A Soft-Switched DC/DC Converter Using Integrated Dual Half-Bridge with High Voltage Gain and Low Voltage Stress for DC Microgrid Applications
Abstract
:1. Introduction
2. Structure and Operating Principles of the Proposed Converter
2.1. General Structure
2.2. Operation Modes
- (1)
- The inductor Lk shows the total inductance of leakage inductors Lk1 and Lk2.
- (2)
- all passive and active semiconductors are considered ideal; and
- (3)
- the capacitors are large enough to assume that their voltage is constant during one switching period.
2.2.1. Mode 1 [t0–t1]
2.2.2. Mode 2 [t1–t2]
2.2.3. Mode 3 [t2–t3]
2.2.4. Mode 4 [t3–t4]
2.2.5. Mode 5 [t4–t5]
2.2.6. Mode 6 [t5–t6]
2.3. Voltage Gain
2.4. Voltage Stress Across Switches and Diodes
2.5. The Magnetizing Inductor Minimum and Maximum Currents im1 and im2
2.6. ZVS Soft-Switching Conditions for Switches SM and SC
2.7. Current Stress of Power Switches and Diodes
2.8. Comparison with Other High Step-Up Converters
2.9. Loss Analysis of Proposed Converter
2.9.1. Conduction Loss of Switches
2.9.2. Switching Loss of Transistors
2.9.3. Diode Losses
2.9.4. Inductor Losses
2.9.5. Transformer Losses
3. Design Considerations
3.1. Selection of Turns Ratio
3.2. Choice of Leakage Inductance
3.3. Choice of Magnetizing Inductance
3.4. Choice of Boost Inductance
3.5. Design of Capacitors
4. Simulation and Experimental Results
4.1. Simulation Results
4.1.1. Full Load Condition (Vin = 22 V, Po = 1000 W, and D = 0.65)
4.1.2. Light Load condition (Vin = 22 V, Po = 100 W, and D = 0.48)
4.2. Experimental Results
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Item | Converter Cited in [26] | Converter Cited in [27] | Converter Cited in [28] | Converter Cited in [29] | Proposed Converter | |
---|---|---|---|---|---|---|
Voltage gain | ||||||
Switch voltage stress | ||||||
Diode voltage stress | ||||||
No. of Components | S 1 | 4 | 2 | 4 | 2 | 2 |
D 2 | 2 | 3 | 4 | 6 | 4 | |
C 3 | 4 | 3 | 5 | 6 | 7 | |
L 4 | 0 | 0 | 2 | 0 | 1 | |
No. of Transformer or coupled inductors | 2 | 2 | 1 | 2 | 2 | |
Soft-switching | Soft switching (ZVS) | Hard switching | Soft switching (ZVS) | Hard switching | Soft switching (ZVS) | |
Control circuit | Complex | Simple | Complex | Simple | Simple |
Parameter | Value |
---|---|
Input DC-voltage (Vin) | 15–30 V |
Output voltage (Vo) | 400 V |
Output power (Po) | 1000 W |
Switching frequency (fs) | 100 kHz |
Magnetizing inductance (Lm1 and Lm2) | 100 µH |
Leakage inductance (Lk1 and Lk2) | 10 µH |
Turns ratio of coupled inductors (n) | 1.5 |
Switches | EPC2047 (200 V, 160 A, 10 mΩ) |
Diodes | C3D10065E |
Output capacitors (Co1, Co2, Co3, and Co4) | 47 µF |
Switched capacitors (Cm1 and Cm2) | 10 µF |
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Moradisizkoohi, H.; Elsayad, N.; Mohammed, O. A Soft-Switched DC/DC Converter Using Integrated Dual Half-Bridge with High Voltage Gain and Low Voltage Stress for DC Microgrid Applications. Inventions 2018, 3, 63. https://doi.org/10.3390/inventions3030063
Moradisizkoohi H, Elsayad N, Mohammed O. A Soft-Switched DC/DC Converter Using Integrated Dual Half-Bridge with High Voltage Gain and Low Voltage Stress for DC Microgrid Applications. Inventions. 2018; 3(3):63. https://doi.org/10.3390/inventions3030063
Chicago/Turabian StyleMoradisizkoohi, Hadi, Nour Elsayad, and Osama Mohammed. 2018. "A Soft-Switched DC/DC Converter Using Integrated Dual Half-Bridge with High Voltage Gain and Low Voltage Stress for DC Microgrid Applications" Inventions 3, no. 3: 63. https://doi.org/10.3390/inventions3030063