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# Power Supplies: Relation between VOLTAGE, FREQUENCY,CURRENT

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#### makifraza

##### Newbie level 4
Power Supplies: Relation between VOLTAGE, FREQUENCY,CURRENT,Wave

I want to understand the concepts involved in designing a power supply.
The relation between voltage and frequency i.e 110v at 60hz and 220v at 50hz
The power factors involved regarding the limits and good design process. When to use P=VI , P=I*2 R , P=V/R
The role of square,sine wave??? Why and where are they needed???
How power could burn the circuit. How designing of variable power supply is done????
So far i have searched various circuits on net all of them are different with respect to input and output voltages. So what are the common steps in designing all of them.

If you people could guide me to some post or threads regarding the design of power supply,i will be grateful...

Regards
M.Aakif Raza

Last edited:

the 1st answer you must give is , what is the power supply to be used for?
the output current, voltage , freq is dependent on what you are trying to power.

also you must understand the difference between AC and DC.
DC has no frequency, in that it is designed to be perfectly flat, any ac freq tones is considered noise.
the input voltage freq of a power supply is also based on what your source is, remember you cant 'make' power, are you running it off a wall socket? if so which country, are you running it off batteries? if so which kind.

thats the 1st thing you need to determine in a power supply design, whats feeding it, and what you plan to feed it to. (this determines its topology, ac to dc, dc to ac, dc to dc, ac to ac, step up, step down, inverting non inverting, etc)

-Pb

the 1st answer you must give is , what is the power supply to be used for?
the output current, voltage , freq is dependent on what you are trying to power.

also you must understand the difference between AC and DC.
DC has no frequency, in that it is designed to be perfectly flat, any ac freq tones is considered noise.
the input voltage freq of a power supply is also based on what your source is, remember you cant 'make' power, are you running it off a wall socket? if so which country, are you running it off batteries? if so which kind.

thats the 1st thing you need to determine in a power supply design, whats feeding it, and what you plan to feed it to. (this determines its topology, ac to dc, dc to ac, dc to dc, ac to ac, step up, step down, inverting non inverting, etc)

-Pb

Lets say i want to go for (1). AC to DC (2). DC to AC , So how will i go about those....
Case 1:
AC input of 240v and output of 12v DC
Case 2:
DC input of 12v from battery source to output of 240v AC.