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[moved] high power 24-48V pulse generator fm 12V bat'y

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bukol123

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Hello everyone, I need to make 24 to 48 volts; 3 amp maximum from a 12 volt battery. Variable frequency
Thanks for helping up
 

A boost converter makes it possible to step up 12V to 24-48 VDC.

You can turn a mosfet on and off, to obtain pulsed output from a DC supply.

What methods have you tried so far?
 

yes, as above and have an external error amplifier for the boost, and just change the reference into it to change the vout from 24 to 48v.
 

BradtheRad said:
A boost converter makes it possible to step up 12V to 24-48 VDC.

You can turn a mosfet on and off, to obtain pulsed output from a DC supply.

What methods have you tried so far?
Click to expand...

I have tried transformer but there is big power loss and also need to pulse. I am new to electronics. Learning by making small projects. Do you have a link to schematic.

Thanks
 

bukol123 said:
I have tried transformer but there is big power loss and also need to pulse. I am new to electronics. Learning by making small projects. Do you have a link to schematic.

Thanks
Click to expand...

I mean I connected directly from the engines alternator then to the transformer. What I am concerned is the loses.e same dC boost have some loses as the system I tried
 

bukol123 said:
I mean I connected directly from the engines alternator then to the transformer. What I am concerned is the loses.e same dC boost have some loses as the system I tried
Click to expand...

Although a raw alternator produces AC, the alternator in your car has diodes which rectify it into DC. (I assume yours is a normal system.)

Therefore do you get DC from your alternator, or AC ? This is important because a transformer works on AC, not DC.

Since you have a transformer, it is efficient to step up 12V to 48V via a transformer. But you must apply AC. This can be done with a full H-bridge.

Your output spec is 144 W (48V x 3A). To provide this, you need to draw 12 A (average) from your battery. Add 15 percent to make up for losses.
 

BradtheRad said:
Although a raw alternator produces AC, the alternator in your car has diodes which rectify it into DC. (I assume yours is a normal system.)

Therefore do you get DC from your alternator, or AC ? This is important because a transformer works on AC, not DC.

Since you have a transformer, it is efficient to step up 12V to 48V via a transformer. But you must apply AC. This can be done with a full H-bridge.

Your output spec is 144 W (48V x 3A). To provide this, you need to draw 12 A (average) from your battery. Add 15 percent to make up for losses.
Click to expand...

Yes I connected directly to the alternator and install a bridge to get DC my problem is how to pulse it
 

bukol123 said:
Hello everyone, I need to make 24 to 48 volts; 3 amp maximum from a 12 volt battery. Variable frequency
Thanks for helping up
Click to expand...

you cannot design a circuit without specs.

What exact device or output impedance vs frequency and V(t) supposed to look like. e.g. rise time, PW50 pulse width, tail time? What does I(t) look like ideally? WHat power limits?

What frequency range? or rather pulse repetition range?
WHat is purpose?
 

BradtheRad said:
A transistor can turn current on and off.



Instead of the manual switch, substitute a pulse generator made from a 555 IC.
Click to expand...

I have already constructed a 555 base pulser but it burned with 48 volts
 

SunnySkyguy said:
you cannot design a circuit without specs.

What exact device or output impedance vs frequency and V(t) supposed to look like. e.g. rise time, PW50 pulse width, tail time? What does I(t) look like ideally? WHat power limits?

What frequency range? or rather pulse repetition range?
WHat is purpose?
Click to expand...

Hello thanks for the reply, My project is an HHO booster Im trying to feed a pulse with a higher potential alongside the steady DC. So its a wild guess actually. I am looking into a 48 volts pulse maybe more. A frequency of 500 hz to 1 khz and a duty cycle of 25 to 75 %
 

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