• Title, Summary, Keyword: Output power regulation

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A Cross Regulation Analysis for Single-Inductor Dual-Output CCM Buck Converters

  • Wang, Yao;Xu, Jianping;Zhou, Guohua
    • Journal of Power Electronics
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    • v.16 no.5
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    • pp.1802-1812
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    • 2016
  • Cross regulation is a key technical issue of single-inductor multiple-output (SIMO) DC-DC converters. This paper investigates the cross regulation in single-inductor dual-output (SIDO) Buck converters with continuous conduction mode (CCM) operation. The expressions of the DC voltage gain, control to the output transfer function, cross regulation transfer function, cross coupled transfer function and impedance transfer function of the converter are presented by the time averaging equivalent circuit approach. A small signal model of a SIDO CCM Buck converter is built to analyze this cross regulation. The laws of cross regulation with respect to various load conditions are investigated. Simulation and experiment results verify the theoretical analysis. This study will be helpful for converter design to reduce the cross regulation. In addition, a control strategy to reduce cross regulation is performed.

Switching Power Module for a Small-Sized Electric Power Source (소형 전원용 스위칭 파워 모듈)

  • 김병철
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.5
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    • pp.1068-1073
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    • 2004
  • 5 V/500 mA transless type power module was designed by using a semiconductor switching technique for a small-sized electric power source. It used voltage drop type chopper method, and is composed of switching circuit, control circuit, voltage detect circuit, and constant voltage circuit. The switching power module which is designed in this study, showed load regulation of 0.2 V, line regulation of 0.1 V, output ripple of 85 mVp-p, switching frequency of 64.7 kHz, maximum power efficiency of 58 %, and satisfied its reliability and EMC test.

Neural Network Controller for a Permanent Magnet Generator Applied in Wind Energy Conversion System

  • Eskander, Mona N.
    • Journal of Power Electronics
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    • v.2 no.1
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    • pp.46-54
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    • 2002
  • In this paper a neural network controller for achieving maximum power tracking as well as output voltage regulation, for a wind energy conversion system (WECS) employing a permanent magnet synchronous generator is proposed. The permanent magnet generator (PMG) supplies a dc load via a bridge rectifier and two buck-boost converters. Adjusting the switching frequency of the first buck-boost converter achieves maximum power tracking. Adjusting the switching frequency of the second buck-boost converter allows output voltage regulation. The on-time of the switching devices of the two converters are supplied by the developed neural network (NN). The effect of sudden changes in wind speed and/ or in reference voltage on the performance of the NN controller are explored. Simulation results showed the possibility of achieving maximum power tracking and output voltage regulation simulation with the developed neural network controllers. The results proved also the fast response and robustness of the proposed control system.

Modified Control Scheme to Regulate the Active Power Output of Doubly Fed Induction Generator (이중여자 권선형 유도발전기의 출력조정을 위한 제어 기법)

  • Park, Young-Ho;Won, Dong-Jun;Park, Jin-Woo;Moon, Seung-Il
    • Proceedings of the KIEE Conference
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    • pp.1232-1233
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    • 2007
  • As the number of wind turbines installed increase, the power from wind energy starts to replace conventional generation units and its influence on power system can not be neglected. Because of the intermittent nature of wind resource, the output power of wind turbine fluctuates according to wind speed variation. In this point of view, it is necessary for wind turbines to be equipped with power regulation ability. The doubly fed induction generator (DFIG) is one of the main techniques used in variable speed wind turbines. This thesis focuses on the development of modified control scheme of DFIG to regulate output power. The proposed control scheme achieves active power output regulation so as to stabilize the power system.

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Analysis of Cross-Regulation Characteristics for Multi-Output LLC Resonant Converter (다중출력 LLC 공진 컨버터의 교차 조절 특성 분석)

  • Jeong, Jin-Woo;Lim, Jeong-Gyu;Kim, Jong-Hae;Oh, Dong-Seong;Chung, Se-Kyo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.4
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    • pp.281-290
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    • 2012
  • This paper describes a Cross-regulation characteristics of a multi-output LLC resonant converter widely used in consumer electronics. The output characteristics of the multi-output LLC converter is derived from the assumption that the current and voltage in the resonant network is sinusoidal and the duty loss exists. The simulation and experimental results are provided to verify the theoretic results.

Seamless Transfer of Single-Phase Utility Interactive Inverters with a Synchronized Output Regulation Strategy

  • Xiang, Ji;Ji, Feifan;Nian, Heng;Zhang, Junming;Deng, Hongqiao
    • Journal of Power Electronics
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    • v.16 no.5
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    • pp.1821-1832
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    • 2016
  • This study presents a strategy using the synchronized output regulation method (SOR) for controlling inverters operating in stand-alone and grid-connected modes. From the view point of networked dynamic systems, SOR involves nodes with outputs that are synchronized but also display a desirable wave shape. Under the SOR strategy, the inverter and grid are treated as two nodes that comprise a simple network. These two nodes work independently under the stand-alone mode. An intermediate mode, here is named the synchronization mode, is emphasized because the transition from the stand-alone mode to the grid-connected mode can be dealt as a standard SOR problem. In the grid-connected mode, the inverter operates in an independent way, in which the voltage reference changes for generalized synchronization where its output current satisfies the required power injection. Such a relatively independent design leads to a seamless transfer between operation modes. The closed-loop system is analyzed in the state space on the basis of the output regulation theory, which improves the robustness of the design. Simulations and experiments are performed to verify the proposed control strategy.

Design of an Input-Parallel Output-Parallel Multi-Module DC-DC Converter Using a Ring Communication Structure

  • Hu, Tao;Khan, Muhammad Mansoor;Xu, Kai;Zhou, Lixin;Rana, Ahmad
    • Journal of Power Electronics
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    • v.15 no.4
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    • pp.886-898
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    • 2015
  • The design feasibility of a micro unidirectional DC transmission system based on an input-parallel output-parallel (IPOP) converter is analyzed in this paper. The system consists of two subsystems: an input-parallel output-series (IPOS) subsystem to step up the DC link voltage, and an input-series output-parallel (ISOP) subsystem to step down the output voltage. The two systems are connected through a transmission line. The challenge of the delay caused by the communication in the control system is addressed by introducing a ring communication structure, and its influence on the control system is analyzed to ensure the feasibility and required performance of the converter system under practical circumstances. Simulation and experiment results are presented to verify the effectiveness of the proposed design.

Input-Output Feedback Linearizing Controller Design of a Power System Using a Modified Voltage Equation (수정한 전압방정식을 이용한 발전기의 입출력 귀환선형화 제어기 설계)

  • Kim, Seok-Kyoon;Yoon, Tae-Woong
    • Proceedings of the KIEE Conference
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    • pp.183-185
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    • 2006
  • This paper presents a SISO nonlinear controller for the power system consisting of a synchronous generator connected to an infinite bus. The proposed controller is based on input-output feedback linearization, with a modified version of the terminal voltage equation used as the output. The resulting closed-loop has no internal dynamics, and thus stability is guaranteed. The controller performance is seen to be effective through simulations.

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A High Current Efficiency CMOS LDO Regulator with Low Power Consumption and Small Output Voltage Variation

  • Rikan, Behnam Samadpoor;Abbasizadeh, Hamed;Kang, Ji-Hun;Lee, Kang-Yoon
    • Journal of IKEEE
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    • v.18 no.1
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    • pp.37-44
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    • 2014
  • In this paper we present an LDO based on an error amplifier. The designed error amplifier has a gain of 89.93dB at low frequencies. This amplifier's Bandwidth is 50.8MHz and its phase margin is $59.2^{\circ}C$. Also we proposed a BGR. This BGR has a low output variation with temperature and its PSRR at 1 KHz is -71.5dB. For a temperature variation from $-40^{\circ}C$ to $125^{\circ}C$ we have just 9.4mV variation in 3.3V LDO output. Also it is stable for a wide range of output load currents [0-200mA] and a $1{\mu}F$ output capacitor and its line regulation and especially load regulation is very small comparing other papers. The PSRR of proposed LDO is -61.16dB at 1 KHz. Also we designed it for several output voltages by using a ladder of resistors, transmission gates and a decoder. Low power consumption is the other superiority of this LDO which is just 1.55mW in full load. The circuit was designed in $0.35{\mu}m$ CMOS process.

Novel Multiple Output Converter using Quasi Load

  • Choi, Kyu-Sik;Hyun, Byeong-Chul;Lee, Seoung-Woon;Cho, Bo-Hyung
    • Proceedings of the KIPE Conference
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    • pp.125-126
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    • 2010
  • In this paper, a novel multiple output converter using quasi load is proposed. Conventional multiple output converters using multi-winding transformer has poor output voltage regulations. To solve this problem, there are many proposals like post regulation method, weighted control method, and etc. However, the post regulation method regulates output voltage tightly but its conduction loss and cost are increased. And the weighted control can achieve high efficiency and low cost but its regulation is not enough. To solve these problems, this paper proposes a novel multiple output converter using quasi load. The proposed method uses a quasi load which acts like an active dummy load for tight regulation but there is rarely increase of loss and cost. The proposed method is verified by hardware test by two output(24V and 15V) flyback type converter.

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