Omron S82K Technical Information

Power Supply
Technical Information
Power Supply Overview
■What is a Power Supply?
Commercial AC power distributed from power plants cannot be
supplied directly to the ICs and other electronic components built
into electronic devices in automated office and factory equipment
without destroying the components due to the high voltage of
commercial AC power. Devices called power supplies or
regulated DC power supplies are therefore required to convert
commercial AC power into regulated DC power to drive ICs and
other electronic components.
■Regulated DC Power Supplies
The methods for controlling Regulated DC Power Supplies can
be largely classified into the following two types. Switch-mode
power supplies and linear power supplies are generally referred
to as power supplies. Currently, switch-mode power supplies are
the most prevalent.
Regulated
DC Power
Supplies
● Switch-mode Power Supplies
Switch-mode power supplies convert commercial AC power into
the required high-frequency DC power using the high-speed
switching of semiconductors. Switch-mode power supplies are
so compact, light, and efficient that they are used as power
supplies by most electronic devices.
Steps down the voltage with a high-
frequency (40 to 200 kHz) transformer.
Converts AC into DC
The primary and secondary sides are
by rectifying and
smoothing AC. insulated from each other.
AC IN
Pulse width
Controls the high-frequency
switching pulse width and
frequency to stabilize the output.
Switch-mode
Power
Supplies
Linear Power
Supplies
DC OUT
Detection
modulator circuit
Advantages
• Highly efficient.
• Compact, and light.
• A wide input voltage range.
Disadvantages
• Switching noise is generated.
• Large inrush current on primary side.
■Power Supply Selection
● Basic Selection Points
Factors to consider when selecting a Power Supply are provided
in the following diagram.
(1) Input Voltage
Each Power
Supply has an
input voltage
(2) Output Capacity (Voltage × Current)
range. Select the
Power Supply
according to the
available input
voltage.
Power Supply
(3) Safety Standards
Power Supplies
with UL, CSA, or
VDE approval, or
CE Marking are
available.
Technical Information
Power Supply
The maximum load capacity must be
less than the maximum output
capacity of the Power Supply.
(4) Shape and Mounting Method
Power Supplies of various shapes
are available. Use the most
suitable Power Supply according to
the application. Various mounting
brackets are also available.
Load
1