LED Control Circuit Residual Voltage Buffering
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Solution Overview
Problem
LED lighting apparatuses face issues with stable current flow and potential damage due to overvoltage from unstable power systems, leading to reduced lifetime and reliability, especially in high-capacity designs.
Innovation Solution
A control circuit with a current control circuit and a residual voltage buffer circuit that manages current paths for LED channels and absorbs excess voltage, preventing heat generation and damage by buffering residual voltage outside the integrated circuit chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the LED lighting apparatus is driven by higher voltage than design value due to unstable power system, then the power system compatibility is improved, but the current control circuit may be damaged by over current and thermal stress
Solution Approach 1:
The residual voltage buffer circuit is designed to absorb excessive voltage before it reaches the current control circuit. When the rectified voltage exceeds the preset value due to unstable power system, the buffer circuit activates to cushion the voltage spike, preventing over current from damaging the current control circuit and integrated circuit chip.
Solution Approach 2:
The residual voltage buffer circuit acts as an intermediary component between the power supply unit and the current control circuit. It mediates the voltage transmission by buffering residual voltage, thereby protecting the current control circuit from direct exposure to harmful over voltage while maintaining normal operation.
2Device complexity
If the residual voltage is not buffered, then the circuit simplicity is maintained, but heat generation in integrated circuit chip occurs due to over voltage
Solution Approach 1:
The harmful residual voltage is extracted and isolated from the main circuit by the buffer circuit. The buffer circuit specifically targets and removes the excessive voltage component that would otherwise generate heat in the integrated circuit chip, separating the harmful element from the functional circuit.
3Reliability
If additional circuits are added to protect against over voltage, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The residual voltage buffer circuit is designed with multi-functionality to minimize added complexity. It serves multiple purposes: buffering residual voltage, preventing over current, protecting the current control circuit, and maintaining stable LED operation. This universal approach allows one component to address multiple reliability concerns without proportionally increasing circuit 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
Ensures stable current flow and prevents part damage and thermal stress, enhancing the lifetime and reliability of LED lighting apparatuses, particularly in high-capacity designs by managing overvoltage and residual voltage effectively.
Implementation Method 1
a residual voltage buffer circuit configured to correspond to an LED channel which finally emits light, and buffer a residual voltage when the rectified voltage rises to a preset value such that the residual voltage occurs
Implementation Method 2
a current control circuit configured to provide a current path corresponding to sequential light emissions of the LED channels in response to a rectified voltage
Data Source
AI summary
A control circuit of an LED lighting apparatus divided into a plurality of LED channels may include: a current control circuit configured to provide a current path corresponding to sequential light emissions of the LED channels in response to a rectified voltage; and a residual voltage buffer circuit configured to correspond to an LED channel which finally emits light, and buffer a residual voltage when the rectified voltage rises to a preset value such that the residual voltage occurs.