Inverter Switch Control Patterns for Lower Switching Losses
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Solution Overview
Problem
Inverters in electric vehicle power systems face challenges with increased switching losses and thermal management issues due to higher battery voltages and switching frequencies, limiting performance and driving range.
Innovation Solution
A controller for an inverter that generates control signals to operate switches in first and second switching patterns, optimizing current paths and frequencies to minimize switching losses and thermal stress, using a configuration that reduces the number of gate driver units and floating capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If higher battery voltages and switching frequencies are used to improve power density, then power delivery capability is improved, but switching losses and thermal stress increase
Solution Approach 1:
The patent implements dynamic switching patterns that adapt to operating conditions. The controller selectively applies different switching strategies (first switching pattern vs second switching pattern) based on real-time requirements, allowing the system to optimize between power delivery and switching losses dynamically rather than using a fixed high-frequency approach
Solution Approach 2:
The patent changes the switching frequency parameter dynamically by implementing two distinct switching patterns. The first switching pattern uses higher frequency for improved power density when needed, while the second switching pattern uses lower frequency to reduce switching losses during other operating conditions, thus adapting the frequency parameter to balance performance and efficiency
2Power
If higher battery voltages and switching frequencies are used to improve power density, then power delivery capability is improved, but thermal stress increases
Solution Approach 1:
The patent implements dynamic switching patterns that adapt to operating conditions. The controller selectively applies different switching strategies (first switching pattern vs second switching pattern) based on real-time requirements, allowing the system to optimize between power delivery and switching losses dynamically rather than using a fixed high-frequency approach
Solution Approach 2:
The patent employs periodic switching patterns that alternate between different frequency regimes. By cycling between the first switching pattern (higher frequency) and second switching pattern (lower frequency), the system creates periodic variations in thermal generation that prevent sustained high thermal stress while maintaining average power delivery capability
3Power
If conventional inverter configurations are used, then power conversion is achieved, but hardware complexity and cost increase due to more gate driver units and floating capacitors
Solution Approach 1:
The patent merges the functions of multiple gate driver units and floating capacitors into a simplified configuration. By using a single N-channel MOSFET Q3 instead of multiple isolated gate drivers and capacitors, the invention combines several protective and control functions into one integrated component, reducing hardware complexity while maintaining power conversion capability
Solution Approach 2:
The N-channel MOSFET Q3 serves multiple functions simultaneously: it acts as a body diode for reverse current flow, provides voltage clamping, replaces floating capacitors, and eliminates the need for isolated gate driver units. This multi-functional component design reduces the overall hardware requirements while maintaining all necessary power conversion functions
Data Source
AI summary
A controller for an inverter, the inverter comprising a plurality of switches, the controller configured to generate a control signal wherein the control signal operates the plurality of switches in a first switching pattern or a second switching pattern.