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I had recently found a Chinese hardware used in switching Skkt-92, as a static switch, circuit and pic attached. This same circuit is available in the app note-page 106 also attached. The resistors R18. R19, R20, R21 and R22 are 2 watt i guess(guessing from size). I have also attached...

What else do u suggest (IGBT?), Mosfets are not an option as the current will increases to 250A and above in higher rated UPS. This is just a driver part of much larger machine. Thanks Regards Gokkul

Will try doing some research on voltage across thyristor method to detect triac off. So about the continuous gate on you mean it wont do much harm as i am using triac (as one thyristor will always be conduction). Just to simplify the code in this project :). Kind of switch it on and forget...

Been doing some and reserch and found a app note by nxp for detecting the triac off state by monitoring gate voltage level. Attached the app note for ref. Also wanted to know if i keep the gate continuously on, read some where on the internet that it would create some gate loss of some kind and...

Sorry i forgot to mention it is two thyristor (part no - SKKT-92) No not low current - 50A minimum, for higher current the switching device will be upgraded but not the driver. That is the plan :) Thanks Regards Gokkul

Dear Members I am currently designing a static switch driver circuit (for thyristor based switch) for 1phase and 3phase AC supply. The same circuit will work for 1phase if jumper is not set and will work for 3phase if jumper is set. The help i need is in switching off the thyristor. There are...

Now that the current leakage is taken care of, my next issue is failure modes :), mostly connecting the panel in reverse. Yes another point to consider :). Thanks for all your feedback. If possible please confirm my experiment with the panel that you have just to make sure that the leakage...

Yes as you said the current will remain constant and this power loss may play a small role in a MPPT charger efficiency but in pwm charger this can be negleted. But adding a 20 Amp diode will increase the system cost as it will need some heat sink as the power dissipated is approx 10 Watt. So...

I have uploaded a simple charger concept for reference. Here the battery and the solar panel negative is connected through a N-mosfet as a low side switch. This charger will monitor the battery state of charge and will cut the connection between the battery minus and solar minus by controlling...

Panels have Bypass diodes not Blocking diodes. Bypass diodes are to reduce the impact of shading on the panel. But the whole question here is what will be the current that will be drained by the panel at night, assuming that the charge controller does not have a blocking diode in series...

In a solar system during day power is obtained, but during night the same panel which acts as a power source act as load and will drain the battery. This is what most people say. And to avoid the power drain at night it is suggested to use a diode in series (Blocking Diode). Now if i have a 12...

Thanks for all your inputs. Right now i am planning to go with GPLv3 for all the software and and also for all the CAD files of the hardware. I am currently working on a design and will upload the files once they are good enough to manufacture. I don't want to include files that are in the...

I plan to go with GPLv3, free software :). Thanks Regards Gokkul

drawoh Thanks for the info, i see there is bit of a confusion going on in the community about Free Software and Open Source (just googled some right now :) ). My idea here is to create hardware products that can be manufactured in the same way free software are made. (I hope i am clear...

Dear All, I am currently planning to start a open source hardware project. I wold like to licence my project under GPLv3 and i have a few query in the GPLv3. This product i am planning is a solar charger 1) The hardware i am planning is open source (i will upload all the source and...

You read my mind :). My doubt exactly that if the battery voltage is too low then a inductor based system will be complex. I will look into the problem and try to design the system so that the battery voltage remains high enough for minimum boost of voltage. Thanks for the feedback...

Thanks for the guidance, but this option is my plan B. initially i wanted to get some info on the design from the forum if it did not work then plan B is reverse engineering :). Thanks Regards Gokkul

Dear All, I am currently working on a design of Grid Tie Inverter where the source of power is from a Lead acid battery. The inverter converts the DC to AC and will feed it the Grid. In low power range of less than 200W boost converter are used to step up the DC and then convert...

I know that, i just need someone to verify. Cos implementing the circuit will take some time and if it fails i will have to do the process again. So i am just trying to check if my calculations are correct. Thanks Regards Gokkul

Hello All For any one new joining this discussion here are the links to my previous questions. http://www.eng-tips.com/viewthread.cfm?qid=350101 http://www.eng-tips.com/viewthread.cfm?qid=350473 So that being said i am currently in the part of the design stage where i need to choose the...