1108results about How to "Convenient power supply" patented technology

A controller generates a load control signal for pulse-width modulation control for changing the duty factor of switching transistors so that the ON period of the switching transistors is elongated when said controller determines based on an error detection amplification signal that the load-side output direct current has increased, and the ON period of the switching transistors is shortened when said controller determines based on the error detection amplification signal that the load-side output direct current has decreased, in the condition in which the switching frequency is kept constant. A driver selecting portion selects, according to the load-light/heavy detection signal, at least one switching transistor to be activated, from among the plurality of switching transistors, and supplying the load control signal to the thus-selected at least one switching transistor.

According to the present invention, a material having a light-shielding property is used for a bank layer surrounding the edge of a light-emitting element. Accordingly, light which is not reflected by an object to be read out can be prevented from entering an image pick-up element, and information on the object to be read out can be correctly read out. The display device mounted with a read function according to the present invention includes a thin film transistor and an image pick-up element over a substrate having an insulating surface, an insulating layer covering a thin film transistor and an image pick-up element, a light-emitting element provided over the insulating layer, and a bank layer having a light-shielding property surrounding the edge of the light-emitting element. The bank layer has an opening portion in a position overlapping with the image pick-up element.

The invention relates to a smart micro-grid system. The smart micro-grid system comprises a local control layer, a network communication layer, a master station layer and a software layer, wherein the local control layer is in communication with the master station layer through the network communication layer, and the master station layer is in communication with the software layer through an information interaction bus. The smart micro-grid system integrates photovoltaic power generation, wind power generation, multiple types of energy storage systems multiple in capacity and modern power electronic, communication and control technologies. While high-reliability power supply is achieved, optimized allocation of renewable energy resources and high-reliability power supply to loads in a micro-grid are achieved; the interaction relation between the micro-grid and an external power grid is reflected correctly, and the effect of distributed energy on improvement of power supply reliability is fully shown; operation data of photovoltaic, wind power and energy storage systems and the micro-grid systems can be collected and stored, and the operation data are accumulated for researches on key technologies about micro-grids. The smart micro-grid system solves the problems that an existing micro-grid system is low in energy utilization ratio and poor in environmental benefit, electric energy quality and power supply reliability.

An object is to provide a power feeding system and a power feeding method which are more convenient for a power feeding user at the power receiving end, without causing increases in complexity and size of devices. An object is to provide a power feeding system and a power feeding method which also allow a power feeding provider (a company) which feeds power (at the power transmitting end) to supply power without waste. A power feeding device which wirelessly supplies power to a power receiver detects the position and the resonant frequency of the power receiver by receiving a position and resonant frequency detection signal using a plurality of sub-carriers having different frequencies from the power receiver, and controls the frequency of a power signal to be transmitted to the power receiver on the basis of the information. An efficient power feeding service can be offered by transmitting a power signal to the power receiver at an optimum frequency for high power transmission efficiency.

Battery system with multiple electrochemical cell types, wherein one cell type(s) (e.g., aqueous electrochemical cells) provides overvoltage protection for other cell type(s) (e.g., lithium ion superpolymer electrochemical cells). Battery system for a BPV with interchangeable modules of two or more 1:1 replaceable types, wherein each type of module has a different type, or combination, of electrochemical cells. For example, one battery module type may contain aqueous cells suitable for overvoltage protection and high power operation, while another battery module may include lithium ion superpolymer cells for their large capacity and high energy density. Use of lithium ion superpolymer electrochemical cells in low speed battery powered vehicles.

Disclosed herewith a multi-functional power storage and supply device for providing power to a variety of portable electronic devices includes a housing having a battery mounting surface. A battery pack is electrically and detachably attached to the battery mounting surface of the housing. At least one rechargeable battery is disposed within the battery pack, and is provided with a pair of outputs. A power charging circuit connectable to an external power source is arranged to charge the rechargeable battery with a charging voltage via a charging circuit once the device is connected to a power source. And at least one USB port is connected to the power charging circuit, and which is in turn connected to the outputs of the battery via a boosting circuit for charging an electronic device coupled thereon with the external power source or the power stored in the battery.

A wireless power feeding system includes a power feeding device and a power receiving device. The power feeding device includes a first resonance coil connected to a high-frequency power source through a first matching circuit, and a first control circuit connected to the first matching circuit and a first transmitter-receiver circuit. The power receiving device includes a second resonance coil configured to be in magnetic resonance with the first resonance coil, and a second control circuit connected to a load, a second matching circuit, and a second transmitter-receiver circuit.

The invention relates to a power generation device following up a spindle of a propeller and belongs to the field of propeller monitoring and piezoelectric generation. First fixed magnets and a bearing are embedded on a bearing seat, the spindle of the propeller is mounted on the bearing seat through the bearing, a first limit ring, a piezoelectric transducer and a second limit ring are sequentially mounted on a spline of the spindle, a magnet frame is fixed on the side wall of the bearing seat, second fixed magnets are embedded on the inner side of the bottom end of the magnet frame, magnetic poles of each two adjacent second fixed magnets are opposite in direction, and the first fixed magnets and the second fixed magnets are the same in number and are mounted with like poles opposite. The power generation device following up the spindle of the propeller has the advantages that the piezoelectric transducer in rotation is forced to be in bending deformation axially by the aid of the convex curved surfaces of the limit rings and under the action of magnetic force coupling, deformation and power generation are unaffected by the rotation state, and power generation can be achieved when the spindle rotates at a uniform speed and at a high speed; and all point stress is equal when the piezoelectric transducer is in bending deformation.

The present invention discloses safe deduster equipment. The equipment comprises a seat body and an electrical connector in matched connection with the seat body. The periphery of the back side of the seat body is fixedly provided with vertical feet and the vertical feet are provided with universal wheels. The middle end of the lower end surface of the seat body is provided with an insertion opening with a downward port. Inside the seat body, the left and right ends of the insertion opening are respectively, mutually and symmetrically provided with left and right turning grooves configured to extend upwardly. A driving cavity is communicated with the upper parts of the left and right turning grooves. A left locking piece and a right locking piece are respectively arranged inside the left turning groove and the right turning groove. The safe deduster equipment is simple in integral structure, and safe and reliable in whole operation. The problem in the prior art that an electrical connector of a deduster is easily loosened during movement can be effectively solved. The entire equipment is simple and convenient to use and operate, and suitable for popularization and use.

The invention discloses a smart factory-based multi-function data acquisition device, acquisition system and method. The acquisition device comprises a microprocessor as well as a power supply module, a 485 transceiver chip, a 232 transceiver chip, an IO signal conversion circuit and two Ethernet protocol stack chips which are connected with the microprocessor, wherein the 485 transceiver chip and the 232 transceiver chip are respectively provided with an RS-485 Interface and an RS-232 interface which are used for connecting external devices and acquiring device data, the Ethernet protocol stack chips are provided with Ethernet interfaces and are used for connecting upper computers or other acquisition devices and transmitting data, and the IO signal conversion circuit is provided with an IO port and is used for connecting external devices, acquiring signals or controlling the devices. The data acquisition device can be configured to a master station mode or a slave station mode, and is flexible in interfacing, and therefore, the data acquisition device can read data of field devices and scattered acquisition points more economically, conveniently and efficiently and provide complete and accurate bottom data for the establishment of a smart factory.

A method and apparatus for managing one or more grid supplied and separately metered power services, backup power sources, transfer switches and related powered loads using load monitoring and control which allow selectively connecting, disconnecting, limiting and controlling various loads which are powered thereby. The method and apparatus include operating with a system with a dual revenue meters providing grid power, a backup power source and a dual transfer switch wherein the power capabilities of each are economically sized while allowing reliability and convenience in selecting and powering loads. The connections to power sources and control of the loads powered thereby take into account various parameters including cost of power, load handling capability, type of load, load size, environmental factors, load usage during and subsequent to load connection, load priority and operator wishes.

An electrical storage device incorporating embodiments of the invention is capable of converting and/or storing energy provided by light-radiation and ancillary power sources for use intended to provide electrical charge to battery operated and Mobile Electronic Devices. The preferred embodiment of the invention exhibits a form of a Wrist-Worn Device comprising of a Battery-Bank, Photovoltaic Array and Controller. Typically in the form of a Flexible Wrist-Worn Recharging Device, the preferred embodiment of the invention may be an independent device connected to battery-operated devices such as a Mobile Electronic Device as needed, or otherwise integrated with exiting Mobile Electronic Devices to provide augmented battery life.

The invention belongs to the field of electrical engineering and particularly relates to a fault distance measuring method for a non-parallel-state uplink and downlink traction network where partitions are located in a high-speed rail power supply traction network. The method is used for judging fault types and directions in the state and accurately positioning fault points. According to the method, an uplink and downlink current ratio is defined, fault distance determining is performed according to the uplink and downlink current ratio fault distance measuring principle and the reactance method, and therefore the problem that distance measuring of the non-parallel-state uplink and downlink traction network where the partitions are located cannot be performed by an existing fault distance measuring system is solved. Meanwhile, uplink and downlink faults and the fault types cannot be accurately judged, correct fault distances are given out, the fault points can be fast found out, and fast power supply restoration of the high-speed rail power supply traction network can be guaranteed.

Provided is a power distribution system for improving reliability of power supply to the load in a case where a bidirectional DC/DC converter is connected to one power supply when making a power supply redundant, connecting a first battery and a second battery so as to supply power to a load, including: a bidirectional DC/DC converter detecting an output of the first battery and an output of the second battery, and controlling charge and discharge operation of the second battery: and a control unit detecting the output voltage of the first battery and the output voltage of the second battery, and determining from which one of the first battery and the second battery power should be supplied to the load based on detection results by the control unit and the bidirectional DC/DC converter.

A power supply apparatus includes a front-stage power circuit, a bus capacitor, a standby power circuit, a standby power circuit, an auxiliary switching circuit and a controlling unit. The auxiliary switching circuit is electrically connected between the bus capacitor and the standby power circuit. The controlling unit is electrically connected with the auxiliary switching circuit and the front-stage power circuit for controlling operations of the front-stage power circuit and the auxiliary switching circuit. When the input voltage is normal but the front-stage power circuit is disabled, the auxiliary switching circuit is turned off under control of the controlling unit, so that electric energy of the input voltage is transmitted to an input terminal of the standby power circuit through the protecting circuit.

The invention pertains to a wheel drive system for an aircraft that features at least one electric motor and at least one fuel cell as energy source for the electric motor, wherein the electric motor is coupleable to at least one wheel of at least one landing gear of the aircraft. The inventive wheel drive system reduces the fuel consumption and lowers the emission of CO₂ and pollutants—primarily carbon monoxide and unburned hydrocarbons. Persons, vehicles and other aircraft furthermore are not endangered by a jet blast while the aircraft is taxiing because the main engines do not have to be started until the take-off and landing strip is reached. The operation of the inventive wheel drive system furthermore leads to a reduced noise pollution.

An object is to provide a power feeding device, a power feeding system, and a power feeding method which are more convenient for a power feeding user at the power receiving end. The power feeding device includes a means of controlling a frequency of a power signal transmitted to a power receiver, based on a proportion of signals, among power signals output to an antenna circuit, that return from the power receiver to the antenna circuit without feeding power to the power receiver.

A power feeding device which wirelessly supplies power to a power receiver receives a position and resonant frequency detection signal from the power receiver, detects the position and the resonant frequency of the power receiver, and controls the frequency of a power signal to be transmitted to the power receiver on the basis of the information. As the power signal for power transmission, two signals having different frequencies, which are generated using a mixer by mixing a base carrier (a first signal) with a conversion carrier (a second signal) generated on the basis of the resonant frequency, are used.

The invention provides an active scheduling model and scheduling system with least wind curtailment wherein the scheduling system comprises a power generation set role assignment module, a rolling scheduling module, a real-time scheduling module and an AGC control module. The active scheduling model with the least wind curtailment is applied to the real-time scheduling module. According to the real-time wind power forecast result, the power generation requirement can be corrected in real time so as to correct the effort plan of all power generation sets in the remaining period, to enable that the overall effort of the power generation sets to be gradually close to the actual power generation requirement, to reduce the uncertainty faced by the current plan and to ensure that the effort plan of the power generation sets are more proper and of more significance.