CN118695431A - A driving current calibration method and device for LED driving power supply - Google Patents

Abstract

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

A driving current calibration method and device for LED driving power supply

Technical Field

The present invention relates to the technical field of LED driving power supply, and in particular to a driving current calibration method and device of an LED driving power supply.

Background Art

The luminous efficiency of LED is closely related to the stability of its driving current. Driving current calibration can ensure that the LED operates at the optimal operating current, thereby maximizing its luminous efficiency, reducing light decay, and extending its service life. At the same time, a stable driving current can also reduce the flickering of the LED during operation and improve lighting stability. Therefore, calibrating the driving current of the LED driver power supply can ensure that the LED operates stably at the optimal operating current, maximize luminous efficiency, reduce light decay, extend service life, and reduce energy consumption. It is a key link in the design of LED driver power supplies and is of great significance to improving the overall performance and market competitiveness of LED lighting products.

At present, the relevant parameters of the LED driver power supply are set by the host computer and loaded directly. It is generally believed that there is no error in the driving current of the LED driver power supply, or the error is within the allowable range, so it is assumed that there is no need to calibrate the driving current of the LED driver power supply; this leads to the fact that the relevant parameters (such as dimming curve) cannot be adapted to all types of LED driver power supplies. Due to different hardware environments, the driving current output by the LED driver power supply is not necessarily accurate.

Therefore, if you want to calibrate the driving current of the LED driving power supply, you need to calibrate the driving current of each gear. There are many calibration steps and the calibration time is too long, which reduces work efficiency, production efficiency or R&D progress.

Summary of the invention

In view of the above-mentioned defects, the purpose of the present invention is to propose a driving current calibration method and device for an LED driving power supply, so as to solve the problem of inaccurate driving current output by different types of LED driving power supplies and realize rapid calibration.

To achieve this object, the present invention adopts the following technical solutions:

A method for calibrating a driving current of an LED driving power supply comprises the following steps:

A1: The LED driving power supply is electrically connected to the driving current calibration device;

A2: Import the calibration file into the drive current calibration device. When the identification information of the calibration file matches the LED drive power information successfully, execute step A3, otherwise end the loop;

A3: The driving current calibration device sends different driving current generation instructions to the LED driving power supply multiple times, and receives the generated driving current value from the LED driving power supply after each sending, thereby forming multiple current coordinates and calculating the dimming level equation;

A4: Select the target driving current value according to the calibration file, and use the dimming level equation to obtain the target dimming level;

A5: The driving current calibration device adjusts the 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 between the actual driving current value and the target driving current value is less than or equal to the preset error value of the calibration file;

A6: The LED driver power supply sets the actual driving current at this time to the driving current value of the gear corresponding to the target driving current value, and combines it with the maximum gear driving current value to generate a new dimming curve.

Furthermore, the step A3 includes the following sub-steps:

A31: The driving current calibration device sends a maximum driving current generation instruction to the LED driving power supply, and receives the generated maximum driving current value from the LED driving power supply after sending, and forms a first current coordinate (dimmerLeve1, current1) according to the dimming level and driving current value of the driving current at this time; 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 the maximum driving current to the LED driving power supply, and receives the generated half the maximum driving current value from the LED driving power supply after sending, and forms a second current coordinate (dimmerLeve2, current2) according to the dimming level and driving current value of the driving current at this time; wherein dimmerLeve2 represents the dimming level of half the maximum driving current, and current2 represents the half the maximum driving current value;

A33: Substitute the first current coordinate (dimmerLeve1, current1) and the second current coordinate (dimmerLeve2, current2) into the dimming curve equation corresponding to the LED driving power supply, and calculate the dimming level equation.

Furthermore, the step A5 includes the following sub-steps:

A51: The driving current calibration device sends a target dimming level to the LED driving power supply, and receives a generated actual driving current value from the LED driving power supply;

A52: Determine whether the difference between the actual driving current value and the target driving current value is less than or equal to the preset error value in the calibration file; if so, execute step A6; otherwise, execute step A53;

A53: Adjust the target dimming level according to the level adjustment value of the calibration file, and then perform step A51.

Furthermore, the step A6 includes the following sub-steps:

A61: The driving current calibration device sends a save instruction to the LED driving power supply, and the LED driving power supply saves the actual driving current value at this time as the calibrated gear driving current value corresponding to the gear of the target driving current value;

A62: After the LED driver power supply is powered on again, the theoretical gear drive current value is positively compensated or negatively compensated according to the difference between the calibrated gear drive current value and the theoretical gear drive current value of the gear, and the compensated theoretical gear drive current value is obtained;

A63: The LED driver generates a new dimming curve based on the compensated theoretical gear drive current value and the maximum gear drive current value.

Furthermore, in step A4: the target driving current value selected according to the calibration file is the target minimum gear driving current value.

Furthermore, in step A5: the preset error value of the calibration file is the current value corresponding to the dimming step duty cycle between two dimming levels.

Furthermore, in the sub-step A33, the dimming curve equation is: , where dimmingLeve 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: if the actual driving current value is greater than the target driving current value, the target dimming level is reduced by a level adjustment value; if the actual driving current value is less than the target driving current value, the target dimming level is increased by a level adjustment value; and then step A51 is executed.

Furthermore, the step A1 includes: the communication terminal of the driving current calibration device is electrically connected to the communication terminal of the LED driving power supply, and the input terminal of the driving current device is electrically connected to the output terminal of the LED driving power supply.

A driving current calibration device, using the above-mentioned driving current calibration method of an LED driving power supply; comprising a communication unit, a controller unit, a digital-to-analog conversion unit, an operation unit and a display unit; 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 to the first input end of the controller unit, the first output end of the controller unit is electrically connected to the input end of the communication unit, the second input end of the controller unit is electrically connected to the output end of the operation unit, and the second output end of the controller unit is electrically connected to the input end of the display unit.

The technical solution provided by the present invention may include the following beneficial effects: a driving current calibration device reflects the actual dimming performance of an LED driving power supply by fitting a dimming equation, and 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, and adjusts the target dimming level by the level adjustment value of the calibration file, so that the actual driving current value approaches 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 it with the maximum gear driving current value to be applicable to different types of LED driving power supplies, thereby realizing the update of the dimming curve of the LED driving power supply, and then completing the calibration of the driving current values of all gears, without the need to calibrate each gear one by one, and the calibration time is short, which effectively improves work efficiency, production efficiency or R&D progress, etc.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of a driving current calibration method of an LED driving power supply according to one embodiment of the present invention.

FIG. 2 is a schematic diagram of a driving current calibration device according to one embodiment of the present invention.

Among them: communication unit 1, controller unit 2, digital-to-analog conversion unit 3, operation unit 4, display unit 5.

DETAILED DESCRIPTION

Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

1 to 2 , a driving current calibration method and device of an LED driving power supply according to an embodiment of the present invention will be described.

A method for calibrating a driving current of an LED driving power supply comprises the following steps:

A1: The LED driving power supply is electrically connected to the driving current calibration device;

A2: Import the calibration file into the drive current calibration device. When the identification information of the calibration file matches the LED drive power information successfully, execute step A3, otherwise end the loop;

A3: The driving current calibration device sends different driving current generation instructions to the LED driving power supply multiple times, and receives the generated driving current value from the LED driving power supply after each sending, thereby forming multiple current coordinates and calculating the dimming level equation;

A4: Select the target driving current value according to the calibration file, and use the dimming level equation to obtain the target dimming level;

A5: The driving current calibration device adjusts the 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 between the actual driving current value and the target driving current value is less than or equal to the preset error value of the calibration file;

A6: The LED driver power supply sets the actual driving current at this time to the driving current value of the gear corresponding to the target driving current value, and combines it with the maximum gear driving current value to generate a new dimming curve.

The present invention proposes a preferred embodiment of a driving current calibration method for an LED driving power supply, as shown in Figure 1. First, after the LED driving power supply is electrically connected to the driving current calibration device, a calibration file is imported into the driving current calibration device, and the identification information of the calibration file (such as the LED driving power supply model number, material number, etc.) is used to match the information with the LED driving power supply to avoid calibration object errors.

Then, different driving current generation instructions are sent to the LED driving power supply multiple times through the driving current calibration device, and the generated driving current value is received from the LED driving power supply after each sending, which is equivalent to sending different dimming levels, and knowing the actual driving current values generated by this LED driving power supply at different dimming levels, so as to form multiple current coordinates and calculate the dimming level equation, so that this dimming level equation can truly reflect the dimming performance (or dimming curve) of the LED driving power supply.

On this basis, the dimming level equation can be used to calibrate the inaccurate dimming curve that has been burned into the LED driver. According to the target driving current value to be calibrated selected by the calibration file (that is, the brightness that the gear wants to get, which can be the driving current value of any gear), substitute it into the dimming level equation to get the corresponding target dimming level, and send it to the LED driver to get its actual driving current value, so as to judge how much the target and the actual difference are, and reduce the difference between the target and the actual by adjusting the target dimming level until it is within the error range (that is, the difference is less than or equal to the preset error value of the calibration file).

Finally, the LED driver power supply sets the calibrated actual drive current as the drive current value of the gear corresponding to the target drive current value, combined with the maximum gear drive current value (because the maximum drive current value is unchanged and does not need to be calibrated), and uses the two-point current values and their corresponding duty cycles to enable the LED driver power supply to generate a new dimming curve.

In summary, the driving current calibration device reflects the real dimming performance of the LED driving power supply by fitting the dimming equation, and 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, and adjusts the target dimming level by the level adjustment value of the calibration file, so that the actual driving current value is close 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 it with the maximum gear driving current value. It can be applicable to different types of LED driving power supplies, realize the dimming curve update of the LED driving power supply, and then complete the calibration of the driving current values of all gears. There is no need to calibrate each gear one by one, and the calibration time is short, which effectively improves work efficiency, production efficiency or R&D progress.

Furthermore, step A3 includes the following sub-steps:

A31: The driving current calibration device sends a maximum driving current generation instruction to the LED driving power supply, and receives the generated maximum driving current value from the LED driving power supply after sending, and forms a first current coordinate (dimmerLeve1, current1) according to the dimming level and driving current value of the driving current at this time; 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 the maximum driving current to the LED driving power supply, and receives the generated half the maximum driving current value from the LED driving power supply after sending, and forms a second current coordinate (dimmerLeve2, current2) according to the dimming level and driving current value of the driving current at this time; wherein dimmerLeve2 represents the dimming level of half the maximum driving current, and current2 represents the half the maximum driving current value;

A33: Substitute the first current coordinate (dimmerLeve1, current1) and the second current coordinate (dimmerLeve2, current2) into the dimming curve equation corresponding to the LED driving power supply, and calculate the dimming level equation.

In this embodiment, based on the fact that the dimming curves commonly used by current LED driving power supplies are linear dimming curves and logarithmic dimming curves, which correspond to linear equations and logarithmic equations respectively, the two current coordinates can be used to confirm the dimming curve equation corresponding to the dimming curve, that is, the dimming level equation. Therefore, it is preferred to use two current coordinates to determine the dimming level equation, which greatly shortens the calibration time.

Because the maximum driving current and half the maximum driving current are more certain than other driving currents, the dimming level is easier to correspond to the driving current, so the dimming level equation using the maximum driving current and half the maximum driving current as the two current coordinates to confirm is the most accurate.

Furthermore, step A5 includes the following sub-steps:

A51: The driving current calibration device sends a target dimming level to the LED driving power supply, and receives a generated actual driving current value from the LED driving power supply;

A52: Determine whether the difference between the actual driving current value and the target driving current value is less than or equal to the preset error value in the calibration file; if so, execute step A6; otherwise, execute step A53;

A53: Adjust the target dimming level according to the level adjustment value of the calibration file, and then perform step A51.

In this embodiment, since only the actual driving current value of one gear needs to be calibrated, the actual driving current value of this gear will have a significant impact on the calibration effect of the final LED driving power supply. Therefore, the adjustment process to make the actual driving current value approach the target driving current value preferably adopts a cyclic verification method to improve the final accuracy of the actual driving current value.

Furthermore, step A6 includes the following sub-steps:

A61: The driving current calibration device sends a save instruction to the LED driving power supply, and the LED driving power supply saves the actual driving current value at this time as the calibrated gear driving current value corresponding to the gear of the target driving current value;

A62: After the LED driver power supply is powered on again, the theoretical gear drive current value is positively compensated or negatively compensated according to the difference between the calibrated gear drive current value and the theoretical gear drive current value of the gear, and the compensated theoretical gear drive current value is obtained;

A63: The LED driver generates a new dimming curve based on the compensated theoretical gear drive current value and the maximum gear drive current value.

In this embodiment, the relevant dimming data has been burned into the LED driver power supply, so it can only be modified based on the original data. By saving the calibrated actual driving current value (calibration gear driving current value) to the LED driver power supply, after the LED driver power supply is powered on again, the theoretical gear driving current value is positively compensated or negatively compensated according to the difference 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 then combined with the maximum gear driving current value, a new dimming curve is generated to achieve calibration.

Further, 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 for calibration relative to other driving current values. In step A6, it is easier for the LED driving power supply to obtain the duty cycle of all gear driving currents based on the duty cycle of the maximum and minimum driving current values, because the duty cycle of all other gear driving currents is between the two, and the new dimming curve is closer to the target dimming curve.

Furthermore, in step A5: the preset error value of the calibration file is the current value corresponding to the dimming step duty cycle 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 cycle between the two dimming levels, the brightness difference of the LED lamp will be more obvious. In order to maintain the continuity and smoothness of the dimming of the LED lamp, the current value corresponding to the dimming step duty cycle between the two dimming levels is preferably used as the preset error value as the standard for whether the calibration is completed.

Furthermore, in sub-step A33, the dimming curve equation is: , where dimmingLeve is the dimming level of the driving current, current is the driving current value, and k and b are equation coefficients.

In this embodiment, compared with the logarithmic dimming curve, the calibration effect of the LED driving power supply using the linear dimming curve is better, so the dimming curve is preferably , the factors of the first current coordinate (dimmerLeve1, current1) and the second current coordinate (dimmerLeve2, current2) are substituted into the formula to obtain a set of equations. The values of k and b are substituted into the original formula to obtain the dimming curve equation that reflects the dimming performance of the LED driver power supply.

Further, sub-step A53 includes: if the actual driving current value is greater than the target driving current value, the target dimming level is reduced by a level adjustment value; if the actual driving current value is less than the target driving current value, the target dimming level is increased by a level adjustment value; and then step A51 is executed.

In this embodiment, while adopting the method of cyclic verification to improve the final accuracy of the actual driving current value, in order to avoid the actual driving current value floating back and forth near the target driving current value and affecting the calibration efficiency, it is preferred to adopt the method of more reduction and increase for adjustment. More importantly, in order to reduce the number of cycles between sub-steps A51 to A53, the level adjustment value needs to summarize the general error range according to different LED driving power supply types, select an appropriate level adjustment value, and strive to complete the calibration of the actual driving current value within as few cycles as possible to improve the calibration efficiency; and according to the current actual calibration situation, the level adjustment value is preferably in the range of 0.5-2, and the target dimming level can be quickly calibrated by increasing or decreasing 0.5-2 dimming levels. It should be noted that there is a situation where the difference between the target driving current value and the actual driving current value is greater than the preset error value (that is, the current value corresponding to the dimming step duty cycle between the two dimming levels), which does not affect the preset error value as a standard for judging whether the calibration is completed.

Furthermore, step A1 includes: electrically connecting a communication terminal of the driving current calibration device to a communication terminal of the LED driving power supply, and electrically connecting an input terminal of the driving current device to an output terminal of the LED driving power supply.

In this embodiment, because the driving current calibration device needs to interact with the LED driving power supply data and receive the actual driving current value from the LED driving power supply when calibrating the LED driving power supply, the communication end of the driving current calibration device needs to be electrically connected to the communication end of the LED driving power supply, and the input end of the driving current device needs 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.

A driving current calibration device, using the above-mentioned driving current calibration method of an LED driving power supply; comprising a communication unit 1, a controller unit 2, a digital-to-analog conversion unit 3, an operation unit 4 and a display unit 5; 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 to the first input end of the controller unit 2, the first output end of the controller unit 2 is electrically connected to the input end of the communication unit 1, the second input end of the controller unit 2 is electrically connected to the output end of the operation unit 4, and the second output end of the controller unit 2 is electrically connected to the input end of the display unit 5.

In this embodiment, a preferred embodiment of a driving current calibration device is also proposed. As shown in FIG2 , the communication unit 1 (such as serial communication), the controller unit 2 (such as MCU) and the digital-to-analog conversion unit 3 are combined to realize all steps of the driving current calibration method of the above-mentioned LED driving power supply; 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 the calibration data, process and curve, etc.

A driving current calibration method for an LED driving power supply according to an embodiment of the present invention and other structures and operations of the device thereof are well known to those skilled in the art and will not be described in detail here.

In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A method for calibrating a driving current of an LED driving power supply, characterized in that it comprises the following steps: A1: The LED driving power supply is electrically connected to the driving current calibration device; A2: Import the calibration file into the drive current calibration device. When the identification information of the calibration file matches the LED drive power information successfully, execute step A3, otherwise end the loop; A3: The driving current calibration device sends different driving current generation instructions to the LED driving power supply multiple times, and receives the generated driving current value from the LED driving power supply after each sending, thereby forming multiple current coordinates and calculating the dimming level equation; A4: Select the target driving current value according to the calibration file, and use the dimming level equation to obtain the target dimming level; A5: The driving current calibration device adjusts the 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 between the actual driving current value and the target driving current value is less than or equal to the preset error value of the calibration file; A6: The LED driver power supply sets the actual driving current at this time to the driving current value of the gear corresponding to the target driving current value, and combines it with the maximum gear driving current value to generate a new dimming curve. 2. The driving current calibration method of an LED driving power supply according to claim 1, characterized in that: said step A3 comprises the following sub-steps: A31: The driving current calibration device sends a maximum driving current generation instruction to the LED driving power supply, and receives the generated maximum driving current value from the LED driving power supply after sending, and forms a first current coordinate (dimmerLeve1, current1) according to the dimming level and driving current value of the driving current at this time; 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 the maximum driving current to the LED driving power supply, and receives the generated half the maximum driving current value from the LED driving power supply after sending, and forms a second current coordinate (dimmerLeve2, current2) according to the dimming level and driving current value of the driving current at this time; wherein dimmerLeve2 represents the dimming level of half the maximum driving current, and current2 represents the half the maximum driving current value; A33: Substitute the first current coordinate (dimmerLeve1, current1) and the second current coordinate (dimmerLeve2, current2) into the dimming curve equation corresponding to the LED driving power supply, and calculate the dimming level equation. 3. The driving current calibration method of an LED driving power supply according to claim 1, characterized in that: the step A5 comprises the following sub-steps: A51: The driving current calibration device sends a target dimming level to the LED driving power supply, and receives a generated actual driving current value from the LED driving power supply; A52: Determine whether the difference between the actual driving current value and the target driving current value is less than or equal to the preset error value in the calibration file; if so, execute step A6; otherwise, execute step A53; A53: Adjust the target dimming level according to the level adjustment value of the calibration file, and then perform step A51. 4. The driving current calibration method of an LED driving power supply according to claim 1, characterized in that: the step A6 comprises the following sub-steps: A61: The driving current calibration device sends a save instruction to the LED driving power supply, and the LED driving power supply saves the actual driving current value at this time as the calibrated gear driving current value corresponding to the gear of the target driving current value; A62: After the LED driver power supply is powered on again, the theoretical gear drive current value is positively compensated or negatively compensated according to the difference between the calibrated gear drive current value and the theoretical gear drive current value of the gear, and the compensated theoretical gear drive current value is obtained; A63: The LED driver generates a new dimming curve based on the compensated theoretical gear drive current value and the maximum gear drive current value. 5. A driving current calibration method for an LED driving power supply according to claim 1, characterized in that: in said step A4: the target driving current value selected according to the calibration file is the target minimum gear driving current value. 6. A driving current calibration method for an LED driving power supply according to claim 1, characterized in that: in said step A5: the preset error value of the calibration file is the current value corresponding to the dimming step duty cycle between two dimming levels. 7. The driving current calibration method of an LED driving power supply according to claim 2, characterized in that: in the sub-step A33, the dimming curve equation is , where dimmingLeve is the dimming level of the driving current, current is the driving current value, and k and b are equation coefficients. 8. A driving current calibration method for an LED driving power supply according to claim 3, characterized in that: the sub-step A53 includes: if the actual driving current value is greater than the target driving current value, the target dimming level is reduced by a level adjustment value; if the actual driving current value is less than the target driving current value, the target dimming level is increased by a level adjustment value; and then step A51 is executed. 9. A driving current calibration method for an LED driving power supply according to claim 1, characterized in that: the step A1 comprises: a communication end of the driving current calibration device is electrically connected to a communication end of the LED driving power supply, and an input end of the driving current device is electrically connected to an output end of the LED driving power supply. 10. A driving current calibration device, characterized in that: the driving current calibration method of an LED driving power supply according to any one of claims 1 to 9 is applied; comprising a communication unit, a controller unit, a digital-to-analog conversion unit, an operation unit and a display unit; 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 to the first input end of the controller unit, the first output end of the controller unit is electrically connected to the input end of the communication unit, the second input end of the controller unit is electrically connected to the output end of the operation unit, and the second output end of the controller unit is electrically connected to the input end of the display unit.