LED dimming control circuit and system

By introducing dimming signal, output current, and demagnetizing signal sampling units into the LED dimming control circuit, precise frequency and current control signals are generated, solving the problems of narrow dynamic range and inductor saturation in traditional LED dimming control circuits, and achieving high-precision and smooth dimming effects.

CN122227463APending Publication Date: 2026-06-16ON BRIGHT INTEGRATIONS CO INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ON BRIGHT INTEGRATIONS CO INC
Filing Date
2026-04-03
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Traditional LED dimming control circuits suffer from narrow dynamic range and poor dimming depth, especially in the low brightness area where dimming is unstable and there is a risk of inductor saturation.

Method used

The system employs a dimming signal sampling unit, an output current sampling unit, and a demagnetizing signal sampling unit, combined with a signal processing unit to generate a maximum operating frequency signal and a peak current control signal. These signals are then used to drive the power transistor via a PWM signal output unit, thereby achieving precise control of the switching power supply and preventing inductor saturation.

Benefits of technology

It achieves wide dynamic range and high-precision dimming control, avoiding dimming instability and inductor saturation risks at low brightness, and ensuring the smoothness of the dimming process and the reliability of the system.

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Abstract

The application provides an LED dimming control circuit and system. The circuit comprises: a dimming signal sampling unit for outputting a dimming voltage signal; an output current sampling unit for outputting a peak voltage sampling signal corresponding to a peak current of a power tube; a demagnetization signal sampling unit for outputting a demagnetization feedback signal; a signal processing unit for generating a demagnetization signal indicating the start and end of demagnetization of an inductive element, and generating a maximum operating frequency signal and a peak current control signal based on the dimming voltage signal, the peak voltage sampling signal and the demagnetization signal; a PWM signal output unit for generating a PWM signal for driving the power tube based on the maximum operating frequency signal and the peak current control signal. The maximum operating frequency signal is used to control the opening of the power tube, and the peak current control signal is used to control the shutdown of the power tube when the peak voltage sampling signal is greater than a preset threshold, and not to control the shutdown of the power tube when the peak voltage sampling signal is less than or equal to the preset threshold.
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