolation circuit 14
Circuit interface (not shown) connects, and optical coupling isolation circuit 14 is used for the DC fan fault detect for exporting fault judging circuit 13
As a result export to external circuit.
In the present embodiment, by increasing optical coupling isolation circuit between DC fan fault detection circuit 10 and external circuit
14 so that there is no being directly connected to for electricity between DC fan fault detection circuit 10 and external circuit, so as to avoid direct current wind
Machine fault detection circuit 10 is disturbed be subject to external circuit, improves the anti-interference of DC fan fault detection circuit 10.
Optionally, DC fan fault detection circuit 10 in the present embodiment, further includes current foldback circuit 15, overcurrent protection
The input terminal of circuit 15 is connected with DC fan (not shown), the output terminal of current foldback circuit 15 and the input of sample circuit 11
End connection.
It should be understood that current foldback circuit 15 can be herein not specifically limited there are many way of realization.Optionally,
Current foldback circuit 15 includes fuse (not shown), and the fuse is used for when detecting that electric current is more than preset value, with this
The heat of body makes its fusing, so that circuit disconnects, other elements in circuit is protected not to be damaged.
It should be noted that the electric current preset value set in current foldback circuit 15, compared in fault judging circuit 13
The corresponding current upper limit value of first threshold is high, specifically, the corresponding current upper limit value of first threshold in fault secure circuit 13
It is used to indicate DC fan after reaching the upper limit value and will be unable to good work, the electric current set in current foldback circuit 15 is preset
Value is used to indicate reach the preset value after circuit will be caused to damage.
In the present embodiment, by increasing current foldback circuit 15 in DC fan fault detection circuit 10 so that failure
Detection circuit 10, can be by 15 circuit breaker of current foldback circuit, so as to protect fault detect electric under overcurrent condition
Other elements in road 10 are without damage, improve the security of DC fan fault detection circuit 10.
In order to further improve the fault detect accuracy rate of DC fan, optionally, sample circuit 11 is additionally operable to direct current
The current signal of wind turbine is filtered.It should be noted that filtering method is not specifically limited.
It should be understood that since the possibility of DC fan output is the current signal of fluctuation, pass through the electric current to the fluctuation
Signal is filtered, so that it becomes smooth current signal, electricity is carried out using sample circuit 11 to the smooth current signal
Pressure conversion, can eliminate the erroneous judgement brought due to current fluctuation, so as to improve the fault detect accuracy rate of DC fan.
In above-described embodiment, due to sample circuit 11, amplifying circuit 12, fault judging circuit 13, optical coupling isolation circuit 14
With current foldback circuit 15, common base chip can be selected and realize, and be patch encapsulation so that DC fan failure
Detection circuit 10 occupies little space, at low cost, and circuit is simple, for ease of maintenaince, so as to solve in the prior art using electricity
The problem of applicability that flow sensor is detected DC fan electric current is low.
Fig. 4 is the structure chart of DC fan system embodiment provided by the utility model, as shown in figure 4, the present embodiment carries
The DC fan system 30 of confession includes：DC fan 20 and DC fan fault detection circuit 10, wherein, the inspection of DC fan failure
Slowdown monitoring circuit 10 may be employed such as the structure of Fig. 1-Fig. 3 any embodiments, corresponding, can perform Fig. 1-Fig. 3 any embodiments
Technical solution, implementing principle and technical effect are similar, and details are not described herein again.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, those of ordinary skill in the art should
Understand：It can still modify to the technical solution recorded in foregoing embodiments either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is not made to depart from this practicality newly
The scope of each embodiment technical solution of type.
Claims (10)
1. a kind of fault detection circuit of DC fan, which is characterized in that including：Sample circuit, amplifying circuit and breakdown judge
Circuit；
The sample circuit, the amplifying circuit and the fault judging circuit are sequentially connected in series；
The sample circuit, for the current signal of the DC fan to be converted to first voltage signal, and by described first
Voltage signal is exported to the amplifying circuit；
The amplifying circuit for carrying out the amplification of preset multiple to the first voltage signal, obtains second voltage signal, and
Give the second voltage signal output to the fault judging circuit；
The fault judging circuit, for according to the second voltage signal and default first threshold and second threshold, sentencing
The DC fan that breaks whether failure, and will determine that result is exported to the interface of external circuit.
2. circuit according to claim 1, which is characterized in that
The fault judging circuit includes：First comparison circuit, the second comparison circuit and logical AND gate circuit, described first compares
After circuit and the second comparison circuit parallel connection with the logical AND gate circuit connected in series；
First comparison circuit, for the second voltage signal compared with the default first threshold, to be obtained
First comparative result, and first comparative result is exported to the logical AND gate circuit；
Second comparison circuit, for the second voltage signal compared with the default second threshold, to be obtained
Second comparative result, and second comparative result is exported to the logical AND gate circuit；
The logical AND gate circuit, for first comparative result and second comparative result to be carried out logic and operation,
The 3rd comparative result is obtained, and the 3rd comparative result is exported to the interface of the external circuit.
3. circuit according to claim 2, which is characterized in that the fault judging circuit further includes pull-up circuit, described
Pull-up circuit is connected with the logical AND gate circuit；
The pull-up circuit, under predetermined condition, the 3rd comparative result of the logical AND gate circuit output to be set
High level is set to, and the high level output is given to the interface of the external circuit, wherein, the high level is used to indicate direct current
Wind turbine is in non-faulting state.
4. according to claim 1-3 any one of them circuits, which is characterized in that further include optical coupling isolation circuit, the optocoupler
The primary side of isolation circuit is connected with the fault judging circuit, and the secondary of the optical coupling isolation circuit connects with the external circuit
It connects.
5. circuit according to claim 1, which is characterized in that further include current foldback circuit, the current foldback circuit
Input terminal be connected with DC fan, the output terminal of the current foldback circuit is connected with the sample circuit.
6. circuit according to claim 1, which is characterized in that
The sample circuit is additionally operable to be filtered the current signal of the DC fan.
7. circuit according to claim 2, which is characterized in that the fault judging circuit further includes：First threshold is set
Circuit and second threshold set circuit, and the first threshold sets circuit to be connected with first comparison circuit, second threshold
Value sets circuit to be connected with second comparison circuit；
The first threshold sets circuit for setting the first threshold；
The second threshold sets circuit for setting the second threshold.
8. circuit according to claim 2, which is characterized in that
First comparison circuit, if being more than the first threshold specifically for the second voltage signal, to the logic
AND gate circuit exports low level, otherwise, to the logical AND gate circuit output high level；
Second comparison circuit, if being less than the second threshold specifically for the second voltage signal, to the logic
AND gate circuit exports low level, otherwise, to the logical AND gate circuit output high level；
Wherein, the low level is used to indicate the DC fan and is in malfunction, and the high level is used to indicate described straight
Flow fan is in non-faulting state.
9. circuit according to claim 5, which is characterized in that the current foldback circuit includes fuse.
10. a kind of DC fan system, which is characterized in that including DC fan and as claim 1-9 any one of them is straight
The fault detection circuit of flow fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721469866.2U CN207424135U (en) | 2017-11-07 | 2017-11-07 | The fault detection circuit of DC fan and DC fan system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721469866.2U CN207424135U (en) | 2017-11-07 | 2017-11-07 | The fault detection circuit of DC fan and DC fan system |
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| Publication Number | Publication Date |
|---|---|
| CN207424135U true CN207424135U (en) | 2018-05-29 |
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| CN201721469866.2U Active CN207424135U (en) | 2017-11-07 | 2017-11-07 | The fault detection circuit of DC fan and DC fan system |
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| Country | Link |
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| CN (1) | CN207424135U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807292A (en) * | 2017-11-07 | 2018-03-16 | 中车大连电力牵引研发中心有限公司 | The failure detector circuit and DC fan system of DC fan |
| CN108957219A (en) * | 2018-06-14 | 2018-12-07 | 山东卓尔电气有限公司 | A kind of fuse switch on-line fault monitoring method and device |
-
2017
- 2017-11-07 CN CN201721469866.2U patent/CN207424135U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807292A (en) * | 2017-11-07 | 2018-03-16 | 中车大连电力牵引研发中心有限公司 | The failure detector circuit and DC fan system of DC fan |
| CN108957219A (en) * | 2018-06-14 | 2018-12-07 | 山东卓尔电气有限公司 | A kind of fuse switch on-line fault monitoring method and device |
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