【BMS】BJB MC33772 电流测量

news2024/11/17 19:36:00

一、硬件准备

1、主控板子：S32K312 板子

2、BJB 板子：MC33772 BJB 板子

3、硬件连接：

两个板子独立 12V 供电，外部电流接线流经分流器 Shunt ,分流器方向从下往上流向得到正值数据。

4、BJB 测量电流电路注意事项

① 板子上预留的外部电压模拟测试电流采样电路需要去掉，如下图，BJB 板子电路图如示意图一致

二、软件准备

1、S32DS 软件 IDE

2、软件包获取：

① 进入官网下载，Go on Package manager webpage.

② 勾选 S32K344 HVBMS ，然后下载

3、环境安装

S32K312 以及 S32 DS 安装环境查看《BMS_SWInstalationGuide_Hvbms_2024.pdf》，在上述官网页面点击下图位置，即可下载用户指导手册，按照手册一步步下载安装即可完成环境的安装

4、软件更改

芯片更换为 S32K312 ，上述已经下载了 S32K344 的 BMS 例程，按照 S32K344 的 EB tresos 配置，在S32K312 的例程上，直接在 EB tresos 更改外设，添加 MC33772 ,MC33665 对应的组件即可，如下图，其他外设配置可以参考 S32K344 例程。（如客户及用户此步骤无法操作，可以联系我们 WPI ATU ，在允许的情况下可以提供这套移植好的 demo）

三、测量电流软件流程

1、查看数据手册

《ds633730 - MC33772C Datasheet.pdf》里面有提示：电流采样使能后至少等待 2.7us 后才能进行 ADC 转化。

2、 ADC 采样配置

配置 ADC 采样平均次数，次数越高采样时间越长，在 EB 配置当中，ADC2 的采样分辨率设置为 15bit

3、查看代码配置，进行修改：先使能电流采样，再进行 ADC 转换

HVBMS_Errors Bjb_StartMeas(void)
{
    Std_ReturnType Status = E_OK;
    /* Clear TD */
    Status = Bms_TD_Clear(&BmsTDCfg_Tpl2);
    
    /* Start measurements */
Status |= Bcc_772c_CC_ControlMeasurements(BCC_772C_ALL_CHAIN_TPL, BCC_772C_ALL_DEVICE_TPL, BCC_772C_CC_START, &BmsTDCfg_Tpl2);

/* Add 2 ms delay to wait for the device to finish current measurement */
Status |= Bms_TD_InsertPhyEvent(&BmsTDCfg_Tpl2, PHY_TIMER, 2000U);
Status |= Bcc_772c_COM_InsertNop(BS_CHAIN_ADDR, 1, &BmsTDCfg_Tpl2);

/* Call Bcc_772c_Send */
Status |= Bms_TD_Send(&BmsTDCfg_Tpl2, &PhyError);
if(Status != E_OK)
{
return ERROR_BJB_START_MEASUREMENTS_TD_FILL;
}

/* Wait until PHY processes the request */
Td_Wait(&BmsTDCfg_Tpl2);
if(PhyError != PHY_NO_ERROR)
{
return ERROR_BJB_START_MEASUREMENTS_TD_SEND;
}

/* Clear TD */
Status = Bms_TD_Clear(&BmsTDCfg_Tpl2);

Status |= Bcc_772c_MSR_StartConversion(BCC_772C_ALL_CHAIN_TPL, BCC_772C_ALL_DEVICE_TPL, MC33772C_ADC_CFG_AVG_8_SAMPLES_ENUM_VAL, &BmsTDCfg_Tpl2);
/* Add 2 ms delay to wait for the device to finish current measurement */
Status |= Bms_TD_InsertPhyEvent(&BmsTDCfg_Tpl2, PHY_TIMER, 2000U);
Status |= Bcc_772c_COM_InsertNop(BS_CHAIN_ADDR, 1, &BmsTDCfg_Tpl2);

/* Call Bcc_772c_Send */
Status |= Bms_TD_Send(&BmsTDCfg_Tpl2, &PhyError);
if(Status != E_OK)
{
return ERROR_BJB_START_MEASUREMENTS_TD_FILL;
}

/* Wait until PHY processes the request */
Td_Wait(&BmsTDCfg_Tpl2);
if(PhyError != PHY_NO_ERROR)
{
return ERROR_BJB_START_MEASUREMENTS_TD_SEND;
}

/* Clear TD */
Status = Bms_TD_Clear(&BmsTDCfg_Tpl2);
return NO_ERROR;
}

4、读取数据

HVBMS_Errors Bjb_ReadMeasurementsResults(BjbMeasurementType MeasurementType)
{
        volatile Std_ReturnType Status = E_OK;
        uint8 BS_Device_Addr;
        Bcc_772c_CcISenseValueType CcIsense[BS_DEVICE_CNT];
        //Bjb_ReadIsolation();

        Status = Bms_TD_Clear(&BmsTDCfg_Tpl2);
        uint16 CurrentData[BS_DEVICE_CNT][5] = {0,0};
        /* Start measurements */
        do
        {
                /* Read current measurements */
                if(MeasurementType == BJB_CURRENT_MEASUREMENT)
                {
                        //delay 10ms
                        Status |= Bms_TD_InsertPhyEvent(&BmsTDCfg_Tpl2, PHY_TIMER, 5000);
                        Status |= Bcc_772c_CC_ControlMeasurements(BCC_772C_ALL_CHAIN_TPL, BCC_772C_ALL_DEVICE_TPL, BCC_772C_CC_RESTART, &BmsTDCfg_Tpl2);
                        /* Add 2 ms delay to wait for the device to finish current measurement */
                        Status |= Bms_TD_InsertPhyEvent(&BmsTDCfg_Tpl2, PHY_TIMER, 2000U);
                        Status |= Bcc_772c_COM_InsertNop(BS_CHAIN_ADDR, 1, &BmsTDCfg_Tpl2);

                        /* Call Bcc_772c_Send */
                        Status |= Bms_TD_Send(&BmsTDCfg_Tpl2, &PhyError);
                        if(Status != E_OK)
                        {
                                return ERROR_BJB_START_MEASUREMENTS_TD_FILL;
                        }

                        /* Wait until PHY processes the request */
                        Td_Wait(&BmsTDCfg_Tpl2);
                        if(PhyError != PHY_NO_ERROR)
                        {
                                return ERROR_BJB_START_MEASUREMENTS_TD_SEND;
                        }

                        /* Clear TD */
                        Status = Bms_TD_Clear(&BmsTDCfg_Tpl2);

                        for(BS_Device_Addr = 1; BS_Device_Addr <= BS_DEVICE_CNT; BS_Device_Addr++)
                        {
                            Status |= Bcc_772c_CC_GetData(BS_CHAIN_ADDR, BS_Device_Addr, &BmsTDCfg_Tpl2);
                        }
                        Status |= Bms_TD_Send(&BmsTDCfg_Tpl2, &PhyError);
                        if(Status != E_OK)
                        {
                                return ERROR_BJB_READ_MEASUREMENTS_CURRENT_TD_FILL;
                        }

                        /* Wait until PHY processes the request */
                        Td_Wait(&BmsTDCfg_Tpl2);
                        if(PhyError != PHY_NO_ERROR)
                        {
                            return ERROR_BJB_READ_MEASUREMENTS_CURRENT_TD_SEND;
                        }
                        /* Check DATA_RDY bits for current measurements */
                        if( ((((BmsTDCfg_Tpl2).PhyTD)->Response).Data[9] & 0x8000)&
                            ((((BmsTDCfg_Tpl2).PhyTD)->Response).Data[12] & 0x8000)&
                                ((((BmsTDCfg_Tpl2).PhyTD)->Response).Data[24] & 0x8000)&
                                ((((BmsTDCfg_Tpl2).PhyTD)->Response).Data[27] & 0x8000) )
                        {
                            Status = E_OK;
                        }
                        else
                            Status = E_NOT_OK;
                        
                        if(Status != E_OK)
                        {
                            return ERROR_BJB_READ_MEASUREMENTS_CURRENT_VALUE_EXTRACT;
                        }
                        
                        /* Read current measurements */
                        for(BS_Device_Addr = 1; BS_Device_Addr <= BS_DEVICE_CNT; BS_Device_Addr++)
                        {
                            /* RShunt 100 uOhm */
                            CcIsense[BS_Device_Addr-1].RShunt = RSHUNT;
                            Status |= Bcc_772c_CC_ExtractISense(BS_CHAIN_ADDR, BS_Device_Addr, &CcIsense[BS_Device_Addr-1], &BmsTDCfg_Tpl2);
                            PackCurrent[BS_Device_Addr-1] = CcIsense[BS_Device_Addr-1].ISense;//单位 mA
                        }
                        break;
                }      
        } while(0);
    Status = Bms_TD_Clear(&BmsTDCfg_Tpl2);

    return NO_ERROR;
}