Parallel Voltage Detection Lines with Drop Resistors for Open Circuit Fault Identification

The patent combines multiple voltage detection lines into a single detection point by connecting them in parallel between the battery voltage detection node and the voltage detection circuit input. This merging approach maintains the reliability benefits of multiple detection lines while simplifying the circuit structure to a single measurement point, resolving the contradiction between reliability and complexity.

The voltage detection circuit is designed to serve multiple functions: it detects battery voltage through parallel voltage detection lines and simultaneously detects open circuit conditions in these lines. By making the detection circuit universal, the patent eliminates the need for separate detection mechanisms, thereby reducing overall circuit complexity while maintaining high reliability.

The patent implements a feedback mechanism where the voltage detection circuit continuously monitors the voltage at the detection node and compares it against expected values. When an open circuit occurs in a voltage detection line, the feedback mechanism detects the abnormal voltage reading and triggers an open circuit alarm, making open circuit detection as easy as voltage detection.

The patent introduces a decision circuit as an intermediary between the voltage detection circuit and the control system. This decision circuit analyzes the voltage detection results and determines whether an open circuit condition exists, thereby simplifying the overall detection process and making open circuit detection as straightforward as voltage measurement.