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Buck-H three-phase inverter topology.

Buck-H three-phase inverter topology.

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Schematic diagram of traction transmission system of CRH5 EMU.
Buck-H three-phase inverter topology.
Single-phase new switch mode inverter.
Schematic diagram of main principle waveforms: (A) waveform of...
+15 Equivalent circuit diagram of each switching mode: (A) ST1 is on, Q11...
A High Power Quality Buck-H Auxiliary Power Converter in Railway Applications
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  • Jul 2022
DC voltage utilization and AC voltage harmonics are important evaluation indexes for Auxiliary Power Converter in Railway Applications. To improve the above two indicators, a novel switch-mode modulation method and quasi-PR control strategy for Buck-H three-phase inverter is proposed in this paper. The Buck-H three-phase inverter integrates the AC...
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... As one of the cores, the bidirectional DC/DC converters are widely used in new energy power generation and battery charging and discharging applications (Premkumar et al, 2019;Chen et al, 2022;Lu et al, 2022;Madhana and Mani, 2022;Fang et al, 2023;Samad et al, 2023). Due to the simple circuit structure and control strategy, the bidirectional buck/boost circuit is one of the most popular DC/DC converters (Li et al., 2023;Lan et al, 2022). In order to reduce the size of the filter and improve the power density of the system, the converter needs to be operated at a higher switching frequency (Marxgut et al, 2014;Reusch and Strydom, 2015;Tao et al, 2021;Cai et al, 2022). ...
Current observer-based critical conduction mode control of a bidirectional DC–DC converter in battery charging/discharging applications
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A current observer-based digital critical conduction mode control of a bidirectional DC–DC converter with full-range soft switching for battery charging/discharging applications is proposed in this paper. Under the proposed control method, the bidirectional DC/DC converter operates in the critical continuous mode (CRM), the full-range zero-voltage switching (ZVS) can be achieved, and the inductor current ripple can be optimized. The CRM control is achieved by the proposed current observer, and the zero-crossing detection (ZCD) analog circuit or current sampling circuit can be eliminated. Therefore, compared with existing methods, the design complexity of the hardware circuit can be simplified. In addition, the proposed current observer can estimate the inductor current over a wide range of load and voltage variations. Therefore, the proposed control method can be applied to a wide range of charging and discharging applications. Finally, a prototype with 30–60 V input voltage, 24 V output voltage, and 75–150 kHz switching frequency is built. The experimental data and waveforms prove the correctness and advantages of the solutions proposed in this paper.
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