EM1402EVM

EM1402 Evaluation Module

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1 EM1402 Evaluation Module

General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines

WARNING

Warning: To minimize risk of fire hazard, always verify and follow any specific safety instructions and application considerations related to the batteries being used in conjunction with this EVM.

Always follow TI’s set-up and application instructions, including use of all interface components within their recommended electrical rated voltage and power limits. Always use electrical safety precautions to help ensure your personal safety and the safety of those working around you. Contact TI’s Product Information Center http://support/ti./com for further information.

Save all warnings and instructions for future reference.

Failure to follow warnings and instructions may result in personal injury, property damage, or death due to electrical shock and/or burn hazards.

The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed printed-circuit-board assembly. It is intended strictly for use in development laboratory environments, solely for qualified professional users having training, expertise, and knowledge of electrical safety risks in development and application of high-voltage electrical circuits. Any other use or application are strictly prohibited by Texas Instruments. If you are not suitably qualified, you should immediately stop from further use of the HV EVM.

1. Work Area Safety:
   1. Keep work area clean and orderly.
   2. Qualified observer(s) must be present any time circuits are energized.
   3. Effective barriers and signage must be present in the area where the TI HV EVM and its interface electronics are energized, indicating operation of accessible high voltages may be present, for the purpose of protecting inadvertent access.
   4. All interface circuits, power supplies, evaluation modules, instruments, meters, scopes and other related apparatus used in a development environment exceeding 50 V_RMS or 75 VDC must be electrically located within a protected Emergency Power Off (EPO) protected power strip.
   5. Use a stable and non-conductive work surface.
   6. Use adequately insulated clamps and wires to attach measurement probes and instruments. No freehand testing whenever possible.
2. Electrical Safety:As a precautionary measure, it is always a good engineering practice to assume that the entire EVM may have fully accessible and active high voltages.
   1. De-energize the TI HV EVM and all its inputs, outputs, and electrical loads before performing any electrical or other diagnostic measurements. Revalidate that TI HV EVM power has been safely de-energized.
   2. With the EVM confirmed de-energized, proceed with required electrical circuit configurations, wiring, measurement equipment hook-ups and other application needs, while still assuming the EVM circuit and measuring instruments are electrically live.
   3. Once EVM readiness is complete, energize the EVM as intended.

WARNING: while the EVM is energized, never touch the EVM or its electrical circuits as they could be at high voltages capable of causing electrical shock hazard.

3. Personal Safety:
   1. Wear personal protective equipment, for example, latex gloves or safety glasses with side shields or protect EVM in an adequate lucent plastic box with interlocks from accidental touch.
4. Limitation for Safe Use:
   1. EVMs are not to be used as all or part of a production unit.

2 General Description

The Texas Instruments EM1402EVM Battery Management System (BMS) is an evaluation board of the Active Balance chipset for use in large format Lithium-ion batteries that provides monitoring, balancing, and communications. With precise and robust active balancing, the Active Balance BMS is capable of bi-directional power transfer at each cell. Each EM1402EVM can manage 6 to 16 cells (70-V max) for Li-ion battery applications. The EM1402EVM modules can be stacked up to 1300 V. The system provides fast cell balancing, diagnostics, and module to controller communication. Independent protection circuitry is also provided.

The EM1402EVM is equipped with precision measurement and synchronous communication to enable a master controller to perform State of Charge (SOC) and State of Health (SOH) estimation. Highly accurate cell voltages and a fast sampling time for the entire battery pack allows more efficient operation of battery modules and more accurate SOC and SOH calculations. The user will be able to extend the available capacity of the battery and will benefit from longer pack lifetimes versus passive or dissipative balancing systems.

The EM1402EVM is equipped with smart diagnostic systems. These systems monitor fault events such as undervoltage, overvoltage, and overtemperature. The system is also capable of pack temperature and cell temperature sensing. The fault flagging systems help protect the battery module and alert the user of potential problems.

2.1 Key Features

This EVM includes the following features:

• Active bi-directional cell balancing
• Multi-cell charge and discharge capability
• Isolated communications (5 kV)
• Flexible architecture for up to 16 cells
• UART interface
• High accuracy cell voltage measurement
• Diagnostics