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This paper presents a current sensor-less hysteretic current mode switching power supply. Switching power supplies are controlled in the voltage mode or the current mode. The current mode converters are used in the power system which requires of high reliability because it has high stability of the feedback loop compared with the voltage mode converter. The current mode converter is necessary to detect...
This paper proposes a dc power supply system to give high power factor and low current distortion on the rectifier side and provide stable dc voltage on the isolated dc/dc converter side. The proposed dc power supply system uses a new ZCS strategy to get ZCS function. Besides operating at constant frequency, all semiconductor devices operate at ZCS without additional current stress. A significant...
We present an integrated approach for allowing a commercial building to reduce the peak demand of electrical power by air conditioning control, while maintaining comfort. The proposed method controls simultaneously, the power demand and room temperature change in the building. Power demand forecast is used to forecast the time of peak demand for the building. Heat capacity modeling is used to estimate...
As energy storage finds its way into everyday life around the world, focus on design for safety is imperative for battery technology to be adopted worldwide. Energy storage, especially as applied in telecom systems, must be properly managed independent of energy storage technology or battery chemistry. The paper will start with the roles of a simple battery management system and then scale up to the...
The development of wireless power charging radiator for mobile device and its efficiency characterization are presented. The radiator which is designed using a microstrip patch in spiral shape is intended to work at operating frequency around 10MHz. Some investigations over the gap between 2 radiators are carried out to analyse the effect of varied gap separations to the reflection and transmission...
This paper discusses a control method for an electrolytic capacitor-less single-phase AC/DC converter with PFC capability and with constant dc-output voltage. Generally, single-phase AC/DC converters employ bulky electrolytic capacitors in order to smoothen the ripple power with twice the utility frequency. The proposed control method uses a T-type NPC circuit with a small film capacitor and decouple...
An accurate circuit and device model is a valuable tool for developing new topologies, building successful designs, and shortening time to market. The input, output, and reverse transfer capacitance of power MOSFET are of vital importance to the MOSFET as they determine the dynamic behavior of the device during switching transients. In this study, the static characteristics of a specific GaN device...
This paper describes lateral misalignment characteristics of electrical resonance coupling wireless power transfer (ERC-WPT) from experimental points of view. A dead zone is an important factor for ERC-WPT because ERC-WPT cannot transfer electric power in the zone. Electrical coupling units that are composed of 2 electrodes lined up laterally have a dead zone. The dead zone exists near outer edge...
Wireless Power transfer using electric field can realize highly efficient electrical power transmission and the transmission units are thin and light. However, the transmission system produces large electric field intensity and the electric field noise can make other electronic devices malfunction. A shield box is greatly effective to reduce the electric intensity 60dB without a decline of transmission...
Recently renewable energy has attracted a lot of attention and solar power generation systems and wind power generation systems are widely used as public eco-awareness increases. Generally inverters are used in such power generation systems. They need high efficiency. Multi-level technique improves efficiency of inverters.
The latest Electric Vehicles (EV)-related power electronics have attracted special interest as one of effective solutions to energy and environmental issues. In order to implement a promising EV battery charging equipment and its EMS infrastructures for carports in private houses and public buildings, Wireless Power Transfer (WPT)-based on-board chargers (OBC) are more suitable and acceptable from...
The purpose of this paper is to reveal possibility that suppression of output capacitance on dc-dc converter by applying fast P control method. Furthermore, in HVDC system, a consideration whether this control method is effective for miniaturization of output capacitor is presented. A prototype uses 800 W full-bridge dc-dc converter.
The purpose of this paper is to present the performance characteristics of the digital PID based two-compensator for the dc-dc converter. Authors have already presented a fast PD control method, which can reduce the influence of the delay time. In this paper, the transient characteristics of output voltage are confirmed in the simulation when the sampling frequency of the PID control is slowed down...
A foreign object detection has issued as a problem to be solved urgently on the wireless charging system of electric vehicles. In this paper, the tech tree of the foreign object detection in the view of patent in advanced American and Japanese companies is introduced.
We verified that a large selective breaking capacity could be ensured without using high-performance breakers by conducting breaking tests as a distribution board rather than making the selection based on the catalog specifications of the breaker manufacturer when selecting a breaker for distribution boards in data centers.
Power consumption of the ICT sector of information and communication facilities and data centers has grown, and this has led to a need to improve energy efficiency of these facilities. DC distribution systems employing 380 VDC as the supply voltage is one promising approach to address this problem, countries around the world and are progressing to develop and deploy commercial services. We demonstrated...
Contactless power transfer (CPT) could provide much convenience and so there have been much commercial interests on CPT recently. Sooner or later, CPT technology is expected to be applied to various electronic devices with transceiver coils for CPT such as electric vehicles, mobile devices and etc. Then the coils in different electronic devices for CPT can cause electromagnetic interference (EMI)...
Wireless power transfer (WPT) technology has been attracted increasing interest with the developments in electronic vehicle and ubiquitous society. Among WPT technologies, research on power transfer to plural receivers is one of the most emerging topic. However, those single input multi output wireless power transfer (SIMO-WPT) system still does not consider selective transmission to certain designated...
A ZCS-PWM interleaved boost rectifier with high power factor is proposed in this paper. The pulse-width-modulation technique and soft commutation technique are used in the proposed rectifier to promote the circuit performance. The proposed circuit includes two boost converter which are operated at interleaved mode to increase the output power and reduce the input ripple current. A ZCS-PWM auxiliary...
This paper proposes a control method to extend the range of ZVS in the phase-shifted full-bridge(PSFB) converter without any additional auxiliary components. During the dead-time, ZVS is achieved by using the energy stored in the inductors to discharge and charge the output capacitance of switches. By analyzing the equivalent circuit of the converter during dead-time, the relationship between the...
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