4092 results about "Mains electricity" patented technology

This invention is generally concerned with power supply circuits, and more particularly, with circuits to supply power to a mains supply, such as domestic grid mains, from a photovoltaic device. A photovoltaic power conditioning circuit for providing power from a photovoltaic device to an alternating current mains power supply line, the circuit comprising: a DC input to receive DC power from said photovoltaic device; an AC output configured for direct connection to said AC mains power supply line; a DC-to-AC converter coupled to said DC input and to said AC output to convert DC power from said photovoltaic device to AC power for output onto said power supply line; and an electronic controller directly coupled to said power supply line to measure a voltage of said power supply line and a current in said supply line and to control said DC-to-AC converter responsive to said measuring.

A lighting monitor/control system for remote billboards uses a cellular network to provide utility power and light status information to a central controller, which in response provides control signals to individual remote billboard lighting controllers for setting operating parameters such as multiple on/off times, lighting power adjustments for individual billboards, and custom lighting schedules based upon geographic and environmental considerations. Battery back-up is provided in the event of utility power outage with automatic reversion to utility power when restored. Immediate notification of failure of utility power or of individual lamp or ballast failure is provided by SMS messaging formatted so as to minimize the number of messages and reduce communications costs. The monitor/control system is also adapted for use in remote power monitoring applications to automatically switch to standby power (generator) in the absence of primary power and to return to primary power when restored.

The invention relates to a lawn lamp with commercial power output and radio functions. The lawn lamp comprises a lamp pole body, a light source window, a fixed base, a radio module, a loudspeaker, a standard socket and a switch, wherein the light source window is arranged around the lamp pole body, highly-transparent tempered glass is mounted on the light source window, the fixed base is arranged at the bottom of the lamp pole body, the radio module is mounted at the top of the lamp pole body, the loudspeaker is mounted on one side surface of the lamp pole body in an embedded manner, the standard socket is mounted on the side surface of the lamp pole body in an embedded manner, and the switch is mounted on the side surface of the lamp pole body in an embedded manner. The product provided by the invention has not only a lighting function but also the radio listening and commercial power output functions, so as to achieve multiple purposes.

The invention discloses a medical appliance carrying apparatus which comprises a working table. A vertical slide rail is arranged on one side of the upper surface of the working table; an electric trolley is arranged on the vertical slide rail and provided with a mount on the upper surface; a circular groove is formed in the center of the upper surface of the mount; a rotating motor with an upward rotating end is arranged in the circular groove; the rotating end of the rotating motor is provided with a circular supporting plate matched with the circular groove; a first installation box is arranged on the upper surface of the circular supporting plate; a controller is arranged on the front surface of the working table; a mains supply interface is arranged on the back surface of the working table; a power terminal of the controller is connected with a mains supply interface via a conductor wire; an output end of the controller is connected with the electric trolley, the rotating motor, a hydraulic cylinder, an electric pusher and a micro linear motor via conductor wires respectively. The medical appliance carrying apparatus has the advantages of high carrying capacity, high carrying speed, capability of liberating manpower and improving work efficiency, small size, and high movability.

A power fault diagnostic mechanism for a computer system having a power system that includes a controller. A variable is recorded in a non-volatile memory associated with the power system. The variable assumes a first state when the computer system is powered on and operating. The variable remains in the first state until it enters a second state when the computer system is powered off in response to a power-off request. The controller operates in a standby mode when the computer system is powered off. Upon being powered up, e.g., after a utility power disturbance, the controller reads the variable in the non-volatile memory. This allows determination of whether a disturbance has occurred, even when the computer system was powered off. The controller maintains a local error log based on the variable accessed from the non-volatile memory. A system error log is updated by the operating system using the local error log.

The present invention relates to a photovoltaic three phase synchronization control method realizing maximum power tracking swiftly and stably, which belongs to the technical field photovoltaic power generating control. The method includes the steps as follows: judging the DeltaP/DeltaV value according to the power difference DeltaP between the current time k and the previous time and the voltage difference DeltaV; working out the Iref(k) when the photovoltaic array produces the maximum power; using the Iref(k) to adjust the uq* under the coordinates in vectorial synchronous rotation with the electric network voltage; acquiring six ways of space vectorial SVPWM impulse series according to the rotation angle degree Theta of the three phase electric network voltage, with the aim to control the inverter in order to ensure that the output current of the photovoltaic inverter has the same phase position as that of the mains voltage while ensuring the photovoltaic array is realizing the maximum power output tracking. The power factor is 1. The present invention also can adjust the Idref(k) according to local load requirements, therefore achieving adjustment to the power factor, with low synchronization current harmonic wave distortion factor.

The invention relates to an LED power circuit comprising a bridge rectifier circuit, a driving circuit, a transformation rectification circuit, a switch circuit, a feedback circuit and an LED light-source circuit. The bridge rectifier circuit is used for rectifying AC power input by commercial power; the driving circuit is used for keeping the LED power circuit connecting to a traditional dimmer to work normally; the transformation rectification circuit is used for providing working current for the LED power circuit under the control of the switch circuit; and the feedback circuit feeds back a working voltage to the switch circuit from the transformation rectification circuit.

An uninterruptible power source (UPS) for supplying power to a barrier operator when mains power has failed is disclosed. The UPS includes a UPS controller for detecting and responding to a mains power failure and capable of generating a plurality of control signals. A backup power source and an up-converter is connected to the UPS controller, wherein the up-converter increases the voltage of the backup power source when needed. A switch is responsive to one of the plurality of control signals of the UPS controller and toggles the operator barrier between the up-converter and the mains power source, and awakens the operator via a standby receiver power line. Another embodiment awakens the operator anytime a UPS receiver receives a preamble of a wireless transmission signal. Auxiliary lighting may also be associated with the UPS and/or photo-electric safety devices.

The invention relates to a communication fuel cell spare power supply system, which comprises a hydrogen generation and storage unit, a fuel cell unit, a DC/DC unit, an output unit, an electric control unit, a routing inspection unit, a monitoring unit and a communication unit, and is characterized in that: the hydrogen generation and storage unit generates hydrogen by using solar or wind energy and releases the hydrogen by absorbing the heat of the fuel cell unit; the fuel cell unit generates direct current electric energy and heat by the electrochemical reaction of the hydrogen and oxygen; the DC/DC unit adjusts and boosts the direct current electric energy and then supplies the direct current electric energy to the output unit; the output unit supplies power to a load when commercial power fails; the electric control unit acquires various data and sends control information to all units; the routing inspection unit acquires all individual cell voltage values for transmission; the monitoring unit displays various parameters and working states and realizes human-computer interaction; and the communication unit performs short-range and long-range communication and monitoring. The power supply system is clean, high efficient, reliable and applicable to various communication spare power supplies.

The invention discloses a switching apparatus of a UPS power supply. The apparatus comprises a commercial power supply module, an external power supply module, a cell power supply module, a cell charging module, a MCU control module, a switching control module and a host power supply output module. According to the apparatus of the invention, the MCU control module is used to monitor working states of the commercial power supply module, the external power supply module, the cell power supply module and the cell charging module in real time and synchronously carry out power-down waveform identification and peak value voltage detection. When the commercial power supply is performed, the host power supply output module is controlled to carry out voltage reduction on the commercial power so that the commercial power is converted into a reference power supply and is output. When the MCU control module determines that the commercial power is off through the power-down waveform identification and the peak value voltage detection, a switching instruction is output to the switching control module so that the switching among the commercial power supply module, the external power supply module and the cell power supply module is realized. Alternating current power down can be accurately identified in a short time and a switching signal is provided timely. A UPS multipath priority switching requirement is reached.

A soft-load power distribution system includes a transfer switch having a first input to a utility power source with a utility alternating current (AC) voltage, a second input to a generator power source with a generator AC voltage, and an output to a load. A first switch is electrically connected between the first input and the output and a second switch is electrically connected between the second input and the output. The transfer switch has a third input, such as a go to emergency input, controlling the first and second switches. A bypass switch is electrically connected between the second input and the output. First and second sensors, such as potential transformers, sense the utility and generator AC voltages, respectively. A controller closes the bypass switch when the utility AC voltage is within a predetermined range of the generator AC voltage, and includes an output controlling the third input.

A main generator delivers an AC voltage to an electricity network on board an aircraft via a main line having at least one line contactor mounted therein, the voltage being regulated by a regulator. An engine electricity network delivers electricity to various loads situated in the zone of an engine fitted to the aircraft and to an engine control computer, the engine electricity network having a first fed input connected to the main electricity power supply line via a secondary electricity power supply line, upstream from the line contactor in order to receive directly electricity derived from the main generator without transiting via the electricity network on board the aircraft. The voltage regulator regulating the voltage delivered by the main generator may be situated in the engine zone and is powered by the engine electricity network.

A cascaded switching power converter for coupling a photovoltaic (PV) energy source to power mains provides a high-efficiency and a potentially simple control mechanism for AC solar energy conversion systems. The PV energy source charges a capacitive storage element through a DC-DC converter, and an inverter couples energy from the capacitive storage element to the mains supply. The DC-DC converter is controlled so that ripple present on the capacitive storage element due to current drawn by the inverter is not reflected at the input of the DC-DC converter, which is accomplished by varying the conversion ratio of the DC-DC converter with the ripple voltage present across the capacitor. The average voltage of the capacitor can also be increased with increases in the available power output from the PV energy source, so that a corresponding increase in power is transferred to the mains supply.

A power supply control device for supplying power to a number of electrical devices from a single mains supply electrical outlet switch means adapted to connect an electrical supply from the supply electrical outlet to each of the controlled electrical outlets in response to the state of a master electrical device, a state sensor adapted to detect a functional state of the master electrical device, said sensor being adapted to distinguish at least three functional states of the master device. The master device may be personal computer with peripheral devices connected to the controlled outlets.

An active type harmonic suppression apparatus, connected in parallel to a power feeder, supplies a compensation current for injecting into the power feeder such that a utility current of a power source is approached to a sinusoidal wave. The control circuit retrieves a load current, a utility current, an output current of the power converter, a power source voltage and a voltage of the dc power capacitor for calculating and sending a reference signal of compensation voltage to a pulse-width-modulation circuit which generates switching signals for the power converter. Furthermore, the harmonic suppression apparatus can provide a fixed or variable reactive power.

The invention discloses a power source capable of achieving seamless switching of multiple power supply modules. The power source capable of achieving seamless switching of the multiple power supply modules comprises a main power supply module, a standby power supply module, a charging battery pack and an output conversion module. The main power supply module and the standby power supply module offer input signals to the output conversion module through a first diode and a second diode respectively. The charging battery pack directly offers input signals to the output conversion module. A cathode of the first diode, a cathode of the second diode, an anode of the charging battery pack and the input end of the output conversion module are connected to the same node. According to the power source capable of achieving seamless switching of the multiple power supply modules, by the adoption of the power supply modules with different output voltages and with the combination of the switching function of the diodes, the power supply sequence is determined according to a high-low voltage rank, the power supply module with the low output voltage guarantees real continuous power output in an online standby mode, power supplied by the commercial power is preferably output and used, a mechanical switching switch of an existing UPS power source is eliminated, cost is low, the switching is conducted between the different power supply modules in sequence, and the switching time is nearly zero.