LED lighting Cuk-LLC three-port circuit and fuzzy prediction method

Abstract

The invention relates to an LED lighting Cuk-LLC three-port circuit and a fuzzy prediction method. The LED lighting Cuk-LLC three-port circuit comprises a photovoltaic power generation power supply V1, an input DC power supply V2, an inductor L1, an inductor L2, a resonant inductor Lr, a power MOS transistor S1, a power MOS transistor S2, an intermediate capacitor CB, a resonant capacitor Cr, an output capacitor C0, a transformer T (including a primary winding and a secondary winding), a power diode D1, a power diode D2, a power diode D3, a power diode D4 and an LED load V0. The circuit realizes soft switching three-port conversion circuit and battery energy storage management by combining a bidirectional Cuk circuit and a half-bridge LLC resonant circuit. Meanwhile, the duty cycle increment of the converter is predicted by adopting a fuzzy prediction algorithm through sampling battery voltage and power supply voltage signals so as to improve the dynamic response performance and control accuracy of the circuit.

Description

technical field [0001] The invention relates to a Cuk-LLC three-port circuit for LED lighting and its fuzzy prediction method, which is applied to a distributed power supply system input by various energy sources. Switch three-port conversion circuit and battery energy storage management, using fuzzy prediction method to control battery charge and discharge, by detecting input DC power supply voltage and photovoltaic power supply voltage, using fuzzy prediction method to estimate output duty cycle increment Δd, to achieve excellent battery management features. Background technique [0002] At present, multi-energy generation has led to the widespread application of multi-port converters. Multi-port converters can realize multiple energy inputs, combine distributed energy sources and necessary energy storage equipment, realize comprehensive control and unified management of power generation, energy storage, and power consumption processes, and realize energy transfer between...

AI Technical Summary

Problems solved by technology

Nowadays, many types of multi-port converters have been proposed, such as multi-input converters based on forward and flyback converters, but the input current of this circuit is discontinuous, which is difficult to apply in high-power circuits; and the use of voltage source full The bridge or half bridge constitutes a multi-input converter topology. The direction of energy flow is controlled by controlling the phase difference of the square waves on both sides of the transformer to achieve the purpose of power supply or energy storage. This type of converter can be soft-switched under certain load conditions. The form of operation, to achieve higher efficiency, but the system hardware peripherals are too complex

In terms of existing battery charge and discharge control technologies, constant voltage and constant current control are relatively mature, but both methods require precise mathematical models, and have the limitations of slow dynamic response and insufficient control accuracy.

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