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Switching power supply still don't workafter changing the MOSFET

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Switchers can be funky to troubleshoot. can you hear or detect if it is oscillatiing? Check primary w/ a dvm set on ac The primary side of the circuit (oscillator) is probably shot if you don't get any readings If you are check the 2ndary side. Could be anything. These types of power supplies are very efficient, very stable but a pain to trouble shoot. Atny component in the oscillator circuit can shut it down cold. Good luck. Gary

Posted on Mar 14, 2009

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Ben, Power Inverters of different make and style use different fuses, I will post links for you to check out.
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How to get a control circuit schematic for a xantrex Duracell 3000 Watt power inverter

First off you will most likely never find a schematic for any inverter. I have never seen one an they are closely guarded by the factory. Even dealers dont get them. If you study electronics a little you can service one of these things easily. It is really a switching supply. Once opened a compentent service man can repair one. All you really need is a good multimeter an knowledge.

Jan 20, 2015 | Inverter Electronics - Others

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Is there a device that I can connect to my inverter to keep it from shutting down due to voltage spikes from the vehicle?

Short of shutting the inverter off momentarily, there is not a simple answer. because you could slightly modify the inverter's over voltage reference IC, but that requires knowledge of the inverter that the manufacturer does not want you to know normally.

if you are running the inverter off a second battery, you could isolate that second battery from the system through any number of time delay relays, time delay circuits comparable to intermittent wiper circuits.

However, if you are capable with a soldering iron, MOSFETs can be utilized as a voltage variable resistor. They can be in a parallel array to increase current. You need to know what current draw is by the inverter with the normal load.

Once you know that current, you can select a MOSFET of sufficient "Constant Current" or pair of them and wire them as "Voltage variable resistor."

The circuit actually does work, the resistor is adjusted until you aproach the "pinch off zone" and tweak it to the point you want to operate with. The MOSFETs will need to be on a heat sink, any you can even wire a switch across them to short across them to remove them from the circuit. The image only shows one MOSFET, but they can be operated in parallel for more current capactiy. Which why the constant current rating of the MOSFET needs to be known. The type of MOSFET is not critical, it can be a trench fet, hexfet, etc. You should plan for double the current draw in your MOSFET selection for purposes of a design centered value. You can use up to about 5 MOSFETs from that one pot. For extra margin in the design you could add 0.1 ohm (2 Watt) resistor in series with each MOSFET to balance current through the MOSFETS, although MOSFETS will self equalize to a point. When they heat up their internal resistance goes up so thermal runaway is not normally an issue.


Jan 18, 2012 | Electronics - Others

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What is full meaning of the following codes in design and constructing an inverter-NE55,CD4013,JRC455,A733,IRFP150,1N4007,C945.

These numbers are the identification of some electronic devices that probably are being used in the inverter's circuit:

CD4013 - Dual D Flip-Flop integrated circuit
1N4007 - 1 A rectifier diode
IRFP150 - power MOSFET
A733 (2SA722) - PNP silicon transistor (low frequency amplifier)
C945 (2SC945) - NPN silicon transistor (low speed switching)

I could not find the devices marked JRC455 and NE55 - maybe they were not correctly marked, but there are some devices which have similar designations: JRC4559 is a dual operational amplifier integrated circuit and the NE555 is a time/oscillator integrated circuit.

You can download their datasheets from

Hope this information can be useful!

Mar 09, 2011 | Electronics - Others

3 Answers

I'm dumb. Can I hook an inverater to my generator and produce more enegry than my generator produces???

Please understand that the generator produces power from fuel with an engine wheras the invertor is one which genrerates power from a stored battery using the principle of frequency switching a DC source to induct and produce AC.
Now you can have an uninterupted power supply setting with the invertor backed up by the generator so that when the battery voltage goes down you can start and charge the invertor and also supply the extra energy .
the ratings of both must also be considered.

Sep 25, 2010 | Electronics - Others

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Inverter not switching on

trivedi ji namaskar
please make sure your inverter is on auto mode and then contect immidetly to your service provider for maintenance inverter becuse its microcontroller systems is not working.
hope question,s answer
thank you.

Jul 09, 2010 | Inverter Pure Sine Wave 1500w Inverter

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I have a problem with my dell studio 1535 lcd.i guess the problem is with the t check whether the inverter is working by using an ammeter

1 check if the battery is still good by switching the meter to DC and test it if it is still reading the correct voltage.if not the batteries may be bad
2. switch it to AC and check the out put if it is supplying a voltage output.if not the transistors may be bad

Mar 04, 2010 | Dell Studio 15, Studio 17 175-Watt Power...

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I have a ct312 inverter tig welder and the abnormal pilot light has come on and ive been through what it says in the maintenance book but has not fixed it. the book says there must be something wrong with...

i can't tell you what's wrong with your machine but i can tell you that a MOSFET is a 'metal oxide semi conductor field effect transistor'. So, it's a transistor, probably a biggish one that handles the power of your cutter/welder and maybe possible to replace without soldering.
i have heard that a lot of these chinese machines suffer from loose connections so it may even be a loose connection to a component rather than a faulty component.
by the way, is it any good when it's working? i am interested in buying one for myself.

good luck.

Feb 09, 2010 | Electronics - Others

1 Answer

240 volt supply to inverter is ok but have not got any output from inverter to motor at output terminations


Nov 25, 2009 | Electric Fuji Fvre7s Compact Inverter

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