Correct Answer - Option 3 : Generates strong electomagnetic interference field
In SMPS the effect of noise and electromagnetic interference is quite significant, thus EMI filters are required. The conventional linear power supply is immune to noise and electromagnetic interference. Hence option 3 is correct.
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PARAMETERS
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LINEAR POWER SUPPLY
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SWITCH MODE POWER SUPPLY (SMPS)
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Definition
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It completes the stepping down of AC voltage first then it converts it into DC.
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It converts the AC input signal into DC first then it steps down the voltage up to the desired level.
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Efficiency
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Low efficiency i.e. about 20-25%
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High Efficiency i.e. about 60-65%
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Voltage Regulation
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Voltage regulation is done by voltage regulator.
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Voltage regulation is done by the feedback circuit.
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Magnetic material used
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CRGO core is used
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The ferrite core is used
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Weight
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It is bulky.
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It is less bulky in comparison to the linear power supply.
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Reliability
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More reliable in comparison to SMPS.
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Its reliability depends on the transistors used for switching
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Complexity
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Less complex than SMPS.
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More complex than the Linear power supply.
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Transient response
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It possesses a faster response.
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It possesses a slower response.
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RF interference
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No RF interference
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RF shielding is required as switching produces more RF interference.
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Noise and Electromagnetic interference
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It is immune to noise and electromagnetic interference.
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The effect of noise and electromagnetic interference is quite significant, thus EMI filters are required.
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Applications
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Used in Audio frequency applications and RF applications.
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Used in chargers of mobile phones, DC motors, etc.
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