1. Power Conditioners and Uninterruptible Power Supplies
Chapter 11
Power Conditioners and Uninterruptible Power Supplies
Becoming more of a concern as utility de-regulation proceeds
Chapter 11 Power Conditioners
and UPS

2. Distortion in the Input Voltage
The voltage supplied by the utility may not be sinusoidal
Chapter 11 Power Conditioners
and UPS

3. Typical Voltage Tolerance Envelope for Computer Systems
This has been superceded by a more recent standard
Chapter 11 Power Conditioners
and UPS

4. Typical Range of Input Power Quality
Chapter 11 Power Conditioners
and UPS

5. Electronic Tap Changers
Controls voltage magnitude by connecting the output to the appropriate transformer tap
Copyright © 2003
by John Wiley & Sons, Inc.
Chapter 11 Power Conditioners
and UPS

6. Uninterruptible Power Supplies (UPS)
Block diagram; energy storage is shown to be in batteries but other means are being investigated
Copyright © 2003
by John Wiley & Sons, Inc.
Chapter 11 Power Conditioners
and UPS

7. UPS: Possible Rectifier Arrangements
The input normally supplies power to the load as well as charges the battery bank
Chapter 11 Power Conditioners
and UPS

8. UPS: Another Possible Rectifier Arrangement
Consists of a high-frequency isolation transformer
Chapter 11 Power Conditioners
and UPS

9. UPS: Another Possible Input Arrangement
A separate small battery charger circuit
Chapter 11 Power Conditioners
and UPS

10. Battery Charging Waveforms as Function of Time
Initially, a discharged battery is charged with a constant current
Copyright © 2003
by John Wiley & Sons, Inc.
Chapter 11 Power Conditioners
and UPS

11. UPS: Various Inverter Arrangements
Depends on applications, power ratings
Chapter 11 Power Conditioners
and UPS

12. Chapter 11 Power Conditioners
UPS: Control
Typically the load is highly nonlinear and the voltage output of the UPS must be as close to the desired sinusoidal reference as possible
Chapter 11 Power Conditioners
and UPS

13. UPS Supplying Several Loads
With higher power UPS supplying several loads, malfunction within one load should not disturb the other loads
Chapter 11 Power Conditioners
and UPS

14. Another Possible UPS Arrangement
Functions of battery charging and the inverter are combined
Chapter 11 Power Conditioners
and UPS

15. UPS: Using the Line Voltage as Backup
Needs static transfer switches
Chapter 11 Power Conditioners
and UPS