Power supplies convert electric current from a source to the correct voltage, current, and frequency required by electrical devices. They have an input connection that receives power and output connections that deliver power to loads. There are different types including DC, AC, programmable, uninterruptible, high voltage, and bipolar power supplies. Power supply specifications include input/output voltages and currents, efficiency, temperature range, and protection features like overvoltage and overcurrent protection. Common applications of power supplies include converting household AC current to lower DC voltages required by electronics and providing stable, regulated power.

1. POWER SUPPLY
PREPARED BY ATHEENA PANDIAN
BasicsofBiomedical

2. PRESENTATION
OUTLINE
TOPICS TO BE
DISCUSSED
1. What is Power
Supply?
Functions
Uses
Types
Applications
1.
2.
3.
4.
5.

3. WHATISPOWER
SUPPLY?
A power supply
is an electrical
device that
supplies
electric power
to an electrical
load.

4. The primary function of a
power supply is to
convert electric current
from a source to the
correct voltage, current,
and frequency to power
the load.
PRIMARY FUNCTION
Power Supply

5. POWER SUPPLY
Power supplies are
sometimes referred
to as electric power
converters.
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6. All power supplies have
a power input connection,
which receives energy in the
form of electric current from a
source, and one or more power
output connections that deliver
current to the load.
CONNECTIONS - POWER SUPPLY

7. DC power supply1.
a. AC-to-DC supply
b. Switched-mode power
supply
c. Linear regulator
2. AC power supplies
a. AC adapter
3. Programmable power supply
4. Uninterruptible power supply
5. High-voltage power supply
6. Bipolar power supply
Types of Power
Supply

8. A DC (direct current) power
supply converts electrical energy
in the form delivered by
the power company to a form
required by some device.
DC power supplies are usually
designed to supply energy at a
certain voltage and current.
DC power
supply

9. An AC power supply typically
takes the voltage from a wall
outlet (mains supply) and uses a
transformer to step up or step
down the voltage to the desired
voltage.
AC power supplies can be
divided into single
phase and three phase systems.
AC power
supply

10. A programmable power supply is
one that allows remote control of
its operation through an analog
input or digital interface such as
RS232 or GPIB.
Programmable
power supply

11. An uninterruptible power
supply or uninterruptible power
source (UPS) is an electrical
apparatus that provides
emergency power to a load when
the input power source or mains
power fails.
Uninterruptible
power supply

12. A high voltage power supply is a
complex power conversion
circuit that converts a
lower voltage potential to
a higher voltage potential.
High voltage power supplies can
operate from DC or AC
input voltages.
High voltage
power supply

13. A bipolar power supply is a four-
quadrant tool that operates in
quadrants one, two, three, and
four of the Cartesian coordinate
system.
This means it provides positive
and negative voltages across its
output terminals without needing
to switch any external wiring.
Bipolar
power
supply

14. ACPOWERSUPPLY
VS
DCPOWERSUPPLY
In direct current (DC), the
electric charge (current) only
flows in one direction. Electric
charge in alternating
current (AC), on the other hand,
changes direction periodically.
The voltage in AC circuits also
periodically reverses because
the current changes direction.

15. SPECIFIEDATTRIBUTES
FORAPOWERSUPPLY
INCLUDE:
Input voltage type (AC or DC) and range
Efficiency of power conversion
The amount of voltage and current it can
supply to its load
How stable its output voltage or current is
under varying line and load conditions
How long it can supply energy without
refueling or recharging (applies to power
supplies that employ portable energy
sources)
Operating and storage temperature
ranges
1.
2.
3.
4.
5.
6.

16. POWERSUPPLY
SPECIFICATIONS SCP - Short circuit protection
OPP - Overpower (overload) protection
OCP - Overcurrent protection
OTP - Overtemperature protection
OVP - Overvoltage protection
UVP - Undervoltage protection
1.
2.
3.
4.
5.
6.

17. Linear regulated power
supplies are able to offer
exceedingly low levels of output
noise and good stabilisation,
but at the expense of size and
efficiency.
Linear power supplies are
widely used because of
the advantages they offer in
terms of overall performance.
APPLICATIONS

18. THANK
YOU