A method and system for precise temperature control of high-speed air ducts

Abstract

This invention belongs to the field of high-speed air duct temperature control technology, and provides a method and system for precise temperature control of high-speed air ducts, including: S1: System initialization: setting the resistance, target power, and dropout period of the heating wire; S2: Detecting input voltage: detecting the input voltage of the heating wire, which is used to calculate the number of dropouts; S3: Calculating the number of dropouts: calculating the number of dropouts based on the dropout period, target power, resistance, and input voltage, and rounding the number of dropouts; S4: Correcting the dropout period: correcting the dropout period based on the number of dropouts before and after rounding, and rounding the corrected dropout period; S5: Setting temperature control parameters: using the rounded number of dropouts and dropout period as temperature control parameters to control the actual output power of the heating wire; S6: cyclically executing steps S2-S5, eliminating the need for an NTC on the heating frame, controlling the target temperature by calculating the power of the heating wire, reducing temperature fluctuations, and minimizing interference with the power grid.

Description

Technical Field

[0001] This invention belongs to the field of high-speed air duct temperature control technology, and particularly relates to a method and system for precise temperature control of high-speed air ducts. Background Technology

[0002] High-speed hair dryers typically refer to household appliances composed of heating wires, high-speed motors, and fan blades. They are mainly used for drying and styling hair, but can also be used in laboratories, physiotherapy rooms, industrial production, and art for localized drying, heating, and therapeutic purposes. Currently, the air temperature control technology used in high-speed hair dryers on the market is relatively simple, mostly employing wave-drop temperature control. This technology largely involves setting an NTC (Negative Temperature Coefficient) on the heating wire and then using the NTC to perform PID (Proportional) (Integral) (Differential) temperature control. Because the power fluctuation period of NTC temperature control is fixed, it is prone to large temperature fluctuations, resulting in inaccurate temperature testing and poor temperature control. NTCs are also susceptible to power grid interference, requiring high precision. If the NTC fails, the high-speed hair dryer will also be unable to work, presenting significant shortcomings in its use. Summary of the Invention

[0003] The purpose of this invention is to provide a method and system for precise temperature control of high-speed air ducts, aiming to solve the problems of large temperature fluctuations, poor temperature control effect, and susceptibility to power grid interference when using NTC temperature control technology for existing high-speed air ducts.

[0004] On the one hand, the present invention provides a method for precise temperature control of a high-speed air duct, comprising the following steps:

[0005] S1: System initialization: Set the resistance of the heating wire, target power, and dropout period;

[0006] S2: Input voltage detection: Detect the input voltage of the heating wire, which is used to calculate the number of dropped waves;

[0007] S3: Calculate the number of dropped waveforms: Calculate the number of dropped waveforms based on the dropped waveform period, target power, resistance, and input voltage, and round the number of dropped waveforms to the nearest integer.

[0008] S4: Correct the lost waveform period: Correct the lost waveform period according to the number of lost waveforms before and after rounding, and round the corrected lost waveform period.

[0009] S5: Set temperature control parameters: Use the rounded number of dropped waves and the dropped wave period as temperature control parameters to control the actual output power of the heating wire;

[0010] S6: Repeat steps S2-S5.

[0011] Preferably, step S3 includes the following steps:

[0012] S31: Calculate the maximum output power of the heating wire based on the resistance and input voltage;

[0013] S32: The number of dropped waves is calculated based on the dropped wave period, target power, and maximum output power;

[0014] S33: Round the number of dropped waves.

[0015] Preferably, step S32 includes the following steps:

[0016] S321: Set the maximum output power to Pmax, the target power to P, the period of loss before correction to T, and the number of losses before rounding to N, and calculate using the following formula (1):

[0017] N = TT * P / Pmax (1).

[0018] Preferably, step S33 includes the following steps:

[0019] S331: Set the number of dropped waves after rounding to Nm, and round N to get Nm.

[0020] Preferably, step S4 includes the following steps:

[0021] S41: Set the corrected loss period to Tn, and calculate it using the following formula (2):

[0022] Tn=Nm*T / N(2).

[0023] Preferably, step S4 further includes the following steps:

[0024] S42: Set the rounded period of the dropped wave to Tm, and round Tn to obtain Tm.

[0025] Preferably, the following steps are also included:

[0026] S7: Calculate the percentage of dropped waves based on the number of dropped waves and the dropped wave period before and after rounding, and analyze and judge the fluctuation of the actual output power based on the percentage of dropped waves error.

[0027] Preferably, step S1 further includes the following steps:

[0028] S11: Set the motor speed, which does not change with the actual output power.

[0029] On the other hand, the present invention also provides a high-speed air duct precision temperature control system, wherein the system adopts the high-speed air duct precision temperature control method described in any of the above claims.

[0030] The beneficial effects of this invention are as follows: Unlike existing technologies, the high-speed air duct precise temperature control method of this invention includes: S1: System initialization: setting the resistance, target power, and dropout period of the heating wire; S2: Detecting input voltage: detecting the input voltage of the heating wire, which is used to calculate the number of dropouts; S3: Calculating the number of dropouts: calculating the number of dropouts based on the dropout period, target power, resistance, and input voltage, and rounding the number of dropouts; S4: Correcting the dropout period: correcting the dropout period based on the number of dropouts before and after rounding, and rounding the corrected dropout period; S5: Setting temperature control parameters: using the rounded number of dropouts and the dropout period as temperature control parameters to control the actual output power of the heating wire; S6: Continuing steps S2-S5 in a loop; It eliminates the need for an NTC on the heating frame, indirectly controlling the target temperature by calculating the power of the heating wire, and fine-tuning the dropout period to minimize power fluctuations, thereby reducing temperature fluctuations and interference with the power grid. Attached Figure Description

[0031] Figure 1 This is a schematic diagram illustrating the application scenario of the high-speed air duct precise temperature control method in Embodiment 1 of the present invention;

[0032] Figure 2 This is a flowchart illustrating the implementation of the high-speed air duct precise temperature control method in Embodiment 1 of the present invention. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0034] The specific implementation of the present invention will be described in detail below with reference to specific embodiments:

[0035] Example 1:

[0036] Figure 1In the application scenario of the high-speed air duct precise temperature control method provided in Embodiment 1 of the present invention, the high-speed air duct 100 is at a specified distance from the air temperature test point 200, and the temperature of the air temperature test point 200 is set as the target temperature. A heating wire is provided inside the high-speed air duct 100. The actual heating power of the heating wire is controlled by controlling the number of dropped waves and the dropped wave period, thereby controlling the air blown out of the high-speed air duct 100 to be consistent with the target temperature when it reaches the air temperature test point 200, and thus controlling the air temperature blown out of the high-speed air duct 100 to always remain at a stable level, so as to achieve a better user experience. It is understood that the "specified distance" is usually preset or selected according to the needs of testing or actual application. This embodiment is only an example.

[0037] Figure 2 The flowchart illustrating the implementation of the high-speed air duct precise temperature control method provided in this embodiment of the invention is shown. For ease of explanation, only the parts related to this embodiment are shown, specifically including the following steps:

[0038] S1: System initialization: Set the resistance of the heating wire, target power, and dropout period;

[0039] In this embodiment, the resistance and target power of the heating wire are both constant values. The target power refers to the power that the heating wire needs to output in order to reach the target temperature. The loss period in this process is the loss period before correction, which needs to be corrected and rounded.

[0040] Furthermore, step S1 also includes the following steps:

[0041] S11: Set the motor speed. The motor speed will not change with the actual output power, which helps to eliminate the interference of motor speed on the temperature control results.

[0042] S2: Input voltage detection: Detects the input voltage of the heating wire. The input voltage is used to calculate the number of dropped waveforms.

[0043] In this embodiment, the input voltage of the heating wire is a variable value, and the maximum output power of the heating wire varies with the input voltage.

[0044] S3: Calculate the number of dropped waveforms: Calculate the number of dropped waveforms based on the dropped waveform period, target power, resistance, and input voltage, and round the number of dropped waveforms to the nearest integer.

[0045] In this embodiment, step S3 specifically includes the following steps:

[0046] S31: Calculate the maximum output power of the heating wire based on the resistance and input voltage;

[0047] In step S31, the resistance and input voltage are substituted into the conventional power calculation formula to obtain the calculation result. For example, let the resistance of the heating wire be R, the input voltage be U, and the maximum output power be Pmax. Substitute the resistance R and the input voltage U into Pmax = U 2 / R, the maximum output power Pmax of the heating wire is calculated.

[0048] S32: The number of dropped signals is calculated based on the loss period, target power, and maximum output power;

[0049] In this embodiment, step S32 specifically includes the following steps:

[0050] S321: Set the maximum output power to Pmax, the target power to P, the period of loss before correction to T, and the number of losses before rounding to N, and calculate using the following formula (1):

[0051] N = TT * P / Pmax (1);

[0052] S33: Round the number of lost waves;

[0053] In this embodiment, step S33 specifically includes the following steps:

[0054] S331: Set the number of dropped waves after rounding to Nm, and round N to get Nm;

[0055] S4: Correct the lost waveform period: Correct the lost waveform period based on the number of lost waveforms before and after rounding, and then round the corrected lost waveform period.

[0056] In this embodiment, step S4 specifically includes the following steps:

[0057] S41: Set the corrected loss period to Tn, and calculate it using the following formula (2):

[0058] Tn=Nm*T / N(2);

[0059] In this embodiment, step S4 further includes the following steps:

[0060] S42: Set the rounded period of the dropped wave to Tm, and round Tn to get Tm;

[0061] S5: Set temperature control parameters: Use the rounded number of dropped waves and the dropped wave period as temperature control parameters to control the actual output power of the heating wire;

[0062] In step S5, the rounded Nm and Tm are used as temperature control parameters to control the actual heating power of the heating wire, thereby achieving the regulation of the target temperature at the wind temperature test point. Compared with NTC temperature control, this invention controls temperature fluctuations by controlling the power of the heating wire. The power fluctuation is small, which reduces temperature fluctuations and makes the test results more accurate. At the same time, it can also reduce interference to the power grid.

[0063] S6: Repeat steps S2-S5;

[0064] In this embodiment, steps S2-S5 can be executed multiple times as needed;

[0065] In order to analyze and determine the degree of power fluctuation, this embodiment of the method further includes step S7:

[0066] S7: Calculate the percentage of dropped waveforms based on the number of dropped waveforms and the dropped waveform period before and after rounding, and analyze and judge the degree of fluctuation of the actual output power based on the percentage of dropped waveform errors.

[0067] In step S7, the percentage of lost waveform error is set as δ, and calculated using the following formula (3):

[0068] δ=Nm / Tm-N / T;

[0069] Example of Embodiment 1 of the present invention is shown in Table 1. Table 1 records two sets of comparative test data, namely the control group and the test group. In the control group, the loss period was not corrected or rounded. For easy distinction, the corresponding parameters in the two groups are represented by N1 and T1, and N2 and T2, respectively. Please refer to Table 1 below for specific test data:

[0070]

[0071] Table 1

[0072] As can be seen from Table 1 above, the error percentage measured by the method in Embodiment 1 of the present invention is lower. Therefore, the temperature control results achieved by measuring the number of dropped waves and the dropped wave period by the method in Embodiment 1 of the present invention are more accurate. The target temperature is indirectly controlled by calculating the power of the heating wire. At the same time, the power fluctuation is reduced by calculating and fine-tuning the dropped wave period, thereby reducing temperature fluctuation and interference to the power grid.

[0073] In other embodiments, the present invention also provides a high-speed air duct precision temperature control system, which adopts the high-speed air duct precision temperature control method in Embodiment 1.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for precise temperature control of a high-speed air duct, characterized in that, Includes the following steps: S1: System initialization: Set the resistance of the heating wire, target power, and dropout period; S2: Input voltage detection: Detect the input voltage of the heating wire, which is used to calculate the number of dropped waves; S3: Calculate the number of dropped waveforms: Calculate the number of dropped waveforms based on the dropped waveform period, target power, resistance and input voltage, and round the number of dropped waveforms to an integer. S4: Correct the dropped period: Correct the dropped period according to the number of dropped waves before and after rounding to an integer, and round the corrected dropped period to an integer. S5: Set temperature control parameters: Use the number of dropped waves and the dropped wave period, rounded to integers, as temperature control parameters to control the actual output power of the heating wire; S6: Repeat steps S2-S5; Step S3 includes the following steps: S31: Calculate the maximum output power of the heating wire based on the resistance and input voltage; S32: The number of dropped waves is calculated based on the dropped wave period, target power, and maximum output power; S33: Round the number of dropped waves to an integer; Step S32 includes the following steps: S321: Set the maximum output power to Pmax, the target power to P, the period of dropped waves before correction to T, and the number of dropped waves before rounding to an integer to N, and calculate using the following formula (1): N = TT * P / Pmax (1); Step S33 includes the following steps: S331: Set the number of dropped waves after rounding to an integer as Nm, and round N to get Nm; Step S4 includes the following steps: S41: Set the corrected loss period to Tn, and calculate it using the following formula (2): Tn=Nm*T / N(2; Step S4 also includes the following steps: S42: Set the discarded period after rounding to an integer as Tm, and round Tn to obtain Tm.

2. The high-speed air duct precise temperature control method as described in claim 1, characterized in that, It also includes the following steps: S7: Calculate the percentage of dropped waves based on the number of dropped waves and the dropped wave period before and after rounding to an integer, and analyze and judge the degree of fluctuation of the actual output power based on the percentage of dropped waves error.

3. The high-speed air duct precise temperature control method according to any one of claims 1-2, characterized in that, Step S1 further includes the following steps: S11: Set the motor speed, which does not change with the actual output power.

4. A high-speed air duct precision temperature control system, characterized in that, The system employs the high-speed air duct precise temperature control method as described in any one of claims 1-3.

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