voltage drop in inverter dc bus

Amirtaha2541 · 1st January 2012, 01:32 PM

what whenever i attach a load to my inverter the dc bus voltage drops and in load=400watt input mosfets burns?
inverter is modified sinewave
dc bus voltage( no load)=333 volt & input voltage=13 volt
dc bus voltage( load=40 watt)=295 volt
dc bus voltage( load=145 watt)=277 volt
dc bus voltage( load=245 watt)=254 volt
dc bus voltage( load=345 watt)=223 volt
dc bus voltage( load=400 watt)=205 volt. in power 400 watt after a few seconds input mosfets burns

Th3 uN1Qu3 · 2nd January 2012, 12:44 AM

Without a schematic we can't tell you anything. You didn't even mention the model of your inverter. Anyway, the results you have posted are typical of a cheap chinese inverter with underspec'd dc-dc converter (especially capacitors and mosfets) and no regulation on the DC bus. It isn't worth the hassle to try and make the DC bus regulated, instead try and increase the DC bus capacitor as far as the space allows, and use better mosfets - IRF1404 are a good choice.

! · 2nd January 2012, 12:48 AM

This is an amplifier power supply, or this is the wrong forum?

1st January 2012, 01:32 PM	#1
Amirtaha2541 diyAudio Member Join Date: Dec 2010	voltage drop in inverter dc bus what whenever i attach a load to my inverter the dc bus voltage drops and in load=400watt input mosfets burns? inverter is modified sinewave dc bus voltage( no load)=333 volt & input voltage=13 volt dc bus voltage( load=40 watt)=295 volt dc bus voltage( load=145 watt)=277 volt dc bus voltage( load=245 watt)=254 volt dc bus voltage( load=345 watt)=223 volt dc bus voltage( load=400 watt)=205 volt. in power 400 watt after a few seconds input mosfets burns

2nd January 2012, 12:44 AM	#2
Th3 uN1Qu3 diyAudio Member Join Date: Feb 2010 Location: Bucharest	Without a schematic we can't tell you anything. You didn't even mention the model of your inverter. Anyway, the results you have posted are typical of a cheap chinese inverter with underspec'd dc-dc converter (especially capacitors and mosfets) and no regulation on the DC bus. It isn't worth the hassle to try and make the DC bus regulated, instead try and increase the DC bus capacitor as far as the space allows, and use better mosfets - IRF1404 are a good choice. __________________ "Audio grade" components simply means that they failed at a more critical job.

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2nd January 2012, 12:48 AM	#3
! diyAudio Member Join Date: Jun 2005 Location: Midwest	This is an amplifier power supply, or this is the wrong forum?

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