Constant Current Source Driving System for LED Heat Recovery
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Solution Overview
Problem
Conventional LED driving systems face issues with voltage and current fluctuations, leading to heat loss, reduced luminous flux, and shortened LED service life due to the inability to handle high-voltage AC power directly and the need for series connection of LEDs, which results in all LEDs being affected if one is damaged.
Innovation Solution
A constant-current-source driving system comprising a power source module, primary and secondary working load modules, and a weighting controller connected to a variable-impedance controller, which compares current values to maintain a constant current and modulate impedance in real-time, ensuring stable operation and energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diodes and resistors are used to control voltage polarity and limit current, then the LED can be protected from voltage damage, but voltage is lost and converted into heat
Solution Approach 1:
The patent recovers the voltage that would otherwise be lost in the driving circuit and uses it to drive a secondary load (such as a heating element or another LED string), converting the harmful voltage loss into useful energy output
Solution Approach 2:
The patent uses a variable impedance controller to dynamically adjust the impedance parameters in real-time, enabling constant current control and optimizing the voltage distribution to minimize energy loss while maintaining LED protection
2Loss of energy
If multiple LEDs are connected in series to reduce heat loss, then voltage loss is reduced, but if one LED is damaged, all LEDs in the circuit fail
Solution Approach 1:
The patent divides the LED circuit into multiple independent parallel branches, each with its own constant current control. This segmentation ensures that a failure in one branch does not affect other branches, maintaining overall system reliability while still using series connections within each branch to reduce heat loss
3Device complexity
If input current varies to drive the LED, then the circuit is simpler, but the luminous flux fluctuates and the LED may be damaged or have shortened service life
Solution Approach 1:
The patent implements a feedback control mechanism where the controller continuously monitors the current through the LED and adjusts the variable impedance in real-time to maintain constant current, ensuring stable luminous flux and extended LED service life
Solution Approach 2:
The patent uses a dynamically adjustable variable impedance controller that adapts its resistance in real-time based on circuit conditions, enabling constant current control without requiring a completely complex circuit design
Data Source
AI summary
The present invention provides a constant-current-source driving system, comprising: a power source module, a primary working load module, a secondary working load module, and a weighting controller. The primary working load module is connected to the power source module in order to be driven by electricity provided by the power source module. The secondary working load module is connected to the primary working load module and parallel-connected to a variable-impedance controller. The weighting controller is connected to a first circuit of the variable-impedance controller and to a second circuit of the secondary working load module in order to obtain a first current value of the first circuit and a second current value of the second circuit, wherein the weighting controller compares a sum of the first current value and the second current value with a preset target current value and sends a control signal to the variable-impedance controller as feedback in order for a constant current to be supplied to the primary working load module.