LED Driver Current Redistribution for IC Heat Reduction
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Solution Overview
Problem
LED lighting devices experience increased heat generation and restricted LED current and battery voltage due to elevated battery voltages, necessitating a solution to expand their usable range while reducing IC heat generation.
Innovation Solution
An LED driving device with an IC heat dissipation part between the LED string and current controller redistributes IC power by diverting current through a secondary path via heat dissipation resistors, reducing IC heat generation and expanding the usable range of LED current and battery voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery voltage increases, then the power supply capability is improved, but the IC heat generation increases and restrictions on LED current and battery voltage occur
Solution Approach 1:
The patent segments the single current controller into multiple current controllers (first current controller and second current controller). Each controller handles a portion of the total LED current, thereby distributing the power handling responsibility and reducing the heat generation in each individual IC. This segmentation allows the system to utilize higher battery voltages without overloading a single IC's thermal capacity.
Solution Approach 2:
The patent introduces a diode as an intermediary component between the battery and the LED string. The diode's forward voltage drop serves as a voltage regulator, allowing the system to accommodate higher battery voltages by dissipating the excess voltage through the diode's inherent electrical characteristics. This intermediary protects the current controllers from excessive voltage stress and associated heat generation.
2Illumination intensity
If the number of LEDs is increased, then the illumination intensity is improved, but the heat generation in the current controller increases
Solution Approach 1:
The patent divides the LED string into multiple parallel LED strings, with each string controlled by its own current controller. This segmentation allows the total illumination requirement to be distributed across multiple lower-power channels, reducing the heat generation burden on each individual current controller while maintaining the overall high illumination intensity through the combined output of all LED strings.
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 solution effectively reduces IC heat generation and expands the usable range of LED current and battery voltage by distributing IC power, enhancing the stability and efficiency of LED lighting devices.
Implementation Method 1
an IC heat dissipation part connected to a node between the LED string and the current controller to dissipate IC heat of the current controller
Implementation Method 2
the IC heat dissipation part dissipates a first LED current flowing from the LED string to the current controller and simultaneously increases a second LED current flowing from the LED string to the current controller via the IC heat dissipation part
Data Source
AI summary
The present disclosure relates to a light emitting diode (LED) driving device that may expand a usable range of LED current and battery voltage by reducing heat generation of an integrated circuit, and an LED lighting device including the same, which may include a current controller that constantly controls an LED current flowing through an LED string and an IC heat dissipation part connected to a node between the LED string and the current controller to dissipate IC heat of the current controller, wherein when a battery voltage supplied to the LED string increases, the IC heat dissipation part reduces a first LED current flowing from the LED string to the current controller and simultaneously increases a second LED current flowing from the LED string to the current controller via the IC heat dissipation part, thereby reducing the IC heat generation of the current controller.