GaN Half-Bridge Receiver Input Reset Circuit
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Solution Overview
Problem
Current half bridge power conversion circuits using GaN-based semiconductor devices face challenges in efficiently managing high-frequency operations and preventing false triggering and shoot-through conditions, which affect the size and efficiency of power conversion circuits in electronic devices.
Innovation Solution
The proposed solution involves a half bridge GaN circuit design with integrated driver circuits, level shift transistors, and a receiver input reset circuit that controls the conductivity of high side and low side power switches based on input signals, preventing false triggering and optimizing voltage management through bootstrap capacitor charging and UVLO circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency operations are implemented in half bridge power conversion circuits using GaN-based semiconductor devices, then power conversion efficiency and speed are improved, but false triggering and shoot-through conditions occur more frequently
Solution Approach 1:
The receiver input reset circuit proactively resets the receiver input state before potential false triggering can occur. By anticipating the high-frequency switching transitions and resetting the receiver input accordingly, the circuit prevents false triggering conditions from developing, thus maintaining reliability while enabling high-frequency operation.
Solution Approach 2:
The receiver input reset circuit acts as an intermediary between the high-frequency switching signals and the power switch control. It mediates the control signals by ensuring proper timing and state management, preventing direct interference that could cause false triggering while allowing high-frequency operations to proceed.
2Productivity
If high-frequency operations are implemented in half bridge power conversion circuits, then power conversion efficiency is improved, but power dissipation increases
Solution Approach 1:
The receiver input reset circuit automatically manages its own operation based on the switching frequency and control signals. It self-regulates the resetting timing without requiring external intervention, ensuring optimal performance while minimizing additional power consumption. The circuit serves itself by using the existing control signal infrastructure to drive the reset function.
3Reliability
If integrated driver circuits and level shift transistors are added to the half bridge GaN circuit, then control precision and reliability are improved, but device complexity increases
Solution Approach 1:
The receiver input reset circuit is integrated directly into the existing driver circuitry rather than being implemented as a separate external component. By merging the reset function with the driver circuit, the patent achieves improved control precision and reliability while minimizing the increase in overall device complexity. The integrated approach allows shared use of existing transistors and signal paths.
Solution Approach 2:
The receiver input reset circuit is designed to work across multiple operating conditions and frequency ranges using the same basic circuit topology. By making the circuit universal rather than specialized, the patent avoids adding excessive complexity while maintaining high reliability. The same circuit structure handles various switching frequencies and load conditions without requiring additional components.
Data Source
AI summary
A half bridge GaN circuit is disclosed. The circuit includes a low side power switch, a high side power switch, and a high side power switch controller, configured to control the conductivity of the high sigh power switch based on the one or more input signals. The high side power switch controller includes a receiver input reset circuit configured to simultaneously receive first and second signals, wherein the first signal corresponds with the high side power switch being turned on, wherein the first signal corresponds with the high side power switch controller turning on the high side power switch, wherein the second signal corresponds with the high side power switch controller turning off the high side power switch, and wherein the receiver input reset circuit is further configured, in response to the first and second signals, to prevent the high side power switch from becoming non-conductive.