619results 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 server uninterruptible power supply is housed inside the server case 91, and is connected to the 12V DC power supply line 43 of the server 90. The uninterruptible power supply is provided with a DC / DC boost converter 3 that steps-up the power supply line 43 voltage to the rechargeable battery 1 charging voltage, rechargeable batteries 1 having a specified voltage of 13V to 60V, a DC / DC step-down converter 2 that steps-down the rechargeable battery 1 voltage to the voltage of the power supply line 43, and a charging and discharging control circuit 4 that controls the DC / DC boost converter 3 and the DC / DC step-down converter 2. In the event of commercial power source 95 outage, the uninterruptible power supply steps-down the rechargeable battery 1 output voltage to the voltage of the power supply line 43 and outputs that voltage to maintain operation of the server 90.

A wind power generation system temporarily stops a power converter when a system disturbance occurs, and reactivates the power converter after detecting a solution of the problem of an influence (overcurrent of a stator, direct current component of a stator, overcurrent of a rotor, etc.) of a fault occurring in a doubly-fed generator during a system fault. During a system fault, a reactive current can be safely output from a doubly-fed generator to an electric power system without destroying equipment of the wind power generation system.

The invention relates to an optical path structure of a time-division-multiplexing optical fiber hydrophone array and a modulation and demodulation method thereof. The time-division-multiplexing optical fiber hydrophone array comprises a laser and an acousto-optical modulator at the input end thereof, wherein the acousto-optical modulator is used for modulating a light wave, sent out by the laserthrough an optical fiber, into a light interrogation pulse and then inputting the light interrogation pulse to the time-division-multiplexing optical fiber hydrophone array for interrogation; the optical path difference between two arms of an optical fiber hydrophone unit is larger than the persistence length of the light interrogation pulse, and when the light pulse is reflected by Faraday rotary mirrors at two arm ends and then returns to a coupler, the reflected pulses at two arms are free from interference, but respectively reach a dry end through water in order; the time-division-multiplexing optical fiber hydrophone array comprises an interferometer and a phase modulator at the output end thereof; and the light interrogation pulse is reflected by the Faraday rotary mirrors at two arm ends and then returns to the coupler, then enters the interferometer for interference, is subjected to PGC (Phase Generation Carrier) external modulation, and is finally photoelectrically converted to an electric signal.

The invention relates to an energy storage system control strategy oriented to power grid AGC frequency modulation, characterized by comprising the following steps of battery energy storage involving in AGC frequency modulation structure design and of SOC layered control strategy. According to the invention, starting from the perspective of power grid AGC frequency modulation control, safety factors are designed for the battery energy storage operation cycle; the energy storage system's capacity and power restriction are fully considered; through the energy management to the energy storage system and based on the SOC layered control strategy, the power charging and discharging frequency modulation power for the energy storage system is determined, which means that while the power grid frequency becomes more stable, the energy storage system is steered clear of excessively charging and discharging. The method of the invention is scientific and reasonable. With strong practicability, the method can also achieve good performances.

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 discloses a method for preparing nano-rod cellulose, which comprises the following steps: dispersing fiber raw material into sulphuric acid water solution of which mass concentration is 50 to 65 percent, hydrolyzing the fiber raw material by single-mode microwave radiation for 5 to 60 minutes at a temperature of between 20 and 50 DEG C and at the microwave radiation power of 10 to 100 watts, then adding distilled water into hydrolysis solution and diluting the hydrolysis solution to have 10 times of volume, and obtaining stable nano-rod cellulose suspension through post treatment processes such as centrifugal separation, dialysis, filter, ultrasonic dispersion and the like of the diluent, so as to obtain the nano-rod cellulose of which width is about 10 nanometers and length is about 200 to 300 nanometers.

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 discloses an electric heating film which comprises an adhesive agent and mixed powder mixed together as well as glass fiber cloth for bearing the adhesive agent and the mixed powder. The electric heating film is characterized by comprising the following components in parts by weight: 100 parts of polyimide resin as the adhesive agent, 4-30 parts of the mixed powder and 0-2 parts of stabilizer, wherein the mixed powder comprises conductive carbon black and graphite powder, and the weight ratio of the graphite powder to the conductive carbon black is 1: (0.8-1.25). A preparation method of the electric heating film comprises the following steps of: firstly, mixing the conductive carbon black with the graphite powder according to the weight ratio of 1: (0.8-1.25) to obtain the mixed powder, mixing the polyimide resin with the mixed powder according to the weight ratio of 1: (0.04-0.30), and adding a thinning agent for diluting; secondly, grinding for 10-60 minutes by using a grinding machine to obtain a colloidal mixture; and thirdly, coating the colloidal mixture on the glass fiber cloth by using a coating machine, roasting the colloidal mixture so that the colloidal mixture is immersed in and cured on the glass fiber cloth to form the electric heating film. The invention is mainly used for manufacturing the electric heating film.

A method and apparatus is provided for use in power amplifiers for reducing the peak voltage that transistors are subjected to. A power amplifier is provided with first and second switching devices and an inductor connected between the switching devices. The switching devices are driven such that the switching devices are turned on and off during the same time intervals. Differential RF power amplifiers are also provided with inductive networks coupled at various nodes of the power amplifiers. In some examples, techniques are used to stabilize differential power amplifiers by stabilizing common-mode feedback loops.

The cooling structure for a secondary battery has a first center exhaust duct and a second center exhaust duct arranged on a floor between the driver seat and the front passenger seat. Each exhaust duct is located between the bottommost face of the first battery pack and the vehicle floor to constitute a heat insulation layer. By employing this configuration, there can be provided a cooling structure for a secondary battery that is not affected by heat from an exhaust pipe located under the floor, even in the case where a battery pack is arranged between the driver seat and the front passenger seat.

An image forming apparatus to achieve stable attachment / detachment of a developing device and stable power transmission while preventing contamination of the surroundings due to leakage of developer. The image forming apparatus includes a cover to be opened away from or closed to an upper surface of a body, and a drive device provided at a side of the developing device so as to be coupled with or released from the developing device and be moved in linkage with opening / closing of the cover. The developing device includes driven coupling members to be rotated upon receiving drive power from the drive device. The drive device includes driving coupling members engaged with the driven coupling members, and a moving member to horizontally move the driving coupling members according to the opening / closing of the cover and to control the engagement / disengagement of the driving coupling members and the driven coupling members.

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.

The embodiment of the invention provides a wireless charging system and a method for controlling power transmission of the wireless charging system. The wireless charging system comprises a wireless charging emission end and a wireless charging receiving end. The method comprises the steps of detecting a coupling coefficient between the wireless charging emission end and the wireless charging receiving end; calculating a wireless charging power of the wireless charging system according to the coupling coefficient between the wireless charging emission end and the wireless charging receiving end; and adjusting a compensation parameter of a compensation network of the wireless charging emission end and / or the wireless charging receiving end on the condition that the wireless charging power is lower than a preset power, so that the wireless charging power is larger or equal to the preset power. According to the wireless charging system and the method, stable power transmission can be achieved by adjusting the parameter of the compensation network.

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.

Infrared laser light generated by a solid state diode pumped transform-limited Ti:Sapphire laser is converted to UV wavelengths using third and fourth harmonic generation systems. The resulting output is tunable between approximately 187 and 333 nm. The combined solid state Ti:Sapphire laser and harmonic generation system includes feedback mechanisms for improved power and wavelength stability. The system can operate at pulse repetition rates of several thousand Hertz.

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.

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.

Provided is a multifunctional power-conversion system which controls active power and reactive power by employing distributed power. With respect to the multifunctional power-conversion system according to the present invention, an auxiliary power device, using wind power and / or solar power, is connected to a power system; and a distributed power device, such as a battery, for temporarily storing power is connected thereto while being connected to the auxiliary power device. A power converter connects a high-capacity power supply source, such as a periodic power source or a main power supply source, to the system. Therefore, the electricity consumption status is checked such that the control of active power and reactive power is enabled.