GaN Gate Driver Circuit With UART Daisy-Chain Reprogramming
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Solution Overview
Problem
Existing gate driver circuits for GaN transistors lack a reliable mechanism for programming and re-programming, especially in the presence of electromagnetic noise and other disturbances, and do not efficiently manage gate control parameters across multiple circuits.
Innovation Solution
A gate driver circuit with an asynchronous serial communication interface that allows for reliable programming and re-programming of GaN transistors, even in noisy environments, and enables efficient communication and parameter management across multiple gate driver circuits using daisy-chaining and digital isolators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous serial communication interface (e.g., I2C) is used for programming gate driver circuits, then communication reliability is improved, but device complexity and pin requirements increase
Solution Approach 1:
The patent extracts the clock synchronization function from the communication interface, using an asynchronous serial interface that does not require a shared clock signal. This eliminates the need for continuous synchronization while maintaining communication reliability, thereby reducing device complexity and pin requirements.
Solution Approach 2:
The patent introduces a communication interface that acts as an intermediary between the external control circuit and the gate driver circuit. This interface uses asynchronous serial communication with start and stop bits to ensure reliable data transmission without requiring complex synchronous protocols, thus balancing reliability and simplicity.
2Device complexity
If daisy-chaining gate driver circuits is implemented, then the number of external control circuit pins is reduced, but communication reliability in noisy environments deteriorates
Solution Approach 1:
The patent applies error detection and correction mechanisms beforehand in the communication protocol to cushion against electromagnetic noise and disturbances. This allows daisy-chaining to be implemented reliably by preventing communication errors before they can propagate through the chain.
Solution Approach 2:
The patent implements feedback mechanisms in the communication interface to verify data integrity during daisy-chained transmission. This ensures that even in noisy environments, the external control circuit can detect and correct errors, maintaining reliability while reducing pin requirements through daisy-chaining.
3Adaptability or versatility
If gate driver circuits are made re-programmable, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent makes the gate driver circuit dynamic by enabling re-programming of gate driver parameters through the communication interface. This allows the circuit to adapt to different GaN transistor characteristics and operating conditions without increasing fundamental device complexity, as the programmability is achieved through software/firmware rather than hardware changes.
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AI summary
A gate driver circuit and a corresponding gate driver system is presented. The gate driver circuit may be configured to drive a gallium nitride GaN transistor. The gate driver circuit may comprise a communication interface configured to receive a gate driver parameter. The communication interface may be an asynchronous serial communication interface, such as e.g. an UART communication interface. The gate driver parameter may be forwarded from one gate driver circuit to the next using the asynchronous serial communication protocol. One or more digital isolators may be coupled between the gate driver circuits.