US 2026/0156729 A1 · LED Luminaire with Reduced Visible Flicker

Abstract

A lighting circuit for solid-state lighting, such as light-emitting diodes (LEDs), is configured to produce reduced visible flicker. The lighting circuit may accept time-varying input power, such as alternating current (AC) power or rectified AC power. Within the circuit, a plurality of LED light engines are grouped in sets. Some of the sets receive unaltered input power, while other sets receive input power that has been shifted in phase. The phases of the sets of LED light engines are coordinated such that, at any time during the power cycle, at least one set of LED light engines is illuminated, and the lighting circuit as a whole produces a substantially constant luminous flux over the entire power cycle. LED light engines from different sets may be grouped or clustered together on a printed circuit board such that, in the aggregate, they do not produce the illusion of movement during illumination.

Claims20

Dependent claims

A lighting circuit, comprising:

a printed circuit board (PCB);
a plurality of sets of LED light engines disposed on the PCB, each of the plurality of sets of LED light engines configured to receive AC power and to emit light during a different portion of a single AC power cycle;
wherein some of the plurality of sets of LED light engines receive phase-shifted AC power;
and
wherein the different portions are coordinated such that the lighting circuit has a substantially constant luminous flux throughout the single AC power cycle.

2 more elements

A lighting circuit, comprising:

at least one phase-shifting component having an electrical reactance;
a printed circuit board (PCB);
an AC power input line on the printed circuit board, the AC power input line configured to receive AC power;
a phase-shifted AC power input line configured to receive phase-shifted AC power from the at least one phase-shifting component;
a neural line;
a first set of LED light engines disposed on the PCB and connected to the AC power input line and the neutral line;
a second set of LED light engines disposed on the PCB and connected to the AC power input line and the neutral line;
a third set of LED light engines disposed on the PCB and connected to the phase-shifted AC power input line and the neutral line;
a fourth set of LED light engines disposed on the PCB and connected to the phase-shifted AC power input line and the neutral line;
a first diode connected between the AC power input line and the first set of LED light engines, the first diode and the first set of LED light engines arranged such that the first set of LED light engines is forward-biased during a positive half-cycle of the AC power;
a second diode connected between the AC power input line and the second set of LED light engines, the second diode and the second set of LED light engines arranged such that the second set of LED light engines is forward-biased during a negative half-cycle of the AC power;
a third diode connected between the phase-shifted AC power input line and the third set of LED light engines, the third diode and the third set of LED light engines arranged such that the third set of LED light engines is forward-biased during a positive half-cycle of the phase-shifted AC power;
and
a fourth diode connected between the phase-shifted AC power input line and the fourth set of LED light engines, the fourth diode and the fourth set of LED light engines arranged such that the fourth set of LED light engines is forward-biased during a negative half-cycle of the phase-shifted AC power.

11 more elements

Dependencies are inferred from the claim text.

LED Luminaire with Reduced Visible Flicker

Life of this patent

LED Luminaire with Reduced Visible Flicker

Life of this patent

Abstract

Claims20