Modified sine wave inverter used as DC-DC converter?

P E Schoen · 2012-02-23T08:40:30+00:00

I'm looking into a battery-powered small vehicle (tractor) design which =will=20use a three-phase motor and VF controller, and I want to create the DC =bus,=20or link, voltage from several 12V SLA batteries. I will need 360 or 720 =VDC=20for 208/240 or 480 VAC motors.I thought about using some of the inexpensive modified sine wave =inverters=20available from Harbor Freight and other companies, where a 2000W =inverter=20can be obtained for about $150. My first thought was to rectify the =output=20and filter it, to get about 180 VDC and then use two or four in series =for=20the higher voltages. But I think these inverters create their own DC bus =using a switching power supply and then use high voltage transistors or=20IGBTs in a bridge which produces the modified sine wave.I have searched for schematics but most of them are for simple inverters =using a 60 Hz power transformer driven with a square wave, but that's =not=20what I want. And other schematics are like the reference designs for UPS =systems, which are probably similar to what I want, and they can have =either=20modified sine wave or true sine (PWM) outputs. It's probably not hard to =design and build my own, but if I can use off-the-shelf inverters then =I'll=20be ahead of the game.My next step is to open up one of the small inverters I have to see how =they=20are made, and maybe discover and measure the DC bus voltage, but if =anyone=20has the actual schematics for one of these, I'd appreciate a look at it. =Otherwise, I'll let you know what I find.Thanks,Paul=20

Feb 23, 2012 20 Replies

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Joerg 14 years ago

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I wonder how these will look after 2000h on German autobahns in harsh winter driving conditions :-)

Regards, Joerg http://www.analogconsultants.com/

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Modified sine wave inverter used as DC-DC converter?

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