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# Circuit to reduce the DC VOLTAGE(>230V) to 3.5V

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#### vipinsaini

##### Junior Member level 3
how to reduce dc voltage

Is there anybody have a circuit which can reduce the dc voltage >230v(output of rectifier) to the 3.5V.

Thanks

reduce dc voltage

POWERINT.COM

or use TNY switch for isolation

reducing dc voltage

dear, is there any other circuit which can reduce the voltage without using transformer?

reduce voltage dc circuit

Dear vipinsaini

U can use the Voltage Divider Network to reduce the certain voltage. Use the Voltage Divider Formula to get the Corresponding Voltage

electronic circuit to reduce the watts

Dear Prabakaran
first of all i would like to say thanks to u for the suggestion and now i want to say that will voltage divider formula will be right to reduce the hight DC voltage in low DC voltage?

how to reduce voltage without transformer

What current do you expect after converting the 230VDC to 3.5 volts?

3.5v power source

After converting the voltage 230V(DC) to 3.5V(DC) the current is 1.5A.

how to reduce voltage of a dc power supply

Cough, cough, splutter.....

Using a voltage divider will work BUT:

R = V/I R= (230 - 3.5) / 1.5 equals 151 Ohms.

W = V*I W=((230 - 3.5) * 1.5 equals 339.75 Watts.

Add to that, if you reduce the load current, the voltage goes up to the full 230V. This is not a good idea!

Brian.

reduce usb voltage

vipinsaini said:
dear, is there any other circuit which can reduce the voltage without using transformer?
Even a SMPS will use a ferrite transformor. Other than that to get 1.5 amp current is to use a BIG resistor in series, as per the caculations given by "betwixt".

how to reduce 12v dc to 3.5v dc

Thanks dear betwixt & Pranam
I will try both ideas.

Regards
Er.VIPIN SAINI

steps to reduce direct current voltage

But is there also any other to reduce the DC VOLTAGE(>230V) to 3.5V[output current is 1.5A]............................?

led to 230v circuit formula

as for me, that's the best reply given by betwixt

want the circuit of 230v voltage regulator

I would suggest the easiest way is to chop the 230V with a 50/60 Hz oscillator then feed it into a step-down transformer. Better still, chop it into two phases and feed it into a transformer with two primary windings so you can minimize the core saturation problems you get with DC.

Before you ask, No, I'm not designing it for you.

Brian.

12-230v circuit

If accuracy is important, do not try to divide this voltage down using passive components. You may run into noise issues (and if you are not careful with component selection) you may also have heat dissipation problems. If this 3.5V is going to be used as a power supply for a microcontroller or any device that requires a reasonable amount of accuracy, then you'll also need to have it regulated. If the 3.5V is for a controller...most of these devices do not allow for large voltage swings. ususally only +0.5V or -0.5V.

Try go to https://www.vicorpower.com (dont worry, i dont work for them).

Shop around...try www.digikey.com to search for modules. I am sure that you'll find something.

For these sort of problems, its sometimes better to use a ready-made module (unless your problem is unique). If you cannot find a single module to do it in one shot, then you can do it in 2 stages...i.e...use 2 different modules. You'll avoid switching losses and parasitics.

circuit to reduce the current output

If I remember correctly,
some IC series from Power Int (mention by eem2am)
might have switching circuit that do not need transformer.

I found it...
"Reference Design Report for 3 W Non-
Isolated Constant Current LED Driver
Using LNK306DN"
The current rating is limited.

Perhaps you can try search for more.

Siong Boon

MODERATOR - SIGNATURE LINKS ARE NOT ALLOWED

how to reduce the voltage of a transformer?

Hey dear frnds....
i found that there is a VIPer IC22ADIP-E manufactured by ST Microelectronics.
With the help of this IC,we can build the low power SMPS without any transformer and optocoupler also.
It is available in two versions(ratings) which r given below::::

Output Version-1 VIPer22ADIP-E 12V at 350mA 4.2W
Output Version-3 VIPer22adip-E 16V at 350mA 5.6W

Thanks & Regards
Er.VIPIN SAINI

circuit to reduce current

vipinsaini said:
Hey dear frnds....
i found that there is a VIPer IC22ADIP-E manufactured by ST Microelectronics.
With the help of this IC,we can build the low power SMPS without any transformer and optocoupler also.
It is available in two versions(ratings) which r given below::::
Output Version-1 VIPer22ADIP-E 12V at 350mA 4.2W
Output Version-3 VIPer22adip-E 16V at 350mA 5.6W
Thanks & Regards
Er.VIPIN SAINI

You may be refering to TPS2020DR switches. But still then these devices cannot operate on 220VDC and your out put requirement of 1.5 Amps @3.5 volts. You may have a look at the datasheet here
https://datasheet.digchip.com/477/477-68024-0-TPS2020D.pdf

st viper 12 problem 230v

Those devices are for controlling power to USB, LAN and similar low voltage circuits in laptop computers to save battery power when they are not needed. They are of no use whatsoever as voltage regulators.

Please tell us why you need 3.5V at 1.5A, it may help us to find a solution to your needs.

Brian.

I just tracked down the information on the devices Er.VIPIN SAINI refers to. They are power MOSFET SMPS drivers. They can be used to deliver 3.5V at 1.5A with a suitable transformer but they need the rest of the SMPS circuit building around them. Used alone they will not work.

how to reduce voltage and current in the circuit

betwixt wrote:

Those devices are for controlling power to USB, LAN and similar low voltage circuits in laptop computers to save battery power when they are not needed. They are of no use whatsoever as voltage regulators.

Please tell us why you need 3.5V at 1.5A, it may help us to find a solution to your needs.

Brian.

I just tracked down the information on the devices Er.VIPIN SAINI refers to. They are power MOSFET SMPS drivers. They can be used to deliver 3.5V at 1.5A with a suitable transformer but they need the rest of the SMPS circuit building around them. Used alone they will not work.

Hey dear,First of all i would like say thx for the reply then i want to say that u have suggested me the POWER MOSFET which requires the trnsformer also but dear i want to get a ckt which don't requires the transformer.

si if u have any other circuit idea then reply me.
The voltage and current should be variable type i.e. they both(current & voltage) should vary according to our requirement.
but power should be constant.
The power requirement is 4WATT maximum.

Regards
Er.VIPIN SAINI

reduce voltage circuit

vipinsaini said:
si if u have any other circuit idea then reply me.
The voltage and current should be variable type i.e. they both(current & voltage) should vary according to our requirement.
but power should be constant.The power requirement is 4WATT maximum.
Regards
Er.VIPIN SAINI
Is this a request, order, sugession or quote? No one here is to design circuits and give you a perfect solution. It all needs a lot of effort, simulation and testing. If both current and voltage are variable, how can the power be constant? As you yourself are an Engineer (as per your profile) why dont you experiment and prove such a thing is possible? Also share your ideas with all of us. Cheers.

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