3.a) Figure 1 shows the internal circuitry for a charger prototype. You, the development engineer, are required to do an

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3.a) Figure 1 shows the internal circuitry for a charger
prototype. You, the development engineer, are required to do an
electrical analysis of the circuit by hand to assess the operation
of the charger on different loads. The two output terminals of this
linear device are across the resistor, RL. You decide to reduce the
complex circuit to an equivalent circuit for easier analysis.
i) Find the Thevenin equivalent circuit for the network shown in
Figure 1, looking into the circuit from the load terminals AB.

3 A Figure 1 Shows The Internal Circuitry For A Charger Prototype You The Development Engineer Are Required To Do An 1 (70.96 KiB) Viewed 37 times

ii) Determine the maximum power that can be transferred to the
load from the circuit.
b) A microwave oven (ratings shown in Figure 2) is being
supplied with a single phase 120 VAC, 60 Hz source.

3 A Figure 1 Shows The Internal Circuitry For A Charger Prototype You The Development Engineer Are Required To Do An 2 (1.21 MiB) Viewed 37 times

When operating at rated conditions, a supply current of 14.7A
was measured. Given that the oven is an inductive load, do the
following:
i) Calculate the power factor of the microwave oven.
ii) Find the reactive power supplied by the source and
draw the power triangle showing all power components.
iii) Determine the type and value of component required to
be placed in parallel with the source to improve the power factor
to 0.9 leading.
20 V R1 www 40 R4 60 10A Figure 1 R2 30 R3 < 30 A B RL
SAMSUNG HOUSEHOLD MICROWAVE OVEN 416 MAETANDONG, SUWON, KOREA MODEL NO. SERIAL NO. 120Vac 60Hz LISTED MW850WA 71NN800010 Kw 1.5 MICROWAVE UL25 MANUFACTURED: NOVEMBER-2000 FCC ID : A3LMW850 MADE IN KOREA SEC THIS PRODUCT COMPLIES WITH OHHS RULES 21 CFR SUBCHAPTER J. Figure 2