Overview

The AL-3020 board can be used to emulate / simulate isolation faults between DC+ and PE and DC- and PE, and therefore verify that the battery management system works as expected, without the need to connect the BMS to a real battery pack.

Good insulation means infinite resistance between the DC channel and PE and to simulate faults it is possible to configure static resistance values but also decreasing resistance values, and when using the latter the software support doing it both asymmetrically (channels configured independently with no synchronization) and symmetrically (channels configured independently but changes of the resistor values should be synchronized).

The two resistor channels can be connected/disconnected to the BMS and configured independently.

Symmetric Faults – The isolation between the positive terminal and PE (chassis) and the negative terminal and PE (chassis) drops below the safe limit, and both the positive terminal and the negative terminal will have uniform (approximately) isolation resistance. It is harder for a BMS to detect a symmetric fault.

Asymmetric Faults - The isolation between one of the terminals (positive or negative) and PE (chassis) falls below the safe limit, and the terminals will exhibit different isolation resistances.

  • The AL-302010 is a two (2) channel accurate resistor isolation emulation board for applications that requires the possibility to emulate isolation faults.

  • The AL-3020 is designed for the National Instruments (NI) Switch Load Signal Conditioning (SLSC) system, to be used in Hardware-In-the-Loop (HIL) simulators.

  • The board interfaces NI PXI and/or Compact-RIO instrumentation devices for the purposes of developing, verifying, and validating electronic control unit software and hardware.

In addition to the capability to emulate isolation faults the board also includes the following fault insertion capability.

  • Hi-z / High-Impedance mode – possible to set the resistance >>20MΩ.

The diagram below illustrates a typical setup where the resistor isolation emulation board is connected to a BMS.

BMS and AL-3020

Typical Applications

  • Emulating / simulating isolation faults.

Features

  • Two (2) independent and isolated channels for resistor emulation.

  • Hi-z mode.

Functional Overview

Functional Overview