Battery Voltage Sensor Hysteresis and Delay Circuit
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Solution Overview
Problem
Existing battery voltage monitoring apparatuses face instability in detecting disconnection due to leak currents, which cause incorrect output signals and repeated switching between high and low levels, leading to unreliable disconnection detection.
Innovation Solution
Incorporating a voltage sensor with hysteresis characteristic and a delay circuit to stabilize the output signal, preventing false operations by ensuring the output remains consistent even with leak currents, and using a comparator operating with the battery cell's output potential as the source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a voltage sensor is used to detect battery cell voltage, then voltage monitoring is achieved, but leak currents cause incorrect output signals and false disconnection detection
Solution Approach 1:
A delay circuit is introduced as an intermediary between the voltage sensor and the output logic circuit. This delay circuit filters out transient leak current effects by delaying the voltage sensor output signal, preventing false disconnection detection while maintaining accurate voltage monitoring capability
Solution Approach 2:
The system performs preliminary voltage detection to identify potential disconnection conditions before they are misinterpreted as actual faults. By detecting voltage changes in advance and processing them through the delay circuit, the system prevents false alarm generation from leak currents
2Speed
If the voltage sensor output is directly connected to the output logic circuit, then the response is immediate, but the output switches repeatedly between high and low levels due to leak currents
Solution Approach 1:
The delay circuit serves as a mediator between the voltage sensor and output logic circuit, filtering out high-frequency noise and transient leak current effects while preserving the essential voltage change information, thus stabilizing the output signal without significantly compromising response speed
Solution Approach 2:
The delay circuit modifies the time parameter of the voltage sensor output signal by introducing a controlled delay period. This parameter change filters out transient fluctuations caused by leak currents while maintaining the detection of genuine voltage changes, achieving signal stabilization
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 prevents false operations and ensures stable detection of disconnections, maintaining accurate output signals and preventing the apparatus from switching between high and low levels, thus enhancing the reliability of battery voltage monitoring.
Implementation Method 1
the voltage sensor includes at least one comparator having hysteresis characteristic, and detects the potential of the battery cell based on an output of the comparator
Implementation Method 2
a delay circuit adding certain delay to the output of the voltage sensor and outputting the delayed voltage detect signal to the output logic circuit
Data Source
AI summary
A battery voltage monitoring apparatus monitoring a voltage of an assembled battery, the assembled battery including a plurality of battery cells, comprising; a first voltage sensor module that monitors voltages of a plurality of battery cells arranged at a high voltage side; and a second voltage sensor module that monitors voltages of a plurality of battery cells arranged at a low voltage side, wherein the second voltage sensor module comprises a voltage sensor that is connected to a terminal and detects a voltage of a battery cell connected to the terminal, the terminal being supplied with a power source potential of the second voltage sensor module, the voltage sensor comprises a comparator including a first terminal and a second terminal, the first terminal being supplied with a voltage according to the voltage of the battery cell, the second terminal being supplied with a reference voltage.