CN106385007B - The guard method of DC fan power control module and device - Google Patents
The guard method of DC fan power control module and device Download PDFInfo
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- CN106385007B CN106385007B CN201610851366.9A CN201610851366A CN106385007B CN 106385007 B CN106385007 B CN 106385007B CN 201610851366 A CN201610851366 A CN 201610851366A CN 106385007 B CN106385007 B CN 106385007B
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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 kind of DC fan power control module guard method and device, method includes the following steps: obtaining the revolving speed of DC fan according to the first predeterminated frequency；Difference of the statistics within a preset period of time between the last revolving speed obtained and the revolving speed currently obtained is greater than the number of the first preset value, and is set as the first count value；When the first count value is greater than the set value, the input control signal of power control module is closed, so that power-off inside power control module.Before the solution of the present invention can cause DC fan overcurrent to power off in power control module output current phase short circuit, and blower stops operating, the control signal of single-chip microcontroller is automatically cut off, power control module is 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 technique
In existing DC frequency-changing blower technology, single-chip microcontroller is according to the revolving speed of the blower of acquisition, room temperature, outdoor temperature
Etc. parameters export control signal to power control module, by the phase current of control power control module output, to control wind
The revolving speed of machine.It is not zero as long as blower is in rotary state, that is, rotation speed of fan, single-chip microcontroller will export control signal, power supply control
The phase current of module output is just not zero.
When short circuit occurs between the phase current of DC fan power control module output, supply current is increased, and reaches
When the threshold value being arranged to overcurrent protection, the power supply powered to DC fan is automatically cut off, at this moment blower can run one due to inertia
The section time just can be out of service.
Within this period of blower inertia operation, since rotation speed of fan is not zero, single-chip microcontroller can also be according to blower at this time
Revolving speed still has electric current to flow through, power control module is defeated to power control module input control signal inside power control module
Occur the overlong time of short circuit between phase and phase out, will lead to DC fan power control module itself damage.
Summary 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.
To achieve the above object, DC fan power control module guard method proposed by the present invention, comprising the following steps:
The revolving speed of DC fan is obtained according to the first predeterminated frequency；
Difference of the statistics within a preset period of time between the last revolving speed obtained and the revolving speed currently obtained is greater than first
The number of preset value, and it is set as the first count value；
When the first count value is greater than the set value, the input control signal of power control module is closed, so that power supply control
Inside modules power-off.
Preferably, the DC fan power control module guard method further include:
When getting the current revolving speed of the DC fan, according to the size of revolving speed adjustment output to the power supply
The input control signal of control module, so that the power control module is of corresponding size according to input control signal output
Supply voltage is to the DC fan；
The input control signal for closing power control module specifically: the revolving speed for the DC fan that will acquire is set as
0。
Preferably, the input control signal of power control module is closed when the first count value is greater than the set value described,
Before stopping making to power off inside power control module to power control module output control signal further include:
In the initial time section of the preset time period, when the difference of rotating speed of target and the revolving speed of the DC fan is greater than
When the second preset value, first count value is carried out to add 1, and the rotating speed of target is reduced third preset value；
It is small in the difference of rotating speed of target and the revolving speed of the DC fan after the initial time section of the preset time period
When the second preset value, according to current goal revolving speed and the revolving speed of the DC fan got, current goal is turned
Quick-recovery is the rotating speed of target not reduced before third preset value.
Preferably, described to include: by rotating speed of target reduction third preset value
The rotating speed of target is gradually reduced, the sum of amount reduced every time is the third preset value.
Preferably, rotating speed of target current goal revolving speed reverted to before not reducing third preset value includes:
When the revolving speed of current goal revolving speed and DC fan is all larger than four preset values, current goal revolving speed is with described
Four preset values are radix, are gradually incremented by the rotating speed of target restored to before not reducing third preset value；Turn in current goal
When speed is greater than the current rotating speed of the 4th preset value and DC fan less than four preset values, directly set current goal revolving speed to
4th preset value；
When the revolving speed of current goal revolving speed and DC fan is between the 4th preset value and the 5th preset value, currently
Rotating speed of target is gradually incremented by the target restored to before not reducing third preset value and turns using the 5th preset value as radix
Speed；Current goal revolving speed is between the 4th preset value and the 5th preset value and the revolving speed of DC fan is less than the 5th preset value
When, directly the 5th preset value is set by current goal revolving speed；
When current goal revolving speed is less than five preset values；It directly is set as the current goal revolving speed not reduce third and preset
Rotating speed of target before value；
Wherein the 4th preset value is greater than the 5th preset value.
To achieve the above object, the present invention also provides a kind of DC fan power control module protective devices, comprising:
Acquisition module, for obtaining the revolving speed of DC fan according to the first predeterminated frequency；
First counting module, for counting the revolving speed that the last time obtains within a preset period of time and the revolving speed currently obtained
Difference is greater than the number of the first preset value, and is set as the first count value；
Controller, for closing the input control signal of power supply module when the first count value is greater than the set value；So that for
Power-off inside electric control module.
Preferably, the controller is also used to when getting the current revolving speed of the DC fan, according to the revolving speed
Size adjustment output to the power control module input control signal, so that the power control module is according to described defeated
Enter to control signal and exports supply voltage of corresponding size to the DC fan；
When the first count value is greater than the set value, the revolving speed for the DC fan that will acquire is set as 0；So that power supply control mould
Power-off inside block.
Preferably, the DC fan power control module protective device further include:
Second counting module, in the initial time section of preset time period, in rotating speed of target and the DC fan
The difference of revolving speed when being greater than the second preset value, first count value is carried out plus 1, and it is pre- that the rotating speed of target reduced third
If value；
Recovery module, for after the initial time section of preset time period, in rotating speed of target and the DC fan
It, will according to current goal revolving speed and the revolving speed of the DC fan got when the difference of revolving speed is less than or equal to the second preset value
Current goal revolving speed reverts to the rotating speed of target before not reducing third preset value.
Preferably, second counting module is also used to gradually reduce the rotating speed of target, the sum of amount reduced every time
For the third preset value.
Preferably, the recovery module includes:
First recovery module, for when the revolving speed of current goal revolving speed and DC fan is all larger than four preset values, when
Preceding rotating speed of target is gradually incremented by the target restored to before not reducing third preset value using the 4th preset value as radix
Revolving speed；It, directly will be current when current goal revolving speed is greater than the revolving speed of the 4th preset value and DC fan less than four preset values
Rotating speed of target is set as the 4th preset value；
Second recovery module, it is pre- between the 4th preset value and the 5th for the revolving speed in current goal revolving speed and DC fan
If when between value, current goal revolving speed is gradually incremented by and restores to not reducing third preset value using the 5th preset value as radix
The rotating speed of target before；Current goal revolving speed between the 4th preset value and the 5th preset value and DC fan turn
When speed is less than five preset values, the 5th preset value directly is set by current goal revolving speed；
Third recovery module, for when current goal revolving speed is less than five preset values；Directly current goal revolving speed is set
The rotating speed of target being set to before not reducing third preset value；
Wherein the 4th preset value is greater than the 5th preset value.
In technical solution of the present invention, when short circuit occurs between the phase current of DC fan power control module output, supply
Electric current increases, and when reaching the threshold value of overcurrent protection setting, automatically cuts off to DC fan power supply, at this moment blower by
In inertia meeting continuous service, but revolving speed can sharply decline, and by the revolving speed of detection DC fan in this programme, and set properly
Parameter when descent amplitude is more than the first preset value, at this moment carry out when the revolving speed of DC fan is sampled according to the first predeterminated frequency
It counts, when counting reaches setting value, can determine that DC fan is in off-position, since inertia remains operational, close control
Signal processed is terminated and is exported outward when power control module does not control signal input, phase current zero, and turn of blower at this time
Speed does not decelerate to zero also, also needs a period of time that can just stop operating in other words, actually shortens power supply control relative to existing
The time short-circuit between phase and phase of module, so that DC fan power control module be protected to be damaged.
Detailed description of the invention
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 that rotating speed of target is reduced 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 for restoring rotating speed of target
Cheng Tu；
Fig. 6 is the module frame figure of DC fan power control module protective device embodiment one of the present invention；
Fig. 7 is the module frame figure of DC fan power control module protective device embodiment two of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention proposes a kind of DC fan power control module guard method.
Embodiment one
Fig. 1 is please referred to, in an embodiment of the present invention, the DC fan power control module guard method, including it is 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, revolving speed is in nonlinear change to blower, in incipient a period of time,
Revolving speed sharply declines, behind a period of time region it is gentle, the scheme of the application is in front in shorter time according to predeterminated frequency
By obtaining the amplitude of revolving speed decline, to judge state that inertia after whether blower is in above-mentioned power-off rotates, such as f here1
=100Hz, then interior sampling 100 times per second, the current rotating speed of DC fan is followed successively by R1、R2、R3……R100。
Step S2, the statistics revolving speed R that the last time obtains within a preset period of timei-1With the revolving speed R currently obtainediBetween
Difference is greater than the first preset value P1Number, and be set as the first count value；
Assuming that 100 turns of the decline per second of the revolving speed of DC fan, regards as the inertia rotary state that blower is in 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 relating to parameters such as characteristic of machine itself such as supply voltage, load, actual speed system, is set according to different fan parameters
It sets, according to the first predeterminated frequency f1Sampling is compared, if meeting condition: Ri-1-Ri>P1, with regard to once being counted.It is wherein last
Revolving speed is Ri-1, current rotating speed Ri。
In an embodiment of the present invention by comparing a preceding revolving speed Ri-1With current rotating speed RiDifference be greater than the first preset value
P1Number, as judging whether blower is in the standard for the state that inertia rotates after above-mentioned power-off, such as the first preset value P1=
100, then work as R1-R2When=105,1 is counted, R is worked as3-R4When=110,2 are counted；And so on.
Step S5, when the first count value reaches setting value N1When, the input control signal of power control module is closed, so that
Power-off inside power control module.
Here using count results as control condition, if the count results in step S2 reach N1, then it is assumed that enough energy
It determines that blower has powered off, and since inertia rotates, at this moment can then close the input control signal of power control module, so that
Power control module stops output, i.e., output current phase is zero, and output phase and phase short circuit will not influence power control module, in this way
Power control module can be protected before blower stops operating, without just right after blower stops operating
Power control module is protected, and compared with the existing technology, it is short-circuit between phase and phase to substantially reduce power control module output
State, to play the role of protecting in time.
Embodiment two
Referring to Fig. 2, as the preferred embodiment of above-described embodiment one, the method also includes:
Step S6, when getting the current revolving speed of the DC fan, extremely according to the size of revolving speed adjustment output
The input control signal of the power control module, so that the power control module is according to the input control signal output phase
Answer the supply voltage of size to the DC fan；
In step S5, the input control signal of power control module is closed specifically: the revolving speed for the DC fan that will acquire
It is set as 0.
Such as setting value N1=100, above-mentioned count results are 100, then the current rotating speed R for the DC fan that will acquire100
It is revised as zero, what needs to be explained here is that, the current rotating speed R of the DC fan obtained every time aboveiIt is not zero, even if counting
In the case that number result reaches setting value, also it is not zero, such as R here100Also it is not zero, is revised as zero here, be to pass through journey
Sequence assigns R for zero100。
Here controller can be single-chip microcontroller, and single-chip microcontroller exports 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 of acquisition
It is exported, in the current rotating speed R of DC faniWhen being not zero, all there can be pulse control signal PWM to export to power supply always
Control module needs immediately to break pulse control signal PWM to protect the power control module for being in short-circuit condition, this
In through the above way confirming the current rotating speed R of DC fan that will acquire in the case where DC fan power-offiZero is revised as,
At this point, current rotating speed R of the controller in DC faniIn the case where being zero, directly closing pulse control signal PWM, mould of powering
Block does not have input signal, does not have output naturally, so that the power control module in short-circuit condition is protected.
Embodiment three
Referring to figure 3., in an alternative embodiment of the invention, the DC fan power control module guard method, including with
Lower step:
Step S3, in the initial time section T of the preset time period, when the revolving speed of rotating speed of target and the DC fan
RiDifference when being greater than the second preset value, first count value is carried out plus 1, and the rotating speed of target is reduced into third preset value
P3；
Initial time section T is 60 seconds in one embodiment of the application, the current rotating speed R of DC faniAccording to predeterminated frequency
It is obtained, it is assumed that 3 sampled datas of acquisition per second, the second preset value P2200 are taken, then in R1-R0When < -200, secondary counting 1,
At this moment by rotating speed of target R0Reduce third preset value P3, obtaining R2Before, the supply voltage of power control module is recovered,
At this point, being equivalent to the load reduction of blower, the revolving speed of blower declines therewith, for example, rotating speed of target R0After reducing 150 turns,
The revolving speed of blower has dropped 100 turns, then R2-R0'=R1-100-(R0- 150)=R1-R0+ 50, it may be unsatisfactory for < 200 condition,
At this moment showing the adjustment numerical value of rotating speed of target is suitably, and secondary counting result not will increase, then carries out following step S4；Such as
Fruit is in rotating speed of target R0After reducing 150 turns, the revolving speed of blower has dropped 155 turns, then R2-R0'=R1-155-(R0- 150)=
R1-R0- 5, due to R1-R0< -200, then R1-R0- 5 < -200, at this point, show the adjustment numerical value of rotating speed of target be it is inappropriate, two
Secondary count results continue to increase, and when reaching setting value, execute step S5, S6, cut off the control signal of power control module in time.
Step S4, after the initial time section T of the preset time period, in rotating speed of target R0With the DC fan
Revolving speed RiDifference be less than or equal to the second preset value P2When, according to current goal revolving speed R0And the revolving speed R of DC fani, will work as
Preceding rotating speed of target (R0-P3) revert to and do not reduce third preset value P3Rotating speed of target R before0。
It is suitable in the adjustment numerical value of above-mentioned rotating speed of target, secondary counting result will not in increased situation, in order to not influence
The normal operation of blower, it is also necessary to restore rotating speed of target to original value, in an embodiment of the present invention, in order to not influence wind
The overcurrent of machine takes the mode being gradually recovered, such as 10 turns of increase per second.
It is to be understood that work as rotating speed of target in the period T that power control module enters overcurrent protection state
R0With the current rotating speed R of the DC faniDifference be greater than the second preset value P2When, it counts again.It should be noted that here
Rotating speed of target R0It is set in program, has direct pass with the parameter of the power supply motor of DC fan itself and load etc.
System, if blower runs well, revolving speed is not up to rotating speed of target R0, when the revolving speed of blower reaches rotating speed of target R0When, it is meant that
Load is caused to increase due to motor temperature raising etc., power control module will be according to rotating speed of target R at this time0It is automatic to reduce
The output of supply voltage forces rotation speed of fan to reduce, then automatically replies normal supply voltage.When load is not reduced to
In the case where normal value, as long as supply voltage restores, the revolving speed of blower can also rise, as long as reaching rotating speed of target, can equally touch
The switching circuit of dynamic power control module, the automatic output for reducing supply voltage, forces rotation speed of fan to reduce, and repeatedly, supplies
The switching circuit of electric control module is frequently cut-off, and can greatly shorten its service life.
To sum up, this programme pass through more than measure, the output of supply voltage will be reduced automatically in power control module
Meanwhile by detecting current rotating speed R according to preset frequencyiDuring reduction with rotating speed of target R0Gap (i.e. R0-Ri), and
By the gap and the second preset value P2Compare, if the former is greater than the latter, counts again, hereafter, by preset time period
It is interior to pass through reduction rotating speed of target R0Numerical value, reduce the frequency of secondary counting, while after power control module will be according to reduction
Rotating speed of target control blower current rotating speed, and slowly restore rotating speed of target after preset time period, this process is suitable
In reduction fans load, then slowly increase load, after reducing supply voltage, in interior turn for reducing blower for the previous period
Speed, if the current rotating speed of blower can be reduced to one after power control module restores electricity voltage in this way
Suitable range, then secondary counting result not will increase, and then slowly restore again, then power control module can work normally；
If by way of above-mentioned reduction rotating speed of target after power control module restores electricity voltage, the revolving speed of blower sharply under
Drop, then the frequency of secondary counting increases, and when reaching setting value, controller may turn off the input of control signal, power supply control
Module does not control signal input, stops powering to blower.
The second preset value P in one embodiment of this programme2Take 200, it is understood that be the process that current rotating speed reduces
In, when falling below 200 turns of rotating speed of target, counter is counted again, the counting in counting and step S2 here
Do not conflict, when respective condition meets, is counted respectively.
Exist with the difference of embodiment one, the decline of the revolving speed of blower here is since overload causes power supply module to drop
Caused by the output of low suppling voltage, the condition of the inertia rotation after not judging blower power-off, the first preset value P1It is basis
The design parameter for the supply voltage that power control module reduces carries out experiment acquisition.
Step S5, when counting reaches setting value N1When, the current rotating speed R for the DC fan that will acquireiIt is set as zero, so that
Power-off inside power control module；
By the adjustment in step S3 to rotating speed of target, after the supply voltage of power control module restores, blower turns
Prompt drop low amplitude value is excessive, then the secondary counting result in step S3 will increase, and when reaching setting value, modifies the direct current wind of acquisition
The current rotating speed R of machineiIt is zero.Current rotating speed R of the controller in the DC fan of acquisitioniWhen being zero, power control module is closed
Input control signal.
Step S6, when getting the current revolving speed of the DC fan, extremely according to the size of revolving speed adjustment output
The input control signal of the power control module, so that the power control module is according to the input control signal output phase
Answer the supply voltage of size to the DC fan.
Current rotating speed R of the controller in the DC fan of acquisitioniIn the case where being arranged to zero, pulse control is directly closed
Signal PWM, power supply module do not have input signal, do not have output, so that power control module is protected.When adjustment
When rotating speed of target is inappropriate, power control module is protected in this manner；If the rotating speed of target of adjustment is appropriate,
Power control module can restore normally, and without step S5 and step S6.
Example IV
Referring to fig. 4, in step S3, by the rotating speed of target R0Reduce third preset value P3Specifically: by the rotating speed of target
R0It gradually reduces, the sum of amount reduced every time is the third preset value P3。
Here the mode of reduction rotating speed of target is specifically carried out by the way of gradually decreasing stage by stage, and step S3 includes:
Step S3A, in the first sub- period t1 of initial time section T, by the rotating speed of target R0It is default to reduce the 6th
Value P4；
In one embodiment, preset time period T is 60 seconds, and the first sub- period t1 takes 0~30 second, then in power supply control mould
Block enters after overcurrent protection state in first 30 seconds, as rotating speed of target R0With the current rotating speed R of the DC faniDifference be greater than the
Two preset value P2When (such as 100 turns), while starting secondary counting, by rotating speed of target R0Reduce the 6th preset value P4；After reduction
Current rotating speed of target are as follows: R0-P4；That is Rule of judgment (current goal revolving speed R0With the current rotating speed R of the DC faniDifference
Greater than the second preset value P2) when whether meeting, it should it is judgement: Ri-(R0-P4) whether < -200.The sampling of blower current rotating speed
Continue according to sample frequency, if the current rotating speed of blower reduces after turning down according to above-mentioned 100 turns to rotating speed of target
101, above-mentioned condition meets, then carries out secondary counting, this explanation is smaller to the adjustment amplitude of rotating speed of target, needs more than 30 seconds
Afterwards, following step S21B is carried out；If being unsatisfactory for above-mentioned condition satisfaction, prove that the rotating speed of target of adjustment is suitable, energy
Enough appropriate revolving speeds for reducing blower, without carrying out following step S21B.
Step S3B will reduce the 6th preset value P in the second sub- period t2 of initial time section T4Target afterwards turns
Speed (R0-P4) the 7th preset value P is reduced again5；The sum of first sub- sub- period t1 of period t1 and second is equal to preset time period
T, the 6th preset value P4With the 7th preset value P5The sum of be equal to third preset value P3；
In one embodiment, the second sub- period t2 takes 30~60 seconds, then enters overcurrent protection shape in power control module
In latter 30 seconds of state, the 6th preset value P will be reduced4Rotating speed of target (R afterwards0-P4) the 7th preset value P is reduced again5；After reduction
Current rotating speed of target are as follows: R0-P4-P5；That is Rule of judgment (current goal revolving speed R0With the current rotating speed R of the DC faniIt
Difference is greater than the second preset value P2) when whether meeting, it should it is judgement: Ri-(R0-P4-P5) whether < -200, if conditions are not met, then demonstrate,proving
The rotating speed of target of bright adjustment is suitably, can suitably to reduce the revolving speed of blower；If still met, can continue to reduce again
Rotating speed of target, or when first time selecting reduced amplitude larger, step 23 can be performed.
This programme, which essentially consists in, to be prevented once by the too big of the reduced range-adjusting of rotating speed of target, and directly cutting is to blower
Power supply, the normal operation for the control module that can not restore electricity can by way of gradually small magnitude adjustment using this programme
The probability for improving the control module normal operation that restores electricity, improves recovery rate.
Embodiment five
Three kinds of reset modes are provided below, step 4 includes: if power control module restores to operate normally referring to Fig. 5
Step S4A, in current goal revolving speed (R0-P3) and DC fan current rotating speed RiIt is all larger than the 4th preset value P6
When, current goal revolving speed (R0-P3) with the 4th preset value P6For radix, according to the second predeterminated frequency f2Gradually incremental mode is extensive
It is multiple to not reducing third preset value P3The rotating speed of target R before0；In current goal revolving speed (R0-P3) it is greater than the 4th preset value
P6And the current rotating speed R of DC faniLess than the 4th preset value P6When, directly by current goal revolving speed (R0-P3) it is set as the 4th
Preset value P6；
Wherein incremental increment is that △ P takes 10 revolutions per seconds；Third preset value P3150 are taken, the 4th preset value P6900 are taken, in mesh
Revolving speed is marked to be higher than in the case where 900 revolutions per seconds；And current rotating speed is higher than 900 turns or when current rotating speed is higher than 880 turns, target
Revolving speed temporary variable switchs to basis with 900, per second to add 10 turns, until being restored to original rotating speed of target, such as original target
Revolving speed is 1500 turns, then needs to revert to 1500 turns；When current rotating speed is lower than 880 turns, rotating speed of target temporary variable is 900 turns.
Step S4B, in current goal revolving speed (R0-P3) and DC fan current rotating speed RiBetween the 4th preset value P6
With the 5th preset value P7Between when, current goal revolving speed (R0-P3) with the 5th preset value P7For radix, according to the second predeterminated frequency f2
Gradually incremental mode is restored to not reducing third preset value P3Rotating speed of target R before0；In current goal revolving speed (R0-P3) be situated between
In the 4th preset value P6With the 5th preset value P7Between and DC fan current rotating speed RiLess than the 5th preset value P7When, directly
By current goal revolving speed (R0-P3) it is set as the 5th preset value P7；
Wherein incremental increment is that △ P takes 10 revolutions per seconds；5th preset value P7Take 600；In rotating speed of target higher than 600 turns
In the case of, for current rotating speed 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 lower than 580 turns, and rotating speed of target temporary variable is 600 turns.
Step S4C, in current goal revolving speed (R0-P3) less than the 5th preset value P7In the case where；Directly current goal is turned
Speed (R0-P3) be set as not reducing third preset value P3Rotating speed of target R before0；Wherein the 4th preset value P6Greater than the 5th
Preset value P7。
When current goal revolving speed is lower than 600 turns, directly reverting to does not reduce third preset value P3Rotating speed of target R before0。
The present invention proposes a kind of DC fan power control module protective device.
Embodiment one
Referring to Fig. 6, in an embodiment of the present invention, which includes acquisition module
1, the first counting module 2 and controller 3, in which:
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, revolving speed is in nonlinear change to blower, in incipient a period of time,
Revolving speed sharply declines, behind a period of time region it is gentle, the scheme of the application is in front in shorter time according to predeterminated frequency
By obtaining the amplitude of revolving speed decline, to judge state that inertia after whether blower is in above-mentioned power-off rotates, such as f here1
=100Hz, then interior sampling 100 times per second, the current rotating speed of DC fan is followed successively by R1、R2、R3……R100。
First counting module 2, for counting the last revolving speed R obtained within a preset period of timei-1Turn with what is currently obtained
Fast RiDifference be greater than the first preset value P1Number, and be set as the first count value；
Assuming that 100 turns of the decline per second of the revolving speed of DC fan, regards as the inertia rotary state that blower is in 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 relating to parameters such as characteristic of machine itself such as supply voltage, load, actual speed system, is set according to different fan parameters
It sets, according to the first predeterminated frequency f1Sampling is compared, if meeting condition: Ri-1-Ri>P1, with regard to once being counted.It is primary before wherein
Revolving speed is Ri-1, current rotating speed Ri。
In an embodiment of the present invention by comparing a preceding revolving speed Ri-1With current rotating speed RiDifference be greater than the first preset value
P1Number, as judging whether blower is in the standard for the state that inertia rotates after above-mentioned power-off, such as the first preset value P1=
100, then work as R1-R2When=105,1 is counted, R is worked as3-R4When=110,2 are counted；And so on.
For reaching setting value N in the first count value1When, the input control signal of power control module is closed, so that for
Power-off inside electric control module.
Here using count results as control condition, if the first count value reaches N1, then it is assumed that it can determine that blower enough
It has been powered off that, and since inertia rotates, the input control signal of power control module at this moment can be then closed, so that power supply control
Module stops output, i.e., output current phase is zero, and output phase and phase short circuit will not influence power control module, in this way can be in wind
Machine can protect power control module before stopping operating, without waiting until after blower stops operating just to power supply control
Module is protected, and compared with the existing technology, substantially reduces power control module output short-circuit condition between phase and phase, thus
Play the role of protecting in time.
The controller 3 is also used to when getting the current revolving speed of the DC fan, according to the size of the revolving speed
Adjustment is exported to the input control signal of the power control module, so that the power control module is according to the input control
Signal exports supply voltage of corresponding size to the DC fan；
N is greater than the set value in the first count value1When, the revolving speed for the DC fan that will acquire is set as 0；So that power supply control
Inside modules power-off.
Such as setting value N1=100, above-mentioned count results are 100, then the current rotating speed R for the DC fan that will acquire100
It is revised as zero, what needs to be explained here is that, the current rotating speed R of the DC fan obtained every time aboveiIt is not zero, even if counting
In the case that number result reaches setting value, also it is not zero, such as R here100Also it is not zero, is revised as zero here, be to pass through journey
Sequence assigns R for zero100。
Here controller can be single-chip microcontroller, and single-chip microcontroller exports 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 of acquisition
It is exported, in the current rotating speed R of DC faniWhen being not zero, all there can be pulse control signal PWM to export to power supply always
Control module needs immediately to break pulse control signal PWM to protect the power control module for being in short-circuit condition, this
In through the above way confirming the current rotating speed R of DC fan that will acquire in the case where DC fan power-offiZero is revised as,
At this point, current rotating speed R of the controller in DC faniIn the case where being zero, directly closing pulse control signal PWM, mould of powering
Block does not have input signal, does not have output naturally, so that the power control module in short-circuit condition is protected.
Embodiment two
In an alternative embodiment of the invention, referring to Fig. 7:
Controller 3 further include:
Second counting module 31, in the initial time section T of preset time period, in rotating speed of target R0With the direct current
The revolving speed R of bloweriDifference be greater than the second preset value P2When, first count value is carried out to add 1；Reduce the rotating speed of target R0；
In one embodiment by the rotating speed of target R0Reduce third preset value P3。
Recovery module 32, for working as rotating speed of target R after the initial time section T of preset time period0With the direct current
The difference of the current rotating speed of blower is less than or equal to the second preset value P2When, restore the rotating speed of target R0。
It is to be understood that work as rotating speed of target in the period T that power control module enters overcurrent protection state
R0With the current rotating speed R of the DC faniDifference be greater than the second preset value P2When, it counts again.It should be noted that here
Rotating speed of target R0It is set in program, has direct pass with the parameter of the power supply motor of DC fan itself and load etc.
System, if blower runs well, revolving speed is not up to rotating speed of target R0, when the revolving speed of blower reaches rotating speed of target R0When, it is meant that
Load is caused to increase due to motor temperature raising etc., power control module will be according to rotating speed of target R at this time0It is automatic to reduce
The output of supply voltage forces rotation speed of fan to reduce, then automatically replies normal supply voltage.When load is not reduced to
In the case where normal value, as long as supply voltage restores, the revolving speed of blower can also rise, as long as reaching rotating speed of target, can equally touch
The switching circuit of dynamic power control module, the automatic output for reducing supply voltage, forces rotation speed of fan to reduce, and repeatedly, supplies
The switching circuit of electric control module is frequently cut-off, and can greatly shorten its service life.
To sum up, this programme pass through more than measure, the output of supply voltage will be reduced automatically in power control module
Meanwhile by detecting current rotating speed R according to preset frequencyiDuring reduction with rotating speed of target R0Gap (i.e. R0-Ri), and
By the gap and the second preset value P2Compare, if the former is greater than the latter, counts again, hereafter, by preset time period
It is interior to pass through reduction rotating speed of target R0Numerical value, reduce the frequency of secondary counting, while after power control module will be according to reduction
Rotating speed of target control blower current rotating speed, and slowly restore rotating speed of target after preset time period, this process is suitable
In reduction fans load, then slowly increase load, after reducing supply voltage, in interior turn for reducing blower for the previous period
Speed, if the current rotating speed of blower can be reduced to one after power control module restores electricity voltage in this way
Suitable range, then secondary counting result not will increase, and then slowly restore again, then power control module can work normally；
If by way of above-mentioned reduction rotating speed of target after power control module restores electricity voltage, the revolving speed of blower sharply under
Drop, then the frequency of secondary counting increases, and when reaching setting value, controller may turn off the input of control signal, power supply control
Module does not control signal input, stops powering to blower.
The second preset value P in one embodiment of this programme2Take 200, it is understood that be the process that current rotating speed reduces
In, when falling below 200 turns of rotating speed of target, counter is counted again, in counting and the first counting module here
Counting do not conflict, when respective condition meets, counted respectively.
Exist with the difference of embodiment one, the decline of the revolving speed of blower here is since overload causes power supply module to drop
Caused by the output of low suppling voltage, the condition of the inertia rotation after not judging blower power-off, the first preset value P1It is basis
The design parameter for the supply voltage that power control module reduces carries out experiment acquisition.
In one embodiment of this programme, the second counting module 21 is also used to when counting again, by the rotating speed of target R0
Reduce third preset value P3；
Preset time period T is 60 seconds in one embodiment of the application, the current rotating speed R of DC faniAccording to predeterminated frequency
It is obtained, it is assumed that 3 sampled datas of acquisition per second, the second preset value P2200 are taken, then in R1-R0When < -200, secondary counting 1,
At this moment by rotating speed of target R0Reduce third preset value P3, obtaining R2Before, the supply voltage of power control module is recovered,
At this point, being equivalent to the load reduction of blower, the revolving speed of blower declines therewith, for example, rotating speed of target R0After reducing 150 turns,
The revolving speed of blower has dropped 100 turns, then R2-R0'=R1-100-(R0- 150)=R1-R0+ 50, it may be unsatisfactory for < 200 condition,
At this moment showing the adjustment numerical value of rotating speed of target is suitably, and secondary counting result not will increase, then triggers following recovery module
22；If in rotating speed of target R0After reducing 150 turns, the revolving speed of blower has dropped 155 turns, then R2-R0'=R1-155-(R0-
150)=R1-R0- 5, due to R1-R0< -200, then R1-R0- 5 < -200, at this point, showing that the adjustment numerical value of rotating speed of target is improper
, secondary counting result continues to increase, and when reaching setting value, executes step S23, S24, cuts off the control of power control module in time
Signal processed.
Second counting module 31 is also used to gradually reduce the rotating speed of target, and the sum of amount reduced every time is described the
Three preset values.Include:
First slowdown module 31A, in the first sub- period t1 of the initial time section T, the target to be turned
Fast R0Reduce the 6th preset value P4；
In one embodiment, initial time section T is 60 seconds, and the first sub- period t1 takes 0~30 second, then in power supply control mould
Block enters after overcurrent protection state in first 30 seconds, as rotating speed of target R0With the current rotating speed R of the DC faniDifference be greater than the
Two preset value P2When (such as 100 turns), while starting secondary counting, by rotating speed of target R0Reduce the 6th preset value P4；After reduction
Current rotating speed of target are as follows: R0-P4；That is Rule of judgment (current goal revolving speed R0With the current rotating speed R of the DC faniDifference
Greater than the second preset value P2) when whether meeting, it should it is judgement: Ri-(R0-P4) whether < -200.The sampling of blower current rotating speed
Continue according to sample frequency, if the current rotating speed of blower reduces after turning down according to above-mentioned 100 turns to rotating speed of target
101, above-mentioned condition meets, then carries out secondary counting, this explanation is smaller to the adjustment amplitude of rotating speed of target, needs more than 30 seconds
Afterwards, following step S21B is carried out；If being unsatisfactory for above-mentioned condition satisfaction, prove that the rotating speed of target of adjustment is suitable, energy
Enough appropriate revolving speeds for reducing blower, without triggering the second slowdown module 31B.
Second slowdown module 31B, for the 6th in the second sub- period t2 of the initial time section T, will to be reduced in advance
If value P4Rotating speed of target (the R afterwards0-P4) the 7th preset value P is reduced again5；The first sub- period t1 and described second
The sum of sub- period t1 is equal to the preset time period T, the 6th preset value P4With the 7th preset value P5The sum of be equal to institute
State third preset value P3；
In one embodiment, the second sub- period t2 takes 30~60 seconds, then enters overcurrent protection shape in power control module
In latter 30 seconds of state, the 6th preset value P will be reduced4Rotating speed of target (R afterwards0-P4) the 7th preset value P is reduced again5；After reduction
Current rotating speed of target are as follows: R0-P4-P5；That is Rule of judgment (current goal revolving speed R0With the current rotating speed R of the DC faniIt
Difference is greater than the second preset value P2) when whether meeting, it should it is judgement: Ri-(R0-P4-P5) whether < -200, if conditions are not met, then demonstrate,proving
The rotating speed of target of bright adjustment is suitably, can suitably to reduce the revolving speed of blower；If still met, can continue to reduce again
Rotating speed of target, or when first time selecting reduced amplitude larger, can trigger the second counting module of controller 21.
This programme, which essentially consists in, to be prevented once by the too big of the reduced range-adjusting of rotating speed of target, and directly cutting is to blower
Power supply, the normal operation for the control module that can not restore electricity can by way of gradually small magnitude adjustment using this programme
The probability for improving the control module normal operation that restores electricity, improves recovery rate.
Controller 2 further include:
Recovery module 22, for working as rotating speed of target R0And the difference of the current rotating speed of the DC fan is less than or equal to the
Two preset value P2When, after the initial time section T, according to current goal revolving speed (R0-P3) and DC fan work as forward
Fast Ri, by current goal revolving speed (R0-P3) revert to and do not reduce third preset value P3Rotating speed of target R before0。
It is suitable in the adjustment numerical value of above-mentioned rotating speed of target, secondary counting result will not in increased situation, in order to not influence
The normal operation of blower, it is also necessary to restore rotating speed of target to original value, in an embodiment of the present invention, in order to not influence wind
The overcurrent of machine takes the mode being gradually recovered, such as 10 turns of increase per second.
The recovery module 22 includes:
First recovery module 22A, in current goal revolving speed (R0-P3) and DC fan current rotating speed RiIt is all larger than
4th preset value P6When, current goal revolving speed (R0-P3) with the 4th preset value P6For radix, according to the second predeterminated frequency f2By
Secondary incremental mode is restored to not reducing third preset value P3Rotating speed of target R before0, wherein incremental increment is △ P；Working as
Preceding rotating speed of target (R0-P3) it is greater than the 4th preset value P6And the current rotating speed R of DC faniLess than the 4th preset value P6When, directly
By current goal revolving speed (R0-P3) it is set as the 4th preset value P6；Wherein incremental increment is that △ P takes 10 revolutions per seconds；Third is default
Value P3150 are taken, the 4th preset value P6900 are taken, in the case where 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, it is per second plus 10 turns, until restoring
To original rotating speed of target, such as original rotating speed of target is 1500 turns, then needs to revert to 1500 turns；Current rotating speed is lower than
At 880 turns, rotating speed of target temporary variable is 900 turns.
Second recovery module 22B, in current goal revolving speed (R0-P3) and DC fan current rotating speed RiBetween
Four preset value P6With the 5th preset value P7Between when, current goal revolving speed (R0-P3) with the 5th preset value P7For radix, according to
Second predeterminated frequency f2Gradually incremental mode is restored to not reducing third preset value P3Rotating speed of target R before0, wherein being incremented by
Increment be △ P；In current goal revolving speed (R0-P3) between the 4th preset value P6With the 5th preset value P7Between and DC fan
Current rotating speed RiLess than the 5th preset value P7When, directly by current goal revolving speed (R0-P3) it is set as the 5th preset value P7；Wherein
Incremental increment is that △ P takes 10 revolutions per seconds；5th preset value P7Take 600；In the case where rotating speed of target is higher than 600 turns, work as forward
For speed 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 lower than 580 turns, and rotating speed of target temporary variable is 600 turns.
Third recovery module 22C, in current goal revolving speed (R0-P3) less than the 5th preset value P7In the case where；Directly
By current goal revolving speed (R0-P3) be set as not reducing third preset value P3Rotating speed of target R before0；Wherein the described 4th is default
Value P6Greater than the 5th preset value P7.When current goal revolving speed is lower than 600 turns, directly reverting to does not reduce third preset value P3Before
Rotating speed of target R0。
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (8)
1. a kind of DC fan power control module guard method, which is characterized in that the DC fan power control module is protected
Maintaining method the following steps are included:
The revolving speed of DC fan is obtained according to the first predeterminated frequency；
It is default that difference of the statistics within a preset period of time between the last revolving speed obtained and the revolving speed currently obtained is greater than first
The number of value, and it is set as the first count value；
In the initial time section of the preset time period, when the difference of rotating speed of target and the revolving speed of the DC fan is greater than second
When preset value, first count value is carried out to add 1, and the rotating speed of target is reduced third preset value；
After the initial time section of the preset time period, be less than in the difference of rotating speed of target and the revolving speed of the DC fan or
It is according to current goal revolving speed and the revolving speed of the DC fan got, current goal revolving speed is extensive when equal to the second preset value
Multiple is the rotating speed of target not reduced before third preset value；
When the first count value is greater than the set value, the input control signal of power control module is closed, so that power control module
Inside power-off.
2. DC fan power control module guard method according to claim 1, which is characterized in that the DC fan
Power control module guard method further include:
When getting the current revolving speed of the DC fan, according to the size of revolving speed adjustment output to the power supply control
The input control signal of module, so that the power control module exports power supply of corresponding size according to the input control signal
Voltage is to the DC fan；
The input control signal for closing power control module specifically: the revolving speed for the DC fan that will acquire is set as 0.
3. DC fan power control module guard method according to claim 1, which is characterized in that described by the mesh
Mark revolving speed reduces third preset value
The rotating speed of target is gradually reduced, the sum of amount reduced every time is the third preset value.
4. DC fan power control module guard method according to claim 1 or 3, which is characterized in that described to work as
The rotating speed of target that preceding rotating speed of target reverts to before not reducing third preset value includes:
When the revolving speed of current goal revolving speed and DC fan is all larger than four preset values, current goal revolving speed is pre- with the described 4th
If value is radix, gradually it is incremented by the rotating speed of target restored to before not reducing third preset value；It is big in current goal revolving speed
When the current rotating speed of the 4th preset value and DC fan is less than four preset values, the 4th directly is set by current goal revolving speed
Preset value；
When the revolving speed of current goal revolving speed and DC fan is between the 4th preset value and the 5th preset value, current goal
Revolving speed is gradually incremented by the rotating speed of target restored to before not reducing third preset value using the 5th preset value as radix；
When current goal revolving speed is between the 4th preset value and the 5th preset value and the revolving speed of DC fan is less than five preset values,
Directly the 5th preset value is set by current goal revolving speed；
When current goal revolving speed is less than five preset values；Directly by current goal revolving speed be set as not reducing third preset value it
Preceding rotating speed of target；
Wherein the 4th preset value is greater than the 5th preset value.
5. a kind of DC fan power control module protective device, which is characterized in that the DC fan power control module is protected
Protection unit includes:
Acquisition module, for obtaining the revolving speed of DC fan according to the first predeterminated frequency；
First counting module, for counting the difference of the last revolving speed obtained and the revolving speed currently obtained within a preset period of time
Greater than the number of the first preset value, and it is set as the first count value；
Controller, for closing the input control signal of power supply module when the first count value is greater than the set value；So that for automatically controlled
Inside modules power-off processed；
Second counting module, in the initial time section of preset time period, in turning for rotating speed of target and the DC fan
When the difference of speed is greater than the second preset value, first count value is carried out to add 1, and rotating speed of target reduction third is preset
Value；
Recovery module, for after the initial time section of preset time period, in the revolving speed of rotating speed of target and the DC fan
Difference be less than or equal to the second preset value when, will be current according to current goal revolving speed and the revolving speed of the DC fan got
Rotating speed of target reverts to the rotating speed of target before not reducing third preset value.
6. DC fan power control module protective device according to claim 5, which is characterized in that
The controller is also used to be adjusted when getting the current revolving speed of the DC fan according to the size of the revolving speed
It exports to the input control signal of the power control module, so that the power control module is according to the input control signal
Supply voltage of corresponding size is exported to the DC fan；
When the first count value is greater than the set value, the revolving speed for the DC fan that will acquire is set as 0；So that in power control module
Portion's power-off.
7. DC fan power control module protective device according to claim 5, which is characterized in that described second counts
Module is also used to gradually reduce the rotating speed of target, and the sum of amount reduced every time is the third preset value.
8. the DC fan power control module protective device according to claim 5 or 7, which is characterized in that the recovery
Module includes:
First recovery module, for when the revolving speed of current goal revolving speed and DC fan is all larger than four preset values, current mesh
Revolving speed is marked using the 4th preset value as radix, is gradually incremented by the target restored to before not reducing third preset value and turns
Speed；When current goal revolving speed is greater than the revolving speed of the 4th preset value and DC fan less than four preset values, directly by current mesh
Mark revolving speed is set as the 4th preset value；
Second recovery module, for the revolving speed in current goal revolving speed and DC fan between the 4th preset value and the 5th preset value
Between when, current goal revolving speed is gradually incremented by and restores to before not reducing third preset value using the 5th preset value as radix
The rotating speed of target；Current goal revolving speed is between the 4th preset value and the 5th preset value and the revolving speed of DC fan is small
When five preset values, the 5th preset value directly is set by current goal revolving speed；
Third recovery module, for when current goal revolving speed is less than five preset values；Directly set current goal revolving speed to
The rotating speed of target before third preset value is not reduced；
Wherein the 4th preset value is greater than the 5th preset value.
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| CN108873806B (en) * | 2018-06-12 | 2021-07-09 | 四川省达州钢铁集团有限责任公司 | Double-core-rod control method |
| CN109412567A (en) * | 2018-12-28 | 2019-03-01 | 上海南芯半导体科技有限公司 | A kind of guard method of device for power switching failure process |
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| CN104236000B (en) * | 2013-06-17 | 2016-11-09 | 海尔集团公司 | A kind of outdoor fan of air-conditioner starts method |
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