1- Design a buck-boost converter with a source varying from 10 to 14 V. The output voltage is regulated at - 12 V. The load varies is 15 W. The output voltage ripple must be less than 1% for any operating condition. a) Determine the range of the duty ratio of the switch. b) Design the inductor and capacitor values used in your design. c) Confirm your solutions using a simulation software for every operating condition (you must show the input voltage, the duty ratio, the output voltage "including the ripple" and the inductor current "including the ripple").