Average-current-mode control of two-input buck postregulators used in power-factor correctors

The use of the average-current-mode control in the two-input buck postregulator is studied in this paper. Using this type of control, the attenuation of the input voltage ripple (100-120 Hz) increases in relation to the one obtained when a conventional voltage-mode control (with or without feedforward) is used and, therefore, lower bulk capacitors can be used to obtain a very low voltage ripple at the output, which is very important when a battery is connected at the output. This is very common in distributed power supply systems.