Gate Driver IC Signal Port Reduction and Field Plate Design
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Solution Overview
Problem
High-voltage gate driver integrated circuits face challenges in reducing the number of signal ports and simplifying circuit design while maintaining high withstand voltage performance, due to complex designs and potential electric field aggregation issues.
Innovation Solution
The proposed gate driver integrated circuit incorporates a substrate with a drift region, field effect transistor, well regions, and a field plate structure, which reduces signal ports by allowing multiple signal lines to connect to a single port, and disperses electric fields to prevent aggregation, thereby enhancing withstand voltage performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple signal ports are provided for separate connections to source region, drain region, gate structure, well region, and field plate structure, then each component can be independently controlled, but the number of signal ports increases and circuit design becomes tedious
Solution Approach 1:
The patent merges multiple signal ports into a single signal port by electrically connecting the source region, well region, and field plate structure together. This allows a single control signal to simultaneously control the field effect transistor and the isolation structure, reducing the number of external connections while maintaining independent control functionality through internal electrical connections.
Solution Approach 2:
The first signal port serves multiple functions by being connected to the source region, well region, and field plate structure. This single port performs the roles of multiple separate ports, controlling both the switching operation of the field effect transistor and the isolation function of the well region and field plate structure simultaneously.
2Device complexity
If conventional structures are used without field plate structure, then the design is simpler, but electric field aggregation occurs and withstand voltage performance decreases
Solution Approach 1:
The field plate structure acts as an intermediary element between the gate structure and the drain region. It modifies the electric field distribution by introducing a conductive structure that extends over the drift region, preventing direct electric field lines from concentrating at critical points and thereby improving breakdown voltage without significantly complicating the overall device structure.
Solution Approach 2:
The field plate structure changes the electric field parameter distribution by introducing a new conductive element that alters the field lines' path and concentration. This modifies the electric field intensity and distribution pattern in the drift region, preventing aggregation and improving withstand voltage performance.
3Reliability
If field plate structure is added to disperse electric fields, then withstand voltage performance improves, but device complexity increases
Solution Approach 1:
The field plate structure is electrically merged with the source region and well region through the first signal port connection. This integration reduces the number of independent components and external connections needed, offsetting the structural complexity added by the field plate itself through simplified interconnections and control architecture.
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 effectively reduces the number of signal ports, simplifies the circuit layout, and improves high-voltage withstand capabilities, allowing the integrated circuit to handle voltages up to 700 V while preventing electric field-induced breakdowns.
Implementation Method 1
a field plate structure formed on the substrate and disposed between the source region and the drain region... disperses electric fields to prevent aggregation
Implementation Method 2
substrate having a drift region of a first doping type therein... field effect transistor including a drain region of the first doping type, a source region of the first doping type
Data Source
AI summary
A gate driver integrated circuit is provided. The gate driver integrated circuit includes a substrate having a drift region of a first doping type therein, and a field effect transistor including a drain region of the first doping type, a source region of the first doping type, and a gate structure. The gate driver integrated circuit also includes a first well region of a second doping type and a first contact region of the second doping type. Each of the first well region and the drain region is formed in the drift region, the source region is formed in the first well region, and an end portion of the gate structure near the source region covers a portion of the first well region. Further, the gate driver integrated circuit includes a field plate structure formed on the substrate and disposed between the source region and the drain region.