Battery Voltage Measurement Clock Synchronization for Timing Precision
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Solution Overview
Problem
Conventional voltage measurement systems in battery modules face precision issues due to misaligned oscillation frequencies of oscillators in voltage measurement devices, leading to imprecise determination of battery module states.
Innovation Solution
A voltage measurement system that includes a master oscillator and slave oscillators, with a correction circuit to synchronize the oscillation frequency of slave oscillators using a reference signal, enabling precise control of measurement timing through a normal and correction mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If voltage measurement devices use independent oscillators to determine measurement timing, then device operation is independent and simple, but measurement timing becomes misaligned due to frequency variations
Solution Approach 1:
The patent merges the timing reference function into a centralized master oscillator that provides clock signals to all voltage measurement devices. This ensures that all devices synchronize their measurements to the same time base, eliminating timing misalignment while maintaining operational simplicity through automated synchronization.
Solution Approach 2:
The control device monitors the measurement timing of each voltage measurement device and provides feedback to adjust their operation. This feedback mechanism ensures that all devices maintain synchronized measurement timing despite variations in their local oscillators, resolving the contradiction between independent operation and timing precision.
2Device complexity
If clock signals from local oscillators are used for measurement timing, then device complexity is reduced, but measurement precision deteriorates due to oscillator frequency misalignment
Solution Approach 1:
The patent introduces a master oscillator as an intermediary that generates the reference clock signal for all voltage measurement devices. This intermediary provides a unified time reference that all devices use for synchronization, maintaining simple local oscillator circuits while achieving precise simultaneous measurement through the mediating master clock signal.
3Device complexity
If measurement timing is determined by local oscillators, then system structure is simplified, but determination precision of battery module state deteriorates
Solution Approach 1:
The patent combines the timing reference function into a centralized master oscillator that provides synchronized clock signals to all voltage measurement devices. This merging approach maintains simple individual device structures while achieving precise battery module state determination through coordinated simultaneous measurements of all battery cells.
Data Source
AI summary
A voltage measurement system includes: a first reference signal transmission device (communication device) including a first master oscillator that generates a first master clock signal and a first reference signal generation circuit that generates a first reference signal based on the first master clock signal; and a first voltage measurement device including a first slave oscillator, a first correction circuit that corrects an oscillation frequency of the first slave oscillator based on the first reference signal, and a first voltage measurement circuit. The voltage measurement system includes: a normal mode; and a correction mode in which the first reference signal is transmitted from the first reference signal transmission device (communication device) to the first voltage measurement device, and the oscillation frequency of the first slave oscillator is synchronized with an oscillation frequency of the first master oscillator using the first reference signal.