LED Lighting Systems With TRIAC Dimmers and Threshold Current Control
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Solution Overview
Problem
LED lighting systems with TRIAC dimmers experience current overshoot and oscillation due to sudden changes in rectified voltage, leading to abnormal operation and flickering of LEDs.
Innovation Solution
A high-compatibility TRIAC dimmer control system that includes a rectifying module, a constant current module, and an enablement control module to regulate current flow based on a threshold voltage, preventing overshoot and oscillation by enabling or disabling the constant current circuit accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a TRIAC dimmer is used to control LED lighting, then dimming functionality is achieved, but current overshoot and oscillation occur due to sudden changes in rectified voltage
Solution Approach 1:
The patent applies preliminary action by detecting the rectified voltage before it causes current overshoot and提前 enabling the constant current circuit. The control circuit monitors the rectified voltage from the TRIAC dimmer and activates the constant current regulation in advance, preventing the harmful current spikes that would otherwise occur when the TRIAC switches states. This proactive approach resolves the contradiction by maintaining current stability while preserving dimming functionality.
2Reliability
If constant current control is continuously active, then LED current stability is maintained, but system complexity increases
Solution Approach 1:
The patent implements periodic action by enabling the constant current circuit only during specific periods when needed - specifically when the rectified voltage from the TRIAC dimmer changes suddenly. The control circuit periodically monitors the rectified voltage and activates constant current regulation only during critical transition periods rather than continuously. This reduces system complexity and power consumption while maintaining current stability when actually required.
3Ease of operation
If TRIAC dimmer operates with sudden voltage changes, then dimming control is achieved, but LED flickering occurs
Solution Approach 1:
The patent applies feedback by using the control circuit to continuously monitor the rectified voltage from the TRIAC dimmer and respond to voltage changes. When the control circuit detects sudden changes in rectified voltage that would cause LED flickering, it activates the constant current circuit to compensate. This feedback mechanism maintains smooth dimming control while eliminating the harmful flickering effect, resolving the contradiction between ease of operation and harmful factors.
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 system stabilizes current flow, preventing abnormal operation of TRIAC dimmers and reducing LED flickering by ensuring consistent current delivery to LEDs.
Implementation Method 1
a rectifying bridge BD1 to generate a rectified voltage 101
Data Source
AI summary
System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.