A High-Power DC-DC Converter Topology for Battery Charging Applications
Abstract
:1. Introduction
2. Circuit Operations
- (1)
- Two transformers of T1 & T2 have the turns-ratio of n = NS1/NP1 = NS2/NP2 and include the leakage inductors of Llk1 and Llk2, respectively.
- (2)
- The magnetizing inductor (Lm2) of T2 has a sufficient large value to ignore the effect of the magnetizing current.
- (3)
- All the active switches have the same output capacitance of COSS.
- (4)
- The output inductor has a sufficient large value so that it can be seen as a current source.
3. Circuit Analysis
3.1. DC Analysis
3.2. Output Inductor
3.3. Soft Switching Characteristic
3.4. Operation of the Proposed Converter During Battery Charging
3.5. Voltage Stress
3.6. Loss Comparison and Component Counts
4. Experimental Results
- VIN = 400 V, VO = 250–430 V, IO(max) = 16.3 A
- Switching frequency: fS = 100 kHz
5. Conclusions
- (1)
- Considerable reduction of both primary- and secondary-conduction losses due to the parallel connection in the primary side and the use of two lower-voltage-rated diodes in the secondary side
- (2)
- Additional reduction of primary-conduction loss by no circulating current
- (3)
- Much better turn-ratio by less duty-loss compared to the conventional PSFB converter
- (4)
- Wider ZVS range in all the switches
- (5)
- Much smaller output inductor size
- (6)
- Easy-to-increase power handing capability
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Diodes | Proposed Converter | Single PSFB Converter | Parallel-Connected PSFB Converter |
---|---|---|---|
D1-4 | 2nVIN (488V) | nc1VIN (560V) | nc1VIN (560V) |
D5-8 | Not used | Not used | nc1VIN (560V) |
Da1&a2 | nVIN (244V) | Not used | Not used |
Items | Proposed Converter | Single PSFB Converter | Parallel-Connected PSFB Converter |
---|---|---|---|
Switch | 8 | 4 | 8 |
Diode | 6 | 4 | 8 |
Transformer | 2 | 1 | 2 |
Resonant inductor | 0 | 1 | 2 |
Output inductor | 1 | 1 | 2 |
Total | 17 | 11 | 22 |
Part | Items |
---|---|
Main switches (Q1–Q8) | IPW65R080CFDA |
Rectifier diodes (D1–D4) | C4D20120D (1200 V, 33 A, Vf = 2.2 V) |
Auxiliary diodes (Da1, Da2) | FFH50US60S (600 V, 50 A, Vf = 1.54 V) |
Transformers (T1, T2) | EE6565, n = 0.61 For T1, Lm = 855.8 µH, Llk = 8.26 µH For T2, Lm = 845.2 µH, Llk = 8.32 µH |
Output inductor (Lo) | 200 µH, CH467060#2 |
Output capacitor (Co) | 47 µF |
Controller | TMS320F28335 |
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Lee, I.-O.; Lee, J.-Y. A High-Power DC-DC Converter Topology for Battery Charging Applications. Energies 2017, 10, 871. https://doi.org/10.3390/en10070871
Lee I-O, Lee J-Y. A High-Power DC-DC Converter Topology for Battery Charging Applications. Energies. 2017; 10(7):871. https://doi.org/10.3390/en10070871
Chicago/Turabian StyleLee, Il-Oun, and Jun-Young Lee. 2017. "A High-Power DC-DC Converter Topology for Battery Charging Applications" Energies 10, no. 7: 871. https://doi.org/10.3390/en10070871