LED Lamp String Impedance Balancing for Uniform Brightness
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Solution Overview
Problem
Existing light-emitting diode (LED) lamp strings face challenges due to complicated electronic circuits in controllers for generating lighting signals and uneven brightness across LED lamps caused by voltage line losses.
Innovation Solution
A light-emitting diode lamp string system that includes a control apparatus with a controller, power circuit, controlled switch, and impedance component, along with impedance-balancing units in each LED lamp to stabilize voltage and adjust impedance for uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complicated electronic circuits are used in the lamp string controller to generate control instructions, then the lighting control function is improved, but the production cost increases
Solution Approach 1:
The patent extracts the complex control circuitry from the central controller and relocates intelligence to individual lamp units. Each light-emitting diode lamp incorporates its own control circuit that can independently process control signals, eliminating the need for a complex centralized control system while maintaining full lighting control functionality.
Solution Approach 2:
The patent segments the control system into distributed intelligent units at the lamp level. Each lamp becomes an independent controllable entity with its own control circuit, replacing the traditional centralized control architecture. This segmentation simplifies the overall system design while enabling flexible lighting control.
2Illumination intensity
If the operating voltage is higher to increase current flowing through the light-emitting diode lamp string, then the brightness is improved, but the line losses increase causing uneven brightness
Solution Approach 1:
The patent applies local quality by providing each light-emitting diode lamp with its own constant current control circuit. This allows each lamp to independently regulate its current consumption based on its position in the string, compensating for voltage drops along the line. Each lamp receives customized current control rather than uniform voltage supply, ensuring consistent brightness throughout the entire lamp string.
Solution Approach 2:
The patent implements feedback control at the lamp level through constant current control circuits. Each lamp's control circuit monitors and adjusts its current consumption in real-time, creating a feedback mechanism that compensates for line losses. This ensures that each lamp maintains its designated current level regardless of voltage drops in the power distribution network.
Data Source
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AI summary
A light-emitting diode lamp string system (10) includes a light-emitting diode lamp string (20) and a control apparatus (30). The light-emitting diode lamp string (20) includes a plurality of light-emitting diode lamps (200). The light-emitting diode lamp (200) includes a first controller (1), a power circuit (310), an impedance-balancing unit (56), and a plurality of light-emitting diodes (2). The control apparatus (30) is used to receive a direct-current power (302) and includes a controller (304), a controlled switch (306), and an impedance component (308). When the controller (304) performs a lighting mode, the controller (304) switches the controlled switch (306) to turn on or off the controlled switch (306). The impedance-balancing unit (56) adjusts an impedance of the light-emitting diode lamp (200) to a fixed impedance based on the direct-current power (302) received by the light-emitting diode lamp (200), so that a voltage of each of the light-emitting diode lamps (200) is similar.