LED Driving Apparatus Common Detection Resistor Circuit Area Reduction
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Solution Overview
Problem
Existing LED driving apparatuses that use AC-DC converters are bulky and power-consuming, increasing the circuit area and manufacturing costs due to the need for resistors to control current flow in LEDs driven by AC power.
Innovation Solution
An AC direct driving type LED driving apparatus utilizing a common detection resistor and drivers with different offset voltages to control the switching of LEDs based on voltage levels, reducing the need for resistors and minimizing circuit area and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a general AC-DC converter is used to drive LED with commercial AC power, then the LED can be driven with stable DC power, but the device becomes voluminous and consumes large amount of power
Solution Approach 1:
The patent extracts and eliminates the AC-DC converter component from the LED driving system. Instead of using a conventional AC-DC converter to convert AC power to DC power, the invention directly drives the LED with AC power after simple rectification, removing the bulky converter and associated large capacitor while maintaining reliable LED operation through AC-compatible driving circuitry
Solution Approach 2:
The patent replaces the mechanical/electrical AC-DC conversion system with a direct AC driving approach. The complex converter circuitry is substituted with a simpler rectifying circuit and AC-optimized driving circuit that directly controls the LED using rectified AC power, eliminating the need for large filtering capacitors and complex conversion stages
2Manufacturing precision
If resistors are connected to individual LEDs to control current flow, then the LED current can be precisely controlled, but the circuit area and manufacturing costs increase
Solution Approach 1:
The patent merges the current control function from individual resistor-based control into a centralized current control circuit. Instead of placing resistors at each LED, the invention uses a single detection resistor combined with a microcontroller and driving circuit that monitors and controls the current flowing through the LED string, achieving precise current control with significantly reduced circuit area
Solution Approach 2:
The patent implements a universal current control mechanism that serves multiple LEDs simultaneously. The detection resistor and control circuitry function as a shared resource for controlling the entire LED string or parallel LED groups, replacing the need for dedicated resistors for each LED and enabling precise current control across all LEDs through a single multi-functional control system
Data Source
AI summary
There are provided a light emitting diode (LED) driving apparatus and an LED lighting apparatus, in which a common detection resistor detecting a current flowing in each LED is used. According to exemplary embodiments of the present disclosure, manufacturing costs and a circuit area may be reduced by commonly using a common detection resistor detecting a current flowing in each of the LEDs.