I am working on a full bridge boost converter capable of putting 900 watts into a load. This is based upon TL494 pwm generator from Texas instruments. TL494 is made to work in complementary output logic.
But there is a little problem with the mosfet deriving stage. I am using the standard circuit given in the datasheet of IRS2110 mosfet driver.
Mosfet used are IRF540N.
Converter lasts only for just a second😕. I have checked the output of TL494 on oscilloscope its is working fine at 50khz frequency. I have doubt on mosfet driving circuit. Please suggest me possible areas of fault.
But there is a little problem with the mosfet deriving stage. I am using the standard circuit given in the datasheet of IRS2110 mosfet driver.
Mosfet used are IRF540N.
Converter lasts only for just a second😕. I have checked the output of TL494 on oscilloscope its is working fine at 50khz frequency. I have doubt on mosfet driving circuit. Please suggest me possible areas of fault.
Max power is 600 watts now. I have made half bridge boost converter.
It works fine without rectifying diodes. if diodes are connected then no load current goes high up to 2.5A at duty cycle above 80%. Mosfet are just warming a little.
Dead time provided by TL494 is at default value and is approximated as 7-8%.
What can be the problem? Suggest me the area of improvements in design of snubber circuit and gate driving circuit.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
It works fine without rectifying diodes. if diodes are connected then no load current goes high up to 2.5A at duty cycle above 80%. Mosfet are just warming a little.
Dead time provided by TL494 is at default value and is approximated as 7-8%.
What can be the problem? Suggest me the area of improvements in design of snubber circuit and gate driving circuit.
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