TMS320F280039C: TIDA-010062参考设计LLC的EPWM配置疑问

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Prodigy 60 points

Part Number: TMS320F280039C
Other Parts Discussed in Thread: TIDA-010062, SFRA

各位专家好！

关于TIDA-010062（基于F28003x）参考设计LLC的EPWM配置，有些问题要请教下：

1、函数void LLC_HAL_setupPWM(void)中调用了LLC_HAL_setupPWM_upDownCount函数，该函数配置了EPWM1和EPWM2，对于其中的周期值配置有些不理解，如下：

EPWM_setTimeBasePeriod(base, LLC_PERIOD_INIT_TICKS / 2);

#define LLC_PERIOD_INIT_TICKS (uint32_t)286

按照EPWM的时钟配置为120MHz，这个EPWM的开关频率是不是太高了？

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//
// LLC_HAL_setupPWM() - configures the primary and secondary switching
// for the LLC converter.
//
void LLC_HAL_setupPWM(void)
{
    //
    // Configure primary switching for LLC stage - PH1, PRI
    // Configure synchronous rectification - PH1, SEC
    // Set the PWMs in a disabled state
    //
    LLC_HAL_setupPWM_upDownCount(LLC_PRI_PWM_BASE,
                                 EPWM_SYNC_IN_PULSE_SRC_DISABLE,
                                 1,
                                 LLC_PERIOD_INIT_TICKS / 2 - 1,//CMPB = (286/2) -1
                                 LLC_DBRED_PRI_INIT,
                                 LLC_DBFED_PRI_INIT);
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//
// LLC_HAL_setupPWM() - configures the primary and secondary switching
// for the LLC converter.
//

void LLC_HAL_setupPWM(void)
{
    //
    // Configure primary switching for LLC stage - PH1, PRI
    // Configure synchronous rectification - PH1, SEC
    // Set the PWMs in a disabled state
    //


    LLC_HAL_setupPWM_upDownCount(LLC_PRI_PWM_BASE,
                                 EPWM_SYNC_IN_PULSE_SRC_DISABLE,
                                 1,
                                 LLC_PERIOD_INIT_TICKS / 2 - 1,//CMPB = (286/2) -1
                                 LLC_DBRED_PRI_INIT,
                                 LLC_DBFED_PRI_INIT);

    LLC_HAL_setupPWM_upDownCount(LLC_SEC_PWM_BASE,
                                 EPWM_SYNC_IN_PULSE_SRC_SYNCOUT_EPWM1,
                                 LLC_PERIOD_INIT_TICKS / 2 - 11,//(286/2) -1
                                 10,//CMPB = 10
                                 LLC_DBRED_SEC_INIT,
                                 LLC_DBFED_SEC_INIT);
    LLC_HAL_disablePhase(LLC_PRI_PWM_BASE, LLC_SEC_PWM_BASE);

    //
    // Configure the action qualifier submodules for primary switching and
    // synchronous rectification to give 180 degree phase shift between the
    // two interleaved phases.
    //

    //
    // === Action Qualifier SubModule - PH1, PRI === //
    //
    // EPWMA low on CTR = 0
    // EPWMA high on CTR = CMPA, in up-count mode
    // EPWMA low on CTR = PRD
    //
    // EPWMB AQ output is inverted by DB for RED on EPWMB output
    // EPWMB high on CTR = 0
    // EPWMB high on CTR = PRD
    // EPWMB low on CTR = CMPB, in down-count mode
    //
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_A,
                                  EPWM_AQ_OUTPUT_LOW,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_A,
                                  EPWM_AQ_OUTPUT_HIGH,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_A,
                                  EPWM_AQ_OUTPUT_LOW,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_B,
                                  EPWM_AQ_OUTPUT_HIGH,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_B,
                                  EPWM_AQ_OUTPUT_HIGH,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_B,
                                  EPWM_AQ_OUTPUT_LOW,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);


    //
    // === Action Qualifier SubModule - PH1, SEC === //
    //
    // EPWMA high on CTR = 0
    // EPWMA low on CTR = CMPA, in up count
    // EPWMA low on CTR = PRD
    //
    // EPWMB high on CTR = 0
    // EPWMB low on CTR = PRD
    // EPWMB high on CTR = CMPB, in down count
    //
    EPWM_setActionQualifierAction(LLC_SEC_PWM_BASE, EPWM_AQ_OUTPUT_A,
                                  EPWM_AQ_OUTPUT_HIGH,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    EPWM_setActionQualifierAction(LLC_SEC_PWM_BASE, EPWM_AQ_OUTPUT_A,
                                  EPWM_AQ_OUTPUT_LOW,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
    EPWM_setActionQualifierAction(LLC_SEC_PWM_BASE, EPWM_AQ_OUTPUT_A,
                                  EPWM_AQ_OUTPUT_LOW,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(LLC_SEC_PWM_BASE, EPWM_AQ_OUTPUT_B,
                                  EPWM_AQ_OUTPUT_HIGH,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    EPWM_setActionQualifierAction(LLC_SEC_PWM_BASE, EPWM_AQ_OUTPUT_B,
                                  EPWM_AQ_OUTPUT_LOW,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(LLC_SEC_PWM_BASE, EPWM_AQ_OUTPUT_B,
                                  EPWM_AQ_OUTPUT_HIGH,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);
}

2、关于EPWM1和EPWM2的驱动波形不是很理解，比如初级侧的驱动设置代码，能给个大概的驱动波形吗？特别是CTR值的变化和波形的关系。

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//
    // === Action Qualifier SubModule - PH1, PRI === //
    //
    // EPWMA low on CTR = 0
    // EPWMA high on CTR = CMPA, in up-count mode
    // EPWMA low on CTR = PRD
    //
    // EPWMB AQ output is inverted by DB for RED on EPWMB output
    // EPWMB high on CTR = 0
    // EPWMB high on CTR = PRD
    // EPWMB low on CTR = CMPB, in down-count mode
    //
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_A,
                                  EPWM_AQ_OUTPUT_LOW,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_A,
                                  EPWM_AQ_OUTPUT_HIGH,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_A,
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//
    // === Action Qualifier SubModule - PH1, PRI === //
    //
    // EPWMA low on CTR = 0
    // EPWMA high on CTR = CMPA, in up-count mode
    // EPWMA low on CTR = PRD
    //
    // EPWMB AQ output is inverted by DB for RED on EPWMB output
    // EPWMB high on CTR = 0
    // EPWMB high on CTR = PRD
    // EPWMB low on CTR = CMPB, in down-count mode
    //
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_A,
                                  EPWM_AQ_OUTPUT_LOW,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_A,
                                  EPWM_AQ_OUTPUT_HIGH,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_A,
                                  EPWM_AQ_OUTPUT_LOW,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_B,
                                  EPWM_AQ_OUTPUT_HIGH,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_B,
                                  EPWM_AQ_OUTPUT_HIGH,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    
    EPWM_setActionQualifierAction(LLC_PRI_PWM_BASE, EPWM_AQ_OUTPUT_B,
                                  EPWM_AQ_OUTPUT_LOW,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);

29 天前

0 ? ? 29 天前

Prodigy 60 points

另外关于板级保护函数中的关于比较器的正极输入源配置也有些困惑，根据函数void LLC_HAL_setupBoardProtection()的配置源，如以下几行代码所示：

ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_1, 0x2);//A6
ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_1, 0x0);//B6
ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_4, 0x3);//B8

按理说对应的ADC通道应该是ADC_CH_ADCIN6，ADC_CH_ADCIN6，ADC_CH_ADCIN8，但是在函数void LLC_HAL_setupADC()中的如下代码中：

//
// SOC configuration, sample all values on EPWM SOCA
//

ADC_setupSOC(LLC_ADCCTLBASE_ISEC, LLC_ADCSOC_ISEC, ADC_TRIGGER_EPWM2_SOCA,
LLC_ADCIN_ISEC, 8);

ADC_setupSOC(LLC_ADCCTLBASE_IPRIRESO,
LLC_ADCSOC_IPRIRESO, ADC_TRIGGER_EPWM2_SOCA,
LLC_ADCIN_IPRIRESO, 8);

ADC_setupSOC(LLC_ADCCTLBASE_VSEC, LLC_ADCSOC_VSEC, ADC_TRIGGER_EPWM2_SOCA,
LLC_ADCIN_VSEC, 8);

用到的ADC通道定义如下：

#define LLC_ADCIN_ISEC ADC_CH_ADCIN5
#define LLC_ADCIN_IPRIRESO ADC_CH_ADCIN9
#define LLC_ADCIN_VSEC ADC_CH_ADCIN10

这几个宏定义的通道是5，9，10，和需要的6， 6，8对应不上，这个地方是我理解错误吗？

我看了基于004x系列的LLC程序，ADC通道配置是正确的。

我在数据手册上找到了程序中要用到的比较器正端输入，如下图所示：

0 Daniel 27 天前回复 ? ?

TI__Mastermind 19835 points

您好

您的问题正在为您处理中，请耐心等待。

0 ? ? 27 天前

Prodigy 60 points

好的，谢谢！

0 ? ? 26 天前

Prodigy 60 points

尊敬的TI各位专家你们好！

还有几个问题要请教下：

基于F28003x系列的LLC程序，LLC的功率级传递函数推导方式是什么？有使用Extended Describing Function吗？数字补偿器2P2Z的系数计算使用MATLAB还是用SFRA+compensation designer得到的？我有办法来验证这些系数的计算结果吗？谢谢了！

0 ? ? 23 天前回复 Daniel

Prodigy 60 points

你好！请问下我的问题有结果了没有？谢谢！

0 Daniel 23 天前回复 ? ?

TI__Mastermind 19835 points

您好

正在为您处理中，需要时间复现验证，尽快给您回复，请耐心等待。

0 ? ? 23 天前回复 Daniel

Prodigy 60 points

好的，谢谢了！

0 ? ? 15 天前回复 ? ?

Prodigy 60 points

专家您好！

我们正在使用你们的TMS320F280034SPM做数字电源开发（PFC+LLC），希望能尽快得到相关技术支持回复，谢谢了！

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TMS320F280039C: TIDA-010062参考设计LLC的EPWM配置疑问