Current sink with bypass for an LED chain
The simplified current sink for LED chains addresses complexity and cost issues by using a shunt resistor and controllable resistor element for efficient and fast LED switching, reducing reliance on control diodes and minimizing power losses.
CA3301007A1Pending Publication Date: 2026-09-21DIEHL AEROSPACE GMBH
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Patent Information
- Application Number
- CA3301007
- Authority / Receiving Office
- CA · CA
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-24
- Filing Date
- 2026-02-05
- Publication Date
- 2026-09-21
AI Technical Summary
Technical Problem
Existing current sinks for LED chains are complex and costly, relying on numerous components like control diodes, leading to slow starting behavior and high power losses, especially in PWM modes.
Method used
A simplified current sink design using a shunt resistor, controllable resistor element, and a control unit to adjust bypass current, allowing for quick switching and independent voltage control, independent of control diode characteristics.
Benefits of technology
Enables fast and efficient current regulation with reduced component costs and power losses, facilitating quick LED switching and improved efficiency in LED devices.
✦ Generated by Eureka AI based on patent content.
Abstract
A current sink (22) contains two supply poles (28a,b) for a continuous DC voltage (UG) and a current path (30) connecting said supply poles that, during operation (B), carries a total current (IG), the following being connected in series in the current path (30): a connection (32) for the LED chain (20), a shunt resistor (36) for mapping the total current (IG) to a measurement voltage (UM), a switch (40) for opening or closing the current path (30), a controllable resistor element (42) containing a parallel connection comprising a load resistor (44) and a bypass path (46) containing a controllable current brake (48) for controlling a bypass current (IB) through the bypass path (46), and a control unit (60) to take the measurement voltage (UM) as a basis for controlling the current brake (48) in regard to the magnitude of the bypass current (IB) such that, when the switch (40) is closed, a predeterminable total current (IG) is produced in the current path (30). A light source (6) for a light device (4) of an aircraft (2) contains the current sink (22) and the LED chain (20) connected to the connection (32). A light device (4) for an aircraft (2) contains at least one light source (6a-c).
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