Hi everyone,
This is my first post being that I just made an account yesterday. I like the forum and there's lots of intelligent electronics people here, so I figured I would ask my questions here.
When inverters get overloaded, which parts burn up?
I have a couple 150w 12v inverters made by Monster Cable that were overloaded, but they still sort of work. The overload alarms on both are screaming when you turn them on. I got these from one of my brothers. He used them with a 13" TV with built-in VCR. He said the inverters would make noise when he first turned the TV on, but after that they were OK. Probably they got hot after extended use and the MOSFET's on them got weak. I don't know. I made schematics for them awhile back if anyone wants them. Not sure if it would help anyone because two of the chips have the numbers sanded off of them.
I also have two Conext CNB750's that I got from my Dad that his boss used with his G5 Mac and they both got overloaded coming out of standby. I found broken parts on one of them, swapped it and it still doesn't quite work. There was a shorted MOSFET that I'm not sure what it's purpose was. I've got pictures of the part that is toast. There were also some traces that were burned through in spots. I can turn them on with the AC unplugged and they run on the inverter for like a second or so and then it shuts off and the lights on the front flash. Probably because the microcontroller detects a fault.
Oh yeah, the MOSFET's that are in these UPS's are made by International Rectifier, but they said they were made specifically for Conext and they couldn't give me the specs or sell me replacements.
I have some APC schematics that are in Russian if anyone is interested. They cover some of the Smart-UPS and the Back-UPS models. I'm having some success translating with Google and Babelfish.
Anyway, sorry for the somewhat long post, and thanks for reading.
Andrew
This is my first post being that I just made an account yesterday. I like the forum and there's lots of intelligent electronics people here, so I figured I would ask my questions here.
When inverters get overloaded, which parts burn up?
I have a couple 150w 12v inverters made by Monster Cable that were overloaded, but they still sort of work. The overload alarms on both are screaming when you turn them on. I got these from one of my brothers. He used them with a 13" TV with built-in VCR. He said the inverters would make noise when he first turned the TV on, but after that they were OK. Probably they got hot after extended use and the MOSFET's on them got weak. I don't know. I made schematics for them awhile back if anyone wants them. Not sure if it would help anyone because two of the chips have the numbers sanded off of them.
I also have two Conext CNB750's that I got from my Dad that his boss used with his G5 Mac and they both got overloaded coming out of standby. I found broken parts on one of them, swapped it and it still doesn't quite work. There was a shorted MOSFET that I'm not sure what it's purpose was. I've got pictures of the part that is toast. There were also some traces that were burned through in spots. I can turn them on with the AC unplugged and they run on the inverter for like a second or so and then it shuts off and the lights on the front flash. Probably because the microcontroller detects a fault.
Oh yeah, the MOSFET's that are in these UPS's are made by International Rectifier, but they said they were made specifically for Conext and they couldn't give me the specs or sell me replacements.
I have some APC schematics that are in Russian if anyone is interested. They cover some of the Smart-UPS and the Back-UPS models. I'm having some success translating with Google and Babelfish.
Anyway, sorry for the somewhat long post, and thanks for reading.
Andrew
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