Aerospace and Electronic Systems Magazine March 2017 - 36

Closed-Loop Control System for Buck Converter

Figure 9.

Output voltage (vout) (green) and reference boltage (vref) (red)

Figure 10.

Change surface of fuzzy controller.

Figure 9 shows the simulation results of the circuit
shown in Figure 8.
As shown on Figure 9, the PI controlled buck converter
exhibits the following results:
C

The output voltage (green) follows the reference
voltage (red).

C

Rise time equals 0.01 s.

C

Steady state error equals (+/− 0.05) v.

DESIGN OF BUCK CONVERTER USING FUZZY LOGIC
CONTROLLER (FLC)
Fuzzy logic, proposed by Lofty Zadeh in 1965, emerged
as a tool to deal with uncertain, imprecise, or qualitative
decision making control problems. Controllers that combine intelligent and conventional techniques are commonly
used in the intelligent control of complex dynamic systems.
Therefore, embedded fuzzy controllers automate what has
traditionally been a human control activity.
So FLC is a control algorithm based on a linguistic
control strategy, which is derived from expert knowledge
into an automatic control strategy. FLC doesn't need any
difficult mathematical calculation like the other control systems. So it is one of the available answers today for a broad
class of challenging controls.
FLC controller has three principal components:
1. Fuzzifier: A fuzzyfication interface that converts input
data into suitable linguistic values.
2. Rule Base and Data Base: Both are known as knowledge
base that consists of a data base with the necessary linguistic definition and control rule set
3. Decision Making: A decision making logic, which is
simulating a human.
To design a fuzzy controller, fuzzy input shape and
fuzzy output shape must be constructed, then rules that
control the relation between the input and output of the
fuzzy controller must be determined to make the surface
of the fuzzy controller change as shown in Figure 10. In
36

Figure 11.

Closed-loop control for buck converter using an FLC.

IEEE A&E SYSTEMS MAGAZINE

MARCH 2017



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