Chapter 3: Inverters and UPS
7. Define an Inverter and list its major classifications. (3 Marks)
Definition: A power electronic device that converts Direct Current (DC) to Alternating Current (AC).
Types:
Modified Sine Wave: Commonly used for general electrical appliances.
Pure (True) Sine Wave: Complex and expensive; used for sensitive medical equipment.
Solar Inverter: Powered by solar energy (Stand-alone, Battery back-up, or Grid-tie).
8. Explain the difference between Offline and Online UPS. (4 Marks)
Offline UPS: Directly supplies power from the mains; only switches to the battery backup when the mains power fails.
Online UPS: Continuously supplies power from the battery regardless of the mains status; it constantly converts AC to DC and back to AC.
Application: UPS provides emergency power to critical loads without interruption to prevent data loss or equipment damage
.
9. What is SMPS? List its key features. (3 Marks)
Definition: Switched-Mode Power Supply; efficiently converts electrical power into different voltage levels.
Features:
High efficiency and compact size.
Provides multiple output options.
Includes built-in overload and short-circuit protection
No comments:
Post a Comment