55results about "Resistors adjusted by short-circuiting resistive elements" patented technology

The invention discloses a potentiometer. The potentiometer comprises a resistive element, an insulation base supporting the resistive element, an electric brush and a rotating handle driving the electric brush to rotate, wherein the resistive element is circular-fan-shaped, a first limiting baffle block and a second limiting baffle block are respectively arranged at two end parts of the resistive element, the electric brush and the rotating handle are installed at the circle center of the resistive element, the section of the electric brush is step-shaped; the thickness of the part, close to the resistive element, of the electric brush is greater than the thickness of part, close to the rotating shaft, of the electric brush; a plurality of raised adjusting gear blocks are arranged between the first limiting baffle block and the second limiting baffle block along the arc-shaped circumferential surface of the insulation base, and a positioning groove positioned above the raised gear adjusting blocks is formed in the rotating handle. The rotating handle drives the electric brush to rotate to adjust the value of resistance, so that unnecessary friction during rotating process of the electric brush is effectively reduced, the raised adjusting gear blocks are used for adjusting and controlling gears, and the second rotating shaft can move up and down relative to the first rotating shaft, so that gear locking and adjusting is realized.

The device for detecting and tracking a status of a device under laser trim includes: a series connected string of trim tracking links; and a plurality of detecting devices wherein each detecting device is coupled in parallel with a corresponding trim tracking link. This device allows detection of laser beam to work surface misalignment and the termination of lasing before critical active circuit components can be damaged.

A method of manufacturing a ferromagnetic tunnel junction element, having an insulating film, a first ferromagnetic film and a second ferromagnetic film, including a step of turning the ferromagnetic tunnel junction element on electricity for a given period before a practical operation of the ferromagnetic tunnel junction element, so that a resistance of the insulating film is stabilized.

A variable potentiometer with a wiper terminal and first and second terminals has relay switches for shorting or for unshorting resistors. When resistance is reduced between the wiper and one of said terminals, resistance is increased between the wiper and another terminal. In one embodiment two strings of resistors with the same nominal values are used between the wiper and the terminals. In another embodiment, a single string of resistors are used and are switched into either the electrical connection between the wiper and the first terminal or between the wiper and the second terminal. When resistance is lowered between the wiper and one of said first or second terminals a first resistor is replaced with a first short circuit and when resistance is increased between said wiper and another of said first and second terminals a second short circuit is replaced with the first resistor.

The invention discloses a protective resistor for use in an ultrahigh-voltage very fast transient overvoltage test, which comprises a connecting flange, a resistor body, middle uniform rings and end uniform rings, wherein the resistor body comprises an insulating barrel which is wounded with at least two layers of resistance wires; both of the two ends of the insulating barrel are connected with a connecting flange by a middle uniform ring; the other end of each connecting flange is connected with an end uniform ring; spiral grooves are formed on the outside surface of the insulating barrel; the resistance wires are wound in the spiral grooves; and the outside surface of the insulating barrel is wounded with an epoxy glass silk ribbon and cured after being wounded with each layer of resistance wires. When the embodiment of the invention is used, the structural deformation or insulation damage of the protective resistor used outdoor are prevented.

The invention belongs to the technical field of electric parameter measurement, and provides a shunting element for a printed circuit board. The shunting element is formed by bending a strip-type metal sheet, wherein at least one notch is formed in each of the opposite first and second ends of the strip-type metal sheet, so that the first end is divided into at least one first-type pin and at least one second-type pin, and the second end is divided into at least one third-type pin and at least one fourth-type pin; the width of the first-type pin is greater than that of the second-type pin, and the width of the third-type pin is greater than that of the fourth-type pin. The shunting element is integrally machined by using the strip-type metal sheets, and is simple in structure; the resistance of a finished product is not required to be regulated, so that manufacturing procedures are simplified; at the same time, a conventional terminal sheet part is rreduced, so that a resistance value can be increased or decreased according to actual needs, and the shunting element is high in flexibility; moreover, a welding procedure is not required, so that the shunting element has the advantage of small temperature drift.

The invention relates to a program-controlled multi-channel variable resistor and a resistance value adjustment and control method thereof. The variable resistor comprises a communication interface, a multi-channel resistance output interface, a single-chip microcomputer and at least one single channel, wherein the communication interface is connected with an upper computer of a control system, each single channel comprises a digital potentiometer and an electro-static discharge protection chip which form a series branch, communication is carried out between the single-chip microcomputer and a serial port conversion module by a universal asynchronous receiver/transmitter (UART) three-wire interface mode, the single-chip microcomputer and the digital potentiometers are arranged through an I<2>C communication mode, or the tap position or the resistance value of the current digital potentiometer are read. The adjustment and control method comprises the following steps of 1) testing a serial port; 2) carrying out direct program-controlled reading and adjustment on the resistance value of the digital potentiometer of an appointed channel; and 3) periodically calibrating the resistance value of the digital potentiometer of each channel by a multimeter. The program-controlled multi-channel variable resistor and the resistance value adjustment and control method thereof have the advantages of simplicity in composition, convenience in use and accurate and reliable resistance value, the embedded software of the single-chip microcomputer can use the resistance value correction linear coefficient of each channel to automatically correct the resistance value, and the accuracy of the resistance value of the variable resistor is guaranteed.

The invention discloses a slide rheostat. The slide rheostat comprises a base and a turntable, wherein an annular conductor is fixedly arranged on the base, a plurality of sub conductors are distributed on the periphery of the annular conductor at intervals, the turntable is rotatably connected with the base, two metal slide sheets are arranged on the turntable, one ends of the two metal slide sheets are electrically connected with the annular conductor, the distance between the other ends of the two metal slide sheets is greater than the interval between two adjacent sub conductors, when the turntable rotates, the other ends of the two metal slide sheets are simultaneously electrically connected with the same sub conductor, the annular conductor is connected with a current input end through a common resistor, and each sub conductor is connected with a current output end through a resistor. The two metal slide sheets of the slide rheostat can rotate clockwise, and also can rotate anticlockwise, the rotation angles are not limited within 360 degrees, and the use is relatively convenient and flexible; after the slide rheostat is applied to an electronic product, the electronic product is relatively convenient to use, so that the user experience on the electronic product is improved.

The invention discloses a numerical control rheostat based on a weighting switching network, which comprises the weighting switching network and a numerical control resistor. The weighting switching network receives an N bit binary digital signals, the N is a positive integer, the numerical control resistor comprises 2N resistors which have equal ohms and are sequentially connected in series, the weighting switching network comprises N analogue switches, each analogue switch receives one bit binary digital signals, obtains respective weight according to weight of the received binary digital signal and then is in parallel connection with the resistors which have the quantity equal to the weight and are sequentially in series connection, and each resistor is in parallel connection with one analogue switch at most. The numerical control variable resistance can be achieved by the weighting switching network formed by the N analogue switches only, and cost is greatly reduced.

The invention relates to the technical field encoder parts and particularly relates to a potential encoding integrated structure. The potential encoding integrated structure comprises an electric brush plate and a resistance carrier plate, wherein the electric brush plate is used for conducting electricity; one side of the resistance carrier plate is provided with a conducting ring and a plurality of conducting strips surrounding the conducting ring; the other side of the resistance carrier plate is provided with a plurality of welding holes corresponding to the conducting strips; the welding holes are electrically connected with the corresponding conducting strips; and a resistor is electrically connected between every two adjacent welding holes. Through the arrangement, integration of the encoder and a potentiometer is realized, i.e. the encoder and the potentiometer are combined into one whole body; better conditions are created for saving limited space of electronic equipment and reducing the size of the electronic equipment; the potential encoding integrated structure has a simple structure, is low in cost and provides conditions for integration of the encoder and the potentiometer.

The invention provides a numerical control variable-resistance device. The numerical control variable-resistance device comprises a first port A, a second port B and a voltage adjusting circuit connected between the first port A and the second port B. The voltage adjusting circuit comprises a standard resistor R, an offset voltage source US and a numerical control voltage source U with the variable output voltage. The offset voltage source US is used for offsetting voltage drop at the two ends of the standard resistor R through a reversal-phase follow circuit (2), wherein one end C of the standard resistor R is connected with the first port A, and the other end D of the standard resistor R is connected with the output end US- of the offset voltage source; the reference ground wire end US+ of the offset voltage source US is connected with the reference ground wire end U+ of the numerical control voltage source U; the output end U- of the numerical control voltage source is connected with the second port B; the output end US- of the offset voltage source US is connected with the reference input end of a digital-to-analogue conversion circuit (3) in the numerical control voltage source to provide the reference end voltage for the numerical control voltage source. The numerical control variable-resistance device has the advantages that the simulation output resistance is stable, the definition is adjustable, and the simulation resistance scope is wide.

The invention discloses a rotatably controlled electronic switch. The rotatably controlled electronic switch comprises a shell; a horizontally arranged threaded rod is rotatably installed in the shell; a vertically arranged movable plate is in threaded installation outside the threaded rod; one end of the threaded rod extends to the exterior of the shell; two guide holes are formed in the movableplate; two horizontally arranged guide rods are fixedly installed in the shell; the guide rods pass through the movable plate through the guide holes; a horizontally arranged metal strip is fixedly installed in the shell; the metal strip is positioned over the movable plate; furthermore, a first sliding opening is formed in the metal strip; a second sliding opening is formed on the top of the shell; the first sliding opening corresponds to the second sliding opening; an installation cover is fixedly installed on the top of the shell; a vertically arranged metal rod is fixedly installed on thetop of the movable plate; and the top of the metal rod extends into the installation cover through the first sliding opening and the second sliding opening. The rotatably controlled electronic switchdisclosed by the invention is smart in structure, simple in structure, convenient to operate and low in manufacturing cost and maintenance cost, and has the multi-level adjustment effect.

A chip component is provided with a block including a dielectric, input and output terminals, which are the first and second terminals that are provided on the surface of the block, an adjustment terminal that is a third terminal that includes an internal electrode extended into the block and that is provided on the surface of the block, and at least two inter-terminal circuits that are provided in the block and that are connected between at least two sets of two terminals of the first, second, and third terminals.

A small inexpensive two terminal variable resistance assembly that conveniently changes its resistance when a force of an actuator is applied. It can be made for power applications as well as in miniature dimension versions in values from milli-ohms to meg-ohms. This variable resistor increases its power handling capacity during a decrease in its ohmic value, contrary to present three terminal potentiometers or reostats. It does this by a rolling action that increases or decreases two resistive surface areas in parallel. It could also be used as a variable capacitor.