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Controlling Multiple Buck Converters With Independent Frequencies
Example 3-1. Configuration for Example in Figure 3-4
//=====================================================================
// (Note: code for only 3 modules shown) |
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// Initialization Time |
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//======================== |
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// EPWM Module 1 config |
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EPwm1Regs.TBPRD = 1200; | // Period = 1201 TBCLK counts |
EPwm1Regs.TBPHS = 0; | // Set Phase register to zero |
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; | // Asymmetrical mode |
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; | // Phase loading disabled |
EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW; |
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EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE; | |
EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; |
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EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; |
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EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero | |
EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero | |
EPwm1Regs.AQCTLA.bit.PRD = AQ_CLEAR; |
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EPwm1Regs.AQCTLA.bit.CAU = AQ_SET; |
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// EPWM Module 2 config |
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EPwm2Regs.TBPRD = 1400; | // Period = 1401 TBCLK counts |
EPwm2Regs.TBPHS = 0; | // Set Phase register to zero |
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; | // Asymmetrical mode |
EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE; | // Phase loading disabled |
EPwm2Regs.TBCTL.bit.PRDLD = TB_SHADOW; |
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EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE; | |
EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; |
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EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; |
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EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero | |
EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero | |
EPwm2Regs.AQCTLA.bit.PRD = AQ_CLEAR; |
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EPwm2Regs.AQCTLA.bit.CAU = AQ_SET; |
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// EPWM Module 3 config |
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EPwm3Regs.TBPRD = 800; | // Period = 801 TBCLK counts |
EPwm3Regs.TBPHS = 0; | // Set Phase register to zero |
EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; |
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EPwm3Regs.TBCTL.bit.PHSEN = TB_DISABLE; | // Phase loading disabled |
EPwm3Regs.TBCTL.bit.PRDLD = TB_SHADOW; |
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EPwm3Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE; EPwm3Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; EPwm3Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; EPwm3Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero EPwm3Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero EPwm3Regs.AQCTLA.bit.PRD = AQ_CLEAR; EPwm3Regs.AQCTLA.bit.CAU = AQ_SET;
//
//Run Time (Note: Example execution of one
EPwm1Regs.CMPA.half.CMPA = 700; | // adjust duty for output EPWM1A | |||
EPwm2Regs.CMPA.half.CMPA | = | 700; | // adjust duty for | output EPWM2A |
EPwm3Regs.CMPA.half.CMPA | = | 500; | // adjust duty for | output EPWM3A |
74 | Applications to Power Topologies |
