CN110410346A - Fan speed regulation control method, system and electrical equipment - Google Patents
Fan speed regulation control method, system and electrical equipment Download PDFInfo
- Publication number
- CN110410346A CN110410346A CN201910669410.8A CN201910669410A CN110410346A CN 110410346 A CN110410346 A CN 110410346A CN 201910669410 A CN201910669410 A CN 201910669410A CN 110410346 A CN110410346 A CN 110410346A
- Authority
- CN
- China
- Prior art keywords
- time point
- signal
- angle position
- zero cross
- cycle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The invention discloses a kind of fan speed regulation control method, system and electrical equipments.The rising time point of zero cross signal and failing edge time point in AC signal of the present invention by obtaining input, and according to rising time point and the 90 ° of Angle Position time points and zero cross signal time point of calculating AC signal time cycle at failing edge time point；The feedback revolving speed of blower is obtained, and according to the opening time point of feedback revolving speed, 90 ° of Angle Position time points and zero cross signal time point adjustment conduction pulses, to realize fan speed regulation.The characteristics of wherein will not change according to the 90 of the AC signal time cycle ° of Angle Positions calculates real zero cross signal time point, the better reliability relative to traditional zero-crossing examination, it is not easy to the interference by noise signal；And the alternating voltage for reducing power grid moves up and down the influence generated to fan speed regulation, improves the precision of fan speed regulation.
Description
Technical field
The present invention relates to field of electromechanical technology more particularly to a kind of fan speed regulation control methods, system and electrical equipment.
Background technique
Blower is one of electrical equipment, such as the essential component part of air-conditioning, due to the direct shadow of the revolving speed of blower
Rung air output, and then affected the accuracy of temperature control and operation stability of electric appliance, thus in order to ensure electric appliance stable operation and
Temperature control precision, rotation speed of fan control must have good interference free performance.
Fan speed regulation usually detects zero cross signal time point by optocoupler by AC signal at present, then by control module
The revolving speed at the zero cross signal time point detected according to optocoupler and blower feedback, adjusts silicon-controlled or solid-state relay the angle of flow
Degree, so as to adjust the revolving speed of blower.But in practical applications, there are many disturbing factors during the revolving speed speed regulation of blower,
Such as due to the optocoupler conducting voltage that optocoupler generates when being connected and the synthesis for reducing the AC signal voltage that power consumption is promoted
It influences, not necessarily real zero cross signal time point at the zero cross signal time point that optocoupler detects, and due to disturbing factor
Presence cause fan speed regulation not accurate.
Summary of the invention
The main purpose of the present invention is to provide a kind of fan speed regulation control method, system and electrical equipments, it is intended to solve
Disturbing factor causes to adjust the speed not accurate technical problem when fan speed regulation in the prior art.
To achieve the above object, the present invention provides a kind of fan speed regulation control method, the described method comprises the following steps:
The rising time point of zero cross signal and failing edge time point in the AC signal of input are obtained, and according on described
When rising the 90 ° of Angle Position time points and the zero cross signal that calculate the AC signal time cycle along time point and the failing edge time point
Between point；
The feedback revolving speed of blower is obtained, and is believed according to the feedback revolving speed, 90 ° of Angle Position time points and the zero passage
The opening time point of number time point adjustment conduction pulses, to realize fan speed regulation.
Preferably, described that the AC signal time cycle is calculated according to the rising time point and the failing edge time point
90 ° of Angle Position time points and zero cross signal time point the step of, comprising:
It is obtained according to the rising time point and the failing edge time point and rises pulsewidth and decline pulsewidth；
AC signal frequency and the AC signal time cycle are calculated according to the rising pulsewidth and the decline pulsewidth
90 ° of Angle Position time points；
Zero cross signal time point is obtained according to 90 ° of Angle Position time points and the AC signal frequency.
Preferably, described that the AC signal time cycle is calculated according to the rising pulsewidth and the decline pulsewidth
The step of 90 ° of Angle Position time points, comprising:
90 ° of Angle Position time points of positive half period of the AC signal are calculated according to the rising pulsewidth；
90 ° of Angle Position time points of negative half-cycle of the AC signal are calculated according to the decline pulsewidth.
Preferably, described that the zero cross signal time is obtained according to 90 ° of Angle Position time points and the AC signal frequency
The step of point, comprising:
When entering the positive half period according to 90 ° of Angle Position time points of the positive half period and AC signal frequency acquisition
Zero cross signal time point；
When entering the negative half-cycle according to 90 ° of Angle Position time points of the negative half-cycle and AC signal frequency acquisition
Zero cross signal time point.
Preferably, the feedback revolving speed for obtaining blower, and according to the feedback revolving speed, 90 ° of Angle Position time points
And the zero cross signal time point adjusts the step of opening time point of conduction pulses, comprising:
When detecting 90 ° of Angle Position time points of positive half period, the first feedback revolving speed of blower is obtained, and according to institute
State the first feedback revolving speed, 90 ° of Angle Position time points of the positive half period and zero cross signal time point adjustment conduction pulses
Opening time point；
When detecting 90 ° of Angle Position time points of negative half-cycle, the second feedback revolving speed of blower is obtained, and according to institute
State the second feedback revolving speed, 90 ° of Angle Position time points of the negative half-cycle and zero cross signal time point adjustment conduction pulses
Opening time point.
Preferably, described according to the first feedback revolving speed, 90 ° of Angle Position time points of the positive half period and the zero passage
Signal time point adjusts the step of opening time point of conduction pulses, comprising:
When the first feedback revolving speed is less than rotating speed of target, the opening time point of conduction pulses is adjusted to current exchange
Between 90 ° of Angle Position time points of the positive half period and the entrance positive half period zero cross signal time point in signal time period；
When the first feedback revolving speed is greater than rotating speed of target, the opening time point of conduction pulses is adjusted to current exchange
Between 90 ° of Angle Position time points of the positive half period and the entrance negative half-cycle zero cross signal time point in signal time period.
Preferably, described according to the second feedback revolving speed, 90 ° of Angle Position time points of the negative half-cycle and the zero passage
Signal time point adjusts the step of opening time point of conduction pulses, comprising:
When the second feedback revolving speed is less than rotating speed of target, the opening time point of conduction pulses is adjusted to described current
Between the 90 ° of Angle Position time points of negative half-cycle and the entrance negative half-cycle zero cross signal time point of AC signal time cycle；
When the second feedback revolving speed is greater than rotating speed of target, the opening time point of conduction pulses is adjusted to described current
Enter positive half period in 90 ° of Angle Position time points of negative half-cycle of AC signal time cycle and next AC signal time cycle
Between zero cross signal time point.
Preferably, described according to the feedback revolving speed, 90 ° of Angle Position time points and the zero cross signal time point tune
The opening time point of whole conduction pulses, the step of to realize fan speed regulation after, the method also includes:
Judge whether the electronic power switch device for receiving conduction pulses disconnects；
Whether when the electronic power switch device disconnects, detecting in the AC signal has interference signal；
If so, the end time point in the interference signal issues conduction pulses, so that electronic power switch break-over of device.
In addition, to achieve the above object, the present invention also provides a kind of fan speed regulation control system, the fan speed regulation control
System includes:
Zero crossing obtains module, the rising time point and failing edge of zero cross signal in the AC signal for detecting input
Time point；
Control module, for calculating week AC signal time according to the rising time point and the failing edge time point
90 ° of Angle Position time points of phase and zero cross signal time point；
The control module is also used to obtain the feedback revolving speed of blower, and according to the feedback revolving speed, 90 ° of angles position
The opening time point at time point and zero cross signal time point adjustment conduction pulses is set, to realize fan speed regulation.
In addition, to achieve the above object, the present invention also provides a kind of electrical equipment, the electrical equipment includes blower and wind
Machine speed-adjusting and control system realizes such as blower described in any item of the claim 1 to 8 when the fan speed regulation control system executes
The step of method for controlling speed regulation or the fan speed regulation control system are configured as fan speed regulation as claimed in claim 9
Control system.
The rising time point of zero cross signal and failing edge time point in AC signal of the present invention by obtaining input, and
90 ° of Angle Position time points and the zero cross signal of AC signal time cycle are calculated according to rising time point and failing edge time point
Time point；Then by obtaining the feedback revolving speed of blower, and according to feedback revolving speed, 90 ° of Angle Position time points and when zero cross signal
Between point adjustment conduction pulses opening time point, to realize fan speed regulation.Wherein according to the 90 of the AC signal time cycle ° of angles position
Setting the characteristics of will not change calculates real zero cross signal time point, relative to the better reliability of traditional zero-crossing examination,
It is not readily susceptible to the interference of noise signal；And the alternating voltage for reducing power grid moves up and down the shadow generated to fan speed regulation
It rings, improves the precision of fan speed regulation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of blower speed-adjusting and control system in electrical equipment that the embodiment of the present invention is related to；
Fig. 2 is the flow diagram of fan speed regulation control method first embodiment of the present invention；
Fig. 3 is AC signal and the conversion signal after light-coupled isolation in fan speed regulation control method first embodiment of the present invention
Corresponding relationship；
Fig. 4 is the flow diagram of fan speed regulation control method second embodiment of the present invention；
Fig. 5 is interference signal in fan speed regulation control method second embodiment of the present invention in the rising pulses of AC signal
The realization principle figure of conduction pulses when appearance；
Fig. 6 is interference signal in fan speed regulation control method second embodiment of the present invention in the falling pulse of AC signal
The realization principle figure of conduction pulses when appearance；
Fig. 7 is the functional block diagram of one embodiment of fan speed regulation control system 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.
Referring to Fig.1, Fig. 1 is the electrical equipment structural schematic diagram for the hardware running environment that the embodiment of the present invention is related to.
As shown in Figure 1, the electrical equipment may include: processor 1001, such as CPU, communication bus 1002, user interface
1003, network interface 1004, memory 1005.Wherein, communication bus 1002 is for realizing the connection communication between these components.
User interface 1003 may include display screen (Display), input unit such as keyboard (Keyboard), optional user interface
1003 can also include standard wireline interface and wireless interface.Network interface 1004 optionally may include that the wired of standard connects
Mouth, wireless interface (such as WI-FI interface).Memory 1005 can be high speed RAM memory, be also possible to stable memory
(non-volatile memory), such as magnetic disk storage.Memory 1005 optionally can also be independently of aforementioned processor
1001 storage device.
It will be understood by those skilled in the art that structure shown in Fig. 1 does not constitute the restriction to electrical equipment, can wrap
It includes than illustrating more or fewer components, perhaps combines certain components or different component layouts.
As shown in Figure 1, as may include that operating system, network are logical in a kind of memory 1005 of computer storage medium
Believe that module, Subscriber Interface Module SIM and fan speed regulation control program.
In electrical equipment shown in Fig. 1, network interface 1004 is mainly used for carrying out data communication with external network；User
Interface 1003 is mainly used for receiving the input instruction of user；The electrical equipment is called in memory 1005 by processor 1001
The fan speed regulation of storage controls program, and executes following operation:
The rising time point of zero cross signal and failing edge time point in the AC signal of input are obtained, and according on described
Rise 90 ° of Angle Position time points and the zero passage letter that the AC signal time cycle is calculated along time point and the failing edge time point
Number time point；
The feedback revolving speed of blower is obtained, and is believed according to the feedback revolving speed, 90 ° of Angle Position time points and the zero passage
The opening time point of number time point adjustment conduction pulses, to realize fan speed regulation.
Further, processor 1001 can call the fan speed regulation stored in memory 1005 to control program, also execute
It operates below:
It is obtained according to the rising time point and the failing edge time point and rises pulsewidth and decline pulsewidth；
AC signal frequency and the AC signal time cycle are calculated according to the rising pulsewidth and the decline pulsewidth
90 ° of Angle Position time points；
Zero cross signal time point is obtained according to 90 ° of Angle Position time points and the AC signal frequency.
Further, processor 1001 can call the fan speed regulation stored in memory 1005 to control program, also execute
It operates below:
90 ° of Angle Position time points of positive half period of the AC signal are calculated according to the rising pulsewidth；
90 ° of Angle Position time points of negative half-cycle of the AC signal are calculated according to the decline pulsewidth.
Further, processor 1001 can call the fan speed regulation stored in memory 1005 to control program, also execute
It operates below:
When entering the positive half period according to 90 ° of Angle Position time points of the positive half period and AC signal frequency acquisition
Zero cross signal time point；
When entering the negative half-cycle according to 90 ° of Angle Position time points of the negative half-cycle and AC signal frequency acquisition
Zero cross signal time point.
Further, processor 1001 can call the fan speed regulation stored in memory 1005 to control program, also execute
It operates below:
When detecting 90 ° of Angle Position time points of positive half period, the first feedback revolving speed of blower is obtained, and according to institute
State the first feedback revolving speed, 90 ° of Angle Position time points of the positive half period and zero cross signal time point adjustment conduction pulses
Opening time point；
When detecting 90 ° of Angle Position time points of negative half-cycle, the second feedback revolving speed of blower is obtained, and according to institute
State the second feedback revolving speed, 90 ° of Angle Position time points of the negative half-cycle and zero cross signal time point adjustment conduction pulses
Opening time point.
Further, processor 1001 can call the fan speed regulation stored in memory 1005 to control program, also execute
It operates below:
When the first feedback revolving speed is less than rotating speed of target, the opening time point of conduction pulses is adjusted to current exchange
Between 90 ° of Angle Position time points of the positive half period and the entrance positive half period zero cross signal time point in signal time period；
When the first feedback revolving speed is greater than rotating speed of target, the opening time point of conduction pulses is adjusted to current exchange
Between 90 ° of Angle Position time points of the positive half period and the entrance negative half-cycle zero cross signal time point in signal time period.
Further, processor 1001 can call the fan speed regulation stored in memory 1005 to control program, also execute
It operates below:
When the second feedback revolving speed is less than rotating speed of target, the opening time point of conduction pulses is adjusted to described current
Between the 90 ° of Angle Position time points of negative half-cycle and the entrance negative half-cycle zero cross signal time point of AC signal time cycle；
When the second feedback revolving speed is greater than rotating speed of target, the opening time point of conduction pulses is adjusted to described current
Enter positive half period in 90 ° of Angle Position time points of negative half-cycle of AC signal time cycle and next AC signal time cycle
Between zero cross signal time point.
Further, processor 1001 can call the fan speed regulation stored in memory 1005 to control program, also execute
It operates below:
Judge whether the electronic power switch device for receiving conduction pulses disconnects；
Whether when the electronic power switch device disconnects, detecting in the AC signal has interference signal；
If so, the end time point in the interference signal issues conduction pulses, so that electronic power switch break-over of device.
The present embodiment through the above scheme, by obtain input AC signal in zero cross signal rising time point and
Failing edge time point, and according to rising time point and 90 ° of Angle Positions of calculating AC signal time cycle at failing edge time point
Time point and zero cross signal time point；Then by obtain blower feedback revolving speed, and according to feedback revolving speed, 90 ° of Angle Positions when
Between put and zero cross signal time point adjustment conduction pulses opening time point, to realize fan speed regulation.Wherein according to AC signal
The characteristics of 90 ° of Angle Positions of time cycle will not change calculates real zero cross signal time point, relative to traditional zero crossing
The better reliability of detection, it is not easy to the interference by noise signal；And the alternating voltage for reducing power grid moves up and down pair
The influence that fan speed regulation generates, improves the precision of fan speed regulation.
Based on above-mentioned hardware configuration, each embodiment of fan speed regulation control method of the present invention is proposed.
It is the flow diagram of fan speed regulation control method first embodiment of the present invention referring to Fig. 2, Fig. 2.
In the first embodiment, the fan speed regulation control method the following steps are included:
S10: rising time point and the failing edge time point of zero cross signal in the AC signal of input are obtained, and according to institute
It states rising time point and the failing edge time point calculates 90 ° of Angle Position time points and the mistake of the AC signal time cycle
Zero-signal time point；
It should be noted that AC signal can be regarded as the ac voltage signal in power grid, zero cross signal is interpreted as exchanging
Signal at the time of signal amplitude is zero (positive and negative conversion), the detection of zero cross signal time point is usually straight by optocoupler in the prior art
It connects detection, but the optocoupler conducting voltage by generating when optocoupler conducting and optocoupler is connected for reduce that power consumption promoted
The combined influence of AC signal voltage, not necessarily real zero cross signal time at the zero cross signal time point that optocoupler detects
Point.Rising time point and failing edge time point of the present embodiment by zero cross signal in detection AC signal, then calculate true
Positive zero cross signal time point.
Specifically, obtain zero cross signal time point process can be obtain input AC signal in zero cross signal it is upper
It rises along time point and failing edge time point, and is obtained according to the rising time point and the failing edge time point and rise pulsewidth
And decline pulsewidth；AC signal frequency and the week AC signal time are calculated according to the rising pulsewidth and the decline pulsewidth
90 ° of Angle Position time points of phase；The zero cross signal time is obtained according to 90 ° of Angle Position time points and the AC signal frequency
Point.
Please together referring to Fig. 3, in the present embodiment, it is as follows to obtain the detailed step at zero cross signal time point:
Step 1, the rising edge for detecting zero cross signal, and record current time t0 (rising time point)；
Step 2, the failing edge for detecting zero cross signal, and record current time t1 (failing edge time point)；
Step 3 calculates rising pulsewidth (i.e. high level period time) according to t0 and t1, is greater than default minimum when rising pulsewidth
When high pulse width A, if rising pulsewidth is Th；
The rising edge of step 4, the next zero cross signal of detection, and record current time t2 (next rising time point)；
Step 5 calculates decline pulsewidth (i.e. low-level period time) according to t2 and t1, when decline pulsewidth is greater than default minimum
When low-level pulse width B, setting drop pulsewidth is Tl, and calculates Tx=Th+Tl between ac signal cycle；
Step 6,90 ° of Angle Position time points of positive half period that the AC signal is calculated according to the rising pulsewidth Th
Th90, wherein Th90=1/2Th；
Step 7,90 ° of Angle Position time points of negative half-cycle that the AC signal is calculated according to the decline pulsewidth Tl
Tl90, wherein Tl90=1/2Tl；
Step 8 calculates AC signal frequency 1/Tx according to the rising pulsewidth Th and decline pulsewidth Tl；
Step 9, according to the positive half period 90 ° of Angle Position time point Th90 and the AC signal frequency 1/Tx obtain into
Enter the zero cross signal time point TH0 when positive half period, wherein TH0=Th90-1/4Tx；
Step 10 is obtained according to the negative half-cycle 90 ° of Angle Position time point Tl90 and the AC signal frequency 1/Tx
Zero cross signal time point TL0 when into the negative half-cycle, wherein TL0=Tl90-1/4Tx.
The present embodiment passes through rising pulsewidth and decline arteries and veins by real-time detection rising time point and failing edge time point
Width calculates real zero cross signal time point, can be compatible with not only for the AC signal frequency of country variant power grid；And
The detection cycle of zero-crossing examination in compared with the existing technology, the present embodiment is longer, the better reliability of detection, it is not easy to receive
It to the interference of noise signal, is moved up and down even if the alternating current of power grid is pressed with, since 90 ° of Angle Position phases of AC signal will not
Variation, will not have an impact fan speed regulation.
S20: the feedback revolving speed of blower is obtained, and according to the feedback revolving speed, 90 ° of Angle Position time points and the mistake
Zero-signal time point adjusts the opening time point of conduction pulses, to realize fan speed regulation.
It should be noted that electronic power switch device can be the devices such as silicon-controlled or solid-state relay, the present embodiment
It is without restriction to this.Correspondingly, conduction pulses refer to that correspondence is used to open silicon-controlled or solid-state relay conduction pulses.
It should be understood that the opening time point of conduction pulses determines that power electronics is opened during fan speed regulation
The angle of flow of device is closed, blower is according to angle of flow and conducting pulse-width regulated revolving speed.
Specifically, when detecting 90 ° of Angle Position time point Th90 of the positive half period, the first feedback for obtaining blower turns
Speed, and according to the first feedback revolving speed, 90 ° of Angle Position time point Th90 of the positive half period and the zero cross signal time point
Adjust the opening time point of conduction pulses.
Wherein, when the feedback revolving speed is less than rotating speed of target, the opening time point of conduction pulses is adjusted to current and is handed over
It flows 90 ° of Angle Position time point Th90 of the positive half period in signal time period and enters the positive half period zero cross signal time point
Between TH0, i.e. the opening point of control and regulation electronic power switch device moves forward, to increase electronic power switch device
Angle of flow increases current rotation speed of fan.
When the feedback revolving speed is greater than rotating speed of target, the opening time point of conduction pulses is adjusted to current AC signal
90 ° of Angle Position time point Th90 of the positive half period of time cycle and enter negative half-cycle zero cross signal time point TL0 it
Between, i.e. the opening point of control and regulation electronic power switch device moves backward, to reduce the conducting of electronic power switch device
Angle reduces current rotation speed of fan.
Specifically, when detecting 90 ° of Angle Position time point Tl90 of the negative half-cycle, the second feedback for obtaining blower turns
Speed, and according to the second feedback revolving speed, 90 ° of Angle Position time point Tl90 of the negative half-cycle and the zero cross signal time point
Adjust the opening time point of conduction pulses.
Wherein, when the feedback revolving speed is less than rotating speed of target, the opening time point of conduction pulses is adjusted to described and is worked as
When 90 ° of Angle Position time point Tl90 of the negative half-cycle of preceding AC signal time cycle are with the negative half-cycle zero cross signal is entered
Between between point TL0, i.e. the opening point of control and regulation electronic power switch device moves forward, to increase electronic power switch device
The angle of flow of part increases current rotation speed of fan.
When the feedback revolving speed is greater than rotating speed of target, the opening time point of conduction pulses is adjusted to the current exchange
90 ° of Angle Position time point Tl90 of negative half-cycle in signal time period and enter positive half period in next AC signal time cycle
Between zero cross signal time point TH0 ', i.e. the opening point of control and regulation electronic power switch device moves backward, to reduce electricity
The angle of flow of power electronic switching device reduces current rotation speed of fan.
The rising time point of zero cross signal and failing edge time point in AC signal of the present embodiment by obtaining input,
And 90 ° of Angle Position time points and the zero passage letter of AC signal time cycle is calculated according to rising time point and failing edge time point
Number time point；Then by obtaining the feedback revolving speed of blower, and according to feedback revolving speed, 90 ° of Angle Position time points and zero cross signal
Time point adjusts the opening time point of conduction pulses, to realize fan speed regulation.Wherein according to the 90 of the AC signal time cycle ° of angles
The characteristics of position will not change calculates real zero cross signal time point, and the reliability relative to traditional zero-crossing examination is more
It is good, it is not easy to the interference by noise signal；And the alternating voltage for reducing power grid is moved up and down to fan speed regulation generation
It influences, improves the precision of fan speed regulation.
Further, as shown in figure 4, proposing that fan speed regulation control method second of the present invention is implemented based on first embodiment
Example, in the present embodiment, after step S20, the method also includes following steps:
S30: judge whether the electronic power switch device for receiving conduction pulses disconnects；
It should be understood that the application scenarios due to electrical equipment are different, under rugged environment, it will receive in power grid and do
The influence of signal or Voltage Drop is disturbed, so that the improper closing of electronic power switch device, causes the effective turn-on time of the device
It reduces, leads to fan stall.Therefore, after electronic power switch break-over of device, it is also necessary to judge whether it disconnects.
S40: whether when the electronic power switch device disconnects, detecting in the AC signal has interference signal；
It is understood that can be using detection interference signal pulsewidth due to the general pulsewidth very little of interference signal
It is no to be less than preset value N to determine whether there is interference signal in AC signal, when a certain signal pulsewidth in AC signal is less than N
When, determine that there is interference signal in AC signal.Certainly, the determination method of interference signal can also use other methods, this reality
It is without restriction to this to apply example.
S50: if so, the end time point in the interference signal issues the conduction pulses, so that electronic power switch
Break-over of device.
Please with reference to Fig. 5 and Fig. 6, Fig. 5 is that arteries and veins is connected when interference signal occurs in the rising pulses of AC signal
The schematic diagram that punching is added will not issue conduction pulses when occurring interference signal in the rising pulses for detecting AC signal, electricity
Power electronic switching device will disconnect, it is therefore desirable at the end of disturbing pulse, be again turned on the conducting of electronic power switch device
Pulse, so that electronic power switch device is connected again.Fig. 6 is when interference signal occurs in the falling pulse of AC signal
When, the schematic diagram that conduction pulses are added will not be issued and be led when occurring interference signal in the falling pulse for detecting AC signal
It promotes blood circulation punching, electronic power switch device will disconnect, it is therefore desirable at the end of disturbing pulse, be again turned on electronic power switch device
The conduction pulses of part, so that electronic power switch device is connected again.
The present embodiment, which passes through, judges whether the electronic power switch device for receiving conduction pulses disconnects；In the power electronics
Whether when switching device disconnects, detecting in the AC signal has interference signal；If so, the interference signal at the end of
Between point issue the conduction pulses so that electronic power switch break-over of device, effectively prevents interference signal occur or voltage falls
It causes electronic power switch device to close when falling, avoids blower and stall event occur, the anti-interference of Fan Regulation has been turned up
Energy.
The present invention further provides a kind of fan speed regulation control systems.
It is the functional block diagram of one embodiment of fan speed regulation control system of the present invention referring to Fig. 7, Fig. 7.
In the present embodiment, the fan speed regulation control system includes:
Zero crossing obtains module 10, the rising time point of zero cross signal and decline in the AC signal for detecting input
Along time point；
Control module 20, for calculating the AC signal time according to the rising time point and the failing edge time point
90 ° of Angle Position time points in period and zero cross signal time point；
The control module 20 is also used to obtain the feedback revolving speed of blower, and according to the feedback revolving speed, 90 ° of angles
The opening time point of position time point and zero cross signal time point adjustment conduction pulses, to realize fan speed regulation.
It should be noted that AC signal can be regarded as the ac voltage signal in power grid, zero cross signal is interpreted as exchanging
Signal at the time of signal amplitude is zero (positive and negative conversion), the detection of zero cross signal time point is usually straight by optocoupler in the prior art
It connects detection, but the optocoupler conducting voltage by generating when optocoupler conducting and optocoupler is connected for reduce that power consumption promoted
The combined influence of AC signal voltage, not necessarily real zero cross signal time at the zero cross signal time point that optocoupler detects
Point.Rising time point and failing edge time point of the present embodiment by zero cross signal in detection AC signal, then calculate true
Positive zero cross signal time point.
Wherein, it may include unidirectional optocoupler that zero crossing, which obtains module 10, when AC signal is in positive half period and reaches single
When to optocoupler cut-in voltage, unidirectional optocoupler is opened, and the rising edge level of open signal is transferred to control module 20, and unidirectional
After optocoupler is opened, high level is transferred to control module 20；
When AC signal is in negative half-cycle or unidirectional optocoupler cut-in voltage is not achieved, unidirectional optocoupler is closed, and will be closed
The failing edge level of signal is transferred to control module 20, and after the closing of unidirectional optocoupler, low level is transferred to control module 20.
Alternatively, when AC signal is in positive half period and reaches unidirectional optocoupler cut-in voltage, when unidirectional optocoupler is opened,
Failing edge is transferred to control module 20 after reverse isolation by open signal, and after the unlatching of unidirectional optocoupler, open signal is passed through
Low level after reverse isolation is transferred to control module 20.
When ac voltage signal is in negative half-cycle or unidirectional optocoupler cut-in voltage is not achieved, unidirectional optocoupler is closed, and is closed
It closes signal and rising edge is transferred to control module 20 after reverse isolation, and after the closing of unidirectional optocoupler, by shutdown signal through anti-
Control module 20 is transferred to the high level after isolation.
Further, the fan speed regulation control system includes: alternating voltage input module 30, drive module 40 and feedback
Module 60；Wherein,
The alternating voltage input module 30 obtains module 10 with the zero crossing and connect, and for receiving alternating voltage, produces
Raw AC signal simultaneously sends the AC signal to zero crossing acquisition module 10；
The drive module 40, including electronic power switch device, the drive module 40 and the control module 20 and
Blower fan module 50 is separately connected, the opening time point sent for receiving the control module 20, according to the opening time point
The angle of flow of electronic power switch device is adjusted, and sends driving signal to the blower fan module 50, so that blower fan module 50
The driving signal is received, and adjusts the revolving speed size of blower according to the driving signal；
The feedback module 60 is connect with the control module 20 and blower fan module 50, anti-for receiving blower fan module 50
The rotary speed detecting signal of feedback, and the rotary speed detecting signal is sent to the control module 20, so that the control module 20
The opening time point is adjusted according to the rotary speed detecting signal.
Based on above-mentioned hardware configuration, control module 20, the process for obtaining zero cross signal time point, which can be, obtains input
The rising time point of zero cross signal and failing edge time point in AC signal, according to the rising time point and the decline
It is obtained along time point and rises pulsewidth (i.e. high level period time) and decline pulsewidth (i.e. low-level period time)；On described
It rises pulsewidth and the decline pulsewidth calculates AC signal frequency and 90 ° of Angle Position time points of the AC signal time cycle；
Zero cross signal time point is obtained according to 90 ° of Angle Position time points and the AC signal frequency.
The detailed step for obtaining zero cross signal time point is as follows:
Step 1, the rising edge for detecting zero cross signal, and record current time t0 (rising time point)；
Step 2, the failing edge for detecting zero cross signal, and record current time t1 (failing edge time point)；
Step 3 calculates rising pulsewidth according to t0 and t1, when rising pulsewidth greater than default minimum high pulse width A, if on
Rising pulsewidth is Th；
The rising edge of step 4, the next zero cross signal of detection, and record current time t2 (next rising time point)；
Step 5 calculates decline pulsewidth according to t2 and t1, when declining pulsewidth greater than default minimum low-level pulse width B, sets
Drop pulsewidth is Tl, and calculates Tx=Th+Tl between ac signal cycle；
Step 6,90 ° of Angle Position time points of positive half period that the AC signal is calculated according to the rising pulsewidth Th
Th90, wherein Th90=1/2Th；
Step 7,90 ° of Angle Position time points of negative half-cycle that the AC signal is calculated according to the decline pulsewidth Tl
Tl90, wherein Tl90=1/2Tl；
Step 8 calculates AC signal frequency 1/Tx according to the rising pulsewidth Th and decline pulsewidth Tl；
Step 9, according to the positive half period 90 ° of Angle Position time point Th90 and the AC signal frequency 1/Tx obtain into
Enter the zero cross signal time point TH0 when positive half period, wherein TH0=Th90-1/4Tx；
Step 10 is obtained according to the negative half-cycle 90 ° of Angle Position time point Tl90 and the AC signal frequency 1/Tx
Zero cross signal time point TL0 when into the negative half-cycle, wherein TL0=Tl90-1/4Tx.
The present embodiment passes through rising pulsewidth and decline arteries and veins by real-time detection rising time point and failing edge time point
Width calculates real zero cross signal time point, can be compatible with not only for the AC signal frequency of country variant power grid；And
The detection cycle of zero-crossing examination in compared with the existing technology, the present embodiment is longer, the better reliability of detection, it is not easy to receive
It to the interference of noise signal, is moved up and down even if the alternating current of power grid is pressed with, since 90 ° of Angle Position phases of AC signal will not
Variation, will not have an impact fan speed regulation.
It should be noted that electronic power switch device can be the devices such as silicon-controlled or solid-state relay, the present embodiment
It is without restriction to this.Correspondingly, conduction pulses refer to that correspondence is used to open silicon-controlled or solid-state relay conduction pulses.
It should be understood that the opening time point of conduction pulses determines that power electronics is opened during fan speed regulation
The angle of flow of device is closed, blower is according to angle of flow and conducting pulse-width regulated revolving speed.
Specifically, when detecting 90 ° of Angle Position time point Th90 of the positive half period, the first feedback for obtaining blower turns
Speed, and according to the first feedback revolving speed, 90 ° of Angle Position time point Th90 of the positive half period and the zero cross signal time point
Adjust the opening time point of conduction pulses.
Wherein, when the feedback revolving speed is less than rotating speed of target, the opening time point of conduction pulses is adjusted to current and is handed over
It flows 90 ° of Angle Position time point Th90 of the positive half period in signal time period and enters the positive half period zero cross signal time point
Between TH0, i.e. the opening point of control and regulation electronic power switch device moves forward, to increase electronic power switch device
Angle of flow increases current rotation speed of fan.
When the feedback revolving speed is greater than rotating speed of target, the opening time point of conduction pulses is adjusted to current AC signal
90 ° of Angle Position time point Th90 of the positive half period of time cycle and enter negative half-cycle zero cross signal time point TL0 it
Between, i.e. the opening point of control and regulation electronic power switch device moves backward, to reduce the conducting of electronic power switch device
Angle reduces current rotation speed of fan.
Specifically, when detecting 90 ° of Angle Position time point Tl90 of the negative half-cycle, the second feedback for obtaining blower turns
Speed, and according to the second feedback revolving speed, 90 ° of Angle Position time point Tl90 of the negative half-cycle and the zero cross signal time point
Adjust the opening time point of conduction pulses.
Wherein, when the feedback revolving speed is less than rotating speed of target, the opening time point of conduction pulses is adjusted to described and is worked as
When 90 ° of Angle Position time point Tl90 of the negative half-cycle of preceding AC signal time cycle are with the negative half-cycle zero cross signal is entered
Between between point TL0, i.e. the opening point of control and regulation electronic power switch device moves forward, to increase electronic power switch device
The angle of flow of part increases current rotation speed of fan.
When the feedback revolving speed is greater than rotating speed of target, the opening time point of conduction pulses is adjusted to the current exchange
90 ° of Angle Position time point Tl90 of negative half-cycle in signal time period and enter positive half period in next AC signal time cycle
Between zero cross signal time point TH0 ', i.e. the opening point of control and regulation electronic power switch device moves backward, to reduce electricity
The angle of flow of power electronic switching device reduces current rotation speed of fan.
The rising time point of zero cross signal and failing edge time point in AC signal of the present embodiment by obtaining input,
And 90 ° of Angle Position time points and the zero passage letter of AC signal time cycle is calculated according to rising time point and failing edge time point
Number time point；Then by obtaining the feedback revolving speed of blower, and according to feedback revolving speed, 90 ° of Angle Position time points and zero cross signal
Time point adjusts the opening time point of conduction pulses, to realize fan speed regulation.Wherein according to the 90 of the AC signal time cycle ° of angles
The characteristics of position will not change calculates real zero cross signal time point, and the reliability relative to traditional zero-crossing examination is more
It is good, it is not easy to the interference by noise signal；And the alternating voltage for reducing power grid is moved up and down to fan speed regulation generation
It influences, improves the precision of fan speed regulation.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or system.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in one as described above
In storage medium (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that terminal device (it can be mobile phone,
Computer, server, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
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 (10)
1. a kind of fan speed regulation control method, which is characterized in that the fan speed regulation control method the following steps are included:
The rising time point of zero cross signal and failing edge time point in the AC signal of input are obtained, and according to the rising edge
Time point and the failing edge time point calculate the 90 ° of Angle Position time points and zero cross signal time of AC signal time cycle
Point；
The feedback revolving speed of blower is obtained, and when according to the feedback revolving speed, 90 ° of Angle Position time points and the zero cross signal
Between point adjustment conduction pulses opening time point, to realize fan speed regulation.
2. fan speed regulation control method as described in claim 1, which is characterized in that it is described according to the rising time point and
The failing edge time point calculates the step of 90 ° of Angle Position time points and zero cross signal time point of AC signal time cycle,
Include:
It is obtained according to the rising time point and the failing edge time point and rises pulsewidth and decline pulsewidth；
90 ° of AC signal frequency and the AC signal time cycle are calculated according to the rising pulsewidth and the decline pulsewidth
Angle Position time point；
Zero cross signal time point is obtained according to 90 ° of Angle Position time points and the AC signal frequency.
3. fan speed regulation control method as claimed in claim 2, which is characterized in that described according to the rising pulsewidth and described
The step of decline pulsewidth calculates 90 ° of Angle Position time points of the AC signal time cycle, comprising:
90 ° of Angle Position time points of positive half period of the AC signal are calculated according to the rising pulsewidth；
90 ° of Angle Position time points of negative half-cycle of the AC signal are calculated according to the decline pulsewidth.
4. fan speed regulation control method as claimed in claim 3, which is characterized in that described according to 90 ° of Angle Position time
The step of point and the AC signal frequency obtain zero cross signal time point, comprising:
Mistake when entering the positive half period is obtained according to 90 ° of Angle Position time points of the positive half period and the AC signal frequency
Zero-signal time point；
Mistake when entering the negative half-cycle is obtained according to 90 ° of Angle Position time points of the negative half-cycle and the AC signal frequency
Zero-signal time point.
5. fan speed regulation control method as claimed in claim 4, which is characterized in that the feedback revolving speed for obtaining blower, and
When according to the unlatching of the feedback revolving speed, 90 ° of Angle Position time points and zero cross signal time point adjustment conduction pulses
Between put the step of, comprising:
When detecting 90 ° of Angle Position time points of positive half period, the first feedback revolving speed of blower is obtained, and according to described the
The unlatching of one feedback revolving speed, 90 ° of Angle Position time points of the positive half period and zero cross signal time point adjustment conduction pulses
Time point；
When detecting 90 ° of Angle Position time points of negative half-cycle, the second feedback revolving speed of blower is obtained, and according to described the
The unlatching of two feedback revolving speeds, 90 ° of Angle Position time points of the negative half-cycle and zero cross signal time point adjustment conduction pulses
Time point.
6. fan speed regulation control method as claimed in claim 5, which is characterized in that it is described according to it is described first feedback revolving speed,
The step of the opening time point of 90 ° of Angle Position time points of the positive half period and zero cross signal time point adjustment conduction pulses
Suddenly, comprising:
When the first feedback revolving speed is less than rotating speed of target, the opening time point of conduction pulses is adjusted to current AC signal
Between the 90 ° of Angle Position time points of the positive half period and the entrance positive half period zero cross signal time point of time cycle；
When the first feedback revolving speed is greater than rotating speed of target, the opening time point of conduction pulses is adjusted to current AC signal
Between the 90 ° of Angle Position time points of the positive half period and the entrance negative half-cycle zero cross signal time point of time cycle.
7. fan speed regulation control method as claimed in claim 5, which is characterized in that it is described according to it is described second feedback revolving speed,
The step of the opening time point of 90 ° of Angle Position time points of the negative half-cycle and zero cross signal time point adjustment conduction pulses
Suddenly, comprising:
When the second feedback revolving speed is less than rotating speed of target, the opening time point of conduction pulses is adjusted to the current exchange
Between 90 ° of Angle Position time points of negative half-cycle and the entrance negative half-cycle zero cross signal time point in signal time period；
When the second feedback revolving speed is greater than rotating speed of target, the opening time point of conduction pulses is adjusted to the current exchange
Enter positive half period zero passage in 90 ° of Angle Position time points of negative half-cycle in signal time period and next AC signal time cycle
Between signal time point.
8. the fan speed regulation control method as described in any one of claims 1 to 7, which is characterized in that described according to described anti-
The opening time point of revolving speed, 90 ° of Angle Position time points and zero cross signal time point adjustment conduction pulses is presented, to realize
After the step of fan speed regulation, the method also includes:
Judge whether the electronic power switch device for receiving conduction pulses disconnects；
Whether when the electronic power switch device disconnects, detecting in the AC signal has interference signal；
If so, the end time point in the interference signal issues conduction pulses, so that electronic power switch break-over of device.
9. a kind of fan speed regulation control system, which is characterized in that the fan speed regulation control system includes:
Zero crossing obtains module, the rising time point of zero cross signal and failing edge time in the AC signal for detecting input
Point；
Control module, for calculating the AC signal time cycle according to the rising time point and the failing edge time point
90 ° of Angle Position time points and zero cross signal time point；
The control module is also used to obtain the feedback revolving speed of blower, and when according to the feedback revolving speed, 90 ° of Angle Positions
Between put and the zero cross signal time point adjustment conduction pulses opening time point, to realize fan speed regulation.
10. a kind of electrical equipment, which is characterized in that the electrical equipment includes blower and fan speed regulation control system, the wind
It is realized when machine speed-adjusting and control system executes such as the step of fan speed regulation control method described in any item of the claim 1 to 8, or
Fan speed regulation control system described in person is configured as fan speed regulation control system as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910669410.8A CN110410346B (en) | 2019-07-23 | 2019-07-23 | Fan speed regulation control method and system and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910669410.8A CN110410346B (en) | 2019-07-23 | 2019-07-23 | Fan speed regulation control method and system and electrical equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110410346A true CN110410346A (en) | 2019-11-05 |
| CN110410346B CN110410346B (en) | 2021-05-25 |
Family
ID=68362647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910669410.8A Active CN110410346B (en) | 2019-07-23 | 2019-07-23 | Fan speed regulation control method and system and electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110410346B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111245331A (en) * | 2020-01-06 | 2020-06-05 | 广东盈科电子有限公司 | AC motor constant rotating speed control method and device based on rotating speed feedback |
| CN114326455A (en) * | 2021-09-10 | 2022-04-12 | 金华好哥信息技术有限公司 | Method and system for eliminating induced electricity of intelligent clothes airing machine |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994017306A1 (en) * | 1993-01-26 | 1994-08-04 | Sundstrand Corporation | Fan with secondary air passage for motor cooling |
| CN103259426A (en) * | 2012-02-17 | 2013-08-21 | 快捷韩国半导体有限公司 | Switch controller, switch control method, and power supply device comprising switch controller |
| CN106374807A (en) * | 2016-09-29 | 2017-02-01 | 广东美的制冷设备有限公司 | AC motor control method and device and air conditioner |
| CN108087302A (en) * | 2017-12-08 | 2018-05-29 | 广东美的制冷设备有限公司 | Axial-flow windwheel and air conditioner |
| CN108196099A (en) * | 2017-12-20 | 2018-06-22 | 广州广电计量检测股份有限公司 | ON-OFF control circuit and test equipment |
| CN108696207A (en) * | 2018-05-29 | 2018-10-23 | 广东威灵电机制造有限公司 | The control method and control system of high-speed brushless DC electromotor |
| CN109391207A (en) * | 2017-08-04 | 2019-02-26 | 广东美的生活电器制造有限公司 | Food cooking machine and its constant speed control method and device |
-
2019
- 2019-07-23 CN CN201910669410.8A patent/CN110410346B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994017306A1 (en) * | 1993-01-26 | 1994-08-04 | Sundstrand Corporation | Fan with secondary air passage for motor cooling |
| CN103259426A (en) * | 2012-02-17 | 2013-08-21 | 快捷韩国半导体有限公司 | Switch controller, switch control method, and power supply device comprising switch controller |
| CN106374807A (en) * | 2016-09-29 | 2017-02-01 | 广东美的制冷设备有限公司 | AC motor control method and device and air conditioner |
| CN109391207A (en) * | 2017-08-04 | 2019-02-26 | 广东美的生活电器制造有限公司 | Food cooking machine and its constant speed control method and device |
| CN108087302A (en) * | 2017-12-08 | 2018-05-29 | 广东美的制冷设备有限公司 | Axial-flow windwheel and air conditioner |
| CN108196099A (en) * | 2017-12-20 | 2018-06-22 | 广州广电计量检测股份有限公司 | ON-OFF control circuit and test equipment |
| CN108696207A (en) * | 2018-05-29 | 2018-10-23 | 广东威灵电机制造有限公司 | The control method and control system of high-speed brushless DC electromotor |
Non-Patent Citations (1)
| Title |
|---|
| 张明峰: "《PIC单片机入门与实战》", 30 September 2004, 北京航空航天大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111245331A (en) * | 2020-01-06 | 2020-06-05 | 广东盈科电子有限公司 | AC motor constant rotating speed control method and device based on rotating speed feedback |
| CN114326455A (en) * | 2021-09-10 | 2022-04-12 | 金华好哥信息技术有限公司 | Method and system for eliminating induced electricity of intelligent clothes airing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110410346B (en) | 2021-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Mishra et al. | Solar photovoltaic array dependent dual output converter based water pumping using switched reluctance motor drive | |
| Khosravi et al. | Review of model predictive control strategies for matrix converters | |
| US8900042B2 (en) | Fan type temperature control method and device | |
| Ramasamy et al. | Direct‐drive low‐speed wind energy conversion system incorporating axial‐type permanent magnet generator and Z‐source inverter with sensorless maximum power point tracking controller | |
| CN110410346A (en) | Fan speed regulation control method, system and electrical equipment | |
| Deraz et al. | Current limiting soft starter for three phase induction motor drive system using PWM AC chopper | |
| Mishra et al. | Control of SRM drive for photovoltaic powered water pumping system | |
| CN110350584B (en) | Control method and control device of photovoltaic system, photovoltaic system and storage medium | |
| CN110087342B (en) | Pulse frequency modulation heating power regulation control method | |
| CN108809076A (en) | Totem pfc circuit, pulse width control method, air conditioner and storage medium | |
| CN103973134B (en) | Continuous-current plant and improve the pwm pulse control method of its power factor | |
| CN110332139A (en) | Fan speed regulation control method, system and electrical equipment | |
| Rathore et al. | Voltage‐controlled power factor corrected CSC derived DC–DC converter for PMBLDC driven home appliances | |
| CN110391804A (en) | Electronic cigarette automatic frequency adjustment method, apparatus, equipment and storage medium | |
| Wu et al. | Power conversion interface for small‐capacity wind power generation system | |
| CN110187734A (en) | Control method, device, electric appliance, air conditioner and the storage medium of electric appliance | |
| Dubey et al. | Solar power‐driven position sensorless control of permanent magnet brushless DC motor for refrigeration plant | |
| Yammen et al. | IoT based speed control of Smart Fan | |
| US10263544B2 (en) | System and method for using and controlling permanent magnet AC motor in place of triac-controlled PSC motor | |
| Liu et al. | Capacitor voltage synchronising control‐based VSG scheme for inertial and primary frequency responses of Type‐4 WTGs | |
| Samitha Ransara et al. | Buck converter based model for a brushless DC motor drive without a DC link capacitor | |
| CN102664572B (en) | Position sensorless control device of medium and high-voltage commutatorless motor | |
| Dhara et al. | RES and battery fed energy efficient single‐phase induction motor drive system with retrofit solution | |
| CN114696628A (en) | Power adjusting method and device for electric appliance, electric appliance and storage medium | |
| CN106788032A (en) | Alternating current generator rotary speed tracing control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |