TMS320F280049: 请教一下用CBC 模式进行逐波限流如何配置

SHENG YI

Part Number: TMS320F280049
Other Parts Discussed in Thread: TIDM-DC-DC-BUCK

这是我的CMPSS

void CMPSS_Init(Uint16 base1,Uint16 u16DacHigh,Uint16 u16DacLow)
{
    // Enable CMPSS1
    CMPSS_enableModule(base1);
    // Use VDDA as the reference for comparator DACs
    CMPSS_configDAC(base1,CMPSS_DACVAL_SYSCLK |CMPSS_DACREF_VDDA |CMPSS_DACSRC_SHDW);
    // Set DAC to H and L values
    CMPSS_setDACValueHigh(base1, u16DacHigh);
    // Make sure the asynchronous path compare high and low event
    // does not go to the OR gate with latched digital filter output
    // hence no additional parameter CMPSS_OR_ASYNC_OUT_W_FILT  is passed
    // comparator oputput is "not" inverted for high compare event
    CMPSS_configHighComparator(base1, CMPSS_INSRC_DAC);
    // Comparator output is inverted for for low compare event
    CMPSS_configFilterHigh(base1, 2, 10, 7);
    // Reset filter logic & start filtering
    CMPSS_initFilterHigh(base1);
    // Configure CTRIPOUT path
    CMPSS_configOutputsHigh(base1, CMPSS_TRIP_FILTER | CMPSS_TRIPOUT_FILTER);
    // Comparator hysteresis control , set to 2x typical value
    CMPSS_setHysteresis(base1, 0);
    // Clear the latched comparator events
    CMPSS_clearFilterLatchHigh(base1);
}

这是CBC模式配置代码

    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP4MUX0TO15CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP4MUX16TO31CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP4MUXENABLE) = 0x0000;

    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP5MUX0TO15CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP5MUX16TO31CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP5MUXENABLE) = 0x0000;

    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP7MUX0TO15CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP7MUX16TO31CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP7MUXENABLE) = 0x0000;

    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP8MUX0TO15CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP8MUX16TO31CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP8MUXENABLE) = 0x0000;


    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP9MUX0TO15CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP9MUX16TO31CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP9MUXENABLE) = 0x0000;

    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP10MUX0TO15CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP10MUX16TO31CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP10MUXENABLE) = 0x0000;

    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP11MUX0TO15CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP11MUX16TO31CFG) = 0x0000;
    HWREG(EPWMXBAR_BASE + XBAR_O_TRIP11MUXENABLE) = 0x0000;


    // CMPSS2
    //XBAR_EPWM_MUX00_CMPSS1_CTRIPH
    XBAR_setEPWMMuxConfig(XBAR_TRIP4, XBAR_EPWM_MUX00_CMPSS1_CTRIPH);
    // Enable Mux 0 to generate TRIP4
    XBAR_enableEPWMMux(XBAR_TRIP4, XBAR_MUX00);

    // CMPSS5
    //XBAR_EPWM_MUX08_CMPSS5_CTRIPH
    XBAR_setEPWMMuxConfig(XBAR_TRIP5, XBAR_EPWM_MUX08_CMPSS5_CTRIPH);
    // Enable Mux 0 to generate TRIP5
    XBAR_enableEPWMMux(XBAR_TRIP5, XBAR_MUX08);

   // Trip 4 is the input to the DCAHCOMPSEL
    EPWM_selectDigitalCompareTripInput(EPWM1_BASE,EPWM_DC_TRIP_TRIPIN4,EPWM_DC_TYPE_DCAH);
    // Trigger event when DCBH is high
    EPWM_setTripZoneDigitalCompareEventCondition(EPWM1_BASE,EPWM_TZ_DC_OUTPUT_A2,EPWM_TZ_EVENT_DCXH_HIGH);
    // 设置DCB的路径为异步非滤波
    EPWM_setDigitalCompareEventSource(EPWM1_BASE,EPWM_DC_MODULE_A,EPWM_DC_EVENT_2,EPWM_DC_EVENT_SOURCE_ORIG_SIGNAL);
    //! 设置数字比较输入同步模式。
    EPWM_setDigitalCompareEventSyncMode(EPWM1_BASE,EPWM_DC_MODULE_A,EPWM_DC_EVENT_2,EPWM_DC_EVENT_INPUT_SYNCED);


    EPWM_selectDigitalCompareTripInput(EPWM6_BASE,EPWM_DC_TRIP_TRIPIN5,EPWM_DC_TYPE_DCAH);
    // Trigger event when DCBH is high
    EPWM_setTripZoneDigitalCompareEventCondition(EPWM6_BASE,EPWM_TZ_DC_OUTPUT_A2,EPWM_TZ_EVENT_DCXH_HIGH);
    // 设置DCB的路径为异步非滤波
    EPWM_setDigitalCompareEventSource(EPWM6_BASE,EPWM_DC_MODULE_A,EPWM_DC_EVENT_2,EPWM_DC_EVENT_SOURCE_ORIG_SIGNAL);
    //! 设置数字比较输入同步模式。
    EPWM_setDigitalCompareEventSyncMode(EPWM6_BASE,EPWM_DC_MODULE_A,EPWM_DC_EVENT_2,EPWM_DC_EVENT_INPUT_SYNCED);
    EPWM_enableTripZoneSignals(EPWM1_BASE,EPWM_TZ_SIGNAL_DCAEVT2);
    EPWM_enableTripZoneSignals(EPWM6_BASE,EPWM_TZ_SIGNAL_DCAEVT2);

    EPWM_setTripZoneAction(EPWM1_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
    EPWM_setTripZoneAction(EPWM6_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
    // 设置DCB CBC
    EPWM_clearTripZoneFlag(EPWM1_BASE, EPWM_TZ_FLAG_DCAEVT2);
    EPWM_clearTripZoneFlag(EPWM6_BASE, EPWM_TZ_FLAG_DCAEVT2);
    EPWM_clearTripZoneFlag(EPWM1_BASE, EPWM_TZ_FLAG_CBC);
    EPWM_clearTripZoneFlag(EPWM6_BASE, EPWM_TZ_FLAG_CBC);

这是加入CBC配置后开关频率由50K 180°交错改变为25K 90°交错。波形图如下

2 年多前

0 Cherry Zhou 2 年多前

TI__Guru* 81370 points

您好我们已收到您的问题并升级到英文论坛寻求帮助，如有答复将尽快回复您。谢谢！

0 Cherry Zhou 2 年多前回复 Cherry Zhou

TI__Guru* 81370 points

您好，为了更好地解决您的问题，您能否提供下您想要实现的 XBAR 和 CMPSS 配置的方框图？此外，请问您期望看到的波形是什么？

0 SHENG YI 2 年多前回复 Cherry Zhou

XBAR的配置在CBC配置的代码中L31-41行中

下面这个是模拟端的配置

void ASysCtl_Init(void)
{
    //CMPSS Number configure ---- CMPHP2 and CMPLP2
    ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_1,2);
    ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_1,2);

    ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_2,2);
    ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_2,2);

    ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_3,2);
    ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_3,2);

    ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_4,2);
    ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_4,2);

    ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_5,2);
    ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_5,2);

    ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_6,2);
    ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_6,2);

    ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_7,2);
    ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_7,2);
}

我想用280049的CBC功能来进行逐波限流，目前遇到的问题是进行CBC配置后，超过设定的比较值之后开关频率由50K 降到了25K ，并且由原来的两路180°交错导通变成了90°交错。不知道是什么原因导致中间丢失了一个PWM波。

我希望使用CBC功能后开关频率是还是50K 两路180°交错的波形。

我不知道我的代码这样配置有没有问题，请帮忙看一看，谢谢！

0 Cherry Zhou 2 年多前回复 SHENG YI

TI__Guru* 81370 points

您好，请问下您为什么希望 CBC 跳闸在每个周期对 PWM 波形进行操作？您是在尝试实施某种峰值电流模式控制 (PCMC) 方案吗？如果是的话，能否分享下拓扑和控制方案？

您可以参考 TIDM-DC-DC-BUCK参考设计，了解如何使用 C2000 CMPSS 、 XBAR 和 ePWM 模块实施 PCMC。可从Digital Power SDK访问参考设计的软件。

0 SHENG YI 2 年多前回复 Cherry Zhou

你好，这个功能目前想用于180°交错BUCK拓扑中，开关频率50K；想用CBC功能做逐波限流；想用CBC实现：当当前周期电感电流大于设定阈值时，关闭PWM，下一个周期重新打开PWM。

TIDM-DC-DC-BUCK的PCMC的代码我也看过，我想请教一下我上传的关于CMPSS、XBAR和CBC配置代码有没有问题

0 Cherry Zhou 2 年多前回复 SHENG YI

TI__Guru* 81370 points

好的感谢您提供的信息，因清明节假期，预计答复您的时间将会稍晚，敬请谅解！

0 Cherry Zhou 2 年多前回复 Cherry Zhou

TI__Guru* 81370 points

您好，您看下以下参考设计：

https://www.ti.com/tool/TIDM-DC-DC-BUCK

以下示例软件您也可以参考下，都可以帮助您更好地了解这个套件：

https://www.ti.com/tool/C2000WARE-DIGITALPOWER-SDK

您可以看到我们是如何实现上述内容的，并相应地调整您的代码。

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TMS320F280049: 请教一下用CBC 模式进行逐波限流如何配置