Dimming Module Phase Control Circuit Flickering
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Solution Overview
Problem
Existing solid state lighting devices using LEDs require multiple phase-cut dimmers for separate control of brightness and color temperature, leading to instability and flickering issues when using traditional phase-cut dimmers.
Innovation Solution
A dimming module comprising a rectifying circuit, phase control circuit, processing circuit, and driving circuits that adjust the phase delay angle of control voltage signals to control the brightness and color temperature of lighting modules, allowing for simultaneous adjustment of brightness and color temperature while minimizing flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional phase-cut dimmers are used to control brightness and color temperature separately, then the lighting device can achieve separate control of brightness and color temperature, but the system becomes unstable and produces undesired flickering
Solution Approach 1:
The patent combines multiple phase-cut dimmers into a single integrated phase control circuit that simultaneously controls both brightness and color temperature. This merging approach eliminates the instability and flickering issues associated with using multiple separate dimmers while maintaining the ability to independently adjust both parameters through a unified control mechanism.
Solution Approach 2:
The phase control circuit is designed to perform multiple functions: it controls both the brightness level and the color temperature of the LED lighting device using a single circuit. This multi-functional approach replaces the need for multiple specialized dimmers, improving system stability while preserving separate control capabilities for both parameters.
2Ease of operation
If two or more set of phase-cut dimmers are required to control brightness and color temperature separately, then independent adjustment of each parameter is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the functionality of multiple phase-cut dimmers into a single integrated phase control circuit. This circuit uses multiple phase-delayed PWM signals to independently control different LED strings with different color temperatures, achieving parameter independence without requiring multiple separate dimmer devices.
Solution Approach 2:
The single phase control circuit is designed with universal functionality to handle both brightness control and color temperature adjustment. By generating multiple phase-shifted control signals, it can independently regulate different lighting channels, effectively replacing multiple specialized dimmers with one multi-functional unit.
3Ease of operation
If traditional phase-cut dimmers are used for dimming control, then brightness adjustment is achieved, but undesired flickering occurs
Solution Approach 1:
The patent employs periodic PWM (Pulse Width Modulation) signaling with phase delay control to adjust brightness. By using high-frequency periodic pulses rather than continuous analog dimming, the system achieves smooth brightness adjustment without the flickering effects characteristic of traditional phase-cut dimmers. The periodic nature of the PWM signals ensures stable LED operation.
Solution Approach 2:
The patent replaces the mechanical switching approach of traditional phase-cut dimmers with electronic PWM control. This substitution eliminates the contact bounce and switching transients that cause flickering in mechanical systems, providing smooth and stable brightness adjustment through electronic pulse width modulation with phase delay.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables stable and efficient control of brightness and color temperature in solid state lighting devices, reducing the need for multiple dimmers and improving the stability of dimming operations.
Implementation Method 1
The rectifying circuit is configured to convert an input ac voltage to a rectified voltage signal
Data Source
AI summary
A dimming module and a solid state lighting device are shown. The dimming module includes a rectifying circuit, a phase control circuit, a processing circuit and a first driving circuit. The rectifying circuit is configured to convert an input AC voltage to a rectified voltage signal. The phase control circuit is configured to receive the rectified voltage signal and a dimming command, and output a control voltage signal correspondingly in which the phase control circuit controls a phase delay angle of the control voltage signal according to the dimming command. The processing circuit is configured to receive the control voltage signal and adjust a first driving voltage signal according to the phase delay angle. The first driving circuit is configured to receive the first driving voltage signal to drive a first lighting module.