Multi-level LED lighting system with power-cycle-based current regulation
The multi-level current-sense network with optically-isolated MOSFET shunts and analogue power-cycle detection addresses the challenges of LED lighting systems by enabling infrastructure-free dimming and reducing complexity and cost, ensuring flicker-free operation and compliance with EMC standards.
WO2026139730A1PCT designated stage Publication Date: 2026-07-02TAHERI ARASH +2
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Patent Information
- Application Number
- PCT/IB2025/058283
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-02
AI Technical Summary
Technical Problem
Existing LED lighting systems face challenges in infrastructure-free dimming at medium-to-high power levels without digital controllers, leading to increased complexity, cost, electromagnetic interference, and flicker, and mechanical relays suffer from wear and limited electrical life.
Method used
A multi-level current-sense network with optically-isolated MOSFET shunts and an analogue power-cycle detector that responds to timed mains interruptions to adjust LED current levels, eliminating microcontrollers and mechanical relays.
Benefits of technology
Provides flicker-free, scalable, and cost-effective power management from 5 W to 300 W, meeting EMC and safety standards without additional wiring or digital components.
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Smart Images
Figure IB2025058283_02072026_PF_FP_ABST
Abstract
Abstract the embodiments herein provides a solid-state lighting apparatus and method enable multi-level power control of LED luminaires without digital controllers, data lines or mechanical relays. A constant-current driver feeds the LED load through a current-sense network that includes a fixed base resistor and at least one series step resistor. Each step resistor is bridged by an optically-isolated MOSFET shunt. An analogue detector recognises an AC-mains interruption of three-to-six seconds and, on each re-energisation, activates a further shunt in sequence, thereby lowering the effective sense resistance and increasing the regulated LED current. Zero-cross gating minimises electromagnetic interference. The architecture provides at least three discrete lighting levels over a 5 W-to-300 W range, delivers flicker-free output, and can be retrofitted into existing street, industrial or residential fixtures using only the native power wiring.
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