GaN Gate Driver Energy Harvesting for Integrated Power Switching
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Solution Overview
Problem
Conventional power conversion devices using silicon MOSFETs are limited by high size and low efficiency, and require external power supplies for gate drivers, which complicates integration and increases size and cost.
Innovation Solution
An integrated GaN power device with an energy harvesting gate driver circuit that stores energy from a PWM signal, eliminating the need for a separate power supply and allowing the gate driver to operate independently, thereby reducing size and increasing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external power supply is used for the gate driver, then the gate driver can operate reliably, but the device size and complexity increase
Solution Approach 1:
The patent merges the power supply function into the gate driver circuit by integrating an energy harvesting circuit that extracts power from the PWM input signal itself. This eliminates the need for a separate external power supply for the gate driver, reducing device complexity and integration requirements while maintaining reliable operation.
Solution Approach 2:
The PWM input signal serves dual purposes: it provides the control signal for transistor switching and simultaneously serves as the power source for the gate driver through the energy harvesting circuit. This multi-functionality reduces the number of external connections and simplifies the overall device architecture.
2Adaptability or versatility
If conventional silicon MOSFETs are used, then pin-to-pin compatibility is maintained, but efficiency is low and size is large
Solution Approach 1:
The patent changes the material parameter from silicon to gallium nitride (GaN), which fundamentally alters the electrical characteristics including electron mobility and breakdown voltage. This material substitution enables higher efficiency operation while maintaining the same external pin configuration for compatibility with existing silicon MOSFET applications.
3Ease of manufacture
If conventional silicon MOSFETs are used, then manufacturing is well-established, but device size and cost increase
Solution Approach 1:
By changing the semiconductor material from silicon to GaN, the device achieves higher power density, allowing the same power handling capability in a smaller physical footprint. The energy harvesting gate driver further contributes to size reduction by eliminating external power supply components.
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 integrated GaN power device achieves higher efficiency and lower size, enabling pin-to-pin compatibility with silicon MOSFETs and reducing parasitic elements, while maintaining safe operating conditions for the GaN transistor across varying voltage ranges.
Implementation Method 1
the gate driver circuit is arranged to store energy harvested from the input signal and use the stored energy to change a conductive state of the pull-down transistor
Data Source
AI summary
An electronic circuit is disclosed. The electronic circuit includes a transistor having a gate terminal, a source terminal and a drain terminal, and a gate driver circuit including a pull-down transistor coupled to the gate terminal, and an input terminal arranged to receive an input signal and generate a corresponding output signal at an output terminal coupled to the gate terminal, where the gate driver circuit is arranged to store energy harvested from the input signal and use the stored energy to change a conductive state of the pull-down transistor. In one aspect, the transistor includes gallium nitride (GaN). In another aspect, the pull-down transistor includes GaN.