Abstract
This paper describes how current mode control provides active damping for boost converters with constant power loads. Small-signal control-to-output transfer functions are derived for peak or valley current mode controlled boost converter with a downstream regulated converter modeled as constant power load. Furthermore, it is shown how load current feedforward presents an effective way to improve power load transient responses. Modeling and design approaches are validated by test circuit simulations, demonstrating stable operations using current mode control under constant power loads, and improved power step load transient responses based on load current feedforward.
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