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220V 50Hz to 115V 400Hz circuits shematic ?

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ibaltaci

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Hello

Im studying my last year in civil aviation university.My thesis subject is building up a 115v 400hz power supply.

So Im trying to figure out how to do it. I still couldnt find the shematic so couldnt start to build up yet, unfortunately.

Can anyone help me? Im open to all advices

Seems like I ll use a step down converter 220 to 115. Than I ll convert the frequency. But how ?

Regards
 
Seems like I ll use a step down converter 220 to 115. Than I ll convert the frequency.

The conventional way of doing this is to convert the 220v 500hz to DC, and then use the DC to power an inverter to create the 400hz.

JimB
 
No, you would convert it to DC. then convert the DC to 400Hz, followed by a transformer to get the 115V required.

It's basically an inverter, and like modern commercial ones you would use a switch mode true sinewave design (basically a class-D amplifier).

Historically I'm pretty sure it was simply a 220V 50Hz motor driving a 115V 400Hz generator.
 
Historically I'm pretty sure it was simply a 220V 50Hz motor driving a 115V 400Hz generator.
And if you want a large amount of power, it may still be the way to go.
 
Hello
At first appreciate that, really.

OK, I will invert the 220V AC to DC. So I ll use an inverter which inverts 220 to 115V ? Then how can i make the frequency 400hz ? I need to invert it to the DC bcoz of changing the frequency , then I ll invert it back to AC ?

Forgive my questions here, but as u know I need to be fully sure what am I doing now. Im really glad for your answers and that fast: really increadible.
 
Hello
At first appreciate that, really.

OK, I will invert the 220V AC to DC. So I ll use an inverter which inverts 220 to 115V ? Then how can i make the frequency 400hz ? I need to invert it to the DC bcoz of changing the frequency , then I ll invert it back to AC ?

Forgive my questions here, but as u know I need to be fully sure what am I doing now. Im really glad for your answers and that fast: really increadible.

You don't 'invert it' to DC, you just rectify it.

You then use a 400Hz inverter to make it AC again, at the frequency you require.

However, there don't seem to be any hobby designs out there for Class-D inverters, presumably because of the specialised transformers required?.
 
I got it. You said probably I cant find a scheme for Class D 400hz inverter. But I have to design it by myself, or anyway build it up. Also how to rectify it? 220 to 115 exactly . AyOu got any schematic for that? Dont consume that Im kğinda lazy. Just try to do my best on work. Thx for ur advices, appreciate that.
 
You use a transformer and a rectifier/capacitor to generate the DC as explained here.

For the PWM inverter, Google has some info.
 
I got it. You said probably I cant find a scheme for Class D 400hz inverter. But I have to design it by myself, or anyway build it up. Also how to rectify it? 220 to 115 exactly . AyOu got any schematic for that? Dont consume that Im kğinda lazy. Just try to do my best on work. Thx for ur advices, appreciate that.

You rectify the incoming 220V, giving about 320V DC - the switchmode circuit then switches that to a high frequency transformer (at 10's of KHZ) - it's this switchmode transformer that drops the voltage down. The output is then fed through a low pass filter to remove the high frequency, leaving the modulation frequency you used (in this case 400Hz).
 
Nigel is correct.

In the militay we used large 600 kW 380/660 Volts motors to drive alternators which changed the voltage and frequency to 115 and 416 Volts 400 Hz.
 
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