Bidirectional CLLLC Resonant Converter Based on Frequency-Conversion and Phase-Shift Hybrid Control
Abstract
:1. Introduction
2. System Structure and Characteristic Analysis
2.1. Birirectional CLLLC Resonant Converter
2.2. Working Characteristics of Frequency-Conversion Control
- (1)
- Influence of inductance factor k on voltage gain
- (2)
- Influence of quality factor Q on voltage gain
2.3. Working Characteristics of Phase-Shift Control
3. Resonant Network Parameter Design
- (1)
- Turn ratio of transformer n
- (2)
- Transformer normalized voltage gain M
- (3)
- Parameter design of inductance coefficient k and quality factor Q
- (4)
- Design of resonant inductor and resonant capacitor
4. Frequency-Conversion and Phase-Shift Hybrid Control Strategy
5. Simulation Analysis
5.1. Forward Simulation
5.2. Reverse Simulation
6. Conclusions
- (1)
- Due to its complete symmetrical and good soft-switching characteristics, the bidirectional CLLLC resonant converter solves the problem where the traditional LLC resonant converter has different resonant states during the forward and reverse operations, and cannot achieve soft switching at the same time and is difficult to control.
- (2)
- The hybrid control method of frequency conversion and phase shift adopts frequency-conversion control at a higher voltage gain and phase-shift control at a lower voltage gain. It solves the problem of low voltage gain of the single frequency-conversion control method in the step-down mode, effectively broadens the output voltage range of the bidirectional CLLLC converter, and is suitable for wide-range output occasions. At the same time, it achieves zero-voltage switching and zero-current switching in the full load range, and has a high operating efficiency. This control method is convenient and easy to implement.
- (3)
- The control method proposed in this paper is superior to the traditional control method in reducing the switching frequency-conversion range and improving the efficiency of the converter, which is helpful in the popularization and application of the high-efficiency and high-power bidirectional DC/DC converter in the distributed new energy generation.
- (4)
- In the actual debugging process, it is difficult to establish an accurate model of a bidirectional CLLLC circuit. In the later stage, it is necessary to further analyze the circuit model to design more appropriate closed-loop control parameters and test how well it actually works.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
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Main Indicator | Parameter |
---|---|
input voltage range | 390–410 V |
rated input voltage | 400 V |
output voltage range | 250–430 V |
rated output voltage | 320 V |
maximal output power | 3.3 kW |
resonant frequency | 100 kHz |
Main Indicator | Parameter |
---|---|
primary-side resonant inductor (Lr1) | 18.76 |
primary-side resonant capacitor (Cr1) | 135.02 |
secondary-side resonant inductance (Lr2) | 12.01 |
secondary-side resonant capacitor (Cr2) | 210.97 |
magnetizing inductance (Lm) | 93.80 |
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© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Share and Cite
Jin, N.-Z.; Feng, Y.; Chen, Z.-Y.; Wu, X.-G. Bidirectional CLLLC Resonant Converter Based on Frequency-Conversion and Phase-Shift Hybrid Control. Electronics 2023, 12, 1605. https://doi.org/10.3390/electronics12071605
Jin N-Z, Feng Y, Chen Z-Y, Wu X-G. Bidirectional CLLLC Resonant Converter Based on Frequency-Conversion and Phase-Shift Hybrid Control. Electronics. 2023; 12(7):1605. https://doi.org/10.3390/electronics12071605
Chicago/Turabian StyleJin, Ning-Zhi, Yu Feng, Ze-Yu Chen, and Xiao-Gang Wu. 2023. "Bidirectional CLLLC Resonant Converter Based on Frequency-Conversion and Phase-Shift Hybrid Control" Electronics 12, no. 7: 1605. https://doi.org/10.3390/electronics12071605
APA StyleJin, N.-Z., Feng, Y., Chen, Z.-Y., & Wu, X.-G. (2023). Bidirectional CLLLC Resonant Converter Based on Frequency-Conversion and Phase-Shift Hybrid Control. Electronics, 12(7), 1605. https://doi.org/10.3390/electronics12071605