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.

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 discloses a DC power supply power flow controller topology, which is composed of a first guide switch module (11), a second guide switch module (12) and a full-bridge sub module (13), wherein the first leading-out terminal of the first guide switch module (11) is connected with the first leading-out terminal of the second guide switch module (12) to serve as a first leading-out terminal (1) of the DC power supply power flow controller; the second leading-out terminal of the first guide switch module (11) is connected with the first leading-out terminal (4) of the full-bridge sub module (13), and the connection point serves as a second leading-out terminal (2) of the DC power supply power flow controller; and the second leading-out terminal of the second guide switch module (12) is connected with the second leading-out terminal (5) of the full-bridge sub module (13) to serve as a third leading-out terminal (3) of the DC power supply power flow controller.

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.

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.

The present disclosure mainly provides a clamping circuit, which is coupled to the first end and the second end of the switch tube through the first node and the second node, including: an RCD loop, including a parallel connection between the second node and the third node The first resistor and the first capacitor between them, and the diode whose cathode is coupled to the third node; the first Zener diode, whose cathode is coupled to the first node, and whose anode is coupled to the anode of the diode at the first Four nodes. The embodiments of the present disclosure can improve the clamping reliability and clamping effect, and can reduce the volume and cost of the clamping circuit.

This invention relates to a frequency-varying speed-regulating driver of three-phase asynchronous motor, which is characterized by the supply of power at each end of three-phase stator winding of the asynchronous motor with a group of frequency-varying drive main circuits and the use of digital circuit composed of micro-processor to form PWM control signals to unifiably control two groups of mutually independent main circuits. An inversion circuit is composed of high-performance field-control switch device and rectifier circuit is composed of noncontrolled rectifier bridge. The controller circuit generates pulse-width modulation signal frequency fixed at a value in the range of 1KHz-20KHz unchanged with the output frequency. This invented driver is used in speed modulation of high voltage large volume motor with no high voltage withstand requirement on needed elements.

The invention discloses a DC power supply power flow controller topology, which is composed of a first guide switch module (11), a second guide switch module (12) and a full-bridge sub module (13), wherein the first leading-out terminal of the first guide switch module (11) is connected with the first leading-out terminal of the second guide switch module (12) to serve as a first leading-out terminal (1) of the DC power supply power flow controller; the second leading-out terminal of the first guide switch module (11) is connected with the first leading-out terminal (4) of the full-bridge sub module (13), and the connection point serves as a second leading-out terminal (2) of the DC power supply power flow controller; and the second leading-out terminal of the second guide switch module (12) is connected with the second leading-out terminal (5) of the full-bridge sub module (13) to serve as a third leading-out terminal (3) of the DC power supply power flow controller.

The invention provides a control circuit, a control chip and a power supply system. The power supply system includes a control chip, the voltage at the output end of the power supply system is lower than the voltage at the input end, the control chip takes power from the output end of the power supply system, and the control circuit works according to preset logic to ensure that the control chip to work properly. Such configuration reduces the withstand voltage requirement of the control chip, lowers the manufacturing cost, and solves the problems of high withstand voltage requirement and high cost of the LED constant current drive chip in the prior art. At the same time, the power supply system also has the beneficial effects of simple structure and few peripheral components.

The invention discloses a shell and tube type heater. The heater comprises an upper head, a heating container, a tube plate which is horizontally mounted and an electric heating pipe vertically mounted, the tube plate is connected with the electric heating pipe through a screw sleeve and a clamping sleeve, the screw sleeve and the clamping sleeve are coaxially wound on the outer wall of the electric heating pipe, the clamping sleeve is mounted below the screw sleeve, the outer thread of the screw sleeve and the inner thread of the tube plate are engaged, a blade of the clamping sleeve is clamped to the wall of the electric heating tube, the upper head and the upper surface of the tube plate define a first space, the heating container is used for containing heated liquid, the liquid face ofthe heated liquid and the lower surface of the tube plate define a second space, the bottom end of the electric heating tube is located below the liquid level of the heated liquid, the shell and tubetype heater further comprises a ventilation pipe penetrating through the tube plate, being up to the first space, and being down to the second space, according to the shell and tube type heater, pressure-resisting needs of the tube plate, the upper head and a flange can be reduced, meanwhile, the material level of the tube plate, the upper head and the flange can be reduced, and the weight is reduced.

The invention relates to a modular satellite electric propulsion device with adjustable discharge pulse, which belongs to the field of micro-nano satellite electric propulsion. Combined with the rapid on-off of the controllable switch, the inductive energy storage and voltage boost are realized based on the fact that the inductive current cannot be mutated, so that the anode and cathode of the thruster are discharged, ionized plasma, ejected to generate thrust, and the output PWM is adjusted through the pulse control circuit The duty cycle and frequency of the rectangular wave adjust the thrust. The device is small in size and simple in supply mechanism; based on the way of inductive energy storage, it can instantly raise the low voltage of 3-27V to a plasma breakdown voltage of hundreds to more than a thousand volts, reducing the voltage demand for satellite power supply and distribution ;Effectively reduces the cost; adopts modular design, the functions can be freely combined according to the needs, the interface is compatible, combined with power supply devices of different discharge power and frequency, can form different series of thrusters; the digital adjustable pulse control circuit adopted is easy to debug , can realize the precise control of the thrust.

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 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 invention provides a control circuit, a control chip and a power supply system. The power supply system comprises a control chip, wherein the voltage of the output end of the power supply system is smaller than that of the input end of the power supply system, the control chip takes electricity from the output end of the power supply system, and the control circuit works according to preset logic to ensure that the control chip works normally. Through the configuration, the voltage withstanding requirement of the control chip is reduced, the manufacturing cost is reduced, and the problems that in the prior art, the voltage withstanding requirement of an LED constant-current driving chip is high, and the cost is high are solved. The power supply system has the advantages of being simple in structure and small in number of peripheral elements.

The invention discloses a power supply device having a power factor correction circuit, which is capable of receiving the voltage of three-phase voltage. The power supply device having the power factor correction circuit comprises three rectification modules which are respectively receiving first phase voltage, second phase voltage and third phase voltage of the three-phase voltage; each rectification module comprises a filter which is used for receiving one voltage of the three phase voltage and outputting filtering voltage, a single-phase power factor correction circuit which is coupled to the filter for receiving the filtering voltage and outputting correction voltage; and the each rectification module also comprises a main transistor, a converter, at least one power factor correction controller, and a simulation controller; the converter is coupled to the output terminal of the single-phase power factor correction circuit and is connected to the voltage output terminal; the power factor correction controller is connected to a main transistor; and the simulation controller is connected to the converter. The power supply device having a power factor correction circuit eliminates the mutual interference between the rectification modules, requires less quantity of members by comparing with the traditional three-phase parallel connection power factor correction circuit, saves the cost without influencing the result, and guarantees the quality.

The invention is suitable for the field of projection display and provides a light emergent pipe of a projection light source system. A plurality of transparent OLED (Organic Light Emitting Diode) luminous panels are laminated inside the light emergent pipe along the axial direction of the light emergent pipe. According to the invention, a plurality of transparent OLED luminous panels are laminated inside the light emergent pipe along the axial direction of the emergent pipe, so that light emitted by each OLED luminous panel can pass through the front luminous panels or pass through the front luminous panels after being reflected by the inner wall of the light emergent pipe and is finally projected onto a receiving surface. The OLED luminous panels have transparency and high brightness and visibility, and thus, when a plurality of OLED luminous panels are laminated, the light output can be increased and the transverse luminous surface also cannot be increased, so that not only the brightness of the projection light is improved, but also the lamination of the OLED luminous panels is beneficial for reducing the volume of a light source system. Moreover, OLEDs have low requirement on voltage and are easy to save electricity and the cost can be saved; and the light emergent pipe has the advantages of light weight, low thickness and simple structure and is also beneficial for reducing the weight and the volume of a projector.

A thyristor-based bidirectional DC circuit breaker topology with bidirectional blocking function, comprising a main branch module (1), a thyristor capacitor branch module (2), a first diode group (3) and a second diode Composed of tube groups (4); the first lead-out terminal of the main branch module (1) is connected to the anode of the first diode group (3), and its connection point is used as the first lead-out terminal of the DC circuit breaker topology ( 5); the second lead-out terminal of the main branch module (1) is connected to the anode of the second diode group (4), and its connection point is used as the second lead-out terminal (6) of the DC circuit breaker topology; the second The cathode of a diode group (3) is connected to the cathode of the second diode group (4), and is connected to the connection point (7) with the first lead-out terminal of the thyristor capacitor branch module (2); the thyristor capacitor The second lead-out terminal of the branch module (2) serves as the third lead-out terminal (8) of the DC circuit breaker topology.