38results about How to "Change current" patented technology

The invention discloses a narrow-spacing low-SAR high-isolation MIMO antenna. The narrow-spacing low-SAR high-isolation MIMO antenna comprises a PCB and two antenna bodies used for supporting different service signals, wherein the two antenna bodies are distributed on the two sides of the top end of the PCB and respectively provided with feeding points, the antenna bodies are connected to the PCB through the feeding points respectively, and the feeding points of the two antenna bodies are asymmetrically distributed. According to the antenna, the feeding positions are arranged in the asymmetrical positions on the same side of the PCB, it is avoided that the feeding positions of the antenna are located in the symmetrical current resonance positions, and the isolation degree between the antennas is improved.

Disclosed is an elongating arc plasma jet ignition device. A swirler is fixed to the bottom of an inner cavity of a shell; a positive pole is located in the shell and fixedly connected with the swirler; the lower end of an insulation sleeve is installed in a central hole of the swirler, and an air chamber is formed in the gap between the outer peripheral surface of the middle of the insulation sleeve and the inner surface of the shell. A negative pole is embedded on a negative pole installation base, and the arc end of the negative pole extends out of the lower end of the insulation sleeve to be located in the positive pole. An arcing distance 2-8 mm long is kept between the arc end of the negative pole and a nozzle of the positive pole; an air inlet pipe is located at the upper end of the shell and communicated with the space of the air chamber formed between the insulation sleeve and the shell. The taper angle beta of the arc end of the negative pole is 40 degrees. The taper angle alpha of a contraction section of the positive pole is 60-90 degrees. Eight swirling holes with the spiral angle of 45 degrees are evenly distributed in an end surface of the swirler, and work media passing through the swirler generate swirling flow. The elongating arc plasma jet ignition device has the advantages of being high in flame spreading speed, high in penetrating power and rich in active air plasma.

The invention discloses a method for locking laser wavelength for gas detection. The method comprises the steps of sending out laser scanning signals in a step-by-step way at regular time, pushing in a gas reference cell in a detection light path; selecting at least one point location in a space scanning range, changing a little current every time when a space is scanned, continuously collecting for at least one scanning cycle, and producing an absorption spectrum according to the obtained optical signals; adjusting the laser wavelength according to gas absorption positions in the absorption spectrum. The invention also provides a device for locking the laser wavelength for gas detection. Compared with an original method and an original device, according to the method and the device provided by the invention, a set of laser beam splitter and a set of reference light detection circuit are reduced, the laser output light intensity can be completely used for detecting, long-range detection is carried out favorably, and the cost can be also reduced because of the reduction of the reference light detection circuit.

The invention relates to an ohm law digital demonstrating instrument. The instrument comprises a control unit, a voltage display module, a current display module and a resistance display module, wherein the voltage display module, the current display module and the resistance display module are connected with the control unit. According to the ohm law digital demonstrating instrument, an adjustable power supply is arranged inside; the current in the circuit can be conveniently changed by adjusting the experimental power supply voltage during experiment so as to obtain different voltage and current in the circuit; the condition that the resistance of some conductors changes as the temperature or current changes can be directly observed, such as the change of the resistance of a small bulb under different currents.

The invention discloses a lamp capable of automatically changing light brightness and the shape of a lamp body, and an adjusting method thereof. The lamp comprises an infrared detection unit for inducing whether life exists or not, a control and regulation unit and the telescopic lamp body, wherein the control and regulation unit is respectively connected with the infrared detection unit and the telescopic lamp body for receiving a detected signal of the infrared detection unit to control a transmission telescoping mechanism so as to change the shape of the lamp body and the light brightness. The adjusting method comprises the following steps: firstly, detecting whether a person exists or not through the infrared detection unit, enabling the transmission telescoping mechanism to perform alternate contraction and expansion motion repeatedly, simultaneously driving a sliding rheostat to slide to show dark and bright effects alternately, enabling the lamp to become dark gradually along with the increase in amplitude, enabling the lamp to be in contraction state after completing the contraction and expansion motion three times, enabling the light to be weak and enabling the lamp to be in a power-saving mode. The lamp disclosed by the invention can solve the technical problem of enabling the lamp to automatically change the light to the power-saving mode and simultaneously change the shape when the lamp detects that no person exists in an indoor environment.

The invention discloses a magnetic force flexible pivot which comprises two parts including a stator and a rotor. A magnetic force manner is adopted for determining that the rotor has no friction rotation; the stator is provided with a blade type anti-rotation permanent magnet, and magnetic force between the blade type anti-rotation permanent magnet and an anti-rotation magnet of the rotor provides high-repeatability rotation resistance; the stator is provided with a thrust magnet, a thrust bearing manner is formed by the thrust magnet and a thrust permanent magnet of the rotor, and friction-free axial bearing force is provided; and the thrust magnet and the anti-rotation magnet on the stator have three achievement manners including permanent magnet, electromagnetism and compounding, and three manners including the permanent magnet magnetic force flexible pivot, the electromagnetic magnetic force flexible pivot and the compounding magnetic force flexible pivot are formed. The flexible pivot has the beneficial effects that friction is avoided, lubrication is avoided, the action face is large; the high-repeatability rotation resistance is provided, the limitation of the using time number of an existing cross-shaped spring type flexible pivot is eliminated, the extremity of the service life is avoided, the axial bearing force and the rotation resistance are controllable and adjustable, and flexibility and reliability are achieved.

The invention discloses an autotransformer, which comprises an upper bracket and a lower bracket. The upper and the lower brackets are respectively provided with transmission plates made of plastic. The transmission plates are connected with three coil columns. Coils are arranged outside the coil columns. Iron cores are arranged inside the coils. Protective layers are arranged on the surfaces of the coils. The autotransformer can be applied to a large-scale transformer substation to effectively change voltage and current. The manufacturing work and method are convenient and the manufacturing cost of is saved. The autotransformer is internally provided with an absorbent to remove moisture inside, is good in safety performance and not easy to be shocked by electricity. Spray paint is sprayed on the coils, so that the service life is effectively prolonged. The autotransformer is a scheme with a novel design and is beneficial to popularize.

The invention discloses an acupuncture anesthesia device which comprises an anesthesia shell and a positioning mechanism. A slide rheostat is arranged in the anesthesia shell, a pushing mechanism is arranged on the front side of the slide rheostat, three take-up mechanisms are arranged on the left side of the anesthesia shell, the take-up mechanisms are connected with a positioning mechanism through wires, and a supporting mechanism is arranged on the bottom side of the anesthesia shell; the positioning mechanism comprises a rubber pad; a fixed cylinder is arranged on the rubber pad; an electrifying ring is fixedly arranged on the inner side surface of the fixed cylinder; the inner side surface of the fixed cylinder is in threaded connection with a limiting cylinder; a rubber clamping block is fixedly arranged on the upper surface of the rubber pad; a snapping trough is arranged on the upper surface of the rubber clamping block; and the left side and the right side of the rubber pad are respectively provided with an elastic bandage; according to the acupuncture anesthesia device, a needle and a wire which are inserted into a certain acupuncture point can be fixed, the situation that the pain of a patient is increased due to the fact that the needle tip tilts is avoided, the needle can be prevented from falling off, and the acupuncture anesthesia device is convenient to use by auser.

The invention discloses a drilling cuttings amount testing device based on a pressure sensor. The device comprises a hollow drill rod, a drill bit, spiral plates, a slide rheostat, a data converter and a display, the spiral plates are correspondingly arranged on the front sides of the front ends of spiral blades in parallel, a plurality of springs are arranged between the rear side faces of the spiral plates and the spiral blades, and L-shaped connecting rods are fixedly connected to the rear side faces of the spiral blades. The slide rheostat is arranged in the hollow drill rod and positionedon the rear side of the L-shaped connecting rod. One end, inside the hollow drill rod, of each L-shaped connecting rod is connected with a sliding piece of the slide rheostat through a driving rod, abinding post of the sliding rheostat is connected with the data converter through an electric wire, the data converter is connected with the display through a control line, and a power switch and a node button are arranged on the display. The invention further discloses a testing method of the drilling cutting amount testing device based on the pressure sensor. The device is scientific in principle, simple in structure, convenient to operate, high in safety and reliability, capable of conducting testing in real time and high in testing data accuracy.

The invention discloses a novel SMD lamp bead comprising a base and LED chips. The base is provided with a packaging stand and conductive sheets which are arranged on the packaging stand and used for being connected with the LED chips. The packaging stand is provided with four conductive sheets, and each conductive sheet extends towards the outside from inside along the packaging stand to the two sides of the external part of the packaging stand to form conductive pins. The conductive sheets are symmetrically arranged on the base in a way that every two conductive sheets are grouped. The LED chip is connected between the two conductive sheets of each group. A packaging layer for packaging the LED chips covers the packaging stand. After the SMD lamp bead is formed through packaging, series-parallel switching can be realized by changing the connecting mode of the conductive pins and the external circuit so that the current and the voltage required for normal working of the lamp bead can be changed and the structure is practical and reliable.

The invention discloses a thread passing device in an embroidery machine, which comprises a thread passing box, the interior of the thread passing box is divided into a plurality of middle thread passing cavities by a plurality of partition plates, the thread passing box is provided with a thread inlet hole and a thread outlet hole which are communicated with the middle thread passing cavities, and a rotating gear and a tension adjusting block are arranged in each middle thread passing cavity. The waxing hole is connected with a wax feeding groove internally provided with a first magnetic plate, an elastic bag, a second magnetic plate and a wax block, a series circuit which is electrically connected with a power source through a wire, a driving motor and a resistance rod is arranged in the middle wire passing cavity, and the driving motor is provided with a driving gear. During use, the tension of the embroidery thread is adjusted by pulling the tension adjusting block, the embroidery thread is waxed by arranging the wax block, the embroidery effect of the embroidery thread is improved, the fixed power connection block and the sliding power connection block are arranged in a matched mode, and therefore the embroidery thread is more attractive in appearance and more attractive in appearance. Therefore, the waxing of the embroidery thread is more accurate and controllable.

A dimming LED constant-current driving circuitis used for providing working voltage for a dimming module through a voltage dividing module so as to enable the dimming module to output a pulse modulation and demodulation signal to a constant-current driving module to change the magnitude of current output by the constant-current driving module. Further, the input current of a series LED lamp group connected with the output end of the constant-current driving module can be controlled, and the lighting brightness of the series LED lamp group can be changed. A sampling module is used for sampling the current of the series LED lamp group. The constant-current driving module no longer increases the current of the series LED lamp group when the current of the series LED lamp group reaches a rated current value, so that over-current of the series LED lamp group is avoided.

The invention relates to the technical field of micro-pipelines, and particularly provides a magnetic control micro-pipeline which is characterized in that two end faces of an electromagnet are respectively connected with one end of a first iron yoke and one end of a second iron yoke, two ends of a magnetostriction material part are respectively and fixedly connected with the other end of the first iron yoke and the other end of the second iron yoke, and a hole is formed in the magnetostriction material part; a micro-pipeline is formed, wherein the direction of the micro-pipeline is perpendicular to the direction of a connecting line of the first iron yoke and the second iron yoke. During application, the electromagnet generates a magnetic field, the magnetic field of the magnetostrictionmaterial part is changed through the first iron yoke and the second iron yoke, and the magnetostriction material part generates a magnetostriction effect, so that the shape and the sectional area of the micro-pipeline are changed, and the conduction characteristic of the micro-pipeline is changed. The magnetic control micro-pipeline has the advantages of being easy to operate and high in control precision.

The invention relates to a Hall sensor capable of detecting incident light intensity, comprising a substrate layer, a metal layer arranged above the substrate layer, a light-transmitting conductive layer arranged above the metal layer, and a plurality of metal strips arranged in parallel above the light-transmitting conductive layer. The left and right sides of the light-transmitting conductive layer are provided with electrodes; Magnetic poles are arranged on the front and rear sides of the light-transmitting conductive layer. The Hall sensor which can detect the intensity of incident light can change the current of the sensor through the influence of light on the electric field of the Hall effect, and reflect the change of the light through the detection of the current. The Hall sensor not only has simple structure, but also has high sensitivity, in particular, for light of specific frequency capable of resonating with Fabry-Perot cavity. By changing the voltage applied to the transparent conductive layer, the response of the transparent conductive layer to the light of different frequencies can be adjusted, the resonant frequency of the Fabry-perot cavity is changed so that theresonant frequency can be adjusted.

The invention discloses a limited bipolar circuit and method, and belongs to the technical field of power electronics. A PWM device SG3525, a phase inverter, an NAND gate and a double-D trigger are utilized to output a limited bipolar soft switching circuit driving signal with adjustable frequency, wherein the SG3525 generates a driving pulse width with an adjustable width; meanwhile, the pulse signal is utilized and combined with a pulse signal of a fourth pin of the SG3525, and finally, a driving signal with a fixed pulse width is output by the double-D trigger through level conversion and logic operation of the inverter and the NAND gate; and the equivalent resistance to the ground of the sixth pin of the SG3525 is indirectly controlled through an external level, so that the frequency of the driving pulse can be changed. The control method can be applied to any soft switching circuit needing to use a limited bipolar control mode, so that the application field is extremely wide.

The invention discloses an SMD surface mount support including a plastic base. The plastic base is provided with a packaging table and conductive sheets arranged on the packaging bench and used for connecting LED chips. The packaging bench is provided with four conductive sheets. The conductive sheets extend from inside to outside along the packaging bench to the two sides outside the packaging bench to form conductive pins. The packaging bench is provided with positioning slots matching the conductive sheets. The conductive sheets are embedded into the positioning slots, and are flush with the end faces of the packaging bench. The SMD surface mount support is simple and practical. After SMD lamp beads are formed through packaging, series-to-parallel switching can be realized by changing the way of connection between the conductive pins and an external circuit, and thus, the current and voltage required for normal work of the lamp beads can be changed.