Voltage Measuring Device Multiplexer Segmentation Circuit Area
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Solution Overview
Problem
Conventional voltage measuring devices for battery cell arrays face challenges in managing increased circuit area due to the rising number of management-voltage-measuring power supplies, as all voltages are inputted to a single multiplexer, requiring high-breakdown voltage switches that increase the device's size.
Innovation Solution
The solution involves a voltage measuring device with multiple multiplexers, where high-voltage switches are used only for battery cell voltage measurement and ordinary switches for management-voltage-measuring power supplies, allowing for precise voltage measurement while minimizing circuit area expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all voltages (battery cells and management-voltage-measuring power supplies) are inputted to a single multiplexer, then the device structure is simple, but the circuit area increases due to high-breakdown voltage switches
Solution Approach 1:
The patent divides the single multiplexer into multiple multiplexers: a first multiplexer for battery cell voltage measurement and a second multiplexer for management-voltage-measuring power supplies. This segmentation allows each multiplexer to operate at appropriate voltage levels, with the second multiplexer using ordinary switches instead of high-breakdown voltage switches, thereby reducing the overall circuit area while maintaining functional simplicity.
2Adaptability or versatility
If high-breakdown voltage switches are used for all input terminals including management-voltage-measuring power supplies, then all voltages can be measured, but the circuit area increases
Solution Approach 1:
The patent applies different switch types to different multiplexers based on their specific functions: the first multiplexer uses high-breakdown voltage switches for battery cell voltage measurement, while the second multiplexer uses ordinary switches for management-voltage-measuring power supplies. This local differentiation optimizes the circuit area by using high-breakdown voltage switches only where necessary, while maintaining the ability to measure all required voltages.
3Area of stationary object
If multiple multiplexers with different switch types are used, then circuit area is reduced, but the device complexity increases
Solution Approach 1:
The patent implements a unified control mechanism where a single control unit manages the switching operations of multiple multiplexers. The control unit generates control signals that simultaneously control the first and second multiplexers, allowing them to operate cooperatively for measuring both battery cell voltages and management-voltage-measuring power supply voltages. This multi-functional control approach reduces the overall device complexity despite using multiple multiplexers with different switch types.
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 effectively suppresses the increase in circuit area even with an increased number of management-voltage-measuring power supplies, enabling precise voltage measurement by isolating high-voltage and low-voltage switches, preventing switch damage and measurement errors.
Implementation Method 1
a plurality of first capacitors provided for the respective output terminals of the plurality of multiplexers, the first capacitors having their one ends connected to the respective output terminals of the multiplexers, the first capacitors being charged in accordance with voltages outputted from the respective output terminals
Implementation Method 2
a differential amplifier including an inverting input terminal and a non-inverting input terminal, one input terminal of which is connected to the other ends of the first capacitors
Data Source
AI summary
A signal processor includes: a plurality of first capacitors provided for respective output terminals of a plurality of multiplexers, the first capacitors having their one ends connected to the respective output terminals of the multiplexers, the first capacitors being charged in accordance with voltages outputted from the respective output terminals; a differential amplifier including an input terminal connected to the other ends of the first capacitors; a second capacitor connected between the input terminal and an output terminal of the differential amplifier; and a second switch connected parallel to the second capacitor. First switches included in at least one of the plurality of multiplexers are configured as high-voltage switches that allow operation at a voltage higher than an operating voltage of first switches included in the other multiplexer or multiplexers.