Differential Voltage Measurement Device Using Segmented Capacitors
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Solution Overview
Problem
Existing battery state detection devices face challenges in accurately measuring differential voltage due to voltage drops caused by leakage currents in capacitors, leading to reduced measurement accuracy.
Innovation Solution
A differential voltage measurement device is designed with a large first capacitor and a smaller second capacitor, along with a control unit that manages the switching of voltages between them, including a leakage current prevention switch and a protection switch, to minimize voltage drops and improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a capacitor is used to hold voltage for sequential measurement, then voltage can be stored and compared, but leakage current causes voltage drop and reduces measurement accuracy
Solution Approach 1:
The patent divides the measurement system into two separate capacitors (first capacitor C1 and second capacitor C2) instead of using a single capacitor. Each capacitor independently holds voltage from different measurement timings, allowing sequential voltage storage without interference. This segmentation prevents the voltage drop problem because each capacitor operates independently with its own charge accumulation period.
Solution Approach 2:
The patent performs preliminary voltage accumulation in capacitors before the actual differential measurement. The first capacitor C1 accumulates voltage during a first period, and the second capacitor C2 accumulates voltage during a second period, both before the final comparison. This preliminary action allows the system to prepare stable reference voltages in advance, reducing the impact of leakage during the critical measurement phase.
2Measurement precision
If the second capacitor accumulates charge for a long period to ensure stability, then measurement accuracy improves, but voltage drop from leakage current increases
Solution Approach 1:
By using two separate capacitors instead of one, the patent allows each capacitor to have its own optimized charge accumulation period. The first capacitor C1 can be charged during a first time period while the second capacitor C2 is charged during a second time period, enabling parallel or sequential operation that reduces total measurement time while maintaining stability.
Solution Approach 2:
The patent employs periodic charging cycles where each capacitor is charged for specific time periods and then used for measurement. The control unit manages periodic switching between charging and measuring phases, allowing the system to achieve stable measurements through repeated cycles rather than requiring a single long accumulation period.
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
The solution effectively reduces voltage drops during charge accumulation in the second capacitor, enhancing the accuracy of differential voltage measurements between sequentially acquired voltages.
Implementation Method 1
a first capacitor C1 and a second capacitor C2, a differential amplification unit 240 that outputs a voltage obtained by amplifying a differential voltage between a voltage held in the first capacitor C1 and a voltage held in the second capacitor C2
Implementation Method 2
a differential amplification unit 240 that outputs a voltage obtained by amplifying a differential voltage between a voltage held in the first capacitor C1 and a voltage held in the second capacitor C2
Data Source
AI summary
A differential voltage measurement device includes a first capacitor, a second capacitor of which the capacity is smaller than that of the first capacitor, a differential amplification unit which outputs a voltage according to a differential voltage between a voltage held in the first capacitor and a voltage held in the second capacitor, and a control unit which guides a first voltage to the first capacitor and guides a second voltage to the second capacitor in a state where the first capacitor holds the first voltage.