Figure 1.
The basic family of second-order converters: (a) buck, (b) boost, and (c) buck-boost converters.
Figure 1.
The basic family of second-order converters: (a) buck, (b) boost, and (c) buck-boost converters.
Figure 2.
Fourth order (FO) converters: (a) Cuk, (b) SEPIC, and (c) Zeta converters.
Figure 2.
Fourth order (FO) converters: (a) Cuk, (b) SEPIC, and (c) Zeta converters.
Figure 3.
Fourth order version of the basic family of converters: (a) FO-buck, (b) FO-buck-boost, and (c) FO-boost (super-boost) converters.
Figure 3.
Fourth order version of the basic family of converters: (a) FO-buck, (b) FO-buck-boost, and (c) FO-boost (super-boost) converters.
Figure 4.
Equivalent circuits of the super-boost converter according to the switching state (a) when the switch is closed and (b) when the switch is open.
Figure 4.
Equivalent circuits of the super-boost converter according to the switching state (a) when the switch is closed and (b) when the switch is open.
Figure 5.
Comparison of stored energy in inductors between the traditional boost and the super-boost converter for a case with the same input current ripple.
Figure 5.
Comparison of stored energy in inductors between the traditional boost and the super-boost converter for a case with the same input current ripple.
Figure 6.
Comparison of stored energy in capacitors between the traditional boost and the super-boost converter for a case with the same output voltage ripple.
Figure 6.
Comparison of stored energy in capacitors between the traditional boost and the super-boost converter for a case with the same output voltage ripple.
Figure 7.
The proposed improved super-boost ISB converter.
Figure 7.
The proposed improved super-boost ISB converter.
Figure 8.
Equivalent circuits when the transistor is (a) on and (b) off.
Figure 8.
Equivalent circuits when the transistor is (a) on and (b) off.
Figure 9.
The stored energy in inductors is compared between the traditional boost, the super boost, and the proposed ISB converter.
Figure 9.
The stored energy in inductors is compared between the traditional boost, the super boost, and the proposed ISB converter.
Figure 10.
Comparison of stored energy in capacitors between the traditional boost, the super-boost converter, and the proposed converter for a case with the same output voltage ripple.
Figure 10.
Comparison of stored energy in capacitors between the traditional boost, the super-boost converter, and the proposed converter for a case with the same output voltage ripple.
Figure 11.
Result of the design with the traditional boost converter.
Figure 11.
Result of the design with the traditional boost converter.
Figure 12.
Result of the design with the super-boost converter.
Figure 12.
Result of the design with the super-boost converter.
Figure 13.
Result of the design with the proposed topology.
Figure 13.
Result of the design with the proposed topology.
Figure 14.
Result of the design with the Cuk converter topology.
Figure 14.
Result of the design with the Cuk converter topology.
Figure 15.
Result of the design with the SEPIC converter topology.
Figure 15.
Result of the design with the SEPIC converter topology.
Figure 16.
Result of the design with the Zeta converter topology.
Figure 16.
Result of the design with the Zeta converter topology.
Figure 17.
Input current ripple for all solutions in the full operation range vs. the converter gain G; they were designed to have an input current ripple of 0.6 A in the worst case; for all converters, the worst case is when G = 2.
Figure 17.
Input current ripple for all solutions in the full operation range vs. the converter gain G; they were designed to have an input current ripple of 0.6 A in the worst case; for all converters, the worst case is when G = 2.
Figure 18.
Stored energy in inductors for all topologies in the full operation range vs. the converter gain G.
Figure 18.
Stored energy in inductors for all topologies in the full operation range vs. the converter gain G.
Figure 19.
Output voltage ripple for all solutions in the full operation range vs. the converter gain G; they were designed to have an input current ripple of 0.6 A in the worst case; for all converters, the worst case is when G = 2.
Figure 19.
Output voltage ripple for all solutions in the full operation range vs. the converter gain G; they were designed to have an input current ripple of 0.6 A in the worst case; for all converters, the worst case is when G = 2.
Figure 20.
Stored energy in capacitors for all topologies in the full operation range vs. the converter gain G.
Figure 20.
Stored energy in capacitors for all topologies in the full operation range vs. the converter gain G.
Figure 21.
From button to top: the switching function of the transistor s, current through inductors, and input current when Vg = 70 V, Vo = 200 V, Po = 400 W.
Figure 21.
From button to top: the switching function of the transistor s, current through inductors, and input current when Vg = 70 V, Vo = 200 V, Po = 400 W.
Figure 22.
From button to top: the switching function of the transistor s, current through inductors, and input current when Vg = 85 V, Vo = 200 V, Po = 400 W.
Figure 22.
From button to top: the switching function of the transistor s, current through inductors, and input current when Vg = 85 V, Vo = 200 V, Po = 400 W.
Figure 23.
From button to top: the switching function of the transistor s, current through inductors, and input current when Vg = 100 V, Vo = 200 V, Po = 400 W.
Figure 23.
From button to top: the switching function of the transistor s, current through inductors, and input current when Vg = 100 V, Vo = 200 V, Po = 400 W.
Figure 24.
Switching function “s”, capacitors and output voltage (Vg = 70 V, Vo = 200 V, Po = 400 W).
Figure 24.
Switching function “s”, capacitors and output voltage (Vg = 70 V, Vo = 200 V, Po = 400 W).
Figure 25.
Switching function “s”, capacitors and output voltage (Vg = 85 V, Vo = 200 V, Po = 400 W).
Figure 25.
Switching function “s”, capacitors and output voltage (Vg = 85 V, Vo = 200 V, Po = 400 W).
Figure 26.
Switching function “s”, capacitors and output voltage (Vg = 100 V, Vo = 200 V, Po = 400 W).
Figure 26.
Switching function “s”, capacitors and output voltage (Vg = 100 V, Vo = 200 V, Po = 400 W).
Figure 27.
Closed-loop test, the input voltage Vg changes from 100 V to 70 V and then 100 V again, Vo is regulated to 200 V, Po = 400 W.
Figure 27.
Closed-loop test, the input voltage Vg changes from 100 V to 70 V and then 100 V again, Vo is regulated to 200 V, Po = 400 W.
Figure 28.
Closed-loop test in which the output power Po changes from 400 W to 80 W, and then it increases back to 400 W again, Vo is regulated to 200 V.
Figure 28.
Closed-loop test in which the output power Po changes from 400 W to 80 W, and then it increases back to 400 W again, Vo is regulated to 200 V.
Figure 29.
Closed-loop test, the input voltage Vg changes from 100 V to 85 V and then 100 V again, Vo is regulated to 200 V, Po = 400 W.
Figure 29.
Closed-loop test, the input voltage Vg changes from 100 V to 85 V and then 100 V again, Vo is regulated to 200 V, Po = 400 W.
Figure 30.
Closed-loop test, the output power Po changes from 400 W to 300 W and then, it increases back to 400 W again, Vo is regulated to 200 V.
Figure 30.
Closed-loop test, the output power Po changes from 400 W to 300 W and then, it increases back to 400 W again, Vo is regulated to 200 V.
Figure 31.
Prototype photo.
Figure 31.
Prototype photo.
Table 1.
Conventional boost converter design.
Table 1.
Conventional boost converter design.
Inductor L and Capacitor C | L = 250 µH and C = 32.5 µF |
---|
Peak current in the inductor | 6.6243 A |
Peak stored energy in the inductor | 5.5 mJ |
Stored energy in the capacitor | 651.3 mJ |
Table 2.
Super-boost converter design.
Table 2.
Super-boost converter design.
Inductors L1 and L2 | L1 = 500 µH, L2 = 500 µH |
---|
Capacitor C1 and C2 | C1 = 10.83 µF, C2 = 3.125 µF |
Peak current in L1 | 4.1693 A |
Peak current in L2 | 3 A |
Peak stored energy in inductors | 5.9 mJ |
Stored energy in both capacitors | 280.6 mJ |
Table 3.
Proposed converter results.
Table 3.
Proposed converter results.
Inductor L1 and L2 | L1 = 250 µH, L2 = 250 µH |
---|
Capacitor C1 and C2 | C1 = 10.83 µF, C2 = 6.25 µF |
Peak current in inductor L1 | 4.6243 A |
Peak current in inductor L2 | 3 A |
Peak stored energy in inductors | 3.7 mJ |
Stored energy in capacitors | 270.9 mJ |
Table 4.
Cuk converter results.
Table 4.
Cuk converter results.
Inductor L1 and L2 | L1 = 333.33 µH, L2 = 333.33 µH |
---|
Capacitor C1 and C2 | C1 = 9.14 µF, C2 = 6.25 µF |
Peak current in inductor L1 | 6.4921 A |
Peak current in inductor L2 | 3 A |
Peak stored energy in inductors | 8.3 mJ |
Stored energy in capacitors | 538.8 mJ |
Table 5.
SEPIC converter results.
Table 5.
SEPIC converter results.
Inductor L1 and L2 | L1 = 333.33 µH, L2 = 333.33 µH |
---|
Capacitor C1 and C2 | C1 = 35.27 µF, C2 = 37.03 µF |
Peak current in inductor L1 | 6.4921 A |
Peak current in inductor L2 | 3 A |
Peak stored energy in inductors | 8.3 mJ |
Stored energy in capacitors | 919.1 mJ |
Table 6.
Zeta converter results.
Table 6.
Zeta converter results.
Inductor L1 and L2 | L1 = 333.33 µH, L2 = 333.33 µH |
---|
Capacitor C1 and C2 | C1 = 12.34 µF, C2 = 6.25 µF |
Peak current in inductor L1 | 6.4921 A |
Peak current in inductor L2 | 3 A |
Peak stored energy in inductors | 8.3 mJ |
Stored energy in capacitors | 373.6 mJ |