DRIVE CIRCUIT FOR A LIGHT-EMMITTING DIODE LIGHT SOURCE

MX434142BActive Publication Date: 2026-05-19LUTRON TECHNOLOGY COMPANY LLC
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Patent Information

Authority / Receiving Office
MX · MX
Patent Type
Patents
Current Assignee / Owner
LUTRON TECHNOLOGY COMPANY LLC
Filing Date
2021-02-25
Publication Date
2026-05-19

AI Technical Summary

Technical Problem

Existing LED light source control technologies face challenges in efficiently regulating current and voltage to achieve precise intensity and color control, particularly in dimming applications, which can lead to erroneous operation and inefficient power management.

Method used

A controllable impedance circuit coupled with a feedback loop and digital control circuit that adjusts the peak and average load current through pulse-width modulation, using a combination of switching devices and integrator circuits to generate drive signals for precise control of LED light sources, ensuring accurate intensity and color adjustment.

Benefits of technology

This solution enables precise control of LED light sources, preventing erroneous operation and optimizing power management by adjusting current and voltage to achieve desired intensity and color temperatures, thereby enhancing the efficiency and reliability of LED lighting systems.

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Abstract

A controllable lighting device may utilize a controllable impedance circuit to drive a load current through an LED light source. The controllable impedance circuit may be coupled in series with a first switching device, which can be switched on and off by a pulse-width modulated signal to adjust the average magnitude of the load current. The controllable lighting device may further comprise a control loop circuit that includes a second switching device. The second switching device can be switched on and off in coordination with the first switching device to control when a feedback signal is provided to the control loop circuit and used to control the LED light source.The control loop circuit can be differentiated by a time constant that is significantly larger than an operating period of the load current.
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