Voltage Detecting Circuit Capacitance Variation Compensation
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Solution Overview
Problem
Existing voltage detecting technologies for batteries are affected by the device characteristics of flying capacitors, leading to decreased detection accuracy of application voltage due to capacitance variations.
Innovation Solution
A voltage detecting circuit that calculates the application voltage based on the actual capacitance value of the capacitor, including its variation, to remove the effects of capacitance variation and enhance detection accuracy, independent of the capacitor's device characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a preset discharging time is used to remove voltage change due to capacitor variation, then the measurement process is simplified, but detection accuracy decreases due to residual capacitance variation effects
Solution Approach 1:
The patent implements feedback by measuring the actual capacitance value of the flying capacitor and using this information to correct the discharging voltage calculation. The control unit adjusts the measurement based on the detected capacitance variation, creating a closed-loop system that compensates for component tolerances and improves measurement accuracy without complicating the overall process
Solution Approach 2:
The patent changes the parameter used for voltage calculation from a fixed time-based assumption to a dynamic parameter that incorporates actual capacitance measurements. By using the detected capacitance value to adjust the discharging voltage calculation, the system adapts to actual component characteristics rather than relying on nominal values, thereby improving accuracy
2Device complexity
If fixed discharging time is applied regardless of capacitor variation, then device complexity is reduced, but detection accuracy is compromised by capacitance variation
Solution Approach 1:
The measurement system performs self-characterization by automatically detecting the actual capacitance value of the flying capacitor during operation. This self-service approach allows the system to compensate for component variations without requiring external calibration equipment or complex pre-characterization procedures, maintaining simplicity while improving accuracy
Solution Approach 2:
The patent performs preliminary measurement of the flying capacitor's capacitance value before using it for voltage detection. By characterizing the capacitor's actual parameters in advance, the system prepares correction factors that are then applied during voltage measurement, eliminating the need for complex real-time adjustments while maintaining high accuracy
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 increases the detection accuracy of the application voltage by accounting for capacitance variations, making the voltage detecting circuit independent of the capacitor's device characteristics and providing precise voltage measurements.
Implementation Method 1
a capacitor C1 to which a voltage from the DC power supply is applied
Data Source
AI summary
A voltage detecting circuit includes a ground potential unit, a DC power supply which is insulated from the ground potential unit, a capacitor to which voltage from the DC power supply is applied, a control unit which controls charging and discharging of the capacitor, a charging circuit that includes the DC power supply, the capacitor and a charging path through which the capacitor is charged, and a discharging circuit that includes the capacitor and a discharging path through which the capacitor is discharged. The control unit includes a calculation unit which calculates a voltage value of the DC power supply, based on an actual capacitance value C of the capacitor which is obtained by both-end voltage of the capacitor corresponding to a first time and the both-end voltage of the capacitor corresponding to a second time.