LED lighting string employing rectified and filtered device

• US 20080157686A1
• Filed: 12/29/2006
• Published: 07/03/2008
• Est. Priority Date: 12/29/2006
• Status: Active Grant

• Current Assignee: Excellence Opto. Inc (Excellence Optoelectronics Inc.)
• Original Assignee: Excellence Opto. Inc (Excellence Optoelectronics Inc.)
• Inventors: Liu, Chun-Hsien, Chung, Wen-Chen, Liu, Tung-Lung
• Granted Patent: US 7,501,772 B2
• Time in Patent Office: Days
• US Class Current: 315/185S
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: H05B 45/355 Power factor correction [PFC]; Reactive power compensation
• CPC Class Codes: H05B 45/59 for reducing or suppressing flicker or glow effects

Abstract

An improved LED lighting string employs a rectified and filtered device functioned as a low pass filter device to rectify input AC source into DC source providing to the LED lighting string for improving LED'"'"'s flickering issue and to upgrade the optical power factor and efficiency, and luminous intensity in LED lighting string.

Claims

1. An improved LED lighting string for improving LED'"'"'s flickering issue comprises an electrical wire integrating with a plug to get an AC source and one or more loops of LED lighting strings in parallel circuit each with a predetermined number of LED lamps for lighting with single or multiple colors, wherein each loops or at least one loops of LED lighting strings has a rectified and filtered device integrated a diode D1, a resistor R1 and a capacitor C1 as a low pass filter device and coupled to the plug to rectify input AC source into DC source providing to whose loop of LED lighting string has one corresponding rectified and filtered device.

2. The improved LED lighting string as defined in claim 1, wherein each loops or at least one loop of LED lighting strings further has one or more safe LED bulbs as a current-limiting device.

3. The improved LED lighting string as defined in claim 1, wherein at least one loop of LED lighting strings has an end connector used as a device connecting the other loop of LED lighting string and a rectified and filtered device coupled in series circuit to the end connector for providing a DC source.

4. The improved LED lighting string as defined in claim 3, wherein each loops or at least one loop of LED lighting strings further has one or more safe LED bulbs as a current-limiting device.