Here is an inverter I'm working on. The output MOSFET's are toast. I was surprised to find that a fairly high-end inverter is 100% F-you caps 
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Re: Inside a power inverter... Fuhjyyu's??
Wow 24 power devices, mostly MOSFET I guess. 8 empty pads?
What is the output power? Is it sine wave or modified square wave output?
The F caps seem to have considerable market penetration with manufacturers.Gigabyte EP45-DS3L Ultra Reliable (Power saver)
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Re: Inside a power inverter... Fuhjyyu's??
the 8 empty spots are for the big output MOSFET's that I removed cause they were toast. It is a 2500W inverter. Kinda neat how it works. I think the occillator runs at 160Khz for the primary side. I believe it is modified sine wave output.Comment
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Re: Inside a power inverter... Fuhjyyu's??
The waveform is modified sinewave output.
16 MOSFETs next to the transformers are used on the primary (battery) side, while the 8 MOSFETs next to the large inductors and 200V capacitors are used on the secondary (mains) side.
Depending on the model, some components are not fitted.
I found an inverter (with a similar topology to the pictures - high frequency switchmode transformer supply with MOSFETs at the high voltage DC supply to convert it to AC) which had no fuse protection on the LV winding on the secondary side
- I had a close call when I accidentally shorted the rectifiers on it (The winding started to glow - fortunately, I disconnected it quickly enough!)
For 500W+ inverters, I only recommend using 24V units.My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.Comment
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Re: Inside a power inverter... Fuhjyyu's??
Seems like there would be two occilators in this inverter then- One at 160Khz for the input side to give 2x 60v rails, and a 60Hz occilator to drive the output mosfets that give the current gain for the ac output. Quite a different setup than a conventional step-up transformer inverter with one occilator.
EDIT: err no, that would give it a square wave output, wouldn't it? It seems to have 4 phases on the input of each rail.
Wish I knew why it blew the outputs up, the owner did not overload it as far as I know. The output mosfets cost about $7 each, so they are looking at at least $50 worth of parts, assuming nothing else is bad. I'm concerned about the driver transistors (the TO-92 devices near the secondary side).
Looks almost like a car audio amp, with the way the case is designed...Last edited by Maxxarcade; 04-24-2007, 07:53 PM.Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi all!
I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅
I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
https://www.badcaps.net/forum/troubl...-hardware-devi... -
Hi all,
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This specification for the HP Pavilion Power Pavilion Power 15-cb009nl Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Pavilion Power 15-cb009nl boardview and Pavilion Power 15-cb009nl schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that...09-06-2024, 05:59 AM
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