您好：
我们目前正在实施一个升压转换器、该转换器需要钳制 PWMH 占空比。 目前、我的方法是使用 CMPSS 模块+ ePWM XBAR + DC +跳匣区域 CBC 来完成。 然而、在 CBC 被触发后、PWMH 端的波形将有一个额外的错误波形。 键入、下图是我的 F28075 SysConfig 和实验图片。
您好、Ryan
下图是我们需要的 PWM 波和我们的 PWM 设置。 Thx~μ s
EPWM_setEmulationMode(myEPWM7_BASE, EPWM_EMULATION_FREE_RUN);
EPWM_setClockPrescaler(myEPWM7_BASE, EPWM_CLOCK_DIVIDER_1, EPWM_HSCLOCK_DIVIDER_1);
EPWM_setTimeBasePeriod(myEPWM7_BASE, 600);
EPWM_setTimeBaseCounter(myEPWM7_BASE, 0);
EPWM_setTimeBaseCounterMode(myEPWM7_BASE, EPWM_COUNTER_MODE_UP);
EPWM_disablePhaseShiftLoad(myEPWM7_BASE);
EPWM_setPhaseShift(myEPWM7_BASE, 0);
EPWM_setSyncOutPulseMode(myEPWM7_BASE, EPWM_SYNC_OUT_PULSE_ON_COUNTER_ZERO);
EPWM_setCounterCompareValue(myEPWM7_BASE, EPWM_COUNTER_COMPARE_A, 600);
EPWM_setCounterCompareShadowLoadMode(myEPWM7_BASE, EPWM_COUNTER_COMPARE_A, EPWM_COMP_LOAD_ON_CNTR_ZERO);
EPWM_setCounterCompareValue(myEPWM7_BASE, EPWM_COUNTER_COMPARE_B, 48);
EPWM_setCounterCompareShadowLoadMode(myEPWM7_BASE, EPWM_COUNTER_COMPARE_B, EPWM_COMP_LOAD_ON_CNTR_ZERO);
EPWM_setCounterCompareValue(myEPWM7_BASE, EPWM_COUNTER_COMPARE_C, 181);
EPWM_setCounterCompareValue(myEPWM7_BASE, EPWM_COUNTER_COMPARE_D, 300);
EPWM_setActionQualifierT1TriggerSource(myEPWM7_BASE, EPWM_AQ_TRIGGER_EVENT_TRIG_DCA_2);
EPWM_setActionQualifierT2TriggerSource(myEPWM7_BASE, EPWM_AQ_TRIGGER_EVENT_TRIG_DCA_2);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);
EPWM_setActionQualifierT1TriggerSource(myEPWM7_BASE, EPWM_AQ_TRIGGER_EVENT_TRIG_DCA_2);
EPWM_setActionQualifierT2TriggerSource(myEPWM7_BASE, EPWM_AQ_TRIGGER_EVENT_TRIG_DCA_2);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);
EPWM_setActionQualifierAction(myEPWM7_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_T1_COUNT_UP);
EPWM_setTripZoneAction(myEPWM7_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
EPWM_setTripZoneAction(myEPWM7_BASE, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW);
EPWM_setTripZoneAction(myEPWM7_BASE, EPWM_TZ_ACTION_EVENT_DCAEVT1, EPWM_TZ_ACTION_DISABLE);
EPWM_setTripZoneAction(myEPWM7_BASE, EPWM_TZ_ACTION_EVENT_DCAEVT2, EPWM_TZ_ACTION_DISABLE);
EPWM_setTripZoneAction(myEPWM7_BASE, EPWM_TZ_ACTION_EVENT_DCBEVT1, EPWM_TZ_ACTION_DISABLE);
EPWM_setTripZoneAction(myEPWM7_BASE, EPWM_TZ_ACTION_EVENT_DCBEVT2, EPWM_TZ_ACTION_DISABLE);
EPWM_enableTripZoneSignals(myEPWM7_BASE, EPWM_TZ_SIGNAL_DCAEVT2);
EPWM_selectDigitalCompareTripInput(myEPWM7_BASE, EPWM_DC_TRIP_TRIPIN4, EPWM_DC_TYPE_DCAH);
EPWM_selectDigitalCompareTripInput(myEPWM7_BASE, EPWM_DC_TRIP_TRIPIN4, EPWM_DC_TYPE_DCAL);
EPWM_setTripZoneDigitalCompareEventCondition(myEPWM7_BASE, EPWM_TZ_DC_OUTPUT_A2, EPWM_TZ_EVENT_DCXL_HIGH);
EPWM_setDigitalCompareEventSource(myEPWM7_BASE, EPWM_DC_MODULE_A, EPWM_DC_EVENT_1, EPWM_DC_EVENT_SOURCE_FILT_SIGNAL);
EPWM_setDigitalCompareEventSource(myEPWM7_BASE, EPWM_DC_MODULE_A, EPWM_DC_EVENT_2, EPWM_DC_EVENT_SOURCE_FILT_SIGNAL);
EPWM_selectDigitalCompareTripInput(myEPWM7_BASE, EPWM_DC_TRIP_TRIPIN4, EPWM_DC_TYPE_DCBH);
EPWM_selectDigitalCompareTripInput(myEPWM7_BASE, EPWM_DC_TRIP_TRIPIN4, EPWM_DC_TYPE_DCBL);
EPWM_setDigitalCompareFilterInput(myEPWM7_BASE, EPWM_DC_WINDOW_SOURCE_DCAEVT2);
EPWM_enableDigitalCompareBlankingWindow(myEPWM7_BASE);
EPWM_setDigitalCompareBlankingEvent(myEPWM7_BASE, EPWM_DC_WINDOW_START_TBCTR_ZERO);
EPWM_setDigitalCompareWindowOffset(myEPWM7_BASE, 576);
EPWM_setDigitalCompareWindowLength(myEPWM7_BASE, 84);
EPWM_setDeadBandDelayPolarity(myEPWM7_BASE, EPWM_DB_FED, EPWM_DB_POLARITY_ACTIVE_LOW);
EPWM_setDeadBandDelayMode(myEPWM7_BASE, EPWM_DB_RED, true);
EPWM_setRisingEdgeDelayCount(myEPWM7_BASE, 12);
EPWM_setDeadBandDelayMode(myEPWM7_BASE, EPWM_DB_FED, true);
EPWM_setFallingEdgeDelayCount(myEPWM7_BASE, 12);
EPWM_setDeadBandOutputSwapMode(myEPWM7_BASE, EPWM_DB_OUTPUT_A, true);
EPWM_setDeadBandOutputSwapMode(myEPWM7_BASE, EPWM_DB_OUTPUT_B, true);
EPWM_enableInterrupt(myEPWM7_BASE);
EPWM_setInterruptSource(myEPWM7_BASE, EPWM_INT_TBCTR_U_CMPD);
EPWM_setInterruptEventCount(myEPWM7_BASE, 1);
EPWM_enableADCTrigger(myEPWM7_BASE, EPWM_SOC_A);
EPWM_setADCTriggerSource(myEPWM7_BASE, EPWM_SOC_A, EPWM_SOC_TBCTR_U_CMPC);
EPWM_setADCTriggerEventPrescale(myEPWM7_BASE, EPWM_SOC_A, 1); 您好、Ryan
1.我们的程序在 TBPRD 为零时清除 CBC 跳闸区标志。
2.下面的图片是 outputxbar,但它总是拉高。
尊敬的 Poyi：
在 SYSCFG 中、您已启用 CMPD 来触发 ISR。 您是否采取了任何措施来影响此 ISR 内的输出？
此外、我还编辑了您提供的示波器图片、我标记的这些标记是否正确？ 您交换了1A 和1B 的输出。 橙色波形为1B、绿色波形为1A 正确吗？ CMPA 之前似乎发生了某种情况、这种情况会导致输出再次变为高电平然后变为低电平。 我希望确保首先了解您的波形。 消隐窗口从 TBCTR = 0开始、然后在 CMPA 周围开始消隐。 576 + 84 TBCLK 计数。 我想知道您是否更改消隐窗口的偏移、以查看此脉冲是否发生移动？ 您是否使用定制的 PCB、CC 或 LaunchPad？
此致！
Ryan Ma
您好，Ryan：
很抱歉我之前的描述不够清楚、我重新进行了实验。
CMPD 仅用于触发 CLA 任务、没有其他用途。
我们实现了二极管仿真。 下图显示了我们实验的实际波形。 PWMA 和 PWMB 直通 DB 模块的输出交换、因此 A 输出和 B 输出交换。 消隐窗口设置的值可动态调整、消隐时间= CMPA 点+84。 本实验的目的是在电感电流低于5A 时关闭 PWMB 输出、但在每个 PWM 周期结束时都会出现错误波形。
如下图所示、死区设置的错误波形位置正好为200ns、可以帮助我确认是死区导致 PWM 错误还是设置有误、谢谢。
您好、Ryan：
我们使用 定制 PCB。
在图片下方、我将死区从200ns 增加到400ns。
我认为是死区模块问题。
