Semiconductor Current Detection via Output Terminal Shielding
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Solution Overview
Problem
Existing semiconductor devices fail to accurately detect currents input to and output from power elements due to the magnetic field generated by current flow in conductive plates interfering with current sensors, making it difficult to measure the actual current input and output from the power elements.
Innovation Solution
A semiconductor device configuration where a current detection portion is fixed to an output terminal, allowing the magnetic field generated by the current flow to permeate and enabling accurate detection of currents input to and output from the power elements, while preventing electromagnetic noise interference using a shield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the current sensor is disposed in the vicinity of the conductor to detect current, then the current flow in the conductor can be detected, but the magnetic field generated by the conductor current interferes with the detection of the actual power element current
Solution Approach 1:
The current sensor is extracted from the vicinity of the conductor and relocated to the output terminal. This separation removes the sensor from the harmful magnetic field environment while maintaining its detection function. The sensor now detects current at a location where the magnetic field interference from the conductor is eliminated, thereby improving measurement precision without exposure to harmful magnetic factors.
2Ease of operation
If the conductor connects the power elements in a configuration that enables current flow, then the power elements can operate, but the magnetic field from the conductor prevents accurate current detection
Solution Approach 1:
The output terminal serves as an intermediary location for current detection. Instead of placing the sensor directly near the conductor (where magnetic interference occurs), the sensor is positioned at the output terminal which is electrically connected to the power elements but spatially separated from the conductor. This intermediary position allows the sensor to measure the current that flows through the power elements without being subjected to the conductor's magnetic field, thus maintaining ease of operation while improving measurement accuracy.
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
Enables accurate detection of currents input to and output from power elements by utilizing a current detection portion positioned at the output terminal, reducing the complexity and size of the device and maintaining detection accuracy despite external magnetic fields.
Implementation Method 1
a current detection portion that detects a current of the plurality of power elements based on a magnetic field generated by a flow of a current input to the plurality of power elements and a current output from the plurality of power elements
Data Source
AI summary
A semiconductor device includes: power elements that configures an inverter; a conductive plate that electrically connects the power elements; and a current detection portion. The power elements include a first power element and a second power element. The conductive plate includes: a first carrying portion; a second carrying portion; a third carrying portion; a fourth carrying portion; a first connection portion that electrically connects the second carrying portion and the third carrying portion to connect the first power element and the second power element in series; and an output terminal electrically connected with the second carrying portion or the third carrying portion. The first carrying portion is connected with a first power source and the fourth carrying portion is connected with a second power source. The current detection portion is fixed to the output terminal and the magnetic field permeates the current detection portion.