UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 120V 400Hz Three phase sine wave inverter.

Ed_Dinning · 7th Sep 2017, 9:08 am

Hi Gents, for those interested in making an electronic inverter there are now numerous chips available to drive BLDC and similar motors at only a few pounds each; some even have moderate power output stages within the chip.
This would not be the solution for Argus as he wanted a fixed frequency, but if you want a range of frequencies this system works well.
There were designs published in WW several years ago that used simple TTL circuits driving FET output stages and could be used to power aircraft instrumentation.

3 phase full wave rectification; this gives a ripple of 4% without the use of capacitors and is much used on LV high current plating supplies. It does however put a very poor power factor back onto the supply.

Ed

7th Sep 2017, 9:08 am	#9
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,195	Re: 120V 400Hz Three phase sine wave inverter. Hi Gents, for those interested in making an electronic inverter there are now numerous chips available to drive BLDC and similar motors at only a few pounds each; some even have moderate power output stages within the chip. This would not be the solution for Argus as he wanted a fixed frequency, but if you want a range of frequencies this system works well. There were designs published in WW several years ago that used simple TTL circuits driving FET output stages and could be used to power aircraft instrumentation. 3 phase full wave rectification; this gives a ripple of 4% without the use of capacitors and is much used on LV high current plating supplies. It does however put a very poor power factor back onto the supply. Ed