• Title, Summary, Keyword: Hybrid converter

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Hybrid DC-DC Converter For Power Efficiency Improvement Operating Over a Wide Load Power (넓은 부하전력에서 동작하는 전력 효율 향상을 위한 하이브리드 DC-DC 컨버터)

  • Woo, Ki-Chan;Mok, Jin-Won;Kim, Tae-Woo;Hwang, Seon-Kwang;Yang, Byung-Do
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.9
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    • pp.1763-1770
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    • 2016
  • This paper proposed hybrid converter to operate over a wide output load power. The switched-capacitor converter has a high efficiency at low load power and a low efficiency at high load power. On the contrary, the buck converter has a high efficiency at high load power and a low efficiency at low load power. The proposed hybrid converter has combination of the switched-capacitor converter and the buck converter. The switched-capacitor operates at low load power and buck converter operates at high load power, so that the hybrid converter is improved power efficiency at wide output load power. The hybrid converter was implemented with a $0.18{\mu}m$ CMOS process. The hybrid converter has a range of the load power between $50{\mu}W$and 100mW. The maximum power efficiencies are 93% and 77% at the buck converter and the switched-capacitor converter, respectively.

Novel Hybrid Converter for the On-Board Charger of Electric Vehicle (전기자동차용 온보드 충전기를 위한 새로운 하이브리드 컨버터)

  • Vu, Hai-Nam;Tran, Dai-Duong;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • pp.52-53
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    • 2015
  • This paper introduces a novel hybrid converter combining a full-bridge soft switching converter and a full-bridge LLC converter. In this topology all the primary switches can achieve ZVS and ZCS all over the operation range. An additional switch and a diode are added in the secondary side of full-bridge converter to eliminate the circulating current and to provide a separate freewheeling path. The hybrid structure makes it possible to deliver the power to the secondary all the time of operation, thereby improving the efficiency. The proposed topology is suitable for the applications such as on-board chargers for electric vehicles and high power dc-dc converters. A 6.6-kW prototype converter was implemented and 97.5% efficiency was obtained through the experiments.

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Hybrid ZVS Converter with a Wide ZVS Range and a Low Circulating Current

  • Lin, Bor-Ren;Chen, Jia-Sheng
    • Journal of Power Electronics
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    • v.15 no.3
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    • pp.652-659
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    • 2015
  • This paper presents a new hybrid soft switching dc-dc converter with a low circulating current and high circuit efficiency. The proposed hybrid converter includes two sub-converters sharing two power switches. One is a three-level PWM converter and the other is a LLC converter. The LLC converter and the three-level converter share the lagging-leg switches and extend the zero-voltage switching (ZVS) range of the lagging-leg switches from nearly zero to full load since the LLC converter can be operated at fsw (switching frequency) $\approx$ fr (series resonant frequency). A passive snubber is used on the secondary side of the three-level converter to decrease the circulating current on the primary side, especially at high input voltage and full load conditions. Thus, the conduction losses due to the circulating current are reduced. The output sides of the two converters are connected in series. Energy can be transferred from the input voltage to the output load within the whole switching period. Finally, the effectiveness of the proposed converter is verified by experiments with a 1.44kW prototype circuit.

Analysis and Implementation of a DC-DC Converter for Hybrid Power Supplies Systems

  • Yang, Lung-Sheng;Lin, Chia-Ching
    • Journal of Power Electronics
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    • v.15 no.6
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    • pp.1438-1445
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    • 2015
  • A new DC-DC power converter is researched for renewable energy and battery hybrid power supplies systems in this paper. At the charging mode, a renewable energy source provides energy to charge a battery via the proposed converter. The operating principle of the proposed converter is the same as the conventional DC-DC buck converter. At the discharging mode, the battery releases its energy to the DC bus via the proposed converter. The proposed converter is a non-isolated high step-up DC-DC converter. The coupled-inductor technique is used to achieve a high step-up voltage gain by adjusting the turns ratio. Moreover, the leakage-inductor energies of the primary and secondary windings can be recycled. Thus, the conversion efficiency can be improved. Therefore, only one power converter is utilized at the charging or discharging modes. Finally, a prototype circuit is implemented to verify the performance of the proposed converter.

Hybrid Three-Level DC/DC Converter using an Energy Recovery Snubber (에너지회생스너버를 적용한 하이브리드 3레벨 DC/DC 컨버터)

  • Heo, Ye-Chang;Joo, Jong-Seong;Harerimana, Elysee-Malon;Kim, Eun-Soo;Kang, Cheol-Ha;Lee, Seung-Min
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.1
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    • pp.36-43
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    • 2017
  • This paper describes a hybrid multi-output three-level DC/DC converter suitable for a wide, high-input voltage range of an auxiliary power supply for a high-power photovoltaic generating system. In a high-power photovoltaic generating system, the solar panel output voltage depends on solar radiation quantity and varies from 450Vdc to 1100Vdc. The proposed hybrid multi-output three-level DC/DC converter, which is an auxiliary power supply, would be used as power source for control printed circuit boards and relay and cooling fans in a high-power photovoltaic generating system. The proposed multi-output ($24V_{DC}/30A$, $230V_{DC}/5A$) hybrid three-level boost converter, which uses an energy recovery snubber, is controlled by variable-frequency and phase-shifted modulations and can achieve zero-voltage switching with all operating conditions of input voltage and load range. Experimental results of a 2kW prototype are evaluated and implemented to verify the performance of the proposed converter.

Grid-tied Power Converter for Battery Energy Storage Composed of 2-stage DC-DC Converter

  • Kim, Do-Hyun;Lee, Yoon-Seok;Han, Byung-Moon;Kim, Ju-Yong;Chae, Woo-Kyu
    • Journal of Electrical Engineering and Technology
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    • v.8 no.6
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    • pp.1400-1408
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    • 2013
  • This paper proposes a new grid-tied power converter for battery energy storage, which is composed of a 2-stage DC-DC converter and a PWM inverter. The 2-stage DC-DC converter is composed of an LLC resonant converter connected in cascade with a 2-quadrant hybrid-switching chopper. The LLC resonant converter operates in constant duty ratio, while the 2-quadrant hybrid-switching chopper operates in variable duty ratio for voltage regulation. The operation of proposed system was verified through computer simulations. Based on computer simulations, a hardware prototype was built and tested to confirm the technical feasibility of proposed system. The proposed system could have relatively higher efficiency and smaller size than the existing system.

Analysis of Hybrid Converter with Wide Voltage Range Operation

  • Lin, Bor-Ren
    • Journal of Power Electronics
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    • v.19 no.5
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    • pp.1099-1107
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    • 2019
  • A soft switching converter with wide voltage range operation is investigated in this paper. A series resonant converter is implemented to achieve a high circuit efficiency with soft switching characteristics on power switches and rectifier diodes. To improve the weakness of the narrow voltage range in LLC converters, an alternating current (ac) power switch is used on the primary side to select a half-bridge or full-bridge resonant circuit to implement 4:1 voltage range operation. On the secondary-side, another ac power switch is adopted to select a full-wave rectifier or voltage-doubler rectifier to achiever an additional 2:1 output voltage range. Therefore, the proposed resonant converter has the capacity for 8:1 (320V~40V) wide output voltage operation. A single-stage hybrid resonant converter is employed in the study circuit instead of a two-stage dc converter to achiever wide voltage range operation. As a result, the study converter has better converter efficiency. The theoretical analysis and circuit characteristics are verified by experiments with a prototype circuit.

Comparison and Analysis of Boost Converter Topologies for the DC/DC Converter in Hydrogen Fuel Cell Hybrid Railway Vehicle (수소연료전지 하이브리드 철도차량용 DC/DC 컨버터를 위한 부스트 컨버터 토폴로지 비교 및 분석)

  • Kang, Dong-Hun;Lee, Il-Oun;Lee, Woo-Seok;Yun, Duk-Hyeon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.25 no.4
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    • pp.269-278
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    • 2020
  • In this paper, two types of DC/DC converters in a hydrogen fuel cell hybrid railway vehicle system, which serve to charge high-voltage battery and supply power to an inverter for driving a driving motor, were compared and analyzed. A two-level interleaving boost converter and a three-level boost converter were compared and analyzed, and a theoretical design method was proposed to have an efficiency characteristic of over 95%. In addition, a digital controller design method considering the digital phase delay component of DSP (TMS320F28335) is presented. Finally, the validity of the theoretical design of the converter with 20kW power was verified through static and dynamic experiments respectively.

A Novel Hybrid Converter with Wide Range of Soft-Switching and No Circulating Current for On-Board Chargers of Electric Vehicles

  • Tran, Van-Long;Tran, Dai-Duong;Doan, Van-Tuan;Kim, Ki-Young;Choi, Woojin
    • Journal of Electrical Engineering and Technology
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    • v.13 no.1
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    • pp.143-151
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    • 2018
  • In this paper, a novel hybrid configuration combining a phase-shift full-bridge (PSFB) and a half-bridge resonant LLC converter is proposed for the On-Board Charger of Electric Vehicles (EVs). In the proposed converter, the PSFB converter shares the lagging-leg switches with half-bridge resonant converter to achieve the wide ZVS range for the switches and to improve the efficiency. The output voltage is modulated by the effective-duty-cycle of the PSFB converter. The proposed converter employs an active reset circuit composed of an active switch and a diode for the transformer which makes it possible to achieve zero circulating current and the soft switching characteristic of the primary switches and rectifier diodes regardless of the load, thereby making the converter highly efficient and eliminating the reverse recovery problem of the diodes. In addition an optimal power sharing strategy is proposed to meet the specification of the charger and to optimize the efficiency of the converter. The operation principle the proposed converter and design considerations for high efficiency are presented. A 6.6 kW prototype converter is fabricated and tested to evaluate its performance at different conditions. The peak efficiency achieved with the proposed converter is 97.7%.

A 10kW Hybrid Converter for the Electric Vehicle Charge Application (전기자동차 충전기용 10kW 하이브리드 컨버터)

  • Tran, Dai-Duong;Yu, Sun-Ho;Vu, Hai-Nam;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • pp.319-320
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    • 2015
  • A hybrid converter for the on-board charger consisting of a soft switching full bridge (SSFB) and a half bridge (HB) LLC resonant converter is proposed. The proposed topology adopts an additional switch and a diode at the secondary side of SSFB converter to guarantee the wide ZVS range of primary side switches and to eliminate the circulating current. The output voltage is regulated by controlling the duty cycle of secondary side switch. The effectiveness of the proposed converter was experimentally verified using a 10-kW prototype circuit. The experimental results show 96.8% peak efficiency.

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