LED Driver IC Time-Division Current Control
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Solution Overview
Problem
Conventional LED light emitting devices require multiple LED driver ICs and DC/DC components for each LED, increasing the number of components and complexity, making it difficult to individually dim multiple LEDs efficiently.
Innovation Solution
A light emitting element drive device that generates a single output current and switches target current values for multiple LEDs in a time division manner, using a current controller with hysteresis or error amplifier control to stabilize output currents and reduce component count, including a comparator, error amplifier, and threshold voltage generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LED driver ICs are used to individually dim multiple LEDs, then individual dimming control is achieved, but the number of components increases
Solution Approach 1:
The patent merges multiple LED driver ICs into a single integrated circuit that can control multiple LEDs individually. The single driver IC includes multiple current control circuits, each capable of independently controlling the current to a specific LED, thereby achieving individual dimming control without requiring multiple separate driver ICs.
Solution Approach 2:
The single LED driver IC is designed with multi-functionality to perform the roles of multiple driver ICs. It includes multiple output channels with independent current control capabilities, allowing one device to serve multiple functions and control multiple LEDs with individual dimming, thus reducing the overall component count.
2Adaptability or versatility
If multiple DC/DC components are externally attached to LED driver ICs, then current control for multiple LEDs is achieved, but device complexity and harness extension increase
Solution Approach 1:
The patent integrates multiple DC/DC conversion functions and current control capabilities into a single LED driver IC. This integration eliminates the need for externally attached DC/DC components and extensive harness connections, as all necessary functions are consolidated within the single integrated circuit.
Solution Approach 2:
The single LED driver IC acts as an intermediary that provides all necessary current control functions internally. Instead of requiring external DC/DC components and complex harness arrangements, the driver IC directly generates and regulates the required currents for multiple LEDs through its integrated circuits, simplifying the overall system architecture.
Data Source
AI summary
A light emitting element drive device generates a single output current while switching a target current value for each of a plurality of light emitting elements, and supplies the single output current to the plurality of light emitting elements in a time division manner.