power (Total 728500 Patents Found)

A switching power supply device in which the increase in the switching frequency when the load is light is restrained, whereby the switching loss is reduced, intermittent oscillating operation is prevented, and heat generation in the main switching device at the time of short-circuiting is restrained. In a switching po...
A power-supply system involving system interconnection includes a plurality of AC modules, each of which includes a solar cell module and an inverter unit which outputs a single-phase alternating current. The AC modules are connected to the single-phase three-wire distribution line such that the number of AC modules co...
Reduced transient power dissipation and reduced variation of the transient power dissipation are obtained in high frequency power amplifiers, e.g., CRT horizontal deflection amplifiers, by sampling the amplifier output at and/or during the turning-off interval (e.g., during the storage time when transient power dissipa...
A liquid crystal display is driven so that an arbitrary pair of neighboring ones of M×N matrixed pixels in a row direction are driven by reversing a polarity of a signal potential in either thereof from that in the other thereof, an arbitrary pair of neighboring combinations of neighboring two of the M×N pixels in a ...
A charge/discharge control circuit comprises two serially connected electric power sources and two overcharge/overdischarge detection circuits. A control circuit outputs a signal for controlling the charge/discharge of the electric power sources in accordance with signals from the two overcharge/overdischarge detection...
A transmission wheel pressurizing apparatus for always supplying, in a continuously variable transmission of a constant HP transmission type, a pressurizing force and an elastic force to one out of two transmission wheels simultaneously and only a pressurizing force to the other. For securing the desired number of revo...
A method for joining metal-matrix composites (MMCs) by using high power x-rays as a volumetric heat source is provided. The method involves directing an x-ray to the weld line between two adjacent MMCs materials to create an irradiated region or melt zone. The x-rays have a power density greater than about 10 4 watts/...
A motor vehicle automatic climate control computes the HVAC power requirement for cabin air temperature regulation, and determines corresponding air discharge temperature and blower motor speed commands using a two-step table look-up procedure. Nominal air discharge temperature and blower motor speed profiles are tabul...
A regulated power supply can be derived from a battery supply input and a regulator, but in order to conserve battery power, alternative power supplies can be provided each with a switch responsive to the regulator to connect that alternative power supply to the output when it rises to the level of the battery supply....
A fluidic device having a plenum chamber, an input port to the chamber for receiving a supply of gas, and a power nozzle contiguous with the plenum chamber for generating a power jet. Means is located upstream of the power nozzle for controlling the directional flow of the power jet exiting the power nozzle. The contro...
An electric switch for a power tool, comprising: a slider slidably received in a switch casing along a longitudinal direction, a handle provided in the grip of the power tool for manually actuating the slider along the longitudinal direction; a plurality of fixed contact pieces arranged in an internal bottom surface of...
Power reception circuits employable in portable data devices (e.g., smart cards) to derive power and/or data from an input AC power signal (e.g., an ASK modulated carrier signal). In one embodiment, the power reception circuit comprises a power rectifier (120), a shunt rectifier (142) and a shunting element (132). The ...
An electric power apparatus and a power transmitting apparatus of an electric vehicle are each constructed as a unit structure to improve the overall range and reliability of the electric vehicle. In the electric vehicle including, as a power system, a battery power supply, a motor, and a controller for controlling rot...
Disclosed herein is a malfunction detection apparatus for use in an outboard engine or motor system having a tachometer. The apparatus includes a tachometer output circuit for applying the tachometer signal to the tachometer in accordance with the input signal attributing to the battery voltage or engine speed, the bat...
A switching circuit is provided to process a DC voltage and apply a low frequency AC voltage, having a trapezoidal waveform, to a co-axial cable transmitting the low frequency AC voltage to a load which may be powered by the low frequency AC voltage as well as a DC voltage. In one specific embodiment two of the switche...
A frequency converter device comprises a first converter 5 in a pulse-width modulation system for converting an AC voltage into a DC voltage; a second converter 2 in a pulse-width modulation system for supplying an AC voltage with a variable voltage and a variable frequency to a motor; a capacitor 15 connected between ...
A system for transmitting power over a direct voltage network. A first power station connects one alternating voltage network to the direct voltage network. The first power station includes a converter for bidirectionally transferring power between the direct voltage network and the alternating voltage network. The con...
In a blow-off device for limiting excess pressure in nuclear power plants, a condensation tube disposed so that a lower outlet end thereof is immersed in a volume of water in a condensation chamber having a gas cushion located in a space above the volume of water, and an upper inlet end of the condensation tube extends...
A disk drive controller having a plurality of disk drive interfaces, each interface includes a connector, a delay circuit, and a set of power application circuits is provided to a server to support hot docking of SCA drives. Each connector is adapted to mate with a hot docking disk drive having equal length connecting ...
A power attachment is attachable to a power machine which has a power circuit. The power machine also includes an operator input device receiving an operator input and providing an output signal indicative of the operator input. The attachment includes a tool and an actuator, coupled to the tool, to drive the tool. The...
In method of communicating from a terminal unit to a base unit, an incoming signal is sent from the base unit and received at the terminal unit. The terminal unit will measure the level of this incoming signal. The terminal unit may also extract digital information from the incoming signal. Based on either the measured...
An antenna system is provided which employs RF and DC coupling across a dielectric. RF coupling is achieved using low cost and low loss RF coupler pairs such as quarterwave patches that are mounted opposite each other on either side of a dielectric. The feeds of the patches are aligned so as to be directly opposite eac...
A computer system, according to an embodiment of the present invention comprises a host CPU, an image rendering device, a CRT image memory, a video subsystem, an alternative display converter, an alternative display memory, an LCD controller, a change-of-status (COS) detector, a power up/down controller, and a computer...
A cordless telephone apparatus detects the received field strength in a receive channel, as viewed from the base unit side, and if the field strength is below a prescribed level outputs an out-of-range signal on a receive channel, as viewed from the base unit side. The remote unit is provided with a volatile memory are...
Method and apparatus for high-power-density beam welding in combination with upset welding. The method comprises forming, along abutting edges of metal materials to be welded, a continuous upset weld line, and subsequently beam welding the metal materials by irradiation by a high-power-density beam along the weld line....
The switching power supply has high output power, high efficiency and fixed or variable output voltage. The input voltage may be AC or DC. Preferably, the input current is sinusoidal. Reduced peak currents of switches result in best possible line and component utilizations at any time. In one embodiment, a first ...
According to one aspect of the present invention, an apparatus is provided in which a first switching device is used to connect a first node to a second node and disconnect the first node from the second node based upon the value of a first control signal. The first node is continuously connected to a first voltage sou...
A power transformer is provided with a housing having a plurality of apertures for receipt of a bushing well of a bushing assembly. Each bushing assembly includes a bushing well adapted to be secured in one aperture of the power transformer, and a bushing adapted to be connected to a terminal in the bushing well to per...
In an electrical power distribution system, a consumer has a control unit comprising a plurality of solid state switches in supply leads to a plurality of separate load circuits, a microprocessor responsive to the magnitude of the total current drawn by the consumer from the supply and arranged to control the various s...