Search

Along with the recent developments of environmentally friendly vehicles, there is an active technological development effort into the fuel efficiency enhancement of the existing internal combustion engine vehicles. As part of such technological development effort, researches are being conducted on the use of lithium batteries as the starter battery for internal combustion engine vehicles in place of lead-acid batteries, which have already been released as a test product for high-end vehicles. While the use of lithium starter battery as a replacement is expected to lead to various advantages and disadvantages at the same time, there is a lack of specific research on this area. Therefore, in this paper, we present a quantitative analysis of characteristics and performance in internal combustion engine vehicles with different battery types. For this purpose, we simulate a power-net system of a vehicle including charging control through a test bench based on actual vehicle data, and develop automotive power-net HILS by combining the test bench with a powertrain model. Based on HILS, we conduct tests of vehicles with AGM battery and lithium battery under various test scenarios, in order to comparatively analyze the characteristics and performance of the vehicle.

In this paper, the mode selection algorithm and the control flow chart are proposed for DC-module integrated converter (DC-MIC), which can be operated under mismatch problem of each PV module. In order to operate DC-MIC, a simple configuration control algorithm is proposed. This algorithm includes mode selection method to operate switch of cascaded buck-boost converter simply which has two kind of functioned switches. Based on the control algorithm, a system flowchart is also proposed. The validity of the proposed control algorithm and the flowchart are verified by experimental results based on 250W DC-MIC with grid connection inverter.

This paper carries out feasibility study of DC home appliance in appropriate of DC power supply system. For this purpose, the difference of structure and safety between AC and DC home appliance is comparatively analyzed, and the countermeasures against predicted problems are suggested in advance. The power simulator of general specifications is designed for comprehensive evaluation. Under this experimental test-bed, the possibility of DC home appliance with these countermeasures is verified.

This paper performs analysis and verification of active inrush current limiter (AICL) using the MOSFET for high-voltage DC power supply. To active this, the performance characteristic of AICL is analyzed comparatively with inrush current limiters using inductor, NTC thermistor, and relay, which have been used to protect the devices. And utilized of AICL when is applied to high-voltage DC power supply is considered. In addition, a study on the relationship between the strength of a limited current, settling time and parameter of devices, which are organized AICL is performed. To verify effectiveness of AICL experiment is carried out using actual parameters. Through this study, utilization and reliability of AICL for high-voltage DC power supply is analyzed and evaluated theoretically and experimentally.

To analyze the electrical performance of individual PV modules in the field, I–V curve tracers or micro inverters are typically used with the associated shortcomings. In this study, we used a precision electronic load to analyze the electrical performance of individual PV modules. The electronic loads have been used for empirical field studies on 12 PV modules installed in Hyundai Heavy Industries test site (Eumseong factory). Three sets of the electronic loads and controllers have been installed, with each set capable of handling 4 PV modules in a time-divided manner. The main advantages of the electronic load are its low price, high precision, wide input ranges for voltage, current and power, and easy control by electrical communication. Initially, the biggest drawback of the electronic load was the slow control speed, but we resolved the issue by applying a new tracking algorithm.

We analyzed the cell-to-module power conversion loss (CTM power loss) of industrial monocrystalline- (mono-Si) and multi-crystalline-silicon (multi-Si) solar cells. To reduce the CTM power loss of industrial solar cells by improving the optical losses, we investigated the effect of spacing between cells in a PV module by quantum efficiency measurement.

In this paper, the control performances of the three phase SVPWM inverter according to the phase current measuring method are compared. For this comparison, the current measuring methods using a current transducer (CT) and a shunt resistor are adopted. Furthermore, in the case of three shunt resistors are connected between under the emitter of power switch and the dc-link ground for phase current measuring in the SVPWM inverter, the restriction is analyzed and the output voltage compensation method is proposed to fix these problem. The experimental result using 1.5kW lab-prototype set is presented for the performance verification.

Measurement of the background radio noise is very important process being used in survey of radio noise environment, calculating the threshold level for the frequency occupancy measurement and so forth. First step of background radio noise measurement is to select the sample sub-band which is mostly dominated by the background white Gaussian noise (WGN) within the target band. The second step is to carry out the main measurement of radio noise on this selected sample sub-band for the representative value of the noise power. In this paper, an algorithm for selection of sample sub-band for the effective background radio noise measurement using SVD is proposed under the assumption that background radio noise is WGN. The performance of the proposed algorithm is compared with that of the APD method which is widely used for the same purpose. Simulation results are shown to demonstrate the high performance of the proposed algorithm in comparison with the existing APD method.