Internal Circuits

Power, CAN Block Diagram

The Helot modules contain transient voltage suppression and reverse polarity protection. An internal fuse is included between the +VSUPPLY bus and the module power circuitry to reduce the risk of a faulty module taking down the entire bus and other connected devices.

BMS100 - Power, CAN Block Diagram

Isolation Block Diagram

The modules are designed to provide 1kV of isolation between the Power, CAN Interface (J2/J3) and the Battery Cell Interface (J1). This isolation is implemented with two digital isolators spanning the GND and IGND references, between the MCU and Battery ASIC.

BMS100 - Isolation Block Diagram

Balancing Front-end Circuit Diagram

All cell tap interfaces are fused (Bel Fuse C2Q-250) to mitigate the risk of cell damage in the event of an internal module failure or short circuit. 47 Ohm, automotive grade pulse withstanding resistors are used for dissipative shunting of cell currents.

BMS100 - Balancing Front-end Circuit Diagram

NTC Input Circuit Diagram

The internal Battery ASIC provides a switched +2.5V reference bias, via a 10K pull-up for each of the two (2) external NTC temperature sensors.

Never injected voltage into the VTEMP pins, as it may damage the internal circuitry.

BMS100 - NTC Input Circuit Diagram