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State-space averaging and linearization are applied to the control law of current-injected, constant-frequency switching regulators, resulting in a bona fide two-loop system representation. As a theoretical goal, first-order behavior can be achieved with no right-half-plane zeroes. Actual performance may be limited by switching frequency interference considerations.
The phenomenon of open-loop instability between the powerline EMI filter and the switching-regulator power supply is investigated [1]. As a first step to the filter-design problem, simple modifications are made to the filter chosen from EMI considerations alone to assure stability as well.
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