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To increase the reliability of renewable energy production, the local environment variables have to be monitored closely, such as the chamber/nacelle temperature and humidity. In such harsh working conditions, acquiring auxiliary power for such sensor load can harm system reliability if the power is drawn directly from the supply or load lines. This paper proposes a non-intrusive power supply system...
This paper proposes a new method of output optimization for a wideband vibration-based impact mode piezoelectric power generator. The method utilizes indirect impact configuration so that the impact forces will be optimally transferred to the device. As a result, at certain frequency, the peak voltage increases by 4.3 times that of the direct impact configuration.
Demands for automatic food processors are growing rapidly year by year. In this paper, a novel viscosity measurement method which can provide real-time monitoring in food processing application has been proposed. Instead of using a torque sensor for the viscosity measurement, the proposed method applies disturbance observer-based estimation technique to the viscometer. The effectiveness of the proposed...
The operation state of photovoltaic Module Integrated Converter (MIC) is subjected to change due to different source and load conditions, while state-swap is usually implemented with flow chart based sequential controller in the past research. In this paper, the signatures for different operational states are evaluated and investigated, which lead to an effective control integrated finite state machine...
This paper presents a study on effect of two mechanical impact parameters on impact mode piezoelectric power generation. The parameters are velocity and mass. Free fall experiment is used as the evaluation method. It turns out that peak of instantaneous output voltage is proportional to the impact velocity and for output power it is in a straight line relationship with the same parameter. For the...
Vibrational energy harvesting is gaining more and more attentions recently due to increasing power demands for on-board and remote applications. Piezoelectric Zirconate Titanate (PZT) based cantilever structure is one of the popular forms for vibrational energy harvesting. However, due to its complex electromechanical characteristics, the energy harvesting still remains as a challenge. This paper...
Vibration energy regeneration with lead zirconate titanate piezoelectric (PZT) device has been reported by many researchers for many years. Various factors influence the energy regeneration efficiency of the PZT devices in converting the mechanical vibration energy to the electrical energy. This paper presents the analytical and experimental evaluation of energy regeneration efficiency of PZT devices...
This paper shows the calculation method of several loses and motor efficiency using the simple equivalent circuit, in which copper loss, eddy current loss, hysteresis loss, friction loss and viscous loss, and inverter loss are taken into account. We clarify each loss of the brushless DC motor and motor efficiency at different motor speeds and different output torques using the Microsoft-Excel. Moreover,...
In this paper, a digital-controlled multi-phase electronic current sink is proposed. The wide Safe Operation Area (SOA) MOSFETs are used as the power dissipating device, which are regulated to the saturation region by filtered PWM gate signals. Due to the inherent limitation of switching frequency and sampling rate in digital systems, interleaved multi-phase PWM scheme is proposed to provide active...
Digital control of a general-purpose switching power supply is one of the key technologies to perform the high reliability and the intelligent functions demanded for the next generation. In this paper, the experimental identification method is firstly applied to the developed digital control-based switching power supply. Based on the identified model, the model-based control system is constructed...
Comparing to conventional fossil fuels, hydrogen yields no emission through various thermal and electro-chemical processes. Beyond this feature, high energy density and transportability make hydrogen an attractive candidate for the future energy systems. Hydrogen gas can be harvested from a wide selection of hydrogen enriched molecules through different reforming processes. Among a variety of fuel...
In achieving the practical use of vibration power generation, the challenges are that the energy to be generated is small and the vibration frequency range for efficient power generation is limited. So, it is needed to improve the output level and establish a vibration transmission structure capable of covering a wider vibration frequency range. In this report, we propose a multi-axis vibration power...
The present paper describes the development of a three-axis vibration machine that precisely reproduces the vehicle's acceleration characterized by multi-mode vibration. For reproduction along the vertical axis, a system identification experiment of the vibrator is first performed. Using the identified model, the feedforward control based on the pole-zero cancellation method is applied in order to...
Vibration power generation is one of energy harvesting technologies using renewable energy. In this paper, a novel vibration power generation device for vehicles where effective power generation can be obtained by multi-mode vibration of the vehicles is presented. First, road tests of the vehicle are performed, and then the obtained data is analyzed. Next, a vibration power generation device specially...
Lifespan of product is essential information for material flow and stock accounting (MFA/MSA) as well as discussing possible contribution of product lifespan extension to waste prevention and materials/energy savings. There are a number of literatures on actual lifespan distribution of products in our society; however, existing information is not well organized. The authors created a database named...
Conservation of the environment has become critical to the automotive industry. Recently, requirements for on-board diagnostic and engine control systems have been strictly enforced. In the present paper, in order to meet the requirements for a low-emissions vehicle, a novel construction method of the air-fuel ratio (A/F) control system is proposed. The construction method of the system is divided...
Conservation of the environment has become critical to the automotive industry. Recently, requirements for on-board diagnostic and engine control systems have been strictly enforced. In the present paper, in order to meet the requirements for a low-emissions vehicle, a novel construction method of the air-fuel ratio (A/F) control system is proposed. The construction method of the system is divided...
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