Gallium Nitride Transistors in Electrostatic Harvesters
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Solution Overview
Problem
Electrostatic harvester devices in remote locations face performance issues due to insufficient kinetic energy conversion and temperature instability, leading to transistor failure and inefficiency.
Innovation Solution
The use of gallium nitride or aluminum gallium nitride transistors with wider bandgaps and higher breakdown voltages in an electrostatic harvester device, which includes an inductor, variable capacitor, and semiconductor components, enhances temperature stability and allows for higher kinetic energy conversion by applying higher voltages and reducing partial electrical discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transistors are used in electrostatic harvester devices, then the device structure is simpler and easier to manufacture, but the kinetic energy conversion efficiency is insufficient and temperature stability deteriorates
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional silicon transistors to gallium nitride transistors, fundamentally changing the material parameter (bandgap) to achieve both higher kinetic energy conversion efficiency and improved temperature stability. The wider bandgap of gallium nitride enables operation at higher voltages and temperatures, directly resolving the contradiction between conversion efficiency and temperature stability.
Solution Approach 2:
The patent employs composite materials by integrating gallium nitride transistors with the electrostatic harvester device architecture, combining the advantages of high-voltage capability and temperature resistance of gallium nitride with the energy harvesting function of the electrostatic mechanism, thereby achieving both improved efficiency and reliability.
2Productivity
If higher voltage is applied to the variable capacitor to increase kinetic energy conversion, then the energy conversion efficiency improves, but the frequency of partial electrical discharge increases
Solution Approach 1:
The patent resolves this contradiction by changing the voltage threshold parameter through the use of gallium nitride transistors, which can withstand higher voltages without breaking down. This allows the system to operate at higher voltages for improved energy conversion while the superior breakdown voltage characteristics of gallium nitride prevent partial electrical discharge, eliminating the harmful effect.
Solution Approach 2:
The patent effectively makes the transistor more durable by using gallium nitride, which extends the operational life of the device under high-voltage conditions. The material's inherent resistance to electrical breakdown reduces the frequency of partial discharges, allowing sustained high-voltage operation without premature failure.
3Ease of manufacture
If conventional transistors are used, then the device is easier to manufacture, but the transistors fail due to insufficient kinetic energy conversion and temperature changes
Solution Approach 1:
The patent addresses this contradiction by changing the material parameter from silicon to gallium nitride, which inherently provides higher breakdown voltage and temperature stability. While gallium nitride fabrication is more complex, the parameter change enables the transistor to withstand the harsh conditions of electrostatic harvesting, dramatically reducing failure rates and improving reliability.
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 solution significantly increases kinetic energy conversion efficiency and reduces transistor failure rates by maintaining higher voltage stability and efficient energy transfer to energy storage devices, even under varying temperature conditions.
Implementation Method 1
Electrostatic harvester devices convert kinetic energy into electrical signals. The devices may include a variable capacitor that changes capacitance in response to physical stimulation, such as through physical separation of its conductive plates.
Implementation Method 2
The inductor is operable to receive and store electric charge.
Implementation Method 3
The gallium nitride or aluminum gallium nitride transistor has a wider bandgap which leads to better temperature stability. The gallium nitride or aluminum gallium nitride transistor also has a higher breakdown voltage.
Data Source
AI summary
An electrostatic harvester device for charging an energy storage device is provided. The electrostatic harvester device comprises an inductor, a variable capacitor device, a semiconductor device, and a plurality of transistors. The inductor is operable to receive electric charge and store the electric charge. The variable capacitor device is configured to receive electric charge from the inductor and to change capacitance in response to physical stimulation. The semiconductor device is operable to allow electric current to flow from the variable capacitor device. The transistors are operable to connect at least two of the aforementioned devices. At least one of the transistors comprises at least one of gallium nitride or aluminum gallium nitride.