CN-122026713-A - Power factor correction method and system for LED power supply

CN122026713ACN 122026713 ACN122026713 ACN 122026713ACN-122026713-A

Abstract

The invention relates to the technical field of power electronics, and discloses a power factor correction method and a power factor correction system for an LED power supply. The method comprises the steps of constructing an analog-digital hybrid control circuit based on the memristor, utilizing nonvolatile resistance characteristics of the analog-digital hybrid control circuit to adjust PFC loop parameters in real time, collecting running state data and inputting the running state data into a control processor, optimizing memristor configuration by using a genetic algorithm and taking a power factor, a total harmonic distortion rate and efficiency as fitness functions, dynamically applying voltage pulses to accurately adjust the resistance of the memristor, and continuously self-adjusting based on closed-loop feedback. The system comprises a memristor programmable gain amplifier, a sensor, a control processor and a health monitoring module. According to the scheme, the hardware-level fast, fine and self-adaptive PFC parameter regulation and control is realized, and the stability of the power factor, the system efficiency and the long-term reliability are improved.

Inventors

WEI WEI
LI QIANG
HUANG LIE
BIAN HAOYU
XING YIBIN
ZHANG NAIJIU

Assignees

四川虹锐电工有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The power factor correction method of the LED power supply is characterized by comprising the following steps of: An analog-digital mixed control circuit based on memristors is constructed, a memristor array is used as a programmable resistor network to be embedded into a power factor correction control loop, and the analog-digital mixed control circuit is used for adjusting voltage loop gain, current loop gain and compensation network coefficients in real time; Acquiring power factor correction running state parameters, acquiring input voltage, input current, output voltage, output current and environmental temperature data through a sensor, converting all the data into digital signals and sending the digital signals to a control processor; Performing genetic algorithm optimization memristor configuration, and performing coding, selection, crossing and mutation operation on initial resistance distribution of a memristor array in a control processor by taking a power factor, a total harmonic distortion rate and system efficiency as fitness functions to generate an optimal resistance configuration scheme; Dynamically writing a memristor array, applying a voltage pulse sequence with specific amplitude and time sequence to the memristor array according to the optimal resistance configuration scheme, and accurately adjusting the resistance to a target value, so as to reconstruct parameters of a power factor correction control loop; and executing closed-loop feedback and continuous self-tuning, continuously monitoring a power factor correction performance index in the running process of the LED power supply, and triggering a new round of genetic algorithm optimization and memristor reconfiguration when the power factor reduction or the total harmonic distortion rate rise which are caused by the working condition change is detected to be larger than a preset threshold value.
2. The method for correcting the power factor of the LED power supply according to claim 1, wherein the memristor adopts a nano-scale film structure based on titanium dioxide or hafnium oxide, has multi-level resistance state storage capacity, the resistance value change range covers a preset interval, the response time is smaller than a preset time threshold, and the durability is larger than a preset cycle number.
3. The method of claim 2, wherein the analog-to-digital hybrid control circuit comprises an analog front end conditioning module, a memristor programmable gain amplifier, an analog-to-digital conversion interface, and a digital control logic unit, the memristor programmable gain amplifier being directly integrated in an error amplifier feedback path of the pfc controller for dynamically adjusting loop bandwidth and phase margin.
4. The method for power factor correction of an LED power supply of claim 3, wherein said sensor comprises an isolated voltage transformer, a hall current sensor and a digital temperature sensor, the sampling frequency is not less than a preset frequency threshold, the voltage measurement accuracy is within a preset error range, the current measurement accuracy is within a preset error range, and the temperature resolution is better than a preset temperature resolution threshold.
5. The method of power factor correction for an LED power supply of claim 4, wherein said genetic algorithm uses a real number coding scheme, each memristor unit corresponds to a gene, the gene value represents its target resistance, maps to a predetermined interval by normalization, and reverts to an actual physical resistance in proportion in the decoding stage.
6. The method of claim 5, wherein the fitness function of the genetic algorithm integrates three indexes of power factor, total harmonic distortion and system efficiency, and each index is distributed according to a preset weight to guide parameter setting to give consideration to energy efficiency optimization on the premise of meeting the power quality.
7. The method of claim 6, wherein the amplitude and pulse width of the voltage pulse sequence are determined according to the differential states of the target resistance and the current resistance, the application sequence is addressed by rows and columns according to the physical position of the memristor units in the array, the crosstalk effect is avoided, and the writing accuracy is controlled within a preset error range of the target resistance.
8. The method of claim 7, wherein the predetermined threshold comprises a power factor less than a predetermined power factor threshold or a total harmonic distortion greater than a predetermined distortion threshold, and the system immediately starts a self-tuning process once any one of the indices is out of limit, the entire optimization and reconfiguration period not being greater than a predetermined time threshold.
9. The method of claim 8, further comprising a memristor state health monitoring step of periodically detecting resistance drift and failure conditions of each memristor cell, shielding a certain cell from the available array when it is detected that the resistance deviation of the certain cell is greater than a preset deviation threshold or cannot respond to a write command, and automatically excluding the genetic participation of the cell in a genetic algorithm.
10. A power factor correction system for an LED power supply, comprising: The analog-digital hybrid control circuit based on the memristor comprises a memristor array serving as a programmable resistance network, is embedded in a power factor correction control loop and is used for adjusting voltage loop gain, current loop gain and compensation network coefficient in real time; The multi-source sensing acquisition unit is used for acquiring input voltage, input current, output voltage, output current and environmental temperature data; The control processor is used for executing a genetic algorithm, optimizing the resistance distribution of the memristor array by taking the power factor, the total harmonic distortion rate and the system efficiency as fitness functions, and generating an optimal resistance configuration scheme; the memristor array driving module is used for applying a voltage pulse sequence to the memristor array according to the optimal resistance configuration scheme so as to accurately adjust the resistance to a target value; the closed loop feedback and self-tuning module is used for continuously monitoring the power factor correction performance index in the running process of the LED power supply and triggering a new round of optimization and reconfiguration when the condition change is detected to cause the performance index to be out of limit.

Description

Power factor correction method and system for LED power supply Technical Field The invention belongs to the technical field of power electronics, and particularly relates to a power factor correction method and system of an LED power supply. Background In modern lighting and power electronics systems, the LED driving power source acts as a key energy conversion device, and its power quality directly affects grid stability and system energy efficiency. The Power Factor Correction (PFC) technology is widely used to improve the synchronicity of input current waveforms and voltages, so as to reduce harmonic pollution and meet international energy efficiency standards, and has become a core link in the design of high-performance LED power supplies. PFC control strategies typically rely on preset analog or digital control parameters, such as voltage loop, current loop gain, and compensation network coefficients, to achieve optimal regulation of the input power factor. However, in practical application, these parameters often need to be fine-tuned for different load conditions, input voltage fluctuation and environmental temperature variation, and the conventional method mostly adopts fixed parameters or digital potentiometers relying on manual intervention for tuning. The problems that the manual debugging process is time-consuming and difficult to cover the whole working condition range, so that the performance of the system is reduced under the nonstandard running condition are solved, and the conventional digital potentiometer has the problems of low response speed, coarse adjustment stepping, poor long-term stability and the like, and cannot support the PFC control requirement of high dynamic performance. Especially in the application scene of variable load or wide input voltage, the mismatch of control parameters is easy to cause current distortion, efficiency is reduced, even the system is unstable, and the intelligent and self-adaptive capacity of the LED power supply is severely restricted. Therefore, how to construct a hardware-level adaptive mechanism capable of sensing the working condition change in real time and autonomously optimizing the PFC control parameter becomes a technical problem to be solved currently. Disclosure of Invention The invention aims to provide a power factor correction method and a system for an LED power supply, which can effectively solve the problems in the background technology. In order to achieve the above object, the present invention provides a power factor correction method for an LED power supply, comprising the steps of: An analog-digital mixed control circuit based on memristors is constructed, a memristor array is used as a programmable resistor network to be embedded into a power factor correction control loop, and the analog-digital mixed control circuit is used for adjusting voltage loop gain, current loop gain and compensation network coefficients in real time; Acquiring power factor correction running state parameters, acquiring input voltage, input current, output voltage, output current and environmental temperature data through a sensor, converting all the data into digital signals and sending the digital signals to a control processor; Performing genetic algorithm optimization memristor configuration, and performing coding, selection, crossing and mutation operation on initial resistance distribution of a memristor array in a control processor by taking a power factor, a total harmonic distortion rate and system efficiency as fitness functions to generate an optimal resistance configuration scheme; Dynamically writing a memristor array, applying a voltage pulse sequence with specific amplitude and time sequence to the memristor array according to the optimal resistance configuration scheme, and accurately adjusting the resistance to a target value, so as to reconstruct parameters of a power factor correction control loop; and executing closed-loop feedback and continuous self-tuning, continuously monitoring a power factor correction performance index in the running process of the LED power supply, and triggering a new round of genetic algorithm optimization and memristor reconfiguration when the power factor reduction or the total harmonic distortion rate rise which are caused by the working condition change is detected to be larger than a preset threshold value. Preferably, the memristor adopts a nano-scale film structure based on titanium dioxide or hafnium oxide, has multi-level resistance state energy storage capacity, has a resistance value change range covering a preset interval, has response time smaller than a preset time threshold, and has durability larger than preset cycle times. Preferably, the analog-digital hybrid control circuit comprises an analog front end conditioning module, a memristor programmable gain amplifier, an analog-to-digital conversion interface and a digital control logic unit, wherein the memristor programmable gain amplifier