Self-adaption LED lamp

Abstract

The invention discloses a self-adaption LED lamp. The lamp comprises a direct current power supply, a first LED component, a second LED component, a first current control switch, a second current control switch, a first polar tube and a second polar tube. The first LED component comprises a first LED lamp, a first constant current circuit and a first electrolytic capacitor; the second LED component comprises a second LED lamp, a second constant current circuit and a second electrolytic capacitor; an input end of the first LED component is respectively connected with a positive input end of thedirect current power supply and one end of the first current control switch, and positive poles of the first polar tube and second polar tube are respectively connected with an output end of the first LED component and one end of the second current control switch; negative poles of the first polar tube and second polar tube are respectively connected with the other end of the first current control switch and an input end of the second LED component, and the other end of the second current control switch is respectively connected with an output end of the second LED component and a negative output end of the direct current power. The LED lamp has the advantages that the luminescene is constantly stable, the stroboflash can not appear, the power factor is high, and the harmonic distortionis small.

Description

technical field [0001] The invention relates to the field of LEDs, in particular to an adaptive LED lamp. Background technique [0002] At present, LED lights are usually driven by a switching power supply, and the mains power is converted into low-voltage direct current by a high-frequency switching power supply to drive the LED to emit light. The LED circuit driven by switching power supply is complex, with many components, high cost, low reliability and large volume. The introduction of high-frequency switching power supply will not only produce electromagnetic interference, but also directly affect the service life of the LED lamp, because many LED lamp failures are caused by power failure. [0003] In order to solve the above problems, a linear constant current LED lamp circuit without switching power supply has appeared. The voltage of a single LED is generally about 3.2V, which is far lower than the mains voltage. Therefore, multiple LEDs are connected in series to ...

AI Technical Summary

Problems solved by technology

When the input voltage is less than Vd, the LED is in the off state and does not emit light, and when it is greater than Vd, the LED turns on and emits light. However, in this circuit, the LED operating voltage fluctuates and the operating current is discontinuous. The current opening angle is small, and the LED flickers frequently. Obviously, the electrical efficiency is low, the harmonic distortion is large, and the performance index is not high

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