Semiconductor Relay Structure for Ringing Noise and Gate Current Control
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Solution Overview
Problem
Existing semiconductor devices face challenges in controlling noise levels during voltage transitions, with ringing noise occurring predominantly when the voltage is turned on, and there is a need to reduce this noise while maintaining space efficiency and appropriate gate current control.
Innovation Solution
A semiconductor device design that includes a semiconductor layer with a first and second conductor separated by a relay portion, where the relay portion is made of a semiconductor with different conductivity types, allowing for varying current paths based on the direction of current flow, thereby controlling resistance and noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a diode and resistor circuit is disposed outside the semiconductor device to control noise, then the noise caused by ringing is reduced, but the space efficiency is reduced due to requiring at least one additional chip
Solution Approach 1:
The patent merges the noise control circuit (diode and resistor) with the semiconductor device by integrating it into the semiconductor layer. The relay portion with first and second conductivity type regions is formed within the same semiconductor layer as the functional elements, eliminating the need for external components and additional chips, thus maintaining space efficiency while achieving noise reduction
Solution Approach 2:
The patent introduces a relay portion with specific conductivity type regions as an intermediary structure within the semiconductor device. This relay portion acts as a built-in mediator that controls current paths during voltage transitions, enabling noise reduction through internal circuit design rather than external components
2Object-affected harmful factors
If resistance is increased to reduce ringing noise, then noise levels are reduced, but the gate current control capability is compromised
Solution Approach 1:
The patent implements dynamic resistance control through the relay portion with first and second conductivity type regions. The resistance changes dynamically based on the direction of current flow: when voltage is turned on, the circuit path includes both conductivity type regions providing higher resistance to suppress ringing; when voltage is turned off, the circuit path changes to provide lower resistance for proper gate current discharge. This dynamic behavior resolves the contradiction between noise reduction and gate current control
3Object-affected harmful factors
If a circuit with diode and resistors is used to selectively increase resistance, then noise is reduced, but the device complexity increases
Solution Approach 1:
The patent applies local quality by creating specific conductivity type regions (first conductivity type and second conductivity type) within the relay portion of the semiconductor layer. These localized regions with different electrical properties are strategically positioned to control current paths only during specific operating conditions (voltage turn-on/turn-off), achieving noise reduction without requiring complex external circuits
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 design effectively controls resistance and noise levels during voltage transitions by altering the number of current paths based on current direction, maintaining space efficiency and enabling precise gate current management.
Implementation Method 1
a relay portion that is formed on the semiconductor layer so as to straddle the first conductor and the second conductor and that is made of a semiconductor having a first conductivity type region and a second conductivity type region
Data Source
AI summary
A semiconductor device includes a semiconductor layer, a first conductor disposed on the semiconductor layer, a second conductor disposed on the semiconductor layer so as to be separated from the first conductor, a relay portion that is formed on the semiconductor layer so as to straddle the first conductor and the second conductor and that is made of a semiconductor having a first conductivity type region and a second conductivity type region, a first contact by which the first conductivity type region and the second conductivity type region are electrically connected to the first conductor, and a second contact that electrically connects the first conductivity type region of the relay portion and the second conductor together and that is insulated from the second conductivity type region.