Yohei Mochizuki

Bio: Yohei Mochizuki is an academic researcher from University of Electro-Communications. The author has contributed to research in topics: Switched-mode power supply & Power factor. The author has an hindex of 1, co-authored 5 publications receiving 4 citations.

Design of approximate 2DOF digital controller for interleaved PFC boost converter

Abstract: In general, a current conduction mode boost converter is used for active PFC (Power Factor Correction). In a PFC boost converter, if a duty cycle, a load resistance and an input voltage are changed, the dynamic characteristics are varied greatly. This is the prime reason of difficulty of controlling the interleaved PFC boost converter. In this paper, the robust digital controller using an A2DOF (Approximate 2-Degree-Of-Freedom) method for suppressing the variation of output voltage in dynamic load response with high power factor and low harmonic is proposed. Experimental studies using a micro-processor for controller demonstrate that this type of digital controller is effective to improve power factor and to suppress output voltage variation.

Robust digital control for interleaved PFC boost converter using approximate 2DOF

Abstract: In recent years, improving of power factor and reducing harmonic distortion in electrical instruments are needed. In general, a current conduction mode boost converter is used for active PFC (Power Factor Correction). In a PFC boost converter, if a duty ratio, a load resistance and an input voltage are changed, the dynamic characteristics are varied greatly. This is the prime reason of difficulty of controlling the interleaved PFC boost converter. In this paper, a robust digital controller for suppressing the change of step response characteristics and variation of output voltage at a DC-DC buck converter load sudden change with high power factor and low harmonic is proposed. Experimental studies using a micro-processor for controller demonstrate that this type of digital controller is effective to improve power factor and to suppress output voltage variation.

Approximate 2-Degree-of-Freedom control for interleaved PFC boost converters

Abstract: Making power factor and harmonics distortion of power supply better are needed. An interleaved boost converter is used for an active PFC (Power Factor Correction) for reducing ripples. In the PFC boost converter, if a duty ratio, a load resistance and an input voltage are changed, the dynamic characteristics are varied greatly. This is a prime reason of difficulty of controlling the PFC boost converter. In this paper, a robust digital controller of the interleaved PFC boost converter using an A2DOF (Approximate 2-Degree-Of-Freedom) method for keeping up high power factor and low harmonics against any load is proposed. Experimental studies using a microcontroller for the controller demonstrate that this type of digital controller is effective to improve power factor and to suppress the output voltage variation.

Approximate 2DOF Digital Controller for Interleaved PFC Boost Converter

Abstract: In recent years, improving of power factor and reducing harmonic distortion in electrical instruments are needed. In general, a current conduction mode boost converter is used for active PFC (Power Factor Correction). In a PFC boost converter, if a duty cycle, a load resistance and an input voltage are changed, the dynamic characteristics are varied greatly. This is the prime reason of difficulty of controlling the interleaved PFC boost converter. In this paper, the robust digital controller using an A2DOF (Approximate 2-Degree-Of-Freedom) method for suppressing the variation of output voltage in dynamic load response with high power factor and low harmonic is proposed. Experimental studies using a micro-processor for controller demonstrate that this type of digital controller is effective to improve power factor and to suppress output voltage variation.

Independent Control of Inductor Current and Output Voltage of Interleaved PFC Boost Converter using Approximate 2-Degree-of-Freedom

Abstract: Making power factor and harmonics distortion of power supply better are needed. An interleaved boost converter is used for an active PFC (Power Factor Correction) for reducing ripples. In the PFC boost converter, if a duty ratio, a load resistance and an input voltage are changed, the dynamic characteristics are varied greatly. This is a prime reason of difficulty of controlling the PFC boost converter. In this paper, an independent control of an inductor current and an output voltage of the interleaved PFC boost converter using A2DOF (Approximate 2-Degree-Of-Freedom) is proposed. Experimental studies using a micro- processor for the controller demonstrate that the proposed digital control is effective to improve power factor and to suppress the output voltage variation at the load sudden change.

Digital Control of Power Factor Correction

Abstract: Nowadays it is popular to use digital control in power supply design.A PFC project based on average current control is presented. Hardware and software of the control system are analyzed.The simulation results of Matlab confirm that the circuit parameters are appropriate.A laboratory prototype based on TMS320LF2407A is presented.The test results validate a good performance of the digital implementation under the AC line voltage variation,with the switching frequency 50 kHz.

Simple high voltage-gain DC/DC boost converter for renewable energy sources interfacing

Abstract: This article advises a simple high voltage-gain boost converter for interfacing a low voltage renewable energy source to high voltage DC-link. The proposed converter could produce high quality input/output powers, which reduces the losses and filtering requirements in input/output stages. The article introduces also a thorough mathematical analysis for the operation theory of the proposed converter. Moreover, the dynamic performance of the proposed converter is investigated for two distinct cases: driving a PV module at maximum power point under different climatological conditions and interfacing an energy storage element to DC-link. The internal model control technique is used here for tuning the proportional integral controller. The proposed converter and its controller are simulated in Matlab Simulink dynamic platform. The simulation results for different operating scenarios of the proposed DC/DC converter confirms its salient merit in producing high value/quality DC voltage.

The Parametric Simulation of the Interleaved Boost Converter for the Electric Transport Vehicle

Abstract: This paper deals with the analysis of four phase boost interleaved DC-DC converter with the non-coupled inductors for higher power application in Continuous Conduction Mode. The interleaved topology reduces input and output current ripple, voltage ripple and improves the efficiency of SMPS. The value of capacities and inductances affect the behavior of the converter. The investigation of these parameters is described and supported by parametric simulation in LT spice.

Multiphase DC-DC Boost Converter: Introduction to Controller Design

Abstract: Many investigators of the industry and academia have given their attention to analyse and design of multiphase DC-DC converter for high performance applications. This study puts forward a novel graphical technique loop shaping to design a robust controller for a multiphase DC-DC converter that is open loop stable but non minimal phase system. The study servs the outstanding experimental and simulation results of the proposed controller which is materialized on multiphase DC-DC converter using Typhoon HIL 402 (real time hardware in the loop (HIL)). Further, it is investigated for stability and robustness to confirms the ability of the proposed controller.

Design PI+Approximation 2DOF Digital Control for Improve Response of Interleaved Buck Converter

Abstract: In this paper, if parameters of interleaved buck converter is small changed but the dynamic characteristics are changed large, that is, the interleaved buck converter has nonlinear characteristics. Therefore, using the original controls is not appropriate. In this paper, proposed a PI+A2DOF digital controller (Proportional Integral plus Approximate 2 Degree Of Freedom) for regulation output voltages when sudden load change. The controller is implemented by Microcontroller has serial number MIMXRT1062DVL6A of Freescale semiconductor. Experimental studies between the PI and PI+A2DOF controller. In the PI+A2DOF controller has overshoot smaller less than 50mV or 1.51%. On the other hand, PI controller has overshoot about 200mV or 6.06%. It is demonstrated from experiments that the PI+A2DOF controller can be regulated output voltages.