CN118695431B - Driving current calibration method and device for LED driving power supply - Google Patents
Driving current calibration method and device for LED driving power supply Download PDFInfo
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- CN118695431B CN118695431B CN202411171215.XA CN202411171215A CN118695431B CN 118695431 B CN118695431 B CN 118695431B CN 202411171215 A CN202411171215 A CN 202411171215A CN 118695431 B CN118695431 B CN 118695431B
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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Abstract
本发明涉及LED驱动电源技术领域，特别是一种LED驱动电源的驱动电流校准方法及其装置，包括：LED驱动电源与驱动电流校准装置电连接后，向校准装置导入校准文件进行信息匹配；成功后，校准装置向驱动电源多次发送不同的驱动电流生成指令并在接收驱动电流反馈，以此计算出调光等级方程；然后选定目标驱动电流值，利用方程得出目标调光等级；校准装置根据等级调节值调整向驱动电源发送的目标调光等级并接收实际驱动电流值反馈，直至实际与目标驱动电流值的差值≤预设误差值后，驱动电源将此时实际驱动电流设为对应档位的驱动电流值，生成新的调光曲线；从而解决不同类型的LED驱动电源输出的驱动电流不准确问题，并实现快速校准。
The present invention relates to the technical field of LED driving power supplies, in particular to a driving current calibration method and device of an LED driving power supply, comprising: after the LED driving power supply is electrically connected to a driving current calibration device, a calibration file is imported into the calibration device for information matching; after success, the calibration device sends different driving current generation instructions to the driving power supply for multiple times and receives driving current feedback, thereby calculating a dimming level equation; then a target driving current value is selected, and a target dimming level is obtained by using the equation; the calibration device adjusts the target dimming level sent to the driving power supply according to the level adjustment value and receives actual driving current value feedback, until the difference between the actual and target driving current values is ≤ a preset error value, the driving power supply sets the actual driving current at this time to the driving current value of the corresponding gear, and generates a new dimming curve; thereby solving the problem of inaccurate driving current output by different types of LED driving power supplies, and realizing fast calibration.
Description
Technical Field
The invention relates to the technical field of LED driving power supplies, in particular to a driving current calibration method and a device thereof of an LED driving power supply.
Background
The luminous efficiency of an LED is closely related to the stability of its driving current. The driving current calibration can ensure that the LED operates under the optimal working current, so that the luminous efficiency of the LED is maximized, the light attenuation is reduced, and the service life is prolonged. Meanwhile, the stable driving current can also reduce the flickering phenomenon of the LED in the working process, and the illumination stability is improved. Therefore, the driving current of the LED driving power supply is calibrated, the LED can be ensured to stably run under the optimal working current, the luminous efficiency is maximized, the light attenuation is reduced, the service life is prolonged, the energy consumption is reduced, and the LED driving power supply is a key link in the design of the LED driving power supply and has important significance for improving the overall performance and the market competitiveness of LED lighting products.
At present, related parameters of the LED driving power supply are set by an upper computer to be directly loaded, and the driving current of the LED driving power supply is generally considered to have no error or within an allowable range, so that the driving current of the LED driving power supply is not required to be calibrated by default, and the related parameters (such as a dimming curve) cannot be adapted to all types of LED driving power supplies, and the driving current output by the LED driving power supply is not necessarily accurate due to different hardware environments.
Therefore, if the driving current of the LED driving power supply is to be calibrated, the driving current of each gear needs to be calibrated, the number of calibration steps is large, the calibration time is too long, and the working efficiency, the production efficiency or the development progress are reduced.
Disclosure of Invention
Aiming at the defects, the invention aims to provide a driving current calibration method and a device thereof for an LED driving power supply, which solve the problem of inaccurate driving current output by different types of LED driving power supplies and realize quick calibration.
To achieve the purpose, the invention adopts the following technical scheme:
a driving current calibration method of an LED driving power supply comprises the following steps:
a1, an LED driving power supply is electrically connected with a driving current calibration device;
a2, importing a calibration file into the driving current calibration device, executing the step A3 after the identification information of the calibration file is successfully matched with the LED driving power supply information, and ending the cycle if not;
A3, the driving current calibration device sends different driving current generation instructions to the LED driving power supply for a plurality of times, receives the generated driving current values from the LED driving power supply after each sending, forms a plurality of current coordinates, and calculates a dimming level equation;
a4, selecting a target driving current value according to the calibration file, and obtaining a target dimming level by using a dimming level equation;
A5, the driving current calibration device adjusts a target dimming level sent to the LED driving power supply according to the level adjustment value of the calibration file, and receives the generated actual driving current value from the LED driving power supply until the difference value between the actual driving current value and the target driving current value is smaller than or equal to the preset error value of the calibration file;
and A6, setting the actual driving current as a driving current value of a gear corresponding to the target driving current value by the LED driving power supply, and generating a new dimming curve by combining the maximum gear driving current value.
Further, the step A3 includes the following substeps:
A31, the driving current calibration device sends a maximum driving current generation instruction to the LED driving power supply, receives the generated maximum driving current value from the LED driving power supply after the maximum driving current generation instruction is sent, and forms a first current coordinate (DIMMERLEVE 1, current 1) according to the dimming level and the driving current value of the driving current at the moment, wherein DIMMERLEVE1 represents the dimming level of the maximum driving current, and current1 represents the maximum driving current value;
A32, the driving current calibration device sends a generating instruction of half maximum driving current to the LED driving power supply, receives the generated half maximum driving current value from the LED driving power supply after the transmitting is finished, and forms a second current coordinate (DIMMERLEVE & lt 2 & gt, current 2) according to the dimming level and the driving current value of the driving current at the moment, wherein DIMMERLEVE & lt 2 & gt represents the dimming level of the half maximum driving current, and current2 represents the half maximum driving current value;
A33, substituting the first current coordinate (DIMMERLEVE, current 1) and the second current coordinate (DIMMERLEVE, current 2) into a dimming curve equation corresponding to the LED driving power supply respectively, and calculating a dimming level equation.
Further, the step A5 includes the following substeps:
A51, the driving current calibration device sends a target dimming level to the LED driving power supply and receives the generated actual driving current value from the LED driving power supply;
a52, judging whether the difference value between the actual driving current value and the target driving current value is smaller than or equal to the preset error value of the calibration file, if so, executing the step A6, otherwise, executing the step A53;
a53, adjusting the target dimming level according to the level adjustment value of the calibration file, and then executing step A51.
Further, the step A6 includes the following substeps:
a61, the driving current calibration device sends a storage instruction to the LED driving power supply, and the LED driving power supply stores the actual driving current value at the moment as a calibration gear driving current value of a gear corresponding to the target driving current value;
a62, after the LED driving power supply is powered on again, carrying out positive compensation or negative compensation on the theoretical gear driving current value according to the difference value between the calibration gear driving current value and the theoretical gear driving current value of the gear, so as to obtain a compensated theoretical gear driving current value;
and A63, generating a new dimming curve by the LED driving power supply according to the compensated theoretical gear driving current value and the maximum gear driving current value.
Further, in the step A4, the target driving current value selected according to the calibration file is the target minimum gear driving current value.
Further, in the step A5, the preset error value of the calibration file is a current value corresponding to the duty ratio of the dimming steps between the two dimming levels.
Further, in the substep a33, the dimming curve equation isWherein DIMMERLEVE is the dimming level of the driving current, current is the driving current value, and k and b are equation coefficients.
Further, the sub-step A53 includes subtracting a level adjustment value from the target dimming level if the actual driving current value is greater than the target driving current value, adding a level adjustment value to the target dimming level if the actual driving current value is less than the target driving current value, and then executing the step A51.
Further, the step A1 comprises the step of electrically connecting the communication end of the driving current calibration device with the communication end of the LED driving power supply, and the step of electrically connecting the input end of the driving current device with the output end of the LED driving power supply.
The driving current calibration device comprises a communication unit, a controller unit, a digital-to-analog conversion unit, an operation unit and a display unit, wherein the communication end of the communication unit is used as the communication end of the driving current calibration device, and the input end of the digital-to-analog conversion unit is used as the input end of the driving current calibration device;
The output end of the digital-to-analog conversion unit is electrically connected with the first input end of the controller unit, the first output end of the controller unit is electrically connected with the input end of the communication unit, the second input end of the controller unit is electrically connected with the output end of the operation unit, and the second output end of the controller unit is electrically connected with the input end of the display unit.
The technical scheme provided by the invention has the beneficial effects that the driving current calibration device reflects the real dimming performance of the LED driving power supply by fitting a dimming equation, then the dimming equation extracts the target driving current value of the gear to be calibrated, compares the difference value between the target and the actual, adjusts the target dimming level by the level adjustment value of the calibration file, so that the actual driving current value of the gear approaches to the target driving current value, thereby completing the calibration of the actual driving current value of the gear, the LED driving power supply sets the calibrated actual driving current as the driving current value of the gear corresponding to the target driving current value, and combines the maximum gear driving current value, so that the LED driving power supply can be suitable for different types of LED driving power supplies, realizes the dimming curve update of the LED driving power supply, further completes the calibration of the driving current values of all gears, does not need to calibrate one gear by one, has short calibration time, and effectively improves the working efficiency, the production efficiency or the development progress and the like.
Drawings
Fig. 1 is a flow chart of a method for calibrating a driving current of an LED driving power supply according to one embodiment of the present invention.
Fig. 2 is a schematic diagram of a drive current calibration device according to one embodiment of the present invention.
The device comprises a communication unit 1, a controller unit 2, a digital-to-analog conversion unit 3, an operation unit 4 and a display unit 5.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of embodiments of the present invention, the terms "first," "second," and the like 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 defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless explicitly defined otherwise.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "coupled" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, directly connected, indirectly connected through an intermediary, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific circumstances.
Next, a driving current calibration method and apparatus for an LED driving power supply according to an embodiment of the present invention will be described with reference to fig. 1 to 2.
A driving current calibration method of an LED driving power supply comprises the following steps:
a1, an LED driving power supply is electrically connected with a driving current calibration device;
a2, importing a calibration file into the driving current calibration device, executing the step A3 after the identification information of the calibration file is successfully matched with the LED driving power supply information, and ending the cycle if not;
A3, the driving current calibration device sends different driving current generation instructions to the LED driving power supply for a plurality of times, receives the generated driving current values from the LED driving power supply after each sending, forms a plurality of current coordinates, and calculates a dimming level equation;
a4, selecting a target driving current value according to the calibration file, and obtaining a target dimming level by using a dimming level equation;
A5, the driving current calibration device adjusts a target dimming level sent to the LED driving power supply according to the level adjustment value of the calibration file, and receives the generated actual driving current value from the LED driving power supply until the difference value between the actual driving current value and the target driving current value is smaller than or equal to the preset error value of the calibration file;
and A6, setting the actual driving current as a driving current value of a gear corresponding to the target driving current value by the LED driving power supply, and generating a new dimming curve by combining the maximum gear driving current value.
In the preferred embodiment of the driving current calibration method of the LED driving power supply, as shown in fig. 1, first, after the LED driving power supply is electrically connected with the driving current calibration device, a calibration file is imported into the driving current calibration device, and information matching is performed with the LED driving power supply by using identification information (such as the model number and the material label of the LED driving power supply) of the calibration file, so as to avoid error of a calibration object.
Then, different driving current generating instructions are sent to the LED driving power supply for a plurality of times through the driving current calibrating device, and the generated driving current values are received from the LED driving power supply after each sending is finished, which is equivalent to sending different dimming grades, so that the actual driving current values generated by the LED driving power supply at the different dimming grades are obtained, a plurality of current coordinates are formed, and a dimming grade equation is calculated, and the dimming grade equation can truly reflect the dimming performance (or dimming curve) of the LED driving power supply.
Based on the above, the inaccurate dimming curve of the burnt LED driving power supply can be calibrated by using the dimming level equation. According to the target driving current value (namely, the driving current value representing the brightness which is expected to be obtained by the gear and can be any gear) which is selected by the calibration file and is to be calibrated, substituting a dimming level equation to obtain a corresponding target dimming level, and sending the corresponding target dimming level to an LED driving power supply to obtain a real driving current value, so as to judge the difference between the target and the real bottom, and reducing the difference between the target and the real bottom by adjusting the target dimming level until the difference is within an error range (namely, the difference is smaller than or equal to a preset error value of the calibration file).
And finally, setting the calibrated actual driving current as a driving current value of a gear corresponding to the target driving current value, combining the maximum gear driving current value (because the maximum driving current value is unchanged and does not need to be calibrated), and generating a new dimming curve by utilizing the two-point current value and the corresponding duty ratio of the two-point current value.
In summary, the driving current calibration device reflects the real dimming performance of the LED driving power supply by fitting the dimming equation, then extracts the target driving current value of the gear to be calibrated by the dimming equation, compares the difference between the target and the actual, adjusts the target dimming level by the level adjustment value of the calibration file, so that the actual driving current value approaches to the target driving current value, thereby completing the calibration of the actual driving current value of the gear, the LED driving power supply sets the calibrated actual driving current value as the driving current value of the gear corresponding to the target driving current value, combines with the maximum gear driving current value, and can be suitable for different types of LED driving power supplies, thereby realizing the dimming curve update of the LED driving power supply, further completing the calibration of the driving current values of all gears, without calibrating one gear by one, having short calibration time, effectively improving the working efficiency, the production efficiency or the development progress, and the like.
Further, step A3 comprises the sub-steps of:
A31, the driving current calibration device sends a maximum driving current generation instruction to the LED driving power supply, receives the generated maximum driving current value from the LED driving power supply after the maximum driving current generation instruction is sent, and forms a first current coordinate (DIMMERLEVE 1, current 1) according to the dimming level and the driving current value of the driving current at the moment, wherein DIMMERLEVE1 represents the dimming level of the maximum driving current, and current1 represents the maximum driving current value;
A32, the driving current calibration device sends a generating instruction of half maximum driving current to the LED driving power supply, receives the generated half maximum driving current value from the LED driving power supply after the transmitting is finished, and forms a second current coordinate (DIMMERLEVE & lt 2 & gt, current 2) according to the dimming level and the driving current value of the driving current at the moment, wherein DIMMERLEVE & lt 2 & gt represents the dimming level of the half maximum driving current, and current2 represents the half maximum driving current value;
A33, substituting the first current coordinate (DIMMERLEVE, current 1) and the second current coordinate (DIMMERLEVE, current 2) into a dimming curve equation corresponding to the LED driving power supply respectively, and calculating a dimming level equation.
In this embodiment, based on the fact that the dimming curves generally adopted by the current LED driving power supply are a linear dimming curve and a logarithmic dimming curve, the corresponding linear equation and logarithmic equation can be respectively utilized, and the dimming curve equation corresponding to the dimming curve, namely, the dimming level equation, can be confirmed by utilizing two current coordinates, so that the dimming level equation is preferably determined by adopting two current coordinates, and the calibration time is greatly shortened.
And because the maximum driving current and the half maximum driving current have higher certainty compared with other driving currents, the dimming level is easier to correspond to the driving current, so that the maximum driving current and the half maximum driving current are selected as the most accurate dimming level equation for confirming the two current coordinates.
Further, step A5 comprises the sub-steps of:
A51, the driving current calibration device sends a target dimming level to the LED driving power supply and receives the generated actual driving current value from the LED driving power supply;
a52, judging whether the difference value between the actual driving current value and the target driving current value is smaller than or equal to the preset error value of the calibration file, if so, executing the step A6, otherwise, executing the step A53;
a53, adjusting the target dimming level according to the level adjustment value of the calibration file, and then executing step A51.
In this embodiment, since only the actual driving current value of one gear is required to be calibrated, the actual driving current value of the gear will have a significant influence on the calibration effect of the final LED driving power source, so the adjustment process for making the actual driving current value approach to the target driving current value preferably adopts a loop verification manner, so as to improve the final accuracy of the actual driving current value.
Further, step A6 comprises the sub-steps of:
a61, the driving current calibration device sends a storage instruction to the LED driving power supply, and the LED driving power supply stores the actual driving current value at the moment as a calibration gear driving current value of a gear corresponding to the target driving current value;
a62, after the LED driving power supply is powered on again, carrying out positive compensation or negative compensation on the theoretical gear driving current value according to the difference value between the calibration gear driving current value and the theoretical gear driving current value of the gear, so as to obtain a compensated theoretical gear driving current value;
and A63, generating a new dimming curve by the LED driving power supply according to the compensated theoretical gear driving current value and the maximum gear driving current value.
In this embodiment, the LED driving power supply has the relevant dimming data burnt therein, so that the actual driving current value (calibration gear driving current value) after calibration is saved to the LED driving power supply, and after the LED driving power supply is powered on again, the theoretical gear driving current value is positively compensated or negatively compensated according to the difference value between the calibration gear driving current value and the theoretical gear driving current of the gear, so that the theoretical gear driving current value is equal to the calibration gear driving current value, and the maximum gear driving current value is combined to generate a new dimming curve, thereby realizing calibration.
In step A4, the target driving current value selected according to the calibration file is the target minimum gear driving current value.
In this embodiment, the minimum gear driving current value is selected to be calibrated relative to other driving current values, so that in step A6, the LED driving power source is easier to obtain the duty ratios of all the remaining gear driving currents according to the duty ratios of the maximum and minimum driving current values, because the duty ratios of all the remaining gear driving currents are between the two, the new dimming curve is closer to the target dimming curve.
Further, in step A5, the preset error value of the calibration file is a current value corresponding to the duty cycle of the dimming step between two dimming levels.
In this embodiment, when the difference between the target driving current value and the actual driving current value is greater than the current value corresponding to the dimming step duty ratio between the two dimming levels, the brightness difference of the LED lamp will be more obvious, and in order to maintain the consistency and smoothness of dimming of the LED lamp, the current value corresponding to the dimming step duty ratio between the two dimming levels is preferably used as the preset error value, as the standard for whether to complete calibration.
Further, in sub-step A33, the dimming curve equation isWherein DIMMERLEVE is the dimming level of the driving current, current is the driving current value, and k and b are equation coefficients.
In this embodiment, the LED driving power supply calibration effect using the linear dimming curve is better than that of the logarithmic dimming curve, so the dimming curve is preferablyThe factors of the first current coordinate (DIMMERLEVE 1, current 1) and the second current coordinate (DIMMERLEVE, current 2) are respectively substituted into the formula correspondingly to obtain an equation set, the values of k and b are solved and substituted into the original formula, and a dimming curve equation reflecting the dimming performance of the LED driving power supply can be obtained.
Further, the sub-step A53 includes subtracting a level adjustment value from the target dimming level if the actual driving current value is greater than the target driving current value, adding a level adjustment value to the target dimming level if the actual driving current value is less than the target driving current value, and then executing the step A51.
In this embodiment, the final accuracy of the actual driving current value is improved by the loop verification method, and the adjustment is preferably performed by a multiple reduction and increase method in order to avoid the actual driving current value from floating back and forth around the target driving current value and affecting the calibration efficiency. More importantly, in order to reduce the number of cycles between the sub-steps a51 to a53, the level adjustment value needs to summarize the general error range according to different LED driving power types, and a proper level adjustment value is selected to strive for completing the calibration of the actual driving current value in as few cycles as possible, thereby improving the calibration efficiency, while the level adjustment value is preferably in the range of 0.5-2 according to the current actual calibration condition, and the target dimming level can be quickly calibrated by increasing or decreasing 0.5-2 dimming levels. It should be noted that, when the difference between the target driving current value and the actual driving current value is greater than the preset error value (i.e., the current value corresponding to the duty ratio of the dimming step between the two dimming levels), the preset error value is not affected as a criterion for determining whether to complete the calibration.
Further, the step A1 comprises the step of electrically connecting the communication end of the driving current calibration device with the communication end of the LED driving power supply, and the step of electrically connecting the input end of the driving current device with the output end of the LED driving power supply.
In this embodiment, when the driving current calibration device is to calibrate the LED driving power supply, the driving current calibration device is to interact with the LED driving power supply data and receive the actual driving current value from the LED driving power supply, so that the communication end of the driving current calibration device is to be electrically connected to the communication end of the LED driving power supply, and the input end of the driving current device is to be electrically connected to the output end of the LED driving power supply, thereby completing the electrical connection relationship between the driving current calibration device and the LED driving power supply.
The driving current calibration device comprises a communication unit 1, a controller unit 2, a digital-to-analog conversion unit 3, an operation unit 4 and a display unit 5, wherein the communication end of the communication unit 1 is used as the communication end of the driving current calibration device, and the input end of the digital-to-analog conversion unit 3 is used as the input end of the driving current calibration device;
The output end of the digital-to-analog conversion unit 3 is electrically connected with the first input end of the controller unit 2, the first output end of the controller unit 2 is electrically connected with the input end of the communication unit 1, the second input end of the controller unit 2 is electrically connected with the output end of the operation unit 4, and the second output end of the controller unit 2 is electrically connected with the input end of the display unit 5.
In this embodiment, a preferred embodiment of the driving current calibration device is also provided, as shown in fig. 2, where the communication unit 1 (such as serial communication), the controller unit 2 (such as MCU) and the digital-to-analog conversion unit 3 combine all the steps of the driving current calibration method for an LED driving power supply, and at the same time, the operation unit 4 (such as a button) can be used to control the start and stop of the driving current calibration device, and the display unit 5 (such as an LCD screen display) can be used to view calibration data, procedures, curves, and the like.
Other configurations and operations of a driving current calibration method of an LED driving power source and an apparatus thereof according to an embodiment of the present invention are known to those skilled in the art, and will not be described in detail herein.
In the description herein, reference to the term "embodiment," "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (8)
1. A driving current calibration method of an LED driving power supply is characterized by comprising the following steps:
a1, an LED driving power supply is electrically connected with a driving current calibration device;
a2, importing a calibration file into the driving current calibration device, executing the step A3 after the identification information of the calibration file is successfully matched with the LED driving power supply information, and ending the cycle if not;
A3, the driving current calibration device sends different driving current generation instructions to the LED driving power supply for a plurality of times, receives the generated driving current values from the LED driving power supply after each sending, forms a plurality of current coordinates, and calculates a dimming level equation;
a4, selecting a target driving current value according to the calibration file, and obtaining a target dimming level by using a dimming level equation;
A5, the driving current calibration device adjusts a target dimming level sent to the LED driving power supply according to the level adjustment value of the calibration file, and receives the generated actual driving current value from the LED driving power supply until the difference value between the actual driving current value and the target driving current value is smaller than or equal to the preset error value of the calibration file;
A6, the LED driving power supply sets the actual driving current at the moment as a driving current value of a gear corresponding to the target driving current value, and generates a new dimming curve by combining the maximum gear driving current value;
said step A3 comprises the sub-steps of:
A31, the driving current calibration device sends a maximum driving current generation instruction to the LED driving power supply, receives the generated maximum driving current value from the LED driving power supply after the maximum driving current generation instruction is sent, and forms a first current coordinate (DIMMERLEVE 1, current 1) according to the dimming level and the driving current value of the driving current at the moment, wherein DIMMERLEVE1 represents the dimming level of the maximum driving current, and current1 represents the maximum driving current value;
A32, the driving current calibration device sends a generating instruction of half maximum driving current to the LED driving power supply, receives the generated half maximum driving current value from the LED driving power supply after the transmitting is finished, and forms a second current coordinate (DIMMERLEVE & lt 2 & gt, current 2) according to the dimming level and the driving current value of the driving current at the moment, wherein DIMMERLEVE & lt 2 & gt represents the dimming level of the half maximum driving current, and current2 represents the half maximum driving current value;
A33, substituting the first current coordinate (DIMMERLEVE, current 1) and the second current coordinate (DIMMERLEVE, current 2) into a dimming curve equation corresponding to the LED driving power supply respectively, and calculating a dimming level equation;
In the step A4, the target driving current value selected according to the calibration file is the target minimum gear driving current value.
2. The method for calibrating a driving current of an LED driving power supply according to claim 1, wherein said step A5 comprises the substeps of:
A51, the driving current calibration device sends a target dimming level to the LED driving power supply and receives the generated actual driving current value from the LED driving power supply;
a52, judging whether the difference value between the actual driving current value and the target driving current value is smaller than or equal to the preset error value of the calibration file, if so, executing the step A6, otherwise, executing the step A53;
a53, adjusting the target dimming level according to the level adjustment value of the calibration file, and then executing step A51.
3. The method for calibrating a driving current of an LED driving power supply according to claim 1, wherein said step A6 comprises the substeps of:
a61, the driving current calibration device sends a storage instruction to the LED driving power supply, and the LED driving power supply stores the actual driving current value at the moment as a calibration gear driving current value of a gear corresponding to the target driving current value;
a62, after the LED driving power supply is powered on again, carrying out positive compensation or negative compensation on the theoretical gear driving current value according to the difference value between the calibration gear driving current value and the theoretical gear driving current value of the gear, so as to obtain a compensated theoretical gear driving current value;
and A63, generating a new dimming curve by the LED driving power supply according to the compensated theoretical gear driving current value and the maximum gear driving current value.
4. The method for calibrating driving current of LED driving power supply according to claim 1, wherein in the step A5, the preset error value of the calibration file is a current value corresponding to a duty cycle of a dimming step between two dimming levels.
5. The method of claim 1, wherein in the step A33, the dimming curve equation is current=k× DIMMERLEVE +b, wherein DIMMERLEVE is the dimming level of the driving current, current is the driving current value, and k and b are equation coefficients.
6. A driving current calibration method for an LED driving power supply according to claim 2, wherein the sub-step A53 comprises subtracting a level adjustment value from the target dimming level if the actual driving current value is greater than the target driving current value, adding a level adjustment value to the target dimming level if the actual driving current value is less than the target driving current value, and then performing the step A51.
7. The method of claim 1, wherein the step A1 includes the step of electrically connecting the communication terminal of the driving current calibration device to the communication terminal of the LED driving power supply, and the step of electrically connecting the input terminal of the driving current device to the output terminal of the LED driving power supply.
8. A driving current calibration device is characterized by comprising a communication unit, a controller unit, a digital-to-analog conversion unit, an operation unit and a display unit, wherein the communication end of the communication unit is used as the communication end of the driving current calibration device, and the input end of the digital-to-analog conversion unit is used as the input end of the driving current calibration device;
The output end of the digital-to-analog conversion unit is electrically connected with the first input end of the controller unit, the first output end of the controller unit is electrically connected with the input end of the communication unit, the second input end of the controller unit is electrically connected with the output end of the operation unit, and the second output end of the controller unit is electrically connected with the input end of the display unit.
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