Aerospace and Electronic Systems Magazine March 2017 - 38

Closed-Loop Control System for Buck Converter

Figure 16.

2 kHz switching frequency.

Figure 14.

Designed buck converter circuit.

Figure 15.

Buck converter circuit connected to an oscilloscope.

controllers are obtained using an oscilloscope as shown in Figure 15
based on switching frequency equals 2 kHz as shown in Figure 16.

Figure 17.

(a) Output voltage and reference voltage. (b) Output voltage rise time.

RESULTS OF BUCK CONVERTER USING INTEGRAL (I)
CONTROLLER
After programming of microcontroller as integral (I) controller, we
get the following results:
Figure 17(a) shows that the output voltage follows the reference and Figure 17(b) shows that rise time equals 0.024 s.

RESULTS OF BUCK CONVERTER USING PROPORTIONAL
AND INTEGRAL (PI) CONTROLLER
After programming of the microcontroller as the PI controller, we
obtain the following effects: Figure 18(a) shows that output voltage follows the reference, and Figure 18(b) shows that rise time
equals 0.01. So, rise time in the case of the PI controller is improved by comparison with the integral controller case.

CONCLUSION
In this paper, four control schemes have been proposed for DC-DC
buck converter output voltage control. Design procedures of FLC,
38

Figure 18.

(a) Output voltage and reference voltage. (b) Output voltage rise time.

IEEE A&E SYSTEMS MAGAZINE

MARCH 2017



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