Topic
Electric power
About: Electric power is a research topic. Over the lifetime, 73036 publications have been published within this topic receiving 636991 citations.
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Patent•
20 Jan 1993
TL;DR: In this paper, a curb-side battery charging system that provides a mechanism for transferring electrical power to an electric vehicle to recharge its battery is described, which is typically located at the side of a street on the curb or at a battery charging station, for example.
Abstract: A weatherized curb-side battery charging system that provides a mechanism for transferring electrical power to an electric vehicle to recharge its battery. The battery charging system includes a housing (16) that is typically located at the side of a street on the curb, or at a battery charging station, for example. A retractable charging device (12) is coupled to a power supply and mates with a receptacle device disposed in the vehicle. A variety of charging devices that may be employed in the battery charging system (10) are disclosed. Electronic circuitry (24) controls power supplied to the vehicle from the power supply of the charging system. In addition, an interface circuit (26) is provided that allows a user to enter a code to use the system and that provides an identification for billing purposes, or a credit card type key that activates the system and performs the same functions. A fan (28) is provided for cooling purposes that causes an air flow through the system The curb-side charging system thus permits an operator of an electric vehicle to charge its battery in a convenient manner. The battery charging system (10) allows an electric vehicle to be charged safely without any type of conventional electrical plug. The battery charging system (10) provides a safe, convenient and weatherproof mechanism for coupling power from a voltage source to an electric vehicle to recharge its battery.
135 citations
25 Jul 2003
TL;DR: In this article, two types of piezoelectric materials were experimentally investigated for use as power harvesting devices, i.e., monolithic PZT and Macro Fiber Composites, which were recently developed at the NASA Langley Center.
Abstract: Piezoelectric materials can be used as mechanisms to transfer ambient vibrations into electrical energy that can be stored and used to power other devices. With the recent surge of micro scale devices, Piezoelectric power generation can provide a conventional alternative to traditional power sources used to operate certain types of sensors/actuators, telemetry, and MEMS devices. In this paper, two types of piezoelectric materials were experimentally investigated for use as power harvesting devices. The two types being the commonly used monolithic piezoelectric (PZT) and Macro Fiber Composites (MFC), which were recently developed at the NASA Langley Center. Our experimental results estimate the efficiency of these devices and identify the feasibility of their use in real world applications. In general the power produced by the vibration of a piezoelectric device is on the order of a few milliwatts which is far too little to power for most applications. Therefore, each the transducer is used to charge nickel metal hydride batteries of varying sizes to compare their performance and ability of to store electrical power. The results presented in this paper show the potential of piezoelectric materials for use in power harvesting applications.
135 citations
TL;DR: In this paper, a thermodynamic system study of trigeneration configurations using a commercial software integrated with specifically designed modules is presented, analyzes and compares heat recovery from the primary mover at different temperature levels.
135 citations
Patent•
21 Jan 2009TL;DR: The vehicle power supply apparatus as discussed by the authors has a power transmitting unit 110 including a power transmission side coil 111 for generating an alternating magnetic field, a positioning member 112 for positioning the power transmission and side coils 111 in a vehicle, and a power receiving unit 120 including a Power Receivers side coil 121 disposed in a rear window member 30 which is a non-magnetic portion of the vehicle 20 and generating an induced current.
Abstract: The vehicle power supply apparatus 100 has a power transmitting unit 110 including a power transmission side coil 111 for generating an alternating magnetic field, a positioning member 112 for positioning the power transmission side coil 111 in a vehicle 20 , and a power transmission side circuit 114 supplying an electric current to the power transmission side coil 111 ; and a power receiving unit 120 including a power receipt side coil 121 disposed in a rear window member 30 which is a non-magnetic portion of the vehicle 20 and generating an induced current based on an alternating magnetic field generated by the power transmission side coil 111 and a power receipt side circuit 122 supplying, to a power-supplied object, electric power based on the induced current generated by the power receipt side coil 121.
135 citations
TL;DR: In this article, an overview of microgrid configurations is given, and possible structure options and control methods of DER units are presented, which is followed by the descriptions of system controls and power management strategies for AC microgrids.
Abstract: The increased penetration of Distributed Energy Resources (DER) is challenging the entire architecture of conventional electrical power system. Microgrid paradigm, featuring higher flexibility and reliability, becomes an attractive candidate for the future power grid. In this paper, an overview of microgrid configurations is given. Then, possible structure options and control methods of DER units are presented, which is followed by the descriptions of system controls and power management strategies for AC microgrids. Finally, future trends of microgrids are discussed pointing out how this concept can be a key to achieve a more intelligent and flexible power system.
135 citations