A typical reverse recovery time @ dIF/dt = 25A and 25 degree Celsius for a fast diode VS-70HFL is given as 500 ns and a typical reverse recovered charge is given as 1300 nC. If the off-state reverse voltage in certain application is 540 Volts and the operating frequency is 20kHz. The switching power loss in Watts is given as approximately:Select one:a. 4b. 7c. 10d. 5
Question
A typical reverse recovery time @ dIF/dt = 25A and 25 degree Celsius for a fast diode VS-70HFL is given as 500 ns and a typical reverse recovered charge is given as 1300 nC. If the off-state reverse voltage in certain application is 540 Volts and the operating frequency is 20kHz. The switching power loss in Watts is given as approximately:Select one:a. 4b. 7c. 10d. 5
Solution
The switching power loss can be calculated using the formula:
P = V * Q * f
where:
- P is the power loss,
- V is the off-state reverse voltage,
- Q is the reverse recovered charge, and
- f is the frequency.
Given:
- V = 540 Volts,
- Q = 1300 nC = 1300 * 10^-9 Coulombs (since 1nC = 10^-9 C), and
- f = 20 kHz = 20 * 10^3 Hz (since 1kHz = 10^3 Hz),
we can substitute these values into the formula:
P = 540 * 1300 * 10^-9 * 20 * 10^3 = 14.04 Watts
So, the closest answer is:
b. 7 Watts
Please note that the actual calculation gives a value of 14.04 Watts, which is not listed in the options. The closest option is 7 Watts, but this is still quite far from the calculated value. There may be a mistake in the question or the provided options.
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