LED lighting string employing rectified and filtered device

• US 7,501,772 B2
• Filed: 12/29/2006
• Issued: 03/10/2009
• Est. Priority Date: 12/29/2006
• Status: Expired due to Fees

• Current Assignee: Excellence Opto. Inc (Excellence Optoelectronics Inc.)
• Original Assignee: Excellence Opto. Inc (Excellence Optoelectronics Inc.)
• Inventors: Liu, Tung-Lung, Liu, Chun-Hsien, Chung, Wen-Chen
• Primary Examiner(s): Philogene; Haissa
• Application Number:
  US11/647,338
• Publication Number:
  US 20080157686A1
• Time in Patent Office: 802 Days
• Field of Search: 315/185.R, 315/185.S, 315/187, 315/192, 315/205, 315/246, 315/312, 315/200.R, 362/543, 362/545, 362/612, 362/653, 362/654, 362/800, 362/806
• US Class Current: 315/185.00R
• 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 designed to improve LED'"'"'s flickering problems, comprises an electrical wire and one or more loops of LED lighting strings in parallel circuit integrated with a plug to connect with an AC source, and an end connector used for connecting the other loop of LED lighting string, wherein each loop or multiple loops of LED lighting strings has/have a half-wave rectified and filtered device integrated with a diode D1, a resistor R1 and a capacitor C1 as a low pass filter device and coupled to the plug to rectify the inputted AC source into a DC source.

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