AC DC Power supply
                     AC DC Power supply
AC-DC power supply converts AC to DC . This 
supply is supplied with AC voltage (usually from 
the power outlet of the power company) and 
converts the voltage to the DC voltage  supplied to 
.the consumer
The voltage supplied by the power company to outlets 
in homes around the world is AC voltage . Therefore, 
any electrical product that operates using DC voltage 
(such as a computer screen) can not be supplied from 
the home socket, but provides AC-DC power that 
converts the AC voltage in the home socket to DC 
voltage with a voltage level appropriate to the same 
.device (e.g. + 12 volts)
In home electrical appliances there is usually a 
built-in internal AC-DC power supply that converts 
the AC mains voltage to various DC voltages for 
the purpose of operating the appliances (e.g. on a 
.stationary computer)
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There are isolated power supplies and 
non-isolated power supplies . In insulated 
power supplies there is electrical insulation 
between the input of the power supply and 
its output. This insulation provides 
protection against electric shock 
(compliance with safety standards). These 
power supplies are branded power 
supplies (operating at a high internal 
frequency). In contrast, in non-insulated 
power supplies there is no electrical 
insulation between the input and output.
AC-DC power supplies include control of 
the output voltage as a function of input 
.voltage and outputs
There are AC-DC power supplies with a 
number of different outputs for operating 
different consumer functions at different 
.output voltages
AC-DC power supplies typically have various 
protections such as short-circuit output protection, 
output overload protection, input voltage drop 
protection below minimum threshold voltage and 
internal over-temperature protection and power 
.paralysis
There are AC-DC power supplies that can be adjusted 
to various parameters such as changing the output 
voltage level, limiting the output current and more. 
Changing these parameters is usually done through 
one or more of the following ways: manual control via a 
button interface on the power supply, RS232 
(ETHERNET) communication connector ) and a control 
.connector for supplying external tuning voltages