Hi,
I am currently designing a dc/dc boost converter to get the output of a solar panel (output is 17.7V) up to 100V.
to get the duty ratio i have done the calculation:
k= 1 - Vs/Vo = 1 - (17.7/100) = 0.823
I want to use an igbt for the switch, and i am getting confused about the timing calculations....
I want the igbt to switch at 20kHz so i have done the calculation:
Tp = 1/f = 50us
On the datasheet of the igbt it states the following typical values:
turn on delay time - 25ns
rise time - 17ns
turn off delay time - 215ns
fall time - 13.2ns
This totals 270.2ns which i will need to add to the Ton time to work out the total time it takes to completely turn on and off the switch.
This is the part where i am getting confused....what sets how long the switch is on for? i.e. Ton
Is the calculation below correct?
using Ton = K.Tp
Ton + 270.2ns = 0.823 x 50us
Ton = 40.88us
Basically i need to know if this is correct as these values are used to calculate the L and C values in the converter.
Any help on this would be greatly appreciated.
Thanks in advance.
I am currently designing a dc/dc boost converter to get the output of a solar panel (output is 17.7V) up to 100V.
to get the duty ratio i have done the calculation:
k= 1 - Vs/Vo = 1 - (17.7/100) = 0.823
I want to use an igbt for the switch, and i am getting confused about the timing calculations....
I want the igbt to switch at 20kHz so i have done the calculation:
Tp = 1/f = 50us
On the datasheet of the igbt it states the following typical values:
turn on delay time - 25ns
rise time - 17ns
turn off delay time - 215ns
fall time - 13.2ns
This totals 270.2ns which i will need to add to the Ton time to work out the total time it takes to completely turn on and off the switch.
This is the part where i am getting confused....what sets how long the switch is on for? i.e. Ton
Is the calculation below correct?
using Ton = K.Tp
Ton + 270.2ns = 0.823 x 50us
Ton = 40.88us
Basically i need to know if this is correct as these values are used to calculate the L and C values in the converter.
Any help on this would be greatly appreciated.
Thanks in advance.