Voltage Detector Insulator Interface Common Communication Line
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Solution Overview
Problem
Conventional voltage detectors for in-vehicle high voltage batteries require multiple communication lines and a large number of components, leading to increased manufacturing costs and complexity due to the need for separate bus lines and insulator interfaces for each block of unit cells, which complicates the detection of output voltages and reduces the available capacity of the battery.
Innovation Solution
A voltage detector design featuring a common communication line with a main line and branch lines for both detection instructions and results, utilizing insulator interfaces such as photo-couplers or magnetic couplers to transmit signals electrically insulated from the high voltage battery, allowing each voltage detector unit to recognize its self-address and operate independently, reducing the number of required components and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate bus lines and insulator interfaces are used for each block of unit cells, then the output voltage of each block can be detected independently, but the number of components increases and manufacturing cost increases
Solution Approach 1:
The patent merges multiple separate communication lines into a single shared communication line that carries both detection instructions from the control device and detected result signals from multiple voltage detector units. This consolidation reduces the number of required bus lines and insulator interfaces while maintaining the ability to independently detect output voltages of each block through address-based identification.
Solution Approach 2:
The single communication line serves multiple functions: it transmits detection instructions from the control device to voltage detector units, carries detected result signals back to the control device, and supports multiple blocks simultaneously through address coding. This multi-functional approach eliminates the need for dedicated separate lines for each block.
2Reliability
If multiple insulator interfaces are used for each block, then electrical insulation is maintained, but the manufacturing cost and device complexity increase
Solution Approach 1:
The patent combines multiple insulator interfaces into a single insulator interface that handles all communication between the high voltage side (voltage detector units) and the low voltage side (control device). This single insulator interface maintains electrical insulation while reducing component count and manufacturing complexity.
Solution Approach 2:
The insulator interface acts as an intermediary device that enables safe communication across the high voltage boundary. By using a single well-designed insulator interface with address-based identification, the system maintains reliable electrical insulation without requiring multiple separate isolation components for each block.
3Loss of information
If separate communication lines are used for each voltage detector unit, then detection instructions can be transmitted accurately, but the configuration becomes complex and costly
Solution Approach 1:
The single communication line is designed to universally serve all voltage detector units by incorporating address-based identification. The control device can selectively address specific units, and units can selectively respond, maintaining accurate instruction transmission without requiring dedicated separate lines for each unit.
Solution Approach 2:
While using a single physical communication line, the system logically segments communication by assigning unique addresses to each voltage detector unit. This allows the control device to transmit targeted detection instructions to specific units and receive their individual results, maintaining the precision of separate communication while using a unified physical medium.
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 design simplifies the configuration, reduces manufacturing costs, and allows for efficient detection of output voltages across multiple unit cells, enhancing the dynamic performance and fuel efficiency of Hybrid Electric Vehicles by uniformly balancing the state of charge across the battery cells.
Implementation Method 1
insulator interfaces IF11-IF1m, such as photo-couplers
Implementation Method 2
utilizing insulator interfaces such as photo-couplers or magnetic couplers to transmit signals electrically insulated
Data Source
AI summary
The present invention is to provide a voltage detector having a common communication line for reducing a manufacturing cost. A low voltage line CPU transmits a detection instruction including an assignment of one address among a plurality of blocks. The detection instruction is branched by a transmitting bus line for concurrently transmitting to a plurality of voltage detector units. When one of the voltage detector units receives the detection instruction with the address being same as a self-address thereof, the voltage detector unit detects output voltages of unit cells and transmits the detected result to the low voltage line CPU. When the received address is not the self-address, the voltage detector unit does not transmit the detected result.