Wireless Power Module Gate Drive With SOH Aging Detection
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Solution Overview
Problem
There is a lack of commercially viable gate drivers for high-voltage SiC MOSFETs, particularly above 10 kV, due to manufacturing costs and design complexities, and existing solutions do not efficiently address the need for universal architecture for medium-voltage power modules compatible with SiC, GaN, and future Ga2O3 MOSFETs.
Innovation Solution
A wireless-enabled power module with a wireless power transfer (WPT) system and radio frequency (RF) communication, incorporating a state of health (SOH) circuit and aging detection feature, which uses a level searching circuit and pulse counting technique to monitor the state of power switches, enabling remote monitoring and control, and eliminating the need for high electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commercially available gate drivers are used for high-voltage SiC MOSFETs, then blocking voltage capability is improved, but manufacturing cost and design complexity increase disproportionately
Solution Approach 1:
The gate driver is divided into two isolated sections: a high-voltage section that interfaces with the SiC MOSFET and a low-voltage control section. This segmentation allows each section to be optimized independently, reducing overall design complexity while maintaining high blocking voltage capability through the isolated architecture.
Solution Approach 2:
An isolated power supply and signal isolation circuitry serve as intermediaries between the low-voltage control section and high-voltage power section. This intermediary approach enables voltage level translation and galvanic isolation, allowing standard low-voltage logic to control high-voltage devices without direct electrical connection, thus reducing design complexity.
2Reliability
If high-voltage isolation is implemented to separate high-voltage bus from low-voltage signal bus, then safety is improved, but device complexity and cost increase
Solution Approach 1:
The isolated power supply circuit performs multiple functions: it provides galvanic isolation for safety, enables voltage level translation between high-voltage and low-voltage domains, and supplies power to the high-voltage gate driver section. This multi-functionality reduces the need for separate isolation components, thereby reducing overall device complexity.
Solution Approach 2:
The isolated power supply is self-regulating and automatically adapts to the voltage requirements of the high-voltage section. The circuit includes built-in feedback mechanisms that maintain proper isolation and voltage levels without requiring complex external control circuitry, thus reducing device complexity while maintaining safety.
3Adaptability or versatility
If a universal architecture is designed to accommodate SiC, GaN, and future Ga2O3 MOSFETs, then adaptability is improved, but design complexity increases
Solution Approach 1:
The gate driver architecture is designed with universal characteristics that can accommodate different wide-bandgap semiconductor devices (SiC, GaN, and future Ga2O3 MOSFETs). The isolated power supply and gate drive circuitry are configured to accept a range of voltage inputs and can be adjusted for different device specifications, providing adaptability without requiring fundamentally different designs for each device type.
Solution Approach 2:
The gate driver includes adjustable parameters such as gate resistance, drive voltage levels, and switching frequencies that can be dynamically configured for different device types. This dynamic adjustability allows a single universal architecture to optimize performance for SiC, GaN, and future devices without increasing fundamental design complexity.
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 provides a cost-effective, flexible, and efficient power module that can operate at extremely high voltage levels, enabling remote monitoring and control, and is suitable for harsh environments, thus overcoming the limitations of existing gate drivers and power modules.
Implementation Method 1
wireless power transfer (WPT) systems
Data Source
AI summary
A power module that receives a control signal over a wireless connection with the power module using the control signal to generate a driving signal that drives one or more power switches is described. An aging detection feature for a power module is also described. The aging detection feature may employ a level searching circuit and a pulse counting technique that provides information about the state of health of one or more power switches. The information may include estimated values for on-state resistance and/or threshold voltage of one or more power switches.