Interleaved Boost PFC is common topology for power converters. If we sense the switch current in Interleaved Boost PFC, then we have to use Peak Current Mode Control, then why the industry is using Average current mode Control? Why they are not preferring to use Peak Mode Control?
Like in this, UCC28070 is Avg Current mode Controller.
I have gone through multiple industrial notes, they are sensing Switch Current and using Average Current mode Control.
Peak current mode control (PCMC) is a control method for power converters that regulates the peak inductor current to a fixed value. This control method is widely used in many power converter topologies, including boost converters and interleaved boost PFC converters. However, in interleaved boost PFC converters, PCMC is not commonly used with the switch current sensing method. Instead, interleaved boost PFC converters typically use voltage mode control (VMC) or average current mode control (ACMC) with current sensing.
There are a few reasons why PCMC with switch current sensing is not commonly used in interleaved boost PFC converters:
1. Complexity: Implementing PCMC with switch current sensing requires precise current sensing and high-speed control circuitry, which can add complexity and cost to the converter design.
2. Noise: Switching noise from the high-frequency switching of the converter can interfere with the accuracy of the current sensing circuitry, leading to potential errors in the control loop.
3. Stability: Interleaved boost PFC converters have two or more interleaved channels, which can lead to complex interactions between the channels and may make the control loop unstable when using PCMC with switch current sensing.
4. Performance trade-offs: While PCMC with switch current sensing can provide fast transient response and good load regulation, it may have limitations in terms of steady-state performance. For example, it may be difficult to achieve high power factor correction with this approach.
Overall, while PCMC with switch current sensing is a valid control method for power converters, the industry has found that VMC or ACMC with current sensing is a more practical and reliable solution for interleaved boost PFC converters. These control methods provide good performance and stability while minimizing complexity and cost.
Hope it helps!!
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