It consists of rectifier filter and voltage regulator circuits.
Unregulated power supply block diagram.
Unregulated power supplies contain a step down transformer rectifier filter capacitor and a bleeder resistor.
Unregulated power supply diagram.
Which now i will explain to you learn the unregulated power supply first.
The main disadvantage is that the output voltage is not constant.
In india a 1 ΓΈ supply is available at 230 volts.
Power supply block diagram.
Figure below shows the block diagram of a typical regulated dc power supply.
The load may be connected across the voltage regulator.
Regulated power supply circuit block diagram of regulated power supply.
The block diagram of a regulated dc power supply is shown in above figure.
The regulated power supply will accept an ac input and give a constant dc output.
You need to use a regulated power supply.
The circuit diagram indicates that the output of the power supply can be connected to the mains earth the dotted line.
Commonly the bridge rectifier is used in regulated power supply.
This allows the voltage to stay stable regardless of the amount of current consumed by the load provided the predefined limits are not exceeded.
As shown in the figure above a small step down transformer is used to reduce the voltage level to the devices needs.
A regulated dc power supply is essentially an unregulated power supply with the addition of a voltage regulator.
A regulated dc power supply is also known as a linear power supply it is an embedded circuit and consists of various blocks.
This type of power supply because of simplicity is the least costly and most reliable for low power requirements.
When the 0v line is not grounded the output voltage will float and can produce around 24v 75v with respect to earth this is by no means unsafe but can give of a little bite if the output is touched.
A step down transformer.
The basic building blocks of a regulated dc power supply are as follows.
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We have seen that smoothing capacitors can be used to change this pulsating dc from the rectifier either half wave of full wave to a reasonably smooth and ripple free dc supply to power electronic circuits or to charge batteries.
Some called these power supply that ac adapter.
Block diagram regulated supply.
Half wave unregulated power supplies are cheap and simple to construct that convert ac power to pulsating dc power.
A regulated power supply converts unregulated ac alternating current to a constant dc direct current a regulated power supply is used to ensure that the output remains constant even if the input changes.
It is good for a normal load.
The output of the transformer is a pulsating sinusoidal ac voltage which is converted to pulsating dc with the help of a rectifier.
The block diagram of a regulated power supply mainly includes a step down transformer a rectifier a dc filter and a regulator the construction working of a regulated power supply is discussed below.
Its function is to convert the ac mains voltage to the rectified dc voltage.
