A Schottky diode carrying current of Square wave @ 20A PK-PK @ duty cycle of 60% and a frequency of 100kHz with a forward voltage drop (Vf) of 0.3V is used in a power converter. The reverse recovery current is given as 0.5A and the reverse recovery time is given as 100ns with the maximum reverse blocking voltage as 400V. The on-off switching loss is computed as: Select one:a. 0.5 Wb. None of the given choicesc. 2 Wd. 1 Watt
Question
A Schottky diode carrying current of Square wave @ 20A PK-PK @ duty cycle of 60% and a frequency of 100kHz with a forward voltage drop (Vf) of 0.3V is used in a power converter. The reverse recovery current is given as 0.5A and the reverse recovery time is given as 100ns with the maximum reverse blocking voltage as 400V. The on-off switching loss is computed as: Select one:a. 0.5 Wb. None of the given choicesc. 2 Wd. 1 Watt
Solution
The question is asking for the on-off switching loss of a Schottky diode in a power converter. Here are the steps to calculate it:
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First, we need to calculate the average current. The peak-to-peak current is 20A, and the duty cycle is 60%. So, the average current is 20A * 60% = 12A.
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Next, we calculate the power loss during the on state. This is given by the product of the forward voltage drop and the average current, which is 0.3V * 12A = 3.6W.
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Then, we calculate the power loss during the off state. This is given by the product of the reverse recovery current and the maximum reverse blocking voltage, which is 0.5A * 400V = 200W.
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The total power loss is the sum of the on state power loss and the off state power loss, which is 3.6W + 200W = 203.6W.
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However, the power loss is not constant. It occurs only during the switching period, which is given by the reverse recovery time. So, we need to multiply the total power loss by the switching frequency and the reverse recovery time to get the average power loss over time. This is 203.6W * 100kHz * 100ns = 2.036W.
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Finally, we round the result to the nearest whole number to get the final answer. So, the on-off switching loss is approximately 2W.
Therefore, the correct answer is c. 2 W.
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