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Line powering is a means of energizing remote equipment, from a centralized location, over the outside plant (OSP) telecom copper twisted-pair cable. It has been used for decades in telecom networks for various applications such as T-1 repeater powering, HDSL remote unit powering and DSLAM powering. Currently, line powering is being deployed for several telecommunication applications such as FTTN,...
Utility-interactive photovoltaic power generations have been accepted and spread widely. Various innovative power conditioning systems have been also studied. In domestic utilization, the actual application of such solar panels is almost installed on top of the roof of the detached house. However, some residents living in the apartment house are having fairly strong desire to contribute for energy...
In this paper, a novel high step-up converter with coupled inductor boost converter is proposed. The circuit topology of the proposed converter is derived from conventional boost converter with coupled inductor connection such that high step-up voltage gain with proper duty ratio is achieved. Besides, the coupled-inductor technique concept also can be adopted to construct other step-up converters...
In this paper, a novel simple power switching method for dc switching devices is proposed to apply to HVDC system of more than 380 V DC. The method extends and extinguishes an arc between electrical contacts when opening power circuit. In addition, the power circuit can be disconnected even if the current direction reverses. The method is composed simply by using a unique combination of a small magnet,...
This paper designs and implements a charger with high output current for EV batteries, the structure of the charger is formed of a four-phase interleaved buck converter with synchronous rectification and associated with the digital controller, in which the current sharing control is realized. The interleaved control scheme can reduce the output ripple and decrease the power component stress in battery...
The electric power generation system using the renewable energy has the essential problem of the output fluctuation. With expanding deployment of renewable energy, it is necessary to smooth the fluctuation of both long and short term frequency. One of the solutions to solve this problem is combining the renewable energy and the storage batteries. It is important to install the large storage system...
We propose a multi input voltage and multiple output voltage DC-DC converter using H-bridge converter for power supply on chip. We analyzed the operation mode of the H-bridge converter and also propose the suitable operation mode for power supply on chip. The proposed POLs realize stable output voltage and high efficiency over the wide range through digital control.
To drive SiC power module with high-speed switching, the stray inductance becomes a key factor in converter design. In this work, the stray inductances of module and peripheral circuits are investigated by simulation and measurement. With the loop stray inductance of 29.2 nH, the module is tested up to 800 V and 50 A with insignificant EMI issues of ringing and overshoot. And the dv/dt ratios at turn-off...
Energy consumption in Japan has been increasing year by year. In particular, energy consumption of the civilian sector and the transportation sector have doubled since the first oil crisis. Recently, energy saving activities, such as the power peak-cut or power peak-shift for the purpose of reducing electricity bills, is carried out. On the other hand, in the demand side of electric power, research...
This paper develops an integrated traffic-power control algorithm based on a previously proposed cellular networks study. A real-time battery bank state of charge (SOC) estimation technique is introduced using predicted renewable energy. The proposed approach allows the cellular networks system to be more resilient by increasing power supply availability and reducing the excessive discharges which...
Conventional power management schemes for standalone wind systems typically use maximum power point tracking (MPPT) methods to extract maximum power from the wind even when the energy storage has reached its capacity. By doing so, the dummy load suffers from unnecessary stress when the load and energy storage element cannot absorb the excess power. This paper proposes an intelligent sensor-less fuzzy-logic...
The purpose of this paper is to propose an evaluation method for determining the cost-effectiveness of the multiple power quality supply system including the potential differences in system size and power configurations. This proposal uses the discounted cash flow method to convert annual cash flows to a present value for comparison to the initial investment. The results show that the investment can...
Communication relay stations often suffer from common-mode noise generated by high speed switching in a boost chopper equipped for power supply. This problem can be addressed by applying soft-switching techniques to the boost chopper, although this can lead to significant increase in the circuit volume. To address this difficulty, this paper proposes a novel passive regenerative turn-off snubber applicable...
The communication power supply need to meet the requirements of high dynamic and steady state, so as to ensure the stability when disturbed. V2C control method is studied by analyzing the effect of the parameters on the output with the help of small signal model. Then the V2C adaptive control method based on fuzzy rules is put forward to improve dynamic response and stability of system when disturbed,...
This paper presents the predictive control of single-phase UPS system for fast dynamic characteristic. When occurring grid fault, UPS system has to transfer UPS mode and supply power to the load. In PI controller, it has a disadvantage rather low dynamic characteristic, which is caused increasing transient time. To solve this problem, the predictive control is proposed. By adopting predictive control...
To take advantage of volatile renewable energy, implementation of digital control is effective since it supports the application of various advanced control theory and communication functions. However, it is usually difficult to use the actual plant to be controlled at the control software development stage, particularly in terms of cost and safety. Therefore, during the control software development...
This paper presents analysis and design method of hysteretic PWM controller. Analysis based on averaged model was performed. Results of analysis show the controller has the characteristics of type 2 and clarify characteristics given by the circuit elements. The circuit design is performed by using the analysis results. It shows the procedure for giving the parameters of the control circuit. Design...
Microgrid is a single controllable unit constituting distributed generation (DG) and load in the power system. The micro source includes photovoltaic (PV) cells, wind turbine, micro turbine, fuel cell, electric accumulator and flywheel etc. Usually, the micro source operates in parallel with the normal distributed network that uses the power electronic devices. There are two typical operation modes...
This paper presents design and implementation of a dc/dc converter with division-summation (D-Σ) digital control. With the control, the converter is allowed to have wide inductance variation caused by high current flowing through inductor, and to track current reference precisely for achieving tight output voltage regulation. Moreover, the control can reduce steady-state error as compared with peak...
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