Answer :
Final answer:
In a buck-boost converter operating in continuous-conduction mode, increasing the duty-ratio above 0.5 does indeed increase the output voltage to the input voltage ratio. The duty-ratio refers to the time the switch is active in a given period.
Explanation:
In the case of a buck-boost converter operating in continuous-conduction mode, the verity of the statement in the question is true. The duty-ratio, also known as duty cycle, is the proportion of the period in which a signal is active.
In this context, it refers to the amount of time the switch is in the 'on' position compared to the total period. The converter inefficiently transfers energy when the duty ratio is 0.5.
As the duty ratio increases above 0.5, the output voltage tends to be higher than the input voltage. Thus, increasing the duty-ratio above a value of 0.5 does indeed increase the output voltage to the input voltage ratio in a buck-boost converter.
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