33results about How to "High power accuracy" patented technology

A power converter includes inverters, AC sides of the inverters being connected in parallel, a power command value determiner configured to determine a first power command value and a second power command value, the first power command value being lower than a proportional division power value obtained by proportionally dividing a required power value required as total output power of the inverters based on respective rated outputs of the inverters, the second power command value being higher than the proportional division power value, and a controller configured to control output powers of the inverters at the first power command value and the second power command value determined by the power command value determiner.

A power converter includes inverters, AC sides of the inverters being connected in parallel, and a controller configured to control total output power of the inverters by controlling output power of at least one of the inverters in a control cycle shorter than a shortest communication cycle which allows communication with each of the inverters.

The invention relates to UE (User Equipment) side uplink power control device and method in a TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system. The UE side uplink power control device comprises an interface module and an uplink power control processing module. The UE side uplink power control method comprises the following steps of: calculating open loop power PDPCH of each uplink time-slot code composite transmission channel CCTrCH of the current subframe when the uplink power control processing module controls the open loop power after receiving the power intensity of a received chip of a main public physical channel; regulating the transmitting power of a corresponding time slot in the next subframe according to the PDPCH; judging whether a downlink time-slot power control command is extracted or not; if so, entering closed-loop power control from the open-loop power control; calculating the closed-loop power of the uplink time slot CCTrCH; and regulating the transmitting power of the corresponding time slot in the next subframe according to the obtained closed-loop power. The invention not only reduces calculation amount, but also increases the power precision, thereby increasing the power control accuracy, improving the call quality and avoiding call drop.

The invention provides an SAR satellite radar echo simulation method and system and a medium. The method is characterized by, according to attitude information transmitted by a satellite in real time,determining current antenna pointing of the satellite; obtaining satellite position, speed and acceleration information by searching a PVT table, and carrying out interpolation calculation to obtainthe position of the satellite at the current time; calculating the distance between the satellite and a ground simulation target and due gain of a current target echo; establishing an echo signal mathematical model of a space-borne SAR point target; and through superposition of target echo models of a plurality of points, generating an echo signal of a space-borne SAR scene, and finally, obtainingSAR satellite echo signal data. The method improves truthfulness of SAR echo simulation; and through an SAR scene generation method based on multipoint target superposition, different types of scenescan be generated more quickly.

The invention relates to a linear dynamic calibration source system, in particular to a high-accuracy high-linearity high-temperature-stability dynamic calibration source system. According to the high-accuracy high-linearity high-temperature-stability dynamic calibration source system, automatic gain control of a power level is achieved by using of a negative feedback loop. Power output in a large dynamic range is achieved by using of an electronic stored program control attenuator. In an automatic gain control loop circuit, high accuracy degree of power is achieved by using of a synchronous real-time compensating radio frequency detector, linear compensation and temperature compensation. High-linearity output of the power is achieved in the whole dynamic range, and consistency of the power output in the whole working temperature range is ensured.

The invention relates to a transmission channel power control method of an RF transmission module. The method is used for controlling the power of a multi-band carrier signal. The method comprises the steps of detecting an IF digital power and an antenna port power in a transmission channel of each band of carrier; calculating a power difference of each band of carrier according to the IF digital power and the antenna port power; determining whether to adjust a gain according to the power difference of each band of carrier; if yes, determining a gain change trend of each band of carrier according to the power difference of each band of carrier; and performing corresponding gain adjustment on each band of carrier according to the gain change trend of each band of carrier. According to the transmission channel power control method of the RF transmission module, corresponding gain adjustment is performed on each band of carrier according to the gain change trend of each band of carrier, so that the power accuracy of each band of carrier can meet the requirement, and the transmission power accuracy of the RF transmission module is improved. The invention further relates to an RF transmission module.

The invention relates to a power supply circuit for automatically matching the load parallel set number and an operation method thereof. The power supply circuit comprises a current sampling circuit, a load feedback circuit and a power converter, wherein the power converter is provided with multiple load output ends, the current sampling circuit is used for acquiring a current signal outputted by the power converter, taking the signal as an input signal of the load feedback module and being separately connected with the power converter and the load feedback circuit, and the load feedback circuit is used for determining whether a corresponding load channel exists for the input signal, sending the determination result to the power converter and being connected with the power converter. According to the power source circuit, a channel output current value of the power converter is acquired, whether the load channel exists is determined by the load feedback circuit, and the acquired signal is transmitted to the power converter after determination is carried out by the load feedback circuit, adjustment on the output current of the power converter is realized, the output current and the output power are adjusted in a grade mode, high precision is realized, the power supply circuit is convenient for user to realize classification use, and the power supply circuit realizes relatively low cost.

The invention disclose an electrodynamic vibration table vibrating centre control device with air pressure compensate control, which includes a static controller and a dynamic controller, and the invention is characterized in that the control device also includes an air pressure compensate control circuit, the circuit detects moving coil gasbag gate or air pressure in air cell through the baroceptor and outputs voltage signal which reflects air pressure value, the voltage signal is divided into two signals after the AC signal is filtered by the filter circuit: one signal goes through the voltage latch circuit, the other signal goes through the inverting circuit, two signals are superposed by the supercircuit and inputted into the static controller by a compensate control. The invention has the advantages that: the air pressure compensate control circuit is setup, which solves the conflict between the dynamic controller and the static controller, and improves systemic safety and reliability; the invention has simple structure, works reliably and has high control precision; the voltage latch circuit of the invention has simple structure and high precision.

The invention discloses a dynamic design method for banknote turning channel structure, comprising the following steps: measuring and obtaining the transport resistance f of banknotes in the horizontal channel, and determining the minimum value of driving power required for transporting banknotes as the sum of transport resistance f and safety factor K ;Obtain the tension value F of the upper belt when it is working stably; select the width B of the upper belt and the lower belt according to the width of the transmission wheel; calculate the positive pressure value G applied by the upper belt on the supporting wheel and the lower driving wheel, where G is the product obtained by multiplying the tension value F and the width B; calculate the maximum static friction force between the upper belt and the upper surface of the banknote, and the maximum static friction force between the lower surface of the banknote and the lower belt, both of which are Fm, and here ignore the weight of the banknote on the lower surface of the banknote Influenced by the maximum static friction force of the lower belt, the maximum static friction force Fm is the product obtained by multiplying the positive pressure value and the friction coefficient, and the maximum driving power required to transport banknotes is determined to be the sum of the two maximum static friction forces 2Fm.

The invention discloses a method for equal power control of a photovoltaic power generation system based on an optimized Fibonacci sequence. The power is calculated by measuring the PV side voltage and current of the system, and then the Fibonacci sequence is used to realize equal power adjustment of the PV curve; after determining the limit command , to determine the position of the maximum power point of the system, and use the fill factor FF to estimate the voltage value V of the equal power curve k ’, when the actual detected (V k >V k ') and (P k >P 0 ), indicating that the equal power point has not been searched yet, and V k If the estimated value of the fill factor FF has been exceeded, the Fibonacci sequence will be initialized at the next moment, and the equal-power point will be searched for in a small step size. In some cases, the system needs to narrow down the search scope. The application of the present invention can effectively avoid the problem of large power offset in the system due to the use of large step size, improve the system accuracy, and solve the problem in the prior art that the Fibonacci causes a large power error rate of the system at the time of termination.

The invention is an electron mechanism microwave power sensor whose end can be heated directly and its manufacturing method. The method uses terminal load to realize the power absorption and converted into heat energy, measures the input power with temperature measurement, the structure uses thermocouple as terminal load, and converts the energy inputted from the coplanar waveguide, then measures the size of power by converting it into voltage mode. In the structure, the sensor includes substrate, coplanar waveguide grounding wire, coplanar waveguide signal wire, gold thermocouple arm, AlGaAs thermocouple arm, bonding pad, ohm contact, media; the manufacturing steps are: GaAs substrate preparation, AlGaAs depositing, ion injection and mixing, AlGaAs photoetching and etching out the thermocouple arm, depositing AUGE co-crystal, Ni and Au, photoetching, high temperature quenching, depositing SION media layer, depositing the metal and etching out the coplanar waveguide and part of thermocouple pipe, depositing media layer, producing the bonding pad.

The invention discloses a four-channel independent fixed amplitude type local oscillator power dividing device and a four-channel independent fixed amplitude type local oscillator power dividing method, which belong to the technical field of microwave testing. The four-channel independent fixed amplitude type local oscillator power dividing device comprises a local oscillator cascade extension unit, a first-stage power dividing amplification unit, a second-stage tail end fixed amplitude type power dividing / amplification unit A and a second-stage tail end fixed amplitude type power dividing / amplification unit B. Through adoption of the four-channel independent fixed amplitude type local oscillator power dividing method of the invention, power dividing / amplification / amplitude stabilization functions can be completed after an internal local oscillator source signal is generated, and four channels of local oscillator signals which are necessary can be finally provided for a receiver of a vector network analyzer, each output branch has an independent broadband amplitude stabilization function, thereby improving power stability of the local oscillator signal, an adjustable range of amplitude and power, and an isolating performance between local oscillator channels, as well as enabling the vector network analyzers to have a direct receiver cascade extension capability; in addition, the performance of a local oscillator circuit of the vector network analyzer is improved, technical innovation requirements of a high-stability and high-accuracy vector network analyzer can be furthestsatisfied in a universal way, thereby achieving universality.

The invention provides a power calibration method of transmitting / receiving equipment. The method comprises the first step that N frequency points are sampled on a frequency spectrum at even intervals, and a gain calibration value GSt corresponding to a single frequency signal fSt generated by power PIN is obtained; the second step that a gain calibration value GB11 corresponding to a wideband signal B11 generated by the power PIN is obtained, wherein the bandwidth of the wideband signal B11 is W1, the lower limiting frequency of the wideband signal B11 is f11L and the upper limiting frequency of the wideband signal B11 is f11H; the third step that a gain calibration value GB 12 corresponding to a wideband signal B12 generated by the power PIN is calculated as follows: if J-M<K<J, the following formula is satisfied (see instructions,) and if J<M<J+M, the following formula is satisfied (see instructions), wherein the bandwidth of the wideband signal B12 is W1, the lower limiting frequency of the wideband signal B12 is f12L and the upper limiting frequency of the bandwidth signal B12 is f12H.