CN-121985446-A - Intelligent power supply regulation and control method and system for LED (light-emitting diode) based on intelligent algorithm

CN121985446ACN 121985446 ACN121985446 ACN 121985446ACN-121985446-A

Abstract

The invention relates to the technical field of intelligent power supply regulation and control, and discloses an intelligent power supply regulation and control method and system for an LED (light-emitting diode) based on an intelligent algorithm. The method comprises the steps of collecting illumination state parameters of an LED and analyzing LED power requirements to obtain an optimal power predicted value, calculating switching frequency of a PFC circuit and PWM duty ratio of a DC-DC circuit according to the optimal power predicted value, using the switching frequency to adjust a power factor correction circuit to output direct current bus voltage, inputting the direct current bus voltage into the DC-DC circuit and using the PWM duty ratio to adjust LED driving current to generate an LED driving signal.

Inventors

SHANG WUMING
SHANG HUI
SUN CHANGGUI
DENG ZHENGDONG
LI JIANPING

Assignees

深圳市宇亮光电技术有限公司

Dates

Publication Date: 20260505
Application Date: 20260323

Claims (10)

1. An intelligent power supply regulation and control method of an LED based on an intelligent algorithm is characterized by comprising the following steps: collecting illumination state parameters of an LED and analyzing the power demand of the LED to obtain an optimal power predicted value; calculating the switching frequency of the PFC circuit and the PWM duty ratio of the DC-DC circuit according to the optimal power predicted value; Using the switching frequency to adjust a power factor correction circuit to output a direct current bus voltage; and inputting the direct current bus voltage into the DC-DC circuit and regulating the LED driving current by using the PWM duty ratio to generate an LED driving signal.
2. The intelligent power supply regulation and control method of an LED light emitting diode based on the intelligent algorithm according to claim 1, wherein the steps of collecting the illumination state parameters of the LED light emitting diode and analyzing the LED power demand to obtain an optimal power prediction value include: Detecting curvature change of the light extraction lens by using a laser displacement sensor array to obtain a lens bending radian, and detecting shrinkage displacement of the astigmatic reflection strip by using a Hall position sensor to obtain a reflection strip shrinkage ratio; detecting junction temperature change of an LED chip by using an NTC thermistor to obtain chip junction temperature data, and detecting light output intensity of the LED by using a silicon photodiode to obtain luminous flux data; Combining the lens bending radian, the reflection strip shrinkage ratio, the chip junction temperature data and the luminous flux data to obtain illumination state parameters; and carrying out LED power demand analysis based on the illumination state parameters to obtain an optimal power predicted value.
3. The intelligent power supply regulation method of an LED light emitting diode based on an intelligent algorithm according to claim 2, wherein the performing LED power demand analysis based on the illumination state parameter to obtain an optimal power prediction value comprises: Carrying out normalization processing and vector conversion on the lens bending radian, the reflection strip shrinkage ratio, the chip junction temperature data and the luminous flux data in the illumination state parameters to obtain a standard input vector; calculating Euclidean distance based on the standard input vector and a preset radial basis function center vector, and calculating the activation value of each radial basis function node by using a Gaussian kernel function to obtain an activation vector; performing matrix multiplication operation on the activation vector and the weight matrix to obtain an initial power predicted value and a predicted confidence coefficient of the LED power demand; and updating a radial basis function center vector and the weight matrix based on the initial power predicted value and the prediction confidence coefficient to obtain an optimal power predicted value.
4. The intelligent power supply regulation method of an LED light emitting diode based on an intelligent algorithm according to claim 3, wherein updating the radial basis function center vector and the weight matrix based on the initial power prediction value and the prediction confidence coefficient to obtain an optimal power prediction value comprises: performing difference calculation on the initial power predicted value and the actual LED power value, and performing weighting processing by combining the prediction confidence coefficient to obtain a weighted prediction error signal; calculating error gradients for each radial basis function node based on the weighted prediction error signals, and calculating weight gradients and center vector gradients by using a back propagation algorithm to obtain parameter updating gradient vectors; combining the parameter updating gradient vector with the self-adaptive learning rate and the momentum item to perform gradient descent updating of the weight matrix, so as to obtain an updated weight matrix; And recalculating the optimal position of the radial basis function center vector according to the updated weight matrix, and adjusting the center vector to obtain an optimal power predicted value.
5. The intelligent power supply regulation method of an LED light emitting diode based on an intelligent algorithm according to claim 1, wherein the calculating the switching frequency of the PFC circuit and the PWM duty cycle of the DC-DC circuit according to the optimal power prediction value includes: performing ratio operation and nonlinear mapping on the optimal power predicted value and rated power of the LED to obtain a PFC power regulation coefficient; Multiplying the PFC power adjustment coefficient with the reference switching frequency of the LED to obtain the switching frequency of the PFC circuit; Calculating the LED target current according to the optimal power predicted value, performing difference value operation with the nominal current, and performing nonlinear transformation through a hyperbolic tangent function to obtain a DC-DC current regulating quantity; And adding the DC-DC current regulating quantity and the reference duty ratio, and dynamically compensating by combining the lens bending radian and the reflective strip shrinkage ratio to obtain the PWM duty ratio of the DC-DC circuit.
6. The intelligent power supply regulation method of an LED light emitting diode based on an intelligent algorithm according to claim 1, wherein the adjusting the power factor correction circuit using the switching frequency, outputting a dc bus voltage, comprises: Inputting the switching frequency of the PFC circuit into a digital PWM controller for frequency setting, and driving a SiC MOSFET switching tube to perform switching action according to the switching frequency to obtain a PFC switching control signal; Detecting leakage inductance current of a PFC circuit through a current transformer based on the PFC switch control signal, and automatically adjusting the switching frequency based on the leakage inductance current to obtain an adjusted switching frequency; real-time adjusting the PFC inductance value according to the adjusted switching frequency to obtain a self-adaptive inductance parameter matched with the adjusted switching frequency; And performing PI control operation on the output voltage of the PFC circuit configured by the self-adaptive inductance parameter and the target bus voltage to obtain the DC bus voltage.
7. The intelligent power supply regulation method of an LED light emitting diode based on an intelligent algorithm according to claim 6, wherein the detecting the leakage current of the PFC circuit by a current transformer based on the PFC switching control signal, and automatically adjusting the switching frequency based on the leakage current, to obtain an adjusted switching frequency, comprises: Sampling and detecting leakage inductance current in a PFC circuit in real time through a current transformer based on the switching moment of the PFC switch control signal to obtain leakage inductance current at the switching-off moment of the switch; Calculating a zero-voltage switch minimum current threshold according to the output capacitance value, the maximum drain-source voltage and the dead time; Comparing the leakage inductance current at the switching-off moment of the switch with the zero-voltage switch minimum current threshold, and performing frequency-reducing calculation on the switching frequency of the PFC circuit when the leakage inductance current is smaller than the zero-voltage switch minimum current threshold to obtain the adjusted switching frequency.
8. The intelligent power regulation method of an LED light emitting diode based on an intelligent algorithm according to claim 1, wherein the inputting the DC bus voltage into the DC-DC circuit and adjusting an LED driving current using the PWM duty cycle, generating an LED driving signal, comprises: inputting the direct-current bus voltage into a DC-DC conversion circuit, and using a digital PWM generator to carry out switching control on a GaN HEMT switching tube according to the PWM duty ratio to obtain a DC-DC switching control signal; calculating an LED current predicted value at the next moment based on the DC-DC switch control signal, and performing deviation calculation on the LED current predicted value and an LED target current calculated according to the optimal power predicted value to obtain a current regulation deviation value; Performing temperature compensation on the forward voltage of the LED according to the current adjustment deviation amount and the junction temperature data of the LED chip to obtain a compensated forward voltage, and recalculating PWM duty cycle trimming amount by using the compensated forward voltage to obtain a target duty cycle parameter; And carrying out fuzzy control on the LED current and luminous flux data output by the DC-DC circuit configured by the target duty ratio parameter, and outputting an LED driving signal.
9. The intelligent power supply regulation and control method for an LED light emitting diode based on an intelligent algorithm according to claim 8, wherein the step of performing fuzzy control on the DC-DC circuit output LED current and luminous flux data configured by the target duty ratio parameter, and outputting an LED driving signal, comprises: Driving a DC-DC circuit to output LED current by using the target duty ratio parameter, detecting luminous flux data by a photoelectric converter, and performing subtraction operation on the luminous flux data and target luminous flux determined according to the lens bending radian and the reflective strip shrinkage ratio to obtain luminous flux control deviation and time change rate thereof; respectively inputting the luminous flux control deviation and the time change rate into a triangle membership function to carry out fuzzification quantization to obtain membership degrees corresponding to all fuzzy grades; Performing logic operation according to the membership degree to obtain a fuzzy reasoning result of the duty cycle fine adjustment quantity; and performing defuzzification calculation on the fuzzy reasoning result of the duty cycle fine adjustment quantity, performing accumulation operation on the fuzzy reasoning result and the target duty cycle parameter, and outputting an LED driving signal.
10. An intelligent power regulation system for an LED light emitting diode based on an intelligent algorithm, for performing the intelligent power regulation method for an LED light emitting diode based on an intelligent algorithm as set forth in any one of claims 1 to 9, comprising: The acquisition module is used for acquiring the illumination state parameters of the LED and analyzing the power demand of the LED to obtain an optimal power predicted value; The calculation module is used for calculating the switching frequency of the PFC circuit and the PWM duty ratio of the DC-DC circuit according to the optimal power predicted value; The output module is used for adjusting the power factor correction circuit by using the switching frequency and outputting the direct current bus voltage; And the adjusting module is used for inputting the direct current bus voltage into the DC-DC circuit and adjusting the LED driving current by using the PWM duty ratio to generate an LED driving signal.

Description

Intelligent power supply regulation and control method and system for LED (light-emitting diode) based on intelligent algorithm Technical Field The invention relates to the field of intelligent power supply regulation and control, in particular to an intelligent power supply regulation and control method and system for an LED based on an intelligent algorithm. Background When the traditional LED faces to complex optical changes such as radian adjustment of a light extraction lens, dynamic expansion of a light scattering reflection strip and the like in an LED searchlighting system, the traditional driving circuit cannot carry out self-adaptive adjustment according to the actual optical state. The adopted fixed control mode causes the problem that the power demand and the power supply output of the LED system are not matched in the dynamic adjustment process of the optical component, and when the curvature of the lens and the position of the reflecting strip are frequently changed, the phenomena of fluctuation of driving current and unstable light output are easily caused, so that the illumination quality and the energy efficiency level of the LED searchlighting system are seriously influenced. Disclosure of Invention The invention provides an intelligent power supply regulation and control method and system for an LED (light-emitting diode) based on an intelligent algorithm, which ensure that a circuit can maintain a zero-voltage switching state under different power requirements, effectively reduce switching loss and further ensure the stability and consistency of illumination output of the LED. In a first aspect, the present invention provides an intelligent power regulation method for an LED light emitting diode based on an intelligent algorithm, where the intelligent power regulation method for an LED light emitting diode based on an intelligent algorithm includes: collecting illumination state parameters of an LED and analyzing the power demand of the LED to obtain an optimal power predicted value; calculating the switching frequency of the PFC circuit and the PWM duty ratio of the DC-DC circuit according to the optimal power predicted value; Using the switching frequency to adjust a power factor correction circuit to output a direct current bus voltage; and inputting the direct current bus voltage into the DC-DC circuit and regulating the LED driving current by using the PWM duty ratio to generate an LED driving signal. With reference to the first aspect, in a first implementation manner of the first aspect of the present invention, the collecting the illumination state parameter of the LED light emitting diode and performing LED power demand analysis to obtain an optimal power prediction value includes: Detecting curvature change of the light extraction lens by using a laser displacement sensor array to obtain a lens bending radian, and detecting shrinkage displacement of the astigmatic reflection strip by using a Hall position sensor to obtain a reflection strip shrinkage ratio; detecting junction temperature change of an LED chip by using an NTC thermistor to obtain chip junction temperature data, and detecting light output intensity of the LED by using a silicon photodiode to obtain luminous flux data; Combining the lens bending radian, the reflection strip shrinkage ratio, the chip junction temperature data and the luminous flux data to obtain illumination state parameters; and carrying out LED power demand analysis based on the illumination state parameters to obtain an optimal power predicted value. With reference to the first aspect, in a second implementation manner of the first aspect of the present invention, the performing LED power demand analysis based on the lighting status parameter to obtain an optimal power prediction value includes: Carrying out normalization processing and vector conversion on the lens bending radian, the reflection strip shrinkage ratio, the chip junction temperature data and the luminous flux data in the illumination state parameters to obtain a standard input vector; calculating Euclidean distance based on the standard input vector and a preset radial basis function center vector, and calculating the activation value of each radial basis function node by using a Gaussian kernel function to obtain an activation vector; performing matrix multiplication operation on the activation vector and the weight matrix to obtain an initial power predicted value and a predicted confidence coefficient of the LED power demand; and updating a radial basis function center vector and the weight matrix based on the initial power predicted value and the prediction confidence coefficient to obtain an optimal power predicted value. With reference to the first aspect, in a third implementation manner of the first aspect of the present invention, updating the radial basis function center vector and the weight matrix based on the initial power predicted value and the prediction confidenc