Continue to Site

# centre taped and full bridge invertor

Status
Not open for further replies.

#### ismu

##### Full Member level 2
what is the differnce b/w centre taped and full bridge sine wave invertor ,which is cost effective & performance?

Class B transformer more expensive, but only one Vds/ Vce volt drop. Bridge, transformer cheaper, two transistor volt drops and four power devices plus added complexity. I would get quotes for the different sort of transformers and see what the price difference is, and then you can work out will this pay for the extra semiconductors.
Frank

ismu

### ismu

Points: 2
i have one more doubt : assume i have one bridge trmer , Vin=230 Vo=10V N1=230 turns and N2=10turns

here Vin/Vo=N1/N2 , my doubt is can i change N1=23 and N2=1 , bcs now also Vin/Vo=N1/N2 , and i can save copper price .

you cannot.
you would have several problems.
just check magnetic circuits' equations.
since the L will reduced drastically, you will definitely have short circuit problem. Furthermore the ransformer will not work near the knee of B-H curve etc

ismu

### ismu

Points: 2
can you share the all related equations?

The equations use symbols, and I unfortunately do not know how to type symbols here.
Dynamic Simulation of Electrical Machinery by: Chee-mun Ong pages:88-92.

Electric Machines Analysis and design by: Jim Cathey pages:142-150.

or any other book that discuss magnetic circuits.

ismu

### ismu

Points: 2
A non mathematical approach is that the limited primary inductance is a loss where current flows through it but does not get to the output. So suppose your working frequency is F HZ, then the primary inductance should have an impedance say, at least 10 times the reflected load impedance at F HZ. This is why 50 HZ transformers are wound with many turns of wire on a laminated iron core and high frequency transformers are wound with a much lower number of turns on a ferrite transformer. Radio frequency transformers may not have any cores at all.
Frank

ismu

### ismu

Points: 2
i have one more doubt : assume i have one bridge trmer , Vin=230 Vo=10V N1=230 turns and N2=10turns

here Vin/Vo=N1/N2 , my doubt is can i change N1=23 and N2=1 , bcs now also Vin/Vo=N1/N2 , and i can save copper price .
u can reduce production cast , use primary winding copper & 2ndry winding aluminum .its 200% reduce production cast .

ismu

### ismu

Points: 2
is there any disadvantags with aluminum windings?

it has about 60% of copper conductivity. so, higher resistance, so higher temperature. you may need to increase diameter of your wire.There is a aluminum oxide , I think it is not good heat transfer that means the heat can be imprison in your windings. I am not sure about second sentence.

ismu

### ismu

Points: 2
Its really difficult to get a good long term connection to an aluminium conductor.
Frank

ismu

Points: 2