16 1. EXTRACTION OF UNCERTAIN MODEL OF DC-DC CONVERTERS
According to the analysis results, the converter with parameters given in Table 1.2 can be
modeled, as shown in Fig. 1.8.
Table 1.2: e buck converter parameters (see Fig. 1.2)
Nominal Value
Output voltage, Vo 20 V
Duty ratio, D 0.4
Input DC source voltage, Vg 50 V
Input DC source internal resistance, rg 0.5 Ω
MOSFET drain-source resistance, rds 40 mΩ
Capacitor, C 100 µF
Capacitor Equivaluent Series Resistance (ESR), rC 0.05 Ω
Inductor, L 400 µH
Inductor ESR, rL 10 mΩ
Diode voltage drop, vD 0.7 V
Diode forward resistance, rD 10 mΩ
Load resistor, R 20 Ω
Switching Frequency, Fsw 20 KHz
1.4. DYNAMICS OF A BUCK CONVERTER WITHOUT UNCERTAINTY 17
49.875 + 9975000
2
+ 1203 + 2.5237
6257.7 + 1251540000
2
+ 1203 + 2.5237
-0.0499
2
- 10008.942 - 5788400
2
+ 1203 + 2.5237
()
()
()
()
()
()
()
()
()
()
+
-
+
Figure 1.8: Dynamic model of the converter.
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