CN110617235B - Method and device for controlling fan flow, computer equipment and readable storage medium - Google Patents
Method and device for controlling fan flow, computer equipment and readable storage medium Download PDFInfo
- Publication number
- CN110617235B CN110617235B CN201910778951.4A CN201910778951A CN110617235B CN 110617235 B CN110617235 B CN 110617235B CN 201910778951 A CN201910778951 A CN 201910778951A CN 110617235 B CN110617235 B CN 110617235B
- Authority
- CN
- China
- Prior art keywords
- power amplifier
- temperature
- temperature variation
- fan
- time window
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
Abstract
The application relates to a method, a device, computer equipment and a readable storage medium for controlling fan flow, wherein the method for controlling the fan flow comprises the following steps: setting a time window within the working time range of the power amplifier; acquiring the actual temperature variation of the power amplifier in a time window; and adjusting the air flow of the fan according to the actual temperature variation so as to stabilize the temperature of the power amplifier. According to the method for controlling the air flow of the fan, the air flow of the fan is accurately adjusted according to the temperature rise speed of the power amplifier, and the condition of excessive air flow cannot occur, so that the temperature of the power amplifier cannot fluctuate due to overlarge or undersize air flow, and the power amplifier can be always stably at the same working temperature.
Description
Technical Field
The invention relates to the field of fan control systems, in particular to a method and a device for controlling fan flow, computer equipment and a readable storage medium.
Background
The power amplifier is not only applied to the field of low power such as audio frequency, household appliances and the like, but also has wide application in industry. In high power applications, the reliability and the service life of various power amplifiers and loudspeakers are determined by the heat dissipation conditions.
At present, the temperature of the power amplifier between 100-300W power is usually controlled by a radiator or a mode of combining the radiator with a fan, as shown in fig. 1, without considering the influence of the actual temperature of the power amplifier and the ambient temperature, so that the fan is always in the maximum air flow state. Although the method can ensure that the temperature of the power amplifier is in a normal working range, the temperature of the power amplifier is unstable, and the fan is in a working state with the highest air volume for a long time, so that the service life of the fan is influenced. An improved method for controlling the air flow of a fan is provided at present, which adjusts the air flow of the fan according to the actual temperature of a power amplifier. However, the temperature of the power amplifier is unstable and fluctuates.
Disclosure of Invention
The application provides a method for controlling fan flow, which can accurately control the fan flow and ensure that the temperature of a power amplifier is kept stable.
A method of controlling fan airflow, the method comprising:
setting a time window within the working time range of the power amplifier;
acquiring the actual temperature variation of the power amplifier in the time window;
and adjusting the air flow of the fan according to the actual temperature variation so as to stabilize the temperature of the power amplifier.
In an embodiment, the adjusting the wind flow of the fan according to the actual temperature variation includes:
if the temperature variation of the power amplifier in the time window exceeds a preset threshold, calculating a corresponding predicted temperature variation when the temperature of the power amplifier rises to be stable;
and adjusting the air flow of the fan according to the predicted temperature variation so as to stabilize the temperature of the power amplifier.
In an embodiment, the adjusting the wind flow of the fan according to the predicted temperature variation to stabilize the temperature of the power amplifier includes:
acquiring a mapping relation between the temperature variation and the duty ratio of the fan;
searching a mapping relation between the temperature variation and the fan duty ratio according to the predicted temperature variation to obtain a target duty ratio;
and adjusting the duty ratio of the fan to a target duty ratio so as to stabilize the temperature of the power amplifier.
In an embodiment, the adjusting the duty cycle of the fan to the target duty cycle includes:
acquiring a corresponding step length according to the actual temperature variation and the time window width;
and adjusting the duty ratio of the fan to the target duty ratio according to the step length.
In an embodiment, after adjusting the wind flow of the wind turbine according to the predicted temperature variation to stabilize the temperature of the power amplifier, the method further includes:
if the temperature variation of the power amplifier in the time window does not exceed a preset threshold, acquiring a target duty ratio corresponding to the actual temperature value according to the actual temperature variation and the mapping relation;
and adjusting the duty ratio of the fan to the target duty ratio so as to stabilize the temperature of the power amplifier.
In an embodiment, the time window includes at least one time window, and the widths of the time windows increase sequentially.
In an embodiment, the adjusting the wind flow of the fan according to the actual temperature variation includes:
acquiring the temperature variation of the power amplifier within a certain time window;
if the temperature variation exceeds a preset threshold, calculating the predicted temperature variation when the temperature of the power amplifier rises to a temperature stable state; adjusting the air flow of the fan according to the predicted temperature variation;
if the temperature variation does not exceed the preset threshold, acquiring the temperature variation of the next time window, and judging whether the temperature variation exceeds the preset threshold;
and if the temperature variation in each time window does not exceed the preset threshold, determining that the temperature of the power amplifier is in a stable state.
In an embodiment, if the amount of temperature change in each time window does not exceed the preset threshold, determining that the temperature of the power amplifier is in a stable state further includes:
acquiring a target duty ratio corresponding to the actual temperature quantity according to the actual temperature variation and the mapping relation between the temperature variation and the fan duty ratio;
and adjusting the duty ratio of the fan to the target duty ratio so as to stabilize the temperature of the power amplifier.
An apparatus for controlling fan airflow, the apparatus comprising:
the setting module is used for setting a time window in the working time range of the power amplifier;
the obtaining module is used for obtaining the actual temperature variation of the power amplifier in the time window;
and the adjusting module is used for adjusting the air flow of the fan according to the actual temperature variation so as to stabilize the temperature of the power amplifier.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the above method when executing the computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method. .
The method, the device, the computer equipment and the readable storage medium for controlling the fan flow, provided by the embodiment of the application, comprise the steps of setting a time window in the working time range of a power amplifier; acquiring the actual temperature variation of the power amplifier in the time window; and adjusting the air flow of the fan according to the actual temperature variation so as to stabilize the temperature of the power amplifier. According to the method for controlling the air flow of the fan, the air flow of the fan is accurately adjusted according to the temperature rise speed of the power amplifier, and the condition of excessive air flow cannot occur, so that the temperature of the power amplifier cannot fluctuate due to overlarge or undersize air flow, and the power amplifier can be always stably at the same working temperature.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a system for controlling the temperature of a power amplifier according to an embodiment;
FIG. 2 is a flow chart of a method for controlling fan airflow according to an embodiment;
fig. 3 is a flowchart illustrating adjusting an air flow of the fan according to the predicted temperature variation to stabilize the temperature of the power amplifier according to an embodiment;
FIG. 4 is a graph of fan duty cycle versus temperature change for a power amplifier at steady state according to an embodiment;
FIG. 5 is a graph illustrating a relationship between a duty cycle and an airflow rate of a wind turbine according to an embodiment;
FIG. 6 is a flow chart illustrating adjusting the duty cycle of the fan to a target duty cycle according to an embodiment;
FIG. 7 is a graph of temperature rise test data for a power amplifier according to one embodiment;
FIG. 8 is a flow chart of a method for controlling fan airflow according to another embodiment;
FIG. 9 is a schematic structural diagram of an apparatus for controlling wind flow of a wind turbine according to an embodiment;
fig. 10 is an internal structural diagram of a computer device according to an embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to provide a thorough understanding of the present application, and in the accompanying drawings, preferred embodiments of the present application are set forth. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the description of the present application, "a number" means at least one, such as one, two, etc., unless specifically limited otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Fig. 2 is a flowchart of a method for controlling a fan air flow according to an embodiment, and as shown in fig. 2, the method for controlling the fan air flow includes steps 210 to 230, where:
After the power amplifier is started, the temperature of the power amplifier is constantly changed, and generally, the temperature of the power amplifier is constantly increased along with the increase of the working time. In order to comprehensively and completely obtain the temperature change state of the power amplifier from the global angle, the number of the time windows can be multiple by setting the time windows, and the current temperature state of the power amplifier is obtained through the temperature rise change speed of the power amplifier in the multiple time windows. The temperature state of the power amplifier includes a rising state, a steady state, and a falling state.
Firstly, in the whole working time period, the temperature value of the power amplifier is detected and recorded at preset time intervals. Then, a first temperature value of the power amplifier at a certain moment is obtained, and then a time window before the moment is obtainedAnd acquiring the actual temperature variation of the power amplifier in the time window according to the first temperature value and the second temperature value corresponding to the wide moment. For example, the time window is set to 5s, and the time T of the acquired first temperature value T1 of the power amplifier is T0Then get t 8s0Time t preceding the time window width1And when the second temperature value T2 corresponds to 3s, the actual temperature change Δ T1 of the power amplifier in the time window is T1-T2.
As an example, the preset time may be 1 second, that is, the temperature value of the power amplifier is detected every 1 second. Experiments show that even if the power amplifier works under the maximum power and the fan is turned off, the temperature rise of the power amplifier within 1 second does not change obviously. According to practical conditions, the preset time is generally not longer than 5 seconds.
After the actual temperature variation Δ T1 is obtained, if Δ T1 exceeds a preset threshold, a corresponding predicted temperature variation when the temperature of the power amplifier rises to a steady state is calculated. And adjusting the air flow of the fan according to the predicted temperature variation to inhibit the temperature rise of the power amplifier.
Specifically, if it is detected that the actual temperature variation Δ T1 of the power amplifier within the time window exceeds the preset threshold, it indicates that the power amplifier is in the temperature-raising period currently. According to the temperature variation and the fan duty ratio curve measured by a plurality of tests, if the duty ratio of the fan is kept unchanged, when the temperature of the power amplifier is raised to a stable state, the temperature of the power amplifier is higher than the current temperature value by a temperature degree. For example, when it is detected that the actual temperature variation Δ T1 of the power amplifier within the time window exceeds a preset threshold, for example, the preset threshold may be 0.25 degrees, which indicates that the current temperature of the power amplifier is in a fast temperature rise period, if the duty ratio of the fan is kept unchanged, when the temperature of the power amplifier rises to a steady state, the temperature of the power amplifier is 10 degrees higher than the current temperature value, that is, the predicted temperature variation is obtained. And then adjusting the air flow of the fan according to the predicted temperature variation, so that the temperature of the power amplifier can be controlled more quickly and accurately, and the temperature of the power amplifier is kept stable.
It should be noted that, because the structures and the heat dissipation coefficients of various devices are different, the measured curves have differences, and therefore, it is necessary to separately test the temperature variation and the fan duty cycle curve for different devices, and the same curve can be used for the same device.
The method for controlling the flow of the fan provided by the embodiment comprises the following steps: setting a time window within the working time range of the power amplifier; acquiring the actual temperature variation of the power amplifier in a time window; and adjusting the air flow of the fan according to the actual temperature variation so as to stabilize the temperature of the power amplifier. The application provides a method for controlling fan air flow, according to power amplifier's the air flow of the accurate adjustment fan of the temperature rate of rise, the excessive condition of air flow can not appear, therefore power amplifier's temperature can not appear fluctuating and changing because of the too big or undersize of air flow, can solve the unstable problem of power amplifier radiating process in temperature, make power amplifier be in same operating temperature all the time, no matter power change or ambient temperature change, as long as in controllable within range, can both keep power amplifier's constant temperature work. In addition, the power amplifier is kept to work at a constant temperature by accurately controlling the air flow of the fan, so that the static current and the gain of the power amplifier are constant, and the nonlinear influence on the power amplifier caused by temperature change can be weakened. Because temperature change can cause the quiescent current change of power amplifier, the quiescent current of power amplifier determines factors such as gain of power amplifier to lead to the gain of power amplifier unstable, cause nonlinearity. Moreover, the fan can be used for carrying out relatively stable air flow adjustment according to temperature change, so that the fan can be always in a relatively proper air flow state, and the service life of the fan can be prolonged.
It should be noted that, the method for controlling the wind flow of the fan preferably uses a scientific algorithm to control the fan, so as to reduce damage to the fan due to the instantaneous increase or decrease of the wind flow.
In one embodiment, as shown in fig. 3, adjusting the wind flow of the wind turbine according to the predicted temperature variation to suppress the temperature rise of the power amplifier includes steps 310 to 330, where:
and 310, acquiring a mapping relation between the temperature variation and the duty ratio of the fan.
Referring to fig. 4, fig. 4 is a graph illustrating a fan duty ratio versus a temperature variation of a power amplifier in a steady state. Different temperature variations correspond to different fan duty cycles.
It should be noted that the temperature change amount here is not a temperature change amount in the change process, but a corresponding temperature change amount when the temperature of the power amplifier rises to a steady state. The temperature variation specifically refers to a difference between a temperature value at which the temperature of the power amplifier is in a steady state and a target temperature value. The target temperature value is a temperature value at which the power amplifier is in stable operation, and is recorded as Tg, and the whole control flow is adjusted around the value. After the predicted temperature variation is obtained, a temperature value corresponding to the temperature of the power amplifier rising to the stable state can be further obtained according to the predicted temperature variation, then a difference value between the temperature value corresponding to the temperature of the power amplifier rising to the stable state and the target temperature value Tg is obtained, and the difference value is used as the temperature variation needing to be adjusted.
The duty cycle and the air flow of the fan are monotonous, as shown in fig. 5. After the same model is tested and determined, the mapping relation is fixed, the mapping relation of the same model uses the same set of mapping parameters, and the mapping relation table can be tested and cured by the first test.
And 320, searching a mapping relation between the temperature variation and the duty ratio of the fan according to the predicted temperature variation to obtain a target duty ratio.
And 330, adjusting the duty ratio of the fan to a target duty ratio so as to stabilize the temperature of the power amplifier.
Fig. 4 is drawn according to the experimental data, and as can be seen from fig. 4, the horizontal axis represents the duty ratio of the fan, the vertical axis represents the relative temperature rise, the temperatures of the vertical axes in fig. 4 are relative values based on the temperature at 100% duty ratio, and the difference between the relative values is taken as the standard when the temperature needs to be adjusted at different duty ratios. The smaller the duty ratio of the fan is, the smaller the wind flow is, and the higher the temperature variation of the power amplifier in a stable state is. The temperature rise difference between different duty ratios of the fan can be calculated by using fig. 4, for example, when the duty ratio of the fan is 20%, if the temperature of the power amplifier in the stable state is 6 degrees higher than the target temperature value, the temperature of the power amplifier in the stable state needs to be reduced by 6 degrees, and at this time, the duty ratio of the fan needs to be correspondingly adjusted to 38%.
The motor for controlling the wind flow of the fan needs to accurately control the wind flow of the fan, and the controllable range of the motor can cover the range of the working temperature of the whole power amplifier, so that the power amplifier cannot be burnt down due to continuous temperature rise under the maximum wind flow state.
In one embodiment, as shown in fig. 6, adjusting the duty cycle of the fan to the target duty cycle includes steps 610 and 620, wherein:
and step 610, acquiring a corresponding step length according to the actual temperature variation and the time window width.
And step 620, adjusting the duty ratio of the fan to a target duty ratio according to the step length.
The power amplifier is provided with a plurality of time windows with different window widths in the working time range, the same actual temperature variation in the time windows with different window widths can indicate that the temperature of the power amplifier is in different states, and the smaller the time window width is, the faster the temperature of the power amplifier rises, and at the moment, the temperature of the power amplifier needs to be rapidly controlled. Therefore, on the premise of the same actual temperature variation, the smaller the time window width is, the larger the corresponding step length is; the larger the time window width, the smaller the corresponding step size.
For the same type of device, a number of different time windows are set, for example 5s, 10s and 30s, respectively. If the temperature rises by 0.25 ℃ in the time window of 5s, the temperature variation is predicted to be 10 ℃ according to the curve relation between the temperature variation and the duty ratio, and the duty ratio of the fan is rapidly adjusted to the target duty ratio by adopting corresponding step length, so that the temperature of the power amplifier is reduced by 10 ℃ before the temperature of the power amplifier is stable; similarly, if the temperature rises by 0.25 ℃ in the time windows of 10s and 30s and the predicted temperature change is 5 ℃ and 2 ℃ according to the relation between the actual temperature change and the duty ratio, the duty ratio of the fan is adjusted to the target duty ratio by adopting the corresponding step length, so that the temperature of the power amplifier is reduced by 5 ℃ and 2 ℃ before the temperature of the power amplifier is stabilized;
or, for different types of devices, setting the same time window, for example, the time windows are all 5s, if one device rises in temperature by 0.25 ℃ within the time window, the other device rises in temperature by 0.2 ℃ within the time window; and predicting the temperature variation among different devices according to the relationship between the temperature variation and the duty ratio, and adjusting the duty ratio of the fan to a target duty ratio by adopting a corresponding step length so as to reduce the temperature of the power amplifier by a corresponding degree before the temperature of the power amplifier is stable.
The specific step length can be set according to the size of the time window, the temperature rise in the time window and the property of the equipment, and by referring to the curve relation between the temperature variation and the duty ratio of the fan. It can be understood that, under the condition that other conditions are consistent, for the same time window, the larger the temperature rise is, the larger the step size is correspondingly; under the condition that other conditions are consistent, the smaller the time window is, the larger the step length is correspondingly for the same temperature rise.
It should be noted that the actual temperature variation of the power amplifier within the time window is obtained in real time, and the position of the time window is also dynamically changed. For example, the time window is set to 5s, and the time T of the acquired first temperature value T1 of the power amplifier is T0Then get t 8s0Time t preceding the time window width1And when the second temperature value T2 corresponds to 3s, the actual temperature change Δ T1 of the power amplifier in the time window is T1-T2. And if the delta T1 is larger than the preset threshold, adjusting the target duty ratio to which the fan is adjusted according to the mapping relation between the temperature variation and the fan duty ratio. And in the adjusting process, acquiring the temperature variation in the time window 5s in real time, and adjusting the step length in real time.
In the embodiment, the wind flow of the fan can be accurately adjusted according to actual conditions, and a fixed step value or a step value of a plurality of stages is not used. But rather a dynamically variable value. When the temperature slowly fluctuates, the air flow of the fan is kept unchanged in a short time, and the constant temperature effect is assisted. The temperature stability of the power amplifier is poor because the fluctuation change speed is accelerated if the wind flow of the fan is changed during slow fluctuation.
In one embodiment, after adjusting the wind flow of the wind turbine according to the predicted temperature variation to suppress the temperature rise of the power amplifier, the method further includes:
if the temperature variation of the power amplifier in the time window does not exceed a preset threshold, acquiring a target duty ratio corresponding to an actual temperature value according to the actual temperature variation and the mapping relation;
and adjusting the duty ratio of the fan to a target duty ratio so as to stabilize the temperature of the power amplifier.
If the temperature variation of the power amplifier in the time window does not exceed the preset threshold, the temperature of the power amplifier is in a stable state, and at the moment, the duty ratio of the fan can be directly adjusted to the target duty ratio according to the mapping relation between the temperature variation and the duty ratio of the fan.
In one embodiment, at least one time window is included, and the width of each time window increases in turn. Specifically, the time window may include a first time window, a second time window and a third time window, where the first time window is smaller than the second time window, and the second time window is smaller than the third time window.
Different time windows characterize the speed, duration and stability of the temperature rise. The air flow of the fan can be comprehensively and completely controlled from the global angle by setting a plurality of time windows, and the temperature stability of the power amplifier is ensured.
In an embodiment, as shown in fig. 8, adjusting the wind flow of the fan according to the actual temperature variation includes steps 810 to 870, where:
In step 840, if the temperature variation in each time window does not exceed the preset threshold, it is determined that the temperature of the power amplifier is in a stable state.
In an embodiment, if the temperature variation in each time window does not exceed the preset threshold, determining that the temperature of the power amplifier is in the steady state further includes:
acquiring a target duty ratio corresponding to the actual temperature quantity according to the actual temperature variation and the mapping relation between the temperature variation and the duty ratio of the fan;
and adjusting the duty ratio of the fan to a target duty ratio so as to stabilize the temperature of the power amplifier.
The whole control process fan can be divided into three working states: a uniform velocity state, an acceleration state and a deceleration state.
In the initial stage of starting the fan, the air flow of the fan can be adjusted to be maximum, and meanwhile, the fan is set to be in a constant speed state, and speed adjustment is started after the output power is stable and the temperature of the power amplifier is stable.
When the fan is in a constant speed state, if the temperature variation of the power amplifier is detected to be higher than the target temperature value Tg by a preset degree, the fan enters an acceleration state, if the temperature variation is lower than the target temperature value Tg by the preset degree, the fan enters a deceleration state, and if the temperature variation is not higher than the target temperature value Tg by the preset degree, the fan is still in the constant speed state. And similarly, in the acceleration state, if the temperature enters the stable state, the constant speed state is returned, if the temperature is lower than Tg by a preset degree, the deceleration state is entered, and if not, the acceleration state is left. The deceleration state is also switched similarly, and the description of this embodiment is omitted. The preset degree can be selected according to actual conditions, and in the embodiment, the preset degree is selected to be 2 degrees.
The specific adjustment process of the fan air flow is as follows, and the first time window, the second time window and the third time window are respectively 5 seconds, 10 seconds and 30 seconds for the example of the present embodiment.
Firstly, a time window of 5 seconds is determined, and if the temperature of the power amplifier is detected to rise over a preset threshold value within 5 seconds, the current rapid temperature rise period is indicated. In this embodiment, the preset threshold is set to 0.25 degrees. According to the measured curve of the temperature variation and the duty ratio of the fan, if the duty ratio is not changed at the moment, when the temperature of the power amplifier rises to be stable, the temperature is 10 degrees higher than the current temperature value, and at the moment, the duty ratio needs to be increased according to the temperature rise relation of fig. 4 so as to reduce the temperature of the power amplifier by 10 degrees when the power amplifier is stable. At this time, the temperature of 0.25 corresponds to 10 degrees, and when the temperature rise in different time windows exceeds a preset threshold value, the duty ratio required to be adjusted can be accurately calculated according to an actual value.
Secondly, if the temperature rise in the 5 second time window does not exceed the preset threshold, further judging the temperature rise in the 10 second time window, if the temperature rise in the 10 second time window exceeds 0.25 ℃, also considering that the power amplifier temperature is still in the rising period at the moment, judging according to a curve of the measured temperature variation and the fan duty ratio that the temperature rise is 5 ℃ when the power amplifier temperature is stable, and adjusting the fan duty ratio according to the graph of fig. 4. Similarly, if the time window of 30 seconds exceeds 0.25 ℃, the temperature rise of the power amplifier when the temperature is stable is 5 ℃, and the duty ratio of the fan is adjusted according to fig. 4, so that the temperature of the power amplifier is reduced by 2 degrees. If the temperature values of the three time windows do not exceed the preset threshold, the current temperature of the power amplifier is judged to be in a stable state, and the duty ratio is adjusted according to the difference value of the current temperature value Tc and Tg and according to the graph 6, so that the temperature of the power amplifier gradually approaches to Tg and is stabilized near Tg.
For the deceleration state, the duty ratio is adjusted according to fig. 6 according to the difference between the current temperature Tc and Tg when the temperature value is at a stable value. Since there is no dangerous state of rapid temperature rise at this time, it can be calculated from the steady value, as in the temperature steady-state operation at the time of speed increase. If the temperature is in the rapid cooling state, the air flow is not adjusted until the steady state is adjusted.
In summary, when the temperature rapidly rises, it is necessary to rapidly suppress the rising process according to the curve. Then the temperature is adjusted to Tg, and the process needs to be adjusted when the temperature is stable and cannot be adjusted in the process of temperature change, otherwise, fluctuation is caused, and the temperature is unstable.
The window width of the time window can be obtained according to the following method. From the graph of fig. 7, the time versus temperature rise curve can be obtained as follows:
The temperature rise within the time window dt (dt < < τ) can be simplified to:
Let the resolution of the sensor be RT2The temperature change that can be detected should be satisfied
Wherein Δ T is the maximum value of temperature rise due to external environment, heat dissipation condition or thermal power change, and is determined by the working condition, and once Δ T is determined, the temperature rise is determined
The minimum value of the time window is also determined therewith.
In addition, from the viewpoint of the temperature rise of the envelope, the thermal response time constant is set to τcThe time function of the case temperature is then:
in the same way, the method for preparing the composite material,
the temperature rise of the tube shell in the time window is
Setting allowable temperature rise of tube shell to Tc_safeThen, then
Namely, it is
Is composed of
The upper limit of (3).
In summary,
to determine the upper time window limit, the thermal response time constant of the envelope needs to be determined. The experimental results show that: the drain of the tube takes about 250 seconds to heat from 26 degrees to 67 degrees and then substantially stabilizes. And (4) measuring according to an exponential rule, wherein the thermal response time constant is about 50 seconds. The time constant of the die and the package should be on the same order of magnitude, conservatively taken to be 10 seconds.
The resolution of temperature in the current system is 0.25 degrees (the actual resolution is 0.0625, and is 4 times to avoid the influence of noise and interference), tau is 180 seconds, taucThe temperature resolution can be increased by using a temperature sensor with higher accuracy, of course, for 10 seconds. Then (1) is:
so Tc_safeThe content of the active ingredients is more than or equal to 5. For safety, take Tc_safeAfter substituting the above equation, the time window size can be determined for different temperature changes, as shown in the following table:
| ΔT | lower limit of dt |
| 2 | 22.5 |
| 5 | 9 |
| 10 | 4.5 |
| 20 | 2.25 |
Therefore, when the preset threshold is 0.25 degrees, the temperature rise of the power amplifier when the temperature of the power amplifier corresponding to the 5-second time window is stable is 10 degrees, the temperature rise of the power amplifier corresponding to the 10-second time window is 5 degrees, and the temperature rise of the power amplifier corresponding to the 30-second time window is 2 degrees. If the conditions allow adjustment of 20 degrees of temperature rise corresponding to 2-3 seconds can be added on the basis, but according to fig. 1, the temperature range which can be adjusted by the current system is 18 degrees at most, so the 2-3 second time window corresponding to 20 degrees is not in the adjustable range.
It should be understood that, although the steps in the flowcharts of fig. 2, 3, 6 and 7 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2, 3, 6, and 7 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 9, there is provided an apparatus for controlling fan airflow, comprising: a setting module 910, an obtaining module 920, and an adjusting module 930, wherein:
a setting module 910, configured to set a time window within an operating time range of the power amplifier;
an obtaining module 920, configured to obtain an actual temperature variation of the power amplifier within a time window;
and an adjusting module 930, configured to adjust an air flow of the fan according to the actual temperature variation, so as to stabilize the temperature of the power amplifier.
In an embodiment, the adjusting module 930 adjusting the wind flow of the fan according to the actual temperature variation includes:
if the temperature variation of the power amplifier in the time window exceeds a preset threshold, calculating the corresponding predicted temperature variation when the temperature of the power amplifier rises to be stable;
and adjusting the air flow of the fan according to the predicted temperature variation to inhibit the temperature rise of the power amplifier.
In an embodiment, the adjusting module 930 adjusting the wind flow of the wind turbine according to the predicted temperature variation to suppress the temperature rise of the power amplifier includes:
acquiring a mapping relation between the temperature variation and the duty ratio of the fan;
searching a mapping relation between the temperature variation and the duty ratio of the fan according to the predicted temperature variation to obtain a target duty ratio;
and adjusting the duty ratio of the fan to a target duty ratio so as to stabilize the temperature of the power amplifier.
In an embodiment, the adjusting module 930 adjusting the duty cycle of the fan to the target duty cycle includes:
acquiring a corresponding step length according to the actual temperature variation and the time window width;
and adjusting the duty ratio of the fan to the target duty ratio according to the step length.
In an embodiment, after adjusting the air flow of the fan according to the predicted temperature variation to suppress the temperature rise of the power amplifier, if the temperature variation of the power amplifier in the time window does not exceed the preset threshold, the adjusting module 930 obtains the target duty ratio corresponding to the actual temperature value according to the actual temperature variation and the mapping relationship; and adjusting the duty ratio of the fan to a target duty ratio so as to stabilize the temperature of the power amplifier.
In one embodiment, the setting module 910 sets the time window to a plurality of time windows, and widths of the plurality of time windows are sequentially increased.
In an embodiment, the adjusting module 930 adjusting the wind flow of the fan according to the actual temperature variation includes:
acquiring the temperature variation of the power amplifier within a certain time window;
if the temperature variation exceeds a preset threshold, calculating the predicted temperature variation when the temperature of the power amplifier rises to a temperature stable state; adjusting the air flow of the fan according to the predicted temperature variation;
if the temperature variation does not exceed the preset threshold, acquiring the temperature variation of the next time window, and judging whether the temperature variation exceeds the preset threshold;
and if the temperature variation in each time window does not exceed the preset threshold, determining that the temperature of the power amplifier is in a stable state.
In an embodiment, if the temperature variation of each time window does not exceed the preset threshold, after determining that the temperature of the power amplifier is in a stable state, the adjusting module 930 obtains a target duty ratio corresponding to the actual temperature according to the actual temperature variation and the mapping relationship between the temperature variation and the fan duty ratio; and adjusting the duty ratio of the fan to a target duty ratio so as to stabilize the temperature of the power amplifier.
For specific limitations of the device for controlling the fan air flow, reference may be made to the above limitations of the method for controlling the fan air flow, and details thereof are not repeated here. All modules in the device for controlling the air flow of the fan can be completely or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 10. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of controlling fan airflow. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 10 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In an embodiment, there is provided a computer device comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the following steps when executing the computer program:
setting a time window within the working time range of the power amplifier;
acquiring the actual temperature variation of the power amplifier in a time window;
and adjusting the air flow of the fan according to the actual temperature variation so as to stabilize the temperature of the power amplifier.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
setting a time window within the working time range of the power amplifier;
acquiring the actual temperature variation of the power amplifier in a time window;
and adjusting the air flow of the fan according to the actual temperature variation so as to stabilize the temperature of the power amplifier.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of controlling fan airflow, the method comprising:
setting a time window within the working time range of the power amplifier;
acquiring the actual temperature variation of the power amplifier in the time window;
adjusting the air flow of the fan according to the actual temperature variation to stabilize the temperature of the power amplifier; the adjusting of the air flow of the fan according to the actual temperature variation comprises: if the actual temperature variation of the power amplifier in the time window exceeds a preset threshold, calculating a corresponding predicted temperature variation when the temperature of the power amplifier rises to be stable; and adjusting the air flow of the fan according to the predicted temperature variation so as to stabilize the temperature of the power amplifier.
2. The method of claim 1, wherein the adjusting the wind flow of the wind turbine to stabilize the temperature of the power amplifier based on the predicted temperature change comprises:
acquiring a mapping relation between the temperature variation and the duty ratio of the fan;
searching a mapping relation between the temperature variation and the fan duty ratio according to the predicted temperature variation to obtain a target duty ratio;
and adjusting the duty ratio of the fan to a target duty ratio so as to stabilize the temperature of the power amplifier.
3. The method of claim 2, wherein the adjusting the duty cycle of the fan to the target duty cycle comprises:
acquiring a corresponding step length according to the actual temperature variation and the time window width;
and adjusting the duty ratio of the fan to the target duty ratio according to the step length.
4. The method of claim 2, wherein after adjusting the wind flow of the wind turbine to stabilize the temperature of the power amplifier based on the predicted temperature change, the method further comprises:
if the actual temperature variation of the power amplifier in the time window does not exceed a preset threshold, acquiring a target duty ratio corresponding to the actual temperature variation according to the actual temperature variation and the mapping relation;
and adjusting the duty ratio of the fan to the target duty ratio so as to stabilize the temperature of the power amplifier.
5. The method of claim 1, wherein the time windows comprise at least one time window, and wherein the width of each of the time windows increases sequentially.
6. The method of claim 5, wherein the adjusting the wind flow of the wind turbine according to the actual temperature change comprises:
acquiring the actual temperature variation of the power amplifier within a certain time window;
if the actual temperature variation exceeds a preset threshold, calculating the predicted temperature variation when the temperature of the power amplifier rises to a temperature stable state; adjusting the air flow of the fan according to the predicted temperature variation;
if the actual temperature variation does not exceed the preset threshold, acquiring the actual temperature variation of the next time window, and judging whether the actual temperature variation exceeds the preset threshold;
and if the actual temperature variation in each time window does not exceed the preset threshold, determining that the temperature of the power amplifier is in a stable state.
7. The method of claim 6, wherein determining that the temperature of the power amplifier is in a steady state if the actual temperature variation in each time window does not exceed the preset threshold further comprises:
acquiring a target duty ratio corresponding to the actual temperature variation according to the actual temperature variation and the mapping relation between the temperature variation and the fan duty ratio;
and adjusting the duty ratio of the fan to the target duty ratio so as to stabilize the temperature of the power amplifier.
8. A device for controlling fan airflow, the device comprising:
the setting module is used for setting a time window in the working time range of the power amplifier;
the obtaining module is used for obtaining the actual temperature variation of the power amplifier in the time window;
the adjusting module is used for adjusting the air flow of the fan according to the actual temperature variation so as to stabilize the temperature of the power amplifier; the adjusting of the air flow of the fan according to the actual temperature variation comprises: if the actual temperature variation of the power amplifier in the time window exceeds a preset threshold, calculating a corresponding predicted temperature variation when the temperature of the power amplifier rises to be stable; and adjusting the air flow of the fan according to the predicted temperature variation so as to stabilize the temperature of the power amplifier.
9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910778951.4A CN110617235B (en) | 2019-08-22 | 2019-08-22 | Method and device for controlling fan flow, computer equipment and readable storage medium |
| PCT/CN2020/108892 WO2021031971A1 (en) | 2019-08-22 | 2020-08-13 | Method and device for controlling flow rate of fan, computer apparatus, and readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910778951.4A CN110617235B (en) | 2019-08-22 | 2019-08-22 | Method and device for controlling fan flow, computer equipment and readable storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110617235A CN110617235A (en) | 2019-12-27 |
| CN110617235B true CN110617235B (en) | 2021-06-08 |
Family
ID=68922348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910778951.4A Active CN110617235B (en) | 2019-08-22 | 2019-08-22 | Method and device for controlling fan flow, computer equipment and readable storage medium |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110617235B (en) |
| WO (1) | WO2021031971A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110617235B (en) * | 2019-08-22 | 2021-06-08 | 三维通信股份有限公司 | Method and device for controlling fan flow, computer equipment and readable storage medium |
| CN113464480B (en) * | 2021-08-13 | 2023-06-27 | 重庆金康赛力斯新能源汽车设计院有限公司 | Fan control method and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1916867A (en) * | 2005-08-19 | 2007-02-21 | 鸿富锦精密工业（深圳）有限公司 | Automatic method for controlling rotate speed of fan |
| CN104863881A (en) * | 2014-02-21 | 2015-08-26 | 中兴通讯股份有限公司 | Method and device for controlling fan rotating speed of electronic equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000135911A (en) * | 1998-10-30 | 2000-05-16 | Nissan Shatai Co Ltd | Fan motor controller |
| US6737824B1 (en) * | 2002-09-30 | 2004-05-18 | National Semiconductor Corporation | Fan acceleration control |
| JP6073613B2 (en) * | 2012-09-18 | 2017-02-01 | Ｎｅｃプラットフォームズ株式会社 | Electronic device and temperature control method for electronic device |
| CN103850963B (en) * | 2012-11-28 | 2016-06-29 | 鸿富锦精密工业（深圳）有限公司 | Fan control system and control method for fan |
| CN104214121A (en) * | 2013-05-31 | 2014-12-17 | 鸿富锦精密工业（深圳）有限公司 | Fan revolution control system and method |
| CN110617235B (en) * | 2019-08-22 | 2021-06-08 | 三维通信股份有限公司 | Method and device for controlling fan flow, computer equipment and readable storage medium |
-
2019
- 2019-08-22 CN CN201910778951.4A patent/CN110617235B/en active Active
-
2020
- 2020-08-13 WO PCT/CN2020/108892 patent/WO2021031971A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1916867A (en) * | 2005-08-19 | 2007-02-21 | 鸿富锦精密工业（深圳）有限公司 | Automatic method for controlling rotate speed of fan |
| CN104863881A (en) * | 2014-02-21 | 2015-08-26 | 中兴通讯股份有限公司 | Method and device for controlling fan rotating speed of electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110617235A (en) | 2019-12-27 |
| WO2021031971A1 (en) | 2021-02-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110617235B (en) | Method and device for controlling fan flow, computer equipment and readable storage medium | |
| CN108268082B (en) | Power control method and device | |
| CN113587338B (en) | Compressor exhaust temperature control method and device and air conditioner | |
| CN113530659B (en) | Fan control method and device, electronic equipment and medium | |
| CN108980985B (en) | Electric heater fault alarm method, electric heater fault alarm device, computer equipment and storage medium | |
| US9442025B2 (en) | System and method for calibrating temperatures sensor for integrated circuits | |
| CN114326989A (en) | Server cooling fan control method and device, server and storage medium | |
| CN110736130A (en) | room temperature deviation degree determination method, device and system | |
| CN109270508B (en) | Service life detection method of radar TR component power device | |
| CN113868052B (en) | IOPS (input/output) testing method and device based on PID (proportion integration differentiation) algorithm and storage medium | |
| CN112253516B (en) | Speed regulation method and device | |
| CN111324156B (en) | Passive device overheating protection method and device and power electronic equipment | |
| CN111083848B (en) | Overload protection method, device, equipment and medium for automobile LED lamp | |
| CN111578462B (en) | Compressor regulation method and device of air conditioning system, readable medium and electronic equipment | |
| CN114517936A (en) | Anti-blow-out control method and device, air conditioner and storage medium | |
| CN115653884B (en) | Method and device for controlling rotation speed of automobile compressor, computer equipment and storage medium | |
| CN112065703A (en) | Segmented control method and device for operating frequency of compressor | |
| CN113113645B (en) | Ambient temperature prediction method, ambient temperature prediction device, computer equipment and storage medium | |
| CN117747892B (en) | Fuel cell heating power control method, electronic equipment and electric equipment | |
| US20230393111A1 (en) | A System and a Method of Operating a Gas Sensor in a Portable Electronic Device | |
| CN117294299A (en) | Method, device, equipment and storage medium for adjusting operation parameters of semiconductor device | |
| CN116169554A (en) | Output power adjusting method, device, equipment and medium of fiber laser | |
| CN113835008A (en) | Power device tube core temperature estimation method and device | |
| CN117747892A (en) | Fuel cell heating power control method, electronic equipment and electric equipment | |
| CN114674447A (en) | Temperature compensation measuring method and device and computer equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |