您好！这是一个H桥变换器拓扑，目前做电池到母线的降压放电。二通道是BUCK的主控驱动。电压采样连接到比较器的输入上。目前保护触发阈值是50V
如图所示，增加电压输出到52V之后，驱动脉宽先变窄，然后过了几十us后，又打出一个不完整的驱动，请问这是为什么？
将电压下降到49V后，恢复波形如图:
驱动的恢复也不是连贯的，请问这是为什么呢？
配置代码:
/* configure DigitalCompare SubModule. */
void InitEPWMDigitalCompare(uint16_t Index)
{
// select which trip sourse as the input of DC submodule. TRIP4 -> DCAH & TRIP4 -> DCBH
EPWM_enableDigitalCompareTripCombinationInput(EpwmBspCfg[Index].Base, EpwmBspCfg[Index].DCInputSig, EPWM_DC_TYPE_DCAH);
EPWM_enableDigitalCompareTripCombinationInput(EpwmBspCfg[Index].Base, EpwmBspCfg[Index].DCInputSig, EPWM_DC_TYPE_DCBH);
// Configure the DCA/DCB path to be unfiltered and asynchronous
EPWM_setDigitalCompareEventSource(EpwmBspCfg[Index].Base, EPWM_DC_MODULE_A, EPWM_DC_EVENT_2, EPWM_DC_EVENT_SOURCE_ORIG_SIGNAL);
EPWM_setDigitalCompareEventSource(EpwmBspCfg[Index].Base, EPWM_DC_MODULE_B, EPWM_DC_EVENT_2, EPWM_DC_EVENT_SOURCE_ORIG_SIGNAL);
}
/* configure TripZone SubModule */
void InitEPWMTripZone(uint16_t Index)
{
EPWM_enableTripZoneSignals(EpwmBspCfg[Index].Base, (EPWM_TZ_SIGNAL_DCAEVT2 | EPWM_TZ_SIGNAL_DCBEVT2));// // 启用 ePWMx 的 Cycle-by-Cycle 保护
// Trigger event when DCAH/DCBH is high
EPWM_setTripZoneDigitalCompareEventCondition(EpwmBspCfg[Index].Base, EPWM_TZ_DC_OUTPUT_A2, EPWM_TZ_EVENT_DCXH_HIGH); //留意是否为A2 10.17修改为A2
EPWM_setTripZoneDigitalCompareEventCondition(EpwmBspCfg[Index].Base, EPWM_TZ_DC_OUTPUT_B2, EPWM_TZ_EVENT_DCXH_HIGH); //同上
EPWM_setTripZoneAction(EpwmBspCfg[Index].Base, EPWM_TZ_ACTION_EVENT_DCAEVT2, EPWM_TZ_ACTION_LOW);// Configure ePWM1A to output LOW on TZA TRIP
EPWM_setTripZoneAction(EpwmBspCfg[Index].Base, EPWM_TZ_ACTION_EVENT_DCBEVT2, EPWM_TZ_ACTION_LOW);// Configure ePWM1B to output LOW on TZB TRIP
EPWM_clearTripZoneFlag(EpwmBspCfg[Index].Base, (EPWM_TZ_INTERRUPT | EPWM_TZ_FLAG_CBC | EPWM_TZ_FLAG_DCAEVT2 | EPWM_TZ_FLAG_DCBEVT2));// Clear trip flags
EPWM_enableTripZoneInterrupt(EpwmBspCfg[Index].Base, EPWM_TZ_INTERRUPT_CBC);// Enable TZ interrupt 不确定是否是EPWM_TZ_INTERRUPT_CBC
}
/* enable EPWM1 ~ EPWM4 TripZone Sub-Module */
void EnableEPWMTipZoneInterrupt(void)
{
for(uint8_t Index = EPWM_BASE1; Index < EPWM_MOD_MAX; Index++)
{
EPWM_clearTripZoneFlag(EpwmBspCfg[Index].Base, (EPWM_TZ_INTERRUPT | EPWM_TZ_FLAG_CBC | EPWM_TZ_FLAG_DCAEVT2 | EPWM_TZ_FLAG_DCBEVT2));// Clear trip flags
EPWM_enableTripZoneInterrupt(EpwmBspCfg[Index].Base, EPWM_TZ_INTERRUPT_CBC );// Enable TZ interrupt
}
Interrupt_enable(INT_EPWM4_TZ);
Interrupt_enable(INT_EPWM2_TZ);
Interrupt_enable(INT_EPWM7_TZ);
Interrupt_enable(INT_EPWM1_TZ);
}
/* epwm7TZISR - ePWM7 TZ ISR */
__interrupt void epwm7TZISR(void)
{
// DisableEPWMTipZoneInterrupt();
EPWM_clearTripZoneFlag(EPWM7_BASE, EPWM_TZ_INTERRUPT_CBC);// To re-enable the Interrupts
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP2);// Acknowledge this interrupt to receive more interrupts from group 2
}
/* InitCMPSSHigh - Function to configure the high comparator of CMPSSx */
void InitCMPSSHigh(uint16_t Idx)
{
CMPSS_configHighComparator(CMPSScfg[Idx].Base, CMPSS_INSRC_DAC);// Configure the negative input signal to come from the DAC
CMPSS_setDACValueHigh(CMPSScfg[Idx].Base, CMPSScfg[Idx].DACVal_H);// Set DAC value to specified point.
// Configure digital filter.
// clock prescale = SYSCLK/(7+1), sample window size = 6+1 samples, threshold value = 6+1.
CMPSS_configFilterHigh(CMPSScfg[Idx].Base, CMPSScfg[Idx].ClkPrescale, CMPSScfg[Idx].SampWindow, CMPSScfg[Idx].SampWindow);
CMPSS_initFilterHigh(CMPSScfg[Idx].Base);// Initialize the filter logic and start filtering
// Configure the output signals.
CMPSS_configOutputsHigh(CMPSScfg[Idx].Base, CMPSS_TRIP_ASYNC_COMP);// CTRIPH will be fed by the asynchronous comparator output.
CMPSS_configOutputsHigh(CMPSScfg[Idx].Base, CMPSS_TRIP_FILTER);// CTRIPH will be fed by the filter output.
}