SCC-based independent dimming multi-path light emitting diode (LED) driving circuit capable of current sharing

A technology of LED drive and independent dimming, which is applied in the direction of light source, electric light source, electrical components, etc., can solve the problems of high cost of current sharing accuracy, poor device balance characteristics, etc., and achieve low switching loss, low cost, simple and effective dimming Effect

CN105530724AActive Publication Date: 2016-04-27SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-04-27

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Abstract

The invention discloses an SCC-based independent dimming multi-path light emitting diode (LED) driving circuit capable of current sharing. The SCC-based independent dimming multi-path LED driving circuit comprises a half-bridge inversion unit X, a front-stage LLC resonant conversion network unit Y, a multi-path LED current-sharing driving unit Z1 and a multi-path LED current-sharing driving unit Z2 which are connected with one another, the multi-path LED current-sharing driving unit Z1 is controlled by a first controllable switch capacitor, the multi-path LED current-sharing driving unit Z2 is controlled by a second controllable switch capacitor, the multi-path LED current-sharing driving unit Z1 controlled by the first controllable switch capacitor is provided with a first current-sharing controllable switch capacitor SCC1, and the multi-path LED current-sharing driving unit Z2 controlled by the second controllable switch capacitor is provided with a second current-sharing controllable switch capacitor SCC2. The SCC-based independent dimming multi-path LED driving circuit has the characteristics of simplicity in structure, low cost, high practicability and the like, is easy to implement, and is easily expanded to an 2n-path application occasion.
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Description

technical field

[0001] The present invention relates to a multi-channel LED current sharing and dimming technology, in particular to an SCC-based independent dimming multi-channel LED drive circuit with current sharing. Multi-channel LED driver circuit with independent dimming. Background technique

[0002] LED light sources have the characteristics of high luminous efficiency and long life, so they are widely used in household, commercial and industrial fields. At present, the single-chip package power of most LED light sources on the market is 1-3W, because it is difficult to solve the heat dissipation problem of high-power single-chip package. Therefore, in most lighting occasions, such as LCD backlight, street lamps and general lighting, etc., it is necessary to use multiple LED light sources at the same time to meet the lighting intensity requirements, and when multiple LED light sources work at the same time, the brightness must be uniform. The output light spectrum ...

Examples

Embodiment

[0029] Such as figure 1 As shown, it is a SCC-based independent dimming multi-channel LED drive circuit based on SCC according to the present invention, including: a half-bridge inverter unit X connected to each other, a front-stage LLC resonant conversion network unit Y and a first adjustable Multi-channel LED current sharing drive unit Z controlled by the switch capacitor 1 and the second controllable switched capacitor controlled multi-channel LED current sharing drive unit Z 2 ; The multi-channel LED current equalization drive unit Z controlled by the first controllable switched capacitor 1 With the first current-sharing controllable switched capacitor SCC 1 ; The second controllable switched capacitor controlled multi-channel LED current equalization drive unit Z 2 With a second current-sharing controllable switched capacitor SCC 2 ;

[0030] The half-bridge inverter unit X includes: a first switch MOS transistor Q 1 , the second switch MOS tube Q 2 , the first cap...