618results about How to "Stable power" patented technology

A system and method are disclosed for implementing a power source including a power amplifier that generates a radio-frequency power signal with an adjustable operating frequency. The power amplifier also generates a reference phase signal that is derived from the radio-frequency power signal. An impedance match provides the radio-frequency power signal to a plasma coil that has a variable resonance condition. A phase probe is positioned adjacent to the plasma coil to generate a coil phase signal corresponding to the adjustable operating frequency. A phase-locked loop then generates an RF drive signal that is based upon a phase relationship between the reference phase signal and the coil phase signal. The phase-locked loop provides the RF drive signal to the power amplifier to control the adjustable operating frequency, so that the adjustable operating frequency then tracks the variable resonance condition.

In a base station which has a plurality of antennas, each of a plurality of comparison circuits operates to compare correlation levels, which are obtained by despreading received signals for a plurality of channels, with each other with respect to the antennas. Each of a plurality of transmission antenna selecting circuits operates to determine from which antenna a transmission signal is to be transmitted for every channel. Each of a plurality of multiplexing circuits operates to multiplex the transmission signals of the individual channels, which are spread, for every antenna. As a result, on the basis of the result of the comparison of the correlation levels with respect to the antennas, a transmission antenna is selected for every channel, and the signals of the channels that are to be transmitted by a given antenna are multiplexed, whereby the base station achieves transmission diversity.

A semiconductor device includes a plurality of core chips and an interface chip that controls the core chips. Each of the core chips and the interface chip includes plural through silicon vias that penetrate a semiconductor substrate and plural pads respectively connected to the through silicon vias. The through silicon vias include a through silicon via of a power source system to which a power source potential or a ground potential is supplied, and a through silicon via of a signal system to which various signals are supplied. Among the pads, at least an size of a pad connected to the through silicon via of the power source system is larger than a size of a pad connected to the through silicon via of the signal system. Therefore, a larger parasitic capacitance can be secured.

The present invention provides a solar cell that can be utilized as a stable electric power source for cloudy weather. An output voltage V1 of the solar cell 1 is lowered by a DC-DC converter 5. When a battery V2 is charged with an output of the converter 5, the converter 5 is stopped and the power of only the battery V2 is supplied to a low-voltage inverter circuit 6. The electric power supplied from the converter 5 is increased by boosting the output voltage of the converter 5 as well as starting to supply electric power from the battery V2. While the electric power of the converter 5 is increased, the performance of the solar cell 1 is judged. When the performance is decreased, the output voltage from the converter 5 is lowered and the amount of electric power supplied from the battery 2 is increased relatively.

The invention provides a composite energy storage system, which consists of a supercapacitor and a storage battery, wherein the composite energy storage formed by the supercapacitor and the storage battery has both power type and energy type characteristics; through the combined use, the charging and discharging times of the storage battery can be effectively reduced; in addition, the utilization rate of the energy storage system can be improved. According to an energy management and control optimization method matched with the composite energy storage, the total power of the composite energy storage is distributed through a low-pass filter, so that the supercapacitor and the storage battery respectively share a high-frequency component and a low-frequency component in the fluctuating power; through the two-way DC/DC1 converter constant-power control on the storage battery, the two-way DC/DC2 converter constant bus voltage control on the supercapacitor, and control strategies of the two-way DC/AC converter, the network loss of a power distribution network is reduced; the utilization efficiency of new energy sources is improved; the power fluctuation during micro power grid interconnection is effectively inhibited; the electric energy quality of a region electric network is improved; in an offline state, the stability of the voltage and the frequency of a micro power grid system can be ensured; the power balance generated during grid connection/off-grid switching is fast compensated.

A solar power generation system comprising: plural customers each having a solar panel, a power convertor for converting DC output from the solar panel into AC output, an output controller for suppressing the power convertor output which becomes higher than a predetermined value, a measuring unit for measuring the amount of sold power, the amount of purchased power and the amount of generation-suppressed power; and an watt-hour meter measurement data adjusting unit linked with the plural customers via communication lines. The watt-hour meter measurement data adjusting unit calculates provisional generation-suppressed power amounts that make the burdens of the customers even, and calculates the power amounts to be sold by the customers on the basis of the provisional generation-suppressed power amounts. Thus, the generation-suppressed power of the solar power generation system can stabilize the power system and the chances for selling power can be fairly allocated to customers having solar panels.

A source signal is provided. The source signal is XORed with a scrambling random signal to generate a scrambled signal. The scrambled signal is transmitted through the digital logic circuit. The scrambled signal is XORed with the descrambling random signal logically identical to the scrambling random signal to produce a descrambled signal identical to the source signal. In one embodiment, the scrambling random signal is transmitted through the digital logic circuit and used as the descrambling random signal. In another embodiment, the scrambling random signal and descrambling random signal are generated independently using pseudo-random number generators. In yet another embodiment, the scrambling random signal is self-synchronizing and is contained within the pattern of the scrambled signal.

The invention relates to a distributed energy management method and device. The distributed energy management device is composed of a ground layer, an intermediate layer and an energy management layer. The ground layer comprises a distributed power controller, an energy storage controller, a load controller, an invertor, a converter and a breaker. The intermediate layer comprises a data communication module, an operation control module, an energy storage management module and a load management module. The energy management layer comprises a data communication and monitoring module, an economic dispatch and optimal operation module, a load prediction module and a power generation prediction module. The ground layer and the intermediate layer coordinate and control short-term power in a local micro-grid system to be stable; the energy management layer coordinates and controls long-term power in the micro-grid system where the energy management layer belongs to be stable, and economization of micro-grid operation is achieved; meanwhile, the distributed energy management device is clear in structure, functions are specific, and system upgrade and function extension are facilitated.

The invention discloses a uniform and independent variable pitch hybrid control method for a megawatt horizontal axis wind turbine based on master control, namely, when the rotation speed deviation of a power generator is larger, a uniform variable pitch control manner is adopted; and when the rotation speed deviation is smaller, an independent variable pitch control manner is adopted to drive anelectrical servo variable pitch mechanism to drive a blade to finish a variable pitch action. During the uniform variable pitch control, a variable pitch command sent by a wind turbine master controlis a variable pitch preset command for each blade; and during the independent variable pitch control, model transformation is performed on the variable pitch command sent by the wind turbine master control to obtain a corresponding average wind speed, calculation and control are performed through a shimmy load and waving load model in combination with respective space position of each blade to obtain the respective variable pitch command for each blade. Both a uniform variable pitch controller and an independent variable pitch controller take the variable pitch command sent by the wind turbine master control as an input value of the controller, so that good compatibility and generality of the overall wind turbine are guaranteed, the advantages of quick response of the uniform variable pitch control and high precision of the independent variable pitch control are integrated, and the purposes of stabilizing output, optimizing power, reducing and balancing blade load, reducing spindle vibration, improving the dynamic stability of the wind turbine and prolonging the service life of the wind turbine are achieved.

The invention relates to an MEMS wideband piezoelectricity energy collector based on a bistable state frequency raising structure in the technical field of electric appliances, which comprises a frame, a bistable state beam arranged in the frame, a piezoelectric over hanging beam, a permanent magnet and a soft magnet. The MEMS wideband piezoelectricity energy collector is characterized in that twoends of the bistable state beam are both fixed on the frame, the permanent magnet is attached to the bistable state beam, on end of the piezoelectric over hanging beam is fixed on the frame, and thesoft magnet is arranged on the piezoelectric over hanging beam. The invention adopts a bistable state frequency raising structure to enable a piezoelectric transduction component to obtain greater output power in a low-frequency vibration environment. Compared with the prior MEMS piezoelectric energy collector, the invention has simple structure, easy manufacture and volume reduction, can be operated in a low-frequency environment, and can output stable frequency within wider environment vibration frequency range.

The invention discloses a method and a device for stabilizing laser frequency and power. The method comprises the following steps of: obtaining primary diffracted light, and radiating the primary diffracted light into a photoelectric detector; detecting the intensity of the primary diffracted light; processing a detected signal; sending the processed signal to a driving source; and enabling an output signal of the driving source to act on an acoustic optical modulator. The device comprises a laser, the acoustic optical modulator, an electrooptical modulator, a polarization splitting prism, a quarter-wave plate and a Fabry-Perot interferometer. The method and the device have the advantages that reference precision and stability are greatly improved, better power stabilizing effect is realized, and frequency stabilizing effect is improved.

The invention discloses a renewable energy source cooling, heating and power microgrid system and a control method. The renewable energy source cooling, heating and power microgrid system comprises a power module and a cooling/heating module. According to the power module, a solar power generation system is sequentially connected with a DC/DC converter and a DC/AC converter in series and then connected with an AC bus, a wind power generation system is sequentially connected with an AC/DC converter and a DC/AC converter and then connected with the AC bus, a gas internal combustion generation system is directly connected with the AC bus, a storage battery pack is connected with the AC bus through a bi-directional DC/AC converter, variable power electricity storage hot water tanks are connected with the AC bus, and the AC bus is connected with a power distribution network through a PCC. The renewable energy source cooling, heating and power microgrid system and the control method have the advantages that clean renewable energy sources such as methane, wind energy and solar energy are adopted as energy sources of a cooling, heating and power microgrid, no pollution is caused to the environment, operation cost is very low, and the application range is wide; by the adoption of a multi-microsource energy supply mode, the problem of capacity allocation redundancy of a single energy supply system can be solved.

A method for enhancing a sensitivity of an optical sensor having an optical cavity counter-propagates beams of pump light within the optical cavity to produce scattered light based on Stimulated Brullion Scattering (SBS). The properties of the pump light are selected to generate fast-light conditions for the scattered light, such that the scattered light includes counter-propagating beams of fast light. The method prevents the pump light from resonating within the optical cavity, while allowing the scattered light to resonate within the optical cavity. At least portions of the scattered light are interfered outside of the optical cavity to produce a beat note for a measurement of the optical sensor. The disclosed method is particularly applicable to optical gyroscopes.

A solar tracking system, including: a horizontal support; a panel frame connected to the horizontal support such that the panel frame can be tilted forwards and backwards, with a solar battery installed on the panel frame; a support unit connected both to the horizontal support and to the panel frame such that the support unit in cooperation with the horizontal support and the panel frame forms a triangular arrangement, wherein the support unit is slidably connected to either the horizontal support or the panel frame such that the support unit can slide relative to either the horizontal support or to the panel frame, thus tilting the panel frame forwards and backwards according to variations in a slidable position thereof; and a drive unit for sliding the support unit relative to the horizontal support or the panel frame. The solar tracking system realizes a simple, stable support structure and allows the solar battery panel to track the position of the sun with a low amount of power.

Methods and devices for generating stable, tunable and intense output light pulses are provided. A primary beam of light pulses is used to form a filament in an interaction zone. A secondary bean of light pulses is superposed with the filament and interacts therewith to generate the output light pulses. The parameters of the primary and secondary beams in the interaction zone can be controlled to obtain targeted optical characteristics of the output pulses. Multiple secondary beaus may also be used.