Efficiency Enhancement #1

[areiter128]

100% On-Time Implementation

• Type: Low System Level
• Priority: High

Currently the PWMs are switching buck and boost legs on a cycle-by-cycle basis. As the 4-switch Buck/Boost architecture usually have either the buck-leg or boost-leg in a 100% ON condition, continuous switching results in increased losses.
The combinatorial logic of the PWM module allows selective operation of the half-bridge drives only briefly turning on the 100% half-bridge to recharge the bootstrap capacitor when needed.
Implementing this will also require to rework the PWM distribution to account for 100% on-time vs. limited PWM output.