Self-excited TRIAC Dimming Circuit with Isolation Transformer
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Solution Overview
Problem
Conventional self-excited driving circuits for panel lights lack constant power control, leading to variable brightness and safety issues with non-isolation converters, and fail to meet dimming requirements, affecting electromagnetic compatibility and product competitiveness.
Innovation Solution
A self-excited TRIAC dimming circuit incorporating a dimming module with a power factor controller and a self-excited electronic isolation transformer, along with an output controller to stabilize the driving voltage and current, enabling dimming and multi-output functions while maintaining a simple structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a non-isolation boost power converter is used, then the circuit structure is simple and cost is low, but safety and electromagnetic compatibility are poor
Solution Approach 1:
The patent introduces an isolation transformer as an intermediary component between the power converter and the LED load. This transformer provides galvanic isolation, improving safety and electromagnetic compatibility while maintaining the simplicity of the boost converter circuit. The transformer acts as a mediator that resolves the contradiction between structural simplicity and safety requirements.
2Device complexity
If a self-excited driving circuit without constant power control is used, then the structure is simple and cost is low, but output power varies with input voltage and brightness cannot be maintained
Solution Approach 1:
The patent implements a feedback mechanism through the self-excited oscillating circuit that automatically adjusts the operating point of the isolation transformer based on the load conditions. The feedback winding detects output changes and adjusts the drive signal accordingly, maintaining stable output power and constant LED brightness without requiring complex external control circuits.
3Device complexity
If a conventional self-excited driving circuit is used, then the structure is simple, but dimming control and multi-output functions are not supported
Solution Approach 1:
The patent makes the circuit dynamically adjustable by incorporating a dimming control circuit that can modify the operating parameters of the self-excited oscillating circuit. This allows the output power to be varied for dimming control while maintaining the simple self-excited structure. The circuit can adapt to different power levels and support multiple output configurations without requiring completely different circuit designs.
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 enhances circuit stability, improves safety, and increases product competitiveness by allowing for stable output power and dimming capabilities, addressing the limitations of conventional circuits.
Implementation Method 1
the conversion module is a self-excited electronic isolation transformer and has at least one output controller
Implementation Method 2
Self-excited TRIAC dimming circuit
Data Source
AI summary
A self-excited TRIAC dimming circuit applied in a panel light includes a dimming module and at least one conversion module, and a power factor controller (PFC) is installed in the dimming module, and the conversion module is a self-excited electronic isolation transformer, and the TRIAC PFC is integrated with the circuit structure of a self-excited electronic transformer to improve the overall circuit stability, so that the panel light complies with a high safety standard to enhance product applicability and competitiveness.