63results about How to "Change the resistance value" patented technology

The invention provides a digital closed loop type optical fiber current sensor. A modulation signal of a light wave phase modulator of a sensor optical path system is an amplitude modulation square wave; a signal processing system extracts any harmonic wave of amplitude modulation square wave current output by a photoelectric transducer and extracts tested current information from the current; a pre-amplifier of the signal processing system is a transimpedance amplifier TIA, and the bandwidth is below 1 / 650 when the square wave transient amplitude value (prior art) is directly extracted from the amplitude modulation square wave, so that thermal noise output by the pre-amplifier and the shot noise level are also reduced to be below 1 / 650 of the prior art; and current-voltage conversion gain of the transimpedance amplifier TIA is not determined by the resistance of a feedback network of the TIA, so that a low-resistance resistor is adopted in the feedback network of the TIA while the high current-voltage conversion gain is ensured, and the thermal noise of the resistor which accounts for a significant proportion in the level of the noise output by the TIA is reduced to be negligible.

The invention relates to the CCD driving technology, more particularly to a system for realizing drive of an EMCCD signal by a transformer. According to the invention, problems that a current driving method has high power and is difficult to be realized can be solved. An amplitude adjustment of an output signal of the system is carried out by changing a resistance value of a digital potentiometerin a first adjustable voltage transformer, so that an output voltage of the first adjustable voltage transformer is changed and thus a primary coil voltage of a high frequency transformer; therefore,a digital control on the output signal amplitude is realized; according to a digital parameter value received by the second adjustable transformer, a resistance value of a digital potentiometer in the second adjustable transformer is changed, thereby changing an output voltage value in a DC-DC boosted circuit; and a direct current polarization is provided for an RLC resonant circuit through a direct current level clamped circuit, so that the high and low levels of the output signal are still in a normal working range after the change of the amplitude value of the output signal each time. According to the invention, circuit power consumption and dependence on a high speed and high power device are substantially reduced.

The invention provides a spring and electromagnetism assist damping device. The spring and electromagnetism assist damping device comprises an upper shell, a lower shell, a circuit box, a supporting device, an energized solenoid and a support, wherein the upper shell can move upwards or downwards relative to the lower shell, the circuit box comprises a variable resistor and a power source, the circuit box is connected with the supporting device and the energized solenoid respectively, and the supporting device comprises a pressure plate, a magnet and a spring. A clamping groove welded to the pressure plate can drive a sliding block on a slide rheostat to move at the same time. Because of movement of the sliding block on the slide rheostat, resistance of the slide rheostat changes so as tochange the electric current in a circuit, the magnetic field intensity of the energized solenoid is changed then, the magnitude of magnetic field repulsive force between the energized solenoid and thedisk-shaped magnet is changed, and the spiral spring is assisted with damping. Leakproofness of the whole spring and electromagnetism assist damping device is kept, a damping effect is enhanced, andthe service life of the damping spring is prolonged. The spring and electromagnetism assist damping device has the advantages of being simple in structure, automatic in damping adjustment and applicable to various shock occasions.

The invention relates to the field of power battery systems, provides a vehicular power battery pack detection system and detection method and a vehicle and aims to detect whether power battery pack cooling media leak or not. The detection system comprises a medium absorption unit, a storage unit, a liquid level detection unit and a control unit. The medium absorption unit is used for absorbing aleaked cooling medium of a power battery pack and changes own resistance value after absorption of the cooling medium; the storage unit is used for storing the power battery pack cooling medium; the liquid level detection unit is used for measuring cooling medium capacity of the storage unit; the control unit is connected with the medium absorption unit and the liquid level detection unit and usedfor judging whether the cooling medium leaks from the power battery pack or not according to the own resistance value of the medium absorption unit and / or the capacity measured by the liquid level detection unit. The problem of cooling liquid leakage detection failure caused by failure in insulation resistance decline due to the fact that a small quantity of cooling liquid leaks or the leaked cooling liquid does not intrudes a direct-current circuit in the prior art is solved.

The invention discloses a piezoresistive composite tactile sensor and a production method. The tactile sensor comprises a first electrode structure layer, a piezoelectric force sensitive structure layer is disposed below the first electrode structure layer, a second electrode structure layer is disposed below the piezoelectric force sensitive structure layer, and a flexible insulating layer is disposed below the second electrode structure layer. A third electrode structure layer is arranged below the flexible insulating layer, a piezoresistance force sensitive structure layer is arranged belowthe third electrode structure layer, and a fourth electrode structure layer is arranged below the piezoresistance force sensitive structure layer. The piezoelectric force sensitive structure layer and the piezoresistance force sensitive structure layer realize the perception of external dynamic and static tactile mechanical signals. According to the packaged composite tactile sensor, a second substrate layer is arranged on the first electrode structure layer, and a first substrate layer is arranged below the fourth electrode structure layer. The produced composite tactile sensor has piezoresistive and piezoelectric sensing mechanisms at the same time, measurement of multi-modal mechanical parameters is achieved, and the composite tactile sensor can be applied to the fields of flexible wearable devices, intelligent robots and the like.

The invention relates to an equivalent leakage current error influence test device and a test method thereof. The device includes a voltage regulator, a test transformer, a standard transformer, a CVT test piece and a resistance body; power source voltage is connected into the primary sides of the standard voltage transformer and the CVT test piece through the test transformer and a current limiting resistor; the primary side of the test transformer is connected with the voltage regulator; one end of the secondary side of the test transformer is grounded, and the other end of the secondary side of the test transformer is connected with one end of the current limiting resistor; the other end of the current limiting resistor is connected with the primary side of the standard voltage transformer and the primary side of the CVT test piece; the secondary side of the standard voltage transformer and the secondary side of the CVT test piece are both connected with a transformer calibrator; and the resistance body is connected in parallel with two ends of a single capacitor unit of the CVT test piece so as to simulate equivalent leakage current. With the equivalent leakage current error influence test device and the test method thereof of the invention adopted, the leakage current situation of the CVT due to rain and dust is successfully simulated, and it is verified that the accuracy of the CVT can still satisfy a requirement for a high accuracy grade under the leakage current situation.

The invention specifically relates to a square wave and sawtooth wave generation circuit based on a memristor. The invention has the technical scheme that the square wave and sawtooth wave generation circuit consists of an in-phase input hysteresis comparator (1), an integral circuit (7) with an adjustable charging and discharging time constant, a first variable gain amplification module (14), a second variable gain amplification module (13) and a control module (12), wherein the control module (12) is respectively connected with the in-phase input hysteresis comparator (1), the integral circuit (7) with the adjustable charging and discharging time constant, the first variable gain amplification module (14) and the second variable gain amplification module (13). The square wave and sawtooth wave generation circuit based on the memristor has the advantages of simple structure, high precision, good stability and easiness in realizing automatic control.

The invention relates to a torque sensor (10), in particular for detecting torques occurring on or in a joint of an articulated arm robot. The sensor comprises a number of measuring spikes (1, 2, 3, 4) that are designed to deform under the effects of torque, and a number of strain gauges (DR11, DR12, DR21, DR22, DR31, DR32, DR41, DR42), wherein two respective strain gauges are arranged on two opposing sides of the several measuring spikes (1, 2, 3, 4). In addition, a number of strain gauges are each connected in one of at least two bridge circuits.

The invention relates to a novel electronic scale which comprises a shell, a pressure-sensitive bedplate, an MCU singlechip connected with the pressure-sensitive bedplate, a control button connected with the MCU singlechip, a display unit connected with the MCU singlechip and a power supply unit of an electronic element, wherein the shell is provided with a loading panel, the pressure-sensitive bedplate is arranged below the pressure-sensitive bedplate in the shell, the MCU singlechip and the power supply unit are arranged in the shell, and the control button and the display unit are arrangedon the shell. By using the pressure-sensitive bedplate as the sensing element, the invention achieves the advantages of light and thin structure, good using effect and durability, and simplifies the elements of the electronic scale. Therefore, the overall structure of the electronic scale is simpler and can be lighter and thinner, and the appearance can be more beautiful.

An electromagnetic input device comprises a protruding part, a pressure-sensitive module, a conductive module, and a control unit. The pressure-sensitive module comprises a circuit board and a capacitor. One surface of the circuit board is provided with a printed carbon film resistor. The capacitor is disposed on the circuit board. The capacitor and the carob film resistor form an RC circuit which has a time constant. The conductive module is connected with the protruding part. At least part of the conductive module is used for contacting with the carbon film resistor. Resistance of the carbon film resistor changes with changes in contact area of the conductive module with the carbon film resistor, so that the time constant changes correspondingly. The control unit is electrically connected with the RC circuit and used for detecting the time constant. When bearing external force, the protruding part drives the conductive module to move, the contact area of the conductive module with the carbon film resistor changes, the time constant changes along, and the control unit controls input line width of the electromagnetic input device according to the time constant. Through the application of the electromagnetic input device, the problems that the pressure-sensitive measuring component is complex to manufacture and low in sensing sensitiveness can be improved.

The invention discloses a heat preservation and moisture preservation device with an automatic adjusting function for a department store. The heat preservation and moisture preservation device comprises a base and a framework shell, wherein the base is of a hollow structure, a power switch, the framework shell and a storage battery device are mounted in a cavity of the base, the framework shell isfixedly connected to the upper end surface of the base, the movement of a copper pointer changes the resistance value, so that the current value changes, further, the heating power of a first heatingresistance wire, an object carrier and a second heating resistance wire is changed, and the supply of heat energy is reduced. Due to the combined movement of a piston, a connecting rod and a lever, the piston stops the flow rate of water flow in a cavity of a water pipe, thus the rate of a titration nozzle in dripping water to a water tank is reduced, and the evaporation of the water in the watertank can satisfy the humidity of the residual food. Along with the selling of the food, the inside energy supply is automatically adjusted along with the reduction of the weight of the food, and thusthe cost needed by energy supply is greatly saved.

The invention discloses an indoor wall surface drying device comprising two movable bases. The upper ends of the bases are provided with two support rods of the same structure, the support rods are provided with threaded holes, the threaded holes of one support rod are provided with a first drying plate, a second drying plate is mounted on the right side face of the first drying plate, a third drying plate is mounted on the right side face of the second drying plate, the third drying plate is fixed on the other supporting rod, the first drying plate, the second drying plate and the third drying plate are provided with ventilation openings, the ventilation openings are provided with shutter leafs, and electric heating wires and fans are arranged in the three drying plates. Since the deviceuses the two support rods of the same structure to support the three drying plates, the device can be moved to the wall surface to dry the wall surface. The fans are additionally arranged so that aircirculation can be accelerated, and wall drying can be further promoted. In addition, the device is movably installed and combined together, so that movement of the device is facilitated.

The present invention relates to an input device for game machine. An input device for a game machine for inputting signals to a game machine using a computer, including: at least one control member projecting to the outside of a casing; a movement-transmitting member formed around the control member and operatively associated with the movement of an operating point of the control member, the movement-transmitting member being provided with a plurality of conductive elastic members; and a board provided in the casing and having formed thereon resistors corresponding to the conductive elastic members, the conductive elastic members changing the area of contact between the conductive elastic members and the resistors according to a direction of movement and a tilt angle of the operating point of the control member.

The invention discloses automatic washing equipment. The equipment comprises a wash basin, a faucet and a hand sanitizer faucet, a slide temperature adjustment piece mounted on the wash basin, a watertreatment device, a hand sanitizer mixing device and a temperature adjustment device, wherein the water treatment device and the hand sanitizer mixing device are mounted below the wash basin; the temperature adjustment device is mounted at the lower end of the wash basin and connected with the lower end of the slide temperature adjustment piece; the slide temperature adjustment piece is made froma heat conducting material; a slide rheostat is mounted on the lower end face of the wash basin; one side, close to the slide rheostat, of the lower part of a handle part is fixedly connected with arheostat connecting plate arranged vertically; the water treatment device comprises a box body and a heater; the hand sanitizer mixing device comprises a housing, a hand sanitizer piston barrel mounted in the housing and a water tank located below the hand sanitizer piston barrel; and when the equipment is in use, a user senses a temperature via a hand put on the handle part, moves the handle partlocated on the surface of the wash basin till the temperature is appropriate and puts the hand below a water outlet of the faucet.

The invention discloses automatic washing equipment which comprises a washing table, a water faucet, a liquid soap faucet, a sliding temperature adjustment piece mounted on the washing table, a water treatment device and a liquid soap mixing device which are mounted below the washing table, and a temperature adjustment device which is mounted at the lower end of the washing table and is connected with the lower end of the sliding temperature adjustment piece, wherein the sliding temperature adjustment piece is a heat conduction material; a sliding rheostat is mounted on the lower end surface of the washing table; one side, close to the sliding rheostat, of the lower part of a handle part is fixedly connected with a vertically arranged rheostat connection plate; the water treatment device comprises a tank body and a heater; the liquid soap mixing device comprises a shell, a liquid soap piston tube mounted in the shell and a water tank located below the liquid soap piston tube. During use, a user feels the temperature with a hand on the handle part, removes the handle part located on the table top of the washing table and puts the hand at a position below a water outlet of the water faucet when the handle part is removed properly.

An intelligent sign language perceptual glove includes a little thumb sleeve, a ring finger sleeve, a middle finger sleeve, an index finger sleeve, at least one flexible sensor disposed on the thumbsleeve and the thumb sleeve, the flexible sensor includes an outer cladding layer and an inner conductor therein, the outer cladding layer comprises an upper cladding layer connected up and down, lower overburden. A body cavity is arranged in the middle of the junction of the upper and lower sleeve layers, the length of the body cavity is smaller than that of the upper sleeve layer, Length of lower overlay, the hollow body cavity is filled with a flexible inner conductor, The two ends of the inner conductor are respectively connected with the inner ends of the No. 1 and No. 2 connecting wires,the outer ends of the No. 1 and No. 2 connecting wires are located outside the outer cladding layer, the inner conductor is a mixture of glue and conductive powder, the outer cladding layer is made of insulating material, and the inner conductor is arranged between the upper and lower cladding layers by means of injection or screen printing. This design is not only easy to apply to wearable equipment, good consistency, but also strong sensitivity and high accuracy.

A fever soft wire is provided, which can reduce magnetic leakage field to a large extent; a fever wire and a detection wire can practically perform short circuit at the time of abnormal fever, and can realize enhancement of production efficiency and processability. The fever soft wire (30) of the invention comprises a first soft wire element (10) and a second soft wire element (20) that are adjacently configured in substance in a manner of having a parallel part. The fever wires (2a, 2b) of the first and the second soft wire elements (10, 20) are interconnected in series or in shunt for electrification, the magnetic fields generated by the fever wires are counteracted mutually.

A composite concrete containing electric conducting cells used for shielding radio interference and electromagnetic wave, grounding unit, lightning protector, electrostatic eliminator, heating floor, expressway, etc is prepared from cement, sand, cobble, carbon material, and metal material. Its advantages are high electric conductivity, strength and stability, low cost and long service life.

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 device for testing a controller of a BLDC (brushless DC) motor. The device comprises a bottom plate, a single-chip microcomputer and a first oscilloscope, wherein a left support plate and a right support plate are arranged on the bottom plate, and a load motor and a tested motor are arranged on right side surfaces of the left and right support plates respectively; a shaftof the tested motor is in drive connection with a shaft of the load motor; adjustable resistor structures are connected to three-phase connection lines of the load motor; Hall sensing devices are mounted on three-phase connection lines of the tested motor respectively; each Hall sensing device comprises two binding posts, a U-shaped copper piece, a magnetic ring and a Hall sensor; each Hall sensor is connected with the single-chip microcomputer connected with a computer, and a virtual oscilloscope is arranged in the computer; the three-phase connection lines of the tested motor and a ground line are connected with the first oscilloscope. The coaxiality between the shaft of the tested motor and the shaft of the load motor can be improved, the torque of the load motor can be adjusted, and the test accuracy is higher.

The invention discloses a chronic disease medication reminding and recording device, which comprises a medication terminal and a mobile terminal, wherein the medication terminal also comprises a flow sensor, a single-chip microcomputer and a Bluetooth module; the flow sensor is arranged on one end, close to a nozzle, in a transverse pipe, the flow sensor is connected with the single-chip microcomputer, the single-chip microcomputer receives and processes liquid medicine flow data from the flow sensor, the liquid medicine flow data is transmitted to a mobile terminal through the Bluetooth module of the single-chip microcomputer to be displayed, and therefore, a patient can conveniently record the dosage and the medication time of the patient; and the flow sensor is arranged in the transverse pipe, medication flow is collected and transmitted to the single-chip microcomputer to be compared with a standard dosage, on one hand, the dosage is limited, on the other hand, dosage recording accuracy is improved, a voice reminding conversion circuit is arranged to ensure the stability of voltage and prevent the circuit from being burnt out, and a medication flow acquisition circuit is arranged to further improve flow data information acquisition accuracy.

The invention belongs to the technical field of LED lighting, and discloses a battery adaptation device for a handheld LED lighting lamp. The battery adaptation device comprises a mounting seat, a battery jar is arranged in the mounting seat, the battery jar is composed of a middle strip, a self-locking block and an arc angle pedestal, one end of the self-locking block is provided with a metal contact piece, the other end of the self-locking block is provided with a magnetic sheet, the self-locking block is elastically connected with the mounting base through an elastic resistance wire, and a rotating motor is arranged on the side, close to the elastic resistance wire, of the mounting base. Rapid adaptive connection of the LED lamp can be achieved through the four-way joint, the jack piece and the plug piece can be connected with a lamp set with a fixed plug, the bare connection terminal can be fixedly connected with a lamp set without a fixed plug, the self-locking contact piece can be automatically locked and connected with an electric wire which is short in wire end and cannot be wound, more application capacity is provided, different connectors can be connected, and assembling and connecting can be carried out in different modes.

The invention discloses an overheat self-outage type protection device for an xylopyrography machine. A pressing plate and a heating plate fixedly connected with the pressing plate are included. An anti-skid groove is formed in the pressing plate. A drawing box is placed in the anti-skid groove. A mini lamp and a photosensitive resistor are arranged on the inner top wall and the inner bottom wallof the drawing box correspondingly. Two seal boxes are symmetrically fixed in the drawing box. A first transparent plate and a second transparent plate are connected between the two seal boxes and areeach of a hollow structure. The middle portion of the first transparent plate communicates with the middle portion of the second transparent plate through a transparent pipe. Two sliding plugs are arranged in the second transparent plate in a sealing and sliding manner. A partition plate is arranged in each seal box. The overheat self-outage type protection device is simple in structure. When thetemperature of the heating plate exceeds the normal value, the heating plate can be powered off through resistance value changes of the photosensitive resistor, accordingly, the temperature of the heating plate is reduced in time, and printing stock damage is avoided.

The invention relates to the CCD driving technology, more particularly to a system for realizing drive of an EMCCD signal by a transformer. According to the invention, problems that a current driving method has high power and is difficult to be realized can be solved. An amplitude adjustment of an output signal of the system is carried out by changing a resistance value of a digital potentiometerin a first adjustable voltage transformer, so that an output voltage of the first adjustable voltage transformer is changed and thus a primary coil voltage of a high frequency transformer; therefore,a digital control on the output signal amplitude is realized; according to a digital parameter value received by the second adjustable transformer, a resistance value of a digital potentiometer in the second adjustable transformer is changed, thereby changing an output voltage value in a DC-DC boosted circuit; and a direct current polarization is provided for an RLC resonant circuit through a direct current level clamped circuit, so that the high and low levels of the output signal are still in a normal working range after the change of the amplitude value of the output signal each time. According to the invention, circuit power consumption and dependence on a high speed and high power device are substantially reduced.

The invention specifically relates to a square wave and sawtooth wave generation circuit based on a memristor. The invention has the technical scheme that the square wave and sawtooth wave generation circuit consists of an in-phase input hysteresis comparator (1), an integral circuit (7) with an adjustable charging and discharging time constant, a first variable gain amplification module (14), a second variable gain amplification module (13) and a control module (12), wherein the control module (12) is respectively connected with the in-phase input hysteresis comparator (1), the integral circuit (7) with the adjustable charging and discharging time constant, the first variable gain amplification module (14) and the second variable gain amplification module (13). The square wave and sawtooth wave generation circuit based on the memristor has the advantages of simple structure, high precision, good stability and easiness in realizing automatic control.

The invention discloses a thermal pressure sensor. When a springing cover is pressed, the springing cover is recessed into a heat resisting cavity, a friction column is pushed to move relative to a heat conductor, so that friction and acting are performed to generate heat, the temperature of the heat conductor is increased, the temperature of a heat resistance wire is increased along with temperature rise of the heat conductor, and resistance values are changed. The resistance variable of the heat resistance wire can be measured on the outer side of a base by a first electrode and a second electrode, so that deformation of the springing cover is calculated, and the stressed value of the springing cover is acquired.

The invention discloses a bearing with a changeable resistance value. The bearing with the changeable resistance value comprises a bearing inner ring, a bearing outer ring, a retainer and a plurality of rolling bodies, wherein the bearing inner ring and the bearing outer ring are made of metal materials, the retainer is arranged between the bearing inner ring and the bearing outer ring, and the rolling bodies are arranged on the retainer and located between the bearing inner ring and the bearing outer ring. Two conductive end covers are embedded in the two sides of the retainer respectively and located between the bearing inner ring and the bearing outer ring, and the resistance value of the bearing can be changed through the conductive end covers along with the change of the rotating speed of the bearing. The bearing with the changeable resistance value has the beneficial effects that the two conductive end covers are embedded in the two sides of the retainer respectively and located between the bearing inner ring and the bearing outer ring, the resistance value of the bearing can be changed through the conductive end covers along with the change of the rotating speed of the bearing, and thus the purpose of changing the resistance value is realized.