# How to create a DC-AC converter using MOSFETS?

Discussion in 'Homework Help' started by Halim.Akiki, Jan 1, 2015.

1. ### Halim.Akiki Thread Starter Member

Dec 29, 2014
44
1
Hello! I have a small project and i want to create a DC-AC inverter using only MOSFETS and diodes. Any ideas about the circuit?

2. ### ScottWang Moderator

Aug 23, 2012
4,781
759
1. Input V/I
2. Output V/I
3. How many components that you limited?
4. Sometimes you will need coil to help to generate the AC, do you inhibit to do that?

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3. ### Halim.Akiki Thread Starter Member

Dec 29, 2014
44
1
My input is a 14 V DC voltage resulting from an AC-DC converter connected to a 12 V battery. The output can be anything because this is a mini project for a lab at university and the purpose is only for us to understand the concept of the backup power system. I already made the full wave rectifier (diode bridge) and added a capacitor on it's output to make it DC. No load will be added we will just use an oscilloscope to verify the result. A hint was given that we have to use 4 MOSFETS and 4 diodes.

4. ### ScottWang Moderator

Aug 23, 2012
4,781
759
Your title and first post shown that you have to create a DC-AC inverter, but your post in #3 said these :
My input is a 14 V DC voltage resulting from an AC-DC converter connected to a 12 V battery.
What do you really want, DC-AC,AC-DC,DC-DC?

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5. ### Halim.Akiki Thread Starter Member

Dec 29, 2014
44
1
No. It's an AD-DC followed by a DC-AC. Te AC-DC charges the battery and the DC-AC converts the 12V of the battery to AC to be used while power breakdown.

6. ### ScottWang Moderator

Aug 23, 2012
4,781
759
Do they like these:
AC-DC : converts AC220V to 14V?
14V charging 12V battery?
DC-AC : converts the 12V battery to AC220V?

So what want is to converts 12V to AC220V, in this situation you will need a transformer, but you said that you only can used 4 mosfets and 4 diodes?

7. ### Halim.Akiki Thread Starter Member

Dec 29, 2014
44
1
I
I want to transform 14 V DC to 14 V AC using 4 mosfets and 4 diodes.

8. ### ScottWang Moderator

Aug 23, 2012
4,781
759
From DC to AC, you will need transformer or coil, inductance, I haven't see the way no such components ...

The mosfet as a switch, but it needs transformer to generate the power from secondary.