214 results about "Power absorption" patented technology

A gas distribution ceiling electrode for use as a capacitive source power applicator and gas distribution showerhead in a plasma reactor includes a metal base and a process-compatible protective layer on the interior surface of he electrode having a dopant impurity concentration within a range corresponding to a minimal change in RF power absorption in the protective layer at an RF source power frequency with changes in coating temperature and or thickness. The metal base may have a set of first arcuately slotted gas passages and a set of pressure-dropping orifices coinciding axially with the top ends of the gas passages. The protective coating a set of arcuately slotted gas passages in registration gas passages of the metal base. The pressure drop in the orifices and the electric field drop in the slotted gas passages are both sufficient to maintain the pressure and electric field within the gas passages within a range that prevents arcing.

The invention discloses a grid-connected inverter capable of reducing electrolytic capacitance, belonging to the field of inverters in power electronic converters. The inverter comprises a direct current (DC) power source, a DC/DC converter, a DC/AC converter, a bidirectional DC/DC converter, a DC-link capacitor and an energy storage capacitor. The output end of the DC power source is connected with the DC/DC converter in series, then is connected with the DC-link capacitor in parallel and finally is connected with the bidirectional input end of the bidirectional DC/DC converter and the input end of the DC/AC converter respectively. The bidirectional output end of the bidirectional DC/DC converter is connected with the two ends of the energy storage capacitor and the output end of the DC/AC converter is connected into the grid. When the instantaneous output power of the DC/AC converter is greater than or smaller than that of the DC power source, the energy storage capacitor correspondingly outputs or absorbs power. The grid-connected inverter uses less electrolytic capacitance as far as possible or does not use electrolytic capacitance and the service life of the whole inverter is lengthened.

A plasma generating apparatus having superior plasma generation efficiency that uses a single reaction chamber. The plasma generating apparatus includes a RF generator for providing a RF power, an antenna for generating an electromagnetic field upon receiving the RF power, a reaction chamber for exciting/ionizing a reaction gas via the electromagnetic field, and generating a plasma, and a plasma channel for absorbing the RF power, and allowing a current signal to be induced to the plasma.

A new method and system are presented to drastically reduce the power absorbed by the body of the user's of mobile or wireless computing or communication devices, such as cell phones, so that the usage of those devices become safe for the users. In one case, multiple antennas are used, and the transmission is done in multiple steps or stages. The first antenna (the closest to the user) operates with extremely low power for short distances. In addition, the distance between the user and the last antenna is increased drastically. In another case, multiple frequencies are used, in combination with multiple antennas. The frequency chosen for the first antenna is selected from a range of frequencies corresponded to the low power absorption for a specific human tissue or for overall human body, as a weighted average. Other variations are also described in detail.

An absorption circuit for a voltage spike of a switching tube of a DC converter power includes: a transformer T1, a first commuting power tube Q1, a second commuting power tube Q2, a first clamp diode Ds1, a first clamp diode Ds2, an absorption capacitance Cs, an absorption switching tube Qs, a current reverse irrigation preventing diode Df, a fly-wheel diode D, a filter inductance L, a drive resistance R and a protection diode Dp. The invention is mainly characterized in that the absorption switching tube Qs is driven by a bridge arm square wave through driving the drive resistance R; the output of the absorption circuit is connected with the output of a power. The invention can effectively absorb the voltage spike of the power switching tube, reduce the voltage stress, improve the efficiency of the converter, and has characteristics of comparatively simple structure and reliable performance.

The invention discloses a control method of a modular multilevel converter based on a power frequency fixed switching frequency. The control method includes the steps that the modulation strategy that impulse waveforms are moved periodically is adopted, so that the characteristics of four impulse waveform parameters in one group are determined; specific values of the impulse waveform parameters are determined by referring to the latest level modulation strategy, fine adjustment is conducted on the impulse waveform parameters by the utilization of an impulse waveform parameter vector mode and according to an active energy equipartition principle, an impulse waveform parameter table is compiled, and under the condition that the total distortion rate of voltage harmonic is guaranteed, and automatic balancing of module absorbing power is achieved. A modulation ratio is determined by detecting the actual value of a power grid voltage and the actual value of a power grid current, the table is looked up according to the modulation ratio to obtain the impulse waveform parameters, then the impulse waveforms are moved periodically according to the corresponding principle and the number of sub-module cascades to obtain sub-module switching signals when capacitor voltage control does not exist, the control over the modular multilevel converter based on the power frequency fixed switching frequency is realized, and good reference value is provided for engineering application.

The first object is to provide a hydraulic drive device for a working machine, capable of optimally controlling pump absorption horsepower according to change in working condition, thereby reducing fuel consumption. The second object is to provide, on the basis of the first object, to provide a hydraulic drive device for a working machine, capable of suppressing variation in pump absorption horsepower. When working condition determined by a working condition determining section (41) is changed, for example, from working condition (a) to working condition (b), an engine output torque characteristics line (ELa) is switched to an engine output torque characteristics line (ELb) by an engine control device (40a), and a hydraulic pump absorption torque characteristics line (PLa) is switched to a hydraulic pump absorption torque characteristics line (PLb) by a hydraulic pump control device (40b). Further, output torque of an engine (17) and absorption torque of a hydraulic pump (18) are matched to each other at output torque points (Ma, Mb) at which the output of the engine (17) is maximum.

An apparatus for generating plasma includes a plasma discharge tube and a conductive coil helically wound around an outer surface of the plasma discharge tube. A waveguide is coupled to a microwave cavity surrounding the plasma discharge tube to guide the microwave energy into the plasma discharge tube such that the plasma is generated in the plasma discharge tube. The waveguide is positioned such that an electric field of the microwave energy is oriented at a predetermined angle with respect to the longitudinal axis of the plasma discharge tube. A resulting induced electric current in the conductive coil affects power absorption in the plasma discharge tube, the predetermined angle being selectable such that power absorption in the plasma discharge tube is according to a predetermined profile with respect to the longitudinal axis of the plasma discharge tube.

The invention relates to a wind generating set control method. The wind generating set control method comprises the following steps: step 1, acquiring an estimated wind regime characteristic value and a wind generator running state initial value via a local or remote communication system; step 2, according to the estimated wind regime characteristic value, the wind generator running state initial value and a wind generating set control parameter, calculating a running state value of a wind generating set at each time point; step 3, comparing the running state values, obtained in step 2, of the wind generating set with a designed safety threshold value of the wind generating set; step 4, adopting an absorption power coefficient reduction and power output improvement method to obtain a corrected wind generating set control parameter; and step 5, using the wind generating set control parameter meeting the designed safety threshold value as a final execution parameter of a wind generator control system. With the adoption of the wind generating set control method, the response speed of the wind generating set is increased, and energy loss and mechanical load brought by shutdown are avoided.

The invention is suitable for the technical field of design of photovoltaic inverters, and provides a device for avoiding frequent start stop of a photovoltaic inverter and the photovoltaic inverter. The device comprises a power absorption unit which is connected in parallel between a photovoltaic direct current (dc) positive busbar and a photovoltaic dc negative busbar and is connected with an auxiliary power supply of the photovoltaic inverter, and the power absorption unit is used for using a transistor to absorb power output by a solar cell panel through the photovoltaic dc busbar before the auxiliary power supply is started, and for stopping absorbing the power output by a solar cell panel through the photovoltaic dc busbar after the auxiliary power supply is started. Compared with the existing mode of power absorption by using power resistors, the invention has the advantages of reducing the occupied area of a printed circuit board, reducing the space occupied by the integral photovoltaic inverter, obviously improving the power density and reducing the cost of the photovoltaic inverter.

The invention discloses a terahertz converter capable of realizing power-absorbing mode and polarization conversion mode switching. The terahertz converter is composed of two graphene layers, one metal polarization conversion metasurface layer, one metal reflecting layer and three medium layers; each graphene layer is composed of an electrode layer and a graphene meta-surface layer adhered on an upper surface of the electrode layer; bias voltage V1 is applied between the graphene metasurface layer of one graphene layer and the electrode layer so as to adjust the Fermi energy EF1 of the graphene layer; and meanwhile, the bias voltage V1 is applied between the graphene metasurface layer of the other graphene layer and the electrode layer so as to adjust the Fermi energy EF2 of the graphene layer; when one of the Fermi energy EF1 and/or Fermi energy EF2 exceeds a switching threshold, the terahertz converter works at a power-absorbing mode; or the terahertz converter works at a polarization conversion mode. The terahertz converter provided by the invention can solve the problem that the single device cannot realize the polarization conversion and the power absorption at the same time.

The invention discloses an extended-range-electric-vehicle power system and a control method, and belongs to the technical field of new-energy-vehicle power. The extended-range-electric-vehicle powersystem and the control method are suitable for a pure electric vehicle with an extended-range device as a second power source. A power regulator formed by a super capacitor and a DC/DC convertor is additionally arranged on a traditional extended-range-device power system structure. The power regulator can provide and absorb transient power, and has the buffering protection effect on a power battery. A control system controls the power regulator according to the vehicle running state, wherein when a vehicle is accelerated, the power regulator can provide the high-order transient power componentto meet the power requirements of the whole vehicle; when the vehicle conducts braking deceleration, the power regulator can absorb the power impact component to prevent the battery from being impacted, the power battery works in the smooth and stable state all the time accordingly, frequent charging and discharging of the power battery are avoided, and the service life of the battery is prolonged.

The invention belongs to the technical field of aviation testing and particularly relates to a test system for airborne weather radar of an airplane. The test system comprises a power supply unit, a transceiver unit, a testing platform, a control unit, an antenna extension unit, a data acquisition unit, a signal processing unit, a display unit, a synthesis simulator and a power absorption unit, wherein the testing platform is taken as a center to implement connection of sub-units of a weather radar system. The connection between the units of the system is shown as the figure 1. According to the test system, the test work of all kinds of technical indexes of the novel weather radar is implemented.

An apparatus for generating plasma includes a plasma discharge tube and a conductive coil helically wound around an outer surface of the plasma discharge tube. A waveguide is coupled to a microwave cavity surrounding the plasma discharge tube to guide the microwave energy into the plasma discharge tube such that the plasma is generated in the plasma discharge tube. The waveguide is positioned such that an electric field of the microwave energy is oriented at a predetermined angle with respect to the longitudinal axis of the plasma discharge tube. A resulting induced electric current in the conductive coil affects power absorption in the plasma discharge tube, the predetermined angle being selectable such that power absorption in the plasma discharge tube is according to a predetermined profile with respect to the longitudinal axis of the plasma discharge tube.

The invention discloses a chassis dynamometer suitable for both a heavy-duty vehicle and a light-duty vehicle. In the invention, a power absorption device with larger loading power is adopted; a free roller is assembled so as to be suitable for heavy-duty vehicle dual drive axle detection; the diameters of twin rollers and a setting angle are appropriately enlarged, so that the shaft system resistance of the twin rollers and the frictional resistance of a light-duty vehicle wheel roller are approximate to the corresponding resistance of the chassis dynamometer, and the twin rollers are connected by mechanical drive at the ratio of 1:1 to carry out loss power ratio and loading control accuracy detection; after being disconnected, the two rollers detect various performances of a vehicle; a temperature sensor is assembled on an eddy current machine to accurately implement targeted transient variable speed to quantitatively control loading; the basic inertia of the two roller shaft systems is divided into two stages and is suitable for transient working condition detection of light-duty vehicles with different reference mass and stationary working condition detection of the lesser small rack inertia; and a fan is additionally arranged to carry out air cooling on the eddy current machine, thus detection on various performances of the heavy-duty vehicle and the light-duty vehicle can be carried out on the universal rack.

The present invention relates to a symmetric absorber-coupled far-infrared microwave kinetic inductance detector including: a membrane having an absorber disposed thereon in a symmetric cross bar pattern; and a microstrip including a plurality of conductor microstrip lines disposed along all edges of the membrane, and separated from a ground plane by the membrane. The conducting microstrip lines are made from niobium, and the pattern is made from a superconducting material with a transition temperature below niobium, including one of aluminum, titanium nitride, or molybdenum nitride. The pattern is disposed on both a top and a bottom of the membrane, and creates a parallel-plate coupled transmission line on the membrane that acts as a half-wavelength resonator at readout frequencies. The parallel-plate coupled transmission line and the conductor microstrip lines form a stepped impedance resonator. The pattern provides identical power absorption for both horizontal and vertical polarization signals.

The invention discloses a layered coordinated voltage control method suitable for a DC micro grid. The method comprises the following steps that when different layers of the DC micro grid generate a DC voltage deviation under sagging control, improved layered coordinated voltage control is started, the intercept of a DC voltage-active power sagging characteristic curve of the corresponding layer of each end transverter is changed, the converter charges and discharges a DC bus capacitor by increasing or absorbing power, and a DC voltage is recovered to and kept in the rated value. Via the method, the deviated voltage of sagging control of each layer is returned to the rated value, the DC voltage is adjusted without difference, and the multi-end DC micro grid runs more stably.

The invention provides a method for detecting dynamic performance of an automobile based on loading and inertia. An automobile is arranged on a chassis power measurement machine with quite big equivalent inertia; a power absorption device loads with constant current or constant force; the loading force is smaller than the driving force of a driving wheel; and the equivalent inertia M of the chassis power measurement machine, the equivalent inertia m of a rotation piece of an automobile neutral position power transmission system and the rotation inertia Ie of an engine are combined to server as loading load, so instantaneous power Pca of the driving wheel and the inertia power Pja of the engine at the rated torque rotation point na of the engine are detected. When the automobile is idling, the resistance power Pha of a vehicle wheel roller system during idling sliding at the same speed point is measured, loss power Pf of engine accessories at the rotation speed point na is estimated, and the power at the standard environment state of the corrected Pca+Pja+Pha+Pf is the engine rated torque power.

The invention relates to a road test-simulated standard-state fuel consumption detection method based on a bench test, which comprises the following steps: calculating or determining the system resistance F2 of an automobile at each specified point in a neutral-gear road test in case of zero load or full load, performing a zero-load bench test on the automobile to detect the resistance F1 of the entire transmission system of the neutral-gear automobile and a chassis dynamometer at each specified point, correcting F2 with a power correction factor into an engine driving force F2D under the current bench test environmental condition, calculating the loading force F3 of a power absorption device on the surface of a drum according to a formula F3=F2D-F1, loading the force constantly, and enabling a driver to adjust and stabilize the position of the accelerator pedal to detect the fuel consumption at a constant speed. When repeated tests are required for optimizing the fuel consumption design of the automobile, the bench test can be repeated as long as the road test is performed once. The invention has the advantages of apparent test comparison, high accuracy and simple, fast and convenient operation.