76 results about "Active resistance" patented technology

A maximum power point tracking method, applied to a tracking device, employs a DC / DC converter connecting with a solar cell array, and including a controller actuating the DC / DC converter to perform an active resistance characteristic; a maximum power point tracking circuit adjusting the active resistance of the DC / DC converter; monitoring a change of an output power of the solar cell array in determining a direction for adjusting the active resistance of the DC / DC converter; and the maximum power point tracking circuit repeatedly adjusting the active resistance of the DC / DC converter. If the change of the output power of the solar cell array is positive, the active resistance of the DC / DC converter is adjusted in the same direction; but, conversely, if the change of the output power of the solar cell array is negative, the active resistance of the DC / DC converter is adjusted in an opposite direction.

A lightweight orthopedic brace having no rigid structural elements is constructed from flexible material and is designed primarily to provide for restriction of rotational movement and translation about the target joint by providing flexible bracing members which wind in a circumferentially spiraling manner about a target joint to provide active resistance to axial rotation and translation in the joint. The embodiments of the invention disclosed here provide improved means for placing the invention on the body about a joint, improved means for attachment of bracing members to bracing member supports and improved means for adjusting the length of bracing member to selectively provide for restriction of rotational movement about the target joint.

A reference voltage generating circuit includes a current mirror circuit having first and second current paths formed between a first power source terminal and a second power source terminal in which the current mirror circuit is operated in response to a voltage level of the second current path, a reference voltage output node for providing a reference voltage and being located on the second current path, an active resistance device formed on the first current path to be operated in a linear region of a current-voltage characteristic curve of the active resistance device, and a voltage supply circuit for supplying the active resistance device with an enable voltage to control the active resistance device to be operated in the linear region.

The present invention discloses an LDO (Low DropOut) linear voltage regulator, which is based on an NMC (Nested Miller Compensation) architecture and can be capacitor-free, wherein an active resistor is added to the feedback path of the Miller compensation capacitor to increase the controllability of the damping factor, solve the problem of extensively using the output capacitor with a parasitic resistance, and solve the problem that a compromise must be made between the damping factor control and the system loop gain. Further, the present invention utilizes a capacitor-sharing technique to reduce the Miller capacitance required by the entire system and accelerate the stabilization of output voltage without influencing stability.

An electric-pulse-induced-resistance change device (EPIR device) is provided which is a resistance switching device. It has a buffer layer inserted between a first active resistance switching layer and a second active resistance switching layer, with both active switching layers connected to electrode layers directly or through additional buffer layers between the active resistance switching layers and the electrodes. This device in its simplest form has the structure: electrode-active layer-buffer layer-active layer-electrode. The second active resistance switching layer may, in the alternative, be an ion donating layer, such that the structure becomes: electrode-active layer-buffer layer-ion donating layer-electrode. The EPIR device is constructed to mitigate the retention challenge.

A maximum power point tracking method, applied to a tracking device, employs a DC / DC converter connecting with a solar cell array, and including a controller actuating the DC / DC converter to perform an active resistance characteristic; a maximum power point tracking circuit adjusting the active resistance of the DC / DC converter; monitoring a change of an output power of the solar cell array in determining a direction for adjusting the active resistance of the DC / DC converter; and the maximum power point tracking circuit repeatedly adjusting the active resistance of the DC / DC converter. If the change of the output power of the solar cell array is positive, the active resistance of the DC / DC converter is adjusted in the same direction; but, conversely, if the change of the output power of the solar cell array is negative, the active resistance of the DC / DC converter is adjusted in an opposite direction.

Disclosed is a muscle specific exercise device. The device may provide passive or active resistance training throughout an angular range of motion. The device may be low profile, and worn by a wearer, such as beneath conventional clothing. Exercise of selective joints or motion of the body may thereby be accomplished throughout the wearer's normal daily activities, without the need for access to conventional exercise equipment. Alternatively, the device may be worn as a supplemental training tool during conventional training techniques.

A method of noncontact measuring the electrical conductivity of electrolytes using a primary measuring transformer includes placing the electrolyte in a sampler, exciting an alternating magnetic field using an axisymmetrical eddy current sensor, switching to the sensor a capacitor of variable capacitance, tuning of the formed circuit in resonance with the frequency of the generator of harmonic oscillations, and recording the change in the introduced active resistance of the parametric eddy current sensor rated against its own inductive resistance.

Disclosed is a muscle specific exercise device. The device may provide passive or active resistance training throughout an angular range of motion. The device may be low profile, and worn by a wearer, such as beneath conventional clothing. Exercise of selective joints or motion of the body may thereby be accomplished throughout the wearer's normal daily activities, without the need for access to conventional exercise equipment. Alternatively, the device may be worn as a supplemental training tool during conventional training techniques.

Disclosed is a muscle specific exercise device. The device may provide passive or active resistance training throughout an angular range of motion. The device may be low profile, and worn by a wearer, such as beneath conventional clothing. Exercise of selective joints or motion of the body may thereby be accomplished throughout the wearer's normal daily activities, without the need for access to conventional exercise equipment. Alternatively, the device may be worn as a supplemental training tool during conventional training techniques.

An Electrostatic Discharge (ESD) protection circuit activates an ESD conduction circuit in response to an ESD event. A deactivation circuit generates an exponentially increasing deactivation signal in response to the ESD event, such that once the deactivation signal has increased to a trigger point of a control circuit, the ESD conduction circuit is deactivated. An active resistance component within the deactivation circuit incorporates a biasing element to maintain a resistance value of the active resistance component substantially constant over all operating conditions.

The invention relates to a nanometer coating used for preventing icing of a high tension transmission line and application thereof. The nanometer coating is prepared through the following steps: weighing, by weight, 10 to 15% of a high-molecular resin, 20 to 25% of titanium dioxide, 30 to 35% of silica, 3 to 5% of diamond-like carbon and 19 to 32% of a solvent; then compounding and uniformly mixing the high-molecular resin, titanium dioxide, silica and diamond-like carbon and carrying out grinding to obtain a particle with a particle size of 1 to 100 nm; and finally, adding the raw materials uniformly mixed and ground into the solvent and carrying out full stirring so as to obtain the nanometer coating used for preventing icing of the high tension transmission line. The coating provided by the invention allows the high tension transmission line to have the advantages of fouling resistance, icing resistance, high wear resistance and the like, provides a long-acting, high-efficiency, convenient, economic and feasible approach for active resistance to ice and snow disasters, realizes delaying and prevention of icing of super-cooled droplets on the high tension transmission line and enables no icing or little icing to be generated on the high tension transmission line in snowy weather.

A method and related apparatus for non-contact measurement of electrical conductivity of powder-like materials using eddy currents includes the steps of placing a powder to be measured in a hollow dielectric sampling container, the sampling container disposed and freely axially moving within an outer dielectric housing. An eddy-current sensor including a winding is arranged on an outside surface of the housing. Current is forced in the winding to excite the powder to generate eddy currents. The introduced active resistance is measured at the eddy-current sensor and an electrical conductivity of the powder is determined using the measured active resistance. The powder is preferably vibration compacted and the density and electrical conductivity determined at a plurality of stages during the vibration compacting step.

Provided are an active resistance-capacitance (RC) integrator and a continuous-time sigma-delta modulator, which have a gain control function. The active RC integrator includes an amplifier, a first base resistor connected between a first input node and a positive input port of the amplifier, a second base resistor connected between a second input node and a negative input port of the amplifier, a first resistor unit connected between the second input node and the positive input port of the amplifier, and a second resistor unit connected between the first input node and the negative input port of the amplifier. A resistor network including resistors and switches is configured to vary an input resistance, so that an active RC integrator may have a gain control function.

The invention discloses an automatic frequency tuning circuit of an active RC filter. The automatic frequency tuning circuit comprises comparators, a constant current source, a reference voltage generating circuit, a switched capacitor circuit and a digital logic control circuit. The automatic frequency tuning circuit is characterized in that the reference voltage generating circuit generates first reference voltage, second reference voltage and third reference voltage which are input to the first comparator, an operational amplifier and the second comparator respectively, voltage generated by the constant current source on the switched capacitor circuit is input to the operational amplifier, and the digital logic control circuit receives signals output by the first comparator and the second comparator, conducts operation treatment, outputs control codes to the switched capacitor circuit and adjusts the equivalent capacitance of the switched capacitor circuit. The automatic frequency tuning circuit is simple in implementation method, low in cost, small in volume, low in power consumption, high in tuning precision, good in application prospect and capable of being widely used in fields such as electronics and communication.

The invention provides a differential active inductor with a tunable high Q value, and relates to the technical field of radio frequency integrated circuits. The problem that an existing differential active inductor is large in real part loss and not high in Q value is solved. The tunable differential active inductor comprises a power source, an input and output end, a biasing circuit and a differential Cascode basic structure, and further comprises an active resistance feedback network. The active resistance feedback network is formed by connecting a passive resistor Rf and a PMOS transistor Mp3 in parallel, and the two ends of the active resistance feedback network are connected with the drain electrodes of a transistor Mn1 and a transistor Mn2 in the differential Cascode basic structure. The differential Cascode basic structure is composed of the transistor Mn1, the transistor Mn2, a transistor Mn3 and a transistor Mn4, the transistor Mn1 and the transistor Mn2 are connected with the transistor Mn3 and the transistor Mn4 in a cross-coupled pair mode, and the drain electrodes of the transistor Mn3 and the transistor Mn4 are connected with the source electrodes of the transistor Mn1 and the transistor Mn2. According to the differential active inductor with the tunable high Q value, tunability of the inductance value and the Q value of the differential active inductor can be achieved by tuning of the active resistance feedback network and the biasing circuit.

A transmit canceller comprises an operational amplifier having a first polarity input terminal, a second polarity input terminal, and an output terminal. A feedback element communicates with the second polarity input terminal and the output terminal. A first input resistor communicates with the second polarity input terminal and the measured signal input. A second input resistor communicates with the second polarity input terminal and the replica signal input. A predetermined voltage source communicates with the first polarity input terminal of the operational amplifier. The received signal is an output at the output terminal of the operational amplifier.

Provided are an active resistance-capacitance (RC) integrator and a continuous-time sigma-delta modulator, which have a gain control function. The active RC integrator includes an amplifier, a first base resistor connected between a first input node and a positive input port of the amplifier, a second base resistor connected between a second input node and a negative input port of the amplifier, a first resistor unit connected between the second input node and the positive input port of the amplifier, and a second resistor unit connected between the first input node and the negative input port of the amplifier. A resistor network including resistors and switches is configured to vary an input resistance, so that an active RC integrator may have a gain control function.

The invention provides a novel adjustable active inductor with great inductance and a high Q value, and relates to a radio frequency integrated circuit technology. The novel adjustable active inductor solves the problems that the existing active inductor has the disadvantages of lower equivalent inductance and Q value and smaller bandwidth. The inductor comprises an input / output end, a Cascode structure, a bias current source, an active resistance feedback and a shunt branch, wherein the active resistance feedback comprises a passive resistor and a second NMOS (N-channel Metal Oxide Semiconductor) tube which are connected in parallel; in addition, the two ends of the active resistance feedback are connected with a base of a second transistor and a collector of a third transistor respectively; the shunt branch comprises a first NMOS tube; and a drain of the first NMOS tube is connected with an emitter of the third transistor. According to the active inductor, the great inductance and the high Q value of the active inductor as well as tunability of the inductance and the Q value are realized by adjusting voltage of the NMOS tubes in the active resistance feedback and the shunt branch.

A method and related apparatus for non-contact measurement of electrical conductivity of of powder-like materials using eddy currents includes the steps of placing a powder to be measured in a hollow dielectric sampling container, the sampling container disposed and freely axially moving within an outer dielectric housing. An eddy-current sensor including a winding is arranged on an outside surface of the housing. Current is forced in the winding to excite the powder to generate eddy currents. The introduced active resitance is measured at the eddy-current sensor and an electrical conductivity of the powder is determined using the measured active resistance. The powder is preferably vibration compacted and the density and electrical conductivity determined at a plurality of stages during the vibration compacting step.

A touch sensor has a support layer (12) of an insulating material and a resistive layer (13) applied to the support layer. A resistive material is shaped according to an elongated pattern forming a sequence of touch positions, and has a single terminal (16) to be coupled to a sense input (17) of a detecting device (11), while an open end (15) of the sequence opposite to the terminal end remains unconnected. The detecting device detects an active resistance (Rp) between the single terminal and one of said touch positions that is touched by a user via a return capacitance constituted (Cu) by the user and a mass element (18) coupled to the detecting device. Advantageously only a single terminal is necessary, whereas a number of touch positions can be discriminated.

The invention relates to a hydraulic bracket linear displacement sensor detection device and a detection method. The linear displacement sensor detection device comprises an excitation mechanism and a displacement sensor detection body. The excitation mechanism comprises an extrusion magnetic horizontal excitation unit and a horizontal magnet-leakage resistance vertical extrusion magnetic unit. The displacement sensor detection body comprises a constant current source circuit, a reed tube detection circuit and a signal filter circuit. In the detection method of the sensor of the invention, the displacement value is converted into the change of the resistance value which is realized by a principle that the reed tube is conductive under a certain magnetic field strength; the constant current source drives the current to generate the voltage reduction at a load resistor; that the displacement value and the detected voltage form a linear relation so as to carry out the detection is realized by detecting the voltages at two ends of the load resistor. The linear displacement sensor of the invention has high detection sensitiveness and high measurement precision, and improves the anti-vibration performance of the linear displacement sensor of the invention by an active resistance low pass network.

A wheel testing system and method are provided that simulates realistically conditions likely to be encountered during operation of vehicle wheels, especially powered drive wheels and wheel-connected structures. The system may include an integral support frame designed to adjustably mount wheels or wheel-connected structures to be tested, a load motor drivingly connected to an inertial load, and an adjustable mounting sled configured to adjustably mount a test wheel or a wheel-connected structure with an hydraulic system actuatable to adjust the location of the test wheel relative to the inertial load to vary or fix the load on the test wheel desired. Speed of the test wheel can be varied or fixed by controlling the speed of the load motor. System measurement and data collection electronics measure a range of selected wheel parameters and gather data for transmission to a processor or non-transitory storage medium for processing and evaluation.

The invention provides an OLED display panel. The OLED display panel comprises a display device plate and a cofferdam; the cofferdam is arranged around a display area on the display device plate and is located at a non-display area; the OLED display panel further comprises an organic buffer layer covering the display area and a first inorganic layer covering the organic buffer layer and the cofferdam; the organic buffer layer is located on the inner side of the cofferdam, and the edge of the organic buffer layer is in contact with the inner side of the cofferdam. Beneficial effects are as follows: the surface of the cofferdam is treated by using plasma; under the oxidation action of the plasma, a hardened layer between organic silicon and inorganic silicon is formed on the surface of the weir body; active resistance to water and oxygen invasion of the side surface of the OLED display panel is facilitated, meanwhile, the plasma treated hardened layer can effectively promote the adhesionstrength of the inorganic layer and the cofferdam, and the risk of debonding and cracking at the edge of the first inorganic layer and the edge of the organic buffer layer in the bending process of the OLED display panel is reduced.

The invention belongs to the technical field of multi-mode radio frequency transmitters, in particular to a filter circuit with adjustable bandwidth and variable gain for a wideband code division multiple access (WCDMA) and global system for mobile communication (GSM) multi-mode transmitter. The circuit has a four-order active resistance-capacitance structure consisting of two Tow-Thomas dual second-order circuits which are connected in series, and comprises four operational amplifiers with the same structure, a bandwidth adjustment unit, a filter quality factor adjustment unit and a gain adjustment unit, wherein the operational amplifiers adjust unit gain bandwidth and direct current offset of the filter in two different modes; the bandwidth adjustment unit adjusts the cut-off frequency of the filter by varying the resistance-capacitance value; and the gain adjustment unit varies the gain by adjusting the resistance value on the premise of not varying the bandwidth of the filter. By using the circuit, the filter function and the gain adjustment function in the multi-mode transmitter can be realized with low power consumption by using a simple circuit.

A touch sensor has a support layer (12) of an insulating material and a resistive layer (13) applied to the support layer. A resistive material is shaped according to an elongated pattern forming a sequence of touch positions, and has a single terminal (16) to be coupled to a sense input (17) of a detecting device (11), while an open end (15) of the sequence opposite to the terminal end remains unconnected. The detecting device detects an active resistance (Rp) between the single terminal and one of said touch positions that is touched by a user via a return capacitance constituted (Cu) by the user and a mass element (18) coupled to the detecting device. Advantageously only a single terminal is necessary, whereas a number of touch positions can be discriminated.

An exoskeleton robot for hand and wrist kinetic rehabilitation provides passive, active-assisted, and active resistance rehabilitation for fingers and wrist joints independently. It relieves pain during exercises and stimulates the mechanoreceptors for all hand and wrist joints. The device provides levels of differentiation for finger rehabilitation through independent motion control mechanisms for all ten phalanges of the fingers and the wrist with a full range of motion, which helps in focusing the work on each joint selectively. It is portable, operates using an electric power source only, easy to wear, fits different hand sizes, and most of its parts made of lightweight plastic.

An electrical circuit in a communications channel includes a first sub-circuit having a first input which receives a composite signal that includes a transmission signal component and a receive signal component, a second input which receives a replica transmission signal, a third input which receives an analog baseline correction current, and an output which provides a receive signal which comprises the composite signal minus the replica signal. A second sub-circuit for controls the analog baseline correction current, so that the magnitude of the composite signal does not exceed a predetermined value of an operating parameter of the electrical circuit. The composite signal, the replica transmission signal, and the analog baseline correction current are directly connected together at a common node of the first sub-circuit.

The present invention relates to a system and methods for using alternating current to assess acupuncture points. Embodiments of the system of the present invention include a first probe, a second probe, a power source, a control component, a signal generator, an indicator including a gauge and display, wherein the gauge is configured to identify a relationship between active resistance and reactive resistance.