Capacitor shunted LED light string

• US 8,324,820 B2
• Filed: 12/12/2008
• Issued: 12/04/2012
• Est. Priority Date: 11/24/2008
• Status: Expired due to Fees

• Current Assignee: JLJ, Inc.
• Original Assignee: JLJ, Inc.
• Inventors: Janning, John L.
• Primary Examiner(s): A, Minh D
• Application Number:
  US12/334,100
• Publication Number:
  US 20090091263A1
• Time in Patent Office: 1,453 Days
• Field of Search: 315121-123, 315/125, 315/127, 315/185.R, 315/185.S, 315/186, 315/192, 315/200.A, 362/568, 362/612, 362/565, 362/630, 362/555, 362/800
• US Class Current: 315/185.R
• CPC Class Codes: H05B 45/42 Antiparallel configurations

Abstract

A series connected LED light string using capacitors as shunts. The shunts are implemented by inserting a capacitor—for example a low breakdown voltage chip capacitor—in every light socket, or internally within each LED. The capacitive shunt continues current in the light string in the event an LED fails by opening electrically—the capacitor shorts out, thus, keeping the string of lights illuminated. The shunt capacitor across the LED also helps filter the pulsating DC voltage to the bulbs and reduces annoying flicker.

Claims

1. A series wired light string, comprising:

a plurality light emitting diodes (LEDs), connected to a source of 120 volts AC standard house current, each of the LEDs being contained in a respective housing; and

a plurality of low breakdown voltage capacitor shunts, each shunt being electrically connected in parallel across an LED and disposed within the respective housing of the LED, the capacitor shunt being subjected to full line voltage upon failure of the LED with which it is connected in parallel, causing the capacitor to breakdown and short out, thereby maintaining the current passing through the series wired light string in the event that the LED is inoperative, such that the remaining LED'"'"'s in the light string remain illuminated at substantially unchanged brightness, wherein each of said shunts comprises a capacitor with a breakdown voltage of approximately ten volts or more.

2. A series wired light string as recited in claim 1, further comprising a rectifier in series with said source of AC voltage to convert said AC voltage into pulsating DC voltage for powering said light string.