Hi all ! I am working on a GTI project for my thesis . I have successfully stepped up low voltage 12VDC to 350 VDC .
The hard part is AC connection side . I used two mosfet drivers named Ir2101 control by opto-isolated signals from PIC16f886 (I don't draw them in the schematic). These two mosfet-driver is uesd to control a H-bridge in phase with the grid . I can create 240V AC from this H-bridge already .
I try to test this H-bridge to see if it can withstand grid-voltage(220V AC) for some time(a cycle) for my zero-cross detection circuit to work and transmit zero-cross point timing to my PIC . I have carefully connectd a 100W light-bulb in series with one of grid line (so if anything goes wrong , there will no short-circuit explosion ) before doing this test.
My problem is when I connected AC main into H-bridge output , the 100W light bulb lighted up which indicated a possible short-circuit .
Can anyone give me some pratical tips on how to succesfully connect to grid if you already have 350 VDC ,a working H-bridge and a working zero-crossing circuit(I take this zero-crossing circuit form Microchip Grid-tie inverter application note) ?
P/S : Vcc in this schematic is 12V . C5 and C6 is capacitors 104 (630V ) .
The hard part is AC connection side . I used two mosfet drivers named Ir2101 control by opto-isolated signals from PIC16f886 (I don't draw them in the schematic). These two mosfet-driver is uesd to control a H-bridge in phase with the grid . I can create 240V AC from this H-bridge already .
I try to test this H-bridge to see if it can withstand grid-voltage(220V AC) for some time(a cycle) for my zero-cross detection circuit to work and transmit zero-cross point timing to my PIC . I have carefully connectd a 100W light-bulb in series with one of grid line (so if anything goes wrong , there will no short-circuit explosion ) before doing this test.
My problem is when I connected AC main into H-bridge output , the 100W light bulb lighted up which indicated a possible short-circuit .
Can anyone give me some pratical tips on how to succesfully connect to grid if you already have 350 VDC ,a working H-bridge and a working zero-crossing circuit(I take this zero-crossing circuit form Microchip Grid-tie inverter application note) ?
P/S : Vcc in this schematic is 12V . C5 and C6 is capacitors 104 (630V ) .
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