Hybrid Inverter Gate Control for Synchronized Multi-Phase Switching
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Solution Overview
Problem
Existing multi-phase power inverters for electric machines face challenges in synchronizing the switching events of semiconductor switches with different technologies, leading to issues such as overcurrent, overvoltage, and electromagnetic interference, which affect the efficiency and reliability of power conversion.
Innovation Solution
A gate drive system with a gate controller and gate drive circuits controls semiconductor switches in parallel or series, using different slew rates and synchronization to manage the switching delays of hybrid switch power modules, ensuring equivalent current conduction during ON/OFF transients and providing overcurrent and overvoltage protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor switches with different technologies are used in parallel or series, then the power conversion capability and efficiency are improved, but the synchronization of switching events becomes difficult leading to overcurrent, overvoltage, and electromagnetic interference
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gate voltage slew rate for different semiconductor switches based on their individual characteristics. The controller monitors switching events and modifies gate voltage parameters in real-time to achieve synchronized switching across hybrid switches with different technologies, thereby maintaining reliability while preserving power conversion efficiency.
Solution Approach 2:
The patent implements feedback mechanisms where the controller continuously monitors switching events, current, and voltage states of semiconductor switches. Based on this feedback, the controller adjusts gate drive signals to synchronize switching transitions, preventing overcurrent and overvoltage conditions while maintaining the benefits of using diverse semiconductor technologies.
2Productivity
If the switching speed is increased to improve power conversion speed, then the productivity is improved, but the second-order effects such as overvoltage spikes and electromagnetic interference increase
Solution Approach 1:
The patent applies dynamics by making the gate voltage slew rate adjustable rather than fixed. The controller dynamically selects appropriate slew rates based on operating conditions, allowing fast switching when needed while reducing electromagnetic interference when lower speeds are acceptable. This dynamic adjustment optimizes the trade-off between productivity and harmful effects.
Solution Approach 2:
The patent changes the gate voltage parameter (slew rate) to control the rate of change during switching transitions. By adjusting this parameter, the system achieves fast switching for high productivity while minimizing overvoltage spikes and electromagnetic interference, effectively resolving the contradiction between speed and harmful effects.
3Power
If the gate voltage is increased to ensure full conduction of semiconductor switches, then the power conversion capability is improved, but the risk of overvoltage and device stress increases
Solution Approach 1:
The patent applies parameter changes by using adjustable gate voltage levels and slew rates tailored to each semiconductor switch's characteristics. This ensures sufficient gate voltage for full conduction and optimal power conversion capability while controlling the rate of voltage change to minimize overvoltage spikes and reduce device stress.
Solution Approach 2:
The patent applies local quality by providing individualized gate drive parameters for each semiconductor switch based on its specific characteristics. This localized approach ensures each switch receives the appropriate gate voltage and slew rate needed for full conduction without excessive overvoltage stress, optimizing power capability while protecting devices.
Data Source
AI summary
A multi-phase power inverter coupled to an electric machine includes a gate drive system including a gate controller operatively connected to gate drive circuits and hybrid switch power modules. The hybrid switch power modules are integrated into phase legs of the inverter that couple to the electric machine via AC power links. Each hybrid switch power module includes a first semiconductor switch connected in parallel with a second semiconductor switch, wherein the first semiconductor switch has performance characteristics that differ from the second semiconductor switch. The gate drive circuit includes a gate driver, a first variable resistance circuit, and a second variable resistance circuit. The gate controller is connected to the gate drive circuit via a plurality of links. The gate controller generates control signals that are communicated to the gate drive circuit to control the hybrid switch power module via the links.