• Title/Summary/Keyword: digital PWM

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Attitude Control of Artificial Satellites via Intelligent Digital Redesign

  • Lee, Ho-Jae;Park, Jin-Bae;Lee, Yeun-Woo;Joo, Young-Hoon
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.1283-1288
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    • 2003
  • This paper proposes an approach to attitude control artificial satellites with jet-engine. The jet-engine produces on-off thrust, which can be modelled as pulse-width-modulated (PWM) function. Therefore, the problem is converted to design a PWM controller and we develop an efficient technique for this purpose using digital redesign. The digital redesign is a converting technique a well-designed analog controller into the equivalent digital one maintaining the property of the original analog control system in the sense of state-matching. The redesigned digital controller is again converted into PWM controller using the equivalent area principle. We show a computer simulation of the attitude control of artificial satellites.

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Digital Power IC design using VHDL and FPGA (VHDL과 FPGA를 이용한 Digital Power IC 설계)

  • Kim, Min Ho;Koo, Bon Ha;Yang, Oh
    • Journal of the Semiconductor & Display Technology
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    • v.12 no.4
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    • pp.27-32
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    • 2013
  • In this paper, the boost converter was implemented by digital control in many applications of the step-up. The PWM(pulse width modulation) control module of boost converter was digitized at power converter using the FPGA device and VHDL. The boost converter was designed to output a fixed voltage through the PI control algorithm of the PWM control module even if input voltage and output load are variable. The boost converter was digitized can be simplified by reducing the size of the module and the external control components. Thus, the digital power IC has advantageous for weight reduction and miniaturization of electronic products because it can be controlled remotely by setting the desired output voltage and PWM control module. The boost converter using the digital power IC was confirmed through experiments and the good performances were showed from experiment results.

A Comparison of the PWM/PDM Control Scheme for Single Phase Switched Reluctance Motor for Vacuum Cleaner (청소기용 단상 SRM의 PWM/PDM 운전 기법 비교 고찰에 관한 연구)

  • Lee Yohan;Kim Sangyoung;Lim Junyoung;Kim Jungchul
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.419-422
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    • 2002
  • This paper compares PDM and PWM for single phase switched reluctance motor for vacuum cleaner. Generally, PWM control scheme Is preferred because of small torque ripple compared with PDM control scheme. However, as the motor speed of the vacuum cleaner is above 20,000[rpm], the torque ripple is not problem any more. PDM control scheme is better than PWM control scheme considering loss of power device and EMI.

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A Study of PWM Inverter for Field Control on Large Synchronous Generator (대형 동기 발전기 계자제어를 위한 PWM 인버터에 관한 연구)

  • Ryu, Ho-Seon;Lee, Joo-Hyun;Lim, Ick-Hun
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.958-959
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    • 2006
  • For the life extension of Jeju thermal power plant, digital PWM excitation system was replaced by KEPRI. This system consist of TMR(Triple Modular Redundant) controller, dual PWM power inverter for field current control and MMI etc. The Performance test during the commissioning verified the reliability of digital PWM excitation system and recently, this system has been operated successfully.

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A Design of digital PWM controller for automotive brake solenoid valve (자동차 제동 솔레노이드 밸브용 디지털 PWM 컨트롤러 설계)

  • Kim, Dong-hyeon;Shin, Changsik;Seo, Jin-ho;Shin, Kyung-wook
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2014.05a
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    • pp.152-155
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    • 2014
  • This paper describes a design of digital PWM controller for automotive brake solenoid valve which is used in ABS/ESC SoC. The PWM controller which consists of 12 channels supports both direct control and PI control. Six channels in direct control mode make consistent PWM signals according to duty ratio setting, and the others in PI control mode make PWM signals with constant current depending on current setting. The PWM controller also has functions including solenoid valve open detection, Dither and PWM phase shift. The PWM controller having 44,779 gates is fabricated using a 0.18um CMOS process, and test results show that all the functions are correct.

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Study on the Implementation of the Digital Controller of High-Speed PWM Current Amplifier (디지털 제어 방식의 고속 PWM 전류 증폭기의 구현에 관한 연구)

  • Ko, Deog-Hwa;Baek, Kwang-Ryul
    • Journal of Institute of Control, Robotics and Systems
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    • v.8 no.2
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    • pp.97-103
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    • 2002
  • This paper deals with a PWM(Pulse Width Modulation) current amplifier using digital controller in order to generate a gradient magnetic field far the MRI(Magnetic Resonance Image) system. Because of tolerance of discrete devices, it is difficult to set accurate values of the control parameters and to make an analog-controlling circuit. However, using digital controller, it is possible to set exact control parameters and to adopt a modern control techniques. It is shown that the digital controller will highly enhance the output current response and it will improve the quality of the MRI.

Direct Digital Control of Single-Phase AC/DC PWM Converter System

  • Kim, Young-Chol;Jin, Lihua;Lee, Jin-Mok;Choi, Jae-Ho
    • Journal of Power Electronics
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    • v.10 no.5
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    • pp.518-527
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    • 2010
  • This paper presents a new technique for directly designing a linear digital controller for a single-phase pulse width modulation (PWM) converter systems, based on closed-loop identification. The design procedure consists of three steps. First, obtain a digital current controller for the inner loop system by using the error space approach, so that the power factor of the supply is close to one. The outer loop is composed of a voltage controller, a current control loop including a current controller, a PWM converter, and a capacitor. Then, all the components, except the voltage controller, are identified by a discrete-time equivalent linear model, using the closed-loop output error (CLOE) method. Based on this equivalent model, a proper digital voltage controller is then directly designed. It is shown through PSim simulations and experimental results that the proposed method is useful for the practical design of PWM converter controllers.

PWM Inverter Controller Design for UPS(Uninterruptible Power Supply) Using a DSP(TMS320F240) (DSP(TMS320F240)을 이용한 무정전 전원장치(UPS)용 PWM 인버터 제어기 설계)

  • Jang, J.Y.;Lee, J.P.;Choi, J.Y.;Choy, I.;Lee, S.C.;Yoo, J.Y.
    • Proceedings of the KIEE Conference
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    • 1999.07f
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    • pp.2587-2589
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    • 1999
  • In this paper, we propose a new control scheme for a PWM inverter using digital control. Digital control has various advantages in comparison with conventional analogue control. It can achieve high frequency switching of inverter and can be little influenced for temperature variations and aging of devices. This digitally-controlled PWM inverter is implemented using a Digital Signal Processor(DSPTMS320F240). The simulation results are given to verify the DSP based PWM inverter design and implementation.

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Digital-To-Phase-Shift PWM Circuit for High Power ZVS FB DC/DC Converter (대용량 ZVS FB DC/DC 컨버터에 있어서 Digital-To-Phase Shift PWM 발생회로)

  • 김은수;김태진;최해영;박순구;김윤호;이재학
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.618-621
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    • 1999
  • With the advent of the high-speed microprocessor and DSP, the possibility of executing a control strategy in digital domain has become a reality. By the use of the DSP and microprocessor controller, many high power drive system may be enhanced resulting in the improved robustness to EMI, the ability to communicate the operating conditions and the ease of adjusting the control parameters. But, the digital controller using DSP or microprocessor is not applied in the high frequency switching power supplies, especially full bridge DC/DC converter. So, this paper presents the method and realization of designing a digital-to-phase shift PWM circuit for full digital controlled full bridge DC/DC converter with zero voltage switching. The operating principles, simulation and experimental results will be presented.

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New Technique to Generate the PWM Signal

  • Pongswatd, Sawai;Masuchun, Ruedee;Smerpitak, Krit;Ukakimapurn, Prapart
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.252-255
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    • 2004
  • This paper presents a new technique to generate the 1-bit signal by decoding Pulse Width Modulation (PWM) signal to a binary file before programming onto the ROM. Since each PWM signal requires only 1-bit digital signal, PWM signal and other forms of digital signal related to multi-bit can be simply generated. The results demonstrate that using this new technique to generate the PWM signal can simplify the process and hardware complication. Moreover, the signal's data and frequency can be easily modified by programming the data onto the ROM and using the counter, respectively, which can reduce the size of the circuit and make the PCB easier.

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