• Title/Summary/Keyword: Pulse Width Modulation (PWM)

Search Result 717, Processing Time 0.026 seconds

A Temperature Stable PWM Controller Using Bandgap Reference Voltage (밴드갭 기준전압을 이용한 동작온도에 무관한 PWM 컨트롤러)

  • Choi, Jin-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.11 no.8
    • /
    • pp.1552-1557
    • /
    • 2007
  • In this work, temperature stable pulse width modulation controller using bandgap reference voltage is proposed. Two bandgap reference voltages are designed by using BiCMOS technology which are temperature dependent and independent voltage references. PWM controller is designed by using 3.3 volt supply voltage and the output frequency is 1MHz. From simulation results, the variation of output pulse width is less than form +0.86% to -0.38% in the temperature range $0^{\circ}C\;to\;70^{\circ}C$.

A Study on The PWM Control of Resonant Inverters (공진형 인버터의 PWM 제어에 관한 연구)

  • Shin, Jae-Hwa;Cho, Kyu-Min;Kim, Young-Seok
    • Journal of the Institute of Electronics Engineers of Korea SC
    • /
    • v.38 no.1
    • /
    • pp.53-60
    • /
    • 2001
  • In many applications of power electronics, high frequency resonant inverters are used, and the PAM(Pulse Amplitude Modulation), PFM(Pulse Frequency Modulation) or PWM(Pulse Width Modulation) techniques are used to control the output power of resonant inverters. And the resonant inverters have to control the output frequency for the reliable operation under the variable load conditions. In this paper, a new switching scheme is proposed as a PWM control of resonant inverters. With the proposed method, it can be obtained that optimum resonant frequency and unity output displacement factor under the variable resonant frequency adaptively. The detail algorithm or the proposed PWM switching scheme and its output characteristics are discussed. And the veridity of the proposed method is confirmed with the experimental results.

  • PDF

A Novel Pulse-Width and Amplitude Modulation (PWAM) Control Strategy for Power Converters

  • Ghoreishy, Hoda;Varjani, Ali Yazdian;Farhangi, Shahrokh;Mohamadian, Mustafa
    • Journal of Power Electronics
    • /
    • v.10 no.4
    • /
    • pp.374-381
    • /
    • 2010
  • Typical power electronic converters employ only pulse width modulation (PWM) to generate specific switching patterns. In this paper, a novel control strategy combining both pulse-width and amplitude modulation strategies (PWAM) has been proposed for power converters. The Pulse Amplitude Modulation (PAM), used in communication systems, has been applied to power electronic converters. This increases the degrees of freedom in eliminating or mitigating harmonics when compared to the conventional PWM strategies. The role of PAM in the novel PWAM strategy is based on the control of the converter's dc sources values. Software implementation of the conventional PWM and the PWAM control strategies has been applied to a five-level inverter for mitigating selective harmonics. Results show the superiority of the proposed strategy from the THD point of view along with a reduction in the inverter power dissipation.

Hybrid Pulse Width Modulation Strategy for Wide Speed Range in IPMSM with Low Cost Drives

  • Ahn, Han-woong;Go, Sung-chul;Lee, Ju
    • Journal of Electrical Engineering and Technology
    • /
    • v.11 no.3
    • /
    • pp.670-674
    • /
    • 2016
  • The control performance of hybrid PWM inverter using a phase current measurement is presented in this paper. The hybrid PWM technique consists of space vector pulse width modulation (SVPWM) and six-step voltage control operation. The SVPWM is performed to reduce the harmonic components in the low speed region, and the six-step modulation is applied to increase the maximum speed of the IPMSM in the high speed region. Therefore, it is possible to obtain a great performance in both the low speed range and high speed range. However, the six-step modulation cannot be completely implemented, since the inverter that includes the lag-shunt sensing method has an immeasurable current region. In this paper, a quasi-six-step modulation using a modified voltage vector is proposed. The validity and usefulness of the proposed PWM technique is verified by MATLAB/Simulink and experimental results.

Direct Duty Ratio Pulse Width Modulation Method for Matrix Converters

  • Li, Yulong;Choi, Nam-Sup;Han, Byung-Moon;Kim, Kyoung-Min;Lee, Buhm;Park, Jun-Hyub
    • International Journal of Control, Automation, and Systems
    • /
    • v.6 no.5
    • /
    • pp.660-669
    • /
    • 2008
  • This paper presents a new carrier based pulse-width modulation (PWM) method for matrix converters. By using the concept of average over one switching period, the modulation algorithm and the required equations are derived to synthesize the desired output voltage and to achieve the controlled input power factor. The proposed method uses a continuous carrier and the predetermined duty ratio signals to directly generate the gating signals and, thus, is referred to as "direct duty ratio PWM (DDPWM)". The feasibility and validity of the proposed method were verified by simulation and experiment.

Single-Phase Inverter System Using New Modulation Method (새로운 변조방식을 사용한 단상 인버터 시스템)

  • Lee, Hyoung-Ju;Won, Hwa-Young;Lim, Seung-Beom;Hong, Soon-Chan
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.24 no.5
    • /
    • pp.29-36
    • /
    • 2010
  • In this paper, we propose a single-phase inverter system using new modulation method. The proposed system is composed of a buck-boost converter and an inverter and controlled by PWAM scheme. PWAM method is a new modulation method which is the incorporation of PWM(Pulse Width Modulation) and PAM(Pulse Amplitude Modulation) methods. The DC voltage which is the input voltage of buck-boost converter is converted into a variable DC voltage by buck-boost converter. Also, the variable DC voltage which is the output voltage of buck-boost converter is converted into a sinusoidal AC voltage by inverter. The input voltage of inverter is processed by PWM switching in PWM section and bypassed in PAM section. By using PWAM method, switching action is not existed in PAM section and thus the times of switching is reduced. As a result, the switching loss can be reduced.

Loss Analysis and Comparison of Grid-connected Bidirectional Inverter with Different Types of PWM Schemes (PWM 방식에 따른 계통연계 양방향 인버터의 손실양상 비교 및 분석)

  • Heo, Sung-Jun;Ahn, Hyo-Min;Byun, Jong-Eun;Lee, Byoung-Kuk
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.22 no.6
    • /
    • pp.547-550
    • /
    • 2017
  • This paper presents a loss analysis and compares three pulse width modulation (PWM) methods applied in a three-phase grid-connected bidirectional inverter for an energy storage system. The losses in switching devices and output low pass filters are theoretically analyzed by using PWM control techniques. Grid-connected bidirectional inverters are designed by using PWM techniques, and the designed inverters are simulated to verify the analysis results.

AWM Driving Method with Hybrid Current Control for PM-OLED Panel (수동형 OLED를 위한 복합 전류 제어 기능을 갖는 AWM 구동방식)

  • Kim, Seok-Man;Lee, Je-Hoon;Hur, Yeo-Jin;Kim, Yong-Hwan;Cho, Kyoung-Rok
    • The Journal of the Korea Contents Association
    • /
    • v.7 no.1
    • /
    • pp.116-123
    • /
    • 2007
  • This paper proposed a new amplitude width modulation for OLED data driver IC. The data driver controls brightness of OLED by adjusting amplitude and width of the data drive current pulse. There were two conventional methods; pulse amplitude modulation(PAM) and pulse width modulation(PWM). The PWM method suffered from lower light emitting time efficiency at low luminance signal. The PAM method suffered from large chip area using DACs for each column. The proposed method was aiming at accurately controlling of the current level by MSB data and light emitting efficiency by LSB data to improve the inefficiencies of the PAM and a PWM. The proposed AWM driver circuit implemented using $0.35-{\mu}m$ 3-poly 4-metal CMOS high voltage process. The simulation result shows the improvement in the accuracy of the gray level control even though the driver circuit is smaller than the PAM.

Performance Comparison of Common-Mode Voltage Reduction PWM Methods in Terms of Modulation Index (변조지수에 따른 공통모드 전압 저감 PWM 기법 성능 비교)

  • Heo, Geon;Park, Yongsoon
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.26 no.2
    • /
    • pp.135-140
    • /
    • 2021
  • This study introduces a new pulse width modulation (PWM) method to reduce common-mode voltages (CMVs) and then compares its performance with other reduced CMV-PWM (RCMV-PWM) methods. CMVs should be reduced to ensure the electromagnetic compatibility and safety of grid-connected inverters. RCMV-PWM methods attempt to synthesize voltage references without zero vectors, which cause high CMV peaks. In these methods, the peak-to-peak magnitude of CMVs can be reduced by one-third of the conventional space-vector PWM. The introduced method splits every reference vector into two vectors to avoid the use of zero vectors. The performances of the RCMV-PWM methods are analyzed in accordance with the modulation index through simulation and experiment.

A Study on The U Control of Resonant Inverters (공진형 인버터의 PWM 제어에 관한 연구)

  • 유완식;조규민
    • Proceedings of the IEEK Conference
    • /
    • 2000.06e
    • /
    • pp.17-20
    • /
    • 2000
  • Usually, in many applications, high frequency resonant inverters are used, and the PAM(Pulse Amplitude Modulation), PFM(Pulse Frequency Modulation) or PWM(Pulse Width Modulation) techniques are used to control the output power of resonant inverters. In this paper, a new switching scheme is proposed as a PWM control method. With the proposed method, it can be obtained that unity output displacement factor under the variable resonant frequency. The detail algorithm of the proposed PWM switching scheme and its charicteristics are discussed. And the validity of the proposed method is confirmed with the experimental results.

  • PDF