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As shown in the following circuit: Each MOSFET has an internal MOSFET diode connected across their drain-source pins. The anode of the MOSFET diode is connected to the source, while the cathode pin is connected to the source pin of the device.

Because the MOSFETs are configured in a bridge network, the MOSFET diode are also configured in a basic full-bridge rectifier network format. With a few relays, fast switching is achieved to enable grid AC to charge the off grid solar batteries through the MOSFET diode.



In fact, the MOSFET diode with this bridge rectifier network structure, and the process of using a single transformer as the inverter transformer and charger transformer are relatively simple.
As shown in the figure, if START is positive, the orange arrow indicates the current mode in which the current passes through D1, battery, D3 and flows back to FINISH or the negative terminal of the transformer. On the next AC cycle, the polarity is reversed and the current flows as indicated by the blue arrow through body MOSFET diode D4, battery D2 and back to the FINISH or negative terminal of the transformer winding.

This repeats continuously, converting both AC cycles to DC and charging the battery, such as 12v battery. Because MOSFET diode is included in the system, extreme care must be taken when handling them to ensure that these devices are not damaged during the process.

I added a Triac/Microcontroller circuit to the High voltage side to control the charging current .
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Hi,
I do appreciate your comment and feel free to give away your thoughts .
Traditionally Modified sinewave inverters charging system use this method (see pic). Except that they turn off the inverter before apply the  controlled Triac charging system . The picture attached is for a half bridge system with transfer circuit option . Old TRACE ( now Xantrex) inverters do it thsi way too.
There is a relay for charging system , so when the inverter section is turn off because the Public grid is present , this relay feed the triac section and if you notice is on a "charger tap"  which elevates the voltage at the low voltage side of the transformer . The Power mosfet protction Diodes serve as rectifiers (which usually are same Amp rating as the mosfet rating itself) .
I found the answers for this post already and both were yes . The only doubt will be clear out on real test .
I already wrote the firmware and Test it in a simulation enviorement.
At this moment I'm routing the new controller PCB in order to make them fabricated.
I built several "OzInverter " but never as Transfer and charger unit which is my goal.

Any aditional input is apreciated
Thanks
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I have to admit i cant wrap my head around what you are trying to accomplish. Maybe a block diagram sketch of power flow on a napkin snap photo an upload. It may make perfect sense then. If you are wanting to energize your large toroid with utility mains power while your fets stay asleep connected to it. I dont think thats a great idea. Seems doable but its a very short distance to a boom.

LH
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« Last post by Sasaka-4628 on May 23, 2024, 12:50:09 pm »
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Hello,
Always reading these informations.
For the Feedback transformer I have got a lot of 0.5 VA small transformers 220vac/14vac . I only have One inverter in use and is not touched in years .
My question would these 0.5VA would work for the feedback transformer ?
I'm working on a transfer & charging profile for these "Oztules" inverters and I would like to use these transformers since they are  in hands and would fit in PCB  with a small footprint.
For charging purposes I'm using a transformer tap controlled by triac at high voltage side of the transformer . This tap  will increase the voltage at low voltage side of the transformer .

I'm Asumming That if I Control SD with microcontroller to shut down the inverter before apply the triac 's tap. Since it is a full bridge I may use  the mosfet body  diode as rectifiers .

Any Input is appreciated.
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Hello,

I'm developing a Firmware in order to control a Triac at high votage side of the transformer with a charging tap .
In my case is  a 90vac tap  Relay switched when Mains are present. Transformer high voltage side is (Neutral,90vac and 120vac). In tention is use Body Diode of Mosfets as full wave rectifier.
Control board will follow votage 3 stage profile depending on voltage selected ( of course battery and transformer must match)
Before switch to "charging" state when mains are present , I'm asured that Inverter is powered down ( using SD) .
Questions :
1-There is a 20k resistor across Gate/source on OzInverter ... When shut down this resistor would be held the mosfet at the ground potential ?
2-The feedback Transformer which connected VFB , May use a 0.5 VA 14vac ?  I want to incorporate a smallest transformer there .

Any comment/suggestion would be highly Apreciated

SandraMar
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Weather / Re: Been about a year
« Last post by bj on February 11, 2024, 05:03:39 am »
   We did finally get a bit of snow, (about 2 inches).
As we type away, supposed to be above freezing the next couple of days, then back to more seasonal.
   Longer range, they are expecting dry.  Province is expanding firefighting capabilities.  Last year was a record
for acres of forest burned.  (some fires still burning).
   In general, this area used to have all planting of crops done by May 24th long weekend.  Now the ones that
are planting 2 to 3 weeks earlier are doing much better.   My land renter did so, and got 150 bushel per acre of oats.
   All we can do is try to adapt.
bj
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Weather / Re: Been about a year
« Last post by Wolvenar on February 10, 2024, 07:50:17 pm »
We are still warm here and basically no snow. I just put a water pump in the truck Jan 30th in a tee shirt in the driveway at +53F. Normally about then we are in a cold snap and will not have seen above 0F sometimes not above -20F for weeks, and would not for weeks more. It's still in the +40f range. We are quickly exiting the time period we could see negative temps this year. I'm a bit worried that without the normal weeks of melting and warm up we will see temps from August by June.
Not wanting to guess where August might bring us. But this is not anything this area has not seen, we have had this but its been a few generations.
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