Backgate Gate Driver Circuit for Higher Current Density
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Solution Overview
Problem
Current gate driver circuits face challenges in achieving higher output current per unit area, which is essential for reducing manufacturing costs and improving efficiency in power conversion and motor control applications.
Innovation Solution
The implementation of a gate driver device with a backgate structure, including a field effect transistor and a driver circuit that supplies a backgate drive signal, which increases the current-carrying capability per unit area by selectively applying an active voltage level to the backgate structure when the transistor is on, thereby reducing on-state resistance and leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gate driver circuit size is reduced to decrease manufacturing costs, then the chip area decreases, but the output current per unit area decreases
Solution Approach 1:
The patent applies parameter changes by introducing a backgate voltage to modify the electrical characteristics of the transistor. By adjusting the backgate voltage level, the channel conductivity is enhanced, which increases the output current capability per unit area without requiring additional chip area, thus resolving the contradiction between cost reduction and productivity maintenance
Solution Approach 2:
The patent implements dynamics by making the backgate voltage adjustable and controllable. The driver circuit dynamically adjusts the backgate voltage based on operating conditions to optimize the transistor's current-carrying capability, enabling the circuit to adapt its performance to maintain high output current density while keeping the chip area small
2Reliability
If a thin semiconductor film with dielectric isolation is used in SOI gate drivers, then leakage current is reduced and latch-up is prevented, but the output current per unit area is limited
Solution Approach 1:
The patent resolves this contradiction by changing the electrical parameter of the transistor through backgate voltage application. The backgate voltage modifies the channel properties to enhance current carrying capability while the thin film and dielectric isolation structure maintains low leakage current and prevents latch-up, thus achieving both high reliability and high productivity
Solution Approach 2:
The backgate structure serves multiple functions simultaneously: it enhances the output current capability, maintains low leakage current due to the dielectric isolation, and prevents latch-up effects. This multi-functionality allows the device to achieve both high reliability and high output current density within the same structure
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 enables higher output currents within a smaller chip area, enhancing the efficiency and reducing the adverse effects on leakage current and voltage blocking capability, thus addressing the need for more compact and cost-effective gate driver circuits.
Implementation Method 1
The first driver circuit supplies a first backgate drive signal to the first backgate structure... increases the current-carrying capability per unit area by selectively applying an active voltage level to the backgate structure... reducing on-state resistance
Data Source
AI summary
A gate driver device includes a first field effect transistor and a first driver circuit. The first field effect transistor includes a first gate electrode and a first backgate structure. The first driver circuit supplies a first backgate drive signal to the first backgate structure.