Power Semiconductor Protection via Nested Sensor Placement
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Solution Overview
Problem
Existing protection arrangements for power semiconductor components fail to reliably prevent destruction due to overcurrent and overtemperature, especially in high power densities and dynamic processes, as they struggle to accurately detect peak temperatures and power distribution, leading to potential local overheating and 'hot spots'.
Innovation Solution
A protection arrangement is implemented with current and temperature sensors, where the current sense transistor and temperature sensor are placed between cells, and the current sense resistor is positioned directly above individual cells, allowing for precise temperature and current monitoring and dynamic power regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional protection arrangements with separate sensors are used, then the power semiconductor component can be protected against overcurrent and overtemperature, but the measurement precision of peak temperature and power distribution is insufficient, leading to potential local overheating
Solution Approach 1:
The temperature sensor and current sensor are integrated directly into the power semiconductor component structure, with sensors nested within or on the power cells. This allows the sensors to be positioned at critical locations for accurate measurement of peak temperatures and power distribution, resolving the contradiction between measurement precision and protection reliability.
Solution Approach 2:
Temperature sensors are positioned as intermediaries between the power cells and the external environment, directly measuring the temperature at critical locations within the component. This intermediary positioning enables accurate detection of peak temperatures and power distribution, improving both measurement precision and protection reliability.
2Measurement precision
If sensors are placed outside the power semiconductor component, then the component structure remains simple, but the sensors cannot accurately detect peak temperatures and local power distribution
Solution Approach 1:
The sensors are nested within the power semiconductor component structure, with temperature sensors positioned in gaps between power cells and current sensors integrated into the cell structure. This nesting approach enables accurate detection of local power distribution and peak temperatures while maintaining a compact and relatively simple overall component structure.
Solution Approach 2:
Different regions of the power semiconductor component are equipped with different sensor types positioned at specific locations. Temperature sensors are placed in gaps between cells where thermal gradients are most significant, while current sensors are integrated into individual cells. This local quality approach ensures accurate measurement of power distribution and temperature without requiring complex overall restructuring.
3Reliability
If multiple sensors are integrated into the power semiconductor component, then accurate monitoring of temperature gradients and current distribution is achieved, but the device complexity increases
Solution Approach 1:
Multiple sensors are nested within the power semiconductor component in a structured manner, with temperature sensors positioned in gaps between power cells and current sensors integrated into the cell structure. This systematic nesting approach enables reliable monitoring of temperature gradients and current distribution while managing device complexity through organized integration.
Solution Approach 2:
The sensor integration structure serves multiple functions: temperature sensing, current sensing, and structural support. The gaps between power cells are utilized as positioning locations for temperature sensors, while the same structural framework supports current sensors in the power cells. This multi-functionality approach improves protection reliability without proportionally increasing device complexity.
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 local overheating and ensures safe operation of power semiconductor components by accurately monitoring temperature gradients and current distribution, preventing destruction and allowing for efficient power management.
Implementation Method 1
a current sensor made of a current sense transistor and a sense resistor device lying in the source line of the sense transistor
Implementation Method 2
a temperature sensor
Data Source
AI summary
A protection arrangement for a power semiconductor component made of a plurality of cells, in which a current sensor made of a current sense transistor and current sense resistors and also a temperature sensor, is disclosed. The current sense transistor and the temperature sensor are provided in a gap or in different gaps between the cells, while the current sense resistor is fitted directly on at least one cell. The temperature sensor may, include a plurality of stages which are located from the center of the power semiconductor component to an edge of the latter in the gap between two cells.