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Basic electronics interview questions
Course: Analog Electronics (18PHY204)
6 Documents
Students shared 6 documents in this course
University: Amrita Vishwa Vidyapeetham
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Difference between UPS and INVERTER
UPS: The one power cable of your UPS is fixed in the power socket of your wall when the power is on.
So, the UPS keeps on getting a regular power supply from the mains when the power is on. This AC
power received from the mains power source continuously keeps on being converted to DC. This DC
power keeps on charging the battery of the UPS in a continuous charging mode. So, the battery of the
UPS is always kept charged during the time when the power is there in the mains. The output from the
battery goes to the Sine wave inverter of the UPS. It converts DC to AC and this feeds the equipment.
This makes it very clear that the power to your electrical gadget which is connected to the UPS is always
supplied from the battery. Due to the power always being drawn from the battery to the electrical
equipment, there is no time lag in case of electricity failure and the flow of the mains power stops. It is
only the battery of the UPS which stops from being charged since there is no power in the mains.
However, the backup power from the battery of the UPS keeps on being supplied uninterrupted till the
battery is discharged and is no more able to supply the power to the equipment. This is why we find that
the backup power of the battery of the UPS is of very short period ranging from 15 – 20 minutes upward.
The more is this backup time of the UPS battery, the more will be the cost of the UPS. Otherwise also,
the circuitry of the UPS is expensive making the UPS even of a small backup time more costly.
Inverter: As far as the power to the inverter is concerned, like UPS it also comes from the mains for the
inverter battery to get charged when there is no power cut off. The main difference between the inverter
and the UPS lies in the fact, that in an inverter, the power is directly sent to the output which is
connected by wiring to various appliances. At the same time the AC is also converted to DC and this DC is
constantly charging the battery. On the other hand, the power to the appliances is not directly sent to
the output but it goes from the battery of the UPS which keeps on getting discharged. A sensor and relay
mechanism checks whether the mains is ON or OFF in an inverter. When the mains get switched off, the
relay mechanism triggers to switch from mains to inverter. Rest is same like the UPS. Because of this
sensor and relay, there is a gap between triggering.
What is Switch-mode power supply?
The electronic power supply integrated with the switching regulator for converting the electrical
power efficiently from one form to another form with desired characteristics is called as
Switch-mode power supply. It is used to obtain regulated DC output voltage from unregulated
AC or DC input voltage.
Switch mode power supply