Parallel LED Circuit with Constant Voltage Element for Color Tuning
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Solution Overview
Problem
Conventional light-emitting devices require separate power circuits for each LED element array with different color temperatures, leading to color variations due to input power differences from varying power circuit characteristics.
Innovation Solution
A light-emitting device configuration with a first and second light-emitting element connected in parallel, where the second element includes a constant voltage element, allowing spectral distribution change by adjusting power from a single power circuit, enabling color tuning without separate power circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate power circuits are used for each LED element array with different color temperatures, then color control flexibility is improved, but device complexity and power loss increase
Solution Approach 1:
The patent combines multiple LED element arrays with different color temperatures into a single parallel circuit configuration, where all arrays share a common power supply. This merging approach reduces the number of separate power circuits needed while maintaining the ability to control overall color temperature through a single control signal that adjusts the current distribution among the parallel arrays.
Solution Approach 2:
The patent creates a universal power circuit design that can control multiple LED arrays with different color temperatures using a single control mechanism. The constant voltage element serves multiple functions by simultaneously regulating voltage and enabling color temperature adjustment across different LED arrays, reducing the need for separate control circuits for each array.
2Adaptability or versatility
If separate power circuits are used for each LED element array, then color tuning capability is improved, but power loss increases
Solution Approach 1:
By merging multiple LED arrays into a single parallel power circuit, the patent reduces the total number of power conversion stages and control circuits, thereby minimizing energy loss. The shared power supply and unified control approach eliminate redundant power management components that would otherwise contribute to energy loss in separate circuit configurations.
3Adaptability or versatility
If multiple LED element arrays with different color temperatures are used, then spectral distribution control is improved, but device size increases
Solution Approach 1:
The patent merges multiple LED element arrays with different color temperatures into a compact parallel circuit arrangement that shares common electrical connections and control pathways. This integration reduces the overall space required compared to separate modular configurations, while maintaining the capability to control spectral distribution by adjusting the current ratio among the parallel arrays.
4Adaptability or versatility
If LED element arrays are connected in parallel with constant voltage element, then color tuning is enabled with single power circuit, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the IF-VF (current-forward voltage) characteristic parameters of LEDs to enable color tuning. By selecting LED elements with specific IF-VF characteristics and connecting them in parallel with a constant voltage element, the system achieves color control through parameter-based selection rather than complex circuitry, balancing manufacturing precision requirements with functional capability.
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
Enables color tuning and reduces the need for multiple power circuits, minimizing color variations and device size, while maintaining energy efficiency and suppressing power loss.
Implementation Method 1
The first light-emitting element includes a first light-emitting diode, and emits a first spectrum. The second light-emitting element includes a second light-emitting diode
Data Source
AI summary
A light-emitting device includes a first light-emitting element and a second light-emitting element. The first light-emitting element has a first LED, and emits a first spectrum. The second light-emitting element has a second LED and a constant voltage element connected in series, and emits a second spectrum different from the first spectrum. The second light-emitting element is connected in parallel to the first light-emitting element. First light-emitting element and the second light-emitting element are configured such that their lines indicating the forward current-forward voltage characteristics cross each other. This enables to change spectral distribution emitted from the light-emitting device just by changing power supplied from a single power circuit.