LED Light Bar Current Multiplication via Parallel Driving Modules
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Solution Overview
Problem
Conventional LED backlight driving circuits are limited by the maximum current of individual constant current driving chips, which restricts the brightness of LED light bars, failing to meet the luminance demands of large-sized liquid crystal displays.
Innovation Solution
A method and circuit that utilize multiple constant current driving modules and resistors, along with a PWM control source, to increase the electrical current flowing through an LED light bar, allowing simultaneous driving by multiple modules to enhance luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an individual constant current driving module is used to drive an LED light bar, then the circuit structure remains simple, but the maximum current is limited to 300 mA which restricts the luminance for large-sized displays
Solution Approach 1:
The patent divides the driving function into multiple independent constant current driving modules (first, second, and third driving modules), each capable of driving the LED light bar independently. By segmenting the driving function across multiple modules connected in parallel, the system achieves higher total current output (exceeding 300 mA) while maintaining relative simplicity in each individual module's design. Each module includes basic components like resistors and switching elements that can be independently controlled.
2Power
If multiple constant current driving modules are used to increase current, then the luminance requirement is met, but the circuit structure becomes more complex
Solution Approach 1:
The patent combines multiple constant current driving modules in a parallel configuration where each module shares common connections to the LED light bar's positive and negative terminals. This merging approach allows the modules to work together to deliver increased total current (power) to the LED light bar, while the shared circuit paths and common control structure help manage the overall system complexity rather than allowing it to multiply linearly with the number of modules.
Data Source
AI summary
The present invention provides a method for multiplying current of an LED light bar, which includes (1) providing a constant current driving chip that includes driving modules each having first to three pins and resistors; (2) providing an LED light bar, a power source, and a PWM control source; (3) connecting an end of one resistor to the third pin of one driving module and an opposite end grounded, connecting the first pin of the driving module to the negative terminal of the light bar, connecting the second pin of the driving module to the PWM control source, and connecting the positive terminal of the light bar to the power source; (4) repeating step (3) as necessary to have multiple driving modules electrically connected to the light bar; (5) activating the power source and the PWM control source to allow the driving modules to simultaneous drive the light bar.