Voltage Sensing Circuit with Polarity Switching for Battery Packs
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Solution Overview
Problem
Existing voltage sensing devices for series-connected secondary batteries require a unique correction constant for accurate voltage sensing, leading to time-consuming pre-shipment inspections and potential errors due to temporal changes, and they often necessitate complex circuitry and high power consumption.
Innovation Solution
A voltage sensing device with multiple voltage input nodes, a switch part to select and connect pairs of nodes in different polarity patterns, and a signal generating part that amplifies and processes signals to cancel out error components, allowing for precise voltage sensing without a unique correction constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a unique correction constant is acquired for each device through pre-shipment inspection, then measurement precision is improved, but loss of time increases and device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for device-specific correction constants by using a common correction table stored in ROM. The voltage sensing circuit measures raw voltage values and directly references the common correction table to obtain accurate voltage values, removing the time-consuming step of acquiring unique correction constants for each device during pre-shipment inspection.
Solution Approach 2:
The patent implements a universal correction table that can be used across multiple devices and battery configurations. The common correction table stores correction data that applies to all voltage sensing operations, eliminating the need for device-specific calibration and enabling the same circuitry to accurately sense voltages in various battery pack configurations without reconfiguration.
2Measurement precision
If a unique correction constant is acquired for each device, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the correction data from individual device calibration procedures and consolidates it into a common correction table stored in ROM. This eliminates the need for complex per-device calibration circuits and procedures, replacing them with a simple lookup operation that references the pre-stored common correction table.
Solution Approach 2:
The patent uses a read-only memory (ROM) to store the common correction table, creating a permanent copy of the correction data that can be repeatedly accessed without modification. This allows the system to use the same correction data across multiple devices and operations, eliminating the need for complex real-time calculation or per-device storage of correction constants.
3Measurement precision
If complex processing is performed to acquire accurate voltage values for all cell modules, then measurement precision is improved, but loss of time increases and use of energy increases
Solution Approach 1:
The patent performs correction data preparation in advance by storing the common correction table in ROM during manufacturing. The correction values are pre-calculated and stored, so that during operation, the system only needs to perform simple lookup and comparison operations rather than complex real-time calculations, significantly reducing the time required to ascertain voltage values.
Solution Approach 2:
The patent stores the correction table in ROM, creating a permanent copy of the correction data that can be rapidly accessed multiple times without recalculation. This allows the system to efficiently retrieve correction values for each voltage measurement without repeating complex computational processes, reducing both time and energy consumption.
4Measurement precision
If a microcomputer is used to perform correction calculations, then measurement precision is improved, but use of energy increases and device complexity increases
Solution Approach 1:
The patent replaces the microcomputer-based correction calculation system with a simpler voltage sensing circuit that directly references the common correction table stored in ROM. This substitution eliminates the need for continuous microcomputer operation, analog-to-digital conversion, and complex software processing, significantly reducing power consumption while maintaining measurement accuracy through direct voltage comparison with the correction table.
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
Enables high-precision voltage sensing, reduces inspection time, eliminates errors from temporal changes, and simplifies circuitry, resulting in improved reliability and reduced power consumption.
Implementation Method 1
an operational amplifier circuit that amplifies a voltage input to a pair of sense input nodes and generates a sensed voltage signal according to an amplification result
Data Source
AI summary
A voltage sensing device with which high-precision voltage sensing is possible without acquiring a unique correction constant for each device. A pair of voltage input nodes NCk and NCk-1 are selected from n+1 voltage input nodes NC0-NCn in switch part 10, and the selected voltage input nodes NCk and NCk-1 are connected to inspection input nodes NA and NB. Here, voltage input nodes NCk and NCk-1 and inspection input nodes NA and NB are connected in two types of patterns of different polarity (forward connection, reverse connection) under the control of control part 50, and digital data S30 for the two sensed voltage signals S20 generated in the two types of connection patterns is input to sensed data processing part 40. With sensed data processing part 40, sensed voltage data S40 that represents the potential difference between voltage input nodes NCk and NCk-1 is generated according to the difference in the two sensed voltage signals S20.