34results about How to "Reduce voltage requirements" patented technology

A method and apparatus for separating a mixture of particles of various sizes in a capillary tube into groups by size using multiple forces of controlled amplitude. Ultrasonic radiation at a first selected frequency is applied to set up a standing pressure wave in the capillary tube, resulting in a first aggregating force which causes particles of all sizes to aggregate at positions within the capillary tube which correspond to nodes or anti-nodes of the standing wave. Transverse vibrations are also applied to the capillary tube. The frequency of the ultrasonic radiation is adjusted to reduce the magnitude of the first aggregating force. Inertial forces resulting from the transverse vibrations then cause the particles to separate by size. The apparatus and method allows a mixture of particles to be separated by size quickly, without requiring the use of high voltages.

The invention relates to the technical field of organic chemistry and discloses a boron-containing luminescent material and its preparation method and use. The boron-containing luminescent material solves the problem that the existing luminescent materials in a solid state do not emit fluorescent light. The boron-containing luminescent material has good optical properties and aggregation-induced emission effects and can emit fluorescent light in a solid state. The preparation method has simple processes, adopts easily available raw materials and has a high yield.

The invention uses a voltage clamping element to clamp the potential of the drain of the metal-oxide semiconductor transistor to reduce the voltage resistant demand of the metal-oxide semiconductor transistor, when the metal-oxide semiconductor transistor used for controlling the current of the light-emitting diode module is cut off. Therefore, the cost of the light-emitting diode drive device can be greatly reduced and the power consumption of the metal-oxide semiconductor transistor can also be reduced, thus increasing the efficiency of the entire circuit.

A direct current breaker topology with a bidirectional blocking function is disclosed. The direct current breaker topology comprises a main loop module (1), a fault current blocking module (2), a first diode group (3) and a second diode group (4); the first leading-out terminal of the main loop module (1) is connected with the positive electrode of the first diode group (3), and the connecting point between the first leading-out terminal of the main loop module and the positive electrode of the first diode group is used as the first leading-out terminal (5) of the direct current breaker topology; the second leading-out terminal of the main loop module (1) is connected with the positive electrode of the second diode group (4), and the connecting point between the second leading-out terminal of the main loop module and the positive electrode of the second diode group is used as the second leading-out terminal (6) of the direct current breaker topology; the negative electrode of the first diode group (3) is connected with the negative electrode of the second diode group (4); and the second leading-out terminal of the fault current blocking module (2) is used as the third leading-out terminal (8) of the direct current breaker topology.

The present invention relates to a novel organic electroluminescent compound and an organic electroluminescent device comprising the same. The organic electroluminescent compound according to the present invention has high electron transport efficiency, which can prevent crystallization during the formation of the device; is effective in forming a layer(s) to improve the current property of the device, and thus reduces the driving voltage of the device; and has the advantages of providing an OLED device having advanced power efficiency. While organic electroluminescent devices comprising conventional organic electroluminescent compounds need hole blocking layers, the organic electroluminescent device comprising the organic electroluminescent compound of the present invention does not have to comprise a hole blocking layer, and thus can decrease the voltage needs of the device.

The invention discloses a doubly-fed wind turbine generator set low-voltage rid through control method based on inductance simulation, and belongs to the technical field of wind power generation. When a fault occurs in a power grid, rotor side converter equivalent port impedance of the doubly-fed wind turbine generator set is simulated into a pure inductance form, an inductance value is dynamically adaptively adjusted in real time according to rotor voltage and current constraints, voltage and current margins of the rotor side converter can be made full use of, a rotor voltage requirement is lowered and rotor fault current are reduced, and a controllable low-voltage ride through capability of the doubly-fed wind turbine generator set is improved. The method provided by the invention can also effectively suppress electromagnetic torque pulsation, and has the advantages of being clear and definite in physical conception, and being simple in structure.

A guiding and pushing type honeysuckle picking machine solves the technical problems that an existing honeysuckle picking machine is heavy in load, high in cost, low in efficiency and lacking in practicality. The guiding and pushing type honeysuckle picking machine comprises a picking machine head, a delivery channel connected with the picking machine head, a honeysuckle collection device communicated with a discharge port of the delivery channel, a matched power source and a management circuit board. The picking machine head is a flexible guiding type picking assembly. The guiding and pushing type honeysuckle picking machine further comprises a pushing type delivery driving mechanism. The flexible guiding type picking assembly is arranged at the front end of the delivery channel. The pushing type delivery driving mechanism is arranged at the upper end of the front portion of the delivery channel. A hand-holding type rack of the machine is composed of a support plate of the delivery channel and a handle. Due to adoption of a guiding and pushing type novel structure, hands of workers are completely emancipated, easy and rapid picking is achieved, picking efficiency is improved and whole machine cost is reduced.

A drive arrangement for a roller curtain covering an opening defined by a frame includes a drum mounted horizontally across one side of the opening, a pair of hollow drive shafts fixed against rotation in opposite ends of the drum, and a pair of coaxial tension shaft portions fixed to the frame and received through respective hollow drive shafts. At least one coil spring is associated with each tension shaft portion, each spring having a first end fixed to a tension shaft portion and a second end fixed to the drum. A pair of drive motors are operatively connected to respective hollow drive shafts for synchronously rotating the drive shafts in order to coil a roller curtain on the drum.

A low-resistance silicon baseplate (11) has formed thereon a buffer layer 12 in the form of an alternating lamination of AlN sublayers (12a) and GaN sublayers (12b). On this buffer layer there are formed an n-type semiconductor region (13) of gallium nitride, an active layer (14) of gallium indium nitride, and a p-type semiconductor region (15) of galliumnitride, in that order. An anode (17) is formed on the p-type semiconductor region (15), and a cathode (18) on the baseplate (11).

The invention discloses a direct-current voltage conversion device which is used for generating a drive voltage to drive a load. The direct-current voltage conversion device comprises a voltage booster circuit and a modulation circuit, wherein the voltage booster circuit is used for receiving an input voltage and boosting the input voltage to generate an output voltage, and the voltage booster circuit further controls the output voltage according to a feedback voltage representing the state of the load so as to achieve the design of outputting rated current; the modulation circuit is coupled to the voltage booster circuit, is used for forming electric effect with the output voltage to generate the drive voltage, and leads the drive voltage to be higher than the output voltage. Therefore, the invention achieves the purpose of further boosting the boosted output voltage.

The invention relates to a modular satellite electric propulsion device with adjustable discharge pulses, and belongs to the field of electric propulsion of micro-nano satellites. By combination withrapid on-off of a controllable switch and on the basis of incapacity of abrupt changes of inductive current, inductive energy storage and voltage boosting are realized, discharge between an anode anda cathode of a thrustor is realized, plasma is ionized and ejected to produce thrust, and the duty ratio of output PWM (pulse width modulation) rectangular waves and the frequency adjustment thrust are adjusted by a pulse control circuit. The modular satellite electric propulsion device has a small size, and a feed mechanism is simple; on the basis of a mode of the inductive energy storage, 3-27 Vof low voltage can be boosted to plasma breakdown voltage of hundreds to thousands volts instantaneously, and the voltage demand of satellite power supply and distribution is reduced; the cost is effectively reduced; with the adoption of modular design, functions can be freely combined according to the demands, an interface is compatible, and different series of thrustors can be formed by combination with power supply units with different discharge powers and frequencies; and the digital adjustable pulse control circuit is easy to debug, and accurate control over the thrust can be realized.

The invention relates to a wind turbine generator set high voltage through auxiliary device adaptive to an island system and a method thereof. The auxiliary device is connected in parallel at the wind turbine generator set side of a wind power plant and comprises a controller, at least two switches and an electric reactor which is correspondingly connected in series with each switch. The controller is used for monitoring the grid-connected point voltage of the wind turbine generator set in real time. When the grid-connected point voltage rises to the voltage threshold, the switch is selected to perform electric reactor switching according to inductive reactive power required to be compensated for the grid-connected point, and the grid-connected point voltage is enabled to recover to the normal voltage range. The wind turbine generator is enabled to maintain grid-connected operation until recovery of the grid-connected point voltage when the grid-connected point voltage of the wind turbine generator rises to be over 1.1-1.3 times of rated voltage.

The invention discloses a switching power supply and floating rail LDO cascaded hybrid power supply and application thereof, and the hybrid power supply comprises a switching power supply, an LDO and a voltage stabilization module. The switching power supply is used for generating voltage VDDH and voltage VDDL so as to provide power supply voltage for the LDO; the voltage VDDH is greater than the voltage VDDL; the voltage VDDH is output from the first output end of the switching power supply to the VDD end of the LDO; the voltage VDDL is output from the second output end of the switching power supply to the VSS end of the LDO; the voltage stabilizing module is connected with the second output end of the switching power supply and is used for stabilizing the voltage VDDL and providing a discharge path for the hybrid power supply; and the LDO is used for reducing ripples in the voltage VDDH, providing voltage for the load and accelerating transient response of the load. The topological structure of the floating power rail power supply LDO cascade switching power supply is adopted, and meanwhile the purposes of reducing output ripples, accelerating transient response and achieving high-voltage output are achieved; in addition, the floating power rail power supply LDO obviously reduces the requirement for voltage resistance of a transistor in the LDO, and the design difficulty and the process preparation difficulty of the LDO are reduced.

The invention discloses an initiating explosive device ignition circuit and module. The initiating explosive device ignition circuit comprises an ignition control circuit and an initiating explosive device state detection circuit which are connected with each other, wherein the ignition control circuit adopts an ignition power supply and a control power supply and is used for controlling the ignition power supply applied to an initiating explosive device to be switched on or off according to a control instruction; the initiating explosive device state detection circuit adopts a detection power supply, two input ends of the initiating explosive device state detection circuit are connected to two ends of the initiating explosive device in parallel, and the initiating explosive device state detection circuit is used for detecting whether the ignition power supply applied to the initiating explosive device is switched on or not; and the voltage value of the ignition power supply is equal to that of the control power supply. According to the initiating explosive device ignition circuit and module, a time delay circuit is arranged in the ignition control circuit, so that electromagnetic interference is reduced, and meanwhile, the voltage of an ignition instruction is reduced, so that the voltage requirement of an electromagnetic isolation circuit is reduced, and the application range of an electromagnetic isolator is expanded.