Seoul Semiconductor Co., Ltd.

Kwang Bea Lim

Sang Wook Han

Sung Ho Jin

Young Do Jong

Jae Young Choi

Jong Kook Lee

A driving circuit for a light emitting diode connected to a TRIAC dimmer configured to modulate an input AC voltage depending on a selected dimming level including a rectifier configured to full-wave rectify the modulated AC voltage output from the TRIAC dimmer to generate and output a driving voltage, a driving module configured to receive the driving voltage of the rectifier to detect the selected dimming level and drive a plurality of light emitting diode groups depending on the detected dimming level, and a bleeder circuit configured to provide a bleeder current to the TRIAC dimmer, in which the bleeder circuit is configured to provide the bleeder current only for a preset on-duty time.

Driving circuit and lighting apparatus for light emitting diode

A lighting apparatus including a light emitting diode connected to a dimmer configured to modulate an input AC voltage depending on a selected dimming level, a rectifier configured to full-wave rectify the modulated AC voltage output from the dimmer to generate and output a driving voltage, a driving module configured to receive the driving voltage of the rectifier to detect the selected dimming level, and select one of three driving modes of a stop mode, a resistance driving mode, and a sequential driving mode depending on the detected dimming level, and a plurality of light emitting diode groups configured to emit light depending on a control of the driving module.

Disclosed herein are a driving circuit and a lighting apparatus for a light emitting diode capable of improving a flicker, light efficiency, and electrical characteristics. The disclosed driving circuit for a light emitting diode includes: a dimmer modulating an AC voltage input depending on a selected dimming level; a rectifier full-wave rectifying the modulated AC voltage output from the dimmer to generate and output a driving voltage; and a driving module receiving the driving voltage of the rectifier to detect the selected dimming level and controlling a driving mode of a plurality of light emitting diode groups depending on the detected dimming level, in which the driving module selects one of a resistance driving mode driving all the plurality of light emitting diode groups and a sequential driving mode sequentially driving the plurality of light emitting diode groups to improve light efficiency and electrical characteristics.

A light-emitting diode (LED) lighting apparatus includes a rectification unit connected to an alternating current (AC) power source, and an LED light emitting module including m multi-cell LEDs each having n light emitting cells, klight emitting cells of the respective m multi-cell LEDs being connected to each other in series to form a klight emitting cell group, n being a positive integer of 2 or greater, m being a positive integer of 1 or greater, and k being a positive integer from 1 to n. The rectification unit is configured to supply a rectified voltage to the LED light emitting module through full-wave rectification of an AC voltage from the AC power source. The LED light emitting module is configured to emit light upon receiving the rectified voltage from the rectification unit, and to control sequential driving of first to nlight emitting cell groups according to a voltage level of the rectified voltage.

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Ansan-si, South Korea

Kwang Bea Lim