Title:
LED LIGHTING APPARATUS AND LED DRIVING CIRCUIT THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/021749
Kind Code:
A1
Abstract:
An LED lighting apparatus according to an embodiment of the present invention comprises: a rectifier for rectifying an alternating-current voltage that is input from an external power source, so as to generate a driving voltage; an LED light-emitting unit including a first LED group connected to a first node that is connected to an output terminal of the rectifier, and a plurality of LED groups connected to the first LED group in series; a switch unit controller which receives the driving voltage and generates a voltage value related to the external power source, and compares the generated voltage value with a pre-set reference voltage value and outputs a control signal; a switch unit connected between the first node and a second node that is located between the LED groups, wherein the turning on/off operation thereof is controlled by the control signal, thereby altering the connection relationships between the LED groups; and driving current controllers connected to the respective LED groups, for controlling the driving currents flowing in the respective LED groups to be constant currents.
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Inventors:
JUNG HYE MAN (KR)
Application Number:
PCT/KR2017/007697
Publication Date:
February 01, 2018
Filing Date:
July 18, 2017
Export Citation:
Assignee:
SEOUL SEMICONDUCTOR CO LTD (KR)
International Classes:
H05B44/00
Foreign References:
| KR20150017442A | 2015-02-17 | |||
| KR20120078999A | 2012-07-11 | |||
| KR20140102966A | 2014-08-25 | |||
| KR20150134251A | 2015-12-01 | |||
| KR20160007215A | 2016-01-20 |
Attorney, Agent or Firm:
PARK, Hae Chan (KR)
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