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#1
Start by
Anirban Joy
09-17-2013 08:31 PM

zero voltage switching

My recent project is a zero voltage switching pwm current controller for motor drives. Does anyone have experience in designing any such controller?
09-17-2013 11:03 PM
Top #2
Brian Farrell
09-17-2013 11:03 PM
Zero switching typically defines an SCR soft start where you either turn the device on or off when the voltage crosses 0 volts in an AC circuit. PWM is a completely different concept where you regulate the amplitude and time of a DC pulse to mimic an AC sign wave with the power devices turning on and off the RMS. What you have been asked to design needs some more definition
09-18-2013 01:59 AM
Top #3
Neil Tice
09-18-2013 01:59 AM
Are you talking about a resonant-link inverter?
09-18-2013 04:01 AM
Top #4
Andrew Boniface
09-18-2013 04:01 AM
If the input frequency is high enough, one can implement zero voltage switching by waiting from the "ideal" PWM switch point until the next zero crossing. This isn't very useful with 50Hz or 60Hz mains supply, but if one can choose the input power frequency, it does become an option.
09-18-2013 06:52 AM
Top #5
Nir Vaks
09-18-2013 06:52 AM
Please see the following link for additional information:
ftp://kavcrl.dyndns.org/%2BMEDIA/+ELECTRONICS/Books/Silovaya/TI/Zero%20Voltage%20Switching%20Resonant%20Power%20Conversion.pdf
09-18-2013 09:34 AM
Top #6
Anirban Joy
09-18-2013 09:34 AM
Thank you all for the input. I am aware of resonant link converters. I have worked with quasi-resonant converters before. I am not trying to implement such a system here. I am implementing a zero-voltage switching technique for a run of the mill H-bridge motor controller running from a dc link. I completed a spice simulation. I will update when I finish the project.
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