CN110410346A - Fan speed regulation control method, system and electrical equipment - Google Patents
Fan speed regulation control method, system and electrical equipment Download PDFInfo
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- 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
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000000630 rising effect Effects 0.000 claims abstract description 77
- 230000008859 change Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
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- 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
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Electric Motors In General (AREA)
- Control Of Positive-Displacement Air Blowers (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 invention relates to the technical field of electromechanics, in particular to a fan speed regulation control method, a fan speed regulation control system and electrical equipment.
Background
The fan is one of the indispensable component parts of electrical equipment, for example air conditioner, because the rotational speed of fan has directly influenced the air output, and then has influenced the control by temperature change precision and the operating stability of electrical apparatus, consequently in order to ensure stable operation and the temperature control precision of electrical apparatus, fan rotational speed control must possess good anti-interference performance.
At present, the speed of a fan is generally regulated by detecting a zero-crossing signal time point through an optical coupler by an alternating current signal, and then regulating the conduction angle of a silicon controlled rectifier or a solid-state relay by a control module according to the zero-crossing signal time point detected by the optical coupler and the rotating speed fed back by the fan, thereby regulating the rotating speed of the fan. However, in practical applications, there are many interference factors in the speed regulation process of the fan, for example, due to the comprehensive influence of the optocoupler conduction voltage generated when the optocoupler is conducted and the ac signal voltage for reducing power consumption, the zero-crossing signal time point detected by the optocoupler is not necessarily the real zero-crossing signal time point, and the fan speed regulation is not accurate due to the interference factors.
Disclosure of Invention
The invention mainly aims to provide a fan speed regulation control method, a fan speed regulation control system and electrical equipment, and aims to solve the technical problem of inaccurate speed regulation caused by interference factors during fan speed regulation in the prior art.
In order to achieve the purpose, the invention provides a fan speed regulation control method, which comprises the following steps:
acquiring a rising edge time point and a falling edge time point of a zero-crossing signal in an input alternating current signal, and calculating a 90-degree angular position time point and a zero-crossing signal time point of an alternating current signal time period according to the rising edge time point and the falling edge time point;
and acquiring the feedback rotating speed of the fan, and adjusting the starting time point of the conduction pulse according to the feedback rotating speed, the 90-degree angular position time point and the zero-crossing signal time point so as to realize the speed regulation of the fan.
Preferably, the step of calculating the 90 ° angular position time point and the zero-crossing signal time point of the ac signal time period according to the rising edge time point and the falling edge time point includes:
obtaining a rising pulse width and a falling pulse width according to the rising edge time point and the falling edge time point;
calculating the frequency of an alternating current signal and the 90-degree angular position time point of the time period of the alternating current signal according to the rising pulse width and the falling pulse width;
and obtaining a zero-crossing signal time point according to the 90-degree angular position time point and the alternating current signal frequency.
Preferably, the step of calculating the 90 ° angular position time point of the ac signal time period according to the rising pulse width and the falling pulse width includes:
calculating the 90 DEG angular position time point of the positive half cycle of the alternating current signal according to the rising pulse width;
and calculating the 90 DEG angular position time point of the negative half cycle of the alternating current signal according to the falling pulse width.
Preferably, the step of obtaining the time point of the zero-crossing signal according to the time point of the 90 ° angular position and the frequency of the alternating current signal includes:
acquiring a zero-crossing signal time point when the positive half period enters according to the 90-degree angular position time point of the positive half period and the alternating current signal frequency;
and acquiring a zero-crossing signal time point when the alternating current signal enters the negative half period according to the 90-degree angular position time point of the negative half period and the alternating current signal frequency.
Preferably, the step of obtaining the feedback rotation speed of the fan and adjusting the on time point of the conduction pulse according to the feedback rotation speed, the time point of the 90 ° angular position, and the time point of the zero-crossing signal includes:
when the time point of the 90-degree angular position of the positive half period is detected, acquiring a first feedback rotating speed of the fan, and adjusting the starting time point of the conduction pulse according to the first feedback rotating speed, the time point of the 90-degree angular position of the positive half period and the time point of the zero-crossing signal;
and when the 90-degree angular position time point of the negative half period is detected, acquiring a second feedback rotating speed of the fan, and adjusting the starting time point of the conduction pulse according to the second feedback rotating speed, the 90-degree angular position time point of the negative half period and the zero-crossing signal time point.
Preferably, the step of adjusting the turn-on time point of the conduction pulse according to the first feedback rotation speed, the time point of the 90 ° angular position of the positive half cycle, and the time point of the zero-crossing signal includes:
when the first feedback rotating speed is lower than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the 90-degree angular position of the positive half period of the current alternating current signal time period and the time point of the zero-crossing signal entering the positive half period;
and when the first feedback rotating speed is greater than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the angular position of 90 degrees in the positive half period of the current alternating current signal time period and the time point of entering the zero-crossing signal in the negative half period.
Preferably, the step of adjusting the turn-on time point of the conduction pulse according to the second feedback rotation speed, the 90 ° angular position time point of the negative half cycle, and the zero-crossing signal time point includes:
when the second feedback rotating speed is lower than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the 90-degree angular position of the negative half period of the current alternating current signal time period and the time point of the zero-crossing signal entering the negative half period;
and when the second feedback rotating speed is greater than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the 90-degree angular position of the negative half period of the current alternating current signal time period and the time point of the zero-crossing signal entering the positive half period in the next alternating current signal time period.
Preferably, after the step of adjusting the on-time point of the conduction pulse according to the feedback rotation speed, the time point of the 90 ° angular position, and the time point of the zero-crossing signal to realize the speed regulation of the fan, the method further includes:
judging whether the power electronic switching device receiving the conduction pulse is disconnected;
detecting whether an interference signal exists in the alternating current signal when the power electronic switching device is turned off;
if so, sending out a conduction pulse at the end time point of the interference signal so as to conduct the power electronic switching device.
In addition, in order to achieve the above object, the present invention further provides a fan speed control system, including:
the zero crossing point acquisition module is used for detecting the rising edge time point and the falling edge time point of a zero crossing signal in an input alternating current signal;
the control module is used for calculating a 90-degree angular position time point and a zero-crossing signal time point of an alternating current signal time period according to the rising edge time point and the falling edge time point;
the control module is further used for obtaining the feedback rotating speed of the fan and adjusting the starting time point of the conduction pulse according to the feedback rotating speed, the 90-degree angular position time point and the zero-crossing signal time point so as to realize speed regulation of the fan.
Furthermore, to achieve the above object, the present invention further provides an electrical device, which includes a fan and a fan speed control system, and when the fan speed control system executes the steps of the fan speed control method according to any one of claims 1 to 8, or the fan speed control system is configured as the fan speed control system according to claim 9.
According to the method, the rising edge time point and the falling edge time point of a zero-crossing signal in an input alternating current signal are obtained, and the 90-degree angular position time point and the zero-crossing signal time point of an alternating current signal time period are calculated according to the rising edge time point and the falling edge time point; and then, the fan speed is regulated by acquiring the feedback rotating speed of the fan and adjusting the starting time point of the conduction pulse according to the feedback rotating speed, the 90-degree angular position time point and the zero-crossing signal time point. The real zero-crossing signal time point is calculated according to the characteristic that the 90-degree angular position of the alternating current signal time period does not change, and compared with the traditional zero-crossing point detection, the method has better reliability and is not easily interfered by clutter signals; and the influence of the up-and-down movement of the alternating voltage of the power grid on the speed regulation of the fan is reduced, and the speed regulation accuracy of the fan is improved.
Drawings
Fig. 1 is a schematic structural diagram of a fan speed regulation control system in an electrical apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a fan speed control method according to the present invention;
FIG. 3 is a diagram illustrating a correspondence relationship between an AC signal and a converted signal after optical coupling isolation according to a first embodiment of a fan speed control method of the present invention;
FIG. 4 is a schematic flow chart of a fan speed control method according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating an implementation of a conduction pulse when an interference signal appears in a rising pulse of an AC signal according to a second embodiment of the fan speed control method of the present invention;
FIG. 6 is a schematic diagram illustrating the implementation of the conduction pulse when the interference signal appears in the falling pulse of the AC signal according to the second embodiment of the fan speed control method of the present invention;
FIG. 7 is a functional block diagram of an embodiment of a fan speed control system according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an electrical device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the electric device may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the electrical apparatus, and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a fan speed control program.
In the electric appliance shown in fig. 1, the network interface 1004 is mainly used for data communication with an external network; the user interface 1003 is mainly used for receiving input instructions of a user; the electrical equipment calls a fan speed regulation control program stored in the memory 1005 through the processor 1001, and executes the following operations:
acquiring a rising edge time point and a falling edge time point of a zero-crossing signal in an input alternating current signal, and calculating a 90-degree angular position time point and a zero-crossing signal time point of the alternating current signal time period according to the rising edge time point and the falling edge time point;
and acquiring the feedback rotating speed of the fan, and adjusting the starting time point of the conduction pulse according to the feedback rotating speed, the 90-degree angular position time point and the zero-crossing signal time point so as to realize the speed regulation of the fan.
Further, the processor 1001 may call a fan speed control program stored in the memory 1005, and further perform the following operations:
obtaining a rising pulse width and a falling pulse width according to the rising edge time point and the falling edge time point;
calculating the frequency of an alternating current signal and the 90-degree angular position time point of the time period of the alternating current signal according to the rising pulse width and the falling pulse width;
and obtaining a zero-crossing signal time point according to the 90-degree angular position time point and the alternating current signal frequency.
Further, the processor 1001 may call a fan speed control program stored in the memory 1005, and further perform the following operations:
calculating the 90 DEG angular position time point of the positive half cycle of the alternating current signal according to the rising pulse width;
and calculating the 90 DEG angular position time point of the negative half cycle of the alternating current signal according to the falling pulse width.
Further, the processor 1001 may call a fan speed control program stored in the memory 1005, and further perform the following operations:
acquiring a zero-crossing signal time point when the positive half period enters according to the 90-degree angular position time point of the positive half period and the alternating current signal frequency;
and acquiring a zero-crossing signal time point when the alternating current signal enters the negative half period according to the 90-degree angular position time point of the negative half period and the alternating current signal frequency.
Further, the processor 1001 may call a fan speed control program stored in the memory 1005, and further perform the following operations:
when the time point of the 90-degree angular position of the positive half period is detected, acquiring a first feedback rotating speed of the fan, and adjusting the starting time point of the conduction pulse according to the first feedback rotating speed, the time point of the 90-degree angular position of the positive half period and the time point of the zero-crossing signal;
and when the 90-degree angular position time point of the negative half period is detected, acquiring a second feedback rotating speed of the fan, and adjusting the starting time point of the conduction pulse according to the second feedback rotating speed, the 90-degree angular position time point of the negative half period and the zero-crossing signal time point.
Further, the processor 1001 may call a fan speed control program stored in the memory 1005, and further perform the following operations:
when the first feedback rotating speed is lower than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the 90-degree angular position of the positive half period of the current alternating current signal time period and the time point of the zero-crossing signal entering the positive half period;
and when the first feedback rotating speed is greater than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the angular position of 90 degrees in the positive half period of the current alternating current signal time period and the time point of entering the zero-crossing signal in the negative half period.
Further, the processor 1001 may call a fan speed control program stored in the memory 1005, and further perform the following operations:
when the second feedback rotating speed is lower than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the 90-degree angular position of the negative half period of the current alternating current signal time period and the time point of the zero-crossing signal entering the negative half period;
and when the second feedback rotating speed is greater than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the 90-degree angular position of the negative half period of the current alternating current signal time period and the time point of the zero-crossing signal entering the positive half period in the next alternating current signal time period.
Further, the processor 1001 may call a fan speed control program stored in the memory 1005, and further perform the following operations:
judging whether the power electronic switching device receiving the conduction pulse is disconnected;
detecting whether an interference signal exists in the alternating current signal when the power electronic switching device is turned off;
if so, sending out a conduction pulse at the end time point of the interference signal so as to conduct the power electronic switching device.
According to the scheme, the rising edge time point and the falling edge time point of the zero-crossing signal in the input alternating current signal are obtained, and the 90-degree angular position time point and the zero-crossing signal time point of the alternating current signal time period are calculated according to the rising edge time point and the falling edge time point; and then, the fan speed is regulated by acquiring the feedback rotating speed of the fan and adjusting the starting time point of the conduction pulse according to the feedback rotating speed, the 90-degree angular position time point and the zero-crossing signal time point. The real zero-crossing signal time point is calculated according to the characteristic that the 90-degree angular position of the alternating current signal time period does not change, and compared with the traditional zero-crossing point detection, the method has better reliability and is not easily interfered by clutter signals; and the influence of the up-and-down movement of the alternating voltage of the power grid on the speed regulation of the fan is reduced, and the speed regulation accuracy of the fan is improved.
Based on the hardware structure, the invention provides various embodiments of the fan speed regulation control method.
Referring to fig. 2, fig. 2 is a schematic flow chart of a fan speed control method according to a first embodiment of the present invention.
In a first embodiment, the fan speed regulation control method includes the following steps:
s10: acquiring a rising edge time point and a falling edge time point of a zero-crossing signal in an input alternating current signal, and calculating a 90-degree angular position time point and a zero-crossing signal time point of the alternating current signal time period according to the rising edge time point and the falling edge time point;
it should be noted that the ac signal may be understood as an ac voltage signal in the power grid, and the zero-crossing signal may be understood as a signal at a time when the amplitude of the ac signal is zero (positive-negative conversion). In the embodiment, the real time point of the zero-crossing signal is calculated by detecting the rising edge time point and the falling edge time point of the zero-crossing signal in the alternating current signal.
Specifically, the process of obtaining the time point of the zero-crossing signal may be to obtain a rising edge time point and a falling edge time point of the zero-crossing signal in the input ac signal, and obtain a rising pulse width and a falling pulse width according to the rising edge time point and the falling edge time point; calculating the frequency of an alternating current signal and the 90-degree angular position time point of the time period of the alternating current signal according to the rising pulse width and the falling pulse width; and obtaining a zero-crossing signal time point according to the 90-degree angular position time point and the alternating current signal frequency.
Referring to fig. 3, in this embodiment, the detailed steps of obtaining the time point of the zero-crossing signal are as follows:
step 1, detecting the rising edge of a zero-crossing signal, and recording the current time t0 (rising edge time point);
step 2, detecting the falling edge of the zero-crossing signal, and recording the current time t1 (the time point of the falling edge);
step 3, calculating a rising pulse width (namely high level period time) according to t0 and t1, and when the rising pulse width is larger than a preset minimum high level pulse width A, setting the rising pulse width as Th;
step 4, detecting the rising edge of the next zero-crossing signal, and recording the current time t2 (the time point of the next rising edge);
step 5, calculating a falling pulse width (namely, low-level period time) according to t2 and t1, setting the falling pulse width to be Tl when the falling pulse width is greater than a preset minimum low-level pulse width B, and calculating an alternating current signal period time Tx to be Th + Tl;
step 6, calculating a 90 ° angular position time point Th90 of the positive half cycle of the alternating current signal according to the rising pulse width Th, wherein Th90 is 1/2 Th;
step 7, calculating a 90 ° angular position time point Tl90 of the negative half cycle of the alternating current signal according to the falling pulse width Tl, wherein Tl90 is 1/2 Tl;
step 8, calculating the frequency 1/Tx of the alternating current signal according to the rising pulse width Th and the falling pulse width Tl;
step 9, obtaining a zero-crossing signal time point Th0 when entering the positive half cycle according to the 90 ° angular position time point Th90 of the positive half cycle and the alternating signal frequency 1/Tx, wherein Th0 is Th90-1/4 Tx;
and step 10, obtaining a zero-crossing signal time point TL0 when the negative half cycle enters according to the 90-degree angular position time point Tl90 of the negative half cycle and the alternating current signal frequency 1/Tx, wherein TL0 is Tl90-1/4 Tx.
In the embodiment, the rising edge time point and the falling edge time point are detected in real time, and the real zero-crossing signal time point is calculated through the rising pulse width and the falling pulse width, so that the alternating current signal frequency of the power grids of different countries can be compatible; compared with zero crossing point detection in the prior art, the detection period of the embodiment is longer, the detection reliability is better, the noise signal interference is not easy to receive, and even if the alternating voltage of the power grid moves up and down, the phase of the 90-degree angular position of the alternating signal cannot be changed, and the influence on the speed regulation of the fan cannot be caused.
S20: and acquiring the feedback rotating speed of the fan, and adjusting the starting time point of the conduction pulse according to the feedback rotating speed, the 90-degree angular position time point and the zero-crossing signal time point so as to realize the speed regulation of the fan.
It should be noted that the power electronic switching device may be a thyristor or a solid-state relay, and the present embodiment does not limit this. Accordingly, the on pulse refers to an on pulse corresponding to an on pulse for turning on the thyristor or the solid-state relay.
It should be understood that, in the process of fan speed regulation, the on time point of the conduction pulse determines the conduction angle of the power electronic switching device, and the fan adjusts the rotation speed according to the conduction angle and the conduction pulse width.
Specifically, when the 90 ° angular position time point Th90 of the positive half cycle is detected, a first feedback rotation speed of the fan is obtained, and the on time point of the conduction pulse is adjusted according to the first feedback rotation speed, the 90 ° angular position time point Th90 of the positive half cycle, and the zero-crossing signal time point.
When the feedback rotating speed is lower than the target rotating speed, the starting time point of the conduction pulse is adjusted to be between the time point Th90 of the 90-degree angular position of the positive half cycle of the current alternating current signal time period and the time point TH0 of the zero-crossing signal entering the positive half cycle, namely the starting point of the power electronic switching device is controlled and adjusted to move forwards, so that the conduction angle of the power electronic switching device is increased, and the current fan rotating speed is increased.
When the feedback rotating speed is greater than the target rotating speed, the starting time point of the conduction pulse is adjusted to be between the time point Th90 of the angular position of 90 degrees of the positive half cycle of the current alternating current signal time period and the time point TL0 of the zero-crossing signal entering the negative half cycle, namely the starting point of the power electronic switching device is controlled and adjusted to move backwards, so that the conduction angle of the power electronic switching device is reduced, and the current fan rotating speed is reduced.
Specifically, when the 90 ° angular position time point Tl90 of the negative half cycle is detected, a second feedback rotation speed of the fan is obtained, and the on time point of the conduction pulse is adjusted according to the second feedback rotation speed, the 90 ° angular position time point Tl90 of the negative half cycle, and the zero-crossing signal time point.
When the feedback rotating speed is lower than the target rotating speed, the starting time point of the conduction pulse is adjusted to be between the 90-degree angular position time point Tl90 of the negative half period of the current alternating current signal time period and the zero-crossing signal time point TL0 of the negative half period, namely the starting point of the power electronic switching device is controlled and adjusted to move forwards, so that the conduction angle of the power electronic switching device is increased, and the current fan rotating speed is increased.
When the feedback rotating speed is greater than the target rotating speed, the starting time point of the conduction pulse is adjusted to be between the 90-degree angular position time point Tl90 of the negative half period of the current alternating current signal time period and the zero-crossing signal time point TH 0' of the positive half period entering the next alternating current signal time period, namely the starting point of the power electronic switching device is controlled and adjusted to move backwards, so that the conduction angle of the power electronic switching device is reduced, and the current fan rotating speed is reduced.
In the embodiment, the rising edge time point and the falling edge time point of the zero-crossing signal in the input alternating current signal are obtained, and the 90-degree angular position time point and the zero-crossing signal time point of the alternating current signal time period are calculated according to the rising edge time point and the falling edge time point; and then, the fan speed is regulated by acquiring the feedback rotating speed of the fan and adjusting the starting time point of the conduction pulse according to the feedback rotating speed, the 90-degree angular position time point and the zero-crossing signal time point. The real zero-crossing signal time point is calculated according to the characteristic that the 90-degree angular position of the alternating current signal time period does not change, and compared with the traditional zero-crossing point detection, the method has better reliability and is not easily interfered by clutter signals; and the influence of the up-and-down movement of the alternating voltage of the power grid on the speed regulation of the fan is reduced, and the speed regulation accuracy of the fan is improved.
Further, as shown in fig. 4, a second embodiment of the fan speed control method according to the present invention is proposed based on the first embodiment, and in this embodiment, after step S20, the method further includes the following steps:
s30: judging whether the power electronic switching device receiving the conduction pulse is disconnected;
it should be understood that, due to different application scenarios of electrical equipment, under a severe environment, the electrical equipment is affected by interference signals or voltage drops in a power grid, so that a power electronic switching device is abnormally turned off, effective conduction time of the device is reduced, and a fan stalls. Therefore, after the power electronic switching device is turned on, it is also necessary to determine whether it is turned off.
S40: detecting whether an interference signal exists in the alternating current signal when the power electronic switching device is turned off;
it can be understood that, because the pulse width of the interference signal is generally small, whether the interference signal exists in the alternating current signal can be determined by detecting whether the pulse width of the interference signal is smaller than a preset value N, and when the pulse width of a certain signal in the alternating current signal is smaller than N, the interference signal exists in the alternating current signal. Of course, the determination method of the interference signal may also adopt other methods, which is not limited in this embodiment.
S50: and if so, sending the conduction pulse at the end time point of the interference signal so as to conduct the power electronic switching device.
Referring to fig. 5 and fig. 6 together, fig. 5 is a schematic diagram illustrating the application of the conducting pulse when the interference signal appears in the rising pulse of the ac signal, and when the interference signal appears in the rising pulse of the ac signal is detected, the conducting pulse is not generated, and the power electronic switching device is turned off, so that the conducting pulse of the power electronic switching device needs to be turned on again at the end of the interference pulse to turn on the power electronic switching device again. Fig. 6 is a schematic diagram of the application of the conduction pulse when the interference signal appears in the falling pulse of the ac signal, and when the interference signal appears in the falling pulse of the ac signal is detected, the conduction pulse is not generated, and the power electronic switching device is turned off, so that the conduction pulse of the power electronic switching device needs to be turned on again when the interference pulse is ended, so as to turn on the power electronic switching device again.
The embodiment determines whether the power electronic switching device receiving the turn-on pulse is turned off; detecting whether an interference signal exists in the alternating current signal when the power electronic switching device is turned off; if yes, the conduction pulse is sent out at the end time point of the interference signal so as to conduct the power electronic switching device, the power electronic switching device is effectively prevented from being turned off when the interference signal or voltage drops, the fan is prevented from stalling, and the anti-interference performance of the fan regulation is improved.
The invention further provides a fan speed regulation control system.
Referring to fig. 7, fig. 7 is a functional block diagram of an embodiment of a fan speed control system according to the present invention.
In this embodiment, the fan speed control system includes:
a zero-crossing point obtaining module 10, configured to detect a rising edge time point and a falling edge time point of a zero-crossing signal in an input ac signal;
the control module 20 is configured to calculate a 90 ° angular position time point and a zero-crossing signal time point of an ac signal time period according to the rising edge time point and the falling edge time point;
the control module 20 is further configured to obtain a feedback rotation speed of the fan, and adjust a start time point of the conduction pulse according to the feedback rotation speed, the 90 ° angular position time point, and the zero-crossing signal time point, so as to adjust the speed of the fan.
It should be noted that the ac signal may be understood as an ac voltage signal in the power grid, and the zero-crossing signal may be understood as a signal at a time when the amplitude of the ac signal is zero (positive-negative conversion). In the embodiment, the real time point of the zero-crossing signal is calculated by detecting the rising edge time point and the falling edge time point of the zero-crossing signal in the alternating current signal.
The zero crossing point obtaining module 10 may include a unidirectional optocoupler, and when the ac signal is in the positive half period and reaches a unidirectional optocoupler starting voltage, the unidirectional optocoupler is turned on, transmits a rising edge level of the starting signal to the control module 20, and transmits a high level to the control module 20 after the unidirectional optocoupler is turned on;
when the alternating current signal is in the negative half period or the starting voltage of the unidirectional optocoupler is not reached, the unidirectional optocoupler is turned off, the falling edge level of the turn-off signal is transmitted to the control module 20, and the low level is transmitted to the control module 20 after the unidirectional optocoupler is turned off.
Or, when the ac signal is in the positive half period and reaches the unidirectional optocoupler start voltage, when the unidirectional optocoupler is started, the start signal transmits the falling edge to the control module 20 after being isolated in the reverse direction, and transmits the low level of the start signal after being isolated in the reverse direction to the control module 20 after the unidirectional optocoupler is started.
When the alternating voltage signal is in the negative half period or the starting voltage of the unidirectional optocoupler is not reached, the unidirectional optocoupler is closed, the closing signal transmits the rising edge to the control module 20 after being reversely isolated, and the closing signal transmits the high level after being reversely isolated to the control module 20 after the unidirectional optocoupler is closed.
Further, the fan speed control system includes: an alternating voltage input module 30, a driving module 40 and a feedback module 60; wherein,
the alternating voltage input module 30 is connected to the zero crossing point obtaining module 10, and is configured to receive an alternating voltage, generate an alternating signal, and send the alternating signal to the zero crossing point obtaining module 10;
the driving module 40 comprises a power electronic switching device, and the driving module 40 is connected to the control module 20 and the fan module 50 respectively, and is configured to receive a turn-on time point sent by the control module 20, adjust a conduction angle of the power electronic switching device according to the turn-on time point, and send a driving signal to the fan module 50, so that the fan module 50 receives the driving signal, and adjust a rotation speed of the fan according to the driving signal;
the feedback module 60 is connected to the control module 20 and the fan module 50, and configured to receive a rotation speed detection signal fed back by the fan module 50, and send the rotation speed detection signal to the control module 20, so that the control module 20 adjusts the starting time point according to the rotation speed detection signal.
Based on the hardware structure, the process of obtaining the time point of the zero-crossing signal by the control module 20 may be to obtain a rising edge time point and a falling edge time point of the zero-crossing signal in the input ac signal, and obtain a rising pulse width (i.e., a high level cycle time) and a falling pulse width (i.e., a low level cycle time) according to the rising edge time point and the falling edge time point; calculating the frequency of an alternating current signal and the 90-degree angular position time point of the time period of the alternating current signal according to the rising pulse width and the falling pulse width; and obtaining a zero-crossing signal time point according to the 90-degree angular position time point and the alternating current signal frequency.
The detailed steps for acquiring the time point of the zero-crossing signal are as follows:
step 1, detecting the rising edge of a zero-crossing signal, and recording the current time t0 (rising edge time point);
step 2, detecting the falling edge of the zero-crossing signal, and recording the current time t1 (the time point of the falling edge);
step 3, calculating a rising pulse width according to t0 and t1, and setting the rising pulse width as Th when the rising pulse width is larger than a preset minimum high level pulse width A;
step 4, detecting the rising edge of the next zero-crossing signal, and recording the current time t2 (the time point of the next rising edge);
step 5, calculating a falling pulse width according to t2 and t1, setting the falling pulse width to Tl when the falling pulse width is greater than a preset minimum low level pulse width B, and calculating the period time Tx of the alternating current signal to be Th + Tl;
step 6, calculating a 90 ° angular position time point Th90 of the positive half cycle of the alternating current signal according to the rising pulse width Th, wherein Th90 is 1/2 Th;
step 7, calculating a 90 ° angular position time point Tl90 of the negative half cycle of the alternating current signal according to the falling pulse width Tl, wherein Tl90 is 1/2 Tl;
step 8, calculating the frequency 1/Tx of the alternating current signal according to the rising pulse width Th and the falling pulse width Tl;
step 9, obtaining a zero-crossing signal time point Th0 when entering the positive half cycle according to the 90 ° angular position time point Th90 of the positive half cycle and the alternating signal frequency 1/Tx, wherein Th0 is Th90-1/4 Tx;
and step 10, obtaining a zero-crossing signal time point TL0 when the negative half cycle enters according to the 90-degree angular position time point Tl90 of the negative half cycle and the alternating current signal frequency 1/Tx, wherein TL0 is Tl90-1/4 Tx.
In the embodiment, the rising edge time point and the falling edge time point are detected in real time, and the real zero-crossing signal time point is calculated through the rising pulse width and the falling pulse width, so that the alternating current signal frequency of the power grids of different countries can be compatible; compared with zero crossing point detection in the prior art, the detection period of the embodiment is longer, the detection reliability is better, the noise signal interference is not easy to receive, and even if the alternating voltage of the power grid moves up and down, the phase of the 90-degree angular position of the alternating signal cannot be changed, and the influence on the speed regulation of the fan cannot be caused.
It should be noted that the power electronic switching device may be a thyristor or a solid-state relay, and the present embodiment does not limit this. Accordingly, the on pulse refers to an on pulse corresponding to an on pulse for turning on the thyristor or the solid-state relay.
It should be understood that, in the process of fan speed regulation, the on time point of the conduction pulse determines the conduction angle of the power electronic switching device, and the fan adjusts the rotation speed according to the conduction angle and the conduction pulse width.
Specifically, when the 90 ° angular position time point Th90 of the positive half cycle is detected, a first feedback rotation speed of the fan is obtained, and the on time point of the conduction pulse is adjusted according to the first feedback rotation speed, the 90 ° angular position time point Th90 of the positive half cycle, and the zero-crossing signal time point.
When the feedback rotating speed is lower than the target rotating speed, the starting time point of the conduction pulse is adjusted to be between the time point Th90 of the 90-degree angular position of the positive half cycle of the current alternating current signal time period and the time point TH0 of the zero-crossing signal entering the positive half cycle, namely the starting point of the power electronic switching device is controlled and adjusted to move forwards, so that the conduction angle of the power electronic switching device is increased, and the current fan rotating speed is increased.
When the feedback rotating speed is greater than the target rotating speed, the starting time point of the conduction pulse is adjusted to be between the time point Th90 of the angular position of 90 degrees of the positive half cycle of the current alternating current signal time period and the time point TL0 of the zero-crossing signal entering the negative half cycle, namely the starting point of the power electronic switching device is controlled and adjusted to move backwards, so that the conduction angle of the power electronic switching device is reduced, and the current fan rotating speed is reduced.
Specifically, when the 90 ° angular position time point Tl90 of the negative half cycle is detected, a second feedback rotation speed of the fan is obtained, and the on time point of the conduction pulse is adjusted according to the second feedback rotation speed, the 90 ° angular position time point Tl90 of the negative half cycle, and the zero-crossing signal time point.
When the feedback rotating speed is lower than the target rotating speed, the starting time point of the conduction pulse is adjusted to be between the 90-degree angular position time point Tl90 of the negative half period of the current alternating current signal time period and the zero-crossing signal time point TL0 of the negative half period, namely the starting point of the power electronic switching device is controlled and adjusted to move forwards, so that the conduction angle of the power electronic switching device is increased, and the current fan rotating speed is increased.
When the feedback rotating speed is greater than the target rotating speed, the starting time point of the conduction pulse is adjusted to be between the 90-degree angular position time point Tl90 of the negative half period of the current alternating current signal time period and the zero-crossing signal time point TH 0' of the positive half period entering the next alternating current signal time period, namely the starting point of the power electronic switching device is controlled and adjusted to move backwards, so that the conduction angle of the power electronic switching device is reduced, and the current fan rotating speed is reduced.
In the embodiment, the rising edge time point and the falling edge time point of the zero-crossing signal in the input alternating current signal are obtained, and the 90-degree angular position time point and the zero-crossing signal time point of the alternating current signal time period are calculated according to the rising edge time point and the falling edge time point; and then, the fan speed is regulated by acquiring the feedback rotating speed of the fan and adjusting the starting time point of the conduction pulse according to the feedback rotating speed, the 90-degree angular position time point and the zero-crossing signal time point. The real zero-crossing signal time point is calculated according to the characteristic that the 90-degree angular position of the alternating current signal time period does not change, and compared with the traditional zero-crossing point detection, the method has better reliability and is not easily interfered by clutter signals; and the influence of the up-and-down movement of the alternating voltage of the power grid on the speed regulation of the fan is reduced, and the speed regulation accuracy of the fan is improved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A fan speed regulation control method is characterized by comprising the following steps:
acquiring a rising edge time point and a falling edge time point of a zero-crossing signal in an input alternating current signal, and calculating a 90-degree angular position time point and a zero-crossing signal time point of an alternating current signal time period according to the rising edge time point and the falling edge time point;
and acquiring the feedback rotating speed of the fan, and adjusting the starting time point of the conduction pulse according to the feedback rotating speed, the 90-degree angular position time point and the zero-crossing signal time point so as to realize the speed regulation of the fan.
2. The fan speed control method according to claim 1, wherein the step of calculating the 90 ° angular position time point and the zero-crossing signal time point of the ac signal time period according to the rising edge time point and the falling edge time point comprises:
obtaining a rising pulse width and a falling pulse width according to the rising edge time point and the falling edge time point;
calculating the frequency of an alternating current signal and the 90-degree angular position time point of the time period of the alternating current signal according to the rising pulse width and the falling pulse width;
and obtaining a zero-crossing signal time point according to the 90-degree angular position time point and the alternating current signal frequency.
3. The fan speed control method according to claim 2, wherein the step of calculating the 90 ° angular position time point of the ac signal time period according to the rising pulse width and the falling pulse width comprises:
calculating the 90 DEG angular position time point of the positive half cycle of the alternating current signal according to the rising pulse width;
and calculating the 90 DEG angular position time point of the negative half cycle of the alternating current signal according to the falling pulse width.
4. The fan speed control method according to claim 3, wherein the step of obtaining the zero-crossing signal time point according to the 90 ° angular position time point and the ac signal frequency comprises:
acquiring a zero-crossing signal time point when the positive half period enters according to the 90-degree angular position time point of the positive half period and the alternating current signal frequency;
and acquiring a zero-crossing signal time point when the alternating current signal enters the negative half period according to the 90-degree angular position time point of the negative half period and the alternating current signal frequency.
5. The fan speed control method according to claim 4, wherein the step of obtaining the feedback rotation speed of the fan and adjusting the on time point of the conduction pulse according to the feedback rotation speed, the 90 ° angular position time point and the zero-crossing signal time point comprises:
when the time point of the 90-degree angular position of the positive half period is detected, acquiring a first feedback rotating speed of the fan, and adjusting the starting time point of the conduction pulse according to the first feedback rotating speed, the time point of the 90-degree angular position of the positive half period and the time point of the zero-crossing signal;
and when the 90-degree angular position time point of the negative half period is detected, acquiring a second feedback rotating speed of the fan, and adjusting the starting time point of the conduction pulse according to the second feedback rotating speed, the 90-degree angular position time point of the negative half period and the zero-crossing signal time point.
6. The fan speed control method of claim 5, wherein the step of adjusting the turn-on time point of the conduction pulse according to the first feedback rotation speed, the 90 ° angular position time point of the positive half-cycle, and the zero-crossing signal time point comprises:
when the first feedback rotating speed is lower than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the 90-degree angular position of the positive half period of the current alternating current signal time period and the time point of the zero-crossing signal entering the positive half period;
and when the first feedback rotating speed is greater than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the angular position of 90 degrees in the positive half period of the current alternating current signal time period and the time point of entering the zero-crossing signal in the negative half period.
7. The fan speed control method of claim 5, wherein the step of adjusting the turn-on time point of the conduction pulse according to the second feedback rotation speed, the 90 ° angular position time point of the negative half-cycle, and the zero-crossing signal time point comprises:
when the second feedback rotating speed is lower than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the 90-degree angular position of the negative half period of the current alternating current signal time period and the time point of the zero-crossing signal entering the negative half period;
and when the second feedback rotating speed is greater than the target rotating speed, adjusting the starting time point of the conduction pulse to be between the time point of the 90-degree angular position of the negative half period of the current alternating current signal time period and the time point of the zero-crossing signal entering the positive half period in the next alternating current signal time period.
8. The fan speed control method according to any one of claims 1 to 7, wherein after the step of adjusting the on-time point of the conduction pulse according to the feedback rotation speed, the 90 ° angular position time point and the zero-crossing signal time point to realize fan speed regulation, the method further comprises:
judging whether the power electronic switching device receiving the conduction pulse is disconnected;
detecting whether an interference signal exists in the alternating current signal when the power electronic switching device is turned off;
if so, sending out a conduction pulse at the end time point of the interference signal so as to conduct the power electronic switching device.
9. The utility model provides a fan speed control system which characterized in that, fan speed control system includes:
the zero crossing point acquisition module is used for detecting the rising edge time point and the falling edge time point of a zero crossing signal in an input alternating current signal;
the control module is used for calculating a 90-degree angular position time point and a zero-crossing signal time point of an alternating current signal time period according to the rising edge time point and the falling edge time point;
the control module is further used for obtaining the feedback rotating speed of the fan and adjusting the starting time point of the conduction pulse according to the feedback rotating speed, the 90-degree angular position time point and the zero-crossing signal time point so as to realize speed regulation of the fan.
10. Electrical apparatus, characterized in that the electrical apparatus comprises a fan and a fan speed control system, which when executed performs the steps of the fan speed control method of any of claims 1 to 8, or which is configured as the fan speed control system of claim 9.
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