measuring floating inductor current in a truesine inverter application

Jan 22, 2008 0 Replies

Hi,



I am trying to make a true sine inverter outputting 120VAC 60Hz, and am using 200kHz for the fet switch. Also using software PWM control with either of one or the other of these two algorithms:



method1: (uses high speed DAC)



if inductor current > voltage error, pulse off



if inductor current > current_limit, pulse off



if time > limit pulse off (limit is our max dutycycle for this PWM period)


method2: (uses high speed ADC)



if inductor current > current_limit, pulse off



Duty cycle = ((desired voltage - current voltage) * gain) - (Inductor current * gain2)


For the current sensing I was thinking of using a hall effect sensor, like the "S22P025S05" from Tamura,



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