12554 results about "AC power" patented technology

An overvoltage output protector is electrically connected to a constant-voltage switching power supply which includes a switching transistor converting a DC voltage obtained by smoothing an AC voltage supplied from an AC power source into a cyclic pulse signal. In the overvoltage output protector, an overvoltage monitor whether a potential of the cyclic pulse signal is a predetermined value or more. A deactivator turns off the switching transistor in a case where the overvoltage monitor judges that the potential of the cyclic pulse signal is the predetermined value or more.

A drilling device prevents recurrence of an overload condition after occurrence of the overload condition, thereby improving operability and safety in the drilling device. A motor for rotating a drill is connected to an AC power source through a motor control unit, a current detector, and a power switch. A magnet is also connected to the AC power source through the power switch and a full-wave rectifier. The motor control unit rotationally drives the motor on the basis of a signal sent from a main control unit according to a state in which a motor start switch is on. The main control unit controls the motor control unit to gradually reduce a supply voltage to the motor when the motor becomes overloaded, to gradually increase the voltage to the normal power supply condition when the overload condition is vanished, and to stop power supply to the motor if the overload condition continues for a predetermined period.

A method of adding a device to an existing or new electrical or electronic automation or multimedia network. The invention facilitates adding a device to the network that can communicate using various protocols such as LonWorks, CEBus, X-10, etc. over media such as AC power line, IR, RF, twisted pair, optical fiber, etc. The method is a mechanism for adding a device to a system that can be used by an ordinary user of network capable electrical devices. The method comprises the steps an installer would perform including the handshaking that needs to occur between devices to accomplish the binding process. A Functional Profile for LonWorks networks is given as an example. This includes a Home Device profile that employs an automated explicit type messaging for all devices intended for use in a home environment. The invention includes adding to the device an install button and a visual indicator for status such as an LED. Alternatively, existing buttons and LEDs on the device may be used for installed and binding purposes. Other methods of binding can be employed by the use of wired or wireless handheld tools, remote controls, etc. Other interfaces and user feedback can be used such as touch screen, personal computers, cellular phones, PDAs, etc which can offer simple ‘virtual’ binding by the press of an icon versus the physical button on the device. The binding can be performed locally or remotely such as via LAN, WAN, Internet, etc.

A pair of plasma beam sources are connected across an AC power supply to alternatively produce an ion beam for depositing material on a substrate transported past the ion beams. Each plasma beam source includes a discharge cavity having a first width and a nozzle extending outwardly therefrom to emit the ion beam. The aperture or outlet of the nozzle has a second width, which second width is less than the first width. An ionizable gas is introduced to the discharge cavity. At least one electrode connected to the AC power supply, alternatively serving as an anode or a cathode, is capable of supporting at least one magnetron discharge region within the discharge cavity when serving as a cathode electrode. A plurality of magnets generally facing one another, are disposed adjacent each discharge cavity to create a magnetic field null region within the discharge cavity.

A thermostat includes an improved user interface, including automatic scheduling, remote control, system failure warning messages, and Energy Star compliance messages. Diagnostics can be provided without additional communication links to the thermostat. A sub-base accepts multiple thermostats and uses color coded terminals to ease installation. Glow-in-the dark features reduce power needs. In one embodiment, thermostats are coupled to AC power sources and communicate using wireless communications to control an HVAC system. A dampered system can be effected through a thermostat that communicates directly with zoned dampers.

Disclosed is a power transmission system for wirelessly powering a power harvesting device. The system comprises at least one RF power transmitter. The system includes an AC power grid, or a DC grid to which the transmitter is electrically connected. Also disclosed is an adjustable RF power transmitter for powering wirelessly an RF power harvesting- device. Also disclosed is a power transmission system for wirelessly powering an RF power harvesting device. The system can include a computer with an antenna or a lighting fixture or a light or a battery charging unit or a battery. Also disclosed is an apparatus for wirelessly powering a power harvesting device. Also disclosed is a method for wirelessly powering a power harvesting device.

A device, network and method wherein a standard wireless modem is coupled to wiring for carrying a wireless baseband signal that may be OFDM based, and may be directly generated by the wireless IF modem, or extracted from the modem RF signal. The wiring may be a building utility wiring, such as telephone, AC power or CATV wiring. The baseband signal is carried simultaneously with the utility service signal over the utility wiring using Frequency Division Multiplexing. The device may be enclosed with a data unit, a standalone dedicated enclosure, within an outlet or as a plug-in outlet adapter. Data units may couple the device by a wiring port such as standard data connector, or via wireless connection. The device may be locally powered or via a power signal carried over the wiring. This abstract is not intended to limit or construe the scope of the claims.

A system and method of home entertainment, security, surveillance, and automation control includes a plurality of remote devices, a display device, and various user input devices capable of receiving a home user's commands. The system further includes a main control unit capable of controlling and programming the system, and a communication link capable of transferring various data and control signals between the main unit and the plurality of remote devices. The home user's command enables to select the remote devices, to transmit various automation control signals, and to establish exchanges of various data between the main control unit and at least one of the plurality of remote devices. Finally, the communication link between the main control unit and the remote devices includes power line communication network over existing home AC power line. The home user is also able to control and communicate with the system at remote location over the Internet.

An thermostat 10 includes an improved user interface, including automatic scheduling, remote control, system failure warning messages, and Energy Star compliance messages. Diagnostics can be provided without additional communication links to the thermostat. A sub-base accepts multiple thermostats and uses color coded terminals to ease installation. Glow-in-the-dark features reduce power needs. In one embodiment, thermostats are coupled to AC power sources and communicate using wireless communications to control an HVAC system. A dampered system can be effected through a thermostat that communicates directly with zoned dampers.

Solar power systems and structures are mountable to a power distribution structure, e.g. a power pole or tower, which supports alternating current (AC) power transmission lines. An exemplary power generation structure is fixedly attached to and extends from the power distribution structure, and comprises a mounting rack. A solar array, comprising at least one solar panel, is affixed to the mounting rack. A DC to AC invertor is connected between the DC outputs of the solar array and the AC power transmission lines. The length of the solar array is generally in alignment with the power distribution structure, and the width of the solar array is greater than half the is circumference of the power distribution structure. The mounting rack and solar array may preferably be rotatable, such as based on any of location, time of day, or available light.

A system and methodology for intelligent power management of wirelessly networked devices. The system provides for reliable wireless communication via a wireless power charging method and, a method to maintain power capacity of batteries in a wireless device. The batteries are charged via an RF harvesting unit embedded inside the wireless device. An intelligent wireless power charging system further comprises at least two batteries and at least two RF adaptor devices coupled to an AC power line. The first adaptor is set for data communication while the second adaptor is used to transmit the power. In addition, when a first battery is in use during active mode, the second battery is subjected to wireless charging.

A synchronous bi-directional active power conditioning system (11) suitable for wide variable frequency systems or active loads such as adjustable speed drives which require variable voltage variable frequency power management systems is disclosed. Common power electronics building blocks (100, 200) (both hardware and software modular blocks) are presented which can be used for AC-DC, DC-AC individually or cascaded together for AC-DC-AC power conversion suitable for variable voltage and / or wide variable frequency power management systems. A common control software building block (2, 5) includes a digital control strategy / algorithm and digital phase lock loop method and apparatus which are developed and implemented in a digital environment to provide gating patterns for the switching elements (3, 6) of the common power-pass modular power electronics building blocks (100, 200).

A power distribution system / method implementing Internet based access to hybrid home automation networks is disclosed. The system utilizes a smart gateway power controller (SGPC) configured for single / multi-gang wallplate installation to selectively switch an AC power source to a load device under switched control and / or local / remote network commands that may be routed through a variety of network interfaces and protocols present within a home or other structure-local communications network. SGPC configurations may be nested within a home automation network to permit separation of control for load devices within a common home automation environment. Present invention methods may include routing protocols between disparate home automation networks as well as remote access protocols that permit control of disparate home automation networks via the Internet using a wide variety of remote access interfaces including mobile devices, tablet computers, laptops, desktop computers, and the like.

A single-chip integrated LED particularly adapted for direct use with a high voltage DC or AC power sources comprises a plurality of electrically isolated LEDs on a generally transparent substrate and bonded to electrically conductive elements on a thermally conductive mount. A reflective coating may be applied to the area between LEDs.

An AC LED package and circuits are disclosed along with an AC LED driver. The AC LED circuit may include as few as one LED or an array of anti-parallel LEDs driven with AC power sources and AC LED drivers at various voltages and frequencies. The AC LEDs are pre-packaged in various forms and materials and designed for mains or high frequency coupling in various forms to AC power sources, inverter type drivers or packages. The AC LED driver is a fixed frequency driver that provides a relatively constant voltage output to different size loads within the wattage limitation of the driver and in some cases is a direct mains power source.

The invention disclosed herein is a dynamic dummy load to allow a phase control dimmer to be used with LED lighting. The invention includes providing a dynamic dummy load to provide a load to the dimmer when the LED electronics do not provide sufficient load due to start up issues or ringing in the circuit, the dynamic dummy load providing a reduced flow of current when the LED and its converter electronics provide sufficient current draw from the dimmer. The system generally includes a power source electrically connected to a phase control dimmer, the phase control dimmer electrically connected to converter circuitry to convert the AC power output of the dimmer to DC power output for powering the LED lighting, a dynamic dummy load electrically connected in parallel with the converter circuitry, the dummy load varying its current draw in response to operation of the converter circuitry.

To provide an induced power transmission circuit that transmits, from a transmission antenna (1) connected to a power supply circuit, an AC power having an angular frequency ω to a spaced reception antenna (2) with an excellent efficiency, thereby transmitting it to a load circuit. The induced power transmission circuit comprises a circuit the two ends of which are coupled by a capacitor (C1) and in which the power supply circuit is connected in series to a midway port (1) (P1) of the transmission antenna (1) having an effective self-inductance L1; and a circuit the two ends of which are coupled by a capacitor (C2) and in which the load circuit is connected in series to a midway port (2) (P2) of the reception antenna (2) having an effective self-inductance L2; wherein for a coupling coefficient k of the electromagnetic induction between the antennas and for a phase angle β having an arbitrary value, the angular frequency ω is set to the square root of the reciprocal of a value of L2×C2×(1+k*cos (β)), the output impedance of the power supply circuit is set to approximately kωL1*sin (β), and the input impedance of the load circuit is set to approximately kωL2*sin (β). There is also provided an impedance converting circuit that converts the circuit impedances.

A charging system for simultaneously charging the batteries of a plurality of battery powered vehicles. The charging includes one or more DC-DC power converters having one or more charging ports configured to plug into the batteries. The DC-DC power converters are each configured to selectively connect to more than one charging port to selectively provide for higher port power levels. The DC-DC power converters connect to an AC rectifier through a DC bus. The AC rectifier connects to an AC power source having a limited power rating. The AC charging system also has a controller that controls the operation of the DC-DC power converters such that the total power draw on the AC rectifier does not exceed the power rating. The system is further configured such that the DC-DC power converters can drain selected batteries to obtain power for charging other batteries, thus allowing for batteries to be cycled.

A novel integrated rectifier and boost converter circuit architecture is disclosed. The rectifier architecture includes a plurality of identical half-bridge rectifiers connected to receiving antennas to convert wireless AC power into DC power. The integrated rectifier may be coupled in series with a charging inductor in a boost converter. The inductor may discharge upon operation of two micro-controller-driven switching transistors using predetermined threshold and timing scheme to turn on / off. The rectifier architecture may provide high power densities, improve efficiency at larger load currents, and may be enabled in an integrated circuit with eight RF signal inputs, eight half-bridge rectifiers, and eight DC outputs ganged together as single feed into the boost converter. The rectifier circuit topology may include a comparator driven by the boost controller with a proprietary algorithm which suits control for a maximum power point tracking functionality, and an external micro-controller for additional control of the boost converter.

The object is to reliably detect a ground fault of a solar battery. To detect a ground fault position to take an efficient measure against the ground fault, DC power input from a solar battery is converted into AC power and supplied to a system. In a system interconnection inverter (utility connected inverter) having non-insulated input and output, the input voltage of a converter circuit and / or the intermediate voltage between the converter circuit and an inverter circuit are varied to control the potential to ground at each portion of the solar battery to a value other than a value close to zero.

A wireless power system capable of transmitting power through the skin without percutaneous wires over distances ranging from a few inches to several feet includes an external transmitting coil assembly and a receiving coil assembly. The transmitting coil assembly includes an excitation coil and transmitting resonant coil which are inductively coupled to each other. The receiving coil assembly includes a receiving resonant coil and a power pick-up coil which are also inductively coupled to each other. A high frequency AC power input, such as radio frequency (RF), supplied to the excitation coil inductively causes the transmitting resonant coil to resonate resulting in a local time varying magnetic field. The transmitting and receiving resonant coils are constructed as to have closely matched or identical resonant frequencies so that the magnetic field produced by the transmitting resonant coil is able to cause the receiving resonant coil to resonate strongly also, even when the distance between the two resonant coils greatly exceeds the largest dimension of either coil. The receiving resonant coil then creates its own local time varying magnetic field which inductively produces a voltage in a power pick-up coil to provide power to an active implantable medical device or implantable rechargeable battery.

An apparatus and method of control for converting DC (direct current) power from a solar photovoltaic source to AC (alternating current) power. A novel DC-to-AC power converter topology and a novel control method are disclosed. This combination of topology and control are very well suited for photovoltaic microinverter applications. Also, a novel variant of this control method is illustrated with a number of known photovoltaic DC-to-AC power converter topologies. The primary function of both control methods is to seek the maximum power point (MPP) of the photovoltaic source with novel, iterative, perturb and observe control algorithms. The control portion of this invention discloses two related control methods, both an improvement over prior art by having greatly improved stability, dynamic response and accuracy.

A method to convert direct current (DC) power generated by a photovoltaic (PV) arrays to alternating current (AC) power using a PV inverter, the method includes: applying the DC power generated the PV array to the PV inverter; boosting the DC power from the PV array from a predetermined voltage level to a predetermine DC link voltage, wherein the PV array is regulated by the boosting to output a voltage at the predetermined voltage level; converting the boosted DC power to AC power, and disabling the boost of the power generated by the PV array after the array has a predetermined voltage level at least as great as the DC link voltage.

A power supply with AC and DC back-up power has a rectifier, a rechargeable battery, a charger, a detecting circuit, a first DC / DC converter and a DC / AC converter. The rectifier is coupled to the power of the wall-socket for generating a first power. Moreover, the rechargeable battery is charged by the first power through the charger, and the detecting circuit detects a power-supplying condition of the wall-socket. The first DC / DC converter is used to convert a power of either the battery or the first power to a second power, and the DC / AC converter converts a power of the battery into AC power.

A galvanic isolated DC-DC and DC-AC power conversion system is coupled to a plurality of DC sources which are derived from a combination of a plurality of single-phase and three-phase AC-DC converters. The DC-DC and DC-AC power conversion system in one embodiment is configured to provide mixed type outputs (mixed frequency, e.g. DC with 50 or 60 Hz, with 400 Hz; mixed voltage levels).

A method and system for the reception, conversion and distribution of wireless communication signals received from such communication devices as PCS, Cellular, and Satellite over AC power lines commonly found within a building, office, home or other structure is disclosed. This invention specifically provides for the distribution of wireless signals in structures where otherwise signal degradation and / or blockage are common. Moreover, this invention takes advantage of the existing AC power lines to create a communication channel avoiding the necessity of rewiring the building or other structure. This invention provides important improvements to the signal coverage and reception of wireless transmitted signals within buildings and other structures and does so in an efficient and cost effective manner.

A ground fault detector and interrupter for a photovoltaic (PV) energy conversion system, method and apparatus are disclosed. In an exemplary embodiment, the system includes first and second inputs adapted to couple to a first and second rails of a PV array. An inverter is configured to convert DC power generated from the PV array to AC power. A ground fault detector and interrupter, which is coupled to the first and second rails and to the inverter, is configured to detect ground fault conditions in the PV array and to decouple the PV array from the remaining portion of the PV energy conversion system upon such detection. A known signal is coupled to the input of the ground fault detector and interrupter, and then sensed at the output of the ground fault detector and interrupter to determine whether components of the ground fault detector and interrupter are operating properly.

A solar photovoltaic plant is disclosed where a number of distributed DC-to-DC converters are used in conjunction with a central DC-to-AC converter. Each DC-to-DC converter is dedicated to a portion of the photovoltaic array and tracks the maximum power point voltage thereof. The DC-to-DC converters also boost the photovoltaic voltage and regulate a DC output current for transmission to the central DC-to-AC converter. Five distinct advantages are had over the prior art. First, efficiencies in intra-field power collection are greatly improved by transferring power at higher DC voltages. Second, the number of independent photovoltaic maximum power point trackers in the power plant can be increased, in a cost effective manner, to optimize the overall photovoltaic array energy harvest. Third, each DC-to-DC converter output “looks” like a current source at the input of the DC-to-AC converter and therefore can be easily paralleled. Fourth, the current source nature of the DC-to-DC converter outputs enables the DC-to-AC converter to operate with a minimum, fixed DC bus voltage to provide maximum DC-to-AC power conversion efficiencies. And fifth, each distributed DC-to-DC converter can isolate a faulted portion of the photovoltaic array while the remainder of the array continues producing power.