Electrothermal Level Shift Circuit for Noise Isolation
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Solution Overview
Problem
Existing level shift circuits, such as HVICs, photocouplers, and micro-transformers, face challenges in miniaturization and cost-effectiveness due to electrical insulation issues and multi-chip configurations, leading to noise transmission and high costs.
Innovation Solution
A level shift circuit utilizing an electrothermal converter that converts electric signals to heat and a thermoelectric converter to transmit heat between different reference potentials, with an insulating region to prevent noise transmission and enable single-chip integration and low-cost semiconductor processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HVIC is used for level shifting, then signal transmission is achieved, but noise transmits from high-potential side to low-potential side due to lack of electrical insulation
Solution Approach 1:
The patent introduces an intermediary substance (insulating oil or gas) filled in the casing to provide electrical insulation between the high-potential side and low-potential side. This mediator prevents noise transmission while maintaining signal transmission capability, resolving the contradiction between noise isolation and device complexity
Solution Approach 2:
The patent divides the internal space into distinct high-potential and low-potential regions separated by insulating structures and the intermediary substance. This segmentation achieves electrical insulation and noise isolation without requiring complex external insulation structures
2Reliability
If photocoupler is used for level shifting, then electrical insulation is achieved, but miniaturization is difficult due to 2-chip configuration
Solution Approach 1:
The patent merges the light-emitting device and light-receiving device into a single integrated structure within one chip, eliminating the need for separate chips and complex packaging. This integration maintains electrical insulation while enabling miniaturization, resolving the contradiction between insulation reliability and device size
Solution Approach 2:
The patent arranges the light-emitting and light-receiving devices in close proximity within the same chip plane, using spatial arrangement in another dimension to achieve both insulation and compactness, avoiding the vertical stacking or separate chip configuration
3Reliability
If micro-transformer is used for level shifting, then signal transmission is achieved, but miniaturization is difficult and cost increases due to multi-chip configuration
Solution Approach 1:
The patent combines multiple functional devices (light-emitting device, light-receiving device, and associated circuits) into a single integrated chip structure. This merging eliminates the need for multiple discrete chips and complex assembly processes, reducing manufacturing cost while maintaining signal transmission reliability
Solution Approach 2:
The integrated chip structure performs multiple functions (signal transmission, electrical insulation, level shifting) within a single device, eliminating the need for separate components and reducing overall system complexity and manufacturing cost
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 solution achieves electrical insulation between high and low-potential sides, allowing for miniaturization and cost-effective implementation while preventing noise transmission, enabling efficient signal transmission and integration.
Implementation Method 1
an electrothermal converter converting a first electric signal with a first reference potential as a reference to heat
Implementation Method 2
a thermoelectric converter converting the heat from the electrothermal converter to a second electric signal with a second reference potential which is different from the first reference potential as a reference
Data Source
AI summary
A level shift circuit includes: an electrothermal converter converting a first electric signal with a first reference potential as a reference to heat; a thermoelectric converter converting the heat from the electrothermal converter to a second electric signal with a second reference potential which is different from the first reference potential as a reference; and an insulating region electrically insulating the electrothermal converter from the thermoelectric converter.