164results about How to "Improve power stability" patented technology

A modular power transmitting system comprises multiple transmitter modules being connected together for transmitting power inductively to a receiver. The transmitter module is connected with other transmitter modules for transmitting power inductively to the receiver, wherein the transmitter module (40) comprises at least one transmitter cell (30), each transmitter cell having one transmitter coil (33) by which the transmitter cell transmitting power to the receiver, the transmitter module having an outer periphery (45) being shaped so as to fit to neighboring transmitter modules for forming an power transmitting surface, the at least one transmitter cell being arranged such that the power transmitting surface is constituted by an uninterrupted pattern of adjacent transmitter coils extending in said surface, and interconnection units (110,111) for connecting with neighboring transmitter modules for sharing a power supply.

An LED tube lamp having an LED unit is disclosed. The LED tube lamp includes a control circuit that selectively determines whether to perform a first mode or a second mode of lighting operation according to a state of a property of an external driving signal and a switching circuit coupled to the control circuit and the LED unit. When the control circuit determines to perform the first mode of lighting operation, the control circuit controls the second circuit in a manner such that the switching circuit maintains its on state to allow continual current to flow through the LED unit, until the external driving signal is disconnected from the LED tube lamp, and when the control circuit determines to perform the second mode of lighting operation, the control circuit controls the switching circuit in a manner to regulate the continuity of current to flow through the LED unit by alternately turning on and off the switching circuit.

A semiconductor assembly includes a semiconductor device, a through-via interposer, a coreless substrate and a stiffener. The semiconductor device is flip mounted on the interposer, and the interposer is affixed on the coreless substrate by adhesive and extends into an aperture of a stiffener which provides mechanical support for the coreless substrate. The electrically connection between the interposer and the coreless substrate includes bond wire and conductive micro-via. The coreless substrate can provide fan-out routing for the interposer.

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.

A power connector assembly with improved terminals includes a first electrical connector and a second electrical connector. The first electrical connector has a first insulated body and a plurality of first power-terminal sets received in the first insulated body. The second electrical connector has a second insulated body and a plurality of second power-terminal sets received in the second insulated body. Each of the first power-terminal sets is contacted with each of the second power-terminal sets correspondingly. Each second power-terminal set has a pair of separate second power terminals. Each second power terminal has a contacting portion for contacting with the first power-terminal set. Each contacting portion is protruded with at least one bulge portion toward the first power-terminal set from a side thereof.

The invention discloses an electric-heating anti-icing and de-icing system. The electric-heating anti-icing and de-icing system comprises an insulating heat-insulating layer, a heating coating layer and an insulating heat-conducting layer in sequence, wherein the heating coating layer comprises graphene and a high-molecular material, and the insulating heat-conducting layer comprises heat-conducting filler and a high-molecular material. The invention also discloses a method for preparing the electric-heating anti-icing and de-icing system, a wind turbine blade comprising the electric-heating anti-icing and de-icing system, and a graphene electrothermal-film wind turbine comprising the wind turbine blade.

An energy savings device, system and method are provided to improve electric utility grid stability by reducing power demand at a point of consumption. The method may include monitoring a power signal characteristic, obtaining a stability parameter for the utility grid, determining a stability condition based on the monitored power signal characteristic and the stability parameter; and regulating, at the point of consumption, an amount of energy received from the utility grid based on the determined stability condition. The system may include an energy savings system in communication with the electric utility grid and a processor and non-transitory computer-readable medium configured to perform the method.

The invention relates to a laser device and a laser power monitoring feedback method. The laser device comprises a laser emitter, an excitation source, a transmission and reflection mirror, a power sensor and a power feedback controller, wherein the excitation source is connected with the laser emitter, the transmission and reflection mirror is arranged on a light path of laser emitted from the laser emitter and is used for dividing the laser into reflection laser and transmission laser which are transmitted along different directions, the power sensor is arranged on a light path of the reflection laser and is used for acquiring reflection laser power of the reflection laser, and the power feedback controller is connected with the power sensor and the excitation source and is used for acquiring a difference value between the reflection laser power and a reflection laser power set value and adjusting an excitation voltage of the excitation source according to the difference value so that the difference value is within a difference value allowable range value. By monitoring the reflection laser power of the reflection laser, the difference value between the reflection laser power and the reflection laser power set value is acquired, the excitation voltage is adjusted in real time, and thus, the laser power emitted from the laser emitter is stable.

The invention discloses a power stable solid laser and a control method thereof. The power stable solid laser comprises a base inside which cooling water flows, a heat-conducting carrier for mountingand fixing an optical crystal of the solid laser, a temperature sensor disposed on the heat-conducting carrier, a semiconductor refrigeration unit disposed between the heat-conducting carrier and thebase and driven by a bipolar current driver, and a control unit. A temperature-current double closed-loop control system is realized on the basis of the conventional temperature control system; an inner loop is a closed current loop controlled by PI, and an outer loop is a closed temperature loop controlled by PID, so as to improve the control precision of the system, and finally achieve the purpose of improving the power stability of the solid laser.

An inverter and an over current protection method thereof are provided. The inverter includes an inverting circuit, a filtering capacitor and an over current protection circuit. The inverting circuit is configured to convert a DC input voltage into an AC output voltage and provide the AC output voltage to a load. The filtering capacitor is coupled to the inverting circuit and the load in parallel. The over current protection circuit is coupled to the inverting circuit and the filtering capacitor and configured to provide an over current protection mechanism. The over current protection circuit detects an AC current on the filtering capacitor and determines whether to enable the over current protection mechanism according to the AC current in order to restrain the power conversion operation of the inverting circuit.

The invention discloses a method for inhibiting a photo-darkening effect in an active optical fiber and provides an active optical fiber capable of inhibiting a photo-darkening effect in the active optical fiber and a manufacturing method thereof. Through doping alkaline metal ions which comprise one or more ions in the group consisting of Na ions, K ions, Mg ions, Ca ions, Ba ions and Sr ions into a fiber core in a rare earth doped active fiber manufacturing process, suitable dopant concentration and ratio are determined, the optical alkalinity of an environment where the rare earth ions are located, the photo-darkening additional loss is reduced, and the laser performance of a ytterbium doped fiber has no negative effect. The photo-darkening resistance performance of the active optical fiber prepared by the inhibiting method is greatly improved, compared with convention active optical fiber, the photo-darkening additional loss has an inhibiting effect of larger than 50%, the optical performance and laser efficiency of the optical fiber are not affected by the method, the stability is higher, and the service life is longer.

A gas turbine power generation system has a dual-shaft gas turbine, an electric generator mechanically connected to a low pressure turbine of the dual-shaft gas turbine and electrically connected to an electric power system, a rotary electric machine mechanically connected to a high pressure turbine through a compressor of the dual-shaft gas turbine and electrically connected to the electric power system, and an electric power output from the electric generator side to the electric power system is adjusted by operation of the rotary electric machine as a motor or as a generator.

The invention discloses a three-optical-path signal compensation system in an optical MEMS accelerometer and a method thereof. The three-optical-path signal compensation system comprises a three-optical-path compensation optical path and a signal processing system, wherein the three-optical-path compensation optical path comprises an optical isolator, a miniature beam splitter prism, a plane mirror, an adjustable attenuator and an photoelectric detector; and the compensation signal processing system comprises three analog-to-digital (AD) conversion modules, a subtracter, a divider, a data storage, summation and average module and multiplier, and the modules are realized through a programmable digital signal processor. The three-optical-path signal compensation system is relatively simple in structure, and can effectively reduce influences imposed on output signals by power fluctuation of a light source and ambient light. Compared with a scheme of adopting a laser with extremely high power stability, the cost of the optical MEMS accelerometer can be effectively reduced. In addition, the system and the method disclosed by the invention can be effectively applied to the optical MEMS accelerometer, disturbance of the output signals is reduced, and finally the zero-bias stability and the precision of accelerometer measurement are improved.

The invention discloses a radio-frequency power regulation method and a radio-frequency power amplifier. The method comprises the following steps: a power MOS tube of a power amplifier works under the on-off state; the output pulse of a quartz-crystal oscillator is transformed into a driving signal with adjustable pulse width, and the gate pole of the MOS tube is driven; and the stabilization regulation of the output power is realized by adjusting the pulse width of the driving signal of the gate pole of the power MOS tube and the primary access voltage value of an unbalanced transformer. In addition, the radio-frequency power amplifier comprises a controlling unit, a driving signal generation unit, a power amplifying unit and a voltage controllable direct-current power supply. The radio-frequency power amplifier controls the radio-frequency output power by adjusting the pulse width of the driving signal and the output voltage of the voltage controllable direct-current power supply. The invention realizes the control to the radio-frequency output power by the method of combining the pulse width adjustment of the driving signal and the power supply voltage adjustment of the direct-current main power supply and enhances the reliability and the stability of power control.

An LED tube lamp is disclosed. The LED tube lamp includes a lamp tube, a first external connection terminal and a second external connection terminal coupled to the lamp tube and for receiving an external driving signal, a rectifying circuit coupled to the first external connection terminal and the second external connection terminal and configured to rectify the external driving signal to produce a rectified signal, a filtering circuit coupled to the rectifying circuit and configured to filter the rectified signal to produce a filtered signal, an LED module coupled to the filtering circuit and configured to receive the filtered signal for emitting light; and a conduction-delaying circuit coupled to the rectifying circuit and comprising a conduction-delaying device, wherein the conduction-delaying circuit is configured such that when the external driving signal is initially input to the LED tube lamp, the conduction-delaying device is in an open-circuit state, and then the conduction-delaying device will enter a conducting state when voltage across the conduction-delaying device exceeds the conduction-delaying device's trigger voltage value, wherein the conducting state of the conduction-delaying device causes the LED module to conduct current for emitting light.

The invention realizes a measurement system for optical element transmittance and reflectance based on acousto-optic modulation, which is mainly used for solving the problem that the prior art is not high in measurement accuracy. The measurement system disclosed by the invention comprises a continuous laser, an optical path control chamber, an photoelectric amplification module, a feedback control module, a measurement rotary table and a parameter measurement module; the laser outputs laser with power to be stabilized; the laser outputted by the laser is radiated to a detector in a perpendicular manner after passing through the optical path control chamber to generate a current signal which is amplified by the photoelectric amplification module into a voltage signal; the feedback control module processes the voltage signal to obtain an feedback signal in order to control an acousto-optic demodulation driving device to adjust an acousto-optic demodulator to stabilize the laser power; the highly stable laser enters the optical member to be detected; and the laser power is obtained through measuring transmittance and reflectance of the optical member to be measured to calculate the reflectance and transmittance of the optical member to be measured. The invention is high in measurement accuracy and easy in operation.

The invention discloses power stabilizing device and method for a laser device. The power stabilizing device comprises the laser device, a focusing lens, nonlinear crystal, a spectroscope, a landfill pond, a lambda/2 wave plate, a polarization beam splitter, a photoelectric detector and a controller, wherein an output light beam of the laser device is focused in the nonlinear crystal through the focusing lens; a small part of laser is converted into frequency-doubled light; a transmitted beam of the nonlinear crystal passes through the spectroscope; fundamental light is separated from the frequency-doubled light; the frequency-doubled light is introduced into the landfall pond; the fundamental light sequentially passes through the lambda/2 wave plate and the polarization beam splitter and is divided into two beams of light; transmitted light is output as main laser; reflected light enters the photoelectric detector; an output signal of the photoelectric detector enters a controller; and the controller generates a control signal to control the temperature of the nonlinear crystal, so as to stabilize the laser power. According to the power stabilizing method disclosed by the invention, the frequency-doubling conversion efficiency is changed by controlling the temperature of the nonlinear crystal; the frequency-doubling loss of the laser beams is changed; and fluctuation of the laser power is compensated, so as to reach the target of stabilizing the laser power.

The invention relates to the field of mica material processing, in particular to mica electro-thermal film. The mica electro-thermal film is in a composite multilayer structure, the middle layer is a heating element, and two sides attached to the heating element are mica substrates. The heating element is an alloy foil sheet with a heating circuit etched, the mica substrates are mica laminated paper, and the electro-thermal film is formed by pressing the alloy foil sheet and the mica substrates through high-temperature adhesives and a high temperature pressing process. The mica electro-thermal film is simple in structure and high in thermal conversion efficiency; and heating equipment produced through the mica electro-thermal film meets utilization requirements of being safe and comfortable and environment friendly and energy saving.