measuring floating inductor current in a truesine inverter application
- From: Jamie Morken <jmorken@xxxxxxx>
- Date: Tue, 22 Jan 2008 16:26:29 GMT
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,
http://parts.digikey.com/1/parts/945709-sensor-current-25a-2-5v-pcb-s22p-s22p025s05.htmlwhich has
.
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