Power Conversion Apparatus Dual Capacitor Voltage Mode
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Solution Overview
Problem
The existing motor drive apparatuses require different configurations for low and high AC supply voltages, leading to increased component numbers and complex production management, as they need separate inverters and capacitor configurations, which increases production costs and complexity.
Innovation Solution
A power conversion apparatus with an inverter unit and two capacitor groups connected via terminal portions, allowing for switching between parallel and series configurations using common change-over components, enabling the apparatus to support both low and high AC supply voltages with reduced component types and simplified production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate inverters and capacitor configurations are used for low and high AC supply voltages, then the motor drive apparatus can be optimized for each voltage type, but the number of components increases and production management becomes complex
Solution Approach 1:
The patent applies universality by designing a single inverter unit that can handle both low and high AC supply voltages through configurable capacitor group connections. The inverter is equipped with terminal portions and change-over components that allow it to adapt to different voltage conditions, eliminating the need for separate inverter designs for different voltage types while maintaining optimization for each condition.
Solution Approach 2:
The patent implements dynamics by introducing change-over components (switches) that can dynamically reconfigure the connection relationships between capacitor groups based on the AC supply voltage type. This allows the system to transition between different operational states (series/parallel configurations) as needed, providing adaptability without requiring multiple fixed configurations.
2Reliability
If different configurations are used for low and high AC supply voltages, then each configuration can be optimized, but production costs increase due to multiple component types
Solution Approach 1:
The patent reduces production costs by employing a universal inverter design that serves both low and high voltage applications. Instead of manufacturing separate inverters for each voltage type, the same inverter unit is produced with the capability to be configured for different voltages through the capacitor group connection system, thereby reducing component variety and manufacturing complexity.
Solution Approach 2:
The patent merges the functionality of multiple inverters into a single unified inverter unit. By combining the ability to handle both low and high voltages within one inverter design, the system reduces the total number of components that need to be manufactured, stocked, and assembled, leading to lower production costs despite maintaining configuration optimization.
3Adaptability or versatility
If multiple capacitor groups with different connection relationships are used, then the apparatus can support both voltage types, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the capacitor system into multiple independent capacitor groups (first and second capacitor groups), each with its own terminal portions. This segmentation allows flexible connection configurations where capacitor groups can be connected in series or parallel based on voltage requirements, while keeping each individual capacitor group relatively simple in structure.
Solution Approach 2:
The patent uses change-over components (switches) as intermediaries to manage the connection relationships between capacitor groups. These switches act as mediators that can selectively connect or disconnect capacitor groups in different configurations, simplifying the control of complexity by providing a standardized interface for reconfiguration rather than requiring direct complex wiring changes.
Data Source
AI summary
A power conversion apparatus includes: an inverter unit; a first capacitor group, an positive electrode of the first capacitor group connected to an positive electrode on the DC input side of the inverter unit; a second capacitor group, a negative electrode of the second capacitor group connected to a negative electrode of the DC input side of the inverter unit; a first terminal portion connected to the positive electrode of the first capacitor group; a second terminal portion connected to a negative electrode of the first capacitor group; a third terminal portion connected to an positive electrode of the second capacitor group; and a fourth terminal portion connected to the negative electrode of the second capacitor group, wherein a distance between the first terminal portion and the third terminal portion is approximately equal to a distance between the second terminal portion and the fourth terminal portion.