• Title/Summary/Keyword: 전력조절기(power regulator)

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Critical Conduction Mode BOOST Type Solar Array Regulator (임계모드 부스트형 태양전력 조절기)

  • Yang, JeongHwan;Ryu, SangBurm;Yun, SeokTeak
    • Journal of Satellite, Information and Communications
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    • v.9 no.3
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    • pp.86-90
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    • 2014
  • A DC-DC Converter operates in CCM(Continuous Coundcution Mode), DCM(Discontinuous Conduction Mode), CRM(Critical Conduction Mode). The CRM is boundary between CCM and DCM. If a DC-DC converter is designed to operate in CRM, its inductor volume can decrease and power loss which caused by switch and diode can decrease. In this paper, the DC-DC converter which operates in CRM is applied to a solar array regulator(SAR) for the satellite. The switching frequency of the CRM boost SAR changes according to input and output condition. The switching frequency limit logic is applied to limit the maximum switching frequency. Meanwhile, the small signal transfer function of the CRM boost SAR is simple, so the controller design is also simple. In this paper, the small signal transfer function from control reference to solar array voltage is induced. And the voltage controller is designed based on the small signal transfer function. Finally, the CRM boost SAR is verified by simulation.

Stable Standby-mode Implementation of Multi-output Power Supply using a New Load Current Estimation Technique with Linear Regulator (다중 출력 전원공급장치의 안정적 대기전력 구현을 위한 새로운 방식의 부하전류 측정기법 구현)

  • Lee, Jong-Hyun;Jung, An-Yeol;Kim, Dong-Joon;Park, Joung-Hu;Jeon, Hee-Jong
    • The Transactions of the Korean Institute of Power Electronics
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    • v.16 no.1
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    • pp.88-95
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    • 2011
  • In this paper, a new standby-mode control method for multiple output switching-mode power-supply is suggested, which uses the control signal of the feedback compensator of the inner loop in the linear voltage regulator located at the transformer secondary side, as the load current information. Conventional method has a problem that standby mode occurs depending only on the load condition of the main controller output, which makes the other secondary side output very inaccurate by burst mode operation. The proposed method detects all the load current information and operates in burst mode only when the all of them are light load condition. Minimum of the additional components are required for the implementation of the proposed method because the load information is obtained from the existing feedback circuit of the post-stage linear regulator. In this paper, the operating principles of the proposed standby-mode circuit are presented with an numerical analysis, and are verified by 25W hardware prototype implementation.

A Design of Solar Array Regulator for LEO Satellites (저궤도 인공위성용 태양전력 조절기 설계)

  • Park, Heesung;Cha, Hanju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.10
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    • pp.1432-1439
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    • 2015
  • The solar array regulator supplies the electric power to the battery and the other units of a satellite by controlling the operating point of a solar array. In this paper, the solar array regulator composed with analog circuits is proposed. The solar array regulator has three modes. The first is a maximum power point tracking mode for harvesting the maximum photovoltaic power generation. The second is a power limitation mode which is designed for optimizing the volume and weight of the solar array regulator by preventing the excessive power conversion. The last constant voltage mode is proposed to keep the Li-Ion battery is not over-charge. The small signal model of the solar array regulator which has the reversed input and output variables in comparison with conventional converter is established and the stability is analysed. Finally, the proposed design of the solar array regulator is verified by experiments.

Implementation of a Power Simulator for Energy Balance Analysis of a LEO Satellite (저궤도 위성의 에너지 균형 분석을 위한 전력 시뮬레이터의 구현)

  • Jeon, Moon-Jin;Lee, Na-Young;Kim, Day-Young;Kim, Gyu-Sun
    • Aerospace Engineering and Technology
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    • v.9 no.2
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    • pp.176-184
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    • 2010
  • The power simulator for a LEO satellite is a useful tool to analyze mission validity and energy balance for various mission scenarios by estimating power generation, power consumption, depth of discharge, bus voltage, charging/discharging current, etc. In this paper, it is described the calculation algorithm of the solar array (SA) power, the satellite load power and the battery modeling method to develop a satellite power simulation. To simulate the SA power generation, three different operation modes (DET, MPPT, CV) of SAR (Solar Array Regulator) are considered with a SA model. The satellite load power is estimated using the satellite unit power database, the unit on/off configuration at some satellite operation modes. The bus voltage and battery charging/discharging current at the specific DoD (Depth of Discharge) are calculated based on the battery characteristics. By this satellite power simulator, it can be conveniently analyzed the energy balance and the validity of a planned mission of a LEO satellite.

DCM Analysis of Solar Array Regulator for LEO Satellites (저궤도 인공위성용 태양전력 조절기의 전류 불연속 모드 해석)

  • Park, Heesung;Cha, Hanju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.4
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    • pp.593-600
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    • 2016
  • The solar array regulator for low earth orbit satellites controls a operating point of solar array for suppling electric power to the battery and the other units. Because the control object is reversed, the new approach for large and small signal analysis is needed despite using buck-converter for power stage. In this paper, the steady state analysis of solar array regulator is performed in continuous conduction mode and discontinuous conduction mode, and the border condition for each mode is established. Also, the small signal model of solar array regulator is established in discontinuous conduction mode. Experiments are carried on in worst condition which the solar array regulator can face with discontinuous conduction mode. The results show that the solar array regulator is in stable.

Development and Validation of HAUSAT-2 Nanosatellite EPS (HAUSAT-2 위성의 전력계 개발 및 검증)

  • Kim, Dong-Un;Jang, Yeong-Geun;Mun, Byeong-Yeong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.4
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    • pp.89-101
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    • 2006
  • This paper addresses Electrical Power Subsystem(EPS) design and verification of HAUSAT-2 small satellite through energy balance analysis(EBA) depending on individual operation modes. GaAs solar cells are used for satellite power generation and digital peak power tracking is implemented for EPS architecture. One battery pack is consisted of 4 Li-Ion cells. Battery charge is accomplished by peak power tracker and battery charge regulator. Power conditioning assembly uses three DC-DC converters, and power distribution assembly which consists of commercial IC and MOSFET switch distributes power to subsystems and payloads. The altitude of 650km and sun-synchronous LEO with various local time ascending node(LTAN) are considered in EBA.

Study on the Modularization of Power Bus Regulator for LEO Satellites (저궤도 위성의 전력조절기 모듈화에 대한 연구)

  • Park, Sung-Woo;Park, Hee-Sung;Jang, Jin-Baek;Jang, Sung-Soo;Lee, Jong-In;Kim, Hak-Jung
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.897-898
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    • 2006
  • This paper proposes a new power-stage circuit that can be available for modularization of the power regulator which is used at the software-controlled unregulated bus system. And we analyze the proposed power-stage operation according to its operating modes and verify it by performing software simulation and hardware experiment using prototype. By constructing a parallel-module converter which is composed of proposed power-stages, we verify the operations and usefulness of the proposed power-stage.

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A Study on the Utilization and Control Method of Hybrid Switching Tap Based Automatic Voltage Regulator on Smart Grid (스마트그리드의 탭 전환 자동 전압 조정기의 다중 스위칭 제어 방법 및 활용 방안에 관한 연구)

  • Park, Gwang-Yun;Kim, Jung-Ryul;Kim, Byung-Gi
    • Journal of the Korea Society of Computer and Information
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    • v.17 no.12
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    • pp.31-39
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    • 2012
  • In this paper, we propose a microprocessor-based automatic voltage regulator(AVR) to reduce consumers' electric energy consumption and to help controlling peak demanding power. Hybrid Switching Automatic Voltage Regulator (HS-AVR) consist of a toroidal core, several tap control switches, display and command control parts. The coil forms an autotransformer which has a serial main winding and four parallel auxiliary windings. It controls the output voltage by changing the combination of the coils and the switches. Relays are adopted as the link switches of the coils to minimize the loss. To make connecting and disconnecting time accurate, relays of the circuit have parallel TRIACs. A software phase locked loop(PLL) has been used to synchronize the timings of the switches to the voltage waveform. The software PLL informs the input voltage zero-crossing and positive/negative peak timing. The traditional voltage transformers and AVRs have a disadvantage of having a large mandatory capacity to accommodate maximum inrush current to avoid the switch contact damage. But we propose a suitable AVR for every purpose in smart grid with reduced size and increased efficiency.

A Simplified Series-Parallel Structure for the RPPT (Regulated Peak Power Tracking) system (저궤도 인공위성용 Regulated Peak Power Tracking(RPPT) 시스템을 위한 단순화된 직-병렬 구조)

  • Yang, Jeong-Hwan;Bae, Hyun-Su;Lee, Jea-Ho;Cho, Bo-Hyung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.13 no.2
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    • pp.110-118
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    • 2008
  • The regulated peak power tracking (RPPT) systems such as the series structure and the parallel structure are commonly used in the satellite space power system. However, this structure processes the solar array power to the load through two regulators during one orbit cycle, which reduces the energy transfer efficiency. The series-parallel structure for the RPPT system can improve the power conversion efficiency, but an additional regulator increases the cost, size and weight of the system. In this paper, a simplified series-parallel space power system that consists of two regulators is proposed. The proposed system has the similar energy transfer efficiency with the series-parallel structure by adding one switch to the series structure, which reduces the cost, size and the weight. The large signal stability analyses is provided to understand the four main modes of system operation. In order to compare the energy efficiency with a series structure, the simulation is performed. The experimental verifications are performed using a prototype hardware with TMS320F2812 DSP and 200W solar arrays.

COMS(Communication, Ocean color & Meteorological Satellite) Meteorological Imager Interface Unit(MI2U) Design (통신해양기상위성의 기상 탑재체 접속장치 설계)

  • Chae, Tae-Byeong
    • Journal of Satellite, Information and Communications
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    • v.1 no.2
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    • pp.38-44
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    • 2006
  • The COMS(Communication, Ocean & Meteorological Satellite) is the geostationary satellite which will be performing three main objectives such as meteorological service, ocean monitoring and Ka-band satellite communications. In order to accomplish these missions, the COMS system needs to implement a specific electrical/mechanical interface functions which are requested by each payload units. This paper describes a on-board interface hardware design for COMS Meteorological Imager(MI). The Meteorological Imager Interface Unit(MI2U) achieves, through MIL-STD-15533 system bus, the interface between the Spacecraft Computer Unit(SCU) and the instrument which is dedicated to MI. MI2U provides a necessary power input to MI from +50V Power Supply Regulator(PSR), and allows adaptation of the specific payload interfaces and protocol to COMS spacecraft.

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