| Electronics > Projects, Designs, and Technical Stuff |
| Petrol Generator Mod - Inverter AC Output |
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| Johnny B Good:
--- Quote from: schmitt trigger on January 30, 2019, 04:03:56 pm ---I believe that the AliExpress product will work, if you can make sense of the following Chinglish gibberish: " First, after the correction of the inverter inverter power tube removed, and then look at the correction of a few transformers transformer, look at the transformer secondary circuit is connected in parallel or in series, and then add the transformer parameters, modified wave transformer secondary is parallel , In each transformer secondary plus 16 laps. The secondary of the modified transformer is a tandem type, plus 8 laps per transformer secondary. Then in the correction transformer which transformer 1 empty foot plus a small voltage parameter, the small voltage parameters using 0.6 copper wire, in the transformer inside around: 5 laps, the small voltage is linked AC: 16V position." Just be sure to fuse both the input and the output, and you'll be fine. --- End quote --- I landed up on a French Language page trying to make sense of the 'technical specification'. Typically, when it comes to tech specs, the language doesn't matter so much. However, after second visit, I managed to stumble upon the "Original English" description page, aka the Chinglish Description page as you've just quoted. Sheesh! I can't imagine what a nonsense a French translation of Chinglish would look like to a native Francophone! :-// That seems to be describing an ancient digital switching sinewave synthesis technique based on a bunch of tapped transformers which that inverter module is most definitely not. The eight powerfets on the heatsink suggests the use of a pair of class D amplifiers in bridged output mode with sample filter inductors designed to filter the 5 or 8KHz sample rate typically used in these 50/60Hz inverters. I'm surprised if the absence of any form of overload protection is actually true. The Chinglish description could be hiding any number of 'standard features' by simple omission. However, the description seems to be one made up by the manufacturer and appears to be total and utter bollix. Personally 69 dollars is at least 60 dollars too much to take a punt on it being any use. It might turn out to be perfectly fine but that's not something that can be discerned from its current description. JBG |
| WanaGo:
Ignore the chinglish description, the circuit is much the same as that above, and what is posted in the reference schematic in the EGS002 datasheet which I have linked in previous posts. The main difference is the one I have has an extra Toroid on the output which is used to help with EMI, so I am told by the engineer. For 1000W and 2000W models, there are 4 FET's. For 3000W there are 8 FET's, to simply move more power. On these models there is no actual protection circuitry other than the IFB pin which I have already mentioned, which is somewhat slow so would be for general current overload, and then there is temperature protection from a thermistor which is bonded into the heatsink, and then voltage feedback which is adjustable to modify the nominal output voltage too. Some other inverter designs I have seen which are more for Battery inversion to 220VAC, but still using the EGS002 drivers, do have over current, over/under voltage etc protection, however I have not yet found any published schematic on these circuits. |
| WanaGo:
Here is a vid I found on Youtube, sadly it's in Portuguese, but Youtube auto translate to English subtitles gives somewhat useful information I guess. |
| WanaGo:
Here is another one in Russian, but auto translate to English is also somewhat helpful |
| Johnny B Good:
--- Quote from: WanaGo on January 30, 2019, 09:37:34 pm ---Ignore the chinglish description, the circuit is much the same as that above, and what is posted in the reference schematic in the EGS002 datasheet which I have linked in previous posts. The main difference is the one I have has an extra Toroid on the output which is used to help with EMI, so I am told by the engineer. For 1000W and 2000W models, there are 4 FET's. For 3000W there are 8 FET's, to simply move more power. On these models there is no actual protection circuitry other than the IFB pin which I have already mentioned, which is somewhat slow so would be for general current overload, and then there is temperature protection from a thermistor which is bonded into the heatsink, and then voltage feedback which is adjustable to modify the nominal output voltage too. Some other inverter designs I have seen which are more for Battery inversion to 220VAC, but still using the EGS002 drivers, do have over current, over/under voltage etc protection, however I have not yet found any published schematic on these circuits. --- End quote --- I think you may be overthinking the overload protection aspect here. You have to remember that the 380v is not coming off a 100A battery supply but from the more limited capability of a 3 or 4 KVA genset. An overload is more likely to stall the engine before burning anything out. The slower speed of the built in overcurrent protection is there to deal with the edge case of sustained overload that's not quite sufficient to stall the engine or trip the genset's own breaker. These inverter modules are surprisingly robust. The more sophisticated inverter/engine management unit in that little Parkside PGI 1200-B2 is rated for a continuous 1KW output (or with my particular example, 980W - not a trimpot in sight so I'm waiting for Lidl to get some more back in stock so I can test and swap inverter modules if the next is set to a more reasonable 1020 to 1050W overload set point and return the donor machine for a refund). It has an overload capability of up to 1200W for 30 seconds duration (not the 5 seconds claimed in the user guide). If it's overloaded above the 1200W mark, it shuts down the inverter immediately as you'd expect. TBH, I was quite surprised at this half minute endurance against modest overload surges, especially after reading the 5 seconds overload spec given in the owner's manual. JBG |
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