LED Illumination Control via Dynamic Series-Parallel Switching
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Solution Overview
Problem
Semiconductor LEDs driven by AC voltage experience fluctuations in light emission times due to variations in rectifying current voltage, leading to uneven wear and deterioration of LEDs, affecting the overall light emitting state and operation of illumination apparatuses.
Innovation Solution
An illumination apparatus with a rectifier, control signal generator, switch unit, current controller, and light emitting unit that adjusts the electrical connection and current supply to all LEDs, ensuring consistent light emission and preventing premature wear by managing AC voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semiconductor LEDs are driven using AC voltage with rectifying current voltage adjustment, then the illumination apparatus can operate with commercial AC power, but some LEDs continuously emit light over extended periods while others emit light only when voltage exceeds specific values, causing uneven wear and premature failure
Solution Approach 1:
The patent implements dynamic switching of LED connection configurations between series and parallel arrangements based on the magnitude of rectifying current voltage. When voltage is high, LEDs are connected in series to reduce individual current and prevent overheating. When voltage is low, LEDs are connected in parallel to ensure sufficient current for light emission. This dynamic adaptation ensures all LEDs operate within safe parameters, preventing premature failure while maintaining AC voltage compatibility.
Solution Approach 2:
The patent changes the electrical connection parameters (series/parallel configuration) of LEDs based on the detected rectifying current voltage magnitude. The control signal generator compares voltage levels with reference values and generates appropriate switch control signals to reconfigure LED connections. This parameter change strategy ensures uniform operating conditions for all LEDs across varying AC voltage magnitudes, resolving the reliability issue while maintaining adaptability.
2Loss of energy
If the number of emitting LEDs is adjusted with voltage fluctuations, then power consumption is optimized, but the light emitting state deteriorates and apparatus operation is prevented due to uneven LED wear
Solution Approach 1:
The patent dynamically reconfigures LED connection patterns (series/parallel) based on real-time voltage detection rather than simply adjusting the number of emitting LEDs. This dynamic approach ensures all LEDs remain in the circuit and emit light uniformly, preventing any single LED from operating continuously at high stress levels. The switch unit responds to control signals that change connection topology, maintaining both energy efficiency and apparatus reliability.
Solution Approach 2:
The control signal generator performs preliminary comparison of rectifying current voltage with reference voltage levels before generating switch control signals. This preliminary action allows the system to proactively reconfigure LED connections before voltage conditions cause harmful effects, ensuring all LEDs operate within safe parameters and preventing premature failure while optimizing power consumption.
3Productivity
If all LEDs are connected to emit light simultaneously, then illumination output is maximized, but some LEDs wear out earlier due to continuous operation under varying voltage conditions
Solution Approach 1:
The patent uses dynamic switching between series and parallel LED connections to maintain simultaneous illumination from all LEDs while protecting against uneven wear. In parallel configuration, all LEDs receive current and emit light simultaneously for high illumination output. In series configuration, the same current flows through all LEDs, ensuring uniform stress distribution. The switch unit dynamically transitions between these configurations based on voltage levels, maintaining productivity while ensuring reliability.
Solution Approach 2:
The patent changes the electrical connection parameters of LEDs based on detected voltage magnitude to balance illumination output and wear uniformity. The control system monitors voltage and reconfigures LED connections accordingly, ensuring all LEDs remain in the circuit and contribute to illumination while operating under controlled conditions that prevent premature failure of any individual LED.
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
All LEDs in the apparatus emit light consistently, preventing uneven wear and maintaining the light emitting state, with the ability to control total or individual LED currents to be constant, thus extending the apparatus's operational lifespan.
Implementation Method 1
a rectifier configured to receive AC power and generate a driving voltage in the form of a rectifying current voltage
Implementation Method 2
light emitting diodes (LEDs) configured to perform a light emitting operation
Data Source
AI summary
An illumination apparatus capable of controlling current amounts of LEDs and enabling various electrical connections is provided. An applied driving voltage is divided, and a divided voltage is compared with a reference voltage to generate sampling signals. A logic operation is performed on the sampling signals to generate a switch control signal and a current control signal. The switch control signal controls electrical connection of LEDs to which the driving voltage is applied. Also, the current control signal may select LEDs that are to perform light emitting operations. A target voltage is set by processing the sampling signals and used to determine driving currents of the LEDs that are to perform the light emitting operations.