Resonant Power FET Gate for Fast Switching With Lower Heat
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Solution Overview
Problem
Power FETs face limitations in switching high currents at high speeds due to increased heat generation and the need for thermal management, which complicates integration with computational semiconductor die and increases system costs, while existing methods do not sufficiently reduce ON-resistance or eliminate the need for solder joints in mobile platforms.
Innovation Solution
A resonant transistor gate with integrated passive circuit elements forms a lumped RLC circuit or distributed network within the gate structure, using high-density dielectric materials to tune resonant frequencies and reduce input capacitance, allowing for monolithic integration of power management modules with high-speed, high-current capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transistor gate is made smaller to reduce gate capacitance and increase switching speed, then switching speed is improved, but heat generation increases due to higher current densities
Solution Approach 1:
The patent changes the electrical parameters of the gate by introducing resonant circuit elements (inductors and capacitors) that transform the gate's impedance characteristics. This allows the gate to operate at resonant frequencies where current flow is optimized, reducing resistive losses and heat generation while maintaining high switching speeds. The resonant frequency is determined by the LC circuit parameters, enabling speed control without simply reducing gate size.
Solution Approach 2:
The patent makes the gate structure dynamically responsive by incorporating tunable reactive elements that can be adjusted to match different operating frequencies. This dynamic adaptation allows the gate to maintain optimal performance across varying conditions, achieving high switching speeds only when needed while reducing heat generation during normal operation through resonant impedance matching.
2Power
If higher current levels are used to achieve high currents at high switching speeds, then current output is improved, but thermal management complexity increases
Solution Approach 1:
The patent converts the harmful effect of high current flow into a beneficial resonant phenomenon. By designing the gate as an LC resonant circuit, the high currents needed for power output flow through reactive elements that store and release energy cyclically, reducing resistive heating. The resonant current amplification achieves high power output without proportionally increasing heat generation, thereby simplifying thermal management requirements.
Solution Approach 2:
The patent employs periodic current flow characteristic of resonant circuits, where current oscillates at the resonant frequency. This periodic action allows energy to be delivered in controlled pulses rather than continuous high current, reducing average power dissipation and heat generation while maintaining peak current capability for high power output when needed.
3Speed
If discrete components are used to achieve high switching speeds, then switching performance is improved, but integration with computational die becomes difficult
Solution Approach 1:
The patent merges the discrete resonant circuit elements (inductors and capacitors) directly into the transistor gate structure, creating an integrated resonant gate device. This combination eliminates the need for separate discrete components while maintaining the resonant switching performance. The inductive and capacitive elements are formed as part of the gate electrode and insulation structure, enabling monolithic integration with computational die and simplifying manufacturing.
4Power
If the gate electrode is made larger to reduce ON-resistance, then current handling capability is improved, but gate capacitance increases reducing switching speed
Solution Approach 1:
The patent changes the electrical parameters of the gate by introducing resonant circuit elements (inductors and capacitors) that transform the gate's impedance characteristics. This allows the gate to operate at resonant frequencies where current flow is optimized, reducing resistive losses and heat generation while maintaining high switching speeds. The resonant frequency is determined by the LC circuit parameters, enabling speed control without simply reducing gate size.
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 approach enables efficient power management with reduced thermal management needs, lower ON-resistance, and the elimination of solder joints, enhancing the operational efficiency and reliability of power FETs in high-speed applications.
Implementation Method 1
the resonant gate is electromagnetically resonant at one or more predetermined frequencies
Implementation Method 2
using high-density dielectric materials to tune resonant frequencies and reduce input capacitance
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A semiconductor FET provides a resonant gate and source and drain electrodes, wherein the resonant gate is electromagnetically resonant at one or more predetermined frequencies.