Apparatus and method of operation of a low-current LED lighting circuit

摘要

An apparatus and method of operation of a low-current LED lighting circuit are disclosed. The invention utilizes high AC voltage input and unreduced voltage ripple component of the rectified DC power signal, which provides the ability to drive an LED load at high power factor at low current. The invention discloses both active and passive circuits to limit the peak current flowing to the LED and create a current source for the LED load. The proposed circuit increases reliability by optionally eliminating capacitor, inductor, and heatsink components while minimizing luminous flux fluctuations.

主权项

1. An LED lighting circuit comprising:
a rectification circuit for converting an AC input power signal to a rectified DC power signal; a peak current limiting circuit electrically coupled to the rectification circuit for providing a peak current limiting means from the voltage ripple of said rectified DC power signal, wherein said voltage ripple is intentionally unreduced, whose output creates a current source; and an LED mesh circuit electrically coupled to the output of the peak current limiting circuit and receives said current source as an input; wherein the AC input power range is between 50 VRMS, inclusive, and 350 VRMS, inclusive, with a maximum of 20% of the AC input power allocated to the peak current limiting circuit, with said current source equal to or less than 20 mA per LED.