Thermoelectric Generator Voltage Saturation via Layer Thickness
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Solution Overview
Problem
Conventional thermoelectric generators integrated into exhaust systems of internal combustion engines face damage due to exceeding the maximum permissible input voltage, requiring complex bypass solutions and additional components like parallel exhaust ducts and control systems.
Innovation Solution
The thermoelectric generator design includes n- and p-layers with adjustable thickness to ensure output voltage saturation occurs below the maximum permissible input voltage, eliminating the need for bypasses and control systems by coordinating layer thickness with the pn junction's generation and transport efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional thermoelectric generators are integrated into exhaust systems, then electrical energy can be generated from waste heat, but the output voltage exceeds the maximum permissible input voltage of electrical circuits causing damage
Solution Approach 1:
The patent changes the physical parameters of the thermoelectric generator by adjusting the thickness of n- and p-layers to control the output voltage characteristics. By optimizing layer thickness, the generator achieves voltage saturation below the maximum permissible input voltage of electrical circuits, preventing damage while maintaining energy generation efficiency.
2Reliability
If bypass solutions and control systems are added to prevent voltage damage, then electrical circuit safety is improved, but device complexity increases
Solution Approach 1:
The thermoelectric generator is designed to self-regulate its output voltage through optimized layer thickness. The generator inherently produces voltage saturation below the maximum permissible level without requiring external bypass solutions or control systems, eliminating additional components and reducing system complexity.
3Reliability
If layer thickness is optimized for voltage saturation, then electrical circuit compatibility is improved, but power generation efficiency for high temperature differences decreases
Solution Approach 1:
The patent applies different layer thicknesses to different regions of the thermoelectric generator based on local requirements. The n- and p-layers have optimized thicknesses that create voltage saturation characteristics suitable for electrical circuit compatibility while maintaining adequate power generation capability across operating conditions.
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 design prevents damage to electrical circuits and simplifies integration by maintaining stable output voltage, optimizing power generation for medium engine power ranges without altering the exhaust system's structure.
Implementation Method 1
The thermoelectric effect, also known as the Seebeck effect, describes the reversible interaction between temperature and electricity. The Seebeck stress is determined by: U seebeck = α ⋅δT with δT temperature difference between hot and cold side α - Seebeck coefficient or thermopower
Implementation Method 2
A temperature gradient is applied parallel (x-direction) to the boundary layer between at least one n- and p-layer. At least one pn junction is formed essentially along the entire, preferably longest, extent of the n layer(s) and the p layer(s)
Data Source
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AI summary
The invention relates to an arrangement comprising a thermo-electric generator having a hot side which absorbs heat from a heat source, a cold side which discharges heat to a heat sink, and electrical terminals for outputting electrical energy with an output voltage and an electric circuit with a maximum permissible input voltage, the inputs of which are connected to the electrical terminals of the thermo-electric generator. Such arrangements may be used, for example, in exhaust systems of motor vehicles for more efficient use of the energy. In order to provide such an arrangement, which can be connected to a heat source, in particular an exhaust system of an internal combustion engine, largely independently of the magnitude of the temperature difference between the hot and cold sides of the thermo-electric generator, it is proposed that the thermo-electric generator be configured in such a way that saturation of the output voltage occurs below the maximum permissible input voltage of the electric circuit, or when said maximum permissible input voltage is reached.