CN106385007A - Protection method and device for the power supply control module of direct-current fan - Google Patents
Protection method and device for the power supply control module of direct-current fan Download PDFInfo
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- CN106385007A CN106385007A CN201610851366.9A CN201610851366A CN106385007A CN 106385007 A CN106385007 A CN 106385007A CN 201610851366 A CN201610851366 A CN 201610851366A CN 106385007 A CN106385007 A CN 106385007A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0811—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for dc motors
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- Control Of Direct Current Motors (AREA)
Abstract
The present invention discloses a protection method and device for the power supply control module of a direct-current fan. The method includes the following steps that: the rotation speed of the direct-current fan is obtained according to a first preset frequency; the number of the times of the occurring of a condition that the difference value of rotation speed obtained last time and the rotation speed obtained currently is larger than a first preset value in a preset time period is calculated and is set to a first counting value; and when the first counting value is larger than a set value, the input control signals of the power supply control module are cut off, so that no power is supplied inside the power supply control module. With the protection method and device provided by the technical schemes of the invention adopted, phase current outputted by the power supply control module can be short-circuited, and therefore, when over-current occurs on the direct-current fan, and the direct-current fan is powered down, and the control signals of a single-chip microcomputer are cut off automatically before the fan stops rotating, and the power supply control module can be protected.
Description
Technical field
The present invention relates to current protection technology, especially a kind of DC fan power control module guard method and device.
Background technology
In existing DC frequency-changing blower fan technology, the rotating speed of the blower fan according to acquisition for the single-chip microcomputer, indoor temperature, outdoor temperature
Etc. parameter output control signal to power control module, by controlling the phase current of power control module output, thus controlling wind
The rotating speed of machine.As long as it is that rotation speed of fan is not zero that blower fan is in rotary state, single-chip microcomputer will output control signal, power supply control
The phase current of module output is just not zero.
When being short-circuited between the phase current of DC fan power control module output, supply current increases, and reaches
To overcurrent protection setting threshold value when, automatically cut off the power supply powered to DC fan, at this moment blower fan can run one due to inertia
The section time just can be out of service.
Within this period that blower fan inertia runs, because rotation speed of fan is not zero, now single-chip microcomputer also can be according to blower fan
Rotating speed inputs control signal to power control module, still has electric current to flow through, power control module is defeated inside power control module
Go out the overlong time that short circuit occurs between phase and phase, DC fan power control module itself can be led to damage.
Content of the invention
The main object of the present invention is to provide a kind of DC fan power control module guard method and device it is intended to extend
The service life of DC fan power control module.
For achieving the above object, DC fan power control module guard method proposed by the present invention, comprises the following steps：
Obtain the rotating speed of DC fan according to the first predeterminated frequency；
The difference counting between the rotating speed once obtaining in preset time period and the current rotating speed obtaining is more than first
The number of times of preset value, and it is set to the first count value；
When the first count value is more than setting value, close the input control signal of power control module, so that power supply control
Inside modules power-off.
Preferably, described DC fan power control module guard method also includes：
When getting the current rotating speed of described DC fan, the size adjustment output according to described rotating speed is to described power supply
The input control signal of control module, so that described power control module is correspondingly sized according to described input control signal output
Supply voltage is to described DC fan；
The described input control signal closing power control module is specially：The rotating speed of the DC fan of acquisition is set to
0.
Preferably, close the input control signal of power control module described when the first count value is more than setting value,
To stop also including before making the internal power-off of power control module to described power control module output control signal：
In the initial time section of described preset time period, when the difference of rotating speed of target and the rotating speed of described DC fan is more than
During the second preset value, Jia 1 to described first count value, and described rotating speed of target is reduced the 3rd preset value；
After the initial time section of described preset time period, little with the difference of the rotating speed of described DC fan in rotating speed of target
In or be equal to the second preset value when, according to the rotating speed of current goal rotating speed and the DC fan getting, current goal is turned
Quick-recovery is the rotating speed of target not reduced before the 3rd preset value.
Preferably, described by described rotating speed of target reduction the 3rd preset value include：
Described rotating speed of target is gradually reduced, the amount sum reducing every time is described 3rd preset value.
Preferably, the described rotating speed of target reverting to current goal rotating speed before not reducing the 3rd preset value includes：
When the rotating speed of current goal rotating speed and DC fan is all higher than six preset values, current goal rotating speed is with described
Six preset values are radix, are gradually incremented by and recover to the described rotating speed of target not reduced before the 3rd preset value；Turn in current goal
When speed is less than six preset values more than the current rotating speed of the 6th preset value and DC fan, directly current goal rotating speed is set to
6th preset value；
Current goal rotating speed and DC fan rotating speed all between when between the 6th preset value and the 7th preset value, currently
Rotating speed of target, with described 7th preset value as radix, is gradually incremented by the described target recovered to before do not reduce the 3rd preset value and turns
Speed；Current goal rotating speed between the 6th preset value and the 7th preset value and DC fan rotating speed be less than the 7th preset value
When, directly current goal rotating speed is set to the 7th preset value；
When current goal rotating speed is less than seven preset values；Directly current goal rotating speed is set to not reduce the 3rd and presets
Rotating speed of target before value；
Wherein said 6th preset value is more than the 7th preset value.
For achieving the above object, the present invention also provides a kind of DC fan power control module protection device, including：
Acquisition module, for obtaining the rotating speed of DC fan according to the first predeterminated frequency；
First counting module, for counting the rotating speed once obtaining in preset time period and the current rotating speed obtaining
Difference is more than the number of times of the first preset value, and is set to the first count value；
Controller, for when the first count value is more than setting value, cutting out the input control signal of supply module；So that supplying
The internal power-off of electric control module.
Preferably, described controller, is additionally operable to when getting the current rotating speed of described DC fan, according to described rotating speed
Size adjustment output to described power control module input control signal, so that described power control module is according to described defeated
Enter the correspondingly sized supply voltage of control signal output to described DC fan；
When the first count value is more than setting value, the rotating speed of the DC fan of acquisition is set to 0；So that power supply control mould
The internal power-off of block.
Preferably, described DC fan power control module protection device also includes：
Second counting module, in the initial time section of preset time period, in rotating speed of target and described DC fan
The difference of rotating speed when being more than the second preset value, Jia 1 to described first count value, and will be the 3rd pre- for the reduction of described rotating speed of target
If value；
Recovery module, for after the initial time section of preset time period, in rotating speed of target and described DC fan
When the difference of rotating speed is less than or equal to the second preset value, according to the rotating speed of current goal rotating speed and the DC fan getting, will
Current goal rotating speed reverts to the rotating speed of target not reduced before the 3rd preset value.
Preferably, described second counting module, is additionally operable to gradually reduce described rotating speed of target, the amount sum reducing every time
For described 3rd preset value.
Preferably, described recovery module includes：
First recovery module, when being all higher than six preset values for the rotating speed in current goal rotating speed and DC fan, when
Front rotating speed of target, with described 6th preset value as radix, is gradually incremented by and recovers to the described target not reduced before the 3rd preset value
Rotating speed；When the rotating speed being more than the 6th preset value and DC fan in current goal rotating speed is less than six preset values, directly will be currently
Rotating speed of target is set to the 6th preset value；
Second recovery module, for current goal rotating speed and DC fan rotating speed between the 6th preset value with more than the
When between seven preset values, current goal rotating speed, with described 7th preset value as radix, is gradually incremented by and recovers pre- to not reducing the 3rd
If the described rotating speed of target before value；In current goal rotating speed between the 6th preset value and the 7th preset value and DC fan
Rotating speed be less than seven preset values when, directly current goal rotating speed is set to the 7th preset value；
3rd recovery module, for when current goal rotating speed is less than seven preset values；Directly current goal rotating speed is set
It is set to the rotating speed of target not reduced before the 3rd preset value；
Wherein said 6th preset value is more than the 7th preset value.
In technical solution of the present invention, when being short-circuited between the phase current of DC fan power control module output, supply
Electric current increases, reach overcurrent protection setting threshold value when, automatically cut off to DC fan power supply, at this moment blower fan by
In inertia meeting continuous service, but rotating speed can drastically decline, and pass through to detect the rotating speed of DC fan, and set properly in this programme
Parameter, when the rotating speed of DC fan is sampled according to the first predeterminated frequency, when descent amplitude is more than the first preset value, at this moment carry out
Count, when counting reaches setting value, can determine that DC fan is in off-position, because inertia remains on, close control
Signal processed, when power control module does not have control signal input, terminates outwards exporting, phase current is zero, and now the turning of blower fan
Speed does not also decelerate to zero, also needs to a period of time in other words and just can stop operating, actual shortens power supply control with respect to existing
The time of the short circuit between phase and phase of module, thus protect DC fan power control module damaged.
Brief description
Fig. 1 is the flow chart of DC fan power control module guard method embodiment one of the present invention；
Fig. 2 is the flow chart of DC fan power control module guard method embodiment two of the present invention；
Fig. 3 is the flow chart of DC fan power control module guard method embodiment three of the present invention；
Fig. 4 is the refinement stream reducing rotating speed of target in DC fan power control module guard method example IV of the present invention
The flow chart of journey；
Fig. 5 is DC fan power control module guard method embodiment five of the present invention and the refinement stream recovering rotating speed of target
Cheng Tu；
Fig. 6 is the module frame figure of DC fan power control module protection device embodiment one of the present invention；
Fig. 7 is the module frame figure of DC fan power control module protection device embodiment two of the present invention.
The realization of the object of the invention, functional characteristics and advantage will be described further in conjunction with the embodiments referring to the drawings.
Specific embodiment
It should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The present invention proposes a kind of DC fan power control module guard method.
Embodiment one
Refer to Fig. 1, in an embodiment of the present invention, this DC fan power control module guard method, including following
Step：
Step S1, according to the first predeterminated frequency f1Obtain the current rotating speed R of DC fani；
After a loss of power, due to inertia and air drag, rotating speed is in nonlinear change to blower fan, in incipient a period of time,
Rotating speed drastically declines, after a period of time region gentle, the scheme of the application is within the above shorter time according to predeterminated frequency
By obtaining the amplitude that rotating speed declines, to judge whether blower fan is in the state of inertia rotation after above-mentioned power-off, such as f here1
=100Hz, then per second interior sampling 100 times, the current rotating speed of DC fan is followed successively by R1、R2、R3……R100.
Step S2, counts the rotating speed R once obtaining in preset time periodi-1With the current rotating speed R obtainingiBetween
Difference is more than the first preset value P1Number of times, and be set to the first count value；
Assume that the rotating speed of DC fan is per second and decline 100 turns, regard as blower fan and be in the inertia rotary state after power-off, then
Here the first predeterminated frequency f1=1Hz, the first preset value P1=100；Here parameter can be obtained by experiment, with direct current wind
The characteristic of machine itself the such as relating to parameters such as supply voltage, load, actual speed system, is set according to different fan parameters
Put, according to the first predeterminated frequency f1Sampling is compared, if meeting condition：Ri-1-Ri>P1, just once counted.Wherein last
Rotating speed is Ri-1, current rotating speed is Ri.
Pass through a relatively front rotating speed R in an embodiment of the present inventioni-1With current rotating speed RiDifference be more than the first preset value
P1Number of times, as judging whether blower fan is in the standard of the state that inertia after above-mentioned power-off rotates, such as the first preset value P1=
100, then work as R1-R2When=105, count 1, work as R3-R4When=110, count 2；The like.
Step S5, when the first count value reaches setting value N1When, close the input control signal of power control module, so that
The internal power-off of power control module.
Here using count results as control condition, if the count results in step S2 reach N1Then it is assumed that enough energy
Determine blower fan power-off, and due to inertia rotate, at this moment then can close the input control signal of power control module so that
Power control module stops output, and that is, output current phase is zero, and output phase and phase short circuit does not interfere with power control module, so
Just power control module can be protected before blower fan stops operating, without just right after blower fan stops operating
Power control module is protected, and with respect to prior art, substantially reduces power control module output short circuit between phase and phase
State, thus play the effect of timely protection.
Embodiment two
With reference to Fig. 2, as the preferred version of above-described embodiment one, methods described also includes：
Step S6, when getting the current rotating speed of described DC fan, the size adjustment output according to described rotating speed is extremely
The input control signal of described power control module, so that described power control module is according to described input control signal output phase
The supply voltage answering size is to described DC fan；
In step S5, the input control signal closing power control module is specially：Rotating speed by the DC fan obtaining
It is set to 0.
Such as setting value N1=100, above-mentioned count results are 100, then by the current rotating speed R of the DC fan obtaining100
Be revised as zero, need exist for illustrating, above the current rotating speed R of DC fan that obtains every timeiAll it is not zero, even if in meter
In the case that number results reach setting value, also it is not zero, R for example here100Also it is not zero, is revised as zero here, be by journey
Sequence gives R by zero100.
Here controller can be single-chip microcomputer, single-chip microcomputer output control signal to power control module, control here
Signal can be pulse control signal PWM, and pulse control signal PWM here is the current rotating speed according to the DC fan obtaining
Exported, in the current rotating speed R of DC faniWhen being not zero, pulse control signal PWM all can be had all the time to export to power supply
Control module, in order to protect the power control module being in short-circuit condition, needs to break pulse control signal PWM immediately, this
In by the way confirm DC fan power-off in the case of by obtain DC fan current rotating speed RiIt is revised as zero,
Now, controller is in the current rotating speed R of DC faniIn the case of being zero, directly close pulse control signal PWM, mould of powering
Block does not have input signal, does not naturally have output, so that the power control module being in short-circuit condition obtains protection.
Embodiment three
Refer to Fig. 3, in an alternative embodiment of the invention, this DC fan power control module guard method, including with
Lower step：
Step S3, in initial time section T of described preset time period, when the rotating speed of rotating speed of target and described DC fan
RiDifference be more than the second preset value when, Jia 1 to described first count value, and by described rotating speed of target reduction the 3rd preset value
P3；
In the application one embodiment, initial time section T is 60 seconds, the current rotating speed R of DC faniAccording to predeterminated frequency
Obtained it is assumed that per second obtain 3 sampled datas, the second preset value P2Take 200, then in R1-R0<When -200, secondary counting 1,
At this moment by rotating speed of target R0Reduce the 3rd preset value P3, obtaining R2Before, the supply voltage of power control module is recovered,
Now, be equivalent to the load reduction of blower fan, the rotating speed of blower fan declines therewith, for example, rotating speed of target R0Reduce 150 turns afterwards,
The rotating speed of blower fan have dropped 100 turns, then R2-R0'=R1--100-(R0- 150)=R1-R0+ 50, may be unsatisfactory for<200 bar
Part, at this moment shows that the adjustment numerical value of rotating speed of target is suitable, secondary counting result will not increase, then carries out below step
S4；If in rotating speed of target R0Reduce 150 turns afterwards, the rotating speed of blower fan have dropped 155 turns, then R2-R0'=R1--155-(R0-
150)=R1-R0- 5, due to R1-R0<- 200, then R1-R0-5<- 200, now, show that the adjustment numerical value of rotating speed of target is improper
, secondary counting result continues to increase, when reaching setting value, execution step S5, S6, and cut off the control of power control module in time
Signal.
Step S4, after initial time section T of described preset time period, in rotating speed of target R0With described DC fan
Rotating speed RiDifference be less than or equal to the second preset value P2When, according to current goal rotating speed R0And the rotating speed R of DC fani, ought
Front rotating speed of target (R0-P3) revert to and do not reduce the 3rd preset value P3Rotating speed of target R before0.
Suitable in the adjustment numerical value of above-mentioned rotating speed of target, in the case that secondary counting result will not increase, in order to not affect
The normal operation of blower fan is in addition it is also necessary to recover rotating speed of target to original value, in an embodiment of the present invention, in order to not affect wind
The excessively stream of machine, takes the mode gradually recovered, for example per second increase by 10 turns.
It is to be understood that being to enter in the time period T of overcurrent protection state in power control module, work as rotating speed of target
R0Current rotating speed R with described DC faniDifference be more than the second preset value P2When, count again.It should be noted that here
Rotating speed of target R0It is set in program, have direct pass with the power supply parameter of motor of DC fan itself and load etc.
System, if blower fan runs well, rotating speed is not up to rotating speed of target R0, when the rotating speed of blower fan reaches rotating speed of target R0When it is meant that
Load is led to increase because motor temperature rises the reason such as high, now power control module will be according to rotating speed of target R0Automatically reduce
The output of supply voltage, forces rotation speed of fan to reduce, subsequently automatically replies normal supply voltage.When load is not reduced to
In the case of normal value, as long as supply voltage recovers, the rotating speed of blower fan also can rise, as long as reaching rotating speed of target, equally can touch
The on-off circuit of dynamic power control module, reduces the output of supply voltage automatically, forces rotation speed of fan to reduce, and so repeatedly, supplies
The on-off circuit of electric control module frequently cut-offs, and can greatly shorten its service life.
To sum up, this programme, by above measure, will automatically reduce the output of supply voltage in power control module
Meanwhile, by detecting current rotating speed R according to preset frequencyiWith rotating speed of target R during reducing0Gap (i.e. R0-Ri), and
By this gap and the second preset value P2Relatively, if the former is more than the latter, count again, hereafter, by preset time period
Interior by reduce rotating speed of target R0Numerical value, reduce secondary counting the frequency, simultaneously power control module will according to reduce after
Rotating speed of target control the current rotating speed of blower fan, and slowly recover rotating speed of target after preset time period, this process is suitable
In reduce fans load, more slowly increase load, reduce supply voltage after, for the previous period interior reduce blower fan turn
Speed, if can be reduced to one by the current rotating speed of blower fan in this way after power control module restores electricity voltage
Suitable scope, then secondary counting result will not increase, then slowly recover again, then power control module being capable of normal work；
If by way of above-mentioned reduction rotating speed of target after power control module restores electricity voltage, the rotating speed of blower fan drastically under
Fall, then the frequency rising of secondary counting, when reaching setting value, controller may turn off the input of control signal, power supply control
Module does not have control signal to input, and stops powering to blower fan.
The second preset value P in this programme one embodiment2Take 200 it is understood that being, the process that current rotating speed reduces
In, when falling below 200 turns of rotating speed of target, enumerator is counted again, the counting in counting here and step S2
Do not conflict, when respective condition meets, counted respectively.
Exist with the difference of embodiment one, the decline of the rotating speed of blower fan here is because overload leads to supply module to drop
The output of low suppling voltage leads to, and not judges the condition that the inertia after blower fan power-off rotates, the first preset value P1It is basis
The design parameter of the supply voltage that power control module reduces carries out testing acquisition.
Step S5, when counting reaches setting value N1When, by the current rotating speed R of the DC fan obtainingiIt is set to zero, so that
The internal power-off of power control module；
The adjustment to rotating speed of target in step S3, power control module supply voltage recover after, blower fan turn
Prompt drop low amplitude value is excessive, then the secondary counting result in step S3 can increase, when reaching setting value, the direct current wind that modification obtains
The current rotating speed R of machineiIt is zero.Controller is in the current rotating speed R of the DC fan obtainingiWhen being zero, close power control module
Input control signal.
Step S6, when getting the current rotating speed of described DC fan, the size adjustment output according to described rotating speed is extremely
The input control signal of described power control module, so that described power control module is according to described input control signal output phase
The supply voltage answering size is to described DC fan.
Controller is in the current rotating speed R of the DC fan obtainingiIn the case of being arranged to zero, directly close Pulse Width Control
Signal PWM, supply module does not have input signal, does not have output, so that power control module obtains protection.When adjustment
When rotating speed of target is incorrect, by this kind of mode, power control module is protected；If the rotating speed of target of adjustment is appropriate,
Power control module can recover normal, and need not be through step S5 and step S6.
Example IV
Referring to Fig. 4, in step S3, by described rotating speed of target R0Reduce the 3rd preset value P3It is specially：By described rotating speed of target
R0Gradually reduce, the amount sum reducing every time is described 3rd preset value P3.
Here the mode of reduction rotating speed of target is specifically carried out by the way of being gradually lowered stage by stage, and step S3 includes：
Step S3A, in the first sub- time period t1 of initial time section T, by described rotating speed of target R0Reduce the 4th to preset
Value P4；
In one embodiment, preset time period T is 60 seconds, and the first sub- time period t1 takes 0～30 second, then in power supply control mould
In first 30 seconds after block entrance overcurrent protection state, as rotating speed of target R0Current rotating speed R with described DC faniDifference be more than the
Two preset value P2When (such as 100 turns), while starting secondary counting, by rotating speed of target R0Reduce the 4th preset value P4；After reduction
Current rotating speed of target is：R0-P4；I.e. Rule of judgment (current goal rotating speed R0Current rotating speed R with described DC faniDifference
More than the second preset value P2) when whether meeting it should be to judge：Ri-(R0-P4) whether<-200.The sampling of the current rotating speed of blower fan
Continue according to sample frequency, if after turning down to rotating speed of target according to above-mentioned 100 turns, the current rotating speed of blower fan reduces
101, above-mentioned condition meets, then carry out secondary counting, this explanation is less to the adjustment amplitude of rotating speed of target, needs more than 30 seconds
Afterwards, carry out below step S21B；If being unsatisfactory for above-mentioned condition to meet, prove that the rotating speed of target adjusting is suitable, energy
Enough rotating speeds suitably reducing blower fan, need not carry out below step S21B.
Step S3B, in the second sub- time period t2 of initial time section T, will reduce the 4th preset value P4Target afterwards turns
Fast (R0-P4) reduce the 5th preset value P again5；First sub- time period t1 and the second sub- time period t1 sum are equal to preset time period
T, the 4th preset value P4With the 5th preset value P5Sum is equal to the 3rd preset value P3；
In one embodiment, the second sub- time period t2 takes 30～60 seconds, then enter overcurrent protection shape in power control module
In latter 30 seconds of state, the 4th preset value P will be reduced4Rotating speed of target (R afterwards0-P4) reduce the 5th preset value P again5；After reduction
Current rotating speed of target is：R0-P4-P5；I.e. Rule of judgment (current goal rotating speed R0Current rotating speed R with described DC faniIt
Difference is more than the second preset value P2) when whether meeting it should be to judge：Ri-(R0-P4-P5) whether<- 200, if be unsatisfactory for, demonstrate,prove
The rotating speed of target of bright adjustment is suitable, can suitably reduce the rotating speed of blower fan；If or meet, can continue to reduce again
Rotating speed of target, or when the amplitude that first time selects reduction is larger, executable step 23.
This programme essentially consists in and prevents once the range-adjusting of the reduction of rotating speed of target is too big, directly cuts off to blower fan
Power supply it is impossible to the normal operation of the control module that restores electricity, can by way of gradually small magnitude adjustment using this programme
Improve the normal probability run of the control module that restores electricity, improve recovery rate.
Embodiment five
Referring to Fig. 5, if power control module recovers normal run, three kind reset modes are provided below, step 4 includes：
Step S4A, in current goal rotating speed (R0-P3) and DC fan current rotating speed RiIt is all higher than the 6th preset value P6
When, current goal rotating speed (R0-P3) with the 6th preset value P6For radix, according to the second predeterminated frequency f2The mode being gradually incremented by is extensive
Multiple to not reducing the 3rd preset value P3Described rotating speed of target R before0；In current goal rotating speed (R0-P3) it is more than the 6th preset value
P6And the current rotating speed R of DC faniLess than the 6th preset value P6When, directly by current goal rotating speed (R0-P3) it is set to the 6th
Preset value P6；
The increment being wherein incremented by takes 10 revolutions per seconds for △ P；3rd preset value P3Take 150, the 6th preset value P6Take 900, in mesh
In the case that mark rotating speed is higher than 900 revolutions per seconds；And current rotating speed is higher than 900 turns, or when current rotating speed is higher than 880 turns, target
Rotating speed temporary variable switchs to basis with 900, per second plus 10 turns, until returning to original rotating speed of target, for example original target
Rotating speed is 1500 turns, then need to revert to 1500 turns；When current rotating speed is less than 880 turns, rotating speed of target temporary variable is 900 turns.
Step S4B, in current goal rotating speed (R0-P3) and DC fan current rotating speed RiAll between the 6th preset value P6
With the 7th preset value P7Between when, current goal rotating speed (R0-P3) with the 7th preset value P7For radix, according to the second predeterminated frequency f2
The mode being gradually incremented by is recovered to not reducing the 3rd preset value P3Rotating speed of target R before0；In current goal rotating speed (R0-P3) be situated between
In the 6th preset value P6With the 7th preset value P7Between and DC fan current rotating speed RiLess than the 7th preset value P7When, directly
By current goal rotating speed (R0-P3) it is set to the 7th preset value P7；
The increment being wherein incremented by takes 10 revolutions per seconds for △ P；7th preset value P7Take 600；It it is higher than 600 turns in rotating speed of target
In the case of, current rotating speed is higher than 600 turns, or when current rotating speed is higher than 580 turns, rotating speed of target temporary variable switchs to base with 600
Plinth is per second to add 10 turns；Current rotating speed is less than 580 turns, and rotating speed of target temporary variable is 600 turns.
Step S4C, in current goal rotating speed (R0-P3) it is less than the 7th preset value P7In the case of；Directly current goal is turned
Fast (R0-P3) be set to not reduce the 3rd preset value P3Rotating speed of target R before0；Wherein said 6th preset value P6More than the 7th
Preset value P7.
When current goal rotating speed is less than 600 turns, directly reverts to and do not reduce the 3rd preset value P3Rotating speed of target R before0.
The present invention proposes a kind of DC fan power control module protection device.
Embodiment one
Referring to Fig. 6, in an embodiment of the present invention, this DC fan power control module protection device includes acquisition module
1st, the first counting module 2 and controller 3, wherein：
Acquisition module 1, for according to the first predeterminated frequency f1Obtain the current rotating speed R of DC fani；
After a loss of power, due to inertia and air drag, rotating speed is in nonlinear change to blower fan, in incipient a period of time,
Rotating speed drastically declines, after a period of time region gentle, the scheme of the application is within the above shorter time according to predeterminated frequency
By obtaining the amplitude that rotating speed declines, to judge whether blower fan is in the state of inertia rotation after above-mentioned power-off, such as f here1
=100Hz, then per second interior sampling 100 times, the current rotating speed of DC fan is followed successively by R1、R2、R3……R100.
First counting module 2, for counting the rotating speed R once obtaining in preset time periodi-1With turning of current acquisition
Fast RiDifference be more than the first preset value P1Number of times, and be set to the first count value；
Assume that the rotating speed of DC fan is per second and decline 100 turns, regard as blower fan and be in the inertia rotary state after power-off, then
Here the first predeterminated frequency f1=1Hz, the first preset value P1=100；Here parameter can be obtained by experiment, with direct current wind
The characteristic of machine itself the such as relating to parameters such as supply voltage, load, actual speed system, is set according to different fan parameters
Put, according to the first predeterminated frequency f1Sampling is compared, if meeting condition：Ri-1-Ri>P1, just once counted.Wherein front once
Rotating speed is Ri-1, current rotating speed is Ri.
Pass through a relatively front rotating speed R in an embodiment of the present inventioni-1With current rotating speed RiDifference be more than the first preset value
P1Number of times, as judging whether blower fan is in the standard of the state that inertia after above-mentioned power-off rotates, such as the first preset value P1=
100, then work as R1-R2When=105, count 1, work as R3-R4When=110, count 2；The like.
For reaching setting value N in the first count value1When, close the input control signal of power control module, so that supplying
The internal power-off of electric control module.
Here using count results as control condition, if the first count value reaches N1Then it is assumed that can determine that blower fan enough
Power-off, and because inertia rotates, the input control signal of power control module at this moment then can be closed so that power supply control
Module stops output, and that is, output current phase is zero, and output phase and phase short circuit does not interfere with power control module, so can be in wind
Machine just can be protected to power control module before stopping operating, without ability after blower fan stops operating to power supply control
Module is protected, and with respect to prior art, substantially reduces power control module output short-circuit condition between phase and phase, thus
Play the effect of timely protection.
Described controller 3, is additionally operable to when getting the current rotating speed of described DC fan, according to the size of described rotating speed
The input control signal of adjustment output extremely described power control module, so that described power control module controls according to described input
The correspondingly sized supply voltage of signal output is to described DC fan；
It is more than setting value N in the first count value1When, the rotating speed of the DC fan of acquisition is set to 0；So that power supply control
Inside modules power-off.
Such as setting value N1=100, above-mentioned count results are 100, then by the current rotating speed R of the DC fan obtaining100
Be revised as zero, need exist for illustrating, above the current rotating speed R of DC fan that obtains every timeiAll it is not zero, even if in meter
In the case that number results reach setting value, also it is not zero, R for example here100Also it is not zero, is revised as zero here, be by journey
Sequence gives R by zero100.
Here controller can be single-chip microcomputer, single-chip microcomputer output control signal to power control module, control here
Signal can be pulse control signal PWM, and pulse control signal PWM here is the current rotating speed according to the DC fan obtaining
Exported, in the current rotating speed R of DC faniWhen being not zero, pulse control signal PWM all can be had all the time to export to power supply
Control module, in order to protect the power control module being in short-circuit condition, needs to break pulse control signal PWM immediately, this
In by the way confirm DC fan power-off in the case of by obtain DC fan current rotating speed RiIt is revised as zero,
Now, controller is in the current rotating speed R of DC faniIn the case of being zero, directly close pulse control signal PWM, mould of powering
Block does not have input signal, does not naturally have output, so that the power control module being in short-circuit condition obtains protection.
Embodiment two
In an alternative embodiment of the invention, referring to Fig. 7：
Controller 3 also includes：
Second counting module 31, in initial time section T of preset time period, in rotating speed of target R0With described direct current
The rotating speed R of blower faniDifference be more than the second preset value P2When, Jia 1 to described first count value；Reduce described rotating speed of target R0；
In one embodiment by described rotating speed of target R0Reduce the 3rd preset value P3.
Recovery module 32, for after initial time section T of preset time period, as rotating speed of target R0With described direct current
The difference of the current rotating speed of blower fan is less than or equal to the second preset value P2When, recover described rotating speed of target R0.
It is to be understood that being to enter in the time period T of overcurrent protection state in power control module, work as rotating speed of target
R0Current rotating speed R with described DC faniDifference be more than the second preset value P2When, count again.It should be noted that here
Rotating speed of target R0It is set in program, have direct pass with the power supply parameter of motor of DC fan itself and load etc.
System, if blower fan runs well, rotating speed is not up to rotating speed of target R0, when the rotating speed of blower fan reaches rotating speed of target R0When it is meant that
Load is led to increase because motor temperature rises the reason such as high, now power control module will be according to rotating speed of target R0Automatically reduce
The output of supply voltage, forces rotation speed of fan to reduce, subsequently automatically replies normal supply voltage.When load is not reduced to
In the case of normal value, as long as supply voltage recovers, the rotating speed of blower fan also can rise, as long as reaching rotating speed of target, equally can touch
The on-off circuit of dynamic power control module, reduces the output of supply voltage automatically, forces rotation speed of fan to reduce, and so repeatedly, supplies
The on-off circuit of electric control module frequently cut-offs, and can greatly shorten its service life.
To sum up, this programme, by above measure, will automatically reduce the output of supply voltage in power control module
Meanwhile, by detecting current rotating speed R according to preset frequencyiWith rotating speed of target R during reducing0Gap (i.e. R0-Ri), and
By this gap and the second preset value P2Relatively, if the former is more than the latter, count again, hereafter, by preset time period
Interior by reduce rotating speed of target R0Numerical value, reduce secondary counting the frequency, simultaneously power control module will according to reduce after
Rotating speed of target control the current rotating speed of blower fan, and slowly recover rotating speed of target after preset time period, this process is suitable
In reduce fans load, more slowly increase load, reduce supply voltage after, for the previous period interior reduce blower fan turn
Speed, if can be reduced to one by the current rotating speed of blower fan in this way after power control module restores electricity voltage
Suitable scope, then secondary counting result will not increase, then slowly recover again, then power control module being capable of normal work；
If by way of above-mentioned reduction rotating speed of target after power control module restores electricity voltage, the rotating speed of blower fan drastically under
Fall, then the frequency rising of secondary counting, when reaching setting value, controller may turn off the input of control signal, power supply control
Module does not have control signal to input, and stops powering to blower fan.
The second preset value P in this programme one embodiment2Take 200 it is understood that being, the process that current rotating speed reduces
In, when falling below 200 turns of rotating speed of target, enumerator is counted again, in counting and the first counting module here
Count and do not conflict, when respective condition meets, counted respectively.
Exist with the difference of embodiment one, the decline of the rotating speed of blower fan here is because overload leads to supply module to drop
The output of low suppling voltage leads to, and not judges the condition that the inertia after blower fan power-off rotates, the first preset value P1It is basis
The design parameter of the supply voltage that power control module reduces carries out testing acquisition.
In this programme one embodiment, the second counting module 21, it is additionally operable to when counting again, by described rotating speed of target R0
Reduce the 3rd preset value P3；
In the application one embodiment, preset time period T is 60 seconds, the current rotating speed R of DC faniAccording to predeterminated frequency
Obtained it is assumed that per second obtain 3 sampled datas, the second preset value P2Take 200, then in R1-R0<When -200, secondary counting 1,
At this moment by rotating speed of target R0Reduce the 3rd preset value P3, obtaining R2Before, the supply voltage of power control module is recovered,
Now, be equivalent to the load reduction of blower fan, the rotating speed of blower fan declines therewith, for example, rotating speed of target R0Reduce 150 turns afterwards,
The rotating speed of blower fan have dropped 100 turns, then R2-R0'=R1--100-(R0- 150)=R1-R0+ 50, may be unsatisfactory for<200 bar
Part, at this moment shows that the adjustment numerical value of rotating speed of target is suitable, secondary counting result will not increase, then triggers following recovery mould
Block 22；If in rotating speed of target R0Reduce 150 turns afterwards, the rotating speed of blower fan have dropped 155 turns, then R2-R0'=R1--155-
(R0- 150)=R1-R0- 5, due to R1-R0<- 200, then R1-R0-5<- 200, now, show that the adjustment numerical value of rotating speed of target is not
Suitably, secondary counting result continues to increase, when reaching setting value, execution step S23, S24, and cut off power control module in time
Control signal.
Second counting module 31, is additionally operable to gradually reduce described rotating speed of target, and the amount sum reducing every time is described the
Three preset values.Including：
First slowdown module 31A, for, in the first sub- time period t1 of described initial time section T, described target being turned
Fast R0Reduce the 4th preset value P4；
In one embodiment, initial time section T is 60 seconds, and the first sub- time period t1 takes 0～30 second, then in power supply control mould
In first 30 seconds after block entrance overcurrent protection state, as rotating speed of target R0Current rotating speed R with described DC faniDifference be more than the
Two preset value P2When (such as 100 turns), while starting secondary counting, by rotating speed of target R0Reduce the 4th preset value P4；After reduction
Current rotating speed of target is：R0-P4；I.e. Rule of judgment (current goal rotating speed R0Current rotating speed R with described DC faniDifference
More than the second preset value P2) when whether meeting it should be to judge：Ri-(R0-P4) whether<-200.The sampling of the current rotating speed of blower fan
Continue according to sample frequency, if after turning down to rotating speed of target according to above-mentioned 100 turns, the current rotating speed of blower fan reduces
101, above-mentioned condition meets, then carry out secondary counting, this explanation is less to the adjustment amplitude of rotating speed of target, needs more than 30 seconds
Afterwards, carry out below step S21B；If being unsatisfactory for above-mentioned condition to meet, prove that the rotating speed of target adjusting is suitable, energy
Enough rotating speeds suitably reducing blower fan, need not trigger the second slowdown module 31B.
Second slowdown module 31B, for, in the second sub- time period t2 of described initial time section T, reducing the 4th pre-
If value P4Described rotating speed of target (R afterwards0-P4) reduce the 5th preset value P again5；Described first sub- time period t1 and described second
Sub- time period t1 sum is equal to described preset time period T, described 4th preset value P4With described 5th preset value P5Sum is equal to institute
State the 3rd preset value P3；
In one embodiment, the second sub- time period t2 takes 30～60 seconds, then enter overcurrent protection shape in power control module
In latter 30 seconds of state, the 4th preset value P will be reduced4Rotating speed of target (R afterwards0-P4) reduce the 5th preset value P again5；After reduction
Current rotating speed of target is：R0-P4-P5；I.e. Rule of judgment (current goal rotating speed R0Current rotating speed R with described DC faniIt
Difference is more than the second preset value P2) when whether meeting it should be to judge：Ri-(R0-P4-P5) whether<- 200, if be unsatisfactory for, demonstrate,prove
The rotating speed of target of bright adjustment is suitable, can suitably reduce the rotating speed of blower fan；If or meet, can continue to reduce again
Rotating speed of target, or when the amplitude that first time selects reduction is larger, can trigger controller the second counting module 21.
This programme essentially consists in and prevents once the range-adjusting of the reduction of rotating speed of target is too big, directly cuts off to blower fan
Power supply it is impossible to the normal operation of the control module that restores electricity, can by way of gradually small magnitude adjustment using this programme
Improve the normal probability run of the control module that restores electricity, improve recovery rate.
Controller 2 also includes：
Recovery module 22, for as rotating speed of target R0It is less than or equal to the with the difference of the current rotating speed of described DC fan
Two preset value P2When, after described initial time section T, according to current goal rotating speed (R0-P3) and DC fan work as forward
Fast Ri, by current goal rotating speed (R0-P3) revert to and do not reduce the 3rd preset value P3Rotating speed of target R before0.
Suitable in the adjustment numerical value of above-mentioned rotating speed of target, in the case that secondary counting result will not increase, in order to not affect
The normal operation of blower fan is in addition it is also necessary to recover rotating speed of target to original value, in an embodiment of the present invention, in order to not affect wind
The excessively stream of machine, takes the mode gradually recovered, for example per second increase by 10 turns.
Described recovery module 22 includes：
First recovery module 22A, in current goal rotating speed (R0-P3) and DC fan current rotating speed RiIt is all higher than
6th preset value P6When, current goal rotating speed (R0-P3) with described 6th preset value P6For radix, according to the second predeterminated frequency f2By
Secondary incremental mode is recovered to not reducing the 3rd preset value P3Rotating speed of target R before0, the increment being wherein incremented by is △ P；Working as
Front rotating speed of target (R0-P3) it is more than the 6th preset value P6And the current rotating speed R of DC faniLess than the 6th preset value P6When, directly
By current goal rotating speed (R0-P3) it is set to the 6th preset value P6；The increment being wherein incremented by takes 10 revolutions per seconds for △ P；3rd presets
Value P3Take 150, the 6th preset value P6Take 900, in the case that rotating speed of target is higher than 900 revolutions per seconds；And current rotating speed is higher than 900
Turn, or when current rotating speed is higher than 880 turns, rotating speed of target temporary variable switchs to basis with 900, per second plus 10 turns, until recovering
To original rotating speed of target, for example original rotating speed of target is 1500 turns, then need to revert to 1500 turns；Current rotating speed is less than
When 880 turns, rotating speed of target temporary variable is 900 turns.
Second recovery module 22B, in current goal rotating speed (R0-P3) and DC fan current rotating speed RiBetween
Six preset value P6With the 7th preset value P7Between when, current goal rotating speed (R0-P3) with described 7th preset value P7For radix, according to
Second predeterminated frequency f2The mode being gradually incremented by is recovered to not reducing the 3rd preset value P3Rotating speed of target R before0, wherein incremental
Increment be △ P；In current goal rotating speed (R0-P3) between the 6th preset value P6With the 7th preset value P7Between and DC fan
Current rotating speed RiLess than the 7th preset value P7When, directly by current goal rotating speed (R0-P3) it is set to the 7th preset value P7；Wherein
Incremental increment takes 10 revolutions per seconds for △ P；7th preset value P7Take 600；In the case that rotating speed of target is higher than 600 turns, work as forward
Speed is higher than 600 turns, or when current rotating speed is higher than 580 turns, rotating speed of target temporary variable switchs to basic per second plus 10 turns with 600；
Current rotating speed is less than 580 turns, and rotating speed of target temporary variable is 600 turns.
3rd recovery module 22C, in current goal rotating speed (R0-P3) it is less than the 7th preset value P7In the case of；Directly
By current goal rotating speed (R0-P3) be set to not reduce the 3rd preset value P3Rotating speed of target R before0；Wherein said 6th presets
Value P6More than the 7th preset value P7.When current goal rotating speed is less than 600 turns, directly reverts to and do not reduce the 3rd preset value P3Before
Rotating speed of target R0.
These are only the preferred embodiments of the present invention, not thereby limit the present invention the scope of the claims, every using this
Equivalent structure or equivalent flow conversion that bright description and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of DC fan power control module guard method is it is characterised in that described DC fan power control module is protected
Maintaining method comprises the following steps：
Obtain the rotating speed of DC fan according to the first predeterminated frequency；
The difference counting between the rotating speed once obtaining in preset time period and the current rotating speed obtaining is preset more than first
The number of times of value, and it is set to the first count value；
When the first count value is more than setting value, close the input control signal of power control module, so that power control module
Internal power-off.
2. DC fan power control module guard method according to claim 1 is it is characterised in that described DC fan
Power control module guard method also includes：
When getting the current rotating speed of described DC fan, the size adjustment output according to described rotating speed is to described power supply control
The input control signal of module, so that described power control module is according to the correspondingly sized power supply of described input control signal output
Voltage is to described DC fan；
The described input control signal closing power control module is specially：The rotating speed of the DC fan of acquisition is set to 0.
3. DC fan power control module guard method according to claim 1 is it is characterised in that work as first described
When count value is more than setting value, close the input control signal of power control module, defeated to described power control module to stop
Go out before control signal makes the internal power-off of power control module and also include：
In the initial time section of described preset time period, when the difference of rotating speed of target and the rotating speed of described DC fan is more than second
During preset value, Jia 1 to described first count value, and described rotating speed of target is reduced the 3rd preset value；
After the initial time section of described preset time period, be less than in the difference of rotating speed of target and the rotating speed of described DC fan or
During equal to the second preset value, according to the rotating speed of current goal rotating speed and the DC fan getting, will be extensive for current goal rotating speed
Multiple is the rotating speed of target not reduced before the 3rd preset value.
4. DC fan power control module guard method according to claim 3 it is characterised in that described by described mesh
Mark rotating speed reduces the 3rd preset value and includes：
Described rotating speed of target is gradually reduced, the amount sum reducing every time is described 3rd preset value.
5. the DC fan power control module guard method according to claim 3 or 4 is it is characterised in that described ought
The rotating speed of target that front rotating speed of target reverts to before not reducing the 3rd preset value includes：
When the rotating speed of current goal rotating speed and DC fan is all higher than six preset values, current goal rotating speed is pre- with the described 6th
If being worth for radix, being gradually incremented by and recovering to the described rotating speed of target not reduced before the 3rd preset value；Big in current goal rotating speed
In the 6th preset value and DC fan current rotating speed be less than six preset values when, directly current goal rotating speed is set to the 6th
Preset value；
Current goal rotating speed and DC fan rotating speed all between when between the 6th preset value and the 7th preset value, current goal
Rotating speed, with described 7th preset value as radix, is gradually incremented by and recovers to the described rotating speed of target not reduced before the 3rd preset value；
Current goal rotating speed between the 6th preset value and the 7th preset value and DC fan rotating speed be less than seven preset values when,
Directly current goal rotating speed is set to the 7th preset value；
When current goal rotating speed is less than seven preset values；Directly by current goal rotating speed be set to not reduce the 3rd preset value it
Front rotating speed of target；
Wherein said 6th preset value is more than the 7th preset value.
6. a kind of DC fan power control module protection device is it is characterised in that described DC fan power control module is protected
Protection unit includes：
Acquisition module, for obtaining the rotating speed of DC fan according to the first predeterminated frequency；
First counting module, for counting the difference of the rotating speed once obtaining in preset time period and the current rotating speed obtaining
More than the number of times of the first preset value, and it is set to the first count value；
Controller, for when the first count value is more than setting value, cutting out the input control signal of supply module；So that for automatically controlled
Inside modules power-off processed.
7. DC fan power control module protection device according to claim 6 it is characterised in that
Described controller, is additionally operable to when getting the current rotating speed of described DC fan, according to the size adjustment of described rotating speed
Export to the input control signal of described power control module, so that described power control module is according to described input control signal
Export correspondingly sized supply voltage to described DC fan；
When the first count value is more than setting value, the rotating speed of the DC fan of acquisition is set to 0；So that in power control module
Portion's power-off.
8. DC fan power control module protection device according to claim 6 is it is characterised in that described DC fan
Power control module protection device also includes：
Second counting module, in the initial time section of preset time period, in turning of rotating speed of target and described DC fan
When the difference of speed is more than the second preset value, Jia 1 to described first count value, and described rotating speed of target reduction the 3rd is preset
Value；
Recovery module, for after the initial time section of preset time period, in the rotating speed of rotating speed of target and described DC fan
Difference when being less than or equal to the second preset value, according to the rotating speed of current goal rotating speed and the DC fan getting, will be current
Rotating speed of target reverts to the rotating speed of target not reduced before the 3rd preset value.
9. DC fan power control module protection device according to claim 8 is it is characterised in that described second counts
Module, is additionally operable to gradually reduce described rotating speed of target, and the amount sum reducing every time is described 3rd preset value.
10. DC fan power control module protection device according to claim 8 or claim 9 is it is characterised in that described recovery
Module includes：
First recovery module, when being all higher than six preset values for the rotating speed in current goal rotating speed and DC fan, current mesh
Mark rotating speed, with described 6th preset value as radix, is gradually incremented by the described target recovered to before do not reduce the 3rd preset value and turns
Speed；When the rotating speed being more than the 6th preset value and DC fan in current goal rotating speed is less than six preset values, directly by current mesh
Mark rotating speed is set to the 6th preset value；
Second recovery module, for current goal rotating speed and DC fan rotating speed between the 6th preset value with pre- more than the 7th
If when between value, current goal rotating speed, with described 7th preset value as radix, is gradually incremented by and recovers to not reducing the 3rd preset value
Described rotating speed of target before；Current goal rotating speed between the 6th preset value and the 7th preset value and DC fan turn
When speed is less than seven preset values, directly current goal rotating speed is set to the 7th preset value；
3rd recovery module, for when current goal rotating speed is less than seven preset values；Directly current goal rotating speed is set to
Do not reduce the rotating speed of target before the 3rd preset value；
Wherein said 6th preset value is more than the 7th preset value.
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