Method for driving LED with the use of alternating current

Abstract

The invention belongs to the field of LED lamps and relates to a method for driving an LED with the use of alternating current. The method is characterized in that an LED light emitting body is driven by making use of at least two different phases of current of alternating current. The stroboscopic problem in the process of driving an LED with the use of alternating current is solved; compared with the direct-current drive technology, the advantages of high reliability, high efficiency, small size, low additional power consumption, long service life, low manufacture cost, low use cost and the like are achieved as a special driving power supply is omitted; and compared with the prior alternating-current drive technology, the advantages of high reliability, high efficiency, small size, low additional power consumption, long service life, low manufacture cost, low use cost and the like are achieved as a current limiting resistor, a step-down capacitor and a choke inductor are omitted. The method is an LED driving method with obvious economic and social benefits and high cost performance.

Description

technical field [0001] The invention belongs to the field of LED lamps and relates to a method for driving LEDs with alternating current. Background technique [0002] LED lamps are attracting attention due to their advantages of energy saving, durability and environmental protection, and are being promoted and applied as a new generation of light sources. As for the traditional DC LED light emitting device, due to the need of a DC power source, the manufacturing cost is high, the service life of the lamp is affected, and the redundant energy consumption of the power source is required. Existing AC LED lighting devices have the problem of flickering. At the same time, the current limiting resistors, step-down capacitors and choke inductors connected in series in the circuit have the problems of additional energy consumption and increased manufacturing cost and volume of LED lamps. Patents CN201902900U and CN102468413A propose a method using long-lasting fluorescent substanc...

AI Technical Summary

Problems solved by technology

However, since the luminous intensity of long-lasting phosphors exhibits an exponential decay characteristic in the absence of excitation light, long-lasting phosphors can only partially reduce flickering, but cannot eliminate the flickering problem, especially in the LED chip. The luminous flux is kept constant during the 7 millisecond interval when the LED chip is not emitting light, and there is no guarantee that there will be no no-light gap during the 7 millisecond interval when the LED chip is not emitting light

In addition, the low luminous efficiency of long afterglow phosphors will reduce the luminous efficiency of LED lamps

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