What does SMPS stand for?
A
Switching Motor Power Source
B
Switched Mode Power Supply
D
Smart Modular Power Supply
Analysis & Theory
SMPS stands for Switched Mode Power Supply, a type of power supply that uses switching regulators.
Which of the following best describes how SMPS works?
A
By continuously regulating voltage using a transformer
B
By switching on/off the input and using energy storage components
C
By converting AC to DC using only resistors
D
By using pure inductive loads
Analysis & Theory
SMPS works by rapidly switching transistors and storing energy in inductors or capacitors to regulate output.
Which of the following is NOT an advantage of SMPS?
Analysis & Theory
SMPS is lightweight and compact, unlike linear power supplies which are bulky.
Which type of SMPS configuration converts DC to AC?
Analysis & Theory
A DC-AC converter is a type of SMPS that converts direct current to alternating current (inverter).
What is the typical efficiency range of SMPS?
Analysis & Theory
SMPS typically has high efficiency, often between 80% and 90% or more.
What is a major disadvantage of SMPS compared to linear power supplies?
C
More electrical noise (EMI)
Analysis & Theory
SMPS generates more electrical noise (EMI) due to high-frequency switching.
Which semiconductor devices are commonly used in SMPS switching circuits?
Analysis & Theory
MOSFETs and IGBTs are preferred in SMPS due to their fast switching and low losses.
Which component in SMPS stores energy during the OFF period of the switch?
Analysis & Theory
Capacitors and inductors store and release energy to maintain a stable output voltage.
What is the main role of the feedback circuit in SMPS?
A
To increase switching frequency
B
To protect the transformer
C
To regulate the output voltage
D
To control the EMI filter
Analysis & Theory
The feedback circuit monitors and regulates the output voltage by adjusting the duty cycle.
Which of the following is a typical application of SMPS?
C
Mobile chargers and computer power supplies
Analysis & Theory
SMPS is widely used in mobile chargers, laptops, TVs, and desktop computers for efficient power conversion.