LED Driving Apparatus Rectifying Circuit Flickering
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Solution Overview
Problem
LED driving apparatuses without converter circuits face flickering issues due to inconsistent AC power supply, leading to non-emission times in LED arrays and increased heating due to current stress.
Innovation Solution
Incorporating a power supply circuit with a rectifying circuit and a compensation circuit to ensure a minimum voltage for LED arrays, along with a controller IC and current control circuit to manage current flow and reduce stress on the controller IC, thereby preventing flickering and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an LED driving apparatus operates without a converter circuit to reduce manufacturing costs and increase reliability, then manufacturing cost and complexity are reduced, but flickering occurs due to inconsistent AC power supply
Solution Approach 1:
The rectifying circuit performs preliminary conversion of AC power to DC power before it reaches the LED arrays, ensuring stable power supply conditions are established in advance. This prevents flickering by proactively converting the inconsistent AC power into consistent DC power, eliminating the need for complex converter circuits while maintaining reliability.
Solution Approach 2:
The rectifying circuit acts as an intermediary component between the AC power source and the LED arrays. It mediates the power conversion process by converting AC to DC power, thereby eliminating flickering without requiring the LED arrays to directly handle inconsistent AC power.
2Device complexity
If AC power is supplied directly to LED arrays without a converter circuit, then device complexity is reduced, but heating phenomenon increases due to current stress on the controller IC
Solution Approach 1:
The rectifying circuit performs preliminary power conversion before power reaches the controller IC and LED arrays. By converting AC to DC power in advance, the controller IC is protected from high current stress that would otherwise occur during AC power transitions, thereby reducing heat generation while maintaining simple circuit design.
3Device complexity
If the controller IC controls current flow directly without current control circuit, then device complexity is reduced, but current stress on controller IC increases causing heating
Solution Approach 1:
The current control circuit serves as an intermediary between the controller IC and the LED arrays. It handles the heavy current flow to the LED arrays while the controller IC only needs to provide control signals, thereby reducing current stress and heating on the controller IC without significantly increasing overall device complexity.
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 ensures constant operation of LED arrays by adjusting current flow based on voltage levels, eliminating flickering and reducing heat generation, thus enhancing the reliability and efficiency of the LED driving apparatus.
Implementation Method 1
a rectifying circuit configured to rectify alternating current (AC) power
Implementation Method 2
LEDs are semiconductor light emitting devices
Implementation Method 3
LEDs are semiconductor light emitting devices
Data Source
AI summary
A light emitting diode (LED) driving apparatus includes a power supply circuit configured to supply driving power to a plurality of LED arrays, a controller integrated circuit (IC) including a plurality of internal switches respectively connected to the plurality of LED arrays and configured to control a path of current flowing in the plurality of LED arrays by adjusting operations of the plurality of internal switches based on a magnitude of the driving power, and a current control circuit connected to an output terminal of a first LED array among the plurality of LED arrays and configured to adjust current flowing in the first LED array. The first LED array is constantly operated while the driving power is being supplied.