Optocoupler With Common Conductive Pad For High Voltage Isolation
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Solution Overview
Problem
Galvanic isolators, particularly optocouplers, face limitations in noise shielding and energy efficiency when used across circuits operating at different voltages, especially at high voltages, due to limitations in existing wireless and magnetic isolators, and challenges in packaging design for multi-channel optocouplers.
Innovation Solution
The design of an optocoupler with an optical transmitter die and receiver die attached to a common conductive pad, using a thin layer of insulating materials for isolation and thermal management, and employing a double encapsulant design to minimize light loss and enhance heat dissipation, while allowing for efficient signal transfer through light waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-channel optocoupler uses multiple optical transmitter and receiver dies, then the signal transmission capability between circuits operating at different voltages is improved, but the packaging complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple optical transmitter dies and receiver dies are integrated onto a single substrate, combining multiple independent optocoupler channels into one unified package. This merging approach enables multi-channel signal transmission between circuits operating at different voltages while consolidating what would otherwise be separate components, thereby reducing overall system complexity and improving adaptability.
2Reliability
If traditional galvanic isolators are used for high voltage isolation, then voltage isolation is achieved, but noise shielding capability is insufficient
Solution Approach 1:
Optical signals serve as an intermediary medium between circuits operating at different voltage potentials. Instead of direct electrical connection that provides voltage isolation but poor noise shielding, the patent uses light waves to transmit signals across the isolation barrier, achieving both high voltage isolation and superior noise shielding since optical signals are immune to electromagnetic interference.
3Object-affected harmful factors
If optocouplers are used for signal transmission, then noise shielding is improved, but energy efficiency deteriorates due to light wave transmission losses
Solution Approach 1:
The patent optimizes optical transmission parameters including light wavelength selection, transmitter output intensity, and receiver sensitivity to minimize energy loss. By carefully controlling these parameters, the system achieves efficient energy transfer through optical signals while maintaining superior noise shielding capabilities, resolving the contradiction between energy efficiency and noise protection.
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 configuration provides effective voltage and noise isolation, reduces energy loss, and enhances thermal conductivity, resulting in a more efficient and reliable optocoupler for high-voltage applications with improved packaging efficiency and reduced manufacturing costs.
Implementation Method 1
an optocoupler in which the signal is transfer through light waves
Implementation Method 2
an optocoupler comprises an optical transmitter die and an optical receiver die
Data Source
AI summary
An optocoupler with optical transmitter and receiver dies attached to a single conductive pad is presented. One of the optical transmitter and receiver dies may be attached directly to the conductive pad, while the other one of the optical transmitter and receiver dies may be attached to the conductive pad by means of three layers of materials comprising an isolation layer sandwiched between two attachment layers. A multi-channel optocoupler with multiple transmitter and/or receiver dies is also presented, in which one of the optical transmitter and receiver dies may be attached directly to the conductive pad. The other optical transmitter or receiver dies may be attached to the conductive pad by means of three layers of materials comprising an isolation layer sandwiched between two attachment layers.