Light emitting diode (LED) luminous device directly driven in constant current by alternating current

A technology of constant current drive and lighting device, which is applied in the direction of electric light source, lighting device, lamp circuit layout, etc., to achieve the effect of prolonging service life, reducing power loss and small size
CN103200729AActive Publication Date: 2013-07-10四川能投智慧光电有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
四川能投智慧光电有限公司
Publication Date
2013-07-10

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Abstract

The invention relates to an alternating current direct constant current driving technology of a light emitting diode (LED) luminous device, discloses the LED luminous device directly driven in a constant current by an alternating current, and aims at the problem that the LED luminous device is directly driven by the alternating current in the prior art. The technical scheme includes that a parallel branch composed of n LED modules and a constant current unit connected in series is connected on the output end of a rectifying circuit, and cyclical flickering phenomenon caused by alternating voltage change can be avoided by setting current values, turn-off voltages and connecting voltages of branch constant current units. Because current of each branch is constant, LEDs in the LED modules can not cause current change because of change of junction temperature, and reliability is improved. Increasing of branch numbers enables a wave form of a driving current to approach a sine wave, and power factor and efficiency of the luminous device are improved through theory analysis.
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Description

technical field

[0001] The invention relates to an LED (light-emitting diode) light emitting device, in particular to an alternating current direct constant current driving technology of the LED light emitting device. 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, almost all existing LEDs are driven by direct current, but our production and living electricity is alternating current. Therefore, in currently used LED products, a power converter is needed to convert AC power into DC power. 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 service life of the lighting device; second, the power converter will reduce the efficiency of the lighting device; third, in low-power app...

Claims

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