Wide input range outdoor optical recording LED high power density conversion method

Abstract

The invention discloses a wide input range outdoor optical recording LED high power density conversion method. A charging part having an MPPT function and an LED constant current driving part are provided. By deeply analyzing basic characteristics of a solar cell, a storage battery, and an LED, a bidirectional synchronous rectification DC-DC converter having a main topology based on a Buck-Boost type is designed. During the forward operation of the DC-DC converter, a charging circuit adopts a Buck type topological structure, and is used to charge the storage battery by using an MPPT, constant voltage, constant current combination three-phase charging method. During the backward operation of the DC-DC converter, a discharging circuit adopts a Boost type topological structure, the constant voltage output of the LED lamp is realized, and a PWM dimming function is provided. By adopting an improved control method based on a conventional perturbation observation method, and according to the I-V characteristic of the solar cell, an increment of each time is converted into the step size of the next time actually approaching a control voltage, and therefore overcontrol is prevented, and frequency perturbation is reduced during a steady state of a component.

Description

A wide-range input outdoor light-storage LED high power density conversion method technical field The invention relates to the technical field of solar LED lighting, in particular to a wide range input outdoor light storage LED high power density conversion method. Background technique The perturbation and observation method is one of the most commonly used MPPT algorithms at present. Its working process is to periodically perturb the output voltage (V+ V) of the solar cell, and then compare it with the output power before the perturbation. If the power value is increasing, it means The disturbance direction is consistent with the control direction, and continues to change in the same direction (+V); if the power value is decreasing instead, it changes in the opposite direction (-V), so that repeated disturbances will output their maximum power value. The perturbation and observation method is to change its voltage value at regular intervals, and the next step of the cont...

AI Technical Summary

Problems solved by technology

If U is too large, there will be particularly serious oscillations around the maximum power point, and there will be a large power loss; great inconvenience

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