Dimming Regulation Circuit for AC Lighting Flicker Reduction
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Solution Overview
Problem
AC direct-type lighting apparatuses experience light flicker due to unstable output voltages from dimmers, which are influenced by the internal RC characteristics and operation characteristics of triac switches, leading to irregular light emission and waveform distortions.
Innovation Solution
A dimming regulation circuit that includes a path control circuit and transmission circuits to stabilize the rectified voltage by determining whether it falls within a preset stabilization range, providing a stabilized voltage to the lamp when necessary, and bypassing unstable voltages to prevent flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a dimmer is used to control light brightness, then the brightness adjustment range is improved, but the output voltage stability deteriorates due to internal RC characteristics and triac operation
Solution Approach 1:
A detection circuit is introduced as an intermediary between the dimmer and the LED lamp. This detection circuit monitors the output voltage of the dimmer and generates detection signals that indicate whether the voltage is stable enough for normal operation, thereby mediating the control between brightness adjustment and voltage stability
Solution Approach 2:
The detection circuit provides feedback about the dimmer's output voltage stability to the control system. When the output voltage is unstable (during initial power-on or when voltage drops below a threshold), the feedback signal triggers a special operating mode that prevents flicker and protects the LED lamp
2Illumination intensity
If phase control is applied at low angles, then brightness control range is improved, but output voltage stability deteriorates causing light flicker
Solution Approach 1:
The detection circuit performs preliminary detection of the dimmer's output voltage before the LED lamp operates. By detecting voltage stability in advance (especially during initial power-on or low-angle phase control), the system can take preventive actions to avoid flicker and instability before they affect the light output
3Adaptability or versatility
If noise is introduced from the power source, then power supply flexibility is improved, but output waveform quality deteriorates due to distortion
Solution Approach 1:
The detection circuit serves as an intermediary that filters and evaluates the quality of input power before it reaches the LED driver. It detects waveform distortions and noise from the power source and uses this information to adjust operating parameters or trigger protection modes, thereby isolating the LED lamp from power quality issues
Data Source
AI summary
The present invention discloses a dimming regulation circuit which stabilizes a rectified voltage in response to an unstable output voltage of a dimmer and a lighting apparatus including the dimming regulation circuit. The dimming regulation circuit stabilizes the rectified voltage and provides the stabilized rectified voltage to a lamp, when a rectified voltage corresponds to a preset stabilization required range.