Question

Problem 2: A photovoltaic module is used to supply
constant 12 V that needed by a Tablet. Depending on insolation from
the Sun, the photovoltaic module’s output voltage is changing
between 18 V to 36 V (dc).

Thus, a buck converter is used between the netbook and the
photovoltaic module.

1) What is the duty ratio range of the dc/dc converter?

2) If the inductance of the buck converter inductor is 40 uH, what
is the minimum switching frequency to limit the current ripple in
the inductor to less than 1 A?

3) At constant 12 V, what is the minimum power consumption of the
Tablet to keep the inductor current always continuous?

4) For the operation condition stated in 3), draw (not simulate and
plot) the waveforms of i) switching status, ii)voltage cross the
diode , and iii) inductor current; mark the values for each
waveform

(please i need solutuon 1_2_3_4)

Answer #1

A buck converter has an input voltage V in = 24 V, switching
frequency f s = 100 kHz, duty ratio d = 50%, load resistance R L =
10 Ω , inductance 100 μH, and capacitance 680 μF.
1) Calculate the following values, and include units in your
answers :
a) Average output voltage, V_o
b) Average output current, I_o
c) Peak - to - peak current ripple, Δi_L
d) Output current that will cause the converter to enter...

A buck-boost converter has an input voltage V_in= 10 V,
switching frequency fs= 100 kHz, duty ratio d= 30%, load resistance
R_L= 20Ω, inductance =100 μH, and
capacitance= 680 μF.
1) Calculate the following values, and include units in your
answers:
a) Average output voltage,V_o
b) Average output current,I_o
c) Average input current,I_in
d) Average current through the inductor in steady-state
e) Peak-to-peak current ripple through the inductor, Δ_iL
f) Average inductor current that will cause the converter to
enter...

Design a Boost Converter with the following characteristics:
Vg = 100V, V = 200V, load power 800W, switching
frequency 100 kHz. For the design consider all elements to be
ideal.
1) What is the duty cycle, D?
2) What is the inductor average current, IL?
3) Design the inductor and capacitor so that the peak-to-peak
inductor current ripple is 40% of IL and the capacitor
peak-to-peak voltage ripple is 2.5 % of V.
4) Draw the waveforms of voltage and...

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