Switching Frequency

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Jin Chyz Ou - One of the best experts on this subject based on the ideXlab platform.

  • Fixed Switching Frequency applied in single-phase boost AC to DC converter
    Energy Conversion and Management, 2009
    Co-Authors: Tien C. Chen, Jin Chyz Ou
    Abstract:

    The fixed Switching Frequency control for a single-phase boost AC to DC converter to achieve a sinusoidal line current and unity power factor is proposed in this paper. The relation between the line current error and the fixed Switching Frequency was developed. For a limit line current error, the minimum Switching Frequency for a boost AC to DC converter can be achieved. The proposed scheme was implemented using a 32-bit digital signal processor TMS320C32. Simulations and experimental results demonstrate the feasibility and fast dynamic response of the proposed control strategy.

  • Fixed Switching Frequency applied in single-phase boost AC to DC converter
    Energy Conversion and Management, 2009
    Co-Authors: Tien C. Chen, Tsai-jiun Ren, Jin Chyz Ou
    Abstract:

    The fixed Switching Frequency control for a single-phase boost AC to DC converter to achieve a sinusoidal line current and unity power factor is proposed in this paper. The relation between the line current error and the fixed Switching Frequency was developed. For a limit line current error, the minimum Switching Frequency for a boost AC to DC converter can be achieved. The proposed scheme was implemented using a 32-bit digital signal processor TMS320C32. Simulations and experimental results demonstrate the feasibility and fast dynamic response of the proposed control strategy. ?? 2009 Elsevier Ltd. All rights reserved.

Enric Fossas - One of the best experts on this subject based on the ideXlab platform.

  • Robust sliding mode control of a DC/DC Boost converter with Switching Frequency regulation
    Journal of The Franklin Institute-engineering and Applied Mathematics, 2018
    Co-Authors: Victor Repecho, Domingo Biel, Enric Fossas
    Abstract:

    Abstract This paper presents the design of a hysteresis band controller to regulate the Switching Frequency in a sliding mode controlled nonlinear Boost power converter. The proposed architecture relies on a piecewise linear modeling of the Switching function behavior within the hysteresis band, and consists of a continuous-time integral-type controller that modifies the amplitude of the hysteresis band of the comparator in accordance with the error between the desired and the actually measured Switching period. The study provides the dynamical models of the converter operating in sliding mode and the Switching Frequency control loop. Moreover, the design of the parameters of both the sliding mode control and the Switching Frequency controller guarantee the fulfilment of the desired output voltage regulation of the Boost converter and the steady state setting of the Switching Frequency with a known, taylored dynamics. A Boost power converter prototype has been built to validate the proposal. Experimental results confirm the predicted good performance of the controllers, as well as the robustness with respect to changes in the Switching Frequency reference and the system parameters.

  • Sliding Mode Control of Power Converters with Switching Frequency Regulation
    Advances in Variable Structure Systems and Sliding Mode Control—Theory and Applications, 2017
    Co-Authors: Victor Repecho, Domingo Biel, Enric Fossas
    Abstract:

    This chapter deals with the development of a hysteresis band controller in charge of fixing the Switching Frequency of a sliding mode controller. The proposed control measures the Switching period of the control signal and modifies the hysteresis band of the comparator in order to regulate the Switching Frequency of the sliding motion. The Switching Frequency control system is modelled and a design criterion for the control parameters is derived to guarantee closed loop stability. The technique is applied to power electronics. Specifically, DC-to-DC and DC-to-AC power converters are considered, a sliding mode controller providing robustness in the face of load disturbances and input voltage variations is designed and, finally, the stability analysis of these systems when the Switching Frequency is regulated is also presented. A set of numerical simulations will confirm the achievement of fixed Switching Frequency, robustness of the controller, and stability of the closed-loop system.

  • fixed Switching Frequency sliding mode control using an hysteresis band controller
    International Workshop on Variable Structure Systems, 2014
    Co-Authors: Victor Repecho, Domingo Biel, Enric Fossas
    Abstract:

    This paper presents a hysteresis band controller in charge of fixing the Switching Frequency of a sliding mode controller. The proposed control measures the Switching period of the control signal and modifies the hysteresis band of the comparator to regulate the Switching Frequency of the sliding motion. The Switching Frequency control system is modelled and a design criterion of the control parameters is derived to guarantee the closed loop stability.

  • VSS - Fixed Switching Frequency sliding mode control using an hysteresis band controller
    2014 13th International Workshop on Variable Structure Systems (VSS), 2014
    Co-Authors: Victor Repecho, Domingo Biel, Enric Fossas
    Abstract:

    This paper presents a hysteresis band controller in charge of fixing the Switching Frequency of a sliding mode controller. The proposed control measures the Switching period of the control signal and modifies the hysteresis band of the comparator to regulate the Switching Frequency of the sliding motion. The Switching Frequency control system is modelled and a design criterion of the control parameters is derived to guarantee the closed loop stability.

Tien C. Chen - One of the best experts on this subject based on the ideXlab platform.

  • Fixed Switching Frequency applied in single-phase boost AC to DC converter
    Energy Conversion and Management, 2009
    Co-Authors: Tien C. Chen, Jin Chyz Ou
    Abstract:

    The fixed Switching Frequency control for a single-phase boost AC to DC converter to achieve a sinusoidal line current and unity power factor is proposed in this paper. The relation between the line current error and the fixed Switching Frequency was developed. For a limit line current error, the minimum Switching Frequency for a boost AC to DC converter can be achieved. The proposed scheme was implemented using a 32-bit digital signal processor TMS320C32. Simulations and experimental results demonstrate the feasibility and fast dynamic response of the proposed control strategy.

  • Fixed Switching Frequency applied in single-phase boost AC to DC converter
    Energy Conversion and Management, 2009
    Co-Authors: Tien C. Chen, Tsai-jiun Ren, Jin Chyz Ou
    Abstract:

    The fixed Switching Frequency control for a single-phase boost AC to DC converter to achieve a sinusoidal line current and unity power factor is proposed in this paper. The relation between the line current error and the fixed Switching Frequency was developed. For a limit line current error, the minimum Switching Frequency for a boost AC to DC converter can be achieved. The proposed scheme was implemented using a 32-bit digital signal processor TMS320C32. Simulations and experimental results demonstrate the feasibility and fast dynamic response of the proposed control strategy. ?? 2009 Elsevier Ltd. All rights reserved.

Dong Jiang - One of the best experts on this subject based on the ideXlab platform.

  • A Variable Switching Frequency PWM Control Method for Single-Phase MMC
    2019 4th IEEE Workshop on the Electronic Grid (eGRID), 2019
    Co-Authors: Dong Jiang, Qiao Li, Jianan Chen
    Abstract:

    Traditional constant Switching Frequency pulse-width-modulation (CSFPWM) would cause high electromagnetic interference (EMI) peak ratio and high Switching loss. This letter introduces a method to make the carrier Frequency of the single-phase modular multilevel inverter (MMC) change with the output current by using variable Switching Frequency PWM (VSFPWM). By adjusting the carrier Frequency of single-phase MMC, the Switching period of PWM pulse based on carrier signal comparison is adjusted to control the Switching Frequency of single-phase MMC driven by PWM pulse. When the load current is zero, the Switching Frequency is maximum, and when the load current is maximum, the Switching Frequency is minimum. In addition, the average Switching Frequency is equal to the fixed Switching Frequency in the control cycle. This method aiming at Switching loss optimization in high power application also has benefit in reducing system conduction EMI because of the wider current harmonic spectrum distribution.

  • An Improved Variable Switching Frequency Modulation Strategy for Three-Level converters with Reduced Conducted EMI
    2019 IEEE Energy Conversion Congress and Exposition (ECCE), 2019
    Co-Authors: Jianan Chen, Dong Jiang, Zewei Shen, Yechi Zhang
    Abstract:

    Three-level inverters with variable Switching Frequency PWM (VSFPWM) can decrease conducted EMI because of more voltage levels and changed Switching Frequency. However, there are many distinct EMI spikes remaining in spectrum for most cases of modulation index, which degenerates the effect on suppressing conducted EMI. Therefore, this paper proposes an improved variable Switching Frequency modulation strategy to eliminate the EMI spikes in spectrum for three-level inverters. The principle of Switching Frequency change is that the Switching Frequency obeys normal distribution, which can make the conducted EMI reduce more than 20dB for the full modulation index. Relevant experimental results validate the effectiveness of proposed method on reducing conducted EMI.

  • A comprehensive investigation on conducted EMI reduction for variable Switching Frequency PWM
    2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Compatibility (EMC APEMC), 2018
    Co-Authors: Jianan Chen, Dong Jiang, Xuan Zhao
    Abstract:

    This paper investigates the conducted EMI reduction of variable Switching Frequency PWM (VSFPWM) method compared with constant Switching Frequency PWM (CSFPWM) for three-level inverters. Many factors such as DC bus voltage, Switching Frequency of CSFPWM method, and modulation index are taken into consideration to research their influence on reducing conducted EMI for VSFPWM. The DC bus voltage has nothing to do with the reduction of conducted EMI no matter how high the voltage is. However, original Switching Frequency and modulation index have great impact on conducted EMI reduction. The appropriate choice of carrier Frequency and modulation index for CSFPWM can make corresponding VSFPWM achieve great reduction on conducted EMI. An optimal operating condition is designed to indicate the fact that the conducted EMI can be reduced by nearly 20dB. Relevant experimental results together with analysis validate that VSFPWM has huge advantage on reducing conducted EMI in comparison with CSFPWM.

  • variable Switching Frequency pwm for three phase converters based on current ripple prediction
    IEEE Transactions on Power Electronics, 2013
    Co-Authors: Dong Jiang, Fei Wang
    Abstract:

    Compared with the widely used constant Switching Frequency pulse-width-modulation (PWM) method, variable Switching Frequency PWM can benefit more because of the extra freedom. Based on the analytical expression of current ripple of three-phase converters, variable Switching Frequency control methods are proposed to satisfy different ripple requirements. Switching cycle $T_{s}$ is updated in DSP in every interruption period based on the ripple requirement. Two methods are discussed in this paper. The first method is designed to arrange the current ripple peak value within a certain value and can reduce the equivalent Switching Frequency and electromagnetic interference (EMI) noise; the second method is designed to keep ripple current RMS value constant and reduce the EMI noise. Simulation and experimental results show that variable Switching Frequency control could improve the performance of EMI and efficiency without impairing the power quality.

  • Variable Switching Frequency PWM for three-phase converter for loss and EMI improvement
    2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2012
    Co-Authors: Dong Jiang, Fei Wang
    Abstract:

    Compared with the widely used constant Switching Frequency PWM method, variable Switching Frequency PWM can benefit more because of the extra freedom. Based on the analytical expression of current ripple of three-phase converter discussed in “Study of Analytical Current Ripple of Three-Phase PWM Converter” in APEC 2012, variable Switching Frequency PWM (VSFPWM) methods are proposed to satisfy different ripple requirements. Two methods are discussed in this paper. The first method (VSFPWM1) is designed to arrange the current ripple peak value within a certain value, and can reduce the equivalent Switching Frequency and EMI noise; the second method (VSFPWM2) is designed to keep ripple current RMS value constant and reduce the EMI noise. Simulation and experimental results show that variable Switching Frequency control could improve the performance.

Jungik Ha - One of the best experts on this subject based on the ideXlab platform.

  • pwm Switching Frequency signal injection sensorless method in ipmsm
    IEEE Transactions on Industry Applications, 2012
    Co-Authors: Jungik Ha
    Abstract:

    The rotor position of an interior permanent-magnet synchronous machine (IPMSM) can be estimated without a position sensor by signal injection sensorless control at standstill and/or in very low speed rotating condition. In the signal injection sensorless control, however, the fundamental control performance is limited by the Frequency of the injected signal, and no negligible acoustic noise is generated. If the Frequency of the injected voltage signal would increase to pulsewidth modulation (PWM) Switching Frequency and if the Switching Frequency is near or above audible range, the dynamics of the sensorless control can be improved, and the acoustic noise can be remarkably reduced or totally eliminated. This paper describes how to extract the rotor position information of IPMSM using the voltage signal injection whose Frequency is the same as the PWM Switching Frequency. Compared to the conventional heterodyning process, the proposed method is simple to implement and appropriate for PWM Switching Frequency signal injection. The high-Frequency voltage signal can be injected in the stationary reference frame or in the estimated rotor reference frame. In this paper, the 5- and 16-kHz signal injections are proposed, implemented, and compared. The experimental results confirm the effectiveness of the proposed method.

  • pwm Switching Frequency signal injection sensorless method in ipmsm
    Energy Conversion Congress and Exposition, 2011
    Co-Authors: Jungik Ha
    Abstract:

    This paper describes how to extract the rotor position information using a PWM Switching Frequency voltage signal injection without position sensor in Interior Permanent Magnet Synchronous Machine (IPMSM). The Frequency of injected voltage signal is increased to PWM Switching Frequency, and the dynamics of the sensorless control can be improved. Compared to conventional heterodyning process, the proposed method is simple to implement and appropriate for PWM Switching Frequency signal injection. The high Frequency voltage signal can be injected in the stationary reference frame or in the estimated rotor reference frame. In this paper, two sensorless methods are proposed according to the injection reference frame. To verify the proposed methods, 5kHz voltage signal injection with 5kHz PWM Switching Frequency inverter system in both reference frames were implemented. The experimental results confirm the effectiveness of the proposed method.