US 8,552,656 B2 · AC light emitting device, driving device thereof, and driving method thereby

Abstract

An AC light emitting device, a driving device thereof and a driving method are disclosed. The driving device includes a sub-driving part turned on corresponding to each of positive and negative voltage regions of an AC voltage source to provide current paths for operating at least two LEDs, and a free-charge part charging with a voltage to be supplied to one of the at least two LEDs which is not operated while the other LED is operated by the sub-driving part. The AC light emitting device, the driving device thereof and the driving method thereby can solve problems, such as a decrease in power factor, severe total harmonic distortion, excessive flickering, and the like, due to operating characteristics of the AC light emitting device by application of an AC voltage source thereto.

Claims30

Dependent claims

A driving device for light emitting diodes (LEDs), comprising:

a free-charge part to be charged with a voltage to be supplied to a first LED of at least two LEDs, the first LED not being operated while a second LED of the at least two LEDs is operated by application of an alternating current (AC) voltage from an AC voltage source.

An alternating current (AC) light emitting device, comprising:

a light emitting part comprising at least two light emitting diodes (LEDs) operable by an AC voltage from an AC voltage source;
and
a driving part to drive the at least two LEDs upon application of the AC voltage, the driving part to be charged with a voltage to be supplied to a first LED of the at least two LEDs not being operated while a second LED of the at least two LEDs is operated.

Dependencies are inferred from the claim text.

AC light emitting device, driving device thereof, and driving method thereby

Life of this patent

AC light emitting device, driving device thereof, and driving method thereby

Life of this patent

Abstract

Claims30