Voltage Measuring Device RC Filter Segmentation
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Solution Overview
Problem
Existing voltage measuring devices for battery assemblies with series-connected modules have limited design freedom for RC filters and require high withstand voltage limits for capacitors due to unequal filter frequency characteristics across measurement channels.
Innovation Solution
A voltage measuring device with RC filters comprising equal resistance values for resistors and equal capacitance values for capacitors, where dividing capacitors are connected in series through measurement nodes, allowing for independent placement as non-dividing or dividing capacitors, and satisfying specific inequalities for uniform frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If all capacitors are connected in series to form RC filters for voltage measurement, then the filter frequency characteristics can be uniform across measurement channels, but the layout freedom is limited and the withstand voltage requirements for capacitors increase
Solution Approach 1:
The patent divides the capacitor group into multiple sub-groups, where each sub-group is connected in series within a measurement channel. This segmentation allows each capacitor sub-group to be independently laid out, increasing layout freedom while maintaining uniform filter characteristics across all measurement channels through consistent design of each sub-group.
2Manufacturing precision
If all capacitors are connected in series to form RC filters, then the filter frequency characteristics can be uniform, but the withstand voltage limits for capacitors must be high
Solution Approach 1:
By dividing the capacitor group into multiple sub-groups connected in series within each measurement channel, the total voltage across all capacitors is distributed across the sub-groups. Each capacitor in a sub-group only needs to withstand a fraction of the total voltage, thereby reducing the individual capacitor withstand voltage requirements while maintaining uniform filter frequency characteristics.
3Ease of manufacture
If resistors and capacitors are used with identical values in RC filters, then general-purpose components can be used for cost-effectiveness, but the filter frequency characteristics differ across measurement channels
Solution Approach 1:
The patent applies local quality by configuring capacitor sub-groups with specific series connections in each measurement channel. While general-purpose resistors and capacitors with identical base values are used throughout, the local arrangement of capacitor sub-groups is optimized for each channel to achieve uniform filter frequency characteristics, thus maintaining cost-effectiveness while improving precision.
4Adaptability or versatility
If capacitors are independently placed without series connection, then layout freedom increases, but the filter frequency characteristics become non-uniform across channels
Solution Approach 1:
The patent segments capacitors into sub-groups that are connected in series within each measurement channel. This segmentation provides layout freedom because each sub-group can be independently positioned, while simultaneously ensuring uniform filter frequency characteristics through the consistent series-connection configuration of each sub-group across all channels.
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 configuration increases design freedom for RC filters while reducing the withstand voltage limits for capacitors, ensuring uniform filter frequency characteristics and cost-effectiveness by using general-purpose components.
Implementation Method 1
a plurality of voltage detector sections connected between adjacent ones of the measurement nodes in terms of potential magnitudes, a plurality of resistors having respective ends connected to the non-reference nodes and respective other ends connected to junctions between the battery modules or to opposite ends of the battery assembly, at least one dividing capacitor group having a plurality of dividing capacitors connected in series through the measurement nodes
Data Source
AI summary
Provided is a voltage measuring device capable of increasing the degree of freedom in the design of an RC filter (low-pass filter) while suppressing the withstand voltage limit of a capacitor. The voltage measuring device comprises: at least one divided capacitor group having a plurality of divided capacitors connected in series through measurement nodes and having one end connected to a reference node and the other end connected to a non-reference node; and at least one non-divided capacitor having one end connected to the reference node and the other end connected to a non-reference node to which the divided capacitors are not connected.