Class / Patent application number | Description | Number of patent applications / Date published |
307060000 | Constant load or current | 13 |
20090167088 | Method and device for preventing the disconnection of an electric power generating plant from the electrical grid - Procedures to prevent the disconnection of a park of electricity generators from a network in the event of a voltage sag, through which, upon detection of the sag, the voltage travelling to the network is controlled in proportion to the magnitude of the sag; the active power produced by the park, rather than sent to the network, is thus diverted into to storage and/or energy dissipation equipment, keeping the park voltage at a nominal level. | 07-02-2009 |
20090189449 | Power source and method for controlling operational power - The solution controls electric operational power to be fed to an amplifier. The control can be carried out, for instance, in accordance with a predetermined signal. The operational power is fed to the amplifier with a voltage source unit and a current source unit, and the operational voltage that the voltage source unit feeds to the amplifier is controlled. The current source unit feeds at least some of the operational electric current of the amplifier. | 07-30-2009 |
20090212629 | PHOTOVOLTAIC LADDER INVERTER - Techniques for DC-to-AC conversion are disclosed, and may be embodied in a solar inverter device that can operatively couple to a power grid. The device includes a photovoltaic (PV) stack including series-connected PV modules. Each PV module is associated with a capacitor for storing output of that PV module. A positive terminator circuit switches a negative end of the PV stack to ground during positive half of grid cycle, and a negative terminator switches a positive end of the PV stack to ground during negative half of grid cycle. A connecting branch couples each PV module output to a common bus, each branch including control circuitry configured to selectively couple the corresponding PV module output to bus. During a first half of grid cycle, some of the capacitors discharge to the grid while a balance of the capacitors charge in preparation for discharge during a second half of grid cycle. | 08-27-2009 |
20090251004 | SEQUENTIAL SHUNT SOLAR ARRAY CONTROLLER - A current controller for a spacecraft comprises ripple regulators and a pulse width modulated regulator. Ripple regulators receive current from associated current sources and pass current to or shunts current away from the bus. The pulse width modulated regulator receives current from another current source and passes a portion of the current to the bus. This regulator varies its set point to float between ripple regulators passing current and the ripple regulators shunting current and adjusts a portion of current that is shunted away from the bus. The current shunted by the regulators form a total shunt current. The variable set point of the pulse width modulated regulator varies as the total shunt current varies. The ripple regulator set points do not vary in this manner. An error generation circuit generates an error that adjusts the ripple regulator and the pulse width modulated regulator to a desired bus voltage level. | 10-08-2009 |
20110001360 | ANALOG MPPT CIRCUIT FOR PHOTOVOLTAIC POWER PLANT - A method of power point tracking for operating a photovoltaic power plant, which includes a DC-DC converter of the output voltage of a panel having a power switch driven by a PWM control signal of variable duty-cycle generated by a PWM control circuit, in discontinuous conduction mode or continuous conduction mode depending on the current load of the converter, is implemented by low cost analog circuits. The method does not require the use of any analog-to-digital conversion, digital processing or storage resources and may use a single voltage sensor. | 01-06-2011 |
20120119579 | CONTROLLER FOR HYBRID ENERGY STORAGE - A controller is disclosed for hybrid systems providing power to an electrical power grid. The controller reduces wear on hybrid systems by having only a fast unit tuned to track fluctuations of a regulation signal in a normal mode of operation. By contrast, the slow unit does not track fluctuations in the regulation signal in the normal mode of operation, which reduces wear on the slow unit. The normal mode of operation is defined by an energy range of the fast unit. Energy band parameters associated with the energy range can be dynamically modified in order to optimize the efficiency of the hybrid system. | 05-17-2012 |
20120169123 | STANDBY POWER SHUT-OFF OUTLET DEVICE AND A CONTROL METHOD FOR THE SAME - An outlet or multi-outlet power strip device for interrupting standby power is provided that includes at least one standby power shut-off unit, which is provided correspondingly to at least one receptacle outlet and either supplies or shuts off power to an electronic product connected to the at least one receptacle outlet depending on the status of the electronic product; an outlet power supply, which receives power from the at least one standby power shut-off unit, and converts and supplies the input power to the outlet; a mode selector, to which a selected mode on whether the outlet should be operated in independent mode or cooperative mode is input; and a controller, which sets a standby current of the electronic product, detects the power status of the electronic product by using the set standby current, and controls the at least one standby power shut-off unit according to the detected power status. | 07-05-2012 |
20120212059 | POWER SUPPLY SYSTEM WITH MULTIPLE POWER SOURCES IN PARALLEL - The present disclosure provides a power supply system. The power supply system includes a plurality of power supply devices connected in parallel. Output terminals of the plurality of power supply devices are coupled to a common supply line. Each of the plurality of power supply devices includes a DC-to-DC converter, a transformer, a switching control device, a rectifying device, and a judging device. The judging device receives a feedback voltage, an error signal and a second AC voltage to determine whether the power supply device is normal, wherein the feedback voltage is a voltage division of an output voltage on the common supply line, the error signal is an output of the switching control device, and the second AC voltage is retrieved from a second winding set of the transformer. | 08-23-2012 |
20120280569 | SUPERCAPACITOR-BASED GRID FAULT RIDE-THROUGH SYSTEM - The supercapacitor-based grid fault ride-through system provides a dynamic model of a wind generation system including a Voltage Source Converter (VSC), which functions as a Static Compensator (STATCOM). The power control capability of the STATCOM is extended by incorporating energy stored in a supercapacitor. The system implements a vector control technique based on the decoupling of real and reactive power. Simulation results show that a fixed speed induction generator is capable of withstanding a significant grid fault when aided by the supercapacitor-based grid fault ride-through system. Moreover, the induction generator regains its pre-fault status immediately after the fault is cleared. | 11-08-2012 |
20120299381 | Intelligent High Speed Automatic Transfer Switch - A transfer system may be provided. The transfer system may comprise a first transfer switch comprising first normally closed contacts and first normally open contacts. In addition, the transfer system may comprise a second transfer switch comprising second normally closed contacts and second normally open contacts. Furthermore, the transfer system may comprise third normally closed contacts with a solid state switch in parallel. A source monitor may be configured to monitor the quality of a primary source and a backup source. And a source control may be configured to operate the first transfer switch, the second transfer switch, the third normally closed contacts, and the solid state switch to transfer a load from the primary source to the backup source in response to the monitored quality of the primary source and the backup source. | 11-29-2012 |
20140084691 | POWERED DEVICE CONTROLLERS HAVING SHARED CONNECTION INTERFACES AND TWO-LEVEL INRUSH CURRENT LIMIT - A system for controlling the operation of isolation transistors in high power Power over Ethernet (PoE) networks to achieve greater power delivery to a load is disclosed. In one or more implementations, the system includes a first power over Ethernet (PoE) powered device controller configured to control power supply to a load, and a second PoE powered device controller coupled to the load and to the first PoE powered device controller. The second PoE powered device controller is connected to the first PoE powered device controller using a shared connection interface and is configured to control power supply to the load. The shared connection interface is configured to synchronize the first PoE powered device controller and the second PoE powered device controller to deliver power at least substantially contemporaneously to the load. | 03-27-2014 |
20140091627 | SYSTEMS, METHODS, AND APPARATUS FOR A GATE DRIVER CIRCUIT FOR AN ALTERNATIVE ENERGY POWER SUPPLY - Certain embodiments of the disclosure may include systems, methods and apparatus for providing a gate driver circuit for an alternative energy power supply. According to an example embodiment of the disclosure, a gate drive circuit for an alternative energy power supply may be provided. The gate drive circuit may include one or more switching device units operated in parallel. The gate driver circuit is configured to selectively control the multiple the switching devices in order to balance currents between each of the parallel-connected switching devices. | 04-03-2014 |
20160134108 | ACTIVE DROOP CURRENT SHARING AMONG POWER SUPPLY UNITS - Active droop current sharing among power supply units may regulate output currents of power supply units supplying shared current to a common load. The regulation may employ a combination of droop control and active current control. The shared current may be regulated such that each power supply unit provides a substantially equal share of the total current supplied. A current difference between two power supplies may be regulated to be within a desired maximum threshold for current difference. | 05-12-2016 |