GaN Bridge Gate Driving for Precise Soft-Switch Turn-On Timing
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Solution Overview
Problem
Conventional power converters using GaN HEMT devices face challenges in achieving accurate timing control, which is essential for high-frequency operation, and existing solutions are either expensive or lacking in performance.
Innovation Solution
A bridge configuration with GaN High Electron Mobility Transistors and a Gate driver that provides an asymmetrical turn-on signal, utilizing the Miller effect in soft-switched converters to ensure precise timing, and a universal gate driver capable of driving multiple GaN HEMT types with independent turn-on and turn-off capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If GaN HEMT devices are used to increase switching frequency, then productivity is improved, but manufacturing precision deteriorates due to the need for 10× increase in Gate drive timing accuracy
Solution Approach 1:
The patent changes the timing parameter by introducing a delay between the gate drive signal and the actual switch turn-on. The gate drive signal is provided at a first time, and the switch turns on at a second time that is delayed relative to the first time. This parameter change allows the system to operate at high switching frequencies while maintaining accurate effective timing control.
Solution Approach 2:
The gate drive signal is provided in advance at a first time before the actual switch turn-on occurs at the second time. This preliminary action allows the system to prepare the gate drive signal with sufficient timing accuracy while the actual switching event occurs at the precisely needed moment, resolving the contradiction between high frequency operation and timing accuracy.
2Device complexity
If conventional Gate drive timing control is used with GaN HEMT devices, then device complexity is reduced, but measurement precision deteriorates due to inability to achieve accurate timing control
Solution Approach 1:
The patent introduces dynamic timing control where the switch turn-on time is deliberately delayed relative to the gate drive signal. This dynamic relationship between the gate drive signal time and the actual turn-on time allows precise control of the effective switching moment while keeping the Gate drive control structure relatively simple.
Solution Approach 2:
The patent separates the gate drive signal provision from the actual switch turn-on event in time, creating a temporal dimension for timing control. By providing the gate drive signal at a first time and achieving turn-on at a second time, the system gains an additional degree of freedom for precise timing control without complicating the Gate drive 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
The solution achieves low-cost, high-performance timing accuracy for GaN HEMT devices, enabling efficient operation in soft-switched converters and reducing engineering costs by supporting multiple GaN HEMT types on a single PCB design.
Implementation Method 1
leveraging the Miller effect in soft-switched converters to ensure precise turn-on timing
Data Source
AI summary
A bridge configured for use with a power converter is provided herein. For example, a switch can include a Gallium-Nitride (GaN) High Electron Mobility Transistor and a Gate driver coupled to the Gallium-Nitride (GaN) High Electron Mobility Transistor and can be configured to provide a turn on signal to the Gallium-Nitride (GaN) High Electron Mobility Transistor at a first time so that the Gallium-Nitride (GaN) High Electron Mobility Transistor turns on at a second time that is different from the first time.