Integrated LED Package with Constant Current Driver
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Solution Overview
Problem
Existing light emitting diode (LED) technologies require separate power supplies and current control circuits, which can be cumbersome and inefficient, especially when space is limited and voltage matching is not optimal.
Innovation Solution
Integration of power supply and current control components directly into the LED package, including voltage level converters and constant current circuits, to match the source voltage with the LED's operating voltage, eliminating the need for external power supplies and simplifying installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power supplies and current control circuits are used for LEDs, then voltage matching and current control can be achieved, but device complexity and space requirements increase
Solution Approach 1:
The patent combines the power supply circuit, current control circuit, and LED into a single integrated package. The power supply circuit includes a rectifier bridge and filtering capacitors, while the current control circuit uses a constant current source design with transistors and resistors, all integrated with the LED on a common substrate to eliminate separate external components.
Solution Approach 2:
The integrated package serves multiple functions simultaneously: voltage rectification, current regulation, and light emission. The power supply circuit can accommodate various input voltages (AC or DC) and automatically adapts to drive the LED at the correct operating current, making the device universally applicable without requiring external circuitry.
2Ease of operation
If external power supplies and control components are used, then LED operation can be controlled, but the number of components and space requirements increase
Solution Approach 1:
The patent integrates the power supply circuit, current control circuit, and LED into a single compact package. The power supply includes a rectifier bridge and filtering capacitors, while the current control uses a constant current source design with transistors and resistors, all combined with the LED on a common substrate to eliminate separate external components.
Solution Approach 2:
The integrated package is self-contained and self-regulating. The constant current control circuit automatically adjusts the drive current based on the LED's operating characteristics, eliminating the need for external control components or user intervention to match voltage and current parameters.
3Adaptability or versatility
If voltage sources are not matched to LED operating voltage, then power supply flexibility is maintained, but LED efficiency and performance decrease
Solution Approach 1:
The patent incorporates a constant current control circuit that dynamically adjusts the drive current parameter to match the LED's operating characteristics. The circuit includes sensing resistors and control transistors that monitor and regulate the current flow, ensuring optimal efficiency regardless of the input voltage source (AC or DC, various voltage levels).
Solution Approach 2:
The power supply circuit is designed to accept various input voltage types (AC or DC) and automatically adapts its operation to provide the correct current to the LED. This universal input capability combined with automatic current regulation maintains both flexibility and efficiency across different power source conditions.
Data Source
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AI summary
An LED package containing integrated circuitry for matching a power source voltage to the LED operating voltage, LEDs containing such integrated circuitry, systems containing such packages, and methods for matching the source and operating voltages are described. The integrated circuitry typically contains a power converter and a constant current circuit. The LED package may also contain other active or passive components such as pin-outs for integrated or external components, a transformer and rectifier, or a rectifier circuit. External components can include control systems for regulating the LED current level or the properties of light emitted by the LED. Integrating the power supply and current control components into the LED can provide for fabrication of relatively small LEDs using fewer and less device-specific components.