AC LED Lamp Integrated Circuit Adaptive Control
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Solution Overview
Problem
Existing AC LED lamps face challenges in optimizing the connection period to prevent dark periods and inefficient operation due to fixed connection periods that are either too short or too long, affecting power supply and energy usage.
Innovation Solution
An integrated circuit with a path controller and bank controller that adaptively controls conduction paths and a discharge switch, using power-bad and power-good detectors to dynamically determine the start and end of the connection period based on input voltage levels, ensuring consistent LED illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed connection period is used in AC LED lamps, then the circuit structure is simple, but dark periods occur and operation is inefficient due to fixed periods being too short or too long
Solution Approach 1:
The patent implements adaptive connection period control where the connection period dynamically adjusts based on detected power conditions. The controller extends or reduces the connection period according to whether power is insufficient or excessive, transforming the fixed period system into a dynamic one that optimizes LED operation efficiency while eliminating dark periods.
Solution Approach 2:
The patent employs power detection mechanisms that monitor power conditions and provide feedback to the controller. Based on this feedback about power sufficiency, the controller automatically adjusts the connection period, creating a closed-loop control system that resolves the contradiction between operational efficiency and control complexity.
2Reliability
If the connection period is extended to eliminate dark periods, then LED illumination continuity is improved, but energy usage becomes inefficient
Solution Approach 1:
The connection period is made dynamic rather than fixed, allowing it to extend when power is insufficient to maintain illumination continuity, and reduce when power is sufficient to improve energy efficiency. This dynamic adjustment resolves the contradiction between reliable continuous illumination and energy efficiency.
Solution Approach 2:
The patent changes the connection period parameter adaptively based on detected power conditions. By modifying this key temporal parameter in response to power availability, the system achieves both continuous illumination when needed and energy efficiency when power is abundant.
3Loss of energy
If the connection period is reduced to improve energy efficiency, then energy usage is optimized, but dark periods appear when input voltage is low
Solution Approach 1:
The system dynamically adjusts the connection period based on real-time power detection. When input voltage is low and power is insufficient, the connection period automatically extends to prevent dark periods. When power is sufficient, the period reduces to improve energy efficiency, resolving the contradiction between these two opposing requirements.
Solution Approach 2:
Power detection feedback mechanisms monitor input voltage and power conditions, enabling the controller to make informed decisions about connection period duration. This feedback loop ensures illumination continuity when power is low while maintaining energy efficiency when power is abundant.
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 adaptive control method ensures complete elimination of dark periods while optimizing energy usage by releasing stored energy only when necessary, improving the operational efficiency of AC LED lamps.
Implementation Method 1
a capacitor storing electric energy
Data Source
AI summary
An integrated circuit is suitable for use in an AC LED lamp and is configured to control a power bank coupled between a rectified input voltage and a ground voltage. The AC LED lamp has LED groups arranged in series between the rectified input voltage and the ground voltage. The power bank has a capacitor storing electric energy and a discharge switch coupled between the capacitor and the rectified input voltage. The integrated circuit has a path controller and a bank controller. The path controller controls conduction paths, each coupling a corresponding LED group to the group voltage. The bank controller turns on the discharge switch in response to a first path signal corresponding to a first conduction path, and turns off the discharge switch in response to a second path signal corresponding to a second conduction path. The first and second path signals are different from each other.