LED driving circuit for continuously driving LED, LED lighting device comprising same and driving method

摘要

An exemplary embodiment discloses a light-emitting diode (LED) driving circuit including an LED driving module configured to provide a first driving voltage to an LED light emitting module including a first LED group to an n-th LED group, n is an integer which is equal to or larger than 2, and sequentially drive the first LED group to the n-th LED group depending on a voltage level of the first driving voltage and a second driving voltage providing module configured to store some of the first driving voltage and selectively provide a second driving voltage to some of the LED groups other than at least the first LED group to an m-th LED group among the LED groups in a Vfm compensation section, 1≦m≦n−1, according to a control of the LED driving module.

主权项

1. A light-emitting diode (LED) driving circuit comprising:
an LED driving module configured to:
provide a first driving voltage to an LED light emitting module comprising a first LED group to an n-th LED group, wherein n being an integer which is equal to or larger than 2, andsequentially drive the first LED group to the n-th LED group depending on a voltage level of the first driving voltage; and a second driving voltage providing module configured to:
store some of the first driving voltage; andselectively provide a second driving voltage to some LED groups other than at least the first LED group to an m-th LED group among the LED groups in a (Vfm) compensation section, wherein 1≦m≦n−1, according to a control of the LED driving module, wherein the LED driving module is configured to:
detect an operating state of the m-th LED group and when the m-th LED group is not normally operated,determine that the m-th LED group enters the (Vfm) compensation section, andfurther determine that the m-th LED group is separated from the (Vfm) compensation section when the m-th LED group is normally operated again, and wherein the first driving voltage has a voltage value that changes over time with a minimum voltage value that is less than or equal to (Vf1) and a maximum voltage value that is greater than or equal to (Vfn).