LED Driver Technologies for Lighting Applications
Summary
Light-emitting diodes require specialised power-conversion circuits to deliver stable current and voltage, ensuring optimal luminous efficacy, uniformity and longevity. LED drivers are broadly classified into two-stage architectures, which separate power-factor correction (PFC) and dc–dc regulation, and single-stage designs that integrate both functions. Common topologies include buck, boost, buck–boost, flyback, SEPIC and resonant converters. Modern implementations employ soft-switching techniques—zero-voltage switching or zero-current switching—to minimise losses and attain efficiencies above 90%. Digital control via pulse-width modulation enables flicker-free dimming, spectral tuning and adaptive thermal management. Integration of PFC, low total harmonic distortion and electromagnetic-interference suppression meets stringent grid-connection and lighting standards. Emerging trends encompass wide-bandgap semiconductors for higher power density, bidirectional converters for renewable energy integration and smart networking features for dynamic lumen control. These advances underpin global efforts to reduce energy consumption in commercial, industrial and urban illumination.
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LED Driver Technologies for Lighting Applications publication trend
The graph below shows the total number of articles in led driver technologies for lighting applications across all publications each year (not limited to Nature Index journals).
Technical terms
Power-Factor Correction: Technique to align input current with voltage waveform, improving efficiency and reducing harmonic distortion.
Soft-Switching: Method that achieves switching transitions at zero voltage or current to minimise losses and electromagnetic interference.
Pulse-Width Modulation (PWM): Control strategy that regulates output by varying the duty cycle of a switching signal.
Discontinuous-Conduction Mode (DCM): Operating mode where inductor current falls to zero each switching cycle, simplifying control and aiding PFC.
Bidirectional Converter: Power converter capable of energy flow in both directions, supporting functions such as battery charging and load driving.
Constant-Current Regulation: Driver mode that maintains a fixed LED current to ensure stable luminous output despite supply variations.
References
- LED Systems Applications and LED Driver Topologies: A Review. IEEE Access (2023).
- Developing an Integrated Soft-Switching Bidirectional DC/DC Converter for Solar-Powered LED Street Lighting. Sustainability (2023).
- Long Life Power Factor Corrected LED Driver with Capacitive Energy Mechanism for Street Light Applications. Sustainability (2023).
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