Tool/software:
Hello TI Experts,
I’m exploring the PWM Chopper Submodule in the C2000 ePWM module and want to understand its real-world applications beyond theoretical use.
1. Where is this feature actively used?
- Is it primarily designed for pulse transformer-based gate drives?
- Are there any practical applications in motor control (BLDC, PMSM), resonant converters, or other power electronics systems?
2. Frequency Considerations
- Why is the chopper frequency typically in the MHz range, even though the PWM output itself can reach up to 50 MHz?
3. Chopper Pulse Behavior
- What is the purpose of allowing a different width for the first pulse, while keeping subsequent pulses different?
- Does this "first pulse setting" apply to:
- The very first pulse of the entire PWM signal (PWMxA & PWMxB both fixed), or
- The first pulse of PWMxA and the first pulse of PWMxB separately?
4. How Does This Work with a Pulse Transformer?
- Normally, pulse transformers require alternating HS and LS switching to avoid core saturation.
- However, in this case, only the HS is switched with high-frequency chopping before LS takes over.
- How does the transformer core reset properly in this situation?
- Wouldn’t the core still saturate if the chopper frequency isn’t high enough?
- Are there any specific design guidelines or calculations TI recommends to ensure proper operation?
5. Reference Designs & Practical Use
- Are there any TI reference designs, application notes, or waveform examples that show real-world implementations of this feature?
I’d appreciate any insights or links to relevant resources.
Thanks in advance!
Best Regards,
Abhiraj
