Converter Control With Split Switch Frequencies to Cut Losses
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Solution Overview
Problem
Conventional converter devices experience high electrical switching losses due to synchronous switching of power semiconductor switches, which is not efficiently addressed by existing technologies.
Innovation Solution
The converter device employs a control strategy where the first, fifth, sixth, and fourth power semiconductor switches are switched on and off at a higher frequency than the second and third switches, with specific diode configurations and semiconductor materials used to minimize switching losses, and incorporates snubber capacitors to reduce high-frequency oscillations and overvoltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher switching frequency is applied to reduce switching losses, then switching efficiency improves, but electrical switching losses and high-frequency oscillations increase
Solution Approach 1:
The patent applies local quality by differentiating switching frequencies for different switches based on their specific roles in the converter circuit. Switches 1, 4, 5, and 6 operate at higher frequencies optimized for their functions, while switches 2 and 3 operate at lower frequencies to minimize electrical switching losses and oscillations. This localized optimization resolves the contradiction by allowing high switching efficiency where needed while controlling losses in critical areas.
Solution Approach 2:
The patent implements dynamic switching frequency control where the switching frequency is not uniform across all switches but is dynamically optimized for each switch based on circuit requirements. This dynamic approach allows the system to achieve high switching efficiency for power conversion while simultaneously controlling electrical switching losses and suppressing high-frequency oscillations through differentiated frequency assignment.
2Device complexity
If conventional switching strategy is used, then device complexity is low, but electrical switching losses are high
Solution Approach 1:
The patent introduces dynamic switching frequency control as a moderate increase in device complexity. The control device is configured to differentiate switching frequencies for different power semiconductor switches, which requires enhanced control logic but remains implementable with standard power electronics control techniques. This controlled increase in complexity achieves significant reduction in electrical switching losses, representing an acceptable trade-off that resolves the contradiction.
Solution Approach 2:
The patent changes the switching frequency parameter for different switches to optimize performance. By configuring the control device to apply different frequency parameters to different switches (higher frequency for switches 1, 4, 5, 6 and lower frequency for switches 2, 3), the system reduces electrical switching losses while maintaining manageable device complexity through systematic parameter differentiation.
Data Source
AI summary
A converter device has a converter that has power semiconductor switches and has a control device that is designed to drive the power semiconductor switches. The control device is designed to drive the power semiconductor switches so that electrical switching losses occurring in the converter are reduced during use.