Waveguide-Based Galvanic Isolation for Power Switching Devices
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Solution Overview
Problem
High-voltage and high-current power electronics devices face challenges in minimizing size, weight, and cost while maintaining efficiency, and are susceptible to electromagnetic interference (EMI) due to the need for separate gate drive units and power supplies, which can lead to unwanted activation and increased complexity.
Innovation Solution
A power electronics arrangement using a waveguide to transmit both logic and power signals, either optically or via radio frequency (RF), to isolate the control stage from the switching stage, eliminating the need for separate gate drive units and power supplies, and incorporating a receiver, filter, and converter (RFC) to generate switching and power signals for power switching devices (PSD), thereby reducing part count, weight, and size while being immune to EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate gate drive units and power supplies are used for power switching devices, then the devices can be controlled reliably, but the system size, weight, and complexity increase
Solution Approach 1:
The patent combines the gate drive unit and power supply into a single integrated controller that communicates with power switching devices through a waveguide. The controller generates both control signals and power signals, eliminating the need for separate gate drive units and external power supplies for each device, thus reducing system complexity while maintaining reliable operation through unified control architecture
Solution Approach 2:
The controller is designed as a multi-functional device that performs both control signal generation and power signal generation. It can control multiple power switching devices (including high-side and low-side switches) and provide power to them simultaneously through the waveguide interface, reducing the overall number of components needed in the system
2Ease of operation
If separate gate drive units are used for each power switching device, then precise control is achieved, but the number of components and system weight increase
Solution Approach 1:
Multiple gate drive functions are merged into a single controller that communicates with all power switching devices through the waveguide interface. The controller generates individual control signals for each device (including high-side and low-side switches) while sharing a common power supply and communication channel, thereby reducing system weight while maintaining precise control capability
3Use of energy by moving object
If traditional electrical connections are used between controller and power devices, then power and signals can be transmitted, but electromagnetic interference causes unwanted activation
Solution Approach 1:
The waveguide serves as an intermediary medium between the controller and power switching devices, transmitting both control signals and power signals through a guided electromagnetic field. This intermediary structure isolates the electrical connections, preventing electromagnetic interference from causing unwanted activation while maintaining efficient signal and power transmission
Solution Approach 2:
The patent replaces traditional direct electrical connections with a waveguide-based transmission system. The waveguide uses guided electromagnetic waves to transmit signals and power, substituting the direct electrical pathway that is susceptible to interference, thereby eliminating the harmful effects of electromagnetic coupling between controller and power devices
4Power
If multiple separate power supplies are used for control and power stages, then adequate power delivery is ensured, but the system cost and manufacturing complexity increase
Solution Approach 1:
The patent merges the control power supply and device power supply into a single integrated power source within the controller. The controller generates both low-power control signals and high-power power signals from this unified supply, eliminating the need for multiple separate power supplies and reducing manufacturing complexity while ensuring adequate power delivery to all 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
This solution reduces the overall size, weight, and cost of power electronics systems by eliminating separate gate drive units and power supplies, while providing galvanic isolation to protect against EMI, ensuring reliable operation of high-voltage and high-current devices.
Implementation Method 1
The waveguide is configured to guide at least one of an optical signal and a radio frequency signal
Data Source
AI summary
A power electronics arrangement may comprise a power supply, a controller configured to receive a power from the power supply and generate an output signal, a waveguide, a receiver, filter, and converter (RFC) configured to receive the output signal via the waveguide, the RFC configured to generate a switching signal from the output signal, and a power switching device (PSD) configured to receive the switching signal from the RFC, wherein the controller transmits the output signal to the RFC through the waveguide via a transponder, the waveguide is coupled between the transponder and the RFC, and the PSD is galvanically isolated from the power supply.