The right leg of the bridge works fine and keeps a nice 50% duty cycle, but the other leg shows the following features:įigure 1: Vds of the TOP MOSFET of the failing legįigure 2: Vds of the BOTTOM MOSFET of the failing leg Yet, when I increase my input voltage to a certain value (a bit less than 300 V), one leg of my bridge fails. The system works fine and I was able to transmit about 700 W during 30 minutes without any problems. ( edit: with a dead time of 50 ns, so not exactly 50% duty cycle). The microcontroller generates four PWM signals of constant 50% duty cycle. The bridge is driven by two IR2110 drivers which are connected to a dspic30F1010 microcontroller. For this purpose, I designed a full bridge inverter which is connected to an autotransformer whose output is rectified (this way I can gradually increase my DC input voltage). For my master thesis, I am designing a wireless power transfer using magnetic resonance.
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