• Title, Summary, Keyword: power converter

Search Result 5,927, Processing Time 0.047 seconds

Direct Single-stage Power Converter with Power Factor Improvement for Switched Mode Power Supply

  • Kalpana, R.;Singh, Bhim;Bhuvaneswari, G.
    • Journal of Electrical Engineering and Technology
    • /
    • v.5 no.3
    • /
    • pp.468-476
    • /
    • 2010
  • This paper presents a direct single-stage power converter using single-phase isolated full-bridge converter modules, with inherent power factor correction (PFC) for a 12 kW switched mode power supply (SMPS). The advantages of the proposed converter are its simple control strategy, reduction in number of conversion stage, low input line current harmonics, and improvement in power factor. Analysis of the single-stage converter is carried out in continuous conduction mode of operation. Steady-state analysis of the proposed converter is conducted to obtain converter parameters. A systematic design procedure is also presented for a 12k W converter with a design example. The effect of load variation on SMPS is also studied in order to demonstrate the effectiveness of the proposed converter for the complete range of load conditions. A set of power quality indices on input ac mains for an SMPS fed from a single-stage converter is also presented for easy comparison of their performance.

Development of Wireless Power Transceiver with Bi-directional DC-DC Converter (양방향으로 동작하는 DC-DC Converter를 이용하는 무선 전력 송수신기 개발)

  • Moon, Young-Jin;Yoo, Changsik
    • Journal of the Institute of Electronics and Information Engineers
    • /
    • v.51 no.7
    • /
    • pp.111-121
    • /
    • 2014
  • A bi-directional DC-DC converter has been developed for a wireless power transceiver which enables a device to receive and transmit power wireless. Generally, the wireless power transceiver requires two DC-DC covnerter and two external inductors. However, the proposed wireless power transceiver requires only one DC-DC converter and one inductor, allowing small form-factor. The bi-directional DC-DC converter implemented in $0.35{\mu}m$ BCDMOS process operates as a buck converter at the wireless power receiving mode and the power efficiency is 91% when the ouput power is 3W. In the wireless power transmitter mode, the DC-DC converter operates as a boost converter. With the bi-directional DC-DC converter and the proposed efficiency maximizing techniques, the power efficiency of wireless power transceiver is 81.7% in receiver mode and 76.5% in transmitter mode.

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
    • /
    • v.20 no.9
    • /
    • pp.1763-1770
    • /
    • 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.

Simple Structure LED-Driving Power Converter with High Power Factor (높은 역률을 가지는 단순 구조 LED 구동 전력컨버터)

  • Jeong, Gang-Youl
    • Journal of IKEEE
    • /
    • v.22 no.3
    • /
    • pp.767-773
    • /
    • 2018
  • This paper proposes the simple structure LED-driving power converter with high power factor. As the proposed power converter combines the PFC boost converter and the conventional flyback converter into only one power conversion circuit, it simplifies the structure of LED-driving power converter. Thus the proposed converter is controlled using only one PWM controller IC, and it achieves high power factor, constant output voltage/current and cost-effectiveness. Therefore the proposed converter is suitable for the industry production and utilization of LED-light-system. In this paper, the operation analysis and design example of the proposed converter are explained, briefly. Also experimental results of the prototype that is implemented based on the designed circuit parameters are shown to validate operation characteristics of the proposed converter.

Design and Analysis of Universal Power Converter for Hybrid Solar and Thermoelectric Generators

  • Sathiyanathan, M.;Jaganathan, S.;Josephine, R.L.
    • Journal of Power Electronics
    • /
    • v.19 no.1
    • /
    • pp.220-233
    • /
    • 2019
  • This work aims to study and analyze the various operating modes of universal power converter which is powered by solar and thermoelectric generators. The proposed converter is operated in a DC-DC (buck or boost mode) and DC-AC (single phase) inverter with high efficiency. DC power sources, such as solar photovoltaic (SPV) panels, thermoelectric generators (TEGs), and Li-ion battery, are selected as input to the proposed converter according to the nominal output voltage available/generated by these sources. The mode of selection and output power regulation are achieved via control of the metal-oxide semiconductor field-effect transistor (MOSFET) switches in the converter through the modified stepped perturb and observe (MSPO) algorithm. The MSPO duty cycle control algorithm effectively converts the unregulated DC power from the SPV/TEG into regulated DC for storing energy in a Li-ion battery or directly driving a DC load. In this work, the proposed power sources and converter are mathematically modelled using the Scilab-Xcos Simulink tool. The hardware prototype is designed for 200 W rating with a dsPIC30F4011 digital controller. The various output parameters, such as voltage ripple, current ripple, switching losses, and converter efficiency, are analyzed, and the proposed converter with a control circuit operates the converter closely at 97% efficiency.

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

  • Yang, Lung-Sheng;Lin, Chia-Ching
    • Journal of Power Electronics
    • /
    • v.15 no.6
    • /
    • pp.1438-1445
    • /
    • 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.

The Operation Characteristics of Dual-mode Power Converter for DC Reactor Type Superconducting Fault Current Limiter (DC 리액터형 고온초전도한류기를 위한 전력변환기의 dual-mode 운전특성)

  • 전우용;이승제;안민철;이안수;윤용수;윤경용;고태국
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
    • /
    • /
    • pp.43-46
    • /
    • 2003
  • The dc reactor type high-Tc superconducting fault current limiter(SFCL) is composed of three parts, a power converter, a magnetic core reactor(MCR) and a dc reactor. This study concerned with the power converter of the DC reactor type high-Tc SFCL. The rectifying devices which power converter of 6.6kV/200A SFCL consists of have to endure high voltage. We propose the dual mode power converter to reduce the voltage which each rectifying device endures. In the single phase the experiment and simulation of dual mode power converter and the simulation of power converter with one bridge rectifier are performed. The current of each system with different power converter has a same tendency and the voltage which rectifying device of dual mode power converter endures is reduced in half by comparison with that of power converter with one bridge rectifier. We found dual mode power converter can be applied to SFCL.

  • PDF

Analysis of an AC/DC Resonant Pulse Power Converter for Energy Harvesting Using a Micro Piezoelectric Device

  • Chung Gyo-Bum;Ngo Khai D.T.
    • Journal of Power Electronics
    • /
    • v.5 no.4
    • /
    • pp.247-256
    • /
    • 2005
  • In order to harvest power in an efficient manner from a micro piezoelectric (PZT) device for charging the battery of a remote system, a new AC/DC resonant pulse power converter is proposed. The proposed power converter has two stages in the power conversion process. The first stage includes N-type MOSFET full bridge rectifier. The second stage includes a boost converter having an N-type MOSFET and a P-type MOSFET. MOSFETs work in the $1^{st}$ or $3^{rd}$ quadrant region. A small inductor for the boost converter is assigned in order to make the size of the power converter as small as possible, which makes the on-interval of the MOSFET switch of the boost converter ultimately short. Due to this short on-interval, the parasitic junction capacitances of MOSFETs affect the performance of the power converter system. In this paper, the performance of the new converter is analytically and experimentally evaluated with consideration of the parasitic capacitance of switching devices.

Single Power-conversion AC-DC Converter with High Power Factor (고역률을 갖는 단일 전력변환 AC-DC 컨버터)

  • Cho, Yong-Won;Park, Chun-Yoon;Kwon, Bong-Hwan
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.19 no.1
    • /
    • pp.23-30
    • /
    • 2014
  • This paper proposes a single power-conversion ac-dc converter with a dc-link capacitor-less and high power factor. The proposed converter is derived by integrating a full-bridge diode rectifier and a series-resonant active-clamp dc-dc converter. To obtain a high power factor without a power factor correction circuit, this paper proposes a suitable control algorithm for the proposed converter. The proposed converter provides single power-conversion by using the proposed control algorithm for both power factor correction and output control. Also, the active-clamp circuit clamps the surge voltage of switches and recycles the energy stored in the leakage inductance of the transformer. Moreover, it provides zero-voltage turn-on switching of the switches. Also, a series-resonant circuit of the output-voltage doubler removes the reverse-recovery problem of the output diodes. The proposed converter provides maximum power factor of 0.995 and maximum efficiency of 95.1% at the full-load. The operation principle of the converter is analyzed and verified. Experimental results for a 400W ac-dc converter at a constant switching frequency of 50kHz are obtained to show the performance of the proposed converter.

A winding design of Tap Level Converter (Tap Level 제어 전력 변환기의 권선설계)

  • Chun J.H.;Lee H.W.
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.53-55
    • /
    • 2006
  • In this paper discusses winding methode of single phase AC-DC reversible power converter The reversible power converter driven by multi Tap winding at both side switching control. It has a advantage that simple drive of main switching device. and obtain load current of good quality without filter circuit and free from noise or isolation for lower switching frequency. In this research, study on current type converter and inverter circuit that consist for possibility of AC-DC/DC-AC multi-level reversible converter.

  • PDF