Linear power supply based on segmented dimming of LED lamp groups

Abstract

The invention discloses a linear power supply based on the segmented dimming of LED lamp groups. The linear power supply comprises an alternating current power supply, a rectifying circuit, a segmented dimming integrated chip and multiple segments of LED lamp groups electrically connected in series arranged on an integrated lamp board, each segment of LED lamp groups comprises a plurality of LED lamp beads connected in series, third and fourth pins of the rectifying circuit are connected to first and second pins of the segmented dimming integrated chip, a negative electrode of a first segmentof the LED lamp group is connected to a first segment of switch pin of the segmented dimming integrated chip and a positive electrode of a second segment of the LED lamp group, a negative electrode ofa previous segment of the LED lamp group is connected to a last segment of switch pin of the segmented dimming integrated chip and a positive electrode of a latter segment of the LED lamp group, a negative electrode of a last segment of the LED lamp group is connected to a corresponding segment of switch pin of the segmented dimming integrated chip, and the number of LED lamp beads included in the latter segment of the LED lamp group is smaller than the number of LED lamp beads included in the previous segment of LED lamp group. According to the linear power supply, the dimming shape effect and light effect can be improved.

Description

technical field [0001] The invention relates to the field of LED modules, in particular to a linear power supply based on segmental dimming of LED lamp groups. Background technique [0002] In the existing popular thyristor dimming power supply drive scheme circuit, the linear power supply, especially the dimmable segmented linear power supply drive scheme introduced by the chip company later, has simple circuits, fewer components, low cost, and full production. It is very popular in the LED dimming market due to the advantages of SMD technology, easy realization of lamp bead circuit integration, low production pass rate and defect rate; but affected by technical limitations, although the linear power supply has implemented multi-stage conduction technology to Improve the power conversion efficiency / LED light efficiency, but the light effect still cannot meet the actual lighting use. At the same time, the current segmental dimming technology seriously affects the dimming eff...

AI Technical Summary

Problems solved by technology

[0002] In the existing popular thyristor dimming power supply drive scheme circuit, the linear power supply, especially the dimmable segmented linear power supply drive scheme introduced by the chip company later, has simple circuits, fewer components, low cost, and full production. It is very popular in the LED dimming market due to the advantages of SMD technology, easy realization of lamp bead circuit integration, low production pass rate and defect rate; but affected by technical limitations, although the linear power supply has implemented multi-stage conduction technology to Improve the power conversion efficiency / LED light efficiency, but the light effect still cannot meet the actual lighting use. At the same time, the current segmental dimming technology seriously affects the dimming effect due to the unreasonable layout of LEDs in each segment.

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