1347results about How to "Reduce output power" patented technology

A detection voltage, which is obtained by dividing the voltage of a fuel cell 1 by resistors, is compared with a first reference voltage Vref1 by a differential amplifier. The differential voltage is input to a control section. The control section performs PWM control for the circuit section according to the difference. The first reference voltage Vref1 is set according to the dividing ratio of the resistors, based on the output voltage when the fuel cell generates power at the maximum power point. To determine the output voltage for maximum power generation, a characteristic curve representing a current-voltage characteristic is approximated by an approximating line within a range excluding an area in which the output voltage changes abruptly when the output current is nearly zero, and an extrapolated voltage is obtained on the extension line of the approximating line at an output current of zero. Fifty percent of the extrapolated voltage is then determined as the output voltage when the fuel cell generates power at the maximum power point. Thus, a fuel cell control system that identifies a highly precise output voltage for power generation at a maximum power point and controls power so that the maximum power point is not exceeded could be provided.

In an automatic stop device that automatically stops the operation of an internal combustion engine after a predetermined automatic stop condition is satisfied, a load acting on the engine is removed when the automatic stop condition is satisfied. When the automatic stop condition is satisfied, the between the magnitude of the load on the internal combustion engine before and after of the automatic stop condition is satisfied is determined, and an ignition timing retard amount of an ignition plug is decided such that the retard amount is increased as the difference becomes greater. The ignition timing is retarded by the retard amount substantially at the same moment as the load removing operation before the automatic stop control is initiated.

The invention discloses a six-freedom-degree static-balance parallel motion simulation platform with a large bearing surface, comprising a movable platform, a pedestal, a static load balance device, and six same motion branches which are used for connecting the movable platform with the pedestal, wherein six guide rail pedestals are uniformly fixed on the pedestal; the lower ends of the outer sides of the guide rail pedestals are provided with servo motors, double guide rails are arranged at the upper sides of the motors, and screw shafts are arranged among the double guide rails; the one ends of the screw shafts are connected with the shafts of the motors, and the other ends of the screw shafts are connected with the bearing seats on the upper ends of the guide rails pedestals; sliding blocks are arranged on the double guide rails; the outer sides of the sliding blocks are connected with the one ends of support rods through rotary connection pieces, and the other ends of the support rods are connected with the movable platform through the rotary connection pieces; the upper ends of the sliding blocks are fixed with the one ends of steel wire ropes, and the other ends of the sliding blocks bypass through the fixed pulleys on the upper ends of the guide rail pedestals so as to be connected with the inner sides of the guide rail pedestals by a manner of weighting; and the upper ends of the weights are provided with two guide wheels, and the two sides are provided with double vertical columns which are fixed on the pedestal. The six-freedom-degree static-balance parallel motion simulation platform with the large bearing surface can bear heavy load and has the advantages of small volume and large work space.

A semiconductor optical amplifier (SOA) is placed in the optical path between the tunable laser and the external modulator on a DWDM optical transmitter. The modulator transfer function is measured using low-level amplified spontaneous emission light output from the SOA in order to find the modulator bias corresponding to minimum transmission. The external modulator is biased to the point of minimum transmission to reduce the transmitter output power during laser turn-on. The SOA bias is also turned off to provide further attenuation as the laser is turned on. Similarly, to avoid emitting off-wavelength light during wavelength changes, the transmitter output is attenuated with a combination of low SOA bias current and biasing the modulator to its minimum transmission point. In both cases, the laser wavelength is allowed to stabilize without interfering with adjacent DWDM channels.

A method and apparatus of interrogating an addressable array unit, which includes a substrate, a light reflecting layer on a front side of the substrate, and a plurality of features on a front side of the array. The method may include, for each of multiple features, illuminating the feature simultaneously with reflected and non-reflected interrogating light. A light emitted from respective features is detected. Either or both, constructive interference of interrogating light at the features, or constructive interference of light emitted from the features, can be obtained to allow lowering of light power from the source, enhanced signal, or reduced noise, or combinations of the foregoing. High depth discrimination may also be obtained without the need for a confocal detection system with conventional pinhole.

The invention relates to a data processor system for space-based measurement and control of a high-speed aircraft. The data processor system comprises a power supply module, an interface module, a control module, an encryption module, a forward processing module and a reverse processing module, wherein the power supply module is used for providing the secondary power source for the other modules; the control module is used for receiving control instructions, and sending the control instructions to the other modules; the encryption module is used for encrypting the reverse data stream and decrypting the forward data stream respectively; the forward processing module is used for receiving the mid-frequency signal, completing the receiving and processing link, recovering forward information, and outputting the forward information to an external device through the interface module; the reverse processing module is used for receiving image data, flight state information and remote measurement information, generating the mid-frequency signal after completing the launching and processing link to output the mid-frequency signal to an external radio frequency front end, and eventually sending the mid-frequency signal to a ground system. The data processor system supports the carrier high-dynamic measurement and control of the aircraft, is large in region coverage, supports multiple users, can realize real-time two-way communication with the aircraft, and has certain interference capability.

The present invention discloses a solid oxide fuel cell system and a control method thereof, and belongs to the field of fuel cells. According to the solid oxide fuel cell system structure, an output end of an air supply unit is connected with an input end of a stack unit through a valve, and is connected with an input end of a tail gas recovery unit through a valve, an output end of a fuel supply unit is connected with the input end of the stack unit through a mass flow meter, and is connected with the input end of the tail gas recovery unit through a mass flow meter, an output end of the stack unit is connected with the input end of the tail gas recovery unit, an output end of the tail gas recovery unit is connected with an input end of the fuel supply unit, and a control unit is respectively connected with various valves, various mass flow meters and various units. According to the present invention, work states of various valves and various flow meters are coordinatedly controlled according to load power requirements, and work temperatures of various units are regulated through adjusting gas flows so as to complete thermal-electric system control, improve system efficiency, and ensure a service life of the stack.

The invention discloses a dynamic positioning method and device based on UWB and laser ranging combination and belongs to dynamic positioning methods and devices. The dynamic positioning device comprises an ultra-wide band (UWB) wireless communication sensors, a UWB positioning label, laser ranging sensors, an upper computer and a POE interchanger. An ultra-wide band (UWB) wireless communication sensor station is arranged in an area to be detected, the laser ranging sensors are installed on and fixed to the ultra-wide band (UWB) wireless communication sensors, the UWB positioning label is fixed to a target to be detected, and the ultra-wide band (UWB) wireless communication sensors and the laser ranging sensors are connected with the upper computer through the POE interchanger. According to the dynamic positioning method and device based on the UWB and laser ranging combination, the laser ranging sensors are arranged on the ultra-wide band (UWB) wireless communication sensors respectively, so that the relative distance between every two adjacent ultra-wide band (UWB) wireless communication sensors is obtained, in this way, the coordinates of the ultra-wide band (UWB) wireless communication sensors can be re-determined or corrected after the ultra-wide band (UWB) wireless communication sensors are moved, and thus the requirement for dynamic positioning is met. The dynamic positioning method and device based on the UWB and laser ranging combination have the advantages that the dynamic positioning method based on the UWB and laser ranging combination is adopted, positioning is accurate, safety and reliability are guaranteed, installation is easy, and operation is convenient.

The invention discloses a high-frequency inverter power supply of a wireless power transmission device and a frequency doubling control method for the inverter power supply. An inverter frequency doubling circuit (2) consists of n sets of parallel inverter units (2'); a main controller (8) determines output power and output frequency according to the working conditions of a noncontact transformer (4) and a load (7), adjusts duty ratios of pulses and phases between the pulses and sends driving pulse signals; the n sets of inverter units (2') of the inverter frequency doubling circuit (2) are driven to act by a driving circuit (13) in a time division mode, so that the output voltage frequency or the current frequency of the inverter frequency doubling circuit (2) is n times those of the inverter units (2'), and adjustment of a 1 to n-times output frequency range is realized; and a primary resonant capacitor (5) and a secondary resonant capacitor (5') can be adjusted according to the output frequency of the inverter frequency doubling circuit (2) to keep efficient transmission, wherein n is an integer not less than 1.

An axial turbine has a turbine stage including stator blades fixedly provided on a stationary section and moving blades fixedly provided on a rotating section and has a structure in which a flow blowing out from a space formed between the stator blades and the moving blades exists. In order to prevent a decrease in stage output power due to such blowout flow thereby to improve the turbine stage efficiency, the axial turbine comprises a member coupling an inner circumferential side of the stator blades, and a structure provided on a surface of the member opposed to the moving blades for bending a flow blowing out from the side of the rotating section into a space between the stator blades and the moving blades in a rotational direction of the rotating section.

The invention discloses a method for matching a dynamic system of an engineering vehicle, which uses an electrically-controlled engine, wherein the engine demarcates engine power and engine torque under different working conditions. The method comprises the steps: obtaining current working condition of the engineering vehicle, including current load state; according to the current working condition, switching output torque of the engine to demarcated torque of the engine corresponding to the current working condition so that the engine operates on an external characteristic curve of the engine corresponding to the current working condition. The invention can provide corresponding power output under different load states so as to realize the effects of energy conservation and environmental protection. The invention also discloses a matching system for the dynamic system of the engineering vehicle.

The invention provides a control circuit achieving carrier aggregation and WIFI double-frequency MIMO and a terminal. The control circuit comprises a first antenna, a second antenna, a third antenna and a fourth antenna. The first antenna is connected to a receiving and sending device via a first switch and a first filter assembly. The second antenna is connected to the receiving and sending device via a second switch and a second filter assembly. A third antenna is connected to a third switch and a WIFI receiving and sending device via a first frequency divider. The fourth antenna is connected to a fourth switch and the WIFI receiving and sending device via a second frequency divider. In this way, in the case that the number of the whole antennas of the system is not increased, the carrier aggregation function and the WIFI double-frequency MIMO function can be achieved, and output power of a PA is not additionally increased, thereby reducing power consumption of the terminal.

The invention belongs to the technical field of optical storage combined power generation system virtual inertia compensation, and relates to a virtual inertia compensation method for an optical storage combined power generation system based on active support control. The method comprises: modeling a photovoltaic power generation system, analyzing the virtual inertia of the optical storage combined power generation system, and including inertia analysis of a photovoltaic-energy storage system. The active support control strategy based on the standard three-order model of the synchronous machine is adopted for the photovoltaic power generation unit, the port characteristics of the synchronous generator are better simulated, necessary inertia and damping are provided for the system, the voltage stability support capacity and the frequency stability support capacity of the system after photovoltaic grid connection are improved, and the robustness of the system is effectively improved. According to the invention, the low-frequency oscillation suppression capability of the photovoltaic-energy storage combined system can be enhanced, the system stability is improved, and the new energy photovoltaic absorption capability of the power grid is further promoted.

The embodiment of the invention discloses a multi-carrier peak clipping module which can carry out peak clipping processing to a multi-carrier non-main BCCH carrier according to the input power control information of each carrier of a next time slot so as to obtain the output power of the next time slot of each carrier after the peak clipping and further obtain the new power control information of each carrier of the next time slot. The embodiment of the invention also discloses a multi-carrier control method and a base station. By not carrying out the peak clipping to the main BCCH carrier in a GSM multi-carrier channel, the method for carrying out the peak clipping processing to the non-main BCCH carrier can reduce the total output power of a multi-carrier power amplifier under the condition that the power exceeds ration, thus forming stable GSM network coverage when protecting the reliable operation of a main device so as to guarantee the performance stability of the GSM network.