Illuminant Operating Device Surge Protection Bypass Circuit
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Solution Overview
Problem
Existing operating devices for illuminants, particularly those with isolated switching mode power supplies, face challenges in preventing excessive high voltages at output terminals due to voltage surges from power outages, lightning strikes, or inductive spikes, which can be exacerbated when LEDs are mounted on Metal Core Printed Circuit Boards.
Innovation Solution
The operating device incorporates bypass means, including capacitors and switching/blocking components like Zener diodes or Transient Voltage Suppression diodes, to divert current from output terminals to protective earth or neutral terminals when excessive voltages are detected, thereby suppressing high voltages and improving electromagnetic compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage surge protection is implemented using traditional grounding methods, then high voltage protection is improved, but electromagnetic interference and noise propagation worsen
Solution Approach 1:
The patent introduces a bypass circuit with capacitor and resistor as intermediary components between the output terminal and protective earth/neutral terminal. This intermediary path allows surge currents to be diverted without directly grounding the output, thereby protecting against high voltages while minimizing electromagnetic interference and noise propagation that would occur with direct grounding methods
Solution Approach 2:
The patent changes the protection mechanism from direct electrical connection (grounding) to a controlled impedance path using RC circuitry. By adjusting the capacitor and resistor values, the system transforms how surge currents are handled - allowing high voltage protection while controlling the electrical parameters to reduce electromagnetic radiation and interference
2Reliability
If bypass means with large capacity capacitors are used, then surge current bypass capability is improved, but device complexity increases
Solution Approach 1:
The bypass circuit is segmented into distinct functional components: a capacitor for energy storage and voltage filtering, a resistor for current limiting and damping, and switching/blocking means for controlled activation. This segmentation allows each component to be optimized independently while maintaining overall simplicity and reliability of the surge protection system
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 effectively prevents excessive high voltages at output terminals, ensuring the safety and reliability of the lighting device by efficiently bypassing surge currents, reducing electromagnetic interference, and minimizing losses during normal operation.
Implementation Method 1
bypass means that comprise at least one capacitor are provided to bypass a current from one of the output terminals to protective earth or a neutral terminal of the input terminals
Implementation Method 2
the bypass means can comprise at least one of a gas discharge tube, Zener diode, Transient Voltage Suppression diode and voltage-dependent resistor
Data Source
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AI summary
An operating device for an illuminant comprises input terminals (L, N) for being supplied with an AC voltage, output terminals (X1, X2) and a driving circuitry (1, 2) for driving the illuminant (3), when connected to the output terminals (X1, X2). In order to compensate an excessive high voltage between the output terminals (X1, X2) and the protective earth (PE) due to voltage surges at input terminals (L, N), bypass means (4) are provided to bypass a current from one of the output terminals (X1, X2) to protective earth (PE) and/or a neutral terminal (N) of the input terminals (L, N), wherein the bypass means (4) comprise at least one capacitor (C).