Indirect control of high frequency power converters for AC generation

It is shown how a very simple procedure of time reversal can solve, in a much easier way than other techniques, an important problem arising in some control strategies of two conventional DC-to-DC switched power converters used to generate an alternate voltage signal: the boost and buck-boost circuits. This problem is related to the non-minimum phase nature of the capacitor voltage normally used as output in these devices, which compels to control indirectly this variable by controlling the inductor current. A stable model that generates an adequate reference for this signal is proposed, which can be used in-line or in batch mode. The procedure is illustrated by numerical simulations using a sliding mode controller proposed elsewhere