CN110332139A - 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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- CN110332139A CN110332139A CN201910669409.5A CN201910669409A CN110332139A CN 110332139 A CN110332139 A CN 110332139A CN 201910669409 A CN201910669409 A CN 201910669409A CN 110332139 A CN110332139 A CN 110332139A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000000630 rising effect Effects 0.000 claims abstract description 74
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 29
- 229910052710 silicon Inorganic materials 0.000 abstract description 29
- 239000010703 silicon Substances 0.000 abstract description 29
- 230000001276 controlling effect Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
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- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 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
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (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 zero cross signal time point is calculated according to rising time point and failing edge time point；The feedback revolving speed of preset time point and blower is obtained, and according to the opening time point and conducting pulsewidth of feedback revolving speed, preset time point and zero cross signal time point adjustment conduction pulses, to realize fan speed regulation.Real zero cross signal time point is wherein calculated according to the characteristics of AC signal time cycle, it is adjusted with the opening time point to conduction pulses, and the size of the conducting pulsewidth of the switching device including dynamic regulation is for example silicon-controlled or solid-state relay, it solves electric current and voltage when alternating voltage is too low or rotation speed of fan is excessively high and phase difference occurs, conduction pulses are adjusted to improper pass range, the problem of fan stall report failure, improve 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 adjusting the opening time point of a conduction pulse 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 so as to fix the conduction pulse width, adjust the conduction angle of a silicon controlled rectifier or a solid-state relay and drive the fan to rotate. However, in practical applications, when the rotating speed of the fan becomes high, the alternating voltage of the power grid becomes low, or the frequency of the alternating current signal becomes low, a phase difference occurs between a current signal and a voltage signal for driving the fan, so that the conduction pulse of the thyristor or the solid-state relay is adjusted to an abnormal conduction range, thereby causing the stalling phenomenon of the fan and causing the inaccurate speed regulation of the fan.
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 the fact that a conduction pulse is regulated to an abnormal conduction range 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 the zero-crossing signal time point according to the rising edge time point and the falling edge time point;
and acquiring a preset time point and the feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the feedback rotating speed, the preset 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 time point of the zero-crossing signal according to the time point of the rising edge and the time point of the falling edge 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 a preset time point and a feedback rotation speed of the fan, and adjusting a turn-on time point and a turn-on pulse width of the turn-on pulse according to the feedback rotation speed, the preset time point and the zero-crossing signal time point includes:
when the alternating current signal is in a positive half period, acquiring a first preset time point and a first feedback rotating speed of a fan, and adjusting the starting time point and the conducting pulse width of a conducting pulse according to the first feedback rotating speed, the first preset time point and the zero-crossing signal time point;
and when the alternating current signal is in a negative half period, acquiring a second preset time point and a second feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the second feedback rotating speed, the second preset time point and the zero-crossing signal time point.
Preferably, the step of adjusting the on-time point and the on-pulse width of the on-pulse according to the first feedback rotation speed, the first preset time point, and the zero-crossing signal time point includes:
calculating the starting time point of the conduction pulse according to the first feedback rotating speed;
when the starting time point is between the first preset time point and the zero-crossing signal time point when the negative half period is entered, adjusting the conduction pulse width to be a fixed conduction pulse width so as to adjust the starting time point to move by the fixed conduction pulse width;
and when the starting time point is between the zero-crossing signal time point when the starting time point enters the positive half period and the first preset time point, adjusting the conduction pulse width to be a dynamic conduction pulse width so as to adjust the starting time point to move by the dynamic conduction pulse width.
Preferably, the step of adjusting the on-time point to move with a fixed on-pulse width includes:
when the first feedback rotating speed is lower than the target rotating speed, controlling the starting time point to move to the first preset time point by using a fixed conduction pulse width;
and when the first feedback rotating speed is greater than the target rotating speed, controlling the starting time point to move to the zero-crossing signal time point when the negative half period is entered by using a fixed conduction pulse width.
Preferably, the step of adjusting the on-time point shift with the dynamic on pulse width includes:
when the first feedback rotating speed is lower than the target rotating speed, increasing the conducting pulse width and controlling the starting time point to move to the zero-crossing signal time point when the positive half period is entered;
and when the first feedback rotating speed is greater than the target rotating speed, reducing the conduction pulse width and controlling the starting time point to move to the first preset time point.
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 zero-crossing signal time point according to the rising edge time point and the falling edge time point;
the control module is further used for acquiring a preset time point and a feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the feedback rotating speed, the preset 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.
The method comprises the steps of obtaining a rising edge time point and a falling edge time point of a zero-crossing signal in an input alternating current signal, and calculating the zero-crossing signal time point according to the rising edge time point and the falling edge time point; and acquiring a preset time point and the feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the feedback rotating speed, the preset time point and the zero-crossing signal time point so as to realize the speed regulation of the fan. The real zero-crossing signal time point is calculated according to the characteristics of the alternating current signal time period so as to adjust the starting time point of the conduction pulse, and the conduction pulse width of a switching device such as a silicon controlled rectifier or a solid-state relay is dynamically adjusted, so that the problems that when the alternating current voltage is too low or the rotating speed of the fan is too high, the phase difference occurs between the current and the voltage, the conduction pulse is adjusted to be in an abnormal conduction range, and the fan stalls and reports faults are solved, 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 detailed flowchart of step S20 when the AC signal is in the positive half-cycle according to the first embodiment of the method for controlling speed of a blower of the present invention;
FIG. 5 is a schematic diagram illustrating the implementation of the conduction pulse width adjustment when the AC signal is in the positive half period according to the first embodiment of the fan speed control method of the present invention;
FIG. 6 is a schematic diagram illustrating the implementation of the conduction pulse width adjustment when the AC signal is in the negative half-cycle 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 a fan speed regulation control system in an electrical appliance device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the electrical equipment includes a fan and a fan speed control system, and the fan speed control system 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 a fan speed control system, and may include more or fewer components than shown, or some components in combination, 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 fan speed control system 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 fan speed control system calls a fan speed control program stored in a memory 1005 through a 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 the zero-crossing signal time point according to the rising edge time point and the falling edge time point;
and acquiring a preset time point and the feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the feedback rotating speed, the preset 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 alternating current signal is in a positive half period, acquiring a first preset time point and a first feedback rotating speed of a fan, and adjusting the starting time point and the conducting pulse width of a conducting pulse according to the first feedback rotating speed, the first preset time point and the zero-crossing signal time point;
and when the alternating current signal is in a negative half period, acquiring a second preset time point and a second feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the second feedback rotating speed, the second preset time point 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:
calculating the starting time point of the conduction pulse according to the first feedback rotating speed;
when the starting time point is between the first preset time point and the zero-crossing signal time point when the negative half period is entered, adjusting the conduction pulse width to be a fixed conduction pulse width so as to adjust the starting time point by the fixed conduction pulse width;
and when the starting time point is between the zero-crossing signal time point when the starting time point enters the positive half period and the first preset time point, adjusting the conduction pulse width to be a dynamic conduction pulse width so as to adjust the starting time point by the dynamic conduction pulse width.
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, controlling the starting time point to move to the first preset time point by using a fixed conduction pulse width;
and when the first feedback rotating speed is greater than the target rotating speed, controlling the starting time point to move to the zero-crossing signal time point when the negative half period is entered by using a fixed conduction pulse width.
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, increasing the conducting pulse width and controlling the starting time point to move to the zero-crossing signal time point when the positive half period is entered;
and when the first feedback rotating speed is greater than the target rotating speed, reducing the conduction pulse width and controlling the starting time point to move to the first preset time point.
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 zero-crossing signal time point is calculated according to the rising edge time point and the falling edge time point; and acquiring a preset time point and the feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the feedback rotating speed, the preset time point and the zero-crossing signal time point so as to realize the speed regulation of the fan. The real zero-crossing signal time point is calculated according to the characteristics of the alternating current signal time period so as to adjust the starting time point of the conduction pulse, and the conduction pulse width of a switching device such as a silicon controlled rectifier or a solid-state relay is dynamically adjusted, so that the problems that when the alternating current voltage is too low or the rotating speed of the fan is too high, the phase difference occurs between the current and the voltage, the conduction pulse is adjusted to be in an abnormal conduction range, and the fan stalls and reports faults are solved, 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 the zero-crossing signal time point 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 a rising edge of a zero-crossing signal, and recording the current time t0 (namely a rising edge time point);
step 2, detecting a falling edge of the zero-crossing signal, and recording the current time t1 (namely a falling edge time point);
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 (namely 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 a preset time point and the feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the feedback rotating speed, the preset time point and the zero-crossing signal time point so as to realize the speed regulation of the fan.
It should be noted 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. The conduction pulse refers to a conduction pulse corresponding to the turning on of the thyristor or the solid-state relay.
And when the alternating current signal is in a positive half period, acquiring a first preset time point and a first feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the first feedback rotating speed, the first preset time point and the zero-crossing signal time point.
And when the alternating current signal is in a negative half period, acquiring a second preset time point and a second feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the second feedback rotating speed, the second preset time point and the zero-crossing signal time point.
It should be noted that the first preset time point is a time closer to the time of the zero-crossing signal entering the positive half-cycle, the second preset time point is a time closer to the time of the zero-crossing signal entering the negative half-cycle, and both the first preset time point and the second preset time point may be set to 1/8Tx, or may be set to other values, which is not limited in this embodiment.
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 zero-crossing signal time point is calculated according to the rising edge time point and the falling edge time point; and acquiring a preset time point and the feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the feedback rotating speed, the preset time point and the zero-crossing signal time point so as to realize the speed regulation of the fan. The real zero-crossing signal time point is calculated according to the characteristics of the alternating current signal time period so as to adjust the starting time point of the conduction pulse, and the conduction pulse width of a switching device such as a silicon controlled rectifier or a solid-state relay is dynamically adjusted, so that the problems that when the alternating current voltage is too low or the rotating speed of the fan is too high, the phase difference occurs between the current and the voltage, the conduction pulse is adjusted to be in an abnormal conduction range, and the fan stalls and reports faults are solved, and the speed regulation accuracy of the fan is improved.
Further, referring to fig. 4, fig. 4 is a detailed flowchart of step S20 when the ac signal is in the positive half period. Wherein, the step of S20 includes:
s21: calculating the starting time point of the conduction pulse according to the first feedback rotating speed;
it should be understood that the calculation method of the on time iPwidth of the conduction pulse may be calculated by a PID algorithm according to the feedback rotation speed, or may be other methods, which is not limited in this embodiment.
S22: when the starting time point is between the first preset time point and the zero-crossing signal time point when the negative half period is entered, adjusting the conduction pulse width to be a fixed conduction pulse width so as to adjust the starting time point by the fixed conduction pulse width;
referring to fig. 5, when the first feedback rotation speed is lower than the target rotation speed, the constant on pulse width t1 is used to control the on state of the thyristor or the solid-state relay to move to the first preset time point (i.e. move forward), so as to increase the on angle of the thyristor or the solid-state relay and increase the current fan rotation speed.
When the first feedback rotating speed is higher than the target rotating speed, the opening point of the silicon controlled rectifier or the solid-state relay is controlled to move (namely move backwards) to the zero-crossing signal time point when the negative half period is entered by the fixed conduction pulse width t1, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is reduced, and the current rotating speed of the fan is reduced.
The fixed on pulse width t1 may be a preset fixed value or a fixed value calculated by calculation, which is not limited in this embodiment.
S23: and when the starting time point is between the zero-crossing signal time point when the starting time point enters the positive half period and the first preset time point, adjusting the conduction pulse width to be a dynamic conduction pulse width so as to adjust the starting time point by the dynamic conduction pulse width.
When the first feedback rotating speed is lower than the target rotating speed, the opening time point is controlled to move (namely move forwards) to the zero-crossing signal time point when the positive half period is entered by the dynamic conduction pulse width t2, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is increased, and the current rotating speed of the fan is increased.
When the first feedback rotating speed is greater than the target rotating speed, the opening time point is controlled to move to a first preset time point (namely move backwards) by the dynamic conduction pulse width t2, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is reduced, and the current rotating speed of the fan is reduced.
The linear formula for the dynamic on pulse width t2 adjustment is: t2 ═ K × iPwidth + t 1; or using an index formula t2 ═ K × iPwidth < < n + iPwidth > > m + t 1; namely, when the opening time iPwidth of the conduction angle is closer to the time point of the zero-crossing signal entering the positive half period, the conduction pulse width is increased; and when the opening time iPwidth of the conduction angle is farther away from the zero-crossing signal time point when the positive half period is entered, reducing the conduction pulse width.
When the alternating current signal is in the negative half cycle, the step S20 includes: calculating the starting time point of the conduction pulse according to the second feedback rotating speed; when the starting time point is between the second preset time point and the zero-crossing signal time point when entering the next positive half period, the conducting pulse width is adjusted to be a fixed conducting pulse width, and the starting time point is adjusted to move by the fixed conducting pulse width; and when the starting time point is between the zero-crossing signal time point when the starting time point enters the negative half period and the second preset time point, adjusting the conduction pulse width to be a dynamic conduction pulse width so as to adjust the starting time point to move by the dynamic conduction pulse width.
Referring to fig. 6, when the turn-on time point is between the second preset time point and the zero-crossing signal time point when the next positive half cycle is entered:
and when the second feedback rotating speed is lower than the target rotating speed, controlling the on of the silicon controlled rectifier or the solid-state relay to move to the second preset time point (namely move forwards) by using the fixed conducting pulse width t1, so that the conducting angle of the silicon controlled rectifier or the solid-state relay is increased, and the current rotating speed of the fan is increased.
When the second feedback rotating speed is greater than the target rotating speed, the opening point of the silicon controlled rectifier or the solid-state relay is controlled to move (namely move backwards) towards the zero-crossing signal time point when entering the next positive half period by the fixed conduction pulse width t1, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is reduced, and the current rotating speed of the fan is reduced.
The fixed on pulse width t1 may be a preset fixed value or a fixed value calculated by calculation, which is not limited in this embodiment.
When the turn-on time point is between the zero-crossing signal time point when entering the negative half cycle and the second preset time point:
when the first feedback rotating speed is lower than the target rotating speed, the opening time point is controlled to move (namely move forwards) to the zero-crossing signal time point when the negative half period is entered by the dynamic conduction pulse width t2, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is increased, and the current rotating speed of the fan is increased.
When the first feedback rotating speed is greater than the target rotating speed, the opening time point is controlled to move to a second preset time point (namely move backwards) by the dynamic conduction pulse width t2, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is reduced, and the current rotating speed of the fan is reduced.
The linear formula for the dynamic on pulse width t2 adjustment is: t2 ═ K × iPwidth + t 1; or using an index formula t2 ═ K × iPwidth < < n + iPwidth > > m + t 1; namely, when the opening time iPwidth of the conduction angle is closer to the time point of the zero-crossing signal entering the negative half period, the conduction pulse width is increased; and when the opening time iPwidth of the conduction angle is farther away from the zero-crossing signal time point when entering the negative half period, reducing the conduction pulse width.
According to the embodiment, the movement of the opening time point is controlled by the fixed or dynamic conduction pulse width according to the relation between the opening time point and the zero-crossing signal time point, so that the problems that the phase difference between the current and the voltage occurs when the alternating voltage is too low or the rotating speed is too high, the adjustment of a silicon controlled rectifier or a solid-state relay fails and the blower stalls and reports the fault when the conduction angle is increased are effectively solved.
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 zero-crossing signal time point according to the rising edge time point and the falling edge time point;
the control module 20 is further configured to obtain a preset time point and a feedback rotation speed of the fan, and adjust a turn-on time point and a turn-on pulse width of the turn-on pulse according to the feedback rotation speed, the preset 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 thyristor or a solid-state relay, and the driving module 40 is connected with 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 thyristor or the solid-state relay 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 a rising edge of a zero-crossing signal, and recording the current time t0 (namely a rising edge time point);
step 2, detecting a falling edge of the zero-crossing signal, and recording the current time t1 (namely a falling edge time point);
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 (namely 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, 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. The conduction pulse refers to a conduction pulse corresponding to the turning on of the thyristor or the solid-state relay.
Specifically, when the alternating current signal is in a positive half period, a first preset time point and a first feedback rotating speed of the fan are obtained, and the starting time point and the conducting pulse width of the conducting pulse are adjusted according to the first feedback rotating speed, the first preset time point and the zero-crossing signal time point.
It should be noted that the first preset time point is a time point closer to the time point of the zero-crossing signal when entering the positive half cycle, and may be set to 1/8Tx, or may be set to another value, which is not limited in this embodiment.
It should be understood that the calculation method of the on time iPwidth of the conduction pulse may be calculated by a PID algorithm according to the feedback rotation speed, or may be other methods, which is not limited in this embodiment.
When the starting time point is between the first preset time point and the zero-crossing signal time point when the negative half period is entered, the conducting pulse width is adjusted to be a fixed conducting pulse width so as to adjust the starting time point by the fixed conducting pulse width.
When the first feedback rotating speed is lower than the target rotating speed, the opening of the silicon controlled rectifier or the solid-state relay is controlled to move to the first preset time point (namely move forwards) by the fixed conducting pulse width t1, so that the conducting angle of the silicon controlled rectifier or the solid-state relay is increased, and the current rotating speed of the fan is increased.
When the first feedback rotating speed is higher than the target rotating speed, the opening point of the silicon controlled rectifier or the solid-state relay is controlled to move (namely move backwards) to the zero-crossing signal time point when the negative half period is entered by the fixed conduction pulse width t1, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is reduced, and the current rotating speed of the fan is reduced.
The fixed on pulse width t1 may be a preset fixed value or a fixed value calculated by calculation, which is not limited in this embodiment.
In addition, when the starting time point is between the zero-crossing signal time point when the positive half period is entered and the first preset time point, the conducting pulse width is adjusted to be a dynamic conducting pulse width, and the starting time point is adjusted by the dynamic conducting pulse width.
When the first feedback rotating speed is lower than the target rotating speed, the opening time point is controlled to move (namely move forwards) to the zero-crossing signal time point when the positive half period is entered by the dynamic conduction pulse width t2, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is increased, and the current rotating speed of the fan is increased.
When the first feedback rotating speed is greater than the target rotating speed, the opening time point is controlled to move to a first preset time point (namely move backwards) by the dynamic conduction pulse width t2, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is reduced, and the current rotating speed of the fan is reduced.
The linear formula for the dynamic on pulse width t2 adjustment is: t2 ═ K × iPwidth + t 1; or using an index formula t2 ═ K × iPwidth < < n + iPwidth > > m + t 1; namely, when the opening time iPwidth of the conduction angle is closer to the time point of the zero-crossing signal entering the positive half period, the conduction pulse width is increased; and when the opening time iPwidth of the conduction angle is farther away from the zero-crossing signal time point when the positive half period is entered, reducing the conduction pulse width.
Further, when the alternating current signal is in a negative half period, a second preset time point and a second feedback rotating speed of the fan are obtained, and the starting time point and the conducting pulse width of the conducting pulse are adjusted according to the second feedback rotating speed, the second preset time point and the zero-crossing signal time point.
It should be noted that the second preset time point is a time point closer to the time point of the zero-crossing signal when entering the negative half cycle, and may be set to 1/8Tx, or may be set to another value, which is not limited in this embodiment.
It should be understood that the calculation method of the on time iPwidth of the conduction pulse may be calculated by a PID algorithm according to the feedback rotation speed, or may be other methods, which is not limited in this embodiment.
When the starting time point is between the second preset time point and the time point of the zero-crossing signal entering the next positive half period, the conducting pulse width is adjusted to be a fixed conducting pulse width, and the starting time point is adjusted by the fixed conducting pulse width;
and when the second feedback rotating speed is lower than the target rotating speed, controlling the on of the silicon controlled rectifier or the solid-state relay to move to the second preset time point (namely move forwards) by using the fixed conducting pulse width t1, so that the conducting angle of the silicon controlled rectifier or the solid-state relay is increased, and the current rotating speed of the fan is increased.
When the second feedback rotating speed is greater than the target rotating speed, the opening point of the silicon controlled rectifier or the solid-state relay is controlled to move (namely move backwards) towards the zero-crossing signal time point when entering the next positive half period by the fixed conduction pulse width t1, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is reduced, and the current rotating speed of the fan is reduced.
The fixed on pulse width t1 may be a preset fixed value or a fixed value calculated by calculation, which is not limited in this embodiment.
In addition, when the starting time point is between the zero-crossing signal time point when the starting time point enters the negative half period and the second preset time point, the conducting pulse width is adjusted to be a dynamic conducting pulse width, and the starting time point is adjusted by the dynamic conducting pulse width.
When the first feedback rotating speed is lower than the target rotating speed, the opening time point is controlled to move (namely move forwards) to the zero-crossing signal time point when the negative half period is entered by the dynamic conduction pulse width t2, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is increased, and the current rotating speed of the fan is increased.
When the first feedback rotating speed is greater than the target rotating speed, the opening time point is controlled to move to a second preset time point (namely move backwards) by the dynamic conduction pulse width t2, so that the conduction angle of the silicon controlled rectifier or the solid-state relay is reduced, and the current rotating speed of the fan is reduced.
The linear formula for the dynamic on pulse width t2 adjustment is: t2 ═ K × iPwidth + t 1; or using an index formula t2 ═ K × iPwidth < < n + iPwidth > > m + t 1; namely, when the opening time iPwidth of the conduction angle is closer to the time point of the zero-crossing signal entering the negative half period, the conduction pulse width is increased; and when the opening time iPwidth of the conduction angle is farther away from the zero-crossing signal time point when entering the negative half period, reducing the conduction pulse width.
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 zero-crossing signal time point is calculated according to the rising edge time point and the falling edge time point; and acquiring a preset time point and the feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the feedback rotating speed, the preset time point and the zero-crossing signal time point so as to realize the speed regulation of the fan. The real zero-crossing signal time point is calculated according to the characteristics of the alternating current signal time period so as to adjust the starting time point of the conduction pulse, and the conduction pulse width of a switching device such as a silicon controlled rectifier or a solid-state relay is dynamically adjusted, so that the problems that when the alternating current voltage is too low or the rotating speed of the fan is too high, the phase difference occurs between the current and the voltage, the conduction pulse is adjusted to be in an abnormal conduction range, and the fan stalls and reports faults are solved, 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 the zero-crossing signal time point according to the rising edge time point and the falling edge time point;
and acquiring a preset time point and the feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the feedback rotating speed, the preset 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 zero-crossing signal time point 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 regulation control method according to claim 4, wherein the step of obtaining a preset time point and a feedback rotation speed of the fan, and adjusting an on time point and an on pulse width of the on pulse according to the feedback rotation speed, the preset time point and the zero-crossing signal time point comprises:
when the alternating current signal is in a positive half period, acquiring a first preset time point and a first feedback rotating speed of a fan, and adjusting the starting time point and the conducting pulse width of a conducting pulse according to the first feedback rotating speed, the first preset time point and the zero-crossing signal time point;
and when the alternating current signal is in a negative half period, acquiring a second preset time point and a second feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the second feedback rotating speed, the second preset time point and the zero-crossing signal time point.
6. The fan speed regulation control method according to claim 5, wherein the step of adjusting the on-time point and the on-pulse width of the on-pulse according to the first feedback rotation speed, the first preset time point and the zero-crossing signal time point comprises:
calculating the starting time point of the conduction pulse according to the first feedback rotating speed;
when the starting time point is between the first preset time and the zero-crossing signal time point when the negative half period is entered, adjusting the conduction pulse width to be a fixed conduction pulse width so as to adjust the starting time point by the fixed conduction pulse width;
and when the starting time point is between the zero-crossing signal time point when the starting time point enters the positive half period and the first preset time point, adjusting the conduction pulse width to be a dynamic conduction pulse width so as to adjust the starting time point by the dynamic conduction pulse width.
7. The fan speed control method of claim 6, wherein the step of adjusting the turn-on time point with a fixed turn-on pulse width comprises:
when the first feedback rotating speed is lower than the target rotating speed, controlling the starting time point to move to the first preset time point by using a fixed conduction pulse width;
and when the first feedback rotating speed is greater than the target rotating speed, controlling the starting time point to move to the zero-crossing signal time point when the negative half period is entered by using a fixed conduction pulse width.
8. The fan speed control method of claim 6, wherein the step of adjusting the turn-on time point with a dynamic on pulse width comprises:
when the first feedback rotating speed is lower than the target rotating speed, increasing the conducting pulse width and controlling the starting time point to move to the zero-crossing signal time point when the positive half period is entered;
and when the first feedback rotating speed is greater than the target rotating speed, reducing the conduction pulse width and controlling the starting time point to move to the first preset time point.
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 zero-crossing signal time point according to the rising edge time point and the falling edge time point;
the control module is further used for acquiring a preset time point and a feedback rotating speed of the fan, and adjusting the starting time point and the conducting pulse width of the conducting pulse according to the feedback rotating speed, the preset 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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