Power derating method of lamp group, controller and computer program product

Abstract

A lamp group power derating method, controller and computer program product. The lamp group power derating method comprises: obtaining working parameter values related to reducing lamp group output power, determining total output power threshold P Th of the lamp group under the obtained working parameter values, minimum output power and reducible power of each functional safety lamp group; if P Th is greater than the sum of the minimum output power of the functional safety lamp groups, calculating a derating coefficient of the lamp group, and then respectively reducing the output power of each non-functional safety lamp group and each functional safety lamp group according to the calculated derating coefficient, if P Th is less than or equal to the sum of the minimum output power of the functional safety lamp groups, controlling all non-functional safety lamp groups to be turned off, and controlling each functional safety lamp group to work at the minimum output power. The present application has small calculation amount, good consistency of lamp group brightness change, and can maintain the full power output capability of the functional safety lamp group after derating.

Description

Technical Field

[0001] This invention relates to lighting control technology, and more particularly to a protection method when the power of a lighting unit is too high. Background Technology

[0002] When the temperature of the lamp assembly, the temperature of the lamp assembly controller, or the voltage of the lamp assembly power supply is too high (the above three operating parameters are just examples; there are many other reasons for reducing lamp assembly power), in order to protect the safety of the lamp assembly, the total output power of the lamp assembly must be controlled below a certain threshold. The lamp assembly controller will reduce the output current of the lamp assembly and / or reduce the duty cycle of the PWM signal output to the lamp assembly to achieve the purpose of reducing the output power of the lamp assembly and protecting the lamp assembly.

[0003] For automotive lighting systems, there are multiple functional safety lighting units and multiple non-functional safety lighting units. Functional safety lighting units have a minimum output power limit; that is, to meet safety lighting requirements, the actual output power of a functional safety lighting unit must be greater than or equal to a predetermined minimum output power. Functional safety lighting units include brake lights, parking lights, and low beam headlights. Non-functional safety lighting units have no minimum output power limit and include high beam headlights, turn signals, and welcome lights. Because the actual output power of functional safety lighting units is subject to additional limitations and needs to be higher than a certain value, it is necessary to calculate an appropriate derating factor for different lighting units. Based on the calculated derating factor, the output current of the lighting unit and / or the duty cycle of the PWM signal output to the lighting unit are reduced, thereby reducing the actual output power of the lighting unit. How efficiently and accurately the derating factor is calculated directly affects product performance. To simplify the description, the following example illustrates the calculation principle and process of the derating factor by reducing the duty cycle of the PWM signal output to the lighting unit.

[0004] Existing methods for calculating the derating factor of lighting units include recursive calculation and fixed derating.

[0005] Method 1: Recursive Calculation Method First, treat all lamp groups as non-functional safety lamp groups, based on their original total power P. Ori And the total output power threshold P under a certain operating parameter value (this operating parameter is related to reducing the output power of the lamp group, and can be the temperature of the lamp group controller, the temperature of the lamp group, the voltage of the lamp group's power supply, etc.). Th Calculate the reduction factor, factor=P Th / P Ori Then, based on the original duty cycle of each lamp group... Orix Calculate the theoretical value of the output duty cycle for each lamp group: duty x =factor*duty OrixNext, check the theoretical value of the output duty cycle of each functional safety lamp group. x Is it higher than or equal to the minimum output duty cycle of the functional safety lamp group? minx 'x' represents the lamp group number. For example, 'duty1' represents the theoretical value of the output duty cycle of functional safety lamp group 1 (i.e., the first functional safety lamp group). min1 This indicates the minimum output duty cycle of functional safety lamp group 1.

[0006] For functional safety lamp group 1, if duty1 ≥ duty min1 The actual output duty cycle of the lamp group is then... fusi1 It equals duty1; if duty1 < duty min1 The actual output duty cycle of the safety group lamp is then... fusi1 equals duty min1 Furthermore, the output duty cycle of the remaining lamps must be recalculated based on the actual output power of the functional safety lamp group 1.

[0007] At this time, the actual output power of functional safety lamp group 1 is P. fusi1_minout Based on this calculation result, the remaining original total power P' of functional safety lamp group 1 is calculated. Ori and the remaining total output power threshold P' TH , P' Ori =P Ori -P fusi1_minout , P' TH =P TH -P fusi1_minout Then, the reduction factor factor' is calculated at this time, factor'=P'. Th / P' Ori At this point, the theoretical duty cycle of the remaining lamp groups is duty'. x For: duty x = factor'* duty Orix Then check the duty 'of the remaining functional safety lights one by one. x Is it higher than or equal to the minimum output duty cycle of the remaining functional safety lamp group? minx .

[0008] For functional safety light group 2, if duty' x <duty min2 The actual output duty cycle of this functional safety light group is... fusi2 equals duty min2 Then recalculate the original total power P of the functional safety group using a similar formula. Ori and output power threshold P” THCalculate the derating factor at this point. The theoretical duty cycle value for the remaining lamp groups at this point is [duty value]. x For: duty x = factor"* duty Orix Then check each remaining safety light group individually. x Is it higher than or equal to the minimum output duty cycle of the remaining functional safety lamp group? minx .

[0009] Check all functional safety light assemblies one by one using the method described above. If the remaining functional safety light assemblies all meet the "duty" requirement... x ≥duty minx Then the remaining functional safety light groups and non-functional safety light groups are all in "duty" mode. x Output.

[0010] The following section provides a detailed description of the working principle and calculation process of the recursive calculation method using a specific application example.

[0011] Assume there are three sets of lights in total, two of which are functional safety lights and the remaining set is a non-functional safety light set.

[0012]

[0013] Table 1 Original Configuration

[0014]

[0015] Table 2 Temperature conditions

[0016] Using a recursive calculation method, when the temperature of the lamp controller (i.e., the temperature of the circuit board where the lamp controller is located) is at temperature N, the derating factor is first calculated. At this time, the theoretical duty cycle of each lamp group is... x For: duty x =factor*duty Orix =0.8 * 100% = 80%. At this point, duty1 > duty2. min1 duty2>duty min2 Therefore, the actual output duty cycle of all lamp groups is 80%.

[0017] When the temperature of the lamp controller is at temperature A, the derating factor is first calculated. At this time, the theoretical duty cycle of each lamp group is... x For: duty x =factor*duty Orix =0.5 * 100% = 50%. At this point, duty1 < duty2.min1 Therefore, functional safety light group 1 can only be operated according to duty. min1 (60%) Output, continue to recalculate the remaining original total power P' of this functional safety group 1. Ori and the remaining total output power threshold P' TH , P' Ori =P Ori -P fusi1_minout =P Ori -P fusi1_minout =100-15=85W, P' TH =P TH -P fusi1_minout =50-15=35W, calculate the reduction factor' at this time. At this point, the theoretical duty cycle of the remaining lamp groups is: duty2 = duty3 = factor' * duty Orix =41.17%.

[0018] When the temperature of the lamp controller is at temperature B or temperature C, the corresponding results can also be calculated, and the results are summarized in the table below:

[0019]

[0020] Table 3 Actual output of Method 1

[0021] Method 2: Fixed Amount Reduction Method

[0022] The lamp groups are divided into non-functional safety lamp groups and functional safety lamp groups. The original total power of the non-functional safety lamp groups is denoted by P. Ori_nufusi This indicates that the original total power and total output power thresholds of the functional safety lamp assembly are represented by P. Orifusi and P Th express.

[0023] If scenario 1 occurs, i.e., P Th ≥P Orifusi +P Ori_nufusi In this case, neither the non-functional safety lamp group nor the functional safety lamp group needs to reduce power; both should maintain their original output.

[0024] If scenario 2 occurs, i.e., P Orifusi ≤P Th <P Orifusi +P Ori_nufusi If the functional safety lamp assembly does not require power reduction and maintains its original output, then the non-functional safety lamp assembly will be derated according to the derating factor. .

[0025] If scenario 3 occurs, i.e., P Th <P OrifusiIf the non-functional safety lamp group is turned off, the functional safety lamp group will output at the minimum duty cycle.

[0026] Let's continue with the application examples given in Tables 1 and 2. Using the fixed derating method, when the lamp controller's temperature is at temperature N, the power relationship is as described in Case 2. In this case, the functional safety lamps do not need to reduce power and maintain their original output (100% duty cycle). The derating factor for the non-functional safety lamps is: .

[0027] When the lamp controller is at temperature A, the power distribution is as described in Case 2. Functional safety lamps do not require power reduction and maintain their original output (100% duty cycle). The derating factor for non-functional safety lamps is: .

[0028] When the lamp controller temperature is between temperature B and temperature C, the power distribution is as described in case 3. At this time, the non-functional safety lamps are off, and the functional safety lamps output at their minimum duty cycle. The results are summarized in the table below:

[0029]

[0030] Table 4 Actual output of Method 2

[0031] Both of the above-mentioned existing technical solutions have shortcomings, which are analyzed and explained in detail below.

[0032] I. Disadvantages of recursive calculation method: 1. The computational load is too large; This method introduces a large number of recursive calculations, which is particularly disadvantageous in projects with multiple light groups (more than 200 light groups). 2. Inconsistent power reduction ratios in functional safety lighting units can lead to lighting effects that do not meet expectations. Method 1 only allows some functional safety light groups to output at their minimum duty cycle, resulting in inconsistent lighting effects. As seen in the application example (Table 3), when the temperature of the light group controller changes from temperature A to temperature B, the duty cycle of functional safety light group 1 remains at 60%, while functional safety light group 2 and non-functional safety light group 3 gradually dim. This effectively creates the visual effect that functional safety light group 1 remains unchanged, while the other two light groups dim. Clearly, this visual effect does not meet the user's expectations.

[0033] II. Disadvantages of the fixed reduction method: 1. Power derating causes visual discontinuity; Functional safety lighting units only have two states: original output and minimum duty cycle output. These two states have significantly different visual effects, resulting in a poor user experience. Assume the temperature of the lighting unit controller rises from temperature N to temperature A, and then continues to rise to temperature B. Through application examples (Table 4), it is easy to see that when the temperature of the lighting unit controller rises from temperature N to temperature A, the maximum allowable total power P... TH The power was gradually reduced from 80W to 50W. During this process, the output duty cycle of the non-functional safety lamp group 3 changed drastically, dropping sharply from 100% to 0%, while the output duty cycles of the functional safety lamp groups 1 and 2 remained unchanged. As the temperature continued to rise until the temperature of the lamp group controller was slightly higher than temperature A, the maximum allowable total power P was then determined. TH Since the output power is less than 50W, the duty cycles of functional safety lamp group 1 and functional safety lamp group 2 drop sharply to 60% and 30% respectively. 2. When the functional safety lamp assembly experiences power derating, it fails to reach the product's full power output, thus wasting the product's performance; As can be seen from the example (Table 4), when the temperature of the lamp controller reaches temperature B, the product's maximum allowable output power is 25W, but the actual total output power is only 22.5W, wasting 2.5W of output performance. Summary of the Invention

[0034] The technical problem to be solved by the present invention is to provide a method, controller and computer program product for power derating of lamp groups, which has low computational load, good consistency of lamp group brightness change, and can maintain the full power output capability of functional safety lamp groups after derating.

[0035] According to a first aspect of the present invention, a method for power derating a lamp assembly is provided, the lamp assembly comprising a plurality of functionally safe lamp assemblies and a plurality of non-functionally safe lamp assemblies, wherein the functionally safe lamp assemblies have a minimum output power limit, and the non-functionally safe lamp assemblies do not have a minimum output power limit, the method for power derating the lamp assembly comprising:

[0036] Obtain the operating parameter values ​​related to reducing the output power of the lamp group, and determine the total output power threshold P of the lamp group under the obtained operating parameter values. Th Minimum output power P of each functional safety lamp group fusi_mini and can reduce power P fusi_derai Where i is the serial number of the functional safety lamp group, i=1,2,...,N; and the minimum output power P of each functional safety lamp group. fusi_mini and can reduce power P fusi_derai The sum equals the original power of the functional safety lamp group; if The derating factor for the lighting units is calculated using the following formula: P Ori_nufusiThe original total power of the plurality of non-functional safety lamp groups is given, and then the output power of each non-functional safety lamp group and each functional safety lamp group is reduced according to the calculated derating factor. if This will turn off all non-functional safety lights and control each functional safety light group to operate at its minimum output power P. fusi_mini Work.

[0037] According to a second aspect of the present invention, a lamp controller is provided, comprising: a memory for storing a program; and a processor for loading the program to execute the power derating method for the lamp described above.

[0038] According to a third aspect of the present invention, a computer program product is provided, comprising a computer program that, when executed by a processor, implements the aforementioned power derating method for a lamp assembly.

[0039] This invention has at least the following advantages and features: 1. In this embodiment of the invention, the original power of the functional safety lamp group is regarded as the sum of the minimum output power part and the power that can be reduced, so that the functional safety lamp group can be steplessly adjusted between "no power reduction" and "reduced to the minimum output power". All functional safety lamp groups are reduced in a coordinated manner, which ensures the consistency of lighting effect to the greatest extent. 2. The embodiments of the present invention do not require recursive calculations, thus reducing the amount of repetitive calculations; 3. In the process of reducing the output power of the lamp assembly, the present invention maintains the maximum output capacity of the lamp assembly, thereby improving the output performance of the product. Attached Figure Description

[0040] Figure 1 A schematic flowchart of a power derating method for a lamp assembly according to an embodiment of the present invention is shown. Detailed Implementation

[0041] Figure 1 A schematic flowchart of a power derating method for a lamp assembly according to an embodiment of the present invention is shown below. Please refer to... Figure 1 According to an embodiment of the present invention, a power derating method for a lamp assembly is applied to a lamp assembly controller. The lamp assembly includes several non-functional safety lamp assemblies and several functional safety lamp assemblies. The functional safety lamp assemblies have a minimum output power limit, while the non-functional safety lamp assemblies do not have a minimum output power limit. The power derating method for the lamp assembly includes the following steps: Obtain the operating parameter values ​​related to reducing the output power of the lamp group, and determine the total output power threshold P of the lamp group under the obtained operating parameter values. Th Minimum output power P of each functional safety lamp group fusi_mini and can reduce power P fusi_deraiWhere i is the serial number of the functional safety lamp group, i=1,2,...,N; and the minimum output power P of each functional safety lamp group. fusi_mini and can reduce power P fusi_derai The sum equals the original power of the functional safety lamp group; if The derating factor for the lighting units is calculated using the following formula: P Ori_nufusi The original total power of the plurality of non-functional safety lamp groups is given, and then the output power of each non-functional safety lamp group and each functional safety lamp group is reduced according to the calculated derating factor. if This will turn off all non-functional safety lights and control each functional safety light group to operate at its minimum output power P. fusi_mini Work.

[0042] The term "several" as used above refers to one or more, and the operating parameters related to reducing the output power of the lamp group include, but are not limited to, the temperature of the lamp group controller, the temperature of the lamp group, or the voltage of the lamp group's power supply.

[0043] In some specific implementations, the controller obtains the temperature of the lamp group controller in real time by collecting the temperature detection results from the temperature detection component, and then bases the temperature on a pre-stored value and the total output power threshold P of the lamp group. Th The relationship between the minimum output power of each functional safety lamp group and the power reduction capability of each functional safety lamp group determines the total output power threshold P of the lamp group at the acquired temperature. Th The minimum output power and the power that can be reduced for each functional safety lamp group.

[0044] In some specific implementations, the aforementioned reduction of the output power of each non-functional safety lamp group and each functional safety lamp group according to the calculated derating factor specifically includes: Based on the calculated derating factor, calculate the output duty cycle of each non-functional safety lamp group and the output duty cycle of each functional safety lamp group, where the output duty cycle of the j-th non-functional safety lamp group is... nufusij For: duty nufusij = duty Orij *factor, duty Orij The original duty cycle of the j-th non-functional safety lamp group is given by [value], where j is the sequence number of the non-functional safety lamp group, j = 1, 2, ..., M. The output duty cycle of the i-th functional safety lamp group is given by [value]. fusii For: duty fusii =duty fusi_derai *factor+duty fusi_mini, i is the serial number of the functional safety lamp group, i=1,2,...,N, duty fusi_mini and duty fusi_derai These are the minimum output duty cycle and the power reduction duty cycle of the i-th functional safety lamp group, respectively. Each non-functional safety lamp group and each functional safety lamp group are driven by a PWM drive signal with a calculated output duty cycle.

[0045] The aforementioned control of each functional safety lamp group to achieve minimum output power P fusi_mini The work includes: using PWM signals with the minimum output duty cycle of each functional safety lamp group to drive each functional safety lamp group.

[0046] In this embodiment of the invention, the original power of the i-th functional safety lamp group is considered as two parts: the minimum output power P fusi_mini and can reduce power P fusi_derai (The corresponding duty cycles are the minimum output duty cycle and the duty cycle respectively.) fusi_mini and can reduce power duty cycle fusi_derai The sum of the two parts equals the original total power of the i-th functional safety lamp group, allowing the functional safety lamp group to be steplessly adjusted between "no power reduction" and "reduced to minimum output power". All functional safety lamp groups work together to reduce the derating, ensuring the consistency of lighting effects to the greatest extent.

[0047] In some specific implementations, the aforementioned light assembly is an LED light assembly. More specifically, the aforementioned light assembly is an automotive light assembly, with functional safety light assemblies including brake lights, side marker lights, and low beam headlights, and the aforementioned non-functional safety light assemblies including high beam headlights, turn signals, and welcome lights.

[0048] The following examples, in conjunction with the application examples given in Tables 1 and 2, illustrate the working principle and process of the power derating method for lamp groups in this embodiment of the invention.

[0049] The original total power P of the non-functional safety lamp group Ori_nufusi =50W (“nufusi” indicates non-functional safety, where i is not a subscript); the original power of the two functional safety lamp groups is preset in two parts: the minimum output power P of functional safety lamp group 1. fusi_min1 =15W, minimum output power P of functional safety lamp group 2 fusi_min2 =7.5W, the power P of functional safety lamp group 1 can be reduced. fusi_dera1 =10W, the power reduction P of the functional safety lamp group 2 fusi_dera2 =17.5W, corresponding to the minimum output duty cycle. fusi_min1 =60%, duty fusi_min2 =30%, which can reduce the power duty cycle. fusi_dera1=40%, duty fusi_dera2 =70%.

[0050] When the temperature of the lamp controller is at temperature N, the total output power threshold P of the lamp group is... Th =80W. The derating factor (facor) for the lamp assembly is: The output duty cycle of non-functional safety lamp group 3 is [duty]. nufus1 = duty Ori1 *factor=100%*74.19%=74.19%, the output duty cycle of functional safety lamp group 1 and functional safety lamp group 2 is: duty fusi1 = duty fusi_dera1 *factor+duty fusi_min1 =40% * 74.19% + 60% = 89.67%, duty fusi2 = duty fusi_dera2 *factor+duty fusi_min2 =70%*74.19%+30%=81.93%.

[0051] When the temperature of the lamp controller is at temperature A, the total output power threshold P of the lamp group is... Th =50W. The derating factor (facor) for the lamp assembly is: The output duty cycle of non-functional safety lamp group 3 is [duty]. nufus1 = duty Ori1 *factor=100%*35.48%=35.48%, the output duty cycle of functional safety lamp group 1 and functional safety lamp group 2 is: duty fusi1 = duty fusi_dera1 *factor+duty fusi_min1 =40%*35.48%+60%=74.19%, duty fusi2 = duty fusi_dera2 *factor+duty fusi_min2 =70%*35.48%+30%=54.84%.

[0052] When the temperature of the lamp controller is at temperature B, the total output power threshold P of the lamp group is... Th =25W. The derating factor for the lamp assembly is: The output duty cycle of the non-functional safety lamp assembly is... nufusi1 = duty Ori1 *factor=100%*3.24%=3.24%, the duty cycle of the functional safety lamp group output. fusi1 = duty fusi_dera1 *factor+dutyfusi_min1 =40% * 3.24% + 60% = 61.29%, duty fusi2 =duty fusi_dera2 *factor+duty fusi_min2 =70%*3.24%+30%=32.26%.

[0053] When the temperature of the lamp controller is at temperature C, the output power threshold P Th =20W, satisfied The conditions are as follows: Therefore, the non-functional safety light group 3 is turned off, and the functional safety light group 1 is driven by a PWM drive signal with the minimum output duty cycle (60%) of the functional safety light group 1, while the functional safety light group 2 is driven by a PWM drive signal with the minimum output duty cycle (30%) of the functional safety light group 2 (to ensure vehicle driving safety, the brightness of the functional safety light groups is prioritized to be higher than the minimum brightness). Therefore, at this time, the sum of the minimum output power of functional safety light group 1 and functional safety light group 2, 22.5W, exceeds the 20W output power threshold P. Th Exceeding the output power threshold may affect the lifespan of the lamp assembly and its controller, and may cause abnormal overheating. However, ensuring that functional safety lamp assemblies operate at minimum output power is a crucial guarantee for vehicle driving safety. Therefore, even if it affects the product's lifespan, it is essential to ensure that functional safety lamp assemblies operate at minimum output power.

[0054] The results are summarized in the table below:

[0055]

[0056] Table 5 Actual output of embodiments of the present invention

[0057] As shown in Table 5, the power derating method of the lamp group in this embodiment of the invention reduces the duty cycle of the PWM drive signals of all three lamp groups (i.e., reduces the output power), thereby reducing the brightness of all three lights and achieving a visually uniform dimming effect, which is more acceptable to users. Furthermore, it maintains smooth temperature changes across all temperature ranges, greatly ensuring the lighting effect. Moreover, it maintains the full power output capability of the functional safety lamp group after derating.

[0058] Embodiments of the present invention also provide a vehicle lighting controller, which includes a memory and a processor. The memory is used to store a program; the processor is used to load the program to execute the above-described power derating method for the lamp assembly.

[0059] Embodiments of the present invention also provide a computer program product, including a computer program that, when executed by a processor, implements the above-described power derating method for lamp groups.

[0060] This invention can be applied to lighting scenarios with minimum output limitations.

Claims

1. A method for power derating a lamp assembly, the lamp assembly comprising a plurality of functional safety lamp assemblies and a plurality of non-functional safety lamp assemblies, wherein the functional safety lamp assemblies have a minimum output power limit, and the non-functional safety lamp assemblies have no minimum output power limit, characterized in that, The power derating method for the lamp assembly includes: acquiring a working parameter value related to reducing the output power of the lamp group, determining a total output power threshold P of the lamp group at the acquired working parameter value Th , the minimum output power P of each functional safety lamp group fusi_mini and the reducible power P fusi_derai , wherein i is the serial number of the functional safety lamp group, i = 1, 2, …, N; the sum of the minimum output power P fusi_mini and the reducible power P fusi_derai of each functional safety lamp group is equal to the original power of the functional safety lamp group; if The derating factor for the lighting units is calculated using the following formula: P Ori_nufusi The original total power of the plurality of non-functional safety lamp groups is given, and then the output power of each non-functional safety lamp group and each functional safety lamp group is reduced according to the calculated derating factor. if This will turn off all non-functional safety lights and control each functional safety light group to operate at its minimum output power P. fusi_mini Work.

2. The power derating method for lamp groups according to claim 1, characterized in that, The specific steps of reducing the output power of each non-functional safety lamp group and each functional safety lamp group according to the calculated derating factor include: Based on the calculated derating factor, calculate the output duty cycle of each non-functional safety lamp group and the output duty cycle of each functional safety lamp group, where the output duty cycle of the j-th non-functional safety lamp group is... nufusij For: duty nufusij =duty Orij *factor, duty Orij The original duty cycle of the j-th non-functional safety lamp group is given by the given value, where j is the sequence number of the non-functional safety lamp group, j=1,2,...,M. The output duty cycle of the i-th functional safety lamp group is given by the given value. fusii For: duty fusii = duty fusi_derai *factor+duty fusi_mini , i is the serial number of the functional safety lamp group, i=1,2,...,N, duty fusi_mini and duty fusi_derai These are the minimum output duty cycle and the power reduction duty cycle of the i-th functional safety lamp group, respectively; Each non-functional safety lamp group and each functional safety lamp group are driven by a PWM drive signal with a calculated output duty cycle.

3. The power derating method for lamp groups according to claim 1 or 2, characterized in that, The control of each functional safety lamp group to achieve minimum output power P fusi_mini The work includes: using PWM signals with the minimum output duty cycle of each functional safety lamp group to drive each functional safety lamp group.

4. The power derating method for lamp groups according to claim 1, characterized in that, The operating parameters related to reducing the output power of the lamp assembly are the temperature of the lamp assembly controller, the temperature of the lamp assembly, or the voltage of the lamp assembly's power supply.

5. The power derating method for lamp groups according to claim 1, characterized in that, The light assembly is an LED light assembly.

6. The power derating method for lamp groups according to claim 1, characterized in that, The light assembly is a car light assembly.

7. A lamp group controller, characterized in that, include: Memory, used to store programs; A processor for loading the program to execute the power derating method for the lamp group as described in any one of claims 1 to 6.

8. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the power derating method for the lamp group as described in any one of claims 1 to 6.

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