Battery Voltage Measurement Circuit for Capacitor Failure Detection
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Solution Overview
Problem
Existing insulation resistance detection apparatuses face reduced detection accuracy due to unstable voltage applied to detection resistances when capacitors fail, affecting the reliability of insulation resistance measurement.
Innovation Solution
A battery voltage measurement circuit with a failure detection mode that includes capacitors connected in parallel to detection resistances, allowing for multiple measurement modes and a controller to detect capacitor failures based on voltage changes during mode switching, thereby stabilizing voltage and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If capacitors are connected in parallel to detection resistances to stabilize voltage, then voltage stability is improved, but detection accuracy deteriorates when capacitors fail
Solution Approach 1:
The system performs preliminary detection of capacitor status by measuring voltage at specific timing after switching operations. This allows the system to identify capacitor failures before they affect insulation resistance measurement accuracy, enabling preventive action or compensation
Solution Approach 2:
The measurement circuit continuously monitors voltage across detection resistances and feeds back capacitor status information. This feedback mechanism allows the system to adjust measurement timing or compensate for capacitor failures to maintain detection accuracy
2Reliability
If multiple measurement modes are implemented for capacitor failure detection, then detection capability is improved, but device complexity increases
Solution Approach 1:
The measurement circuit is designed to perform multiple functions using the same hardware components. The circuit can measure both capacitor voltage and insulation resistance using the same switches and detection resistances, eliminating the need for separate dedicated detection circuits
Solution Approach 2:
The system implements periodic measurement cycles that alternate between capacitor detection mode and insulation resistance measurement mode. By switching between modes at predetermined intervals, the system achieves comprehensive monitoring without requiring simultaneous complex circuitry
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 enhances the detection accuracy of insulation resistance by stabilizing voltage and accurately identifying capacitor failures, preventing erroneous readings and ensuring reliable insulation resistance monitoring.
Implementation Method 1
capacitors that are connected in parallel to the detection resistances
Implementation Method 2
detection resistances that are connected in series between the first switch and the second switch
Data Source
AI summary
A battery voltage measurement circuit includes: a first switch configured to be connected to a positive electrode of a battery; a second switch configured to be connected to a negative electrode of the battery; detection resistances that are connected in series between the first switch and the second switch; capacitors that are connected in parallel to the detection resistances; and a measurement circuit that measures a voltage applied to the detection resistances. The battery voltage measurement circuit has a plurality of measurement modes depending upon status of the first and second switches, and further has a failure detection mode for the capacitors based on a change in the voltage after switching from one to an other of the measurement modes.