Semiconductor Device Overcurrent Protection Circuit
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Solution Overview
Problem
Semiconductor devices face durability issues due to uneven voltage distribution across PN junction diodes, leading to potential overload and degradation when handling overcurrents, which can result in failure to protect Schottky barrier diodes effectively.
Innovation Solution
Incorporating a series connection of PN junction diodes with negative temperature characteristics and resistance elements in parallel, along with a Schottky barrier diode having a positive temperature characteristic, to ensure uniform voltage distribution and enhance durability against overcurrents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three series-connected PN junction diodes are connected to a Schottky barrier diode in parallel for overcurrent protection, then the Schottky barrier diode is protected from overcurrent, but uneven voltage distribution causes durability issues and potential overload on individual PN junction diodes
Solution Approach 1:
The patent introduces individual resistance elements connected in parallel with each PN junction diode. These resistance elements have different resistance values tailored to each diode's characteristics, creating local quality differences that compensate for manufacturing variations. This ensures uniform voltage distribution across all PN junction diodes during overcurrent events, preventing overload on any single diode while maintaining reliable protection of the Schottky barrier diode.
2Reliability
If multiple PN junction diodes are used in series to protect the Schottky barrier diode, then overcurrent protection is achieved, but the device size increases and density decreases
Solution Approach 1:
The patent optimizes the resistance values of the individual resistance elements based on the specific electrical characteristics of each PN junction diode. By carefully selecting resistance parameters, the circuit achieves effective overcurrent protection with minimal additional components. The resistance elements compensate for voltage distribution issues without requiring additional series diodes, thereby maintaining compact device size and high density while ensuring reliable 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 effectively reduces the risk of overload on individual PN junction diodes, improving the semiconductor device's durability and enabling size reduction while maintaining high density and efficient overcurrent protection.
Implementation Method 1
a plurality of PN junction diodes each having a negative temperature characteristic
Implementation Method 2
a Schottky barrier diode having a positive temperature characteristic
Data Source
AI summary
Provided is a semiconductor device including, a plurality of PN junction diodes each having a negative temperature characteristic and connected to each other in series; a plurality of resistance elements connected respectively to the PN junction diodes in parallel and connected to each other in series; and a Schottky barrier diode having a positive temperature characteristic and connected to the PN junction diodes in parallel.