Linear Constant Current LED Driver Circuit for Voltage Fluctuation Compensation
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Solution Overview
Problem
Existing LED lighting technologies experience fluctuations in brightness due to voltage changes in linear power networks, leading to poor environmental lighting effects.
Innovation Solution
A circuit and method for linear constant current control, incorporating a linear network compensation module, triac dimmer detection module, reference module, over-temperature protection module, bleeder module, and constant-current driver module, which perform power compensation, detect temperature, and regulate current to maintain constant brightness despite voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If voltage fluctuation occurs in the linear power network, then the LED lamp brightness changes, but the environmental lighting effect deteriorates
Solution Approach 1:
The patent implements a feedback control mechanism where the circuit detects voltage fluctuations in the linear power network and automatically adjusts the current supplied to the LED lamp to compensate for these fluctuations. The control circuit monitors the input voltage and modulates the driving current accordingly, ensuring that the LED brightness remains constant despite voltage variations in the power network.
Solution Approach 2:
The patent changes the electrical parameters (current and voltage) dynamically to maintain constant LED brightness. By adjusting the driving current parameter in response to input voltage changes, the system compensates for power network fluctuations and maintains stable illumination, transforming the fixed-parameter approach into a variable-parameter control system.
2Reliability
If power compensation is performed for the input linear power network, then the input power remains constant despite voltage changes, but the circuit complexity increases
Solution Approach 1:
The patent introduces an intermediary control circuit that acts as a mediator between the fluctuating power network and the LED lamp. This control circuit receives the unstable input power, processes it through voltage detection and current regulation stages, and outputs a stabilized current to the LED, thereby isolating the LED from power network fluctuations without requiring direct modification of the power network itself.
Solution Approach 2:
The patent replaces complex mechanical power regulation mechanisms with electronic control circuitry. Instead of using mechanical transformers or variable autotransformers to regulate power, the system uses solid-state electronic components including operational amplifiers, transistors, and integrated circuits to achieve voltage compensation and current stabilization, thereby reducing mechanical complexity while maintaining reliability.
Data Source
AI summary
A circuit and method for linear constant current control for an LED lamp, and an LED device are provided. The power compensation for the input linear power network is performed. When the triac dimmer is connected into the AC linear power network, constant current bleed-off is performed on the current passing through. In the meanwhile, when the triac dimmer detection module detects that a dimmer is connected in, the corresponding bleeder current is switched off, thereby improving the efficiency of the system. In this way, the input power of the system remains basically unchanged as the input voltage changes, besides, the constant current output drives the LED lamp, such that it is solved the problem that in the existing LED lighting and driving technique, the brightness of the entire LED lamp would change in case of voltage fluctuation of the linear power network.