Dimming drive circuit of AC (Alternating Current) direct drive LED module

A technology of dimming drive and LED light source, applied in the direction of electric lamp circuit layout, electric light source, electroluminescent light source, etc. Effect

CN102892238BActive Publication Date: 2015-02-04四川能投智慧光电有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-02-04

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Abstract

Disclosed is an alternating current dimming drive circuit for an LED, comprising a rectification unit and N stages of LED direct current drive circuits. In the ith stage of LED direct current drive circuit, a first end of the ith voltage sampling unit and an input end of the ith LED light source module directly or indirectly receive the output voltage of the rectification unit; a voltage division end of the ith voltage sampling unit is connected to a second input end of the ith switch unit; and a first input end of the ith switch unit is connected to an output end of the ith LED light source module, and an output end of the ith switch unit, a second end of the ith voltage sampling unit and a second output end of the rectification unit are grounded. When the ith switch unit is switched on, the first to the ith LED light source modules emit light. When the ith switch unit is switched off, if i is less than N, the first to the (i + 1)th LED light source modules emit light, and if i is equal to N, the first to the Nth LED light source modules stop emitting light. The present invention realizes an alternating current directly-driven LED light source module and will not flicker in the case of alternating current voltage fluctuation.
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Description

technical field

[0001] The present invention generally relates to a driving circuit for LED light source modules, in particular to a circuit for directly driving LED light source modules with alternating current, especially to an LED dimming driving circuit compatible with thyristor dimmers . Background technique

[0002] As a new type of solid-state light source, LED is expected to become a new generation of lighting source due to its advantages of energy saving, environmental protection and long life. As we all know, LED is driven by DC voltage, but our production and living electricity is AC cycle power. Therefore, in order to light up the LED normally, a power converter is needed to realize the functions of rectification and step-down. The introduction of power converters brings many negative effects. First, the life of the power converter is much lower than the life of the LED itself, which shortens the life of the light-emitting device; second, the power converter w...

Examples

Embodiment Construction

[0058] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many of the details listed in the specification are only for readers to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0059] figure 1 A schematic diagram showing the principle of an AC dimming drive circuit for LEDs according to an embodiment of the present invention. Such as figure 1 As shown, the AC dimming driving circuit includes a rectifying unit 12 , a first voltage sampling unit 14 , a first switching unit 16 and a first LED light source module 18 . The rectification unit 12 includes four diodes, and the four diodes form a bridge rectification circuit. Alternatively, t...