Light-Emitting Diode Lamp String Impedance Balancing for Uniform Brightness
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Solution Overview
Problem
Light-emitting diode lamp strings experience uneven brightness due to line losses causing variations in operating voltage across individual lamps, and the complexity of existing control circuits increases production costs.
Innovation Solution
A light-emitting diode lamp string system with a control apparatus that includes a controller, power circuit, controlled switch, and impedance component, along with impedance-balancing units and linear controllers, to stabilize voltage and current across lamps, ensuring consistent brightness and simplifying the control circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the operating voltage is increased to make the light-emitting diode brighter, then the current flowing through the light-emitting diode increases, but the line losses cause uneven voltage distribution across multiple lamps resulting in uneven brightness
Solution Approach 1:
The patent introduces impedance components (resistors) in parallel with each light-emitting diode lamp to change the electrical parameters of the circuit. By adjusting the impedance values, the voltage distribution across each lamp is equalized, ensuring uniform brightness while maintaining high operating voltage for brightness.
Solution Approach 2:
The impedance components act as intermediary elements between the power source and the light-emitting diodes. These intermediate components compensate for the line losses by dropping the excess voltage, thereby mediating the voltage distribution to achieve uniform brightness across all lamps in the string.
2Adaptability or versatility
If complicated electronic circuits are used in the lamp string controller to generate control instructions, then the lighting control functionality is improved, but the production cost increases
Solution Approach 1:
The patent enables each light-emitting diode lamp to function as its own control unit by integrating a controller and impedance-balancing unit directly into the lamp module. This self-service approach eliminates the need for a complex centralized controller, reducing production costs while maintaining full lighting control functionality through individual lamp autonomy.
Solution Approach 2:
The control functionality is segmented and distributed across individual lamp modules rather than concentrated in a single complex controller. Each lamp module contains its own control circuitry, which simplifies the overall system architecture and reduces manufacturing costs while preserving adaptability and versatility in lighting control.
3Stability of the object's composition
If the impedance component is added to form a second loop with the controlled switch, then the voltage stability is improved, but the device complexity increases
Solution Approach 1:
The impedance component forms a parallel loop with the controlled switch, creating an equipotential structure that stabilizes the voltage across the light-emitting diode. By providing an alternative current path through the impedance component, the circuit maintains stable voltage levels even when the switch state changes, thereby improving voltage stability with minimal added complexity.
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 system stabilizes voltage and current, achieving uniform brightness and simplifies the control circuit, reducing complexity and cost while maintaining consistent lighting performance.
Implementation Method 1
the impedance-balancing unit adjusts an impedance of the light-emitting diode lamp to a fixed impedance based on the direct-current power received by the light-emitting diode lamp
Implementation Method 2
the controller switches the controlled switch to turn on or off the controlled switch, so that when the controlled switch is turned on, a first voltage is formed from the direct-current power through the first loop, and when the controlled switch is turned off, a second voltage is formed from the direct-current power through the second loop
Implementation Method 3
the light-emitting diodes have been widely used in many light-emitting products
Data Source
AI summary
A light-emitting diode lamp string system includes a light-emitting diode lamp string and a control apparatus. The light-emitting diode lamp string includes a plurality of light-emitting diode lamps. The light-emitting diode lamp includes a first controller, a power circuit, an impedance-balancing unit, and a plurality of light-emitting diodes. The control apparatus is used to receive a direct-current power and includes a controller, a controlled switch, and an impedance component. When the controller performs a lighting mode, the controller switches the controlled switch to turn on or off the controlled switch. The impedance-balancing unit adjusts an impedance of the light-emitting diode lamp to a fixed impedance based on the direct-current power received by the light-emitting diode lamp, so that a voltage of each of the light-emitting diode lamps is similar.