Single-Stage LED Driver Circuit with Frequency-Detected Feedback
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Solution Overview
Problem
Existing LED driving circuits require two-stage converters to be compatible with AC mains, CCG, and ECG, resulting in low efficiency and high costs.
Innovation Solution
A single-stage converter LED driving circuit with a detecting circuit to differentiate between low and high frequency currents, using feedback loops to adjust converter switch turn-on time based on detected current conditions, and including a fast recovery rectifier and selecting circuit for efficient DC power conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a two-stage converter is used to be compatible with AC mains, CCG, and ECG, then compatibility is improved, but working efficiency deteriorates and cost increases
Solution Approach 1:
The patent combines the functions of frequency detection, feedback selection, and power conversion into a single integrated circuit architecture. The detecting circuit, selecting circuit, and feedback loops are merged to work协同 within one stage converter, eliminating the need for separate two-stage converter modules while maintaining compatibility across AC mains, CCG, and ECG inputs.
Solution Approach 2:
The single-stage converter is designed with universal functionality to handle multiple input types (AC mains, CCG, ECG) through a unified architecture. The detecting circuit identifies input type and the selecting circuit routes appropriate feedback loops, enabling one converter stage to perform what traditionally required two separate stages, thereby improving efficiency while maintaining broad compatibility.
2Adaptability or versatility
If a two-stage converter is used to be compatible with AC mains, CCG, and ECG, then compatibility is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple functional blocks (detecting circuit, selecting circuit, feedback loops) into a coordinated single-stage converter system. This integration reduces the number of discrete components and interconnections required compared to a two-stage converter, simplifying the overall circuit architecture while maintaining the ability to handle multiple input types.
Solution Approach 2:
The circuit employs dynamic switching between different feedback loops based on input detection. The selecting circuit dynamically connects either the first feedback loop (for AC mains/CCG) or the second feedback loop (for ECG) based on real-time input conditions, allowing a single static circuit topology to adapt to multiple input types without requiring complex reconfiguration hardware.
3Adaptability or versatility
If different feedback loops are used for low frequency and high frequency current, then compatibility is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic feedback loop selection where the selecting circuit automatically connects the appropriate feedback loop based on input frequency detection. For low frequency inputs (AC mains/CCG), the first feedback loop is activated; for high frequency inputs (ECG), the second feedback loop is activated. This dynamic switching mechanism allows the use of multiple specialized feedback loops without permanently increasing circuit complexity, as only one loop is active at any given time.
Solution Approach 2:
The selecting circuit acts as an intermediary that manages the switching between different feedback loops. This intermediary component simplifies the overall system by providing a centralized control point for feedback loop selection, rather than requiring complex interconnections and switching mechanisms between multiple active feedback paths. The intermediary handles the complexity of loop selection internally while presenting a simplified interface to the rest of the circuit.
Data Source
AI summary
The LED driving circuit includes: a detecting circuit that detects whether an input current of the driving circuit is low or high frequency; a first stage converter that converts the input of the driving circuit to provide a DC power suitable for the LED; a first feedback loop that is activated by a low frequency current, to convert a current from a LED load to a feedback voltage and feed it back to the first stage converter, wherein in the first feedback loop, the feedback voltage changes as a function of the current of the LED load; and a second feedback loop that is activated by high frequency current, to convert the current from the LED load to the feedback voltage and feed it back to the first stage converter, wherein in the second feedback loop, the feedback voltage changes as a function of the current of the LED load.