Method and System for Determining Illuminance of White Light LED Device

Abstract

The present invention relates to a method and system for determining the illuminance of a white LED device, belonging to the field of white LEDs. The method includes obtaining the driving characteristics and heat sink temperature of the white LED device; the driving characteristics include voltage amplitude, bias voltage, frequency, and gain coefficient; determining the output illuminance of the white LED device according to the driving characteristics and the heat sink temperature. By considering the influence of driving characteristics and temperature, the present invention improves the determination accuracy of the illuminance of the white LED device.

Description

Technical Field

[0001] The present invention relates to the field of white light LEDs, and particularly to a method and system for determining the illuminance of a white light LED device. Background Art

[0002] During the application process of white light LED devices, the driving power supply is a very crucial part of the LED lighting source, and the driving method of the LED lighting source will directly affect the lighting effect of the LED source. Directly using AC drive for white light LED products can simplify the design and has a lower cost. Currently, most commercial white light LED products use a DC conversion circuit to convert AC power supply into DC power supply to drive the LED products. Compared with the complex DC conversion circuit design, AC drive is the mainstream trend for the future development and popularization of LED products. However, the LED light source driven by AC will generate a certain stroboscopic phenomenon during use. The main reasons for this phenomenon are: the frequency fluctuation of the driving power supply, the instability of the driving voltage, etc.

[0003] The driving power supply of LED products is significantly affected by factors such as driving voltage, driving frequency, driving power, and ambient temperature. Only by selecting appropriate driving conditions can the stable light output of the LED source be ensured. Since the requirements of LED products for the driving power supply are very strict, and the overall life of the driving circuit will be affected by various factors, especially the key components will be severely affected by temperature and voltage changes, which will in turn affect the stability and reliability of white light LED products. Although there is a close relationship between the driving power supply and the light efficiency and service life of LED products, there is currently no reported quantitative model for the relationship between the above-mentioned driving parameter variables. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and system for determining the illuminance of a white light LED device, which can improve the determination accuracy of the illuminance of the white light LED device by considering the influence of driving characteristics and temperature.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] A method for determining the illuminance of a white light LED device, comprising:

[0007] Obtaining the driving characteristics and the heat sink temperature of the white light LED device; the driving characteristics include voltage amplitude, bias voltage, frequency, and gain coefficient;

[0008] Determining the output illuminance of the white light LED device according to the driving characteristics and the heat sink temperature.

[0009] Optionally, the determining the output illuminance of the white light LED device according to the driving characteristics and the heat sink temperature specifically includes:

[0010] Determine the relationship between illuminance and frequency according to the said frequency;

[0011] Determine the relationship between illuminance and voltage amplitude according to the said voltage amplitude;

[0012] Construct a two-dimensional function between illuminance, frequency and voltage amplitude according to the relationship between illuminance and frequency and the relationship between illuminance and voltage amplitude;

[0013] Determine the relationship between illuminance and bias voltage according to the said bias voltage;

[0014] Construct a three-dimensional function between illuminance, frequency, voltage amplitude and bias voltage according to the relationship between illuminance and frequency, the relationship between illuminance and voltage amplitude and the relationship between illuminance and bias voltage;

[0015] Determine the relationship between illuminance and the gain coefficient according to the said gain coefficient;

[0016] Determine the relationship between illuminance and the heat sink temperature according to the said heat sink temperature;

[0017] Determine the output illuminance of the white LED device according to the two-dimensional function between illuminance, frequency and voltage amplitude, the three-dimensional function between illuminance, frequency, voltage amplitude and bias voltage, the relationship between illuminance and the gain coefficient, and the relationship between illuminance and the heat sink temperature.

[0018] Optionally, the expression of the relationship between illuminance and frequency is:

[0019] P f =α1f + β1

[0020] where P f is the illuminance of the white LED device affected by the driving frequency, f is the sine driving frequency of the white LED device, α1 is the first correlation coefficient between illuminance and frequency, and β1 is the second correlation coefficient between illuminance and frequency.

[0021] Optionally, the expression of the relationship between illuminance and voltage amplitude is:

[0022] P v =γ1v + δ1

[0023] where P v is the illuminance of the white LED device affected by the amplitude of the driving waveform, v is the sine driving voltage amplitude of the white LED device, γ1 is the first correlation coefficient between illuminance and voltage amplitude, and δ1 is the second correlation coefficient between illuminance and voltage amplitude.

[0024] Optionally, the expression of the relationship between the illuminance and the heat sink temperature is:

[0025]

[0026] where P t is the illuminance of the white light LED device affected by the heat sink temperature, t is the heat sink temperature of the white light LED device, σ1 is the first correlation coefficient between the illuminance and the heat sink temperature, τ1 is the second correlation coefficient between the illuminance and the heat sink temperature, is the third correlation coefficient between the illuminance and the heat sink temperature.

[0027] Optionally, the expression of the relationship between the illuminance and the bias voltage is:

[0028]

[0029] where P b is the illuminance of the white light LED device affected by the amplitude of the driving waveform, b is the sinusoidal driving bias voltage of the white light LED device, φ1 is the first correlation coefficient between the illuminance and the bias voltage, ω1 is the second correlation coefficient between the illuminance and the bias voltage, is the third correlation coefficient between the illuminance and the bias voltage.

[0030] Optionally, the expression of the relationship between the illuminance and the gain coefficient

[0031] P g = χ 1g - μ1

[0032] where P g is the illuminance of the white light LED device affected by the gain coefficient, g is the sinusoidal driving gain coefficient of the white light LED device, χ1 is the first correlation coefficient between the illuminance and the gain coefficient, μ1 is the second correlation coefficient between the illuminance and the gain coefficient.

[0033] Optionally, the expression of the output illuminance of the white light LED device is:

[0034]

[0035] where P f,v,b,g,t is the output illuminance of the white light LED device, P f is the illuminance of the white light LED device affected by the driving frequency, P v is the illuminance of the white light LED device affected by the amplitude of the driving waveform, P b is the illuminance of the white light LED device affected by the amplitude of the driving waveform, P g is the illuminance output by the white light LED device under the driving gain condition, P tIlluminance affected by heat sink temperature for white LED device, P o Illuminance of white LED device when driving frequency and waveform amplitude are (f0, v0) respectively, P1 is the illuminance of white LED device when driving frequency, waveform amplitude and sine driving bias voltage are (f0, v0, b0) respectively, P2 is the illuminance of white LED device when driving frequency, waveform amplitude, sine driving bias voltage and sine driving gain coefficient are (f0, v0, b0, g0) respectively, P3 is the illuminance of white LED device when driving frequency, waveform amplitude, sine driving bias voltage, sine driving gain coefficient and heat sink temperature are (f0, v0, b0, g0, t0) respectively.

[0036] A system for determining illuminance of white LED device, comprising:

[0037] An acquisition module, configured to acquire driving characteristics and heat sink temperature of the white LED device; the driving characteristics include voltage amplitude, bias voltage, frequency and gain coefficient;

[0038] An output illuminance determination module, configured to determine the output illuminance of the white LED device according to the driving characteristics and the heat sink temperature.

[0039] According to the specific embodiments provided by the present invention, the following technical effects are disclosed:

[0040] The present invention acquires driving characteristics and heat sink temperature of the white LED device; the driving characteristics include voltage amplitude, bias voltage, frequency and gain coefficient; and determines the output illuminance of the white LED device according to the driving characteristics and the heat sink temperature. By considering the output illuminance of the white LED device determined by the driving characteristics and the heat sink temperature, the determination accuracy of the illuminance of the white LED device is improved. Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 Flowchart of the method for determining illuminance of white LED device provided by the present invention;

[0043] Figure 2 Driving frequency - illuminance curve of white LED device;

[0044] Figure 3 It is a graph showing the change trend of the illuminance of a white LED under different driving amplitudes;

[0045] Figure 4 It is a graph showing the change trend of the illuminance of a white LED under different driving bias voltages;

[0046] Figure 5 It is a graph showing the change trend of the illuminance of a white LED under different gain coefficients;

[0047] Figure 6 It is a graph showing the change trend of the illuminance of a white LED under different heat sink temperatures;

[0048] Figure 7 It is a schematic diagram of a method for determining the illuminance of a white LED device. Specific embodiments

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] The object of the present invention is to provide a method and system for determining the illuminance of a white LED device, which improves the determination accuracy of the illuminance of the white LED device by considering the influence of driving characteristics and temperature.

[0051] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] As Figure 1 shown, a method for determining the illuminance of a white LED device provided by the present invention includes:

[0053] Step 101: Obtain the driving characteristics and heat sink temperature of the white LED device; the driving characteristics include voltage amplitude, bias voltage, frequency, and gain coefficient.

[0054] Step 102: Determine the output illuminance of the white LED device according to the driving characteristics and the heat sink temperature.

[0055] Among them, step 102 specifically includes:

[0056] Determine the relationship between illuminance and frequency according to the frequency.

[0057] Determine the relationship between illuminance and voltage amplitude according to the voltage amplitude.

[0058] Construct a two-dimensional function between illuminance, frequency, and voltage amplitude based on the relationship between illuminance and frequency and the relationship between illuminance and voltage amplitude.

[0059] Determine the relationship between illuminance and bias voltage based on the bias voltage.

[0060] Construct a three-dimensional function between illuminance, frequency, voltage amplitude, and bias voltage based on the relationship between illuminance and frequency, the relationship between illuminance and voltage amplitude, and the relationship between illuminance and bias voltage.

[0061] Determine the relationship between illuminance and the gain coefficient based on the gain coefficient.

[0062] Determine the relationship between illuminance and the heat sink temperature based on the heat sink temperature.

[0063] Determine the output illuminance of the white LED device based on the two-dimensional function between illuminance, frequency, and voltage amplitude, the three-dimensional function between illuminance, frequency, voltage amplitude, and bias voltage, the relationship between illuminance and the gain coefficient, and the relationship between illuminance and the heat sink temperature.

[0064] The present invention proposes the dynamic cross-connection law of the sine wave driving characteristics (voltage amplitude, bias voltage, frequency, gain coefficient), heat sink temperature, and white LED illuminance. On this basis, a quantitative model for predicting the optical characteristics of white LED devices is established. Through this evaluation model and the characteristic parameters related to the sine wave driving characteristics (voltage amplitude, bias voltage, frequency, gain coefficient), the optical characteristics of white LEDs can be accurately evaluated, and then the illuminance generated by white LED devices can be calculated. In addition, this method provides a fast modeling and simulation solution for designing the optimal sine wave driving characteristic parameter conditions to ensure the efficiency and stability of white LED device light emission.

[0065] The present invention provides a method for directly obtaining the illuminance of a white LED device through characteristic parameters related to sine wave driving characteristics (voltage amplitude, bias voltage, frequency, gain coefficient). Through this method, the illuminance of a white LED device under any voltage amplitude, bias voltage, frequency, gain coefficient, and other parameters can be determined, and then the illuminance of white LEDs under different driving parameters and operating states can be determined, providing a theoretical basis for lighting engineers in the design and improvement of white LED devices.

[0066] As Figure 7 shown, taking a white LED device as an example, the LED illuminance P affected by the driving frequency, that is, the relationship between illuminance and frequency, can be expressed as

[0067] P f= α1f + β1 (1)

[0068] Where P f is the illuminance of the white LED device affected by the driving frequency, f is the sinusoidal driving frequency of the white LED device, α1 is the first correlation coefficient between the illuminance and the frequency, and β1 is the second correlation coefficient between the illuminance and the frequency.

[0069] The illuminance of the white LED is determined by the sinusoidal driving characteristics (voltage amplitude, bias voltage, frequency, gain coefficient) and is affected by the temperature of the heat sink of the white LED device. Therefore, the illuminance P of the white LED device affected by the amplitude of the driving waveform v That is, the relationship between the illuminance and the voltage amplitude is expressed as

[0070] P v = γ1v + δ1 (2)

[0071] Where P v is the illuminance of the white LED device affected by the amplitude of the driving waveform, v is the sinusoidal driving voltage amplitude of the white LED device, γ1 is the first correlation coefficient between the illuminance and the voltage amplitude, and δ1 is the second correlation coefficient between the illuminance and the voltage amplitude.

[0072] From the power supply of the driving power to the excitation of photons by the white LED chip, part of the electrical energy is converted into light energy by the white LED device, and another part of the electrical energy is converted into heat during the transmission and electron recombination processes. The temperature of the heat sink of the device will have an important impact on the luminous efficiency of the white LED chip due to the junction temperature effect. Among them, when driven by a sinusoidal driving waveform, the relationship between the illuminance of the white LED device and the temperature of the heat sink can be expressed as

[0073]

[0074] Where P t is the illuminance of the white LED device affected by the temperature of the heat sink, t is the temperature of the heat sink where the white LED device is located. When t = 20 °C (ambient temperature), the illuminance of the white LED device is P 0,t . Since the white LED device is placed in a temperature control device, the white LED chip is less affected by the ambient temperature. Therefore, the junction temperature effect caused by the ambient temperature can be ignored. σ1 is the first correlation coefficient between the illuminance and the temperature of the heat sink, τ1 is the second correlation coefficient between the illuminance and the temperature of the heat sink, is the third correlation coefficient between the illuminance and the temperature of the heat sink.

[0075] The bias voltage of the driving power supply also affects the illuminance of white light LEDs. In white light LED devices, the bias voltage of the white light LED device is related to its heat sink temperature, operating current, and heat sink size. Usually, driving the white light LED chip to emit light with a sinusoidal driving power supply bias voltage will affect the heat sink temperature and injection current of the LED device, and in turn affect the load voltage of the LED device chip. On the other hand, the junction temperature of the white light LED chip will affect the injection current of the white light LED chip, thereby affecting the illuminance of the LED device.

[0076] Under actual driving conditions, the illuminance P of the white light LED device b The expression of the relationship between the illuminance and the driving bias voltage b, that is, the relationship between the illuminance and the bias voltage, is:

[0077]

[0078] where P b is the illuminance of the white light LED device affected by the amplitude of the driving waveform, b is the sinusoidal driving bias voltage of the white light LED device. φ1 is the first correlation coefficient between the illuminance and the bias voltage, ω1 is the second correlation coefficient between the illuminance and the bias voltage, is the third correlation coefficient between the illuminance and the bias voltage.

[0079] Under the driving gain condition, the illuminance output by the white light LED device, that is, the relationship between the illuminance and the gain coefficient, can be expressed as

[0080] P g = χ1g - μ1 (5)

[0081] where, P g is the illuminance of the white light LED device affected by the gain coefficient, g is the sinusoidal driving gain coefficient of the white light LED device, and χ1 and μ1 are the correlation coefficients between the illuminance and the gain coefficient.

[0082] It can be seen from this model that the frequency of the driving power supply has no effective impact on the illuminance of white light LEDs. As Figure 2 shown, when the driving wave frequency is small, the illuminance of the white light LED increases with the increase of the driving frequency, but the overall increment amplitude is less than 1%, so the influence of the frequency on the illuminance of the white light LED can be ignored. Although the magnitude of the driving frequency has no effective impact on the illuminance of the white light LED device, the light source stroboscopic caused by the driving frequency will seriously affect the lighting products of the white light LED device, so the influence of the driving frequency on the lighting effect of the white light LED device cannot be ignored.

[0083] Based on formula (1), the following three conclusions can be drawn: Point 1: The relationship between the driving frequency and the illuminance of the white LED has a linear relationship. Point 2: For a driving power supply with a given driving frequency, although the driving frequency and the illuminance of the white LED have a linear relationship, the change in the illuminance of the white LED device with frequency is small and negligible.

[0084] As shown in (1) and (2), the illuminance of the white LED device has a linear relationship with its driving frequency and amplitude respectively. A two-dimensional function between the illuminance of the white LED device and its driving frequency and amplitude can be established

[0085]

[0086] where P o is the illuminance of the white LED device when the driving frequency and waveform amplitude are (f0, v0) respectively. This formula can determine the illuminance of the white LED device under any driving frequency and sine waveform amplitude. There is currently no relevant report that can predict the illuminance of the white LED device under different driving frequencies and waveform amplitudes through a quantitative formula.

[0087] There is a relationship between the illuminance of the white LED device, the driving frequency of the driving power supply, the waveform amplitude, and the magnitude of the bias voltage. A three-dimensional function between the output illuminance of the white LED device and the driving frequency, waveform amplitude, and bias voltage can be established as follows:

[0088]

[0089] where P f is the illuminance output by the white LED device under the condition of changing driving frequency, P v is the illuminance output by the white LED device under the condition of changing the driving waveform amplitude, P b is the illuminance output by the white LED device under the condition of changing the driving bias voltage, and P1 is the illuminance of the white LED device under the condition of (f0, v0, b0).

[0090] Under the driving gain condition, the relationship between the illuminance output by the white LED device, that is, the illuminance and the gain coefficient, can be expressed as:

[0091] P g = χ1g - μ1 (8)

[0092] where χ1 is the first correlation coefficient between the illuminance and the gain coefficient, and μ1 is the second correlation coefficient between the illuminance and the gain coefficient.

[0093] Substituting formula (8) into (7), then

[0094]

[0095] The white light LED device can be used as an excitation light source. P2 is the illuminance of the white light LED device under the conditions of (f0, v0, b0, g0). Then, the illuminance of the sinusoidally driven white light LED can be expressed as:

[0096]

[0097] Among them, P f,v,b,g,t is the output illuminance of the white light LED device, P f is the illuminance of the white light LED device affected by the driving frequency, P v is the illuminance of the white light LED device affected by the driving waveform amplitude, P b is the illuminance of the white light LED device affected by the driving waveform amplitude, P g is the illuminance output by the white light LED device under the driving gain condition, P t is the illuminance of the white light LED device affected by the heat sink temperature, P o is the illuminance of the white light LED device when the driving frequency and waveform amplitude are (f0, v0) respectively. P1 is the illuminance of the white light LED device when the driving frequency, waveform amplitude, and sinusoidal driving bias voltage are (f0, v0, b0) respectively. P2 is the illuminance of the white light LED device when the driving frequency, waveform amplitude, sinusoidal driving bias voltage, and sinusoidal driving gain coefficient are (f0, v0, b0, g0) respectively. P3 is the illuminance of the white light LED device when the driving frequency, waveform amplitude, sinusoidal driving bias voltage, sinusoidal driving gain coefficient, and heat sink temperature are (f0, v0, b0, g0, t0) respectively. Based on formula (10), the following four conclusions can be obtained:

[0098] Point 1: The above model integrates the voltage amplitude, bias voltage, frequency, gain coefficient, heat sink temperature, and white light LED illuminance of the white light LED device, revealing the internal connection law of their mutual intersection. Through formula (10), the white light LED device under different driving parameter conditions can be accurately predicted, and the illuminance output by the white light LED device can be improved under different driving environments.

[0099] The illuminance P3 of the white LED device is 4855.67 lux under the conditions of (f0, v0, b0, g0, t0), the driving frequency f is 400 HZ, the waveform amplitude v is 4 V, the heat sink temperature t of the white LED device is 55 °C, the gain coefficient g is 4 dB, and the bias voltage b is 3 V. α1 is 0.0124, β1 is 4812.4, γ1 is 728.96, and δ1 is 927.07. When the driving waveform amplitude v changes from 2.5 V to 6.5 V, as Figure 3 shown, as the driving waveform amplitude increases, the illuminance of the white LED increases significantly. This is because an increase in the driving waveform amplitude will increase the load voltage across the white LED device, and as the load voltage increases, the power of the LED increases, enabling the white LED device to output a greater illuminance.

[0100] In formula (4), φ1 is 378.9, ω1 is 4727.7, is 5732.6. When the bias voltage changes from 2 V to 6 V, as Figure 4 shown, as the bias voltage increases, the illuminance output by the white LED device increases significantly. This indicates that the bias voltage of the driving waveform directly affects the illuminance output by the white LED device. When the bias voltage increases from 4 V to 5 V, the illuminance output by the white LED device reaches its conditional extreme value. As the bias voltage further increases, the increment of the illuminance output by the white LED device becomes smaller. Therefore, an appropriate bias voltage should be selected to maximize the illuminance output by the white LED device.

[0101] In formula (7), χ1 is 1659.6, μ1 is 1583. When the gain coefficient of the driving waveform changes from 2 dB to 6.5 dB, as Figure 5 shown, as the gain coefficient increases, the output illuminance of the white LED device increases significantly. This shows that the gain coefficient of the driving waveform directly causes changes in the illuminance of the white LED device. However, an overly large gain coefficient will cause distortion of the waveform driving the LED device, affecting its illumination effect. Therefore, the optimal gain coefficient should be selected to obtain an appropriate illuminance output by the white LED device.

[0102] In formula (3), σ1 is 0.1349, τ1 is 20.363, is 4166.6. When the heat sink temperature of the white LED device changes from 25 °C to 85 °C, as Figure 6As shown, as the temperature of the heat sink of the LED device increases, the illuminance of the white LED increases. When the temperature of the device heat sink is 65°C, the illuminance output by the white LED reaches a maximum value. As the heat sink temperature further increases, the illuminance of the white LED decreases instead. This shows that different heat sink temperatures will affect the illuminance output of the white LED device. Therefore, the optimal heat sink temperature should be selected to maximize the quantum efficiency inside the LED device, thereby obtaining the maximum illuminance output of the white LED device.

[0103] From the above analysis, as Figure 3 shown, by increasing the bias voltage of the white LED device, the illuminance output by the white LED can be effectively improved. However, when increasing the bias voltage of the white LED device, the droop effect will be caused, resulting in an increase in the temperature of the heat sink of the LED device. The fluctuation of the temperature of the heat sink of the white LED device, as Figure 6 shown, will show a non-linear relationship with the illuminance output of the white LED device. On the other hand, increasing the waveform amplitude of the white LED device will cause the load power of the LED device to increase, resulting in the aggregation effect of internal heat flow in the device, which will lead to a decrease in the luminous efficiency of the white LED device. Therefore, how to select appropriate voltage amplitude, bias voltage, frequency, and gain coefficient is the key factor for optimizing the design of the illuminance output of the white LED device.

[0104] The present invention reveals the dynamic cross-connection laws of sine wave driving characteristics (voltage amplitude, bias voltage, frequency, gain coefficient), heat sink temperature, and white LED illuminance from different levels. Using the sine wave driving characteristic parameters as a means through this multi-physical model has important guiding value for controlling the optical characteristics of white LEDs. It solves the problem of how to control the illuminance output of white LED devices through sine wave driving characteristic parameters during the design of the switching power supply drive for white LEDs. Through the present invention, engineers do not need to evaluate the influence laws of the sine wave driving characteristic parameters of the switching power supply drive on the optical characteristics of white LEDs after forming a complete white LED lighting system by loading the switching power supply drive load in the white LED lamp. Through this patent, engineers can evaluate the change laws of the sine wave driving characteristics (voltage amplitude, bias voltage, frequency, gain coefficient) in the optical characteristics of white LEDs through relevant characteristic parameters.

[0105] The present invention also provides a white LED device illuminance determination system corresponding to the white LED device illuminance determination method, including:

[0106] An acquisition module for acquiring the driving characteristics and heat sink temperature of the white LED device; the driving characteristics include voltage amplitude, bias voltage, frequency, and gain coefficient.

[0107] An output illuminance determination module, configured to determine the output illuminance of the white light LED device according to the driving characteristics and the heat sink temperature.

[0108] The present invention constructs a dynamic cross-relationship model of sine wave driving characteristics (voltage amplitude, bias voltage, frequency, gain coefficient), heat sink temperature, and white light LED illuminance: Since the illuminance of the white light LED device involves many physical factors, especially for white light LED devices driven by different characteristic driving parameters, its output optical characteristics depend on factors such as voltage amplitude, bias voltage, frequency, and gain coefficient. Therefore, there are complex multi-physical field cross-relationship laws in the change of the illuminance of the white light LED device. Before the assembly of the white light LED product, the driving circuit and the white light LED device are two independent modules. The current common method is to connect and combine the driving power supply part with the white light LED device to obtain the white light LED product, and take the white light LED device and the driving power supply as a whole research object to study the driving characteristics of the white light LED device and the characteristic parameters of the white light LED device. The present invention solves the internal relationship between the sine wave driving characteristic parameters studied independently and the illuminance of the white light LED device before the white light LED packaging. Engineers do not need to form a complete white light LED product by connecting the driving power supply part with the white light LED before evaluating the influence law of its characteristic parameters on the illuminance of the white light LED. Engineers can evaluate the change law of the optical characteristics of the white light LED after packaging through the characteristic parameters related to the sine drive characteristics.

[0109] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts among the various embodiments, reference can be made to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0110] Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for determining the illuminance of a white LED device, characterized in that, Including: Obtaining the driving characteristics and heat sink temperature of a white light LED device; The driving characteristics include voltage amplitude, bias voltage, frequency, and gain coefficient; Determining the output illuminance of the white light LED device according to the driving characteristics and the heat sink temperature; The expression for the output illuminance of the white light LED device is: Among them, P f,v,b,g,t is the output illuminance of the white light LED device, P f is the illuminance of the white light LED device affected by the driving frequency, P v is the illuminance of the white light LED device affected by the amplitude of the driving waveform, P b is the illuminance of the white light LED device affected by the amplitude of the driving waveform, P g is the illuminance output by the white light LED device under the driving gain condition, P t is the illuminance of the white light LED device affected by the heat sink temperature, P o is the illuminance of the white light LED device when the driving frequency and waveform amplitude are (f0 ， v0), P1 is the illuminance of the white light LED device when the driving frequency, waveform amplitude, and sine driving bias voltage are (f0 ， v0, b0), P2 is the illuminance of the white light LED device when the driving frequency, waveform amplitude, sine driving bias voltage, and sine driving gain coefficient are (f0 ， v0, b0, g0), P3 is the illuminance of the white light LED device when the driving frequency, waveform amplitude, sine driving bias voltage, sine driving gain coefficient, and heat sink temperature are (f0 ， v0, b0, g0, t0).

2. The method for determining the illuminance of the white LED device according to claim 1, characterized in that, The determining the output illuminance of the white light LED device according to the driving characteristics and the heat sink temperature specifically includes: Determining the relationship between illuminance and frequency according to the frequency; Determining the relationship between illuminance and voltage amplitude according to the voltage amplitude; Constructing a two-dimensional function between illuminance and frequency and voltage amplitude according to the relationship between illuminance and frequency and the relationship between illuminance and voltage amplitude; Determining the relationship between illuminance and bias voltage according to the bias voltage; Constructing a three-dimensional function between illuminance and frequency, voltage amplitude, and bias voltage according to the relationship between illuminance and frequency, the relationship between illuminance and voltage amplitude, and the relationship between illuminance and bias voltage; Determining the relationship between illuminance and the gain coefficient according to the gain coefficient; Determining the relationship between illuminance and the heat sink temperature according to the heat sink temperature; Determining the output illuminance of the white light LED device according to the two-dimensional function between illuminance and frequency and voltage amplitude, the three-dimensional function between illuminance and frequency, voltage amplitude, and bias voltage, the relationship between illuminance and the gain coefficient, and the relationship between illuminance and the heat sink temperature.

3. The method for determining the illuminance of the white light LED device according to claim 2, wherein, The expression for the relationship between illuminance and frequency is: P f = α1f + β1 Among them, P f is the illuminance of the white LED device affected by the driving frequency, f is the sinusoidal driving frequency of the white LED device, α1 is the first correlation coefficient between the illuminance and the frequency, and β1 is the second correlation coefficient between the illuminance and the frequency.

4. The method for determining the illuminance of the white LED device according to claim 2, wherein The expression for the relationship between illuminance and voltage amplitude is: P v = γ1v + δ1 Among them, P v is the illuminance of the white LED device affected by the amplitude of the driven waveform, v is the amplitude of the sinusoidal driving voltage of the white LED device, γ1 is the first correlation coefficient between the illuminance and the voltage amplitude, and δ1 is the second correlation coefficient between the illuminance and the voltage amplitude.

5. The method for determining the illuminance of the white LED device according to claim 2, wherein The expression for the relationship between illuminance and the heat sink temperature is: Among them, P t is the illuminance of the white light LED device affected by the heat sink temperature, t is the heat sink temperature at which the white light LED device is located, σ1 is the first correlation coefficient between the illuminance and the heat sink temperature, τ1 is the second correlation coefficient between the illuminance and the heat sink temperature, and is the third correlation coefficient between the illuminance and the heat sink temperature.

6. The method for determining the illuminance of the white LED device according to claim 2, wherein The expression for the relationship between illuminance and bias voltage is: Among them, P b is the illuminance of the white LED device affected by the amplitude of the driving waveform, b is the sinusoidal driving bias voltage of the white LED device, φ1 is the first correlation coefficient between the illuminance and the bias voltage, ω1 is the second correlation coefficient between the illuminance and the bias voltage, is the third correlation coefficient between the illuminance and the bias voltage.

7. The method for determining the illuminance of the white LED device according to claim 2, wherein The expression for the relationship between illuminance and the gain coefficient is: P g = χ1g - μ1 Among them, P g is the illuminance of the white light LED device affected by the gain coefficient, g is the sine drive gain coefficient of the white light LED device, χ1 is the first correlation coefficient between the illuminance and the gain coefficient, and μ1 is the second correlation coefficient between the illuminance and the gain coefficient.

8. A system for determining the illuminance of a white light LED device, characterized in that, Including: An obtaining module for obtaining the driving characteristics and heat sink temperature of a white light LED device; The driving characteristics include voltage amplitude, bias voltage, frequency, and gain coefficient; An output illuminance determining module for determining the output illuminance of the white light LED device according to the driving characteristics and the heat sink temperature; The expression for the output illuminance of the white light LED device is: Among them, P f,v,b,g,t is the output illuminance of the white light LED device, P f is the illuminance of the white light LED device affected by the driving frequency, P v is the illuminance of the white light LED device affected by the amplitude of the driving waveform, P b is the illuminance of the white light LED device affected by the amplitude of the driving waveform, P g is the illuminance output by the white light LED device under the driving gain condition, P t is the illuminance of the white light LED device affected by the heat sink temperature, P o is the illuminance of the white light LED device when the driving frequency and waveform amplitude are (f0 ， v0), respectively. P1 is the illuminance of the white light LED device when the driving frequency, waveform amplitude, and sine driving bias voltage are (f0 ， v0, b0), respectively. P2 is the illuminance of the white light LED device when the driving frequency, waveform amplitude, sine driving bias voltage, and sine driving gain coefficient are (f0 ， v0, b0, g0), respectively. P3 is the illuminance of the white light LED device when the driving frequency, waveform amplitude, sine driving bias voltage, sine driving gain coefficient, and heat sink temperature are (f0 ， v0, b0, g0, t0), respectively.

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