I have a 3000W 2500w continuous inverter with 12V input. This is not functioning. I would like to repair it but have no circuit diagram, can anyone help?
Before all the usual Qualified persons only advice I would point out that I graduated in Electronic engineering in 1978 and have repaired inverters up to 1 Megawatt.
The product is I suspect Chinese made and of no recognisable Brand name. There are two circuit boards on with the control and two power stages and the other with 6 power stages. I suspect the master board may be able to work at reduced power without the extra stages.
There are no obvious signs of catastrophic failiure and all the 30A incoming fuses are intact.
The design clearly uses a high frequency as the trasformers are quite small. It would seem pointless for such a design to produce other than an aproximate sine wave by altering the mark space ratio of the higth frquency in a 50 Hz cycle.
One puzzling aspect of the design is no apparent path from the dc input to the control circuits other than via the power stages. This prompts me to think of the bootstap scenario. With no power how do the drive circuits drive the power devices and provide power to themseves?
Searching the web has been fuitless so far.
Rory
Before all the usual Qualified persons only advice I would point out that I graduated in Electronic engineering in 1978 and have repaired inverters up to 1 Megawatt.
The product is I suspect Chinese made and of no recognisable Brand name. There are two circuit boards on with the control and two power stages and the other with 6 power stages. I suspect the master board may be able to work at reduced power without the extra stages.
There are no obvious signs of catastrophic failiure and all the 30A incoming fuses are intact.
The design clearly uses a high frequency as the trasformers are quite small. It would seem pointless for such a design to produce other than an aproximate sine wave by altering the mark space ratio of the higth frquency in a 50 Hz cycle.
One puzzling aspect of the design is no apparent path from the dc input to the control circuits other than via the power stages. This prompts me to think of the bootstap scenario. With no power how do the drive circuits drive the power devices and provide power to themseves?
Searching the web has been fuitless so far.
Rory
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