LED Light-Emitting Device with Dynamic Series-Parallel Switching
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Solution Overview
Problem
Conventional LED lighting systems face challenges due to high operating voltage and inefficiencies in converting alternating current to direct current, leading to increased costs and power loss, making them less competitive with traditional light sources.
Innovation Solution
A light-emitting device with multiple light-emitting units and switching units that dynamically connect in parallel and series configurations in response to periodic voltage signals, optimizing power usage and reducing power loss by controlling current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC-DC converter is used to convert alternating current to direct current for conventional LED, then LED can operate with stable current, but the converter adds large volume, heavy weight, increased cost, and 15%-30% power loss
Solution Approach 1:
The patent removes the AC-DC converter from the system by directly connecting the LED to the AC power source through a switching circuit. The converter's function of current regulation is replaced by a switching mechanism that controls current flow during AC cycles, eliminating the need for separate conversion hardware and its associated power losses.
Solution Approach 2:
The patent replaces the conventional AC-DC converter (electromechanical conversion system) with a semiconductor switching circuit that directly controls current flow. This substitution eliminates the mechanical/electromechanical conversion process that caused power losses, using instead electronic switching to achieve current regulation.
2Reliability
If AC-DC converter is used for conventional LED, then LED can operate with stable current, but the converter increases device complexity and cost
Solution Approach 1:
The patent extracts and removes the AC-DC converter from the system, replacing it with a simpler switching circuit integrated directly into the LED driver. This eliminates the complex conversion stages while maintaining reliable operation through direct AC control.
Solution Approach 2:
The switching circuit serves multiple functions: it rectifies AC, regulates current, and protects the LED, replacing what would traditionally require separate AC-DC conversion, current regulation, and protection circuits. This multi-functionality reduces overall system complexity.
3Stress or pressure
If light-emitting units are connected in parallel, then operating voltage is reduced, but current consumption increases
Solution Approach 1:
The patent uses a switching circuit that dynamically changes the connection configuration between light-emitting units based on instantaneous AC voltage levels. During high voltage portions of the AC cycle, units are connected in series to reduce current; during low voltage portions, they are connected in parallel to maintain operation, creating a dynamic adaptation to voltage conditions.
Solution Approach 2:
The patent changes the electrical connection parameters (series/parallel configuration) of light-emitting units in response to changing AC voltage parameters. This allows the system to adapt to varying voltage conditions, maintaining efficient operation across different voltage levels by adjusting both connection topology and operating parameters.
4Use of energy by moving object
If light-emitting units are connected in series, then operating voltage is increased, but current consumption decreases
Solution Approach 1:
The switching circuit dynamically reconfigures the series/parallel connections of light-emitting units based on instantaneous AC voltage levels. When AC voltage is high, units are connected in series to reduce current draw; when voltage is low, the circuit switches to parallel or partial-series configurations to maintain adequate current flow and lighting output.
Solution Approach 2:
The system adjusts both the connection configuration and operating voltage parameters of light-emitting units in response to AC voltage variations. This dual parameter adjustment allows the system to optimize current consumption while adapting to the available voltage, preventing both excessive current draw and insufficient lighting output.
Data Source
AI summary
A light-emitting device is capable of receiving a first voltage signal, a second voltage signal, and a third voltage signal in sequence. The light-emitting device includes a first light-emitting unit, a second light-emitting unit, and a switching. The first voltage signal, the second voltage signal, and the third voltage signal is configured to introduce a first current signal, a second current signal, and a third current signal, respectively. The light-emitting device is configured to emit a first light when introducing the first current signal, the second current signal, and the third current signal. The light-emitting device is configured to emit a second light when introducing the second current signal and the third current signal. The light-emitting device is configured to emit a third light when introducing the second current signal.