hi everyone
i need to build up a boost converter
with input voltage 12v dc and output voltage 180v dc
and around 7 amp output current
is that possible with 12 v dc input or we need more voltage in?
itswill be use for a dc motor with input voltage out to 180vdc maximum
what kind of chip i need ?
i need the schematic circuit with it vallues?
plez i need your helps

 

You are taking on quite a challenge since the output power of you supply will be 7*180 or 1260 Watts. Even with a highly efficient boost converter you will need to input 1.5 Kilowatts.

What are you powering with this supply?

hgmjr

 

So What kind of Converter iam going to Use
i need 180v with 7 amp current
i need the circuit
Can you help me to build up the circuit ????
i can use more input voltage max to 36vdc max (3 battries )

i need it for the dc motor of course iam going to Use A Voltage controller
and (potentio meter )

 

1500/12 equates to 125 Amps at the input of your supply. That is a hefty amount of current.

I am not familiar with any components that can switch that amount of current.

hgmjr

 

So What kind of Converter iam going to Use

One bought from a professional power supply designer. All joking aside... Like hgmjr mentioned you are tallking about 1500 Watts assuming you have an 85% efficient converter-- which is 'really' an assumption for a fivefold high current boost. This is irregardless of whether you are using 12V or 36V input. Even with 36V input you are still looking at >35A input current. You are going to have to have monster sized components.

Maybe after you tells us the application someone might have a solution -- paralleling or multi-phase etc..

 

So What should I do
Do You have any opinion for my Project
Iam Going To Buld Up an electric car
I got the dc motor with 180v max
and series 3000 and 1.5hp
the problem that i have
i dunno how to get 180v
and how Can i move the car
Where can i find a dc motor controller since the tradmill controller is useless becuse it take the ac part and i need dc
can you give me suggetions

 

This willwork for you:
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=95596
As I suggested earlier, your conroller is already AC, just convert to AC and use that. John

 

although the figures match up i doubt that inverter is good for driving motors, most of those inverters strictly say not to use motors with them.

 

There are many possibilities. Here are two:

For 12V http://rocky.digikey.com/WebLib/InternationalRectifier/Web Data/IRF3703.pdf

For 36V http://www.irf.com/product-info/datasheets/data/irfp4710pbf.pdf

Personally, I'd try to find four matched 48V motors.

 

For that kind of voltage increase, you will definitely need to use a flyback-boost typology. I have designed a 1KW boost converter for a car amplifier, I will try to find a schematic around.

You must come up with something slick to handle the 125A you will encounter. Probably looking at copper bus-bars of some sort. You can find MOSFETs that can handle that kind of current, but you are better off using paralleled FETs. These larger FETs will require a decent gate driver, probably in the order of 4 or more amperes sink/source. You do not want to be operating in the linear region for long with that sort of current, it will fry the FETs in no time.

I would pick up a good book in transformer design. You will probably end up with many parallel strands of an easy to wind magnet wire gauge for the primary.

Good luck

Steve

 

our instructor
dont want us to use inverter
he want us to use buck -boost converter (dc-dc) at least 4 battries
48 vdc input to 180 vdc with 7 amp current output
where can i find a good dc motor controller
do you have a good sites
help me for this

 

As has already been pointed out, a buck-boost converter for that current will not be easy. Ask your instructor for some hints. John

 

Can you Give ME a good prove its will not work So i can tell our instructor it will not be easy so we can use inverter instead
i will be greatful for u guys

 

although the figures match up i doubt that inverter is good for driving motors, most of those inverters strictly say not to use motors with them.

The manual for that particular inverter does not include a restriction against motors. In fact, it says power tools can be used.

However, that is not really the point. The motor being used by the OP is a brushed DC motor that comes with its own rectifier and controller. Thus, even though the sinewave quality from a cheap inverter may be poor, it's going to be converted back to DC.

The OP now reports that they are required to design and build a buck-boost converter that will produce approximately 2 kW at 180 VDC from 12-V storage batteries. That apparently has to be done before they can get on with the meat of the project, which seems to have somethig to do with robotics. Frankly, I think that is a bit ambitious for a one-year school project, and there seems to be a need to clearly define the scope and goal of the project. John

 

Can you Give ME a good prove its will not work So i can tell our instructor it will not be easy so we can use inverter instead
i will be greatful for u guys

Go here and enter your specifications: Vin=12-14 V; Vout=180 V; Iout=10 A. Linear will respond that it can't help you. Of course, that doesn't prove it won't work...logically that is simply not possible to prove. A little searching, though, will show you it will not be easy with that topology.

http://www.linear.com/pc/viewCategory.jsp?navId=H0,C1,C1003,C1042&gclid=COnbra-fgJICFSGWGgodBi6T9A

John

 

As for the motor controller check out OSMC
http://tech.groups.yahoo.com/group/osmc/

It can be modified to support almost any motor, but yours should work with the standard
layout.

Good luck

 

aaroni,

I don't think that is what he is after. I have taken a look at the OSMC in the past, it seems that they just build a fancy h-bridge controller. The OP seeks a boost converter for use as a motor driver.

As for a reason why you shouldn't use a standard boost converter. You will need to operate the converter at a ~93.5% duty cycle. Extreme duty cycles impose inefficiently small off-times or low switching frequencies. Lower switching frequency causes higher ripple and requires larger magnetics.

Steve