s32k358 mc3374a BMS Unable to Balance

[avenkat]

Hi NXP Community  ,
I am facing an issue implementing Balancing in RD-HVBMSCT800BUN

The function I have written to perform it is as follows:

/**
* @brief Perform Global Balancing
*
* @param[in] GlobalBalConfig Set required config
* @param[in] module_bal_list Enabling Balancing for a module
* @param[in] cell_masks set masks for required channel
* @return
*/
HVBMS_Errors global_bal(Bcc_774a_BalConfigurationType *GlobalBalConfig, boolean module_bal_list[BCC_DEVICE_CNT], uint16 cell_masks_bal[BCC_DEVICE_CNT])
{
Std_ReturnType Status = E_OK;
uint8 BCC_Device_Addr;

for (BCC_Device_Addr = 1; BCC_Device_Addr <= BCC_DEVICE_CNT; BCC_Device_Addr++) {
// Check if balancing is enabled for the module
if (module_bal_list[BCC_Device_Addr - 1]) {
GlobalBalConfig->BalChannels0En = cell_masks_bal[BCC_Device_Addr - 1];
GlobalBalConfig->BalSwitchMon0En = cell_masks_bal[BCC_Device_Addr - 1];

// Set global balance configuration
Status |= Bcc_774a_BAL_SetGlobalConfiguration(BCC_CHAIN_ADDR, BCC_Device_Addr, GlobalBalConfig, &BmsTDCfg_Tpl3);

Status |= Bcc_774a_BAL_GetStatus(BCC_CHAIN_ADDR,BCC_Device_Addr,&BmsTDCfg_Tpl3);
if (Status != E_OK) {
// Debug or log the failing device
return ERROR_SET_GLOBAL_BALANCE_FAILED;
}
}

if(PhyError != PHY_NO_ERROR)
{
return ERROR_CMU_START_MEASUREMENT_TD_SEND;
}
// Clear TD configuration
Status |= Bms_TD_Clear(&BmsTDCfg_Tpl3);
}
return NO_ERROR;
}

and later in main.c i am calling it as 

Bcc_774a_BalConfigurationType GlobalMinimumSet = {
    .CCMBal = false,                 // Disable constant current balancing
    .GlobalUvBal = false,             // Enable global undervoltage balancing
    .CellUvBal = false,              // Disable individual cell undervoltage balancing
    .TimerBasedBal = true,           // Enable timer-based balancing
    .TmpBalEn = false,               // Disable temperature-based balancing
    .Tmpsrc=BCC_774A_BAL_TMP_SOURCE_AIN0, // Temperature source: AIN0
    .PreBalTimer = 0x0000,           // Pre-balancing timer: disabled
    .GlobalBalTimer = 0xFFFF,        // Maximum global balancing timer
    .BalChannels0En = 0x0000,        // Enable balancing for channels 0 to 7
    .BalChannels1En = 0x0000,        // Disable balancing for channels 16 and 17
    .BalSwitchMon0En = 0x0000,       // Enable balancing monitoring for channels 0 to 7
    .BalSwitchMon1En = 0x0000,       // Disable monitoring for channels 16 and 17
    .PWMCycleVoltage = 0xFF          // Set PWM cycle voltage to 100%
};
boolean module_bal_list[5] = {0,0,0,0,1};
uint16 cell_masks_bal[5] = {0x0000,0x0000,0x0000,0x0000,0x0FFF} ;

GeneralError = global_bal(&GlobalMinimumSet, module_bal_list, cell_masks_bal);
if(GeneralError != NO_ERROR)
{
Status = E_NOT_OK;
/* Update LED state */
Led_Update(GeneralError, BmsState);
break;
}

 But it is not working as expected
I am able to successfully flash code and notice no errors (by leds and freemaster)
but the cells are not discharging

Please help

[Robin_Shen]

Hi

Which example are you referring to?
Does the unmodified example work properly?

Best Regards,
Robin

[avenkat]

HI

I have written a custom code by myself with the help functions present in bcc774a library
This is written on top of hvbms800 bring up example

I feel i am missing out a few TD handlers
it would be great if there is any demo on how to use the TD ,specifically in this case

[Robin_Shen]

Sorry, It is out of scope of our online technical support.  Please contact your local NXP Distributor or FAE for assistance.