EV Brake Control Unit Using DC Link Voltage Hold During Battery Faults

The patent extracts the fault isolation function from the energy store modules themselves and relocates it to the converter unit. Instead of providing disconnecting devices at each energy store module, the converter unit is equipped with detection circuitry that monitors the operational status of energy store modules and automatically isolates faulty modules through the existing DC link connection, thereby eliminating the need for additional disconnecting devices while maintaining reliability

The converter unit is designed to perform multiple functions: it serves as the power conversion interface between energy store modules and the electric drive system, and simultaneously functions as the fault detection and isolation mechanism. This multi-functionality eliminates the need for separate disconnecting devices, reducing system complexity while maintaining the ability to isolate faults and maintain braking power

The patent removes the expensive disconnecting device hardware from each energy store module and replaces it with a cost-effective electronic fault detection and isolation system implemented within the converter unit. This extraction of the isolation function to the converter eliminates the need for multiple expensive all-pole disconnecting devices, significantly reducing manufacturing costs while maintaining the same reliability level

Instead of physically duplicating disconnecting devices at each energy store module, the patent uses a single fault detection and control system in the converter unit that can logically identify and isolate any faulty module. This virtual isolation mechanism copies the protective function without requiring physical hardware duplication, thereby reducing costs