Galvanic Isolation Feedback for LED Modules
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Solution Overview
Problem
Existing LED module systems require complex and costly circuitry, including A/D converters and optocouplers, to transmit measurement signals from the secondary side to the primary side across an electrically insulating barrier, which increases effort and cost.
Innovation Solution
A module design utilizing a galvanically isolated converter with a secondary-side passive circuit that applies a test signal and monitors current changes, allowing the primary-side control circuit to detect measurement signals without a secondary-side voltage or current supply, using resistors and switching elements to activate and deactivate the supply path in a binary-permuted manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If A/D converters and optocouplers are used to transmit measurement signals across the barrier, then measurement signal transmission is achieved, but device complexity and cost increase
Solution Approach 1:
The invention extracts the A/D converter and optocoupler from the circuit, eliminating these complex components while maintaining measurement signal transmission functionality through a simplified direct coupling approach
Solution Approach 2:
The invention uses a resistor to create an electrical copy of the measurement signal that can be transmitted across the barrier without requiring complex conversion or isolation components
2Difficulty of detecting and measuring
If A/D converters and low-voltage power supplies are used on the secondary side, then measurement signal detection is enabled, but manufacturing cost and circuit effort increase
Solution Approach 1:
The invention removes the A/D converter and low-voltage power supply from the secondary side circuit, eliminating these costly components while preserving measurement capability through alternative means
Solution Approach 2:
The invention replaces the electronic measurement system (A/D converter, power supply) with a passive resistive measurement approach that is simpler and cheaper to manufacture
3Object-affected harmful factors
If the secondary side is operated with safety extra-low voltage, then user safety is improved, but the ability to use higher voltage on the primary side for control is limited
Solution Approach 1:
The invention introduces a resistor as an intermediary element that allows the primary side control circuit to access and measure secondary side electrical parameters without direct electrical connection, enabling high voltage control while maintaining safety isolation
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 reduces circuit complexity and cost by enabling efficient feedback of measurement signals across the barrier, allowing for accurate detection and extrapolation of resistance values without the need for A/D converters or low-voltage power supplies.
Implementation Method 1
a secondary-side passive circuit is provided, which is connected across the barrier in a supply path via a galvanically isolated converter to a primary-side control circuit
Data Source
AI summary
The invention relates to a module for operating at least one illuminant, preferably at least one LED, said module having at least one electrically insulating barrier, which separates a primary side that can be supplied, originating from a mains voltage, from a secondary side of the module, from which the at least one illuminant can preferably be supplied. A secondary-side passive circuit is provided, which is connected in a supply path to a primary-side control circuit across the barrier via a galvanically isolated converter. The primary-side control circuit is designed to apply a test signal with predetermined temporal development to the secondary-side passive circuit (via the converter) and simultaneously to monitor a measurement signal generated thereby on the secondary side and fed back into the supply path, more particularly to monitor an increase of current in the converter.