LED drive circuit and LED illumination system

Abstract

The invention discloses an LED drive circuit and an LED illumination system, and the LED illumination system comprises a power supply. The LED drive circuit comprises an inductor, a switching tube, a first capacitor, a second capacitor, a first diode, and a second diode. The first end of the inductor is connected with the first end of the power supply, and the second end of the inductor is connected with the first end of the switching tube and the first end of the first capacitor. The second end of the switching tube is connected with the second end of the power supply, and the second end of the first capacitor is connected with the anode of the first diode and the cathode of the second diode. The cathode of the first diode is connected with the anode of a first LED module group, and the anode of the second diode is connected with the cathode of a second LED module group. The cathode of the first LED module group is connected with the anode of the second LED module group, and the common end of the first LED module group is connected with the first end of the second capacitor. The second end of the second capacitor is connected with the second end of the power supply. The circuit is simple in structure, is low in cost, is easy to develop and facilitates the market promotion.

Description

technical field [0001] The invention relates to the technical field of LED driving, in particular to an LED driving circuit and an LED lighting system. Background technique [0002] Due to its advantages of high efficiency and long life, LED lighting system has become the main product in the current lighting market and display market. Due to the limitation of its thermal management and other factors, the luminous ability of a single LED monomer is limited. Therefore, multiple LED monomers are usually connected in series to meet the actual brightness requirements. In order to ensure that each monomer emits the same brightness, the LED drive circuit needs to have the function of ensuring the consistency of the current of all LED monomers. [0003] The simplest current sharing solution in the prior art is to connect all LED monomers in series to share a current, but this will greatly reduce the reliability of the system. Another popular solution is to divide all the monomers ...

AI Technical Summary

Problems solved by technology

At present, most of the driving circuits based on this scheme are based on the half-bridge or full-bridge structure, which makes the structure of the driving circuit complex, costly and difficult to develop

[0004] In addition, from the perspective of safety, the LED lighting system needs to have the function of isolation of input and output. In the prior art, an isolation transformer is usually installed between the input and output. Although the purpose of isolation can be achieved, the heavy transformer increases the driving circuit size and limits its design

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