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A charger supplies 100 W at 20 V for charging the battery of a laptop. The power devices, used in the converter inside the charger, operate at a switching frequency of 200 kHz. Which power device is best suited for this purpose?
- a)IGBT
- b)Thyristor
- c)MOSFET
- d)BJT
Correct answer is option 'C'. Can you explain this answer?
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A charger supplies 100 W at 20 V for charging the battery of a laptop....
Introduction
In order to determine the best power device for a charger that supplies 100 W at 20 V with a switching frequency of 200 kHz, we need to consider the characteristics and suitability of different power devices. The options given are IGBT, Thyristor, MOSFET, and BJT. Among these options, the MOSFET is the most suitable power device for this purpose. Below, we will explain why.
MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor)
- MOSFETs are widely used in power electronic circuits due to their fast switching characteristics, high efficiency, and low on-state resistance.
- They are suitable for high-frequency applications, such as the given switching frequency of 200 kHz.
- MOSFETs have a low gate drive current requirement, which reduces the power losses in the control circuitry.
- They can handle both high voltage and high current, making them suitable for charging a laptop battery at 20 V.
- MOSFETs have a low on-state resistance (RDS(on)), which helps in reducing power losses and improving overall efficiency.
Other Power Devices
- IGBT (Insulated Gate Bipolar Transistor): IGBTs are commonly used in applications that require high voltage and high current switching. However, they have a slower switching speed compared to MOSFETs, making them less suitable for high-frequency applications like the given 200 kHz switching frequency.
- Thyristor: Thyristors are primarily used for AC power control applications and are not suitable for high-frequency switching.
- BJT (Bipolar Junction Transistor): BJTs are commonly used in low-power applications and are not suitable for the given power requirement of 100 W at 20 V.
Conclusion
Based on the characteristics mentioned above, the most suitable power device for a charger that supplies 100 W at 20 V with a switching frequency of 200 kHz is the MOSFET. Its fast switching speed, high voltage and current handling capability, low gate drive current requirement, and low on-state resistance make it an ideal choice for this application.
In order to determine the best power device for a charger that supplies 100 W at 20 V with a switching frequency of 200 kHz, we need to consider the characteristics and suitability of different power devices. The options given are IGBT, Thyristor, MOSFET, and BJT. Among these options, the MOSFET is the most suitable power device for this purpose. Below, we will explain why.
MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor)
- MOSFETs are widely used in power electronic circuits due to their fast switching characteristics, high efficiency, and low on-state resistance.
- They are suitable for high-frequency applications, such as the given switching frequency of 200 kHz.
- MOSFETs have a low gate drive current requirement, which reduces the power losses in the control circuitry.
- They can handle both high voltage and high current, making them suitable for charging a laptop battery at 20 V.
- MOSFETs have a low on-state resistance (RDS(on)), which helps in reducing power losses and improving overall efficiency.
Other Power Devices
- IGBT (Insulated Gate Bipolar Transistor): IGBTs are commonly used in applications that require high voltage and high current switching. However, they have a slower switching speed compared to MOSFETs, making them less suitable for high-frequency applications like the given 200 kHz switching frequency.
- Thyristor: Thyristors are primarily used for AC power control applications and are not suitable for high-frequency switching.
- BJT (Bipolar Junction Transistor): BJTs are commonly used in low-power applications and are not suitable for the given power requirement of 100 W at 20 V.
Conclusion
Based on the characteristics mentioned above, the most suitable power device for a charger that supplies 100 W at 20 V with a switching frequency of 200 kHz is the MOSFET. Its fast switching speed, high voltage and current handling capability, low gate drive current requirement, and low on-state resistance make it an ideal choice for this application.
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A charger supplies 100 W at 20 V for charging the battery of a laptop. The power devices, used in the converter inside the charger, operate at a switching frequency of 200 kHz. Which power device is best suited for this purpose?a)IGBTb)Thyristorc)MOSFETd)BJTCorrect answer is option 'C'. Can you explain this answer?
Question Description
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