41results about How to "Change the voltage" patented technology

The invention discloses a separating type transformer capable of transforming three phases into single phase. The transformer comprises a primary assembly and a secondary assembly, wherein the primary assembly comprises a primary annular iron core and a primary three-phase symmetric winding; a groove is axially formed in the inner side of the primary annular iron core; the primary three-phase symmetric winding which is connected with a three-phase AC power supply is embedded into the groove; a primary cavity is formed in the primary assembly; the secondary assembly comprises a secondary iron core, and a secondary winding which coils the secondary iron core; the secondary assembly is positioned into the primary cavity; each phase of the three-phase AC power supply can be used for supplying power to the primary three-phase symmetric winding, and a rotating magnetic field can be formed in the primary cavity; the rotating magnetic fields are treated as mediums to uniformly absorb and collect the energy of the three phases of the power supply and then induce the energy of the three phases to the secondary winding; in addition, the primary assembly and the secondary assembly are electrically separated during the transforming process. The separating type transformer capable of transforming the three phases into the single phase has the phase transforming, voltage transforming and frequency varying functions, so that the transformer has a wide application prospect.

An anti-misstepping device for a pedal bar of a freight vehicle, relating to the technical field of freight transportation. An anti-misstepping device for a pedal bar of a freight vehicle includes a rotating rod. The inner wall is fixedly connected with a spring, the left side of the spring is fixedly connected with a slider, the inner wall of the slider is fixedly connected with a dielectric plate, the inner wall of the top of the rotating rod and close to the top of the movable groove is fixedly connected with a positive plate, and the inner wall of the top of the rotating rod is close to The bottom of the movable tank is fixedly connected with a negative plate. The anti-misstepping device for the pedal rod of the freight vehicle is used in conjunction with the electromagnet and the magneto-rheological fluid, and the electromagnet is in the energized state. It is difficult to move under the action of magnetorheological fluid. When the pedal is stepped on, the electromagnet will be powered off at this time, and the viscosity of the magnetorheological fluid will decrease. At this time, the connecting rod will shrink into the piston groove, and the throttle lever will automatically return to its original position. Effectively prevent the accelerator pedal from being stepped on by mistake, and improve the safety of the truck.

A stall protection device for concrete mixing equipment, relating to the technical field of concrete, a stall protection device for concrete mixing equipment, comprising a housing, the bottom of the housing is fixedly connected with a fixing seat, and a ring is provided in the middle of the fixing seat, The inner wall of the ring is movably connected with evenly distributed turning blocks, the inner wall of the turning block is fixedly connected with an electromagnet, the inner wall of the turning block is provided with a damping hole, the inner side of the turning block is fixedly connected with a stirring rod passing through the fixed seat, and the inner wall of the stirring rod There are two mutually symmetrical chutes. The stall protection device for concrete mixing equipment is used in conjunction with the electromagnet and the rotary block. When the stirring device rotates too fast, the electromagnet is in the energized state at this time, and the viscosity of the magnetorheological fluid in the ring increases. At this time, the magnetorheological fluid in the damping hole is difficult to flow, which effectively reduces the rotation speed of the rotary block, further reduces the rotation speed of the stirring rod, ensures the stable stirring of the stirring device, and improves the uniform mixing degree of the concrete.

The invention relates to a light emitting diode driving circuit with adjustable output current, which comprises a pulse-width modulation control chip, an input unit and an output unit, wherein a PWM-D (Pulse Width Modulation-Digital) pin of the pulse-width modulation control chip is electrically connected with a pulse-width modulation signal, a slide end of a slide theostat arranged in the input unit is electrically connected with an LIN-D (Linear-Digital) pin of the pulse-width modulation control chip, a source electrode of N groove reinforcing type MOSFETs (Metal-Oxide -Semiconductor Field Effect Transistors) arranged in the output unit is electrically connected with an ISEN pin of the pulse-width modulation control chip through a second resistor, a drain electrode is electrically connected with one end of an inductor and a positive electrode of a fast diode, a first capacitor is electrically connected between the other end of the inductor and the negative electrode of the fast diode, and both ends of the first capacitor are output ends of the light emitting diode driving circuit and are electrically connected with a light emitting diode module for driving the light emitting diode module.

A method for manufacturing a GaAs-based two-dimensional electron gas plasma oscillation terahertz detector includes: manufacturing four photoetching mask plates with bowtie antennas; making an epitaxial wafer on a GaAs substrate; coating a SiO2 film on the surface of the epitaxial wafer by means of evaporation; making patterns on the SiO2 film; making patterns on a second GaAs layer; etching; making patterns on the exposed second GaAs layer and the SiO2 film; evaporating Au / Ge / Ni metal, and stripping to form a source and a drain; annealing; transferring patterns of the fourth photoetching mask plate to a third AlGaAs layer with an epitaxial wafer exposed by means of photoetching; evaporating Ti / Au metal on the surface of the epitaxial wafer, and stripping to form a gate electrode on the third AlGaAs layer; leading a lead from the electrode to finish preparation. Frequency resonance range can be affected by bias voltage changes, and accordingly response gains of different frequencies can be regulated, and adjustability in response frequency is realized.