Galvanic Isolation in LED Power Converter Control
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Solution Overview
Problem
Existing lighting technologies, particularly in LED and emergency lighting, require galvanic isolation similar to electronic transformers, but existing solutions are complex and require trained specialists for installation, as they need to operate at a potential isolated from the mains supply voltage.
Innovation Solution
A system with a power converter stage supplied with AC voltage and a control unit that uses galvanic isolation to control switches via PWM signals, allowing feedback signals to be evaluated for controlling the lighting means, with the entire regulation and control logic located on the secondary side of the galvanic isolation, enabling simplified installation and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If galvanic isolation is implemented using existing transformer-based solutions, then safety and potential isolation are improved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent combines the galvanic isolation function with the power conversion function into a single integrated power supply unit. The control electronics are integrated onto the secondary side of the isolation transformer, eliminating the need for separate isolation components and reducing overall system complexity while maintaining galvanic isolation.
Solution Approach 2:
The patent uses a dedicated isolation barrier that allows signal transmission between primary and secondary sides while maintaining galvanic isolation. This intermediary structure enables control signals and feedback to pass through the isolation boundary without compromising safety or requiring complex external isolation circuits.
2Reliability
If galvanic isolation is implemented using existing transformer-based solutions, then safety and potential isolation are improved, but ease of operation and installation improve for non-specialists
Solution Approach 1:
By integrating all control electronics and power conversion into a single self-contained unit with internal galvanic isolation, the system becomes a plug-and-play device that can be installed and operated by non-specialists without requiring complex wiring or configuration.
Solution Approach 2:
The isolated control electronics on the secondary side autonomously manage the lighting control functions without requiring external isolation equipment or specialized installation knowledge. The system self-contained nature enables easy operation by end users.
3Reliability
If control electronics are placed on the secondary side of galvanic isolation, then safety is improved, but feedback signal transmission becomes more complex
Solution Approach 1:
The patent implements an isolation barrier with integrated signal transmission capability that allows feedback signals from the secondary side to be transmitted back to the primary side control while maintaining galvanic isolation. This intermediary structure simplifies feedback signal transmission compared to external isolation solutions.
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
This solution provides galvanic isolation for lighting systems without the need for trained specialists, allowing for efficient control and operation of LEDs and other light sources, reducing complexity and increasing safety in installation and maintenance.
Implementation Method 1
The control signal st1 of the first switch S1 is connected to the control unit C1 via a galvanic isolation G2
Implementation Method 2
G1 and G2 can be transformers. The transformers G1, G2 can be wound onto the same core.
Data Source
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AI summary
The invention relates to an operating device for operating a light source, in particular an LED, comprising: a first mains-supplied power converter stage (P1) with a first reference potential (Z1), a second power converter stage (P2) with a second reference potential (Z2) which is connected to the secondary side of the first power converter stage (P1) via a first galvanic isolation unit (G1), a preferably digital control unit (C1) which controls the first power converter stage (P1) and the second power converter stage (P2) without galvanic isolation via a second galvanic isolation unit (G2), at least one power switch (S2) which clocks the converter stage (P2), and a light source (L) which is supplied with energy by the second converter stage (P2).