Battery System Switching Circuit for High-Voltage and Insulation Detection
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Solution Overview
Problem
Conventional high-voltage battery systems require separate circuits for high-voltage detection and insulation detection, leading to complex and large circuit designs.
Innovation Solution
A detection apparatus with a switching unit and processing unit that allows flexible switching between terminals and a reference ground, enabling high-voltage and insulation detection using a single set of circuits by connecting to vehicle body ground, and incorporating sampling branches for efficient voltage sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate circuits are used for high-voltage detection and insulation detection, then detection reliability is improved, but device complexity increases and circuit area expands
Solution Approach 1:
The patent combines high-voltage detection and insulation detection into a single integrated detection circuit. The detection circuit includes a detection unit that can detect both high-voltage signals and insulation resistance through shared signal paths and processing components, eliminating the need for completely separate detection circuits while maintaining detection reliability through careful circuit design with isolation mechanisms
Solution Approach 2:
The detection circuit is designed with multi-functional capability to perform both high-voltage detection and insulation detection using the same hardware resources. The detection unit can switch between different detection modes and the shared circuit components serve multiple purposes, reducing overall device complexity while maintaining comprehensive detection coverage
2Measurement precision
If separate circuits are used for high-voltage detection and insulation detection, then detection accuracy is maintained, but circuit area increases
Solution Approach 1:
The patent merges the detection functions into a compact integrated circuit that shares common signal paths, reference voltage sources, and processing units. This consolidation significantly reduces the total circuit area required compared to having completely separate detection circuits, while detection accuracy is preserved through proper signal isolation and dedicated detection channels within the integrated design
Solution Approach 2:
The integrated detection circuit employs multi-functional components that can serve both high-voltage detection and insulation detection purposes. By using shared ADCs, processors, and reference circuits that are configured for different measurement tasks, the patent reduces the overall circuit footprint while maintaining the precision required for both detection types through careful circuit architecture design
Data Source
AI summary
An apparatus for a battery system includes a switching unit and a processing unit. The switching unit includes a plurality of switching branches and a plurality of switching switches, where each of the plurality of switching branches includes a switching resistor, and the plurality of switching switches are configured to control the plurality of switching branches to be switched in or out between the following plurality of terminals and a reference ground: a positive electrode of a battery pack, a second terminal of a first contactor, a negative electrode of the battery pack, and a second terminal of a second contactor. The processing unit is configured to detect sampling point voltage information of the plurality of switching branches.