Battery Control Device Bypass Circuit Bidirectional Diode Switch Diagnosis
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Solution Overview
Problem
The existing battery control device's bypass circuit cannot accurately diagnose the switch state when an external charger is connected, as it does not allow current flow in the discharging direction, leading to inaccurate voltage drop detection.
Innovation Solution
A battery control device with a bypass circuit that includes a diode unit composed of two diodes connected in parallel with opposite rectification directions, allowing bidirectional current flow and enabling accurate switch diagnosis by monitoring voltage and current differences across the switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple bypass circuit is used for switch diagnosis, then device complexity is reduced, but measurement precision deteriorates when external charger is connected
Solution Approach 1:
The bypass circuit is segmented into multiple functional sections: a first bypass switch for main bypass functionality, a second bypass switch for diagnostic operations, and a diode unit with specific polarity arrangement. This segmentation allows independent control of each component to achieve both simplicity and diagnostic precision under different operating conditions.
Solution Approach 2:
The diode unit acts as an intermediary element that enables bidirectional current flow control. By strategically placing diodes with opposite polarities, the circuit allows current to flow in appropriate directions during charging and discharging operations, enabling accurate voltage drop measurement across the bypass switches regardless of external charger connection status.
2Adaptability or versatility
If the bypass circuit allows bidirectional current flow, then adaptability improves during charging/discharging, but device complexity increases
Solution Approach 1:
The bypass circuit is designed with multi-functionality to handle both charging and discharging operations through a unified structure. The combination of first and second bypass switches with the diode unit creates a universal circuit that adapts its current flow path based on operational mode, eliminating the need for separate circuits for charging and discharging.
Solution Approach 2:
The circuit utilizes parameter changes in diode conductivity based on voltage polarity. During charging, the diode arrangement permits current flow in one direction, while during discharging, the same diode structure allows reverse current flow. This dynamic parameter change enables bidirectional adaptability without adding complex control mechanisms.
3Reliability
If voltage drop detection is performed during external charger connection, then diagnosis coverage is improved, but measurement precision deteriorates without bidirectional current flow
Solution Approach 1:
The bypass circuit incorporates dynamic switching capability through the second bypass switch, which can be activated or deactivated based on operational conditions. During external charger connection, the second switch is controlled to enable appropriate current paths, allowing voltage drop detection to proceed accurately regardless of the charging state, thus maintaining both diagnosis coverage and measurement precision.
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 improves the accuracy of switch diagnosis by enabling current flow in both directions, allowing for precise voltage drop detection even when an external charger is connected, thereby ensuring reliable switch operation assessment.
Implementation Method 1
a diode unit composed of two diodes connected in parallel with rectification directions of the diodes being opposite to each other
Data Source
AI summary
A battery control device that controls a connection between a battery and a load includes a first switch inserted between the battery and the load, a bypass circuit between the battery and the load, which is connected in parallel to the first switch and includes a second switch on the battery side, a diode unit composed of two diodes, and a third switch that are connected in series, an instruction unit that instructs the first, second, and third switches to open or close, an acquisition unit that acquires voltages of both ends of the second and third switches, respectively, and a diagnosis unit that diagnoses whether the first switch operates normally based on open or closed states of the switches and the voltages.