Analysis and Implementation of a Bidirectional Converter with Soft Switching Operation

Lin, Bor‐Ren

doi:10.3390/pr10030561

Cited by 4 publications

(5 citation statements)

References 21 publications

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“…Hybrid converters are obtained from the conventional DC-DC converters by inserting switched-capacitor or switched-inductor cells in their structure [23]. Compared to the initial converter, a DC-DC hybrid converter has a higher voltage conversion ratio at the same duty cycle, being appropriate for applications where conventional DC-DC converters are operating with degraded performances due to very low or very high duty cycle values.…”

Section: Bhsc Topologymentioning

confidence: 99%

“…The total switch stress of the converter is obtained by summing the products between the maximum voltage and maximum current of each switching device, as shown in Equation (23).…”

Section: Comparison With Other Convertersmentioning

confidence: 99%

“…Soft switching techniques could be used to reduce switching losses and improve efficiency for a bidirectional, isolated DC-DC converter [23] that was intended only for battery power storage-not for supercapacitors. A symmetrical resonant circuit was employed to achieve zero voltage or current switching.…”

Section: Introductionmentioning

confidence: 99%

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A Common-Ground Bidirectional Hybrid Switched-Capacitor DC–DC Converter with a High Voltage Conversion Ratio

et al. 2023

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Electrical energy conversion and storage in DC systems, with increasing importance in industry, requires DC–DC power electronic converters with performances adapted to today’s requirements. In recent years, the applications of DC–DC converters have expanded, including energy storage management strategies, due to the use of supercapacitors for energy storage instead of—or together with—rechargeable batteries, in order to improve overall performance. This article presents a non-isolated, common-ground, bidirectional hybrid switched-capacitor DC–DC converter, which can be efficiently used for supercapacitor charging/discharging, due to its high voltage conversion ratio. The hybrid converter was obtained from the conventional bidirectional buck topology, inserting an “active” switched-capacitor cell. In addition to the high voltage conversion ratio, the switched-capacitor cell brings another important advantage: decreasing the values of all passive components without interrupting the input to the output ground path. All of these positive features were revealed through theoretical analysis and confirmed through digital simulations and experiments, proving that the hybrid converter performs well in both operating modes, with a smooth transition between them.

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Section: Bhsc Topologymentioning

confidence: 99%

“…The total switch stress of the converter is obtained by summing the products between the maximum voltage and maximum current of each switching device, as shown in Equation (23).…”

Section: Comparison With Other Convertersmentioning

confidence: 99%

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A Common-Ground Bidirectional Hybrid Switched-Capacitor DC–DC Converter with a High Voltage Conversion Ratio

et al. 2023

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“…In terms of circuit topology, many different types of isolated power converters have been discussed in battery charging [17][18][19][20][21][22][23][24][25][26]. Avila et al raised a multicell and multiterminal, bidirectional flyback for an electric-vehicle-battery charging system [17].…”

Section: Introductionmentioning

confidence: 99%

“…Kushwaha et al introduced a non-rectifier for the electric-vehicle-charging system integrating Zeta and Luo converters on the primary side [23]. Lin presented a new soft-switching, direct-current converter with a wide output-voltage range for a battery charger [24]. Wu et al proposed a new isolated, multiwinding, coupled-inductor converter applied to the battery-charging system [25].…”

Section: Introductionmentioning

confidence: 99%

A Multifunctional, Non-Constant Current Charger Based on a Dual-Switching, Bidirectional Flyback Converter

et al. 2022

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This study implements a multifunctional charger based on a dual-switching, bidirectional flyback converter (DSBFC). The proposed charger adopts seven charging methods, including the incremental-current charging, constant-voltage (CV) charging, constant-current (CC) charging, pulse-current (PC) charging, triangular-current (TC) charging, sinusoidal-current (SC) charging, and positive/negative pulse-current (Reflex) charging methods. The charging process of a lithium-ion battery is divided into three stages: an initial term, a mid-term, and a final term. In the initial term, the incremental-current charging method is used in the initial term of charging for a soft start and to inhibit an increase in temperature. In the mid-term, five charging methods, including CC, PC, TC, SC, and Reflex-current charging, are used for charging. The CV charging method prevents overcharging the lithium-ion battery in the final term. Based on our experimental results, this study compares the four charging methods (PC, TC, SC, and Reflex-current) with the CC charging method to verify their improvement of the charging speed and increase in temperature in the mid-term. The charging speeds increased by 14.38%, 14.04%, 16.36%, and 27.27%, respectively, and the rise in temperature decreased by 37.8%, 40.5%, 48.6%, and 13.51%, respectively; all performed better than the CC charging method. Finally, users can adjust the charging method of the proposed DSBFC according to the needs of batteries so as to achieve excellent performance.

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A Turn-Ratio-Changing Half-Bridge CLLC DC–DC Bidirectional Battery Charger Using a GaN HEMT

Shieh

Jeng

et al. 2023

Energies

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This paper presents a 250 kHz bidirectional battery charger circuit using a GaN HEMT. The charger is subjected to a high-/low-side constant voltage at 200 V/20 V. The charger circuit is a hybrid of the LLC and flyback circuit topologies. Both the power output analysis and efficiency control of this circuit are simplified when the magnetization current is minimized using the low-resistance GaN HEMT. The switching frequency is controlled to match the series resonance in a way that is analogous to conventional LLC circuit controls, while the duty ratio that determines the power output and the dead time, which determines the zero voltage switching, is controlled in an analogous manner to the flyback circuit control. The charging and discharging modes were altered by applying a double-throw relay that changes the transformer turn ratio, which is different from conventional LLC designs using the switching frequency adjustment. A nominal turn ratio with Np = 35 and Ns = 3.5 for a 200 V/20 V converter can only produce an internal series resonance with no current flowing in any charging direction. The proposed circuit using a transformer with multiple windings (Np = 35, Ns,F = 4, and Ns,R = 3) was fabricated to deliver 125 W output power from the power grid battery to the vehicle battery in the forward (charging) mode and 90 W in the reverse (discharging) mode. The conversion efficiency was calculated to be as high as 97% in the forward mode and 95% in the reverse mode. The high conversion efficiency is due to the characteristics of the GaN HEMT, including low resistive and switching losses. The equations derived in this paper associate these losses with the series resonant frequency and power conversion rate, which highlight the advantages of using a GaN HEMT in this CLLC design.

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Analysis and Implementation of a Bidirectional Converter with Soft Switching Operation

Cited by 4 publications

References 21 publications

A Common-Ground Bidirectional Hybrid Switched-Capacitor DC–DC Converter with a High Voltage Conversion Ratio

A Common-Ground Bidirectional Hybrid Switched-Capacitor DC–DC Converter with a High Voltage Conversion Ratio

A Multifunctional, Non-Constant Current Charger Based on a Dual-Switching, Bidirectional Flyback Converter

A Turn-Ratio-Changing Half-Bridge CLLC DC–DC Bidirectional Battery Charger Using a GaN HEMT

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