# I wish to convert 27v input to 100v 1A output

#### aliamin94ma

Joined Oct 25, 2020
17
hi,there is 27 volt ( input voltage ) and i need to have 100 volt output . anyone can help me how to do that ?

#### Ian0

Joined Aug 7, 2020
9,842
Do you already have a power supply of >100V, or do you wish to convert the 27V input to 100V output? At how much current?

#### aliamin94ma

Joined Oct 25, 2020
17
Do you already have a power supply of >100V, or do you wish to convert the 27V input to 100V output? At how much current?
i dont have power supply, i wish to convert 27v input to 100v 1A output

#### Ian0

Joined Aug 7, 2020
9,842
Try Texas Instruments' power supply designer
https://webench.ti.com/power-designer/
Type "27V" into the "input" and "100V 1A" into the output and see what it recommends.
Don't forget that your 27V will have to supply 4A.

#### Tonyr1084

Joined Sep 24, 2015
7,905
All this talk about converting a voltage - but nobody has said, or asked, if it's AC or DC voltage you want to convert. There are starkly differing methods for each.

FYI - 100V at 1 amp means 27V at 3.7 amps. And that's with 100% efficiency in converting from one to the other. And you NEVER get 100% efficiency; there's always a loss. 27V at 3.7A = 100W. And 100V at 1A = 100W. Again, that's at 100% efficiency. So depending on how much losses you have and depending on which method of converting 27 to 100 volts - you're going to need more than 3.7 amps at 27 volts.

#### Ian0

Joined Aug 7, 2020
9,842
All this talk about converting a voltage - but nobody has said, or asked, if it's AC or DC voltage you want to convert.
Nor what frequency, nor what accuracy!
I was assuming it was DC. For 50/60Hz AC, all it would need is a 110V primary, 30V secondary transformer used in reverse.

#### MisterBill2

Joined Jan 23, 2018
18,576
The fact that an AMPLIFIER was requested tells us that a great deal of explanation is required.

#### Tonyr1084

Joined Sep 24, 2015
7,905
a great deal of explanation is required.
So true. But people sometimes use terms incorrectly. Just because WE know what an amplifier is - doesn't mean all people know. To me - an amplifier is something most often used with audio equipment. However, it can also be used in data transmission or other applications where a low current signal needs to be boosted. But a "Voltage Amplifier"? Well, it's possible we're still talking audio or some other frequency such as a radio transmitter. But if I look purely at the term "Voltage" I'm assuming (a dangerous thing to do) is changing one voltage into another.

As already stated: AC is transformed into a different voltage most often via a "Transformer". DC converters "Convert" the DC voltage into either another DC voltage OR into an AC voltage. Whereas rectifying an AC voltage into a DC voltage - that's most often done via a rectifier or a set of rectifiers. When going from AC to DC and incorporating filtering (a.k.a Capacitor) the resulting voltage will be higher because AC is most often tested at its RMS value. However, the peak voltage will be higher when rectified and filtered. 100 volts AC rectified to DC with a filter becomes 141.4 volts DC.

Now, depending on how much load is on the power supply (again assuming - forgive me) the voltage will drop anywhere from a little to a lot. So like MisterBill2 said - "A Great Deal Of Explanation Is Required". Without further explanation - there's nothing we can do to assist. At least nothing more that I can add.

#### aliamin94ma

Joined Oct 25, 2020
17
i think i need dc convertor circuit which can convert 27V 1.5Amp to 100V 0.5Amp

#### Ian0

Joined Aug 7, 2020
9,842
So you want to put 40.5 Watts in and get 50 Watts out? Where's the missing 9.5 Watts going to come from?

#### aliamin94ma

Joined Oct 25, 2020
17
max range of supplier is 27V with 1.8Amp.

#### Ian0

Joined Aug 7, 2020
9,842
max range of supplier is 27V with 1.8Amp.
Make that 27V @ 2.05A to allow for 90% conversion efficiency.

#### aliamin94ma

Joined Oct 25, 2020
17
ok

#### Ian0

Joined Aug 7, 2020
9,842
So, Did TI's Webench give you a satisfactory solution?

#### KeepItSimpleStupid

Joined Mar 4, 2014
5,088
100Vac is suspicious for Japan mains; 27VDC might be common.

Who knows?

#### aliamin94ma

Joined Oct 25, 2020
17
So, Did TI's Webench give you a satisfactory solution?
yes, but i want to know is there any circuit (with transistor and op-amp) that i can achieve this goal . webench just helped to find dc-dc convertor.

#### BobTPH

Joined Jun 5, 2013
8,998
Look up boost converter.

Bob

#### ericgibbs

Joined Jan 29, 2010
18,865
yes, but i want to know is there any circuit (with transistor and op-amp) that i can achieve this goal
You need a DC to DC Boost converter.
E

#### Papabravo

Joined Feb 24, 2006
21,226
yes, but i want to know is there any circuit (with transistor and op-amp) that i can achieve this goal . webench just helped to find dc-dc convertor.
The only way this would be possible is if you already have a +100V power supply. Amplifiers do not do power conversion; they use an existing supply to make a "copy" of low level signals. Only a DC-DC converter can do what you have asked.

#### MisterBill2

Joined Jan 23, 2018
18,576