High-Voltage Flyback Converter Circuit for Motor Drive
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Solution Overview
Problem
Existing circuit arrangements for driving electrical machines require significant structural space and resources to overcome the isolation barrier between low-voltage and high-voltage systems, limiting efficiency and cost-effectiveness.
Innovation Solution
Designing high-side and low-side flyback converters as high-voltage converters, connected to the high-voltage system, eliminates the need for galvanic isolation, reducing structural space requirements and enabling a redundant voltage supply for gate drivers and logic units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flyback converters are used to overcome the isolation barrier between low-voltage and high-voltage systems, then functional isolation is achieved, but structural space requirements increase
Solution Approach 1:
The patent merges the high-voltage flyback converter and low-voltage flyback converter into a single integrated circuit arrangement, where both converters share common structural elements and housing. This integration maintains the functional isolation between high-voltage and low-voltage systems while significantly reducing the total structural space required compared to separate converter designs.
Solution Approach 2:
The patent implements a nested configuration where the low-voltage flyback converter is positioned adjacent to and integrated with the high-voltage flyback converter. The converters share common magnetic components and structural support elements, creating a compact nested arrangement that minimizes overall footprint while preserving galvanic isolation barriers.
2Reliability
If separate emergency supply for logic unit is provided, then reliability upon failure is improved, but device complexity increases
Solution Approach 1:
The patent combines the emergency supply function with the existing high-voltage flyback converter by tapping into its auxiliary winding. Instead of providing a completely separate emergency supply system, the design merges the backup power function into the primary converter structure, reducing device complexity while ensuring continuous operation of the logic unit even upon failure of the low-voltage converter.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach minimizes structural space and costs while ensuring reliable operation by eliminating the need for galvanic isolation and providing a redundant power supply, enhancing the overall efficiency and cost-effectiveness of the circuit arrangement.
Implementation Method 1
flyback converters, also called boost or buck converters
Data Source
AI summary
The invention relates to a circuit arrangement (1), in particular for controlling an electric machine, comprising at least one high-voltage semiconductor bridge circuit (2) that includes a low-side semiconductor switch (4) and a high-side semiconductor switch (3). A high-side gate driver (5) is assigned to the high-side semiconductor switch (3), and a low-side gate driver (6) is assigned to the low-side semiconductor switch (4). According to the invention, a high-side flyback converter (8) is connected upstream of the high-side gate driver, and a low-side flyback converter (9) is connected upstream of the low-side gate driver (6), at least one of the flyback converters (7, 8, 9) being designed as a high-voltage flyback converter.