Voltage Path and Current Path

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Updated2025-10-31
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Voltage Path and Current Path

The voltage, current, and power of setpoints flow into the paths of voltage, current, and power. The output of these paths is the setpoints that are transferred to the DC cycler.

Voltage Path

Voltage setpoints are restricted by the DUT limits that you set.

Note For battery pack applications, voltage setpoints are also restricted by the battery management system.

Current and Power Path (Simple Setpoint)

Inputs into the current path include the following:

Test mode
Nominal current
Nominal power
Actual voltage

In addition to these variables, there are current limiters and power limiters.

Switch Setpoint

The setpoint is switched depending on the test mode. In the test mode Current, the current setpoint is applied. In the test mode Power, the calculated current setpoint is applied.

While in automatic mode, you can enable Power test mode from the Operationmode selection list. In manual mode, you can switch between the Current and Power test modes using a toggle.

Calculated I = P / U

In Power Test mode, the current setpoint is calculated from the power setpoint and the actual voltage of the cell.

High frequency current and power setpoints are sent to cyclers, such as the NHR-9300 and ERS-BIC, by passing the following commands to the cycler module.

Note Battery pack commands include the variable CN<number>. This variable represents the connector (CN) number. For example, BattPack_CN2_Testmode enables test mode on connector two.

Table 28. Cycler Module Commands
Command	Description	Examples
Testmode	Defines how the application operates in a specific control mode according to the following values: 1: Current controlled 2: Power controlled	BattCell_Cycler_TestMode BattModule_Cycler_TestMode BattPack_CN<number>_TestMode
Current_limited.SP	Represents the current setpoint for the cycler.	BattCell_Current_limited.SP BattModule_Current_limited.SP BattPack_CN<number>_Current_limited.SP
Power_limited.SP	Represents the power setpoint for the cycler.	BattCell_Power_limited.SP BattModule_Power_limited.SP BattPack_CN<number>_Power_limited.SP

Limiters

Limiters for the current include the following:

DUT limits that you parameterize.
Calculated limits from the table DUT_Current_Max_Limiter_SOC_Temperature.WTB and DUT_Current_Min_Limiter_SOC_Temperature.WTB in which you parameterize the current depending on SOC and temperature.