Isolated Gate Driver Communication for Fast Inverter Fault Response
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Solution Overview
Problem
Control of high voltage traction inverters for electric vehicles is challenging due to the need for signal relay from a high voltage domain to a low voltage domain, resulting in delayed control responses, especially when faults occur, as direct communication between gate drivers referenced to different common potentials is hindered by significant voltage differences.
Innovation Solution
A system comprising galvanically isolated dies with inductive, capacitive, or optical communication channels allows direct communication between gate drivers in the high voltage domain, enabling near real-time fault detection and control without relying on the low voltage domain microcontroller, using coils, capacitors, or optocouplers for communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal relay from high voltage domain to low voltage domain is used for control, then control is achieved, but control response time is delayed
Solution Approach 1:
The patent introduces a galvanic isolation barrier with integrated communication circuitry as an intermediary between high voltage and low voltage domains. This mediator enables direct communication while maintaining electrical isolation, thus achieving reliable control without the time delay associated with traditional relay methods through the microcontroller.
2Loss of time
If direct communication between gate drivers is implemented, then control synchronization is improved, but galvanic isolation requirements increase complexity
Solution Approach 1:
The patent merges the galvanic isolation function with the communication function into a single integrated structure. The communication circuitry is built directly on the isolation barrier, combining what would traditionally be separate components into one unified device, thereby reducing overall system complexity while enabling direct communication between gate drivers.
Solution Approach 2:
The galvanic isolation barrier serves multiple functions simultaneously: it provides electrical isolation between different voltage domains, enables bidirectional communication between gate drivers, and maintains reference voltage levels. This multi-functionality reduces the need for additional separate components, simplifying the overall device structure.
3Reliability
If galvanic isolation is implemented between dies, then voltage domain separation is achieved, but communication channel complexity increases
Solution Approach 1:
The patent introduces dedicated communication circuitry embedded within the galvanic isolation barrier as an intermediary mechanism. This mediator provides pre-fabricated communication pathways through the isolation layer, eliminating the need for complex external communication channels while maintaining robust voltage domain separation.
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 facilitates faster and more efficient communication and control between gate drivers, improving synchronization and fault response times by maintaining control within the high voltage domain, reducing lag times associated with indirect communication through the low voltage domain.
Implementation Method 1
the first connection element comprises a first coil and the second connection element comprises a second coil, wherein the communication channel is provided by the first and second coils being configured to provide an inductive communication channel through the galvanic isolation layer
Implementation Method 2
the first connection element and the second connection element comprise corresponding parts of an optocoupler arrangement, and thereby the communication channel comprises an optical communication channel
Implementation Method 3
the first connection element comprises a first capacitor arrangement and the second connection element comprises a second capacitor arrangement, wherein the communication channel comprises a capacitive communication channel further provided by one or more bondwires extending between the first capacitor arrangement and the second capacitor arrangement
Data Source
AI summary
A system comprising a first gate driver comprising: a first die including a first controller for controlling a gate of a first power switch; a second die arranged with the first die and galvanically isolated from the first die, the second die comprising communication circuitry; wherein the first die includes a first connection element and the second die includes a second connection element, wherein the first and second connection elements are configured to provide a communication channel between the galvanically isolated first die and second die; and wherein the second die comprises at least one communication terminal for coupling to a second gate driver comprising a second controller, the second controller for controlling a gate of a second power switch; wherein the communication channel provides for communication between the first controller and the second controller.