High-Reverse-Voltage LED Pad Structure for Capacitance Control
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Solution Overview
Problem
Current lighting devices face issues with reverse voltage damage to light sources due to parasitic capacitance, leading to potential damage and reduced efficiency when using solutions like Zener diodes, isolated power supplies, or additional resistors.
Innovation Solution
A light-emitting diode with a complementary pad structure that increases distributed capacitance by designing positive and negative pads with extension portions forming accommodating spaces, creating capacitors in parallel with the light source, enhancing heat dissipation and reducing the need for additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Zener diode is added to the circuit, then reverse voltage protection is improved, but cost and luminous efficiency deteriorate
Solution Approach 1:
The patent combines the protective function with the existing pad structure by creating accommodating spaces within the pads themselves. The first extension portion is disposed within the accommodating space formed by the second extension portions, effectively integrating the protection mechanism into the structural design rather than adding separate components like Zener diodes.
Solution Approach 2:
The patent converts the harmful parasitic capacitance effect into a beneficial protective mechanism. By designing the pad structure to form accommodating spaces that create capacitive coupling, the parasitic capacitance becomes a deliberate feature that protects against reverse voltage rather than a harmful side effect.
2Reliability
If isolated power supply is added to the circuit, then reverse voltage protection is improved, but cost and power efficiency deteriorate
Solution Approach 1:
The protective function is merged into the pad structure itself through the accommodating space design. The first extension portion extending into the accommodating space creates the necessary capacitive effect without requiring separate power supply components.
Solution Approach 2:
The pad structure serves dual purposes: providing electrical connection and providing reverse voltage protection. The accommodating spaces in the pads automatically create the protective capacitive effect, making the structure self-protecting without external assistance.
3Reliability
If resistor or capacitor is added to the circuit, then reverse voltage protection is improved, but cost and luminous efficiency deteriorate
Solution Approach 1:
The patent merges the protective capacitive function into the pad structure by forming accommodating spaces within the pads. The first extension portion disposed in the accommodating space creates the necessary capacitance without adding separate resistors or capacitors to the circuit.
Solution Approach 2:
The patent transforms the typically harmful parasitic capacitance into a beneficial protective feature by deliberately designing the pad geometry to create accommodating spaces that form capacitors, thereby using capacitance for protection rather than viewing it as a nuisance.
4Temperature
If metal housing is used for heat dissipation, then heat dissipation is improved, but parasitic capacitance is generated causing reverse voltage
Solution Approach 1:
The patent converts the harmful parasitic capacitance generated by the metal housing into a beneficial protective feature. The accommodating spaces in the pad structure create controlled capacitive coupling that protects against reverse voltage, transforming the previously harmful effect into a protective mechanism.
Solution Approach 2:
The pad structure with accommodating spaces is designed in advance to counteract the reverse voltage effect. The first extension portion extending into the accommodating space pre-establishes the protective capacitive coupling before reverse voltage occurs, neutralizing the harmful effect proactively.
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
The complementary pad structure improves reliability and efficiency by preventing reverse voltage damage, extending the lifespan of the light-emitting diode without increasing costs, and enhancing heat dissipation.
Implementation Method 1
The second extension portions extend toward the positive pad to form an accommodating space between the second extension portions, and the first extension portion extends toward the accommodating space... creating capacitors in parallel with the light source, enhancing heat dissipation
Data Source
AI summary
A light-emitting diode with high reverse voltage tolerance includes a holder, a positive pad, a negative pad and a light source. The positive pad is disposed in the holder, and includes a first main body and a first extension portion connected to each other. The negative pad is disposed in the holder, and includes a second main body and two second extension portions connected to the second main body. The light source is disposed in the holder and electrically connected to the positive pad and the negative pad. The second extension portions extend toward the positive pad to form an accommodating space between the second extension portions, and the first extension portion extends toward the accommodating space.