Battery Voltage Sensing Circuit for Fast Connection Failure Detection
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Solution Overview
Problem
Existing battery management systems require a prolonged short-circuit time to detect connection failures due to noise filters, leading to increased power loss.
Innovation Solution
A storage battery monitoring device with measurement and adjustment lines connected in parallel to voltage detection lines, featuring capacitive elements and switches that allow for reduced short-circuit time by controlling voltage changes after a predetermined time, enabling faster detection of connection failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a short circuit is caused via a resistor between the voltage detection lines to detect connection failure, then connection failure can be detected, but the discharge time required in accordance with the time constant of the noise filter prolongs the short-circuit time and increases power loss
Solution Approach 1:
The patent divides the capacitive element into two separate capacitive elements: a first capacitive element connected between the voltage detection lines, and a second capacitive element connected between the adjustment lines. This segmentation allows the second capacitive element to be discharged quickly through the switch without affecting the noise filtering function of the first capacitive element, thereby reducing the short-circuit time and power loss while maintaining connection failure detection capability
Solution Approach 2:
The patent introduces adjustment lines as an intermediary between the voltage detection lines and the switch. The adjustment lines are connected through a capacitive element to the voltage detection lines, allowing the switch to discharge the second capacitive element quickly for fast connection failure detection, while the first capacitive element on the voltage detection lines continues to provide noise filtering. This intermediary structure resolves the conflict between fast detection and noise filtering
2Reliability
If a short circuit is caused via a resistor between the voltage detection lines to detect connection failure, then connection failure can be detected, but the prolonged short-circuit time increases the detection time
Solution Approach 1:
The patent segments the capacitive elements into two separate components with distinct functions: the first capacitive element maintains the noise filtering function, while the second capacitive element is optimized for fast discharge through the switch. This segmentation enables the short-circuit time to be reduced to the discharge time of the second capacitive element only, significantly reducing the detection time while maintaining connection failure detection reliability
Solution Approach 2:
The patent pre-charges the second capacitive element through the adjustment lines before the connection failure detection process begins. When a connection failure is detected, the switch can immediately discharge the pre-charged second capacitive element without waiting for charging, thereby reducing the short-circuit time and enabling faster detection
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
This configuration reduces the short-circuit time required to detect connection failures and minimizes power loss, allowing for more efficient battery management.
Implementation Method 1
a first capacitive element connected between the pair of measurement lines
Implementation Method 2
a second capacitive element connected between the pair of adjustment lines
Data Source
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AI summary
A storage battery monitoring device includes a pair of measurement lines connected respectively to a pair of voltage detection lines connected respectively to a positive and a negative electrode of a rechargeable battery, a pair of adjustment lines connected respectively to the pair of voltage detection lines in parallel with the measurement lines, a first capacitive element connected between the pair of measurement lines, a second capacitive element connected between the pair of adjustment lines, and a switch connected across the second capacitive element. Capacitance values of the first and second capacitive elements are set such that a voltage between the pair of measurement lines continues changing after closing the switch and then opening the switch after a lapse of a predetermined short-circuit time if the voltage detection line is broken.