1. By: Professor Wilmer Arellano
Power Supplies
By: Professor Wilmer Arellano

2. Acknowledgment Switching Regulator (Texas Instruments)
AN-556 Introduction to Power Supplies
Microelectronic Circuits By: Sedra/Smith

3. Overview Important Facts Classification AC to DC Power Supplies
Diode Rectifier
Filter
Voltage Regulator
DC to DC Converters
Buck Regulator
Boost Regulator
Inverting Regulator
Other Configurations

4. Important Facts
Power Supplies now comprise a worldwide segment of the electronics market in excess of $5 billion annually.
Virtually all electronic equipments are powered by a DC power supply.

5. Classification
AC/DC
DC/DC
DC/AC

6. AC to DC Power Supplies

7. Diode Rectifiers

8. Diode Rectifiers

9. Diode Rectifiers

10. Filter

11. Filter

12. Filter

13. Voltage Regulator

14. Voltage Regulator

15. Voltage Regulator Full-wave Bridge Power Supply
Center-tap Power Supply

16. Adjustable Negative Regulator
Voltage Regulator
Adjustable Positive Regulator
Adjustable Negative Regulator

17. Voltage Regulator

19. DC to DC Converters
This type falls under the category of switching power supplies.
Switching is controlled by Pulse Width Modulation.
Popular because of high efficiency and high power density.
Obtain higher, lower, or inverting DC voltages.
Three main types of converters:
Buck Regulator
Boost Regulator
Inverting Regulator
Other Configurations

20. DC to DC Converters Buck Regulator
The most commonly used switching converter is the Buck, which is used to down-convert a DC voltage to a lower DC voltage of the same polarity.
This is essential in systems that use distributed power rails (like 24V to 48V), which must be locally converted to 15V, 12V or 5V with very little power loss.

21. DC to DC Converters

22. DC to DC Converters

23. DC to DC Converters BOOST REGULATOR
The Boost regulator takes a DC input voltage and produces a DC output voltage that is higher in value than the input (but of the same polarity).
The Boost regulator is shown in Figure 31, along with details showing the path of current flow during the switch on and off time.

24. DC to DC Converters

25. DC to DC Converters BUCK-BOOST (INVERTING) REGULATOR
The Buck-Boost or Inverting regulator takes a DC input voltage and produces a DC output voltage that is opposite in polarity to the input.
The negative output voltage can be either larger or smaller in magnitude than the input voltage.

26. DC to DC Converters

27. DC to DC Converters FLYBACK REGULATOR
The Flyback is the most versatile of all the topologies, allowing the designer to create one or more output voltages, some of which may be opposite in polarity.
Flyback converters have gained popularity in battery-powered systems, where a single voltage must be converted into the required system voltages (for example, +5V, +12V and -12V) with very high power conversion efficiency.

28. DC to DC Converters

29. DC to DC Converters

30. DC to DC Converters

35. Review Important Facts Classification AC to DC Power Supplies
Diode Rectifier
Filter
Voltage Regulator
DC to DC Converters
Buck Regulator
Boost Regulator
Inverting Regulator
Other Configurations

36. &
Questions
Answers